"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:71512f73-59c1-45fa-9d88-7c1dab9034fc","http://resolver.tudelft.nl/uuid:71512f73-59c1-45fa-9d88-7c1dab9034fc","Fabrieksschema ten behoeve van Prof.Dr.Ir. P.M. Heertjes: Plexiglasfabricage","Janssen, H.J.J.","","1947","Document(en) uit de collectie Procestechnologie","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:a09ca595-b0b1-4cce-ac17-2b5d95503833","http://resolver.tudelft.nl/uuid:a09ca595-b0b1-4cce-ac17-2b5d95503833","Het fabriekschema van boriumtrifluoride","Janssen, H.J.H.","","1949","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:a52db630-f129-4f4e-9ca9-e642bb43a8b6","http://resolver.tudelft.nl/uuid:a52db630-f129-4f4e-9ca9-e642bb43a8b6","Onderzoek naar het gedrag van diverse verhardingen en funderingen op de rijkswegen door Ir. F.H.J. Janssen ingenieur 1e kl. van de Rijkswaterstaat","Janssen, F.H.J.","","1952","verslag van de meetvakken, vlakheidsmetingen, betonnen wegdek.","wegverharding; wegenbouw","nl","report","Ministerie van Verkeer en Waterstaat","","","","","","","","","","","","",""
"uuid:bd05357f-2235-47bc-88bc-30ae7764a0f2","http://resolver.tudelft.nl/uuid:bd05357f-2235-47bc-88bc-30ae7764a0f2","The relation between the form of cross section the cross section, the method of revetment and the distribution of the water velocities in a waterway","Janssen, P.P.; Schijf, J.B.","TU Delft","1953","Calculation method for water movement induced by ships in canals","inland navigation; ship waves; ship induced flow; canal","en","report","PIANC","","","","","","","","","","","","",""
"uuid:5fe690d4-fab8-444d-a199-d686bf51f9e4","http://resolver.tudelft.nl/uuid:5fe690d4-fab8-444d-a199-d686bf51f9e4","Some acoustical properties of ships with respect to noise control Part 2","Janssen, J.","","1962","","construction","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:1ba8ced3-4a98-4855-a668-e3eb0159c3b2","http://resolver.tudelft.nl/uuid:1ba8ced3-4a98-4855-a668-e3eb0159c3b2","Some acoustical properties of ships with respect to noise control Part 1","Janssen, J.","","1962","","construction","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:40e6856d-611d-45b0-b289-4f796446d106","http://resolver.tudelft.nl/uuid:40e6856d-611d-45b0-b289-4f796446d106","Model experiments on sound transmission from engineroom to accomodation in motorships","Janssen, J.","","1966","","construction","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:9010ed03-7626-4efe-9882-54947f86d820","http://resolver.tudelft.nl/uuid:9010ed03-7626-4efe-9882-54947f86d820","Ftaalzuur-anhydride reactorontwerp","Janssen, F.M.","","1966","Document(en) uit de collectie Chemische Procestechnologie","","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:8a146e86-e509-43cd-86f1-06132a871961","http://resolver.tudelft.nl/uuid:8a146e86-e509-43cd-86f1-06132a871961","Kraft-, Druck- und Temperaturmessungen am Halbmodell VFW-614 (1:7) mit Strahlsimulierung im Niedergeschwindigkeitskanal (LST) des NLR","Kho, Y.G.; Wijnen, J.M.H.; Janssen, W.W.M.","","1968","Messungen sind ausgeführt an einem Hallbmodell VFW-614 um den Einfluss der Triebwerksstrahlen auf die Eigenschaften des Hohenenleitwerks mit Hohenruder zu untersuchen. Ohne und mit Strahlsimulation -wobei der heisse Strahl simuliert wurde mittels Zersetzung von H2O2, wahrend für den kalten ""By-pass""-Strahl Pressluft verwendet wurde- sind Krafte, Temperaturen und stationare und instationare Drücke und Momente am Höhenleitwerk und Hühenruder gemessen ""bei verschiedenen Kanalgeschwindigkeiten und Konfigurationen der Triehwerksstrahlen. Auch wurde hierbei der Bodeneinfluss kontrolliert. Die Ergebnisse, bei diesem Modell gefunden, zeigen im Allgemeinen, das der Einfluss der Triebwerksstrahlen nicht erschreckend ist.","","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:8eb35e2b-f375-4a88-92bf-38c23fe93db1","http://resolver.tudelft.nl/uuid:8eb35e2b-f375-4a88-92bf-38c23fe93db1","A proposal for standardized measurements and annoyance rating of simultaneous noise and vibration in ships","Janssen, J.","","1969","","construction","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:6660b938-1dfc-413e-befd-3a63977f83dc","http://resolver.tudelft.nl/uuid:6660b938-1dfc-413e-befd-3a63977f83dc","Het ontwerpen van een reaktor en de bijbehorende gasscheidingssectie voor de produktie van 18000 ton vinylacetaat per jaar","Janssen, F.J.","","1970","Document(en) uit de collectie Chemische Procestechnologie.","","nl","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:f464be07-bbfb-4899-8732-fa8a0c0fc6ea","http://resolver.tudelft.nl/uuid:f464be07-bbfb-4899-8732-fa8a0c0fc6ea","Calculation and measurement of thermal neutron spectra in non-uniform reactor lattices","Janssen, A.J.","Went, J.J. (promotor)","1971","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:303471f7-4f95-49a7-bd15-fa5ce3a76ea8","http://resolver.tudelft.nl/uuid:303471f7-4f95-49a7-bd15-fa5ce3a76ea8","Inleiding in CPS","Janssen, L.P.B.M.","","1975","Conversational Programming System (cps) is een zogenaamd ""time-sharingsysteem"".","","nl","book","Delftse Uitgevers Maatschappij","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:2767a71e-95bc-4e55-99e8-a14866373c3c","http://resolver.tudelft.nl/uuid:2767a71e-95bc-4e55-99e8-a14866373c3c","Numerical vibration analysis of the deckhouse of a far east container ship","Janssen, G.T.M.","","1976","","construction","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:3098dd5b-75cf-4ac0-a7e3-c152d5d46324","http://resolver.tudelft.nl/uuid:3098dd5b-75cf-4ac0-a7e3-c152d5d46324","A phenomenological study on twin screw extruders","Janssen, L.P.B.M.","Smith, J.M. (promotor)","1976","Although more and more twin screw extruders are being used in the polymer industry, the theoretical background is relatively undeveloped. The literature abounds in contradictions and often informs the reader that all extrusion problems can be solved if a certain new design is considered. The development of successful machines has mainly been possible through the application of commercially valuable empirical knowledge. In this research some understanding has been gained of the relevant phenomena that control the working of a counter-rotating intermeshing twin screw extruder. In these machines the two screws form more or less C shaped chambers with leakage gaps between them. The basis of the model presented in this thesis is that the extruder can be regarded as two series of chambers moved from hopper to die by the rotation of screws, while the leakage flows provide interactions between these chambers. The throughput of a twin screw extruder can be calculated with this model by subtracting the total amount of leakage from the total volume of the C shaped chambers that come free per unit time. This has been checked with model extruders fully filled with Newtonian liquids giving completely satisfactory results. For these conditions the throughput to pressure relationship, presented in terms of two new dimensionless groups, Q/2NmV and AP/Nn, can be represented by a straight line independent of viscosity and rotational speed. In order to obtain insight into the importance of the geometrical variables for the throughput to pressure relationship a sensitivity analysis has been made using computer programs based on the calculations of the leakage gaps. When using the two dimensionless numbers the characteristics are retained when the extruder is scaled up geometrically. Many quantitative articles report that twin screw extruders provide a better homogenisation on micro scale and that there is a narrower spread in residence time distributions than in single screw extruders. The experiments described in this thesis show that the dimensionless exit age distribution of a twin screw extruder can be worse than that of single screw extruders. Video recordings of tracer injections in a perspex model extruder have shown that the mixing within the chambers is also generally overestimated. The last two chapters deal with the extrusion of real polymers. The model as proposed in the first part of the thesis is extrapolated to practical situations. An explanation of the relative insensitivity of the throughput to the die pressure in a twin screw extruder when working with polymer granules is given. Experiments in which a real twin screw polymer extruder was stopped and dismantled confirm the predictions of the model that the length over which the extruder is fully filled with melt changes with die pressure. Finally it is shown quantitatively that the melting process in an intermeshing counter rotating twin screw extruder is markedly different from that in a single screw extruder.","","en","doctoral thesis","","","","","","","","","Applied Sciences","Aerodynamics & Wind Energy","","","",""
"uuid:bb3cf429-68cb-475a-92d3-99b2eb3c066c","http://resolver.tudelft.nl/uuid:bb3cf429-68cb-475a-92d3-99b2eb3c066c","Warmteoverdracht en axiale dispersie bij laminaire stroming in schroefvormig gekromde buizen","Janssen, L.","Hoogendoorn, C.J. (promotor)","1976","","","nl","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:2fba43fe-f8bd-42ac-85ee-848312d2e27e","http://resolver.tudelft.nl/uuid:2fba43fe-f8bd-42ac-85ee-848312d2e27e","Energy loss and set-up due to breaking random waves","Battjes, J.A.; Janssen, J.P.F.M.","","1978","A description is given of a model developed for the prediction of the dissipation of energy in random waves breaking on a beach. The dissipation rate per breaking wave is estimated from that in a bore of corresponding height, while the probability of occurrence of breaking waves is estimated on the basis of a wave height distribution with an upper cut-off which in shallow water is determined mainly by the local depth. A comparison with measurements of wave height decay and set-up, on a plane beach and on a beach with a bar-trough profile, indicates that the model is capable of predicting qualitatively and quantitatively all the main features of the data.","wave breaking; energy dissipation; random waves","en","conference paper","ASCE","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:a62edfa7-87e9-43db-8614-6e9dd1c31da7","http://resolver.tudelft.nl/uuid:a62edfa7-87e9-43db-8614-6e9dd1c31da7","Oriënteringsnota Ruimtelijke Ordening: Totstandkoming en inspraak: ontwikkelingen in een planningsproces","Boomgaardt, J.; Janssen, E.; Van Sante, F.; Van Veen, P.","","1978","Dit rapport bevat een beschrijving van het totstandkomen van een regeringsnota: de Oriënteringsnota. Deze nota is het eerste deel van de Derde Nota over de Ruimtelijke Ordening en bevat de beleidsvormen van de regering, die in volgende delen uitgewerkt moeten worden. Het rapport handelt over de ontwikkelingen die de aanleiding gaven voor een nieuwe nota. Vervolgens wordt een schets gegeven van werkzaamheden van de Rijksplanologische Dienst voor deze nota. Bijzondere aandacht wordt besteed aan nieuwe ontwikkelingen in de nationale ruimtelijke ordening. Zo wordt voor de Oriënteringsnota een omvangrijke inspraakprocedure ingezet, met alle organisatorische problemen van dien. In de organisatie van de Rijksplanologische Dienst worden in die periode, op procesplanning gerichte,horizontale werkverbanden ingevoerd en wordt grote nadruk op de interdepartementale koördinatie gelegd. Tevens is in deze nota voor het eerst een poging gedaan om het ruimtelijke regeringsbeleid in doelstellingen vast te leggen en als laatste en zeker niet als minst belangrijk worden pogingen ondernomen om een op uitvoering gerichte planning te ontwikkelen. De problemen, het succes en de mislukkingen van de voorbereiding van de centrale ruimtelijke planning zijn in dit rapport beschreven. Uitgave van de Vereniging voor Studie- en Studentenbelangen te Delft (VSSD).","ruimtelijke ordening","nl","book","","","","","","","","","Architecture","","","","",""
"uuid:e529cb2a-0332-43eb-a8d5-d095b2016852","http://resolver.tudelft.nl/uuid:e529cb2a-0332-43eb-a8d5-d095b2016852","Description of the KNMI Operational Wave Forecast Model GONO","Bruinsma, J.; Janssen, P.A.E.M.; Komen, G.J.; Peeck, H.H.; Saraber, M.J.M.; De Voogt, W.J.P.","TU Delft","1980","The purpose of this report is to give a description of the GONO computercode, which is operational at KNMI for many years now. The program was developed by J.W. Sanders, and its deep water version is based on a Norwegian wave prediction model. built by C. Haug in the sixties. Shallow water effects are however important in the southern part of the North Sea. giving a limitation of the wave growth and causing important swell dissipation. A discussion of the shallow water effects. as present in GONO, is given by Sanders in Ref. 3. The computer code GONO is written in ALGOL60 and operational on the Burroughs 6700 of KNMI. The program GONO calculates wind speed. wind direction and sea energy at every grid point of the GONO grid (cf. Appendix A) and swell energy at a limited number of points only (we call these points swell points). GONO runs every six hours and it gives a 12 and 24 hours forecast as well as results based on analyzed weather maps. In the winter of '79-'80 the output of GONO was compared with measurements and the operational wave model of Bracknell (United Kingdom). (The latter GONO version differs a little bit from the version here described). The preliminary results of this comparison are given in Ref. 4. A reasonable agreement of significant wave height and low-frequency energy, as given by GONO, with the observations was found. The present version of GONO, with small modifications compared to the previous version, is operational since the end of February 1980. Essentially, the GONO model is based on two steps. First. the sea energy at every grid point is determined. To this end advection of energy is treated by means of a finite difference scheme whereas the growth of the wave energy is calculated by means of an empirical growth curve (assuming that the wave spectrum has a fixed form). The second step is the calculation of the swell. Of course, in principle swell can be treated likewise, but then one has to store swell energy (and its direction) at every time, at every grid point for every frequency band. Also. this finite difference scheme is rather crude for swell propagation. whereas. because of stability reasons. there is an upper bound for the propagation speed (in the present case the upper bound is given by 13.87 m/s). If one is only interested in swell information at particular points (swell points), it is tempting to use a ray technique. The advantage of this technique is that it is very accurate. Swell is determined in this fashion in GONO.","GONO; wave forecast model; code description; computer code; wave model; wave forecasts; swell","en","report","KNMI","","","","","","","","","","","","GONO",""
"uuid:2a84088d-3c27-4d5e-9991-2b24c8038a8d","http://resolver.tudelft.nl/uuid:2a84088d-3c27-4d5e-9991-2b24c8038a8d","Brewery design","Janssen, J.; Kruyt, H.","","1982","Document(en) uit de collectie Chemische Procestechnologie.","","en","report","Delft University","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:fd6f176a-6e6a-4376-8f74-3b81bf05f01b","http://resolver.tudelft.nl/uuid:fd6f176a-6e6a-4376-8f74-3b81bf05f01b","Fysisch technologisch bij-de-handboek","Janssen, L.P.B.M.; Warmoeskerken, M.M.C.G.","","1982","De aanleiding tot het samenstellen van dit boek vormde het feit dat verschillende gegevens welke de fysisch technoloog vaak nodig heeft om 'snel' iets door te rekenen in de literatuur verspreid worden aangetroffen. Door de meest gebruikte tabellen, correlaties en grafieken te bundelen (en eventueel te herleiden tot S.I.-eenheden) is dit naslagwerk ontstaan, dat nuttig kan zijn, zowel bij het bestuderen als bij de beoefening van de Fysische Transportverschijnselen. Het boek is niet alles-omvattend; vaak moesten wij een keuze maken. Bij onze literatuurstudie is bijvoorbeeld gebleken, dat alleen voor de stofoverdracht aan deeltjes, druppels en bellen al meer dan 100 correlaties bestaan. In dergelijke gevallen hebben wij gekozen voor de meest algemene of de meest gebruikte correlaties. Dit betekent dat dit boek geen substituut is voor-een literatuurstudie. Dit tabellenboek bestaat uit vier onderdelen: Het eerste deel geeft de algemene informatie die, zoals de ervaring ons heeft geleerd, vaak nodig of handig is; variërend van Grieks alfabet tot ijkkurven van thermokoppels en omslaggebieden van indicatoren. Het tweede deel is een uittreksel uit de veel gebruikte wiskunde en omvat naast algemene wiskundige technieken ook de vector- en tensorrekening voorzover deze relevant is voor de stromingsleer en elementaire reologie. Deel drie vormt een compendium van de Fysische Technologie. Bij het samenstellen hiervan hebben wij gepoogd door systematische indeling snel opzoeken mogelijk te maken. Tevens hebben wij de grafieken zodanig uitgevoerd, dat zij nauwkeurig kunnen worden afgelezen. Tenslotte hebben wij in deel vier stofeigenschappen van verschillende materialen getabelleerd. Hierbij is speciale aandacht geschonken aan de twee meest gebruikte stoffen: water en lucht. Wij hopen dat dit boek nuttig zal zijn, zowel voor de studenten in, als voor de beoefenaren van de fysische technologie; wij houden ons aanbevolen voor suggesties, opmerkingen en aanvullingen.","","nl","book","Delftse Uitgevers Maatschappij","","","","","","","","Applied Sciences","","","","",""
"uuid:8ee5259c-9e97-4f96-8071-b1758f20122b","http://resolver.tudelft.nl/uuid:8ee5259c-9e97-4f96-8071-b1758f20122b","GONO, a coupled hybrid wave prediction model","Janssen, Peter A.E.M.","","1983","","hydrodynamics","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:fabcd3f0-c130-452d-ba47-27d82e1b2f6f","http://resolver.tudelft.nl/uuid:fabcd3f0-c130-452d-ba47-27d82e1b2f6f","Energiemanagement aan boord van schepen","de Haas, R.S.; Dekkers, M.; Janssen, M.C.W.M.; Snit, M.G.","","1984","","energiemanagement; energieverbruik; analyse","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:cb13a4fa-b9f9-481b-b0e4-3c1551e4933b","http://resolver.tudelft.nl/uuid:cb13a4fa-b9f9-481b-b0e4-3c1551e4933b","DOSCON 1 en 2, methoden voor bet genereren van scheepsconceptontwerpen","Janssen, M.C.W.M.","","1986","","","","other","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:fb4b4bea-2f06-4d68-bb9e-59e46b6599f8","http://resolver.tudelft.nl/uuid:fb4b4bea-2f06-4d68-bb9e-59e46b6599f8","A study of the feasibility of using sea and wind information from the ERS-1 satellite. Part 2: Use of Scatterometer and altimeter data in wave modelling and assimilation","Janssen, P.A.E.M.","","1987","","hydrodynamics","","book","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:f63e1146-5efb-4e64-8ba9-c2e3f20f1dce","http://resolver.tudelft.nl/uuid:f63e1146-5efb-4e64-8ba9-c2e3f20f1dce","PROVIT, programma voor de vergelijking van integrale transportketens","Janssen, M.C.W.M.","Dijkshoorn, N. (mentor)","1987","","student thesis","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:e01e8eb1-44b8-48b1-88a8-41d66eee9af2","http://resolver.tudelft.nl/uuid:e01e8eb1-44b8-48b1-88a8-41d66eee9af2","PROVIT, programma voor de vergelijking van integrale transportketens","Janssen, M.C.W.M.","","1987","","","","other","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:0e279714-5347-4e32-8c84-e29e86644532","http://resolver.tudelft.nl/uuid:0e279714-5347-4e32-8c84-e29e86644532","Reactions of nitrogen oxides in power-plant plumes: Models and measurements","Janssen, L.H.J.M.","Donze, M. (promotor); Nieuwstadt, F.T.M. (promotor)","1988","","","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:65b9aec4-5dda-4bac-8cb8-e3750a01272b","http://resolver.tudelft.nl/uuid:65b9aec4-5dda-4bac-8cb8-e3750a01272b","Aanpak Moerwijk: Vernieuwing van een na-oorlogse wijk","Janssen, K.; Van der Laag, B.; Moscoviter, A.","","1989","Moerwijk is de eerste wijk die na de oorlog in Den Haag is gebouwd. Zoals in vele wijken uit deze periode verouderen de woningen en voldoet de stedebouwkundige structuur niet meer aan de hedendaagse wensen. Bewoners vinden dat de wijk achteruit gaat en actief beheer lijkt noodzakelijk om verval te voorkomen. Deze werkuitgave behandelt een wijze van aanpakken die een nieuwe impuls voor deze verouderende wijk kan zijn. Door de problemen te analyseren, de kwaliteiten te erkennen en deze te plaatsen in huidige en toekomstige ontwikkelingen wordt een plan-van-aanpak ontwikkeld dat deze na-oorlogse wijk weer toekomst moet bieden. 'Aanpak Moerwijk' is de derde werkuitgave in de reeks 'Integrale Stadsvernieuwing'. Problemen in de steden worden tegenwoordig gekenmerkt door een groeiende complexiteit. De traditionele, beleidssectoren kunnen steeds minder vaak hiervoor een oplossing aandragen. Voor een integrale benadering zijn noch instrumenten, noch organisatievormen ontwikkeld. De serie 'Integrale Stadsvernieuwing' stelt strategieën en analysen ter discussie, die kunnen leiden tot een bredere aanpak van de stedelijke problemen. Deze reeks is niet alleen bedoeld voor hen die zich beroepsmatig bezighouden met stadsvernieuwing, hetzij vanuit een wetenschappelijke belangstelling, dan wel in verband met hun praktijk op het gebied van beleidsvoorbereiding, planvorming en uitvoering. Ook de betrokkenen en belanghebbenden bij het stadsvernieuwingsproces kunnen door middel van deze reeks hun inzicht in de problemen en perspectieven van de stedelijke vernieuwing verdiepen.","stadsvernieuwing; Nederland; Moerwijk ('s-Gravenhage)","nl","book","Delftse Universitaire Pers","","","","","","","","Architecture","","","","",""
"uuid:06286ecc-9cf3-466f-a635-8e4476276291","http://resolver.tudelft.nl/uuid:06286ecc-9cf3-466f-a635-8e4476276291","One-dimensional subband effects in the conductance of multiple quantum wires in Si metal-oxide-semiconductor field-effect transistors","Gao, J.R.; de Graaf, C.; Caro, J.; Radelaar, S.; Offenberg, M.; Lauer, V.; Singleton, J.; Janssen, T.J.B.M.; Perenboom, J.A.A.J.","","1990","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:eadb1440-ea27-4296-960a-14aa52ecfe36","http://resolver.tudelft.nl/uuid:eadb1440-ea27-4296-960a-14aa52ecfe36","Quantum size effects and grain-boundary scattering in polycrystalline cobalt disilicide films","van der Kraan, R.G.P.; Jongste, J.F.; Jaeger, H.M.; Janssen, G.C.A.M.; Radelaar, S.","","1991","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:83ecaad7-aacd-4a8a-9d77-23814ed1a9e7","http://resolver.tudelft.nl/uuid:83ecaad7-aacd-4a8a-9d77-23814ed1a9e7","CO2-verwijdering uit afgas","Bartels, E.J.; Ten Böhmer, C.; Effendi, A.; Hoogerwerf, I.; Janssen, P.; Lahr, F.; Peutz, M.; Reichrath, R.; Rooijmans, A.; Soetjahjo, J.; Tummers, R.","","1991","Document uit de collectie Chemische Procestechnologie","","en","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:a69a4994-49d4-4694-aa32-937a9a7896a5","http://resolver.tudelft.nl/uuid:a69a4994-49d4-4694-aa32-937a9a7896a5","Modelling storm surges and forecast effects in designing the Rotterdam storm surge barrier","Janssen, J.P.F.M.; Jorissen, R.E.","Rijkswaterstaat","1991","In 1989 the Dutch government decided to build a storm surge barrier in the New Waterway near Rotterdam being a good and cheap alternative for the necessary strengthening of dikes along the lower regions of the Dutch rivers Rhine and Meuse. To be feasible the barrier had to meet several goals. The most important ones being : * closing frequency less then once every 10 years now and once every 5 years after 50 years from now (including 25 cm sea-level rise) * prescribed reduction of design water-levels at two representative locations, being Rotterdam and Dordrecht. These and other parameters are calculated by means of a probabilistic calculation method. This method involves a mathematical open-channel network model of which the results are combined with the statistical properties of input parameters. A risk-analysis of the performance of the barrier is included. Finally the model is adapted to study operational aspects.","storm surge; storm forecast; storm surge barrier","en","report","Unesco","","","","","","","","","","","","",""
"uuid:f5446eb8-d367-41fc-81fa-2083d01a22a7","http://resolver.tudelft.nl/uuid:f5446eb8-d367-41fc-81fa-2083d01a22a7","Levende Rivieren","Helmer, W.; Litjes, G.; Overmars, W.; Barneveld, H.; Klink, A.; Sterrenburg, H.; Janssen, B.","WL Delft; Stroming bv; Bureau Klink; Bureau Meet","1992","Hoe om te gaan met de Nederlandse riveren op een zodanige manier dat de natuur bevorderd wordt.","environment; rivers","nl","report","Wereld Natuurfonds","","","","","","","","","","","","",""
"uuid:3b75c367-3a15-4510-9f82-1045df55a62f","http://resolver.tudelft.nl/uuid:3b75c367-3a15-4510-9f82-1045df55a62f","Encapsulation and membrane formation by interfacial polycondensation","Janssen, L.J.J.M.","Posthuma de Boer, A. (promotor)","1992","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:e5586b6f-15d8-43f5-ae18-bcd3e07ece61","http://resolver.tudelft.nl/uuid:e5586b6f-15d8-43f5-ae18-bcd3e07ece61","Een overzicht van hangbanen (summary)","Janssen, P.P.","","1993","","","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:fccf2f69-2107-44bb-8804-65cee6361692","http://resolver.tudelft.nl/uuid:fccf2f69-2107-44bb-8804-65cee6361692","Een programma voor het roosteren van een nachtdienst-rooster voor medische specialisten","Janssen, P.P.","","1993","","Computer assignment","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:d93bcc47-7d5f-404e-b8f2-730913c31215","http://resolver.tudelft.nl/uuid:d93bcc47-7d5f-404e-b8f2-730913c31215","Een overzicht van hangbanen","Janssen, P.P.","","1993","","","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:9af9bb7c-e181-47ec-ac95-138f1b3fb7f1","http://resolver.tudelft.nl/uuid:9af9bb7c-e181-47ec-ac95-138f1b3fb7f1","Een overzicht van hangbanen (summary)","Janssen, P.P.","","1993","","","","report","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:d45f7fb2-3c3f-48db-be8f-2e7226e60b1f","http://resolver.tudelft.nl/uuid:d45f7fb2-3c3f-48db-be8f-2e7226e60b1f","A METHOD OF APPLYING MOLECULAR SIEVE CRYSTALS TO A SUPPORT, AND A LOADED SUPPORT THUS OBTAINED","Janssen, J.C.; Van Bekkum, H.","","1993","Abstract of WO 9300155 (A1) A method of applying molecular sieve crystals to a support, wherein the surface of the support is brought into oxidic condition, whereafter the support is contacted with a solution of the molecular sieve-forming compound or compounds or precursors thereof, whereafter crystallization on the surface is effected.","","en","patent","European Patent Office","","","","","","","","","","","","",""
"uuid:58637727-dc7f-4050-86d3-d1d552c91154","http://resolver.tudelft.nl/uuid:58637727-dc7f-4050-86d3-d1d552c91154","Uitbreiding van het CTS containerterminal simulatiemodel van ECT (summary)","Janssen, P.P.","","1994","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:c2584858-a3ea-4100-86fd-3e82f654875a","http://resolver.tudelft.nl/uuid:c2584858-a3ea-4100-86fd-3e82f654875a","Uitbreiding van het CTS containerterminal simulatiemodel van ECT (summary)","Janssen, P.P.","","1994","","","","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:988eaf2e-88ca-4a19-a3f5-4f4dd7c3485d","http://resolver.tudelft.nl/uuid:988eaf2e-88ca-4a19-a3f5-4f4dd7c3485d","Uitbreiding van het CTS containerterminal simulatiemodel van ECT","Janssen, P.P.","","1994","","","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:a13dc9da-a2c0-42ef-8ce6-a9bcdc1c1bdc","http://resolver.tudelft.nl/uuid:a13dc9da-a2c0-42ef-8ce6-a9bcdc1c1bdc","Instabilities in natural-convection flows in cavities","Janssen, R.J.A.","Hoogendoorn, C.J. (promotor)","1994","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:bad71590-ef83-45ee-831f-2ced95c5f911","http://resolver.tudelft.nl/uuid:bad71590-ef83-45ee-831f-2ced95c5f911","Acoustoelastic stress evaluationin metal plate using absolute shear and longitudinal time-of-flight data","Janssen, M.","Bakker, A. (promotor)","1994","","Acoustoelasticity; stress evaluation; ultrasonics","en","doctoral thesis","Delft University Press","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"uuid:a7275bc5-566f-4121-b6ef-9c898b578fef","http://resolver.tudelft.nl/uuid:a7275bc5-566f-4121-b6ef-9c898b578fef","Sand transport in oscillatory sheet-flow; a literature review","Janssen, C.M.","","1995","This literature review is part of the ongoing research on sand transport in oscillatory sheet-flow, as taking place at the coast during storms. Because sheet-flow corresponds to conditions of high shear stress, large amounts of sand are transported. Therefore it is an important part of the total sand transport (sheet-flow and suspended load). Sand transport is a very important phenomenon in almost all coastal engineering problems. When a harbour is to be developed it is important to know how much sand is transported and in what direction, in order to prevent sedimentation problems in the entrance channel or in the harbour itself. Another example deals with coastal defence measures to prevent erosion of a beach. Either the use of coastal structures, like breakwaters, groynes etc., or a beach nourishment scheme requires information about the magnitude and direction of the general and local sand transport. Unlike the sand transport in rivers, which can be assumed to occur in a merely one- dimensional, steady uniform flow, the sand transport at the coast is the result of a complex interaction of steady currents and a wave-induced unsteady oscillatory flow at an arbitrary angle to the current. In order to predict the resulting sand transport, many different models have been developed. The aim of this literature study is to present an overview of the models, that predict the unsteady sand transport in sheet-flow conditions. Some of the models are specifically derived for sand transport under sheet-flow conditions, while others have a more general basis. A comparison is made between the capability of the different existing models in predicting the sand transport in sheet-flow conditions. Moreover also the different experimental studies on sand transport in oscillatory flow are presented. As a result of the comparison the most encouraging direction for the ongoing research is determined.","sediment transport; waves","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:06011369-f065-4189-8014-b4975df84545","http://resolver.tudelft.nl/uuid:06011369-f065-4189-8014-b4975df84545","Slingerbeweging als gevolg van instromend water, berekeningen en metingen aan Ferry-72","Vredeveldt, A.W.; Uwland, J.J.; Janssen, G.T.M.","","1995","","construction; Ferry; RoRo; slingerbeweging; instromend water","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:8829ec82-54a4-43ad-8a98-429e57be0bc9","http://resolver.tudelft.nl/uuid:8829ec82-54a4-43ad-8a98-429e57be0bc9","The application of model-based image processing to the interpretation of maps; De toepassing van modelgestuurde beeldbewerking op interpretatie van kaarten","Janssen, D.T.","Young, I.T. (promotor)","1995","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:3729e3e5-b96f-4929-9701-619fd7795391","http://resolver.tudelft.nl/uuid:3729e3e5-b96f-4929-9701-619fd7795391","De produktie van propeenoxide","Groot, Y.J.M.; Janssen, R.J.M.; Storm, A.H.R.; Visser, S.B.","","1995","","propeenoxide; waterstofperoxide; anthraquinone; titanium-silicaliet-1; autoxidation","nl","report","Delft University of Technology","","","","","","","","Applied Sciences","DelftChemTech","","","",""
"uuid:ba4efb22-747c-4ef1-b777-cdf4baa95611","http://resolver.tudelft.nl/uuid:ba4efb22-747c-4ef1-b777-cdf4baa95611","Construction of Orthogonal Polynomials Associated with Time Series and Random Fields; Constructie van Orthogonale Polynomen Geassocieerd met Tijdreeksen en Stochastische Velden","Janssen, R.H.P.","Scheffer, C.L. (promotor)","1995","","","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:799f7988-1a4c-487a-a5d3-39ab4c87c7be","http://resolver.tudelft.nl/uuid:799f7988-1a4c-487a-a5d3-39ab4c87c7be","Wideband indoor channel measurements and BER analysis of frequency selective multipath channels at 2.4, 4.75, and 11.5 GHz","Janssen, G.J.M.; Stigter, P.A.; Prasad, R.","","1996","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:42bc0d01-93d9-4b70-8b87-ae808ce95cc5","http://resolver.tudelft.nl/uuid:42bc0d01-93d9-4b70-8b87-ae808ce95cc5","Pyruvate Decarboxylase: An Indispensable Enzyme for Growth of Saccharomyces cerevisiae on Glucose","Flikweert, M.T.; van der Zanden, L.; Janssen, W.M.Th.M.; Steensma, H.Y.; van Dijken, J.P.; Pronk, J.T.","","1996","","pyruvate decarboxylase; sugar metabolism; Succharomyces cerevisiae; metabolic compartmentation; acetyl-CoA","en","journal article","Wiley","","","","","","","","","","","","",""
"uuid:40be8d24-8d1f-4796-8f43-f439c73eb620","http://resolver.tudelft.nl/uuid:40be8d24-8d1f-4796-8f43-f439c73eb620","METHOD FOR CLEAINING A HOLE","Janssen, G.C.A.","","1997","Abstract of WO 9749122 (A1) Method for making a conducting connection between two spaced metallic layers situated in a semiconductor substrate. After a hole, a so-called via, has been made by etching, tungsten or aluminium is introduced into the hole by conventional techniques, such as CVD or force filling. In order to provide optimum connection to the bottom metallic layer of the hole, it is necessary to clean the latter. It is proposed that this cleaning should be carried out with germane-containing gas.","","en","patent","European Patent Office","","","","","","","","","","","","",""
"uuid:5f132336-4432-47c5-9ab4-217551fa0cd4","http://resolver.tudelft.nl/uuid:5f132336-4432-47c5-9ab4-217551fa0cd4","Evaluation of the calculable high frequency AC-DC standard","Van Mullem, C.; Janssen, W.J.G.D.; De Vreede, J.P.M.","","1997","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:4e4866f2-a0ec-4dcc-9a4b-fc827e486517","http://resolver.tudelft.nl/uuid:4e4866f2-a0ec-4dcc-9a4b-fc827e486517","Process for the purification of gases containing hydrogen sulfide","Buisman, C.J.N.; Sorokin, D.Y.; Kuenen, J.G.; Janssen, J.H.; Robertson, L.A.","","1997","","hydrogen sulfide removal gas bacteria","en","patent","","","","","","","","","","","","","",""
"uuid:d20b3fdc-efdf-4d05-b7bc-f8eb01ac6bc7","http://resolver.tudelft.nl/uuid:d20b3fdc-efdf-4d05-b7bc-f8eb01ac6bc7","Gewichts- en zwaartepuntsschating van de impuls, gebaseerd op issue C","Janssen, T.; Melkert, J.A.","","1997","","","nl","report","Delft University of Technology","","","","","","","","Aerospace Engineering","","","","",""
"uuid:ac6ea2e7-efbd-44f5-9e85-c8caa2baca09","http://resolver.tudelft.nl/uuid:ac6ea2e7-efbd-44f5-9e85-c8caa2baca09","Modellering drijfwerk dieselmotor","Hermans, H.M.E.; Janssen, S.","","1997","","","","other","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:10eda855-dd7d-4c23-b830-98921b5840c3","http://resolver.tudelft.nl/uuid:10eda855-dd7d-4c23-b830-98921b5840c3","Intertidal beach level estimations from video images","Janssen, P.C.","","1997","","monitoring; monitoring; videowaarneming; video monitoring; strandprofiel; beach profile; strandmorfologie; beach morphology; intergetijdegebieden; intertidal areas","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:406e0328-619e-4c5d-8c12-a22756d68cca","http://resolver.tudelft.nl/uuid:406e0328-619e-4c5d-8c12-a22756d68cca","Sediment transport for two sands with different grain diameters under combined wave-current sheet flow conditions, part I: Data report","Janssen, C.M.; Hout, G. van der","","1997","","zandtransport; sand transport; korrelgrootte; grain size; stroming door golven; wave induced flow","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:27b13b34-f6b7-4006-a874-d369511e1c26","http://resolver.tudelft.nl/uuid:27b13b34-f6b7-4006-a874-d369511e1c26","Robust receivers for adverse radio channels","Janssen, G.J.M.","Arnbak, J.C. (promotor)","1998","","","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:fbc25006-a20e-4318-a46b-d97dc2074933","http://resolver.tudelft.nl/uuid:fbc25006-a20e-4318-a46b-d97dc2074933","Research in materials science and technology; annual report 1997","Janssen, M.","","1998","","materials science; materials technology","en","book","Delft University Press","","","","","","","","Mechanical, Maritime and Materials Engineering","","","","",""
"uuid:8127ed91-2820-465f-8679-b2ef50f52fc9","http://resolver.tudelft.nl/uuid:8127ed91-2820-465f-8679-b2ef50f52fc9","Modulation system for radio communications transmission","Moretti, M.; Janssen, G.J.M.","","1999","Abstract of NL 1007132 (C1) The null points of the filter transfer function (h(t)) are identical to the null points of the base frequency of the modulation signal","","en","patent","European Patent Office","","","","","","","","","","","","",""
"uuid:139a1746-98e3-421c-a513-34cd6e8b644a","http://resolver.tudelft.nl/uuid:139a1746-98e3-421c-a513-34cd6e8b644a","Maximum-density droplet and charge redistributions in quantum dots at high magnetic fields","Oosterkamp, T.H.; Janssen, J.W.; Kouwenhoven, L.P.; Austing, D.G.; Honda, T.; Tarucha, S.","","1999","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:b082eea4-468d-401d-a4f1-f6be41d5fce9","http://resolver.tudelft.nl/uuid:b082eea4-468d-401d-a4f1-f6be41d5fce9","Research in materials science and technology; annual report 1998","Janssen, M.","","1999","","materials science; materials technology","en","book","Delft University Press","","","","","","","","Mechanical, Maritime and Materials Engineering","","","","",""
"uuid:7517be9e-1c90-476e-940e-4ff9a5d86305","http://resolver.tudelft.nl/uuid:7517be9e-1c90-476e-940e-4ff9a5d86305","Spatially resolved scanning tunneling spectroscopy on single-walled carbon nanotubes","Venema, L.C.; Janssen, J.W.; Buitelaar, M.R.; Wildoer, J.W.G.; Lemay, S.G.; Kouwenhoven, L.P.; Dekker, C.","","2000","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:460d5bad-aaa5-4956-8896-b987e5950326","http://resolver.tudelft.nl/uuid:460d5bad-aaa5-4956-8896-b987e5950326","An integrated design and production concept for ship propellers","van Beek, T.; Janssen, A.","","2000","","resistance & propulsion","","conference paper","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:44268a78-042c-4ea1-a3d5-9c7261609715","http://resolver.tudelft.nl/uuid:44268a78-042c-4ea1-a3d5-9c7261609715","Herstel van estuariene gradienten in het Waddengebied: Een onderbouwing van de ecologische meerwaarde van dit herstel en een eerste aanzet tot uitwerking","Janssen, G.M.","Rijkswaterstaat","2000","Het beleidsmatige streven om te komen tot herstel van estuariene gradiënten in het Waddengebied vindt wetenschappelijke ondersteuning in de verwachting dat dit een ecologische meerwaarde betekent van de huidige situatie. Deze ecologische meerwaarde uit zich in een toename van de habitatdiversiteit in de vorm van een uitbreiding van het brakwaterareaal, en betekent een versterking van de natuurwaarde van het Waddengebied. De mogelijkheden tot herstel en daarmee ook de realisatie van de meerwaarde is overigens afhankelijk van de locatie. Het ultieme streven vanuit het oogpunt van ecologisch herstel naar een open verbinding tussen zoet en zout water met getijdeinvloed kan in een situatie zoals bij de Westerwoldse Aa in belangrijke mate worden gerealiseerd. In veel beperktere mate is herstel mogelijk bij de situaties van zout-zoet-wisselingen bij uitwateringssituaties zoals bijvoorbeeld bij Roptazijl, waar in eerste instantie slechts het deelaspect van vismigratie kan worden aangepakt. Door het bestuderen van herstelprojecten die reeds zijn uitgevoerd, zoals de ontpoldering van de voormalige 3e en 4e polder van de Kroons Polders op Vlieland, is inzicht te verkrijgen in de haalbaarheid en meerwaarde van herstelprojecten. De locatie Afsluitdijk is door de grote omvang een geval apart. Volgens Janssen en Bartelds (1999) bieden de grote hoeveelheden zoetwater en de nog bestaande morfologische structuren goede mogelijkheden tot herstel van een estuariene gradiënt juist in dit gebied van de Waddenzee. Hoewel het geheel of gedeeltelijk slechten van de Afsluitdijk als barrière tussen zoet en zout in ecologisch opzicht de meest na te streven situatie is, was de opdracht van het onderzoek dat in dit rapport wordt beschreven om uitsluitend te kijken naar herstel van de estuariene gradiënt aan de Waddenzee-zijde van de Afsluitdijk. Op basis van argumenten afkomstig uit het onderzoek naar visziekten, vismigratie, biodiversiteit, de modellering van de gevolgen op de saliniteit van alternatieve spuilocaties en spuihoeveelheden, lijkt een herstel van één of meer aspecten van estuariene gradiënten in het Afsluitdijkgebied mogelijk. Het merendeel van het IJsselmeerwater zou daartoe moeten worden gespuid via de sluizen bij Kornwerderzand. Bij Den Oever én bij Kornwerderzand zouden de spuikokers vooral s nachts, wanneer vissen het meest actief zijn, zoveel mogelijk moeten worden geheven tot 50 cm. hoogte ten behoeve van de vismigratie. Het spuien van water moet tenslotte vooral overdag plaatsvinden via zoveel mogelijk spuikokers. Hierbij verdient het aanbeveling om meer variatie in het peil van het IJsselmeer toe te staan. In een nadere locatie-gerichte studie zouden de gevolgen voor andere, chemische, fysische en biologische gradiënten, moeten worden onderzocht. Een belangrijk punt hierbij is of de bestaande morfologische gesteldheid, de sedimentatie en erosieprocessen die mede leiden tot kweldervorming, passend zijn bij een nieuw groter brakwaterareaal nabij Kornwerderzand. Tenslotte is van groot belang of herstel van estuariene gradiënten naast een ecologische meerwaarde ook van maatschappelijke, sociaal-economische betekenis kan zijn. Deze aspecten verdienen in de komende jaren in een bredere discussie aandacht. Het is belangrijk zich te realiseren dat aanvoer van zoetwater voor herstel van estuariene gradienten essentieel is. Daarmee is het Waddengebied ook een water-vragende partij geworden en zal moeten worden meegewogen in zoetwaterhuishoudkundig beheer. Kennisontwikkeling moet voortvarend ter hand worden genomen om uiteindelijk tot verantwoorde adviezen te kunnen komen. De hoofdvraag voor de komende jaren is: welke tijd-ruimte aspecten zijn relevant voor (het herstel van) brakwater intergetijde gebied? hoeveel zoetwater is er per tijd en ruimte nodig ter optimalisatie van een estuariene gradiënt welke andere ( morfologische, chemische en biologische ) parameters zijn voor herstel relevant","ecologie; Waddengebied; herstel; Afsluitdijk; spuien; estuariene gradienten; vismigratie","nl","report","Rijkswaterstaat, RIKZ","","","","","","","","","","","","OVERGANG",""
"uuid:e45067e1-a6f0-46d0-b017-91c6eafc213e","http://resolver.tudelft.nl/uuid:e45067e1-a6f0-46d0-b017-91c6eafc213e","Transmission modulation system for mobile phone reduces battery consumption without increasing bit error rate","Moretti, M.; Janssen, G.J.M.","","2000","The transmission modulation system minimizes the wasted 'out of band' power. The digital data (1) to be transmitted is fed via a pulse response filter (2) to a mixer (4) where it modulates a carrier wave (4). The digital data is also fed via a delay circuit (5) and identical filter (6) to a second mixer (7). The delayed signal modulates a carrier (8) which is 90 degrees out of phase with the first (4). The modulated signals are summed (9) and transmitted.","","en","patent","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:8de59992-582c-4ea2-847f-1ef50b1e09c7","http://resolver.tudelft.nl/uuid:8de59992-582c-4ea2-847f-1ef50b1e09c7","Characterisation of oil-water mixtures produced in high-watercut oil wells; Karakterisering van olie-water mengsels geproduceerd in olieputten met een hoog watergehalte","Janssen, P.H.","Currie, P.K. (promotor)","2000","","","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:e1f9cc1f-091d-4aeb-bb8c-a0304909838d","http://resolver.tudelft.nl/uuid:e1f9cc1f-091d-4aeb-bb8c-a0304909838d","Comparison of different rig configurations for an open 60 – Introduction of a rig design method usable for all types of rig configurations","Janssen, R.J.","","2001","","yachting","","master thesis","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:c749a6c0-d4cf-4c29-8dcc-7c096f7132da","http://resolver.tudelft.nl/uuid:c749a6c0-d4cf-4c29-8dcc-7c096f7132da","Testing regulations and procedures for environmental auditing of recycled aggregates","Hendriks, Ch.F.; Janssen, G.M.T.","","2001","","quality certification; testing; environmental conditions","en","journal article","Delft University of Technology","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:620b83ff-c4f7-4db9-832e-d2616d895cca","http://resolver.tudelft.nl/uuid:620b83ff-c4f7-4db9-832e-d2616d895cca","Analysis of low frequency waves at Petten","Dongeren, A.R. van; Janssen, T.T.","","2001","","windgolven; wind waves; randgolven; edge waves","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:87f7f6c5-9817-47dc-b0cf-8bc68f4716b7","http://resolver.tudelft.nl/uuid:87f7f6c5-9817-47dc-b0cf-8bc68f4716b7","Application of construction and demolition waste","Hendriks, Ch.F.; Janssen, G.M.T.","","2001","","reuse of concrete; reuse of mixed concrete and masonry; recycled aggregates in roads; recycled aggregates in concrete; reuse of asphalt","en","journal article","Delft University of Technology","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:a0b878ec-8317-447b-9b9b-74a4a07e8581","http://resolver.tudelft.nl/uuid:a0b878ec-8317-447b-9b9b-74a4a07e8581","Construction and demolition waste: General process aspects","Hendriks, Ch.F.; Janssen, G.M.T.","","2001","","recycling options; demolition; seperation of waste","en","journal article","Delft University of Technology","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:86eca650-6507-4447-87d7-4d9538b4d335","http://resolver.tudelft.nl/uuid:86eca650-6507-4447-87d7-4d9538b4d335","Fatigue tests on large scale knuckle specimens","Dijkstra, O.D.; Janssen, G.T.M.; Ludolphy, J.W.L.","","2001","","offshore","","conference paper","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:6f4aaf07-47b6-485c-b2b9-4a02df71a7a5","http://resolver.tudelft.nl/uuid:6f4aaf07-47b6-485c-b2b9-4a02df71a7a5","Compiler Strategies for Transport Triggered Architectures","Janssen, J.","Van de Goor, A.J. (promotor); Corporaal, H. (promotor)","2001","Compiler technology plays an important role to enhance the performance of modern microprocessors. In this thesis, compiler techniques and strategies are described to enhance the performance of microprocessors based on the Transport Triggered Architecture. The interaction between two important phases in a compiler, instruction scheduling and register assignment is described. Analysis and experiments show that considering these two phases separately has major performance drawbacks. A new technique, integrated assignment, is introduced which integrates instruction scheduling and register assignment in a single phase. The presented experiments clearly demonstrate the benefit of this approach for various scheduling scopes. Another topic addressed in this thesis is the complexity of the register file. It is shown that a partitioning of the register file results in a reduced chip area, a smaller access time and lower power dissipation at the expense of only a very small cycle count increase. This solves the register file problem within future high-end microprocessors.","compilers; instruction scheduling; register assignment","en","doctoral thesis","Delft University Press","","","","","","","","Information Systems and Technology","","","","",""
"uuid:066fec4c-5b7d-466f-bca1-7ea64b4ace15","http://resolver.tudelft.nl/uuid:066fec4c-5b7d-466f-bca1-7ea64b4ace15","Designing electronic intermediaries: An agent-based approach for designing interorganizational coordination mechanisms","Janssen, M.F.W.H.A.","Sol, H.G. (promotor)","2001","","Business engineering; agent-based simulation; coordination; information and management; electronic intermediation; decision support","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:2695d52f-d093-44bd-9415-6f9604faab88","http://resolver.tudelft.nl/uuid:2695d52f-d093-44bd-9415-6f9604faab88","Spatially resolved spectroscopy on carbon nanotubes","Janssen, J.W.","Dekker, C. (promotor); Kouwenhoven, L.P. (promotor)","2001","Carbon nanotubes are small cylindrical molecules with a typical diameter of 1 nm and lengths of up to micrometers. These intriguing molecules exhibit, depending on the exact atomic structure, either semiconducting or metallic behavior. This makes them ideal candidates for possible future molecular electronics. In this thesis Janssen describes measurements on carbon nanotubes with a scanning tunnelling microscope. This instrument can measure both the atomic structure and electronic structure. The effect on the electronic structure of a kink in a nanotube, crossings of nanotubes, and the end of a nanotube is studied. Carbon nanotubes are also ideal systems to study quantization phenomena in one dimension. By cutting a nanotube to a short length the texbook particle-in-a-box model is experimentally realized. The wave functions of the electrons are made visible and the measured patterns correspond well to theoretical results. The spatial structure of the wave functions shows interference patterns which are exploited to obtain a value for an important electronic property, the Fermi velocity.","carbon nanotubes; scanning tunneling microscopy; nanotechnology","en","doctoral thesis","Delft University Press","","","","","","","","Applied Sciences","","","","",""
"uuid:065fc786-c8e9-4295-92b9-225dac817352","http://resolver.tudelft.nl/uuid:065fc786-c8e9-4295-92b9-225dac817352","Structure and shear in a cohesive powder","Janssen, R.J.M.","Scarlett, B. (promotor)","2001","Handling of powders and granular materials is of great importance to industry. However, the knowledge of many powder related processes in industry is poor. In this work, the flow behaviour of powder has been investigated with an advanced tester: the Flexible Wall Biaxial Tester. Flow of powder occurs via the formation of shear planes. For non-cohesive materials one assumes a width of such a shear plane of 10 particle diameters. In this work the Neutron Depolarization technique has been used to investigate the shear region on a microscopic scale. This technique gives direct information of the rotation of the individual particles in the shear region. It appeared that the width of the shear region in cohesive BCR-limestone is much wider than 10 particle diameters. The assumption that the shear region in direct shear testers is a flat plane is incorrect. With the Flexible Wall Biaxial Tester a number of experiments have been performed in order to understand the fundamental flow behaviour of cohesive powder. It has been shown that the flow function is not independent of the intermediate principal stress as is usually assumed. Also anisotropy has a large influence on the behaviour of powder and the measured anisotropic flow function is lower than the regular flow function. These results cannot be explained by the current theory. The reason for these findings is that the particles in the powder form structures that determine the macroscopic behaviour of the powder. This structure is a missing parameter in the current theory. The definition of a structure parameter makes the design of powder with chosen properties possible.","shear; cohesive powder","en","doctoral thesis","Delft University Press","","","","","","","","Applied Sciences","","","","",""
"uuid:e6679370-a781-4f9d-98ec-2be2874c776d","http://resolver.tudelft.nl/uuid:e6679370-a781-4f9d-98ec-2be2874c776d","Structure and shear in a cohesive powder","Janssen, R.J.M.","Scarlett, B. (promotor)","2001","","","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:5b468ded-1211-4021-827e-e01247075963","http://resolver.tudelft.nl/uuid:5b468ded-1211-4021-827e-e01247075963","Scanning tunneling spectroscopy on crossed carbon nanotubes","Janssen, J.W.; Lemay, S.G.; Kouwenhoven, L.P.; Dekker, C.","","2002","","","en","journal article","American Physical Society","","","","","","","","","","","","",""
"uuid:63b03814-ff40-4a13-90e7-e1d46c06f31e","http://resolver.tudelft.nl/uuid:63b03814-ff40-4a13-90e7-e1d46c06f31e","Symbol error probability analysis of a multiuser detector for M-PSK signals based on successive cancellation","Janssen, G.J.M.; Ben Slimane, S.","","2002","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:1d9fc01e-160d-45f0-a98f-7de0c9712341","http://resolver.tudelft.nl/uuid:1d9fc01e-160d-45f0-a98f-7de0c9712341","Fracture Mechanics: 2nd Edition","Janssen, M.; Zuidema, J.; Wanhill, R.J.H.","","2002","","Fracture mechanics","en","book","Delft Academic Press / VSSD","978-90-407-2221-9","","","","","","","Delft University of Technology","","","","",""
"uuid:f25f7874-8fce-4072-af06-672d2e1f7262","http://resolver.tudelft.nl/uuid:f25f7874-8fce-4072-af06-672d2e1f7262","GO project MT111, het ontwerp van een snelpatrouille vaartuig"" JSR 53","Janssen, R.","","2002","","","","other","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:eeeb0728-e17e-4a46-9f21-282a671417f6","http://resolver.tudelft.nl/uuid:eeeb0728-e17e-4a46-9f21-282a671417f6","Cloning, Sequence Analysis, and Expression in Escherichia coli of the Gene Encoding an alpha-Amino Acid Ester Hydrolase from Acetobacter turbidans","Polderman-Tijmes, J.J.; Jekel, P.A.; de Vries, E.J.; van Merode, A.E.; Floris, R.; van der Laan, J.M.; Sonke, T.; Janssen, D.B.","","2002","","","en","journal article","American Society for Microbiology","","","","","","","","","","","","",""
"uuid:99943327-4858-44b2-9cbc-045c2f154c46","http://resolver.tudelft.nl/uuid:99943327-4858-44b2-9cbc-045c2f154c46","Investigation on flip chip solder joint fatigue with cure-dependent underfill properties","Yang, D.G.; Zhang, G.Q.; Ernst, L.J.; van 't Hof, C.; Caers, J.F.J.M.; Bressers, H.J.L.; Janssen, J.H.J.","","2003","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:60a54a52-8573-4de0-ab16-adf85ca2e9fc","http://resolver.tudelft.nl/uuid:60a54a52-8573-4de0-ab16-adf85ca2e9fc","Towards a Flexible ICT-Architecture for Multi-Channel E-Government Service Provisioning","Janssen, M.F.W.H.A.; Wagenaar, R.; Beerens, J.","","2003","The planning and subsequent nationwide implementation of E-government service provisioning faces a number of challenges at the level of municipalities in the Netherlands. Initiatives are confronted with a highly fragmented ICT-architecture that has been vertically organized around departments and with hardly any common horizontal functionality. This situation is even further enforced by a defacto duopoly on the software market of information systems used by municipalities. The provision of services over web-based channels leads to a need for a more flexible, open ICT architecture based on standardized elements. The goal of the research presented in this paper is to determine the feasibility of a component-based approach to meet the aforementioned challenge for a more flexible, open ICT architecture. The research consisted of two parts (1) the identification of opportunities for generic components in the ICT-architecture of municipalities and (2) supporting the evaluation of these opportunities using simulation.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:fdc0105c-e601-402a-8f16-ca97e9963592","http://resolver.tudelft.nl/uuid:fdc0105c-e601-402a-8f16-ca97e9963592","Defining Uncertainty: A Conceptual Basis for Uncertainty Management in Model-Based Decision Support","Walker, W.E.; Harremoës, P.; Rotmans, J.; Van der Sluijs, J.P.; Van Asselt, M.B.A.; Janssen, P.; Krayer von Krauss, M.P.","","2003","The aim of this paper is to provide a conceptual basis for the systematic treatment of uncertainty in model-based decision support activities such as policy analysis, integrated assessment and risk assessment. It focuses on the uncertainty perceived from the point of view of those providing information to support policy decisions (i.e., the modellers’ view on uncertainty) – uncertainty regarding the analytical outcomes and conclusions of the decision support exercise. Within the regulatory and management sciences, there is neither commonly shared terminology nor full agreement on a typology of uncertainties. Our aim is to synthesise a wide variety of contributions on uncertainty in model-based decision support in order to provide an interdisciplinary theoretical framework for systematic uncertainty analysis. To that end we adopt a general definition of uncertainty as being any deviation from the unachievable ideal of completely deterministic knowledge of the relevant system. We further propose to discriminate among three dimensions of uncertainty: location, level and nature of uncertainty, and we harmonise existing typologies to further detail the concepts behind these three dimensions of uncertainty.We propose an uncertainty matrix as a heuristic tool to classify and report the various dimensions of uncertainty, thereby providing a conceptual framework for better communication among analysts as well as between them and policymakers and stakeholders. Understanding the various dimensions of uncertainty helps in identifying, articulating, and prioritising critical uncertainties, which is a crucial step to more adequate acknowledgement and treatment of uncertainty in decision support endeavours and more focused research on complex, inherently uncertain, policy issues.","uncertainty; ignorance; model-based decision support; policy analysis; integrated assessment; risk assessment; uncertainty management","en","journal article","Swets & Zeitlinger","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:6813d3c8-3348-482a-836d-66d432e1c4d1","http://resolver.tudelft.nl/uuid:6813d3c8-3348-482a-836d-66d432e1c4d1","Capacity assessment of a cellular radio system using a narrowband multiuser detector","Janssen, G.J.M.; Zander, J.","","2003","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:dc775b7f-2bdd-4706-bf69-793fb9255dad","http://resolver.tudelft.nl/uuid:dc775b7f-2bdd-4706-bf69-793fb9255dad","Werkwijze en inrichting voor sputtercoaten van functionele coatings","Janssen, G.C.A.","","2003","A second plasma is generated at the second electrode in a part of the vacuum region (2) located outside the part of this region containing the sputter plasma (8). The substrate is bombarded with ions as it is moved through the second plasma. A method is claimed for operating a sputter coating machine (1) used to apply a coating on at least one substrate. The machine comprises a vacuum region, at least one substrate holder (6), a carousel (4, 5), a fixed first electrode (7), a second electrode and a voltage source (VB). The substrate is placed on top of the substrate holder, which in turn is connected to the carousel for moving the holder along a given path through the vacuum region.; During operation, a sputter plasma is generated at the fixed electrode, comprising a first number of ions located essentially in a first part of the vacuum region between the fixed electrode and a passage point for the substrate holder as it is moved by the carousel. The substrate holder is connected to the voltage source so that during machine operation an acceleration voltage is generated, creating an ion bombardment of the substrate. During operation, a second plasma is generated at the second electrode essentially between a second part of the vacuum region located outside the first part of this region. The second plasma is used to generate a second number of ions for an ion bombardment of the substrate as the substrate holder moves through this second region.; Independent claims are also included for (1) the sputter coating machine; (2) a computer program for a processor unit for this machine, used for activating the second electrode in order to generate the second plasma during movement of the sputter plasma; (3) an information carrier containing this program.","","nl","patent","European Patent Office","","","","","","","","Mechanical, Maritime and Materials Engineering","","","","",""
"uuid:a0d58a12-2842-4524-933b-ce1f1ccacaf9","http://resolver.tudelft.nl/uuid:a0d58a12-2842-4524-933b-ce1f1ccacaf9","Bowthruster-induced damage","Schokking, L.A.; Janssen, P.C.; Verhagen, H.J.","","2003","The stability of stones in propeller-induced jet wash is still difficult to predict. Especially the trend of bowthrusters increasing in size and power in sea going ships (especially ferries) over the last years may be a reason for concern when dealing with the protection of slopes and beds. But also ships used in inland navigation are using bowthrusters more intensively. Because of high costs of crew, many inland navigation ships try to sail with a minimum of crew. In order to allow mooring with a limited number of staff, the manoeuvrability of the ship has to be improved, which is often done by making a bowthruster in the ship. At this moment near mooring dolphins in the navigable rivers of the Netherlands managers are confronted with damage to the slope protection because of heavy use of bowthrusters. From these the conclusion can be drawn that it is necessary to improve design formulas for the effect of a bowthruster, as also suggested by Römisch and Hering (2002). The second step is then to make a conceptual model of the effect of (propeller-induced) turbulence on the stability of the slope, followed by a systematic set of tests in the lab in order to verify the conceptual model and in order to determine the calibration constants in the conceptual model.","bowthruster; stone stability; scour; jet wash; quays","en","journal article","PIANC","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:450fce71-b09b-4198-9615-b021f81f58c0","http://resolver.tudelft.nl/uuid:450fce71-b09b-4198-9615-b021f81f58c0","Tensile stress in hard metal films","Janssen, G.C.A.M.; Dammers, A.J.; Sivel, V.G.M.; Wang, W.R.","","2003","Thin films on substrates are usually in a stressed state. An important, but trivial, contribution to that stress stems from the difference in thermal expansion coefficient of substrate and film. Much more interesting are the intrinsic stresses, resulting from the growth and/or microstructure of the film. Intrinsic compressive stress was explained by d’Heurle in 1970. Intrinsic tensile stress for recrystallizing metal films was treated succesfully by Doljack and Hoffman in 1972. In the present letter we explain the occurrence of tensile stress in nonrecrystallizing metal films. The explanation is based on modern grain growth models and accurate stress measurements. The key ingredient to the explanation is the proof of the existence of a stress gradient in nonrecrystallizing metal films.","metallic thin films; tensile strength; internal stresses; thermal expansion; grain growth","en","journal article","American Institute of Physics","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Science and Engineering","","","",""
"uuid:f670cfb3-ecc3-45da-8aad-5827752e61a3","http://resolver.tudelft.nl/uuid:f670cfb3-ecc3-45da-8aad-5827752e61a3","An Analysis of a Shared Services Centre in E-government","Janssen, M.F.W.H.A.; Wagenaar, R.","","2004","Information systems engineering projects in egovernment are confronted with high costs, lack of expertise and developing similar functionality over and over. A shared services centre might provide common services to local government organizations without affecting the autonomy of organizations and providing the flexibility to enhance and include additional functionality. As such a SSC promises tremendous economies of scale and scope. A promise is however not sufficient, research yields ambiguous results. A sound analysis of motives to use a shared services center and management issues determining success and failure is necessary. The goal of the research presented in this paper is to explore the concept of a shared services center by investigating the motives and management issues determining its successful implementation. We explore the concept by investigating a SSC at the Dutch judicial organization.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:e6ec52d2-8aec-4409-b0e5-df8e6fb704be","http://resolver.tudelft.nl/uuid:e6ec52d2-8aec-4409-b0e5-df8e6fb704be","Mini Track: ‘e-Policy’ (Cluster: e-Government)","Cresswell, A.; Janssen, M.F.W.H.A.","","2004","","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:8a0816cb-d824-405b-a6fa-a1dd5b314ef1","http://resolver.tudelft.nl/uuid:8a0816cb-d824-405b-a6fa-a1dd5b314ef1","Best Mast: a new way to design a rig","Janssen, Robert","","2004","","proceedings","","report","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","","","",""
"uuid:03cebdc5-8524-4658-9d18-0fc48a162323","http://resolver.tudelft.nl/uuid:03cebdc5-8524-4658-9d18-0fc48a162323","De levende natuur als ecosysteemvormer in kustgebieden","Peletier, H.; Janssen, G.M.","Rijkswaterstaat","2004","Wereldwijd vindt erosie plaats van zandige kusten. Ook in Nederland moeten jaarlijks maatregelen worden genomen om de erosie tegen te gaan. Met het oog op de te verwachten ontwikkelingen door veranderingen in het klimaat, zal het erosieprobleem bovendien steeds groter worden. In Nederland wordt erosie bij voorkeur bestreden door het overbrengen van zand van dieper water naar de meer nabij de kust gelegen zone en het strand. Uit de in dit rapport beschreven gegevens, afkomstig uit verschillende literatuurbronnen blijken organismen een belangrijke rol te spelen in de processen die uiteindelijk tot erosie of sedimentatie leiden. Organismen kunnen sediment zowel stabiliseren als destabiliseren. Het rapport geeft hiervan vele voorbeelden. In mariene kustsystemen kan een leefomgeving veranderen door de aanwezigheid van marien fytoplankton, microbiële matten, de wortelende vegetatie, migrerende en slijmafscheidende organismen, organismen die deeltjes uit het water verkitten door het op te eten en weer uit te scheiden, ontstaan riffen en bedden van gravende en kruipende organismen (zie overzicht tab.1). Een aantal van deze organismen stabiliseren of destabiliseren hun omgeving zodat het meer of minder tegen erosie bestand is. Een dicht netwerk van blauwwierdraden veroorzaakt sediment stabilisatie. Diatomeeën produceren slijmstoffen (EPS) die het sediment vastkitten en de erosie beperken. Mucus excretie is een algemeen verschijnsel van organismen die in het sediment wonen zoals meiofauna en polychaeten. Filtrerende schelpdieren vangen zwevende stof in en hebben een stabiliserende werking op sediment transport. Filtreerders (sabellaria, mosselen, oesters) vormen stabiele riffen, verschillende taxa (sponzen, zeesterren, zeekomkommers en kwalpoliepen) verzamelen zich tot groepen die elkaar voordeel bieden bij het invangen van deze partikels. Zo zijn er tal van voorbeelden waarin organismen een invloed uitoefenen op de dode natuur. Het omwerken van sediment door organismen gebeurt in bijna alle kustgebieden. De meest effectieve bioturbators zijn kreeften en garnalen. Zij komen vaak in hoge dichtheden voor en monopoliseren de benthische gemeenschap volledig. Naast organismen die sedimentpartikels van de bodem eten en zo het sediment bewerken zijn er ook organismen die het sediment verstoren doordat ze lopen en kruipen over het oppervlak, een schuilplaats zoeken, macrobenthos eten en herbivoren die zich met rhizomen voeden, het omwoelen van de bodem op deze manieren noemen we bioturbatie. Al deze gravers met hun kokers en holen destabiliseren het sediment en hebben effect op erosie processen in mariene kustsystemen. Belangrijke stabiliseerders zijn microalgen en kwelder-en duinvegetaties. Filtreerders die ook banken en riffen vormen en een aantal polychaeten (vooral kokerwormen) stabiliseren het sediment ook. Destabiliserend zijn de activiteiten van een aantal polychaeten, amphipoden, isopoden en enkele crustacea. Menselijke activiteiten zoals de boomkorvisserij en betreding in duingebieden hebben ook een destabiliserend effect. Het verdient aanbeveling de kennis over de rol van de levende natuur in kustgebieden te gebruiken voor een optimalisatie van het beheer en beleid van de kust. Daartoe is het noodzakelijk een vervolgstap te zetten op deze inventarisatie. Daarbij moeten de volgende aspecten aan de orde komen: het kwantificeren van de rol van de levende natuur in het Nederlandse kustgebied, het opstellen van een voor het beleid en beheer bruikbaar model waarin de processen goed worden beschreven én een nadere studie naar de effecten van menselijke activiteiten op de (de-)stabiliserende werking van organismen in de kustzone.","ecosysteem; zand; kust; ecologie; erosie; stabiliseren","nl","report","Rijkswaterstaat, RIKZ","","","","","","","","","","","","",""
"uuid:ef9af09b-a4b2-4f9d-b675-9cbb140fc41d","http://resolver.tudelft.nl/uuid:ef9af09b-a4b2-4f9d-b675-9cbb140fc41d","An overview of ultra wide band indoor channel measurements and modeling","Irahhauten, Z.; Nikookar, H.; Janssen, G.J.M.","","2004","","","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:8e7ab270-f7e0-4a08-a4e4-7ccda1ed8c7d","http://resolver.tudelft.nl/uuid:8e7ab270-f7e0-4a08-a4e4-7ccda1ed8c7d","ILCA-model 'integrated life cycle approach'-model, increasing insight in through-life performance of equipment on board ships","Janssen, R.","","2004","","","","other","","","","","","","","indefinite","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Design, Production and Operation","","",""
"uuid:08479bd0-1469-41eb-906c-b43057d0f9cc","http://resolver.tudelft.nl/uuid:08479bd0-1469-41eb-906c-b43057d0f9cc","Antenna diversity for a narrow-band successive-cancellation multiuser detector","Janssen, G.J.M.; Slimane, S.B.","","2004","","","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:1fb9172a-4c3a-4e4f-9359-db151ee0c8bd","http://resolver.tudelft.nl/uuid:1fb9172a-4c3a-4e4f-9359-db151ee0c8bd","Determination of resist parameters using the extended Nijboer-Zernike theory","Dirksen, P.; Braat, J.; Janssen, A.J.E.M.; Leeuwestein, A.; Kwinten, H.; Van Steenwinckel, D.","","2004","This study presents an experimental method to determine the resist parameters that are at the origin of a general blurring of the projected aerial image. The resist model includes the effects of diffusion in the horizontal plane and a second cause for image blur that originates from a stochastic variation of the focus parameter. The used mathematical framework is the so-called Extended Nijboer-Zernike (ENZ) theory. The experimental procedure to extract the model parameters is demonstrated for several 193 nm resists under various conditions of post exposure baking temperature and baking time. The advantage of our approach is a clear separation between the optical parameters, such as feature size, projection lens aberrations and the illuminator setting on the one hand and process parameters introducing blur on the other.","optical lithography; resist; diffusion constant; focus noise; point-spread function; Extended Nijboer-Zernike theory","en","conference paper","SPIE","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:2d28ad0a-d156-4259-8d09-46d1eedebdfe","http://resolver.tudelft.nl/uuid:2d28ad0a-d156-4259-8d09-46d1eedebdfe","De ecologie van de zandige kust van Nederland: Inventarisatie van het marcobenthos van zand en brandingszone","Janssen, G.M.; Mulder, S.","Rijkswaterstaat","2004","Al vele eeuwen worden de duinen en het voorliggende strand met brandingszone gebruikt ter bescherming van het land tegen overstroming door de zee. De zandige kust is echter meer dan alleen een zandvoorraad, een natuurlijk verdedigingswerk tegen de zee. Het is een waardevol ecosysteem dat bescherming verdient. De bescherming van het kustmilieu is vastgelegd in (inter)nationale wet- en regelgeving, zoals de EU KaderrichtlijnWater en de EU Vogel- en Habitatrichtlijn en in internationale verdragen en aanbevelingen. Voorbeelden zijn het mondiale Biodiversiteitsverdrag en de aanbeveling tot aanwijzing van een internationaal netwerk van beschermde kust- en zeegebieden ter bescherming van het mariene milieu. Volgens een recente EU-aanbeveling zal het beheer van de kust bovendien moeten zijn gebaseerd op een ecosysteembenadering. Om dat kustmilieu te kunnen beschermen moet je er wel kennis over hebben: hoe ziet het eruit, welke functies vervult het en welke organismen leven er? Voor de Nederlandse kust veronderstellen we dat de belangrijkste bedreigingen op de langere termijn samenhangen met de klimaatveranderingen in combinatie met het sociaal-economisch ruimtegebruik van het land direct in of achter de duinen. Op de korte termijn vormen zandsuppleties, die nodig zijn om erosie tegen te gaan, het mechanisch schoonmaken van stranden en verstoring, beide laatsten als gevolg van een toenemende recreatiedruk, belangrijke potentiële bedreigingen. De invloed van de verrijking van het kustwater met voedingsstoffen heeft in de afgelopen decennia vermoedelijk een rol gespeeld, die nog niet is uitgespeeld. Onder het motto Strand is meer dan zand werd in het jaar 2000 gestart met het beschikbaar maken en ontwikkelen van kennis over de ecologie van de zandige kust. In 2001 en 2002 werd door het Rijksinstituut voor Kust en Zee onderzoek uitgevoerd naar het voorkomen van bodemdieren op 9 verschillende stranden langs de Nederlandse kust en op 2 raaien in de brandingzone voor de Hollandse kust. Uit de strandinventarisatie blijken duidelijke verschillen tussen de stranden van de Hollandse kust en die van de Waddeneilanden. Hoewel er grote locale verschillen optreden laten de stranden van de Waddeneilanden zich kenmerken door fijn, kalkarm zand met een goede doordringbaarheid. Het sediment is slecht gesorteerd, hetgeen betekent dat zandkorrels van allerlei maten door elkaar voorkomen. Deze stranden zijn vlak en herbergen veel soorten in hoge dichtheden. De stranden langs de Hollandse kust zijn steiler en bestaan uit grover zand dat beter is gesorteerd. Voor zover ten zuiden van Egmond gelegen bevatten ze meer kalk. De doordringbaarheid, de soortenrijkdom en het aantal individuen is kleiner dan op de stranden van de Waddeneilanden. Door de resultaten van alle 9 stranden bij elkaar te nemen werd het mogelijk de ruimtelijke variatie op het strand, dwars op de kust, te beschrijven. Hoog op het strand, rond de hoogwaterlijn is de korrelgrootte het kleinst, de sortering het slechtst, het kalkgehalte het laagst en de kracht die nodig is om in de bodem door te dringen het grootst. Voor organismen die tussen de zandkorrels in de bodem leven betekent dit dat de omstandigheden op de lager gelegen delen van het strand beter zijn dan op de hoger gelegen delen. In de richting van de laagwaterlijn kenmerkt het sediment zich namelijk door een gemakkelijkere doordringbaarheid door een grotere waterinhoud, een goede sortering en een grotere gemiddelde korrelgrootte. Een en ander is terug te vinden in het aantal soorten dat toeneemt in de richting van de laagwaterlijn. Het aantal individuen is laag rond de hoogwaterlijn en het hoogst in het gebied van gemiddeld tij. Voor vogels die foerageren op het strand is een gemakkelijke doordringbaarheid voor de snavel in het zand en de beschikbaarheid van voedsel zoals de Gemshoornworm, van belang. Het verband tussen het voorkomen van organismen en enkele sedimentkarakteristieken, zoals dat voor de Nederlandse stranden is gevonden, is in overeenstemming met hetgeen uit de literatuur over de ecologie van zandige kusten elders in de wereld bekend is. Op grond van een clusteranalyse van de strandgegevens kan worden aangenomen dat de soortengemeenschap boven de hoogwaterlijn zich onderscheidt van de gemeenschap die zich bevindt tussen de hoogwaterlijn en de laagwaterlijn. Boven de hoogwaterlijn betreft het vooral terrestrische organismen, zoals insecten en de strandvlo. Op grond van clusteranalyse, kite-diagrammen en de verdeling van het aantal soorten over de verschillende locaties dwars op het strand, kan worden aangenomen dat er een specifieke groep organismen boven de hoogwaterlijn voorkomt. Mogelijk is er een tweedeling van het getijdenstrand in een zone boven de gemiddelde waterstand en een zone beneden de gemiddelde waterstand. De organismen in de bovenste zone worden in de onderste zone aangevuld met extra soorten. Op het strand komen vooral vertegenwoordigers van Amphipoda, Polychaeta en Isopoda voor. Verkennend onderzoek in de brandingzone voor de Hollandse kust toont aan dat er zich twee brekerbanken bevinden. Eén op circa 150 meter vanuit de kust gerekend vanaf laagwaterlijn en één op circa 400 meter met daar tussen een trog met een diepte van ruim 5 meter beneden NAP. Het sediment in de trog kenmerkt zich door grofkorrelig, goed gesorteerd zand met een hoog kalk- en slibgehalte. Clusteranalyse op het voorkomen van macrobenthos geeft aan dat er drie groepen te onderscheiden zijn: een groep organismen zeewaarts buiten de buitenste brekerbank; een groep organismen in de brandingszone en tenslotte nog daarbinnen een groep in de trog die vooral bestaat uit grote aantallen schelpkokerwormen. Deze kokerwormen spelen vermoedelijk een belangrijke rol in het vasthouden, het stabiliseren van het sediment en daarmee de kust. In de soortenarme maar individurijke brandingszone tussen het strand en de buitenste brekerbank zijn de Polychaeten dominant. De zone zeewaarts van de buitenste brekerbank gelegen bevat veel meer soorten. Deze zijn vooral uit de hoofdgroepen Amphipoda, Bivalvia en Echinoïdea afkomstig. Met het nieuw verworven inzicht dat onze zandige kust uit meer bestaat dan alleen zand, wordt het mogelijk om de bescherming van het land én de bescherming van het mariene milieu te combineren tot kustbescherming in de ware zin van het woord. Daarmee kan een belangrijke stap voorwaarts worden gezet in het streven te komen tot integraal kustbeheer, waarin menselijke activiteiten zoals het suppleren van zand, zijn gebaseerd op een ecosysteembenadering. Bij het opstellen van maatlatten, een beoordelingssysteem voor de Kaderrichtlijn Water en advisering over de effecten van kustingrepen in het kader van de Vogel- en Habitatrichtlijn is reeds gebruik gemaakt van de nieuw verworven kennis. De meest voorkomende soort op het strand, de Gemshoornworm, is een belangrijke voedselbron voor de Drieteenstrandloper, die wordt beschermd onder de Vogelrichtlijn. De bodemfauna in de 1-mijls zone voor de kust wordt beschermd via de Kaderrichtlijn Water. Het natte strand, de brandingszone en een deel van de ondiepe kust vallen binnen deze beschermingszone. Door de kennis die is opgedaan is het nu mogelijk een eerste beschrijving van de diversiteit van het bodemleven in deze verschillende delen van de zandige kust te geven. Bovendien kan nu voorzichtig worden ingeschat welke functie de verschillende organismen in het ecosysteem van de zandige kust kunnen hebben, welke rol ze spelen voor de stabiliteit van de kust, voor de processen van sedimentatie en erosie. Tenslotte zal de kennis over de ecologie van de zandige kust zeer bruikbaar zijn voor het beheer van de speciale beschermingszones langs de kust waarvoor Rijkswaterstaat in het kader van de Natuurbeschermingswet als uitvloeisel van de Vogel- en Habitatrichtlijn de beheerplannen moet gaan opstellen.","ecologie; kust; marcobenthos; inventarisatie; biodiversiteit","nl","report","Rijkswaterstaat, RIKZ","","","","","","","","","","","","Ecologie van de zandige kust",""
"uuid:7fd80c42-9c43-41cf-b4ca-d99b4a95b534","http://resolver.tudelft.nl/uuid:7fd80c42-9c43-41cf-b4ca-d99b4a95b534","Stress in hard metal films","Janssen, G.C.A.M.; Kamminga, J.D.","","2004","In the absence of thermal stress, tensile stress in hard metal films is caused by grain boundary shrinkage and compressive stress is caused by ion peening. It is shown that the two contributions are additive. Moreover tensile stress generated at the grain boundaries does not relax by ion bombardment. In polycrystalline hard metal films the grain structure evolves during growth, leading to wider grains higher up in the film. The tensile component of the stress in the film is generated at the grain boundaries and therefore depends on film thickness. The effect of ion bombardment is independent of grain size, therefore compressive stress does not depend on film thickness. As a result in polycrystalline films deposited under a bias voltage a stress gradient exists from tensile at the interface to compressive at the top of the film.","chromium; metallic thin films; ion-surface impact; grain boundaries; shot peening; grain growth; grain size; internal stresses; elastic constants","en","journal article","American Institute of Physics","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Science and Engineering","","","",""
"uuid:c3f18769-cb4f-4f91-b206-00bcb37f42a5","http://resolver.tudelft.nl/uuid:c3f18769-cb4f-4f91-b206-00bcb37f42a5","Complex pupil function reconstruction at high numerical aperture using the extended Nijboer-Zernike diffraction theory","Braat, J.J.M.; Dirksen, P.; Janssen, A.J.E.M.; Van de Nes, A.S.","","2004","Poster presentation with Philips Research Laboratories","","en","journal article","Delft Universityof Technology","","","","","","","","Applied Sciences","","","","",""
"uuid:a4a956e2-a820-44c0-9be5-999295af1484","http://resolver.tudelft.nl/uuid:a4a956e2-a820-44c0-9be5-999295af1484","Realization of a quantum standard for AC voltage: Overview of a European research project","Chevtchenko, O.A.; van den Brom, H.E.; Houtzager, E.; Behr, R.; Kohlmann, J.; Williams, J.M.; Janssen, T.J.B.M.; Palafox, L.; Humphreys, D.A.; Piquemal, F.; Djordjevic, S.; Monnoye, O.; Poletaeff, A.; Lapuh, R.; Rydler, K.E.; Eklund, G.","","2005","","","en","journal article","IEEE","","","","","","","","","","","","",""
"uuid:2fbc031f-9d31-49de-8f48-e066ea65bb3e","http://resolver.tudelft.nl/uuid:2fbc031f-9d31-49de-8f48-e066ea65bb3e","Enterprise Architecture Integration in E-government","Janssen, M.F.W.H.A.; Cresswell, A.","","2005","Achieving goals of better integrated and responsive government services requires moving away from stand alone applications toward more comprehensive, integrated architectures. As a result there is mounting pressure to move from disparate systems operating in parallel toward a shared architecture designed to support information exchange and cross-agency business processes. This paper presents a simulation-based approach to designing and evaluating ways to achieve such sharing. This approach support the mapping EAI technology on the business processes needing to be supported and is based on technology, business process and stakeholder-level components. Discreteevent simulation and animation combined with activity-based costing is used to evaluate the benefits of the proposed EAI solution. The results provide insight into the implications of EAI, used to support information sharing and integration of service processes. In this way the benefits and implications of the EAI approach can be assessed.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:25523eca-40f2-46df-b307-b0e2d8e43ca0","http://resolver.tudelft.nl/uuid:25523eca-40f2-46df-b307-b0e2d8e43ca0","The Development of a Reference Architecture for Local Government","Janssen, M.F.W.H.A.; Cresswell, A.","","2005","Traditionally, government agencies are organized vertically around departments. Many local government agencies are looking for ways to develop an integrated architecture. Many architectural methods are available, however, they remain often abstract, provide limited support for the translation of the concepts to a concrete situation, and have limited visualization support to create a shared understanding. In the research presented in this paper we describe the development of a reference enterprise architecture for a municipality using action research. Our development approach is based on modeling the interdependencies among, and within organization, business process, and application layer. We used discrete-event simulation, and animation to provide insight in the existing situation, and develop and create a shared understanding of the reference architecture.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:98e2f63e-175e-4138-ba63-f53de0f75f39","http://resolver.tudelft.nl/uuid:98e2f63e-175e-4138-ba63-f53de0f75f39","E-Policy, Law and Governance: Minitrack introduction","Janssen, M.F.W.H.A.; Krimmer, R.; Maxwell, T.A.","","2005","","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:e8ee9d54-76e2-4172-b5c8-1c29edcd744e","http://resolver.tudelft.nl/uuid:e8ee9d54-76e2-4172-b5c8-1c29edcd744e","Stress in sputter-deposited Cr films: Influence of Ar pressure","Grachev, S.Y.; Tichelaar, F.D.; Janssen, G.C.A.M.","","2005","We studied the tensile stress and grain-width evolution in sputter-deposited Cr films with thickness from 20?nm to 2.7??m. Films were deposited in an industrial Hauzer 750 physical vapor deposition machine at 50–80?°C. The films exhibited a columnar microstructure. A power law behavior of the tensile stress as well as of the average grain width with thickness was observed. Both power exponents were strongly dependent on the Ar pressure during deposition. The power exponent ? for stress varied from 0.26 to 0.79 for the range of Ar pressures used (5×10?3–2×10?2?mbar). The mechanism of tensile stress generation is the shrinkage of the grain boundaries. Assuming the same shrinkage of the grain boundaries all through the layer, the stress and the grain width would be inversely proportional. Indeed, the grain width followed the same power law as the stress at low Ar pressure [? = 0.3(1)], but not at high Ar pressure [? = 0.58(3)]. Transmission electron microscopy showed the formation of numerous voids. At higher Ar pressure the void fraction is significantly higher than at low pressure, thereby diminishing stress generation.","chromium; metallic thin films; grain boundaries; voids (solid); internal stresses; transmission electron microscopy; grain growth; sputtered coatings; grain size","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","Kavli Institute of Nanoscience","","","",""
"uuid:9b17f08c-0748-4175-b4b4-2365304ae004","http://resolver.tudelft.nl/uuid:9b17f08c-0748-4175-b4b4-2365304ae004","Aberration retrieval for high-NA optical systems using the Extended Nijboer-Zernike theory","Dirksen, P.; Braat, J.J.M.; Janssen, A.J.E.M.; Leeuwesteijn, A.","","2005","","optical lithography; high NA; vectorial diffraction formalism; point-spread function; Extended Nijboer-Zernike theory","en","conference paper","SPIE","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:f05d1c59-20a4-464f-8898-a7ea8905be2e","http://resolver.tudelft.nl/uuid:f05d1c59-20a4-464f-8898-a7ea8905be2e","Extended Nijboer–Zernike approach to aberration and birefringence retrieval in a high-numerical-aperture optical system","Braat, J.J.M.; Dirksen, P.; Janssen, A.J.E.M.; Van Haver, S.; Van de Nes, A.S.","","2005","The judgment of the imaging quality of an optical system can be carried out by examining its through-focus intensity distribution. It has been shown in a previous paper that a scalar-wave analysis of the imaging process according to the extended Nijboer–Zernike theory allows the retrieval of the complex pupil function of the imaging system, including aberrations as well as transmission variations. However, the applicability of the scalar analysis is limited to systems with a numerical aperture (NA) value of the order of 0.60 or less; beyond these values polarization effects become significant. In this scalar retrieval method, the complex pupil function is represented by means of the coefficients of its expansion in a series involving the Zernike polynomials. This representation is highly efficient, in terms of number and magnitude of the required coefficients, and lends itself quite well to matching procedures in the focal region. This distinguishes the method from the retrieval schemes in the literature, which are normally not based on Zernike-type expansions, and rather rely on pointby-point matching procedures. In a previous paper [J. Opt. Soc. Am. A 20, 2281 (2003)] we have incorporated the extended Nijboer–Zernike approach into the Ignatowsky–Richards/Wolf formalism for the vectorial treatment of optical systems with high NA. In the present paper we further develop this approach by defining an appropriate set of functions that describe the energy density distribution in the focal region. Using this more refined analysis, we establish the set of equations that allow the retrieval of aberrations and birefringence from the intensity point-spread function in the focal volume for high-NA systems. It is shown that one needs four analyses of the intensity distribution in the image volume with different states of polarization in the entrance pupil. Only in this way will it be possible to retrieve the “vectorial” pupil function that includes the effects of birefringence induced by the imaging system. A first numerical test example is presented that illustrates the importance of using the vectorial approach and the correct NA value in the aberration retrieval scheme.","mathematical methods in physics; diffraction theory; inverse problems; phase retrieval; image formation theory; optical systems","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:aa260b5e-133e-41e8-baa7-4aae24dfc45a","http://resolver.tudelft.nl/uuid:aa260b5e-133e-41e8-baa7-4aae24dfc45a","Generalized evolution equations for nonlinear surface gravity waves over two-dimensional topography","Janssen, T.T.; Herbers, T.H.C.; Battjes, J.A.","","2006","","","en","journal article","Cambridge University Press","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:4326de91-8a24-4b76-addb-851ac3d427be","http://resolver.tudelft.nl/uuid:4326de91-8a24-4b76-addb-851ac3d427be","A Complex Adaptive System Perspective of Enterprise Architecture in Electronic Government","Janssen, M.F.W.H.A.; Kuk, G.","","2006","Within the public sector, the deployment of enterprise architecture is often an attempt to address the decentralization/centralization relationships to improve the links between the central and the local governments. The underlying aim is to provide a better structure to manage the diverse, independent and local IT-related projects and development activities. In this paper we propose a novel approach to analyzing and understanding the requirements and limitations for enterprise architectures in government. We use the perspective of a complex adaptive system as a metaphor to examine 11 e-government projects with each involved the development of enterprise architecture in the Netherlands (1980s - 2004). Through analyzing the key interaction points between the central and the local governments, we identify architectural design principles that will increase interorganizational jointness and IT implementation success.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:dea6a46e-a05b-4492-afd7-53fe95d886fc","http://resolver.tudelft.nl/uuid:dea6a46e-a05b-4492-afd7-53fe95d886fc","Performance enhancement of differential UWB autocorrelation receivers under ISI","Pausini, M.; Janssen, G.J.M.; Witrisal, K.","","2006","","","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:3c60e104-0f4b-4c10-b7c7-e48cfaa949ef","http://resolver.tudelft.nl/uuid:3c60e104-0f4b-4c10-b7c7-e48cfaa949ef","Application of statistical methods for making maintenance decisions within power utilities","Jongen, R.A.; Morshuis, P.H.F.; Gulski, E.; Smit, J.J.; Maksymiuk, J.; Janssen, A.L.J.","","2006","","statistics; reliability; insulation life; cable joints; epoxy-resin bushings","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:432527f3-1a78-4512-aeb2-b58218431a33","http://resolver.tudelft.nl/uuid:432527f3-1a78-4512-aeb2-b58218431a33","E-Policy, Law and Governance: Minitrack introduction","Janssen, M.F.W.H.A.; Holden, S.H.; Maxwell, T.A.","","2006","","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:45a77fbd-2b5e-4381-a1bd-2d46830217c8","http://resolver.tudelft.nl/uuid:45a77fbd-2b5e-4381-a1bd-2d46830217c8","Estimating resist parameters in optical lithography using the extended Nijboer-Zernike theory","Dirksen, P.; Braat, J.; Janssen, A.J.E.M.","","2006","","optical lithography; resist; diffusion constant; focus noise; pointspread function; extended Nijboer-Zernike theory","en","journal article","SPIE","","","","","","","","Applied Sciences","Optics Research Group","","","",""
"uuid:03b0de69-3535-4188-8937-25d8bf7b0641","http://resolver.tudelft.nl/uuid:03b0de69-3535-4188-8937-25d8bf7b0641","Aerial image based lens metrology for wafer steppers","Dirksen, P.; Braat, J.J.M.; Janssen, A.J.E.M.; Leeuwestein, A.; Matsuyama, T.; Noda, T.","","2006","Phase Measurement Interferometers (PMI) are widely used during the manufacturing process of high quality lenses. Although they have an excellent reproducibility and sensitivity, the set-up is expensive and the accuracy of the measurement needs to be checked frequently. This paper discusses an alternative lens metrology method that is based on an aerial image measurement. We discuss the Extended Nijboer-Zernike (ENZ) method and its application to aberration measurement of a high-NA optical system of a wafer stepper. ENZ is based on the observation of the through-focus intensity point-spread function of the projection lens. The advantage of ENZ is a simple set-up that is easy to run and maintain and provides good accuracy. Therefore the method is useful during lens assembly in the factory. The mathematical framework of ENZ is shown and the experimental procedure to extract aberrations for a high-NA lens is demonstrated on a high-NA DUV lithographic lens. PMI data is given as reference data. It is shown that ENZ provides an attractive alternative to the interferometer.","optical lithography; aberrations; PMI; extended Nijboer-Zernike theory","en","conference paper","SPIE","","","","","","","","Applied Sciences","IST/Optica","","","",""
"uuid:1c713c66-1d05-407f-b5f1-a4815cb13cb1","http://resolver.tudelft.nl/uuid:1c713c66-1d05-407f-b5f1-a4815cb13cb1","Properties of immobilised penicillin G Acylase in beta-lactam antibiotic synthesis","Janssen, M.H.A.","Sheldon, R.A. (promotor)","2006","The beta-lactam antibiotics are the most important class of antibiotics used today. In the last decade the production routes of these antibiotics have shifted from chemical routes to more environmentally benign routes using the enzyme penicillin G acylase. For both practical and economical reasons the enzyme is immobilised. As the kinetically controlled synthesis reaction is performed in aqueous medium with a hydrolytic enzyme, hydrolysis of the activated acyl donor, e.g. D-phenyl glycine amide and the antibiotic product, e.g. cephalexin, ampicillin, is unavoidable. The immobilisation of the enzyme further promotes the unwanted hydrolysis reactions due to diffusion limitation. This was shown in chapters 3 and 4 for penicillin G acylase immobilised on Eupergit C, Eupergit C 250 L, and Sepabeads. The average catalytic activities per immobilised enzyme molecule were investigated using two active-site titration methods, one using a fluoride ion-selective electrode for the first time (chapter 5). Thus, the work described in this thesis has resulted in a better understanding of the effects of diffusion limitation on the catalytic performance of immobilised penicillin acylase in beta-lactam antibiotic synthesis.","penicillin acylase; antibiotics; immobilisation; active-site titration; cephalexin","en","doctoral thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:0f2c9d56-d2eb-4dc7-961e-61733a384c09","http://resolver.tudelft.nl/uuid:0f2c9d56-d2eb-4dc7-961e-61733a384c09","Nonlinear surface waves over topography","Janssen, T.T.","Battjes, J.A. (promotor); Herbers, T.H.C. (promotor)","2006","As ocean surface waves radiate into shallow coastal areas and onto beaches, their lengths shorten, wave heights increase, and the wave shape transforms from nearsinusoidal to the characteristic saw-tooth shapes at the onset of breaking; in the ensuing breaking process the wave energy is cascaded to small-scale turbulent motions in the surf zone. This nearshore transformation of ocean waves, and the modeling thereof, is the subject of this thesis. In particular, the integral objective of the present work is to develop and verify a stochastic model for directionally spread random wave fields over topography in the nearshore.","surface waves; nonlinear surface waves; wave evolution; wave propagation; nearshore wave propagation; topography; forced long waves; harmonic generation; stochastic wave model; deterministic wave model","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:9e4de9a2-6717-4743-8bcb-3252dff42743","http://resolver.tudelft.nl/uuid:9e4de9a2-6717-4743-8bcb-3252dff42743","The Bemarivo suture zone (North Madagascar), a continental rift?","Janssen, Paul (Utrecht University)","","2006","","","en","report","Utrecht University","","","","","","","","","","","","Molengraaff Fonds",""
"uuid:f6c2834c-11c0-4018-8340-db35d5044004","http://resolver.tudelft.nl/uuid:f6c2834c-11c0-4018-8340-db35d5044004","Stress gradients in CrN coatings","Janssen, G.C.A.M.; Tichelaar, F.D.; Visser, C.C.G.","","2006","Stress in hard films is the net sum of tensile stress generated at the grain boundaries, compressive stress due to ion peening, and thermal stress due to the difference in thermal expansion of the coating and substrate. The tensile part due to grain boundaries is thickness dependent. The other two contributions are not thickness dependent. Summation of the three components leads to a stress gradient in the coating. In the present paper it is demonstrated that adding the three contributions mentioned above yields a good description of the observed dependence of stress on thickness in CrN coatings.","chromium compounds; coatings; tensile strength; grain boundaries; compressive strength; thermal stresses; thermal expansion","en","journal article","American Institute of Physics","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Science and Engineering","","","",""
"uuid:ac49ba14-d040-4023-93c8-660f5774ccd7","http://resolver.tudelft.nl/uuid:ac49ba14-d040-4023-93c8-660f5774ccd7","On the phase of plasmons excited by slits in a metal film","Janssen, O.T.A.; Urbach, H.P.; 't Hooft, G.W.","","2006","The excitation of surface plasmons by subwavelength slits in metal films is studied using a rigorous diffraction model. It is shown that the plasmon is launched by a slit in antiphase with the incident magnetic field. This is true independent of slit width and of the metal used. Using this phase information, maxima and minima in transmission are explained in the case of two and more slits.","apertures; gratings; surface plasmons; phase","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:073e2831-bc4b-4294-980d-3784595bfb32","http://resolver.tudelft.nl/uuid:073e2831-bc4b-4294-980d-3784595bfb32","Minitrack: E-Government Infrastructure and Interoperability","Janssen, M.; Klischewski, R.; Demirkan, H.","","2007","","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:e6158cd4-4c0d-41db-b949-0ee88fb4a12a","http://resolver.tudelft.nl/uuid:e6158cd4-4c0d-41db-b949-0ee88fb4a12a","Strandlopers: Inventarisatie van strandgebruik aan de Noordzeekust en de relatie met natuurwetgeving","Jonker, S.Y.; Janssen, G.M.","Rijkswaterstaat","2007","Bij Rijkswaterstaat en Directoraat Generaal Water liggen op dit moment vraagstukken op het gebied van de implementatie van (Europese) natuurwetgeving en de handhaving van de kustveiligheid. Er moeten afwegingen gemaakt worden op het gebied van de beschermingsplicht van diverse soorten en habitats enerzijds en kustonderhoud en andere activiteiten anderzijds. Hiertoe is het nodig kwantitatief inzicht te hebben in activiteiten op de zandige kust. Dit rapport is een inventarisatie van de bedoelde activiteiten in ruimte en tijd en hun relatie tot de te beschermen natuurwaarden en gebieden. De inventarisatie en uitwerking kwam tot stand via het enquêteren van de kustgemeenten en het analyseren van beschikbare literatuur. Verspreid over de Nederlandse kust zijn er stranden die zijn aangewezen als speciale beschermingszones binnen het Natura 2000-netwerk. De te beschermen soorten en habitats zijn opgenomen in de Europese Vogel- en Habitatrichtlijn en voor Nederland doorgevoerd in de Natuurbeschermingswet en de Flora- en Faunawet. Het betreft hier diverse vogelsoorten, waaronder de drieteenstrandloper en een aantal habitattypen: bij eb droogvallende slikwadden en zandplaten (1140), éénjarige pioniersvegetatie (1310, zeekraal en andere zoutminnende soorten) en embryonale wandelende duinen (2110). Wat betreft het strand kunnen de Noordzeekustzone en de Voordelta, met de aangrenzende beschermde duingebieden, hierbij als hoofdgebieden worden aangemerkt. Binnen deze gebieden geldt er een restrictie wat betreft activiteiten die er al of niet plaats mogen vinden, waarbij de mogelijke nadelige gevolgen voor beschermde soorten en habitats een essentieel onderdeel zijn. Naar aanleiding van kustlijnmetingen worden er zandsuppleties uitgevoerd op locaties met een zwakke of achteruitgaande kust. Een algemene trend is de relatieve toename van onderwatersuppleties ten opzichte van suppleties op het strand. De Zeeuwse kust kent noodgedwongen nog veelal strandsuppleties. Naast locaties waar tot nu toe weinig of nooit is gesuppleerd is er een aantal locaties waar de afgelopen tien jaar elke vijf jaar of vaker een suppletie heeft plaatsgevonden. Dit geldt met name voor de Hollandse kust: op of nabij publieke stranden (bijvoorbeeld Bergen aan Zee, Egmond aan Zee en Hoek van Holland), maar ook in het gebied tussen Kijkduin en Hoek van Holland (één van de zwakke schakels in de Nederlandse kust). Op de Waddeneilanden is er vooral veel voor De Koog (Texel) gesuppleerd, evenals aan de Zeeuwse kust op Zuidwest-Walcheren en het strand van Vlissingen. Uit de inventarisatie komt naar voren dat een aantal van de herhaalde suppletielocaties overeenkomen met de locatie van drukbezochte badstranden. Bijvoorbeeld op Texel is juist het strand nabij De Koog erg druk bezocht. Hetzelfde geldt voor de stranden van Bergen aan Zee, Egmond aan Zee, Hoek van Holland, Zuidwest-Walcheren en Vlissingen. Daarbuiten zijn de stranden van Zandvoort en Scheveningen zeer drukbezochte stranden, zowel door reguliere badgasten als evenementen. Voor de meeste van deze stranden geldt bovendien dat ze (s zomers) geregeld mechanisch worden gereinigd en dat er veel strandpaviljoens staan met de nodige bijbehorende activiteit. De algemene indruk is dat veel activiteiten aan elkaar gekoppeld zijn via het thema recreatie en elkaar onderling in stand houden en stimuleren. Hierdoor ontstaat een aantal concentratiegebieden met een opeenstapeling van activiteiten, waarvan bekend is dat ze jaarlijks terugkeren. Op de stranden van de Waddeneilanden (Texel, Vlieland en Ameland) en de Zeeuwse eilanden (Goeree, Schouwen en Walcheren) vinden de activiteiten (suppleties, recreatie en aanverwanten) ook plaats binnen de grenzen van de speciale beschermingszones Noordzeekustzone en Voordelta. De menselijke activiteiten kunnen beschermde vogels zowel direct verstoren als indirect via het verwijderen en/of doden van voedselbronnen en het ongeschikt maken van de omgeving als broed- of rustgebied. De beschermde habitattypen kunnen worden geschaad of verwijderd door betreden en berijden, zandschuiven, mechanisch reinigen en suppleren. Stranden waar vaker dan eens per vijf jaar wordt gesuppleerd hebben mogelijk niet genoeg tijd om ecologisch gezien te herstellen. Het is van belang te onderzoeken of de effecten van de diverse activiteiten in (en buiten) de speciale beschermingszones significante gevolgen hebben voor de te beschermen natuurwaarden en hoe deze gevolgen beperkt kunnen worden. De huidige verdeling van activiteiten vindt plaats via concentratiegebieden. Binnen de grenzen van waarborgen van de kustveiligheid en de grote behoefte aan mogelijkheden voor recreatie aan het strand, kan de optimalisatie van de afstemming tussen bescherming van natuurwaarden en de bescherming van het achter de duinen gelegen land het best via zonering tot stand komen. Economisch belangrijke drukke stranden kunnen hun functie behouden (natuur heeft hier al weinig kans zich te ontwikkelen) en de meer natuurlijke en minder verstoorde stranden (waaronder die binnen de sbzs Voordelta en Noordzeekustzone) kunnen zoveel mogelijk worden gevrijwaard van verstorende activiteiten.","strandgebruik; Noordzeekust; kust; kustlijn; zandsuppletie; inventarisatie; beschermingszone; ecologie","nl","report","Rijkswaterstaat, RIKZ","","","","","","","","","","","","",""
"uuid:bca7d95b-344d-43c6-8608-a2ced5e6685f","http://resolver.tudelft.nl/uuid:bca7d95b-344d-43c6-8608-a2ced5e6685f","Analyzing Enterprise Architecture in National Governments: The cases of Denmark and the Netherlands","Janssen, M.F.W.H.A.; Hjort-Madsen, K.","","2007","National enterprise architectures (NEA) promise to fill the gap between policy and implementation. NEAs are embedded within an institutional environment consisting of active players capable of responding strategically and innovatively to architectural initiatives, which might complicate NEA adoption. In this paper we analyze the efforts of two European national governments in developing enterprise architecture. Grounded in institutional theory and practice we develop an analytical framework and use this framework to analyze the efforts of two countries, Denmark and the Netherlands. Our framework and analysis draws the attention to the need to take a broader perspective on enterprise architecture, especially governance aspects determine the adoption and diffusion of NEA.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:eb39dca7-2fb3-4ae4-aad7-8b38b0aae9d9","http://resolver.tudelft.nl/uuid:eb39dca7-2fb3-4ae4-aad7-8b38b0aae9d9","Scenario building for E-Government in 2020: Consolidating the results from regional workshops","Janssen, M.F.W.H.A.; Van der Duin, P.; Wagenaar, R.W.; Bicking, M.; Wimmer, M.A.; Dawes, S.; Petrauskas, R.","","2007","E-government research is currently at a stage of consolidation and new orientation. Smaller steps of government modernization have in part been successfully implemented; larger ones still lie ahead of us. Within an EC funded project, a roadmap for egovernment is being defined. Thereby, scenario building about the future is being used to grasp pictures of the future. From these future scenarios, research actions shall be derived. In this paper we present the results of the scenario building workshops in four regions for e-government in the year 2020. In total 15 scenarios were developed shaping aspects of different dimensions of alternative futures. A wide range of topics were addressed, varying from interoperability, division of power, corruption, cyber war to changing democratic systems, religious activities, participations and the role of individualisms in society. Next steps are to assess the scenario results in respect to the current EC agenda and to derive from there actions of research in order to ensure that desired futures will come true and that unwanted futures are being avoided.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:ad381cdd-5515-46c9-b328-381c2fb32bb8","http://resolver.tudelft.nl/uuid:ad381cdd-5515-46c9-b328-381c2fb32bb8","Experimental discrimination of plowing friction and shear friction","Kamminga, J.D.; Janssen, G.C.A.M.","","2007","","sliding friction; plowing; elastic recovery; scratch test; CrN coating","en","journal article","Springer","","","","","","","","Mechanical, Maritime and Materials Engineering","","","","",""
"uuid:982cec78-5363-4a96-9bcb-3601de9efa6a","http://resolver.tudelft.nl/uuid:982cec78-5363-4a96-9bcb-3601de9efa6a","Giant Optical Transmission of a Subwavelength Slit Optimized Using the Magnetic Field Phase","Janssen, O.T.A.; Urbach, H.P.; 't Hooft, G.W.","","2007","","","en","journal article","American Physical Society","","","","","","","","Applied Sciences","","","","",""
"uuid:29a5cb91-dfeb-49a6-9fd2-7ab467d54717","http://resolver.tudelft.nl/uuid:29a5cb91-dfeb-49a6-9fd2-7ab467d54717","Stress in tungsten carbide-diamond like carbon multilayer coatings","Pujada, B.R.; Tichelaar, F.D.; Janssen, G.C.A.M.","","2007","Tungsten carbide-diamond like carbon (WC-DLC) multilayer coatings have been prepared by sputter deposition from a tungsten-carbide target and periodic switching on and off of the reactive acetylene gas flow. The stress in the resulting WC-DLC multilayers has been studied by substrate curvature. Periodicity and microstructure have been studied by transmission electron microscopy. It has been observed that compressive stress in the multilayers decreases when the bilayer thickness is reduced. Results show a minimum compressive stress for bilayer thickness of around 5?nm. This behavior is discussed in terms of interface stress and mixing between layers.","tungsten compounds; diamond-like carbon; multilayers; internal stresses; crystal microstructure; transmission electron microscopy","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","Kavli Institute of Nanoscience","","","",""
"uuid:e5dea466-2037-4f2f-9c5e-a6275b7676f4","http://resolver.tudelft.nl/uuid:e5dea466-2037-4f2f-9c5e-a6275b7676f4","Shoaling and shoreline dissipation of low?frequency waves","Van Dongeren, A.; Battjes, J.A.; Janssen, T.; Van Noorloos, J.; Steenhauer, K.; Steenbergen, G.; Reniers, A.","","2007","The growth rate, shoreline reflection, and dissipation of low?frequency waves are investigated using data obtained from physical experiments in the Delft University of Technology research flume and by parameter variation using the numerical model Delft3D?SurfBeat. The growth rate of the shoaling incoming long wave varies with depth with an exponent between 0.25 and 2.5. The exponent depends on a dimensionless normalized bed slope parameter ?, which distinguishes between a mild?slope regime and a steep?slope regime. This dependency on ? alone is valid if the forcing short waves are not in shallow water; that is, the forcing is off?resonant. The ? parameter also controls the reflection coefficient at the shoreline because for small values of ?, long waves are shown to break. In this mild?slope regime the dissipation due to breaking of the long waves in the vicinity of the shoreline is much higher than the dissipation due to bottom friction, confirming the findings of Thomson et al. (2006) and Henderson et al. (2006). The energy transfer from low frequencies to higher frequencies is partly due to triad interactions between low? and high?frequency waves but with decreasing depth is increasingly dominated by long?wave self?self interactions, which cause the long?wave front to steepen up and eventually break. The role of the breaking process in the near?shore evolution of the long waves is experimentally confirmed by observations of monochromatic free long waves propagating on a plane sloping beach, which shows strikingly similar characteristics, including the steepening and breaking.","low-frequency waves; subharmonic gravity waves; long waves; surf beat; wave generation; laboratory experiments","en","journal article","American Geophysical Union","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:83e3409c-2ec4-4f43-a644-2cb25a2c2118","http://resolver.tudelft.nl/uuid:83e3409c-2ec4-4f43-a644-2cb25a2c2118","Harde deklagen, een zaak van economie","Janssen, G.C.A.M.","","2007","","Intreerede","en","public lecture","","","","","","","","","Applied Sciences","","","","",""
"uuid:f77e42e4-e6ca-4e77-b099-f45e6436b09a","http://resolver.tudelft.nl/uuid:f77e42e4-e6ca-4e77-b099-f45e6436b09a","Exploring the service-oriented enterprise: Drawing lessons from a case study","Janssen, M.F.W.H.A.","","2008","The service-oriented enterprise (SOE) is often considered as the future model of organization. Yet there is little empirical research in this domain and limited insight into the benefits and disadvantages. In this paper we analyze a case study of a large, multinational banking company. This company is modularized in functions and business domains and organized around service centers. We found that the SOE emerges and evolves from the implementation of new projects. New banking products and services can be created by deploying service centers. Our finding shows that a service-oriented structure has advantages concerning the timeto- market of products, reduction of duplicate activities and systems, and clarity of the governance structure. Nevertheless many of the expected benefits are not proven the SOE has a number of disadvantages that need to be dealt with.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:df292dcc-59ba-4144-bff0-93fdfcbbf3b2","http://resolver.tudelft.nl/uuid:df292dcc-59ba-4144-bff0-93fdfcbbf3b2","Future e-government research: 13 research themes identified in the eGovRTD2020 project","Wimmer, M.; Codagnone, C.; Janssen, M.F.W.H.A.","","2008","E-government research has become a recognized research domain and many policies and strategies are formulated for e-government implementations. Most of these target the next few years and limited attention has been giving to the long term. The eGovRTD2020, a European Commission co-funded project, investigated the future research on e-government driven by changing circumstances and the evolution of technology. This project consists of an analysis of the state of play, a scenario-building, a gap analysis and a roadmapping activity. In this paper the roadmapping methodology fitting the unique characteristics of the e-government field is presented and the results are briefly discussed. The use of this methodology has resulted in the identification of a large number of e-government research themes. It was found that a roadmapping methodology should match the unique characteristics of e-government. The research shows the need of multidisciplinary research.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:6abc1df9-2b05-40d4-b5f9-f52f9d05154a","http://resolver.tudelft.nl/uuid:6abc1df9-2b05-40d4-b5f9-f52f9d05154a","Extended Nijboer-Zernike (ENZ) based mask imaging: Efficient coupling of electromagnetic field solvers and the ENZ imaging algorithm","Janssen, O.T.A.; Van Haver, S.; Janssen, A.J.E.M.; Braat, J.J.M.; Urbach, H.P.; Pereira, S.F.","","2008","Results are presented of mask imaging using the Extended Nijboer-Zernike (ENZ) theory of diffraction. We show that the efficiency of a mask imaging algorithm, derived from this theory, can be increased. By adjusting the basic Finite Difference Time Domain (FDTD) algorithm, we can calculate the near field of isolated mask structures efficiently, without resorting to periodic domains. In addition, the calculations for the points on the entrance sphere of the imaging system can be done separately with a Fourier transformed Stratton-Chu nearto-far-field transformation. By clever sampling in the radial direction of the entrance pupil, the computational effort is already reduced by at least a factor of 4.","mask imaging; Extended Nijboer-Zernike theory; puplil sampling; Stratton-Chu; FDTD","en","conference paper","SPIE","","","","","","","","Applied Sciences","?IST-Optics Research Groep","","","",""
"uuid:730e0dd1-a6d1-4f59-b068-8fa7bb85095a","http://resolver.tudelft.nl/uuid:730e0dd1-a6d1-4f59-b068-8fa7bb85095a","Evolution of ocean wave statistics in shallow water: Refraction and diffraction over seafloor topography","Janssen, T.T.; Herbers, T.H.C.; Battjes, J.A.","","2008","We present a stochastic model for the evolution of random ocean surface waves in coastal waters with complex seafloor topography. First, we derive a deterministic coupled-mode model based on a forward scattering approximation of the nonlinear mild slope equation; this model describes the evolution of random, directionally spread waves over fully two-dimensional topography, while accounting for wide angle refraction/diffraction, and quadratic nonlinear coupling. On the basis of the deterministic evolution equations, we derive transport equations for the wave statistical moments. This stochastic model evolves the complete wave cross-correlation matrix and thus resolves spatially coherent wave interference patterns induced by topographic scattering as well as nonlinear energy transfers to higher and lower frequencies. In this paper we focus on the linear aspects of the interaction with seafloor topography. Comparison to analytic solutions and laboratory observations confirms that (1) the forward scattering approximation is suitable for realistic two-dimensional topography, and (2) the combined effects of wide angle refraction and diffraction are accurately captured by the stochastic model.","wave statistics; stochastic; refraction and diffraction","en","journal article","American Geophysical Union","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:c79b87fb-e3af-4d5f-9f66-764632ff985f","http://resolver.tudelft.nl/uuid:c79b87fb-e3af-4d5f-9f66-764632ff985f","General imaging of advanced 3D mask objects based on the fully-vectorial Extended Nijboer-Zernike (ENZ) theory","Van Haver, S.; Janssen, O.T.A.; Braat, J.J.M.; Janssen, A.J.E.M.; Urbach, H.P.; Pereira, S.F.","","2008","In this paper we introduce a new mask imaging algorithm that is based on the source point integration method (or Abbe method). The method presented here distinguishes itself from existing methods by exploiting the through-focus imaging feature of the Extended Nijboer-Zernike (ENZ) theory of diffraction. An introduction to ENZ-theory and its application in general imaging is provided after which we describe the mask imaging scheme that can be derived from it. The remainder of the paper is devoted to illustrating the advantages of the new method over existing methods (Hopkins-based). To this extent several simulation results are included that illustrate advantages arising from: the accurate incorporation of isolated structures, the rigorous treatment of the object (mask topography) and the fully vectorial through-focus image formation of the ENZ-based algorithm.","mask imaging; Extended Nijboer-Zernike (EZN); mask topography effects; Abbe method; vectorial; non-periodic objects; FDTD","en","conference paper","SPIE","","","","","","","","Applied Sciences","?IST-Optics Research Groep","","","",""
"uuid:4136a843-147b-41bc-bced-099564aa21ed","http://resolver.tudelft.nl/uuid:4136a843-147b-41bc-bced-099564aa21ed","Microbiological analysis of the population of extremely haloalkaliphilic sulfur-oxidizing bacteria dominating in lab-scale sulfide-removing bioreactors","Sorokin, D.Y.; Van den Bosch, P.L.F.; Abbas, B.; Janssen, A.J.H.; Muyzer, G.","","2008","Thiopaq biotechnology for partial sulfide oxidation to elemental sulfur is an efficient way to remove H2S from biogases. However, its application for high-pressure natural gas desulfurization needs upgrading. Particularly, an increase in alkalinity of the scrubbing liquid is required. Therefore, the feasibility of sulfide oxidation into elemental sulfur under oxygen limitation was tested at extremely haloalkaline conditions in lab-scale bioreactors using mix sediments from hypersaline soda lakes as inoculum. The microbiological analysis, both culture dependent and independent, of the successfully operating bioreactors revealed a domination of obligately chemolithoautotrophic and extremely haloalkaliphilic sulfur-oxidizing bacteria belonging to the genus Thioalkalivibrio. Two subgroups were recognized among the isolates. The subgroup enriched from the reactors operating at pH 10 clustered with Thioalkalivibrio jannaschii–Thioalkalivibrio versutus core group of the genus Thioalkalivibrio. Another subgroup, obtained mostly with sulfide as substrate and at lower pH, belonged to the cluster of facultatively alkaliphilic Thioalkalivibrio halophilus. Overall, the results clearly indicate a large potential of the genus Thiolalkalivibrio to efficiently oxidize sulfide at extremely haloalkaline conditions, which makes it suitable for application in the natural gas desulfurization","Thiopaq; Sulfide removal; Haloalkaliphilic; Sulfur-oxidizing bacteria (SOB); Soda lakes; Polysulfide; Thioalkalivibrio","en","journal article","Springer","","","","","","","","Applied Sciences","Biotechnology","","","",""
"uuid:ccb63d59-2ddd-48a9-b354-4acf6d701201","http://resolver.tudelft.nl/uuid:ccb63d59-2ddd-48a9-b354-4acf6d701201","Link Budget Analysis and Modeling of Short-Range UWB Channels","Irahhauten, Z.; Dacuna, J.; Janssen, G.J.M.; Nikookar, H.; Yarovoy, A.G.; Ligthart, L.P.","","2008","Ultrawideband (UWB) technology is an attractive alternative for short-range applications, e.g., wireless personal area networks. In these applications, transmit and receive antennas are very close to each other and the far-field condition assumed in most of the link budget models may not be satisfied. Under near-field conditions, variations in the link budget and pulse shape compared to the far-field can be observed. In this work, a novel line-of-sight UWB link budget model for very short distances is proposed and validated with measurements using different types of antennas. The proposed model, which takes into account all main near-field effects (i.e., phase error, antenna mismatch and reradiation between antennas) and includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements. This model has also been applied to dispersive antennas (e.g., notch-antennas), and can be used in the design and analysis of short-range UWB communication systems.","link budget; near-field measurements; ultrawideband (UWB) antenna; UWB propagation channel","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics & Computer Engineering","","","",""
"uuid:1d7d602e-6a4b-407e-bcc2-8c9f44e4d9d2","http://resolver.tudelft.nl/uuid:1d7d602e-6a4b-407e-bcc2-8c9f44e4d9d2","Photoluminescence enhancement in thin films of PbSe nanocrystals","Christova, C.G.; Stouwdam, J.W.; Eijkemans, T.J.; Silov, A.Y.; Van der Heijden, R.W.; Kemerink, M.; Janssen, R.A.J.; Salemink, H.W.M.","","2008","Remarkable photoluminescence enhancement (PLE) in submonolayer films of PbSe nanocrystals (NCs) upon continuous illumination was observed. The intensity increase from films on InP substrates was highest in vacuum, while for films on Si/SiO2 substrates the PLE was stronger in air. The magnitude of the PLE was found to depend on the excitation intensity, being higher for a weaker irradiation power. The possible mechanisms behind the phenomenon of the PLE are discussed and it is suggested to originate mainly from charge trapping outside the NCs core.","excited states; IV-VI semiconductors; lead compounds; monolayers; nanostructured materials; nanotechnology; photoluminescence; semiconductor thin films","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","Kavli Institute of Nanoscience","","","",""
"uuid:5ccbde39-2e27-4b0c-b031-e6025897f488","http://resolver.tudelft.nl/uuid:5ccbde39-2e27-4b0c-b031-e6025897f488","Improving Government service delivery with private sector intermediaries","Klievink, B.; Janssen, M.","","2008","Government organizations operate a variety of channels to interact with citizens and businesses. Advances in information and communication technology enabled an online presence and more direct interactions. A focus on efficiency makes organizations encourage the use of electronic channels over traditional channels. Also, intermediaries in the service delivery chain are cut out in favor of direct interactions. This strategy of disintermediation finds its rationale in the transaction costs theory. In this paper we investigate dis- and re-intermediation strategies in the multi-channel management (MCM) structures of government organizations and found that disintermediation is not always the best option. Intermediaries – public or private – can be employed to improve customer-oriented service delivery. A primary focus on direct interaction neglects the potential added value of intermediaries. Both disintermediation and re-intermediation should be part of a conscious MCM service strategy. We present a case in which both dis- and re-intermediation are part of the MCM service strategy. In the case, a major Dutch organization took a radical approach to increase efficiency and improve the quality of its services. The organization redesigned the business network and reconfigured its service channels. We found that the disintermediation of low-performing channels, while re-intermediation in others, can contribute to both increased efficiency and better customer-oriented service delivery.","e-government; service provisioning; intermediation; public-private cooperation; multi-channel strategy","en","journal article","epractice.eu","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:b6dad6bc-be80-4615-b428-437d57c53f43","http://resolver.tudelft.nl/uuid:b6dad6bc-be80-4615-b428-437d57c53f43","Modeling Distance and Bandwidth Dependency of TOA-Based UWB Ranging Error for Positioning","Bellusci, G.; Janssen, G.J.M.; Yan, J.; Tiberius, C.C.J.M.","","2009","A statistical model for the range error provided by TOA estimation using UWB signals is given, based on UWB channel measurements between 3.1 and 10.6?GHz. The range error has been modeled as a Gaussian random variable for LOS and as a combination of a Gaussian and an exponential random variable for NLOS. The distance and bandwidth dependency of both the mean and the standard deviation of the range error has been analyzed, and insight is given in the different phenomena which affect the estimation accuracy. A possible application of the model to weighted least squares positioning is finally investigated. Noticeable improvements compared to the traditional least squares method have been obtained.","","en","journal article","Hindawi Publishing Corporation","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:68cebf26-f6a5-4022-9e17-d2faccd43d27","http://resolver.tudelft.nl/uuid:68cebf26-f6a5-4022-9e17-d2faccd43d27","Service Composition in Public Networks: Results from a quasi-experiment","Feenstra, R.; Janssen, M.F.W.H.A.","","2009","New systems can be created by assembling a set of elementary services provided by various stakeholders in a service composition. Service composition is not a trivial endeavor and several composition methods exist. Yet, these methods are hardly adopted by the field, as they need a set of well-defined and welldescribed services and are not able to deal with incomplete information and unambiguous descriptions. Furthermore, these methods are not able to deal with situations in which stakeholders have different requirements and need to negotiate with each other about the selection and performance of services. In this paper we present a service composition method and evaluate this method using a quasi-experimental design. The method is aimed at dealing with a set of heterogeneous services provided by stakeholders with different and sometimes even opposing requirements. We found that our composition method helps to create an overview of services and their attributes and enables better communication between stakeholders. A recommendation for further research is to integrate semantic and multi-actor composition methods.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:d53e54f2-43c7-46d8-b71b-b61796c83b85","http://resolver.tudelft.nl/uuid:d53e54f2-43c7-46d8-b71b-b61796c83b85","Growth stress in tungsten carbide-diamond-like carbon coatings","Pujada, B.R.; Tichelaar, F.D.; Arnoldbik, W.M.; Sloof, W.G.; Janssen, G.C.A.M.","","2009","Growth stress in tungsten carbide-diamond-like carbon coatings, sputter deposited in a reactive argon/acetylene plasma, has been studied as a function of the acetylene partial pressure. Stress and microstructure have been investigated by wafer curvature and transmission electron microscopy (TEM) whereas composition and energy distribution functions of positive ions were obtained by electron probe microanalyzer, elastic recoil detection analysis, and mass-energy analyzer (MEA). It has been observed that the compressive stress decreases with increasing acetylene partial pressure, showing an abrupt change from ?5.0 to ?1.6 GPa at an acetylene partial pressure of 0.012 Pa. TEM micrographs show that by increasing the acetylene partial pressure in the plasma from 0 to 0.012 Pa, the microstructure of the coating changes from polycrystalline to amorphous. MEA results show that the most probable energy of positive ions bombarding the substrate during deposition in pure argon and argon/acetylene atmosphere is the same. Based on the results, it is concluded that the huge variation in the compressive stress at low acetylene partial pressures is due to a change in the microstructure of the coating from polycrystalline to amorphous and not to the energy of positive ions bombarding the film.","coating techniques; compressibility; crystal microstructure; diamond-like carbon; electron probe analysis; ion microprobe analysis; phase transformations; silicon; sputtered coatings; surface structure; thin films; tungsten alloys","en","journal article","American Institute of Physics","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Science and Engineering","","","",""
"uuid:75801175-8b67-453c-b496-933175a04b76","http://resolver.tudelft.nl/uuid:75801175-8b67-453c-b496-933175a04b76","Building the Next Generation of Digital Government Infrastructures","Janssen, M.F.W.H.A.; Chun, S.A.; Gil-Garcia, J.R.","","2009","Digital Government Infrastructures provide generic functionalities that are used by large numbers of users. Typically, they have no central authority, are governed by networks and contain both emerging and purposefully designed parts. Their use varies over time, and a large number of individuals use them for different purposes. The basic digital government infrastructure has evolved over time and the development towards the next generation of digital government infrastructure (NGI) is under development. In this introduction, we discuss aspects of infrastructure development and this special issue contains papers contributing to the development of the NGI in various fields including customs, crisis management, legislation and regulation, providing a number of possible functions and services that may become part of the NGI. We argue that policy-makers should view the NGI from a complex-adaptive systems (CAS) view and that the next generation of infrastructures will provide not only technological services, including connectivity and security, but also shared information and knowledge in various fields, thus making it easier to participate, translate legislation and manage collaboration between public and private parties and in this way advancing digital government.","infrastructure; Digital Government; Complex Adaptive System; Enterprise Architecture; emerge","en","journal article","Elsevier","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:b1401518-dab5-4e88-89f8-4d8b29054862","http://resolver.tudelft.nl/uuid:b1401518-dab5-4e88-89f8-4d8b29054862","Realizing joined-up government: Dynamic capabilities and stage models for transformation","Klievink, B.; Janssen, M.","","2009","Joining up remains a high priority on the e-government agenda and requires extensive transformation. Stage models are predictable patterns which exist in the growth of organizations and unfold as discrete time periods that result in discontinuity and can help e-government development towards joined-up government. Although stage models may be conceptually appealing, these models are often not empirically validated, do not transcend the level of individual organizations, and provide little practical support to policymakers. Furthermore, they do not include the dynamic capabilities needed by organizations to transform from one stage to the next stage. In this paper, a five-stage model is presented that describes the progression from stove-piped situations towards a nationwide, customer-oriented, and joined-up government. The dynamic capabilities needed for realizing each stage are identified. This model is empirically validated and helps government agencies benchmark their position, realize their role in the formation of a joined-up government, develop the necessary capabilities, and adopt centrally developed infrastructural facilities aimed at moving to the next stage. We found that growth stages are useful for providing guidance and can be used by policymakers to stimulate the developments of capabilities needed by organizations to migrate from one stage to another","stage models; joined-up government; service provisioning; coordination; dynamic capabilities; transformation","en","journal article","Elsevier","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:4b8d759c-18b3-42d6-ae16-492e96ef5a20","http://resolver.tudelft.nl/uuid:4b8d759c-18b3-42d6-ae16-492e96ef5a20","Vectorial aerial-image computations of three-dimensional objects based on the extended Nijboer–Zernike theory","Van Haver, S.; Braat, J.J.M.; Janssen, A.J.E.M.; Janssen, O.T.A.; Pereira, S.F.","","2009","We present details of a novel imaging algorithm based on the extended Nijboer–Zernike (ENZ) theory of diffraction. We derive integral expressions relating the electric field distribution in the entrance pupil of an optical system to the electric field in its focal region. The evaluation of these integrals is made possible by means of a highly accurate and efficient series expansion similar to those occurring in standard ENZ theory. Based on these results an ENZ imaging scheme is constructed and evaluated in detail with attention to the convergence properties and computational complexity of the new method.","diffraction theory; image formation theory; aberration expansions; computational electromagnetic methods; computational imaging; three-dimensional lithography","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:df8fa67b-8cd3-417d-ac37-a48256f09fc3","http://resolver.tudelft.nl/uuid:df8fa67b-8cd3-417d-ac37-a48256f09fc3","Advances in multi-agency disaster management: Key elements in disaster research","Janssen, M.; Lee, J.; Bharosa, N.; Cresswell, A.","","2009","Multi-agency disaster management requires collaboration among geographically distributed public and private organizations to enable a rapid and effective response to an unexpected event. Many disaster management systems often lack the capability to cope with the complexity and uncertainty. In this introduction to the special issues on advances in multi-agency disaster management we discuss the role of information, enterprise architecture, coordination and related human efforts aimed at improving multi-agency disaster management. The paper concludes that although there is a common body of knowledge, disaster management is still an under-developed area. There is a need to relate practice and theory by using human-centered approaches such that disaster management can realize its full potential.","Coordination; Enterprise architecture; Disaster management; Adaptivity","en","journal article","Springer","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:6978bd80-132c-4323-a736-2485aca5cf37","http://resolver.tudelft.nl/uuid:6978bd80-132c-4323-a736-2485aca5cf37","Challenges and obstacles in sharing and coordinating information during multi-agency disaster response: Propositions from field exercises","Bharosa, N.; Lee, J.; Janssen, M.","","2009","Although various scholars have researched issues regarding disaster management, few have studied the sharing and coordinating of information during disasters. Not much empirical data is available in this field and there is sparse insight into the factors that may impede or facilitate information sharing and coordination among stakeholders. In this paper, we provide an overview of the relevant obstacles and challenges by examining existing literature and then investigating a series of multi-agency disaster management exercises, using observations and a survey. Although all the people who took part in our study agree that sharing information is important, for the success of their own organization as well as the exercise as a whole, the extent to which information is actually being shared among organizations is often limited by a number of factors that can be attributed to the community, agency and individual level. We found that relief workers are often more concerned with receiving information from others than with providing information to others who may benefit. Incentives for sharing information, understanding each other’s work-processes and the usability of information systems have shown positive effects on information sharing and coordination. The findings of our study have been formulated using six grounded propositions, which can be used by system designers and policy-makers upon validation in further research. We also provide directions for future research.","Coordination; Information sharing; Crisis; Field exercise; System design","en","journal article","Springer","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:bf6a030b-945c-4635-a856-cb7e8a7cc407","http://resolver.tudelft.nl/uuid:bf6a030b-945c-4635-a856-cb7e8a7cc407","Reconsidering information management roles and capabilities in disaster response decision-making units","Bharosa, N.; Janssen, M.F.W.H.A.","","2009","When disaster strikes, the emerging task environment requires relief agencies to transform from autonomous mono-disciplinary organizations into interdependent multidisciplinary decision-making units. Evaluation studies reveal that adaptation of information management to the changing task environment is difficult resulting in poor information quality, indicating information was incorrect, outdated or even unavailable to relief workers. In this paper, we adopt a theory-driven approach to develop a set of information management roles and dynamic capabilities for disaster management. Building on the principles of advance structuring and dynamic adjustment, we develop a set of roles and capabilities, which we illustrate and extend using two field studies in the Netherlands. By studying regional relief workers in action, we found that in tactical disaster response decisionmaking units, several information management roles are not addressed and that information managers are preoccupied with information gathering and reporting, whereas information quality assurance is not on the agenda.","information architecture; information management; adaptivity; roles; dynamic capabilities","en","conference paper","ISCRAM","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:b69bc487-338e-4951-b1f7-3c73dcfd9045","http://resolver.tudelft.nl/uuid:b69bc487-338e-4951-b1f7-3c73dcfd9045","Uncertainty from Model Calibration: Applying a New Method to Transport Energy Demand Modelling","Ruijven, B.; Van der Sluijs, J.P.; Van Vuuren, D.P.; Janssen, P.; Heuberger, P.S.C.; De Vries, B.","","2009","Uncertainties in energy demand modelling originate from both limited understanding of the real-world system and a lack of data for model development, calibration and validation. These uncertainties allow for the development of different models, but also leave room for different calibrations of a single model. Here, an automated model calibration procedure was developed and tested for transport sector energy use modelling in the TIMER 2.0 global energy model. This model describes energy use on the basis of activity levels, structural change and autonomous and priceinduced energy efficiency improvements. We found that the model could reasonably reproduce historic data under different sets of parameter values, leading to different projections of future energy demand levels. Projected energy use for 2030 shows a range of 44–95% around the best-fit projection. Two different model interpretations of the past can generally be distinguished: (1) high useful energy intensity and major energy efficiency improvements or (2) low useful energy intensity and little efficiency improvement. Generally, the first lead to higher future energy demand levels than the second, but model and insights do not provide decisive arguments to attribute a higher likelihood to one of the alternatives.","Model calibration; Uncertainty; Global energy model; Transport energy use","en","journal article","Springer","","","","","","","","Mechanical, Maritime and Materials Engineering","Delft Center for Systems and Control","","","",""
"uuid:2f45caba-b002-4c16-b730-99d24762b377","http://resolver.tudelft.nl/uuid:2f45caba-b002-4c16-b730-99d24762b377","Delta: Participatie en social learning in de Delta: Deelresultaat 5 Pilot ""Zuidwest-Brabant, Reigersbergsche polder en Zuid-Beverland""","Bouma, G.; Janssen, S.; Hommes, S.; Otter, H.; Reijs, T.; Woestenburg, A.","","2009","In deze deelrapportage wordt de tweede pilot van het project Delta: ""Zuidwest-Brabant, Reigersbergsche polder en Zuid-Beverland"", beschreven en Geëvalureerd. Deze tweede pilot heeft het karakter van een 'validatie pilot' binnen het Leven met Water project Delta. De activiteiten die in de eerste pilot Tholen/St. Philipsland zijn uitgevoerd, zijn samen met de lessen die getrokken zijn uit de evaluaties van Tholen/St. Philipsland, het referentiekader voor deze tweede pilot. Daarbij is het van te voren helder dat elke pilot zijn eigen context kent en het woord validatie daarom niet geheel op zijn plaats is. Bovendien is de tijdsperiode die verlopen is tussen de twee pilots, vanwege bestuurlijk overleg in de Deltaraad, veel langer dan bij de start van het project verwacht werd.","Delft Cluster; Delta; CT07.30; Zuidwest-Brabant; CT07.30.00; Reigersbergsche polder; Zuid-Beverland; pilot; partcipatie en social learning","nl","report","","","","","","","","","","","","","",""
"uuid:8ffc2610-093a-4a32-b9a5-7fec5325db83","http://resolver.tudelft.nl/uuid:8ffc2610-093a-4a32-b9a5-7fec5325db83","Delta: Participatie en social learning in de Delta: Deelresultaat 6 Eindrapportage ""Participatie en social learning in de Delta""","Hommes, S.; Otter, H.; Reijs, T.; Janssen, S.; Bouma, G.","","2009","Voor u ligt de eindrapportage van het Leven met Water project 'Delta' richt zich op de wijze waarop belanghebbenden optimaal kunnen worden betrokken bij de planvorming voor het waterwaterbeheer in de Zuidwestelijke Delta en hoe hiermee een proces van 'social learning' kan worden doorlopen. In de Delta zijn diverse ontwikkelingen en studies gaande die de klimaatbestendigheid en duurzaamheid voor de toekomst verkennen. Een van de acties betreft de Brede Discussie rondom zoetwaterbeschikbaarheid.","Delft Cluster; leven met water; Delta; participatie en social learning; CT07.30; zoetwaterbeschikbaarheid; CT07.30.00","nl","report","Delft Cluster","","","","","","","","","","","","",""
"uuid:714e7c88-7b13-494b-9d31-256552d3e680","http://resolver.tudelft.nl/uuid:714e7c88-7b13-494b-9d31-256552d3e680","A Flexible, Event-Driven, Service-Oriented Architecture for Orchestrating Service Delivery","Overbeek, S.; Klievink, B.; Janssen, M.","","2009","This event-driven architecture uses decentralized intelligence to orchestrate services across a network of public agencies, without compromising the individual agencies' autonomy.","EDSOA; e-government; integrated service delivery; interoperability; ontology; service composition","en","journal article","IEEE","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:aa876c80-2984-4544-a812-52a8c87beee6","http://resolver.tudelft.nl/uuid:aa876c80-2984-4544-a812-52a8c87beee6","BER analysis for MPAM signal constellations in the presence of fading and ADC quantization noise","Rizvi, U.H.; Janssen, G.J.M.; Weber, J.H.","","2009","In this letter, closed-form expressions for the bit error rate of M-ary pulse amplitude modulated signal constellations as a function of the analog-to-digital converter word length, the signal-to-noise ratio and the fading distribution, are derived. These results allow for a rapid and accurate evaluation of the system performance when the analog-to-digital converter resolution is limited, as is generally the case in high sampling rate communication systems, and thus provide a useful tool for system design, analysis and optimization.","ADC quantization noise; BER analysis; Nakagami fading and RF system design","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:27ba0099-0df0-44ee-baae-ac5bfe2370bc","http://resolver.tudelft.nl/uuid:27ba0099-0df0-44ee-baae-ac5bfe2370bc","Renewal of the base model for geographic information of the Netherlands","Quak, C.W.; Janssen, P.; Reuvers, M.","","2009","In 2005 a base model for geographic information in the Netherlands was published named NEN 3610. The model consist of a modeling framework (based on the ISO19100 series) and a collection of extensible base classes. In the following years many organizations have built their models in conformance to this base model (IMRO, TOP10NL, IMTOP, IMWA, IMKICH, IMKL). The implementation of the base model strongly enhances the operational aspect of a successful National Geographic Register and related services. Moreover the base model approach has prepared the Netherlands for implementation of a similar approach followed in the INSPIRE initiative. Based on the experiences and national and international developments we are renewing the base model, this will be finished in 2009. In our paper we share our experiences with the base model of the last few years and give an overview of our proposed changes. The changes come from the following three main sources: NEN 3610 users were asked for change proposals, all current NEN 3610 models were analyzed for harmonization opportunities and finally the INSPIRE specifications that will probably influence many datasets under NEN 3610 were checked. Al these proposals were discussed in a NEN 3610 Framework group resulting in a new version of base model. The most notable changes with respect to the old version are: The introduction of design patterns as a way to harmonize data models. How to handle the fact that all organizations have a different way of looking at the world and hence splitting the same world into different classes. Integration of semantic decisions and implementation decisions in one model. As there are many similarities between the Dutch base model developments and the INSPIRE process we believe that conclusions from this project can be of benefit for the INSPIRE project and vice-versa.","INSPIRE; SDI; UML","en","conference paper","GSDI Association","","","","","","","","OTB Research Institute","GIS Technology","","","",""
"uuid:9ec7bc4b-7f08-408c-9e26-ffe6436215f1","http://resolver.tudelft.nl/uuid:9ec7bc4b-7f08-408c-9e26-ffe6436215f1","Strategies for Orchestrating and Managing Supply Chains in Public Service Networks","Van Veenstra, A.F.; Janssen, M.F.W.H.A.; Klievink, B.","","2009","Joining-up is high on the e-government agenda as this is expected to improve service delivery to citizens and businesses. It requires public and private organizations to cooperate with each other within networks that are formed around public services that cross the boundaries of organizations. Cross-organizational processes in such a network are called supply chains, aimed at delivering integrated services. The performance of each individual organization within the network influences aspects such as lead-time and quality of services delivered. In order to effectively integrate the efforts of the various organizations involved, a strategy needs to be in place to orchestrate and manage a service delivery chain. Various types of strategies can be employed. Yet little knowledge is available about which strategies are effective under which circumstances. In this paper we identify four different strategies for managing and orchestrating cross-organizational service chains. These supply chain management (SCM) strategies are based on literature research and case study analysis. The four strategies are identified based on two dimensions: the level of control (i.e. governance structure) and the architectural approach for systems integration. These four strategies are: merger, orchestra, relay race, and broadcasting. For three of the four strategies, illustrative cases have been found. The strategy selection depends on factors such as the institutional environment, political ambitions and organizational readiness. Furthermore, each strategy has its own merits and demerits. We recommend investigating the relationship between situational characteristics and SCM strategies in further research.","e-government; joined-up government; Supply Chain Management; inter-organizational collaboration; governance; integration strategy","en","journal article","Academic Publishing Limited","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:6b235962-7115-410e-a14f-e2d6baf11f9a","http://resolver.tudelft.nl/uuid:6b235962-7115-410e-a14f-e2d6baf11f9a","Simulation Gaming as a Social Development Instrument: Dealing with Complex Problems","Klievink, B.; Janssen, M.","","2010","Improving public service delivery is a very complex domain and the complexity is difficult to grasp by stakeholders having various degree of knowledge and involvement. An emergent and promising method for dealing with complex problems is simulation gaming, which can be used to capitalize the intrinsic experiences and knowledge of people and mobilize their creativity to come up with new solutions. A simulation game refers to a situation in which human participants play a role and follow rules of play to simulate complex situations. We developed a simulation game for the field of public-private service delivery. The purpose of the game is to facilitate public organizations to get to the core of problems in service delivery and to stimulate the collaborative development of innovative solutions for public service delivery. Playing the game at a municipality shows that the game is suitable for creating awareness and for the identification and development of alternative solutions. The game can be used to substitute the “authoritative-know-all” approach by a “wisdom of the crowds” approach, incorporating the social collaboration that is a key concept in Web 2.0 thinking.","public services; E-government; public-private cooperation; simulation; gaming; co-creation; collaboration","en","journal article","IOS Press","","","","","","","","Technology, Policy and Management","ESS","","","",""
"uuid:ba060e61-ac29-442e-9cd8-d45cd2a02c4d","http://resolver.tudelft.nl/uuid:ba060e61-ac29-442e-9cd8-d45cd2a02c4d","Simulation games for collaborative development in e-Government","Klievink, B.; Janssen, M.F.W.H.A.","","2010","Governments aim to improve service delivery to citizens and businesses and need to transform to accomplish efficiency savings and better customer orientation. This requires the coordination of dependencies among the various departments located in the frontend and backend of organizations, and might include interdependencies with external parties. Transforming this fragmented landscape requires an understanding of issues at play, and the collaborative development of possible solutions. Every stakeholder has its own perspective, background, knowledge, and interests, and with their own situation and issues in mind, they often fail to grasp the bigger picture. Simulation games refer to a situation in which human participants play a role and follow certain rules to simulate a complex real-world phenomenon. Such a game can enhance participant’s understanding of the complexities involved in the big picture, which might facilitate improvement. In this paper we present and evaluate a simulation game for public service delivery. The game facilitates problem-oriented learning and collaborative improvement of public service delivery. We measured participant views on the success of the collaboration in multiple sessions, using observations and a survey. The analyses show that participants find the process of the game successful and are willing to commit resources to it.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:65512ae7-b38b-4b2c-8993-05317cbcf469","http://resolver.tudelft.nl/uuid:65512ae7-b38b-4b2c-8993-05317cbcf469","Extracting principles for information management adaptability during crisis response: A dynamic capability view","Bharosa, N.; Janssen, M.F.W.H.A.","","2010","During crises, relief agency commanders have to make decisions in a complex and uncertain environment, requiring them to continuously adapt to unforeseen environmental changes. In the process of adaptation, the commanders depend on information management systems for information. Yet there are still numerous reports of situations in which commanders had to make decisions based on incomplete, outdated or incorrect information, indicating poor information quality. In many of these situations, poor information quality can be attributed to the information management process incapable of adapting to external (environmental) changes and internal (team) information needs. Using dynamic capability theory and the findings of a case study, this paper presents four principles for information management adaptability: (1) maintain and update team memory, (2) dedicate resources for environmental scanning, (3) maximize the number of alternative information sources and (4) integrate forecasting and back casting methods in the information management process.","","en","conference paper","IEEE","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:11f1c9f9-93b6-4c80-9d13-2e7a49b1aa42","http://resolver.tudelft.nl/uuid:11f1c9f9-93b6-4c80-9d13-2e7a49b1aa42","Gaming and simulation for transforming and reengineering government: Towards a research agenda","Janssen, M.F.W.H.A.; Klievink, B.","","2010","Purpose – In the process of transformation, governments have to deal with a host of stakeholders and complex organizational and technical issues. In this viewpoint paper, an argument is made in favour of using gaming and simulation as tools designed to aid the transformation and reengineering of government. Based on the argument, a research agenda is proposed. Design/methodology/approach – The approach taken is a combination of literature research, argumentation and illustrations. Findings – Simulation and gaming have the potential to be used to activate and involve stakeholders at all layers of government in transformational efforts. These tools should be closely connected to visualization and interaction options, to facilitate communication and participation. Because the various stakeholders involved have different views and different approaches, it is both necessary and difficult to involve them in identifying problems and developing solutions. Given the considerable potential of these tools, more research is needed on the use and development of participative simulation and gaming tools. Research limitations/implications – Although gaming and simulation have been used in many domains, they have yet to be tried in the area of e-government. More research is needed into the instruments that can help governments in their transformation processes. Practical implications – E-government projects should be supported by tools such as gaming and simulation to facilitate the participation, involvement of and communication among the various relevant stakeholders, to create a shared understanding of the problems and of future scenarios. Originality/value – The primary value of this viewpoint lies in the analysis of the potential opportunities of gaming and simulation in terms of transforming and reengineering government and the research agenda that follows from this analysis. Paper type - Viewpoint","government; communication technologies; simulation; decision support systems; role play; research","en","journal article","Emerald Group Publishing Limited","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:f3f02dd0-0a60-4781-bdc9-87efa7036932","http://resolver.tudelft.nl/uuid:f3f02dd0-0a60-4781-bdc9-87efa7036932","From a discrete to a continuous model for interpulse interference with a frequency-comb laser","Zeitouny, M.G.; Cui, M.; Bhattacharya, N.; Urbach, H.P.; Van den Berg, S.A.; Janssen, A.J.E.M.","","2010","We have investigated correlation patterns generated by a frequency-comb laser in a dispersive unbalanced Michelson interferometer and apply the developed formalism to the case of distance metrology. Due to group velocity dispersion, the position of the brightest fringe of the correlation pattern, which is used for distance determination, cannot be derived by simply using the definition of group refractive index of the dispersive medium. It is shown that the discrete spectrum of the optical frequency comb gives rise to correlation functions which can be represented by a series, namely a discrete correlation series. We have developed a general formalism, valid for any pulse train, extending the discrete model to a continuous model of cross-correlation functions using the Poisson summation. Our model is relevant for any offset and repetition frequency of the frequency comb. From the continuous cross-correlation model we show that, even for a homogeneous dispersive medium the position of the brightest fringe varies nonlinearly for small delay distances and stabilizes for longer ones. We have compared the theoretical results to measurements of pulse propagation in air for path-lengths up to 200 m.","","en","journal article","American Physical Society","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:626629b7-81f4-4929-ae8d-c4290f2a218f","http://resolver.tudelft.nl/uuid:626629b7-81f4-4929-ae8d-c4290f2a218f","Beyond the horizon; flying next generation solar aircraft even further","Janssen, Y.","","2010","","","en","journal article","Society for Aerospace Engineering Students VSV Leonardo da Vinci","","","","","","","","Aerospace Engineering","","","","",""
"uuid:33f72f22-daea-4edf-977e-093273c05e6d","http://resolver.tudelft.nl/uuid:33f72f22-daea-4edf-977e-093273c05e6d","An integrated approach for financial and environmental cost optimisation of heating services","Debacker, W.; Allacker, K.; Delem, L.; Janssen, A.; De Troyer, F.; Spirinckx, C.; Geerken, T.; Van Dessel, J.","","2010","A four-year project has started in 2007 to develop a methodology that can be applied to optimize the Belgian dwelling stock. The aim of the project is to optimise buildings concerning their environmental impact, their financial cost and the quality they offer over the whole life cycle, from the production of primary raw materials to the final demolition and end-of-life treatment. In the first phase of the project the optimisation methodology is developed; i.e. environmental impacts are analysed by means of life cycle assessment (LCA); financial costs are calculated based on life cycle cost analyses (LCC); and the quality evaluation is based on multi-criteria analyses (MCA). The aim of the optimization is to realize the highest marginal quality improvement for the additional financial and environmental cost. In a second phase the developed methodology is translated into a work instrument and applied to different dwelling types. This paper goes more deeply into the role heating services play in the environmental and financial costs. For a typical Belgian dwelling initial and life cycle costs for commonly used as well as advanced heating configurations are compared. Since energy consumption for heating is dependent of the way the building envelope is built, the analysis is performed on two dwelling configurations with a different insulation level.","life cycle assessment; life cycle costing; element method; Pareto optimisation; heating services","en","conference paper","","","","","","","","","","","","","",""
"uuid:c2a93de0-21e4-490b-a18c-09f319c2da17","http://resolver.tudelft.nl/uuid:c2a93de0-21e4-490b-a18c-09f319c2da17","Rigorous simulations of emitting and non-emitting nano-optical structures","Janssen, O.T.A.","Urbach, H.P. (promotor)","2010","In the next decade, several applications of nanotechnology will change our lives. LED lighting is about to replace the common light bulb. The main advantages are its energy efficiency and long lifetime. LEDs can be much more efficient, when part of the emitted light that is currently trapped in the device, could be radiated out of the device. Other devices such as photovoltaic solar cells and biosensors can also be made more efficient and cheaper. LEDs, solar cells and biosensors have in common that they consist of small structures of the order of the wavelength of the light. With such small structures light can be manipulated in a special way. In this thesis, we describe a method to calculate the interaction of light with these small structures. It is shown that an efficient LED which radiates light, can be treated as a solar cell that absorbs as much of the incoming light as possible. On this so-called reciprocity principle, which was discovered by Henrik Antoon Lorentz, a very efficient computational optimalisation method can be based. With this method existing designs of for example LEDs can be made more efficient iteratively. This thesis shows optimized designs of LEDs, solar cells and biosensors.","FDTD; LED; plasmonics; optimization; reciprocity; biosensors","en","doctoral thesis","Optics Research Group","","","","","","","2010-11-09","Applied Sciences","Imaging Science & Technology","","","",""
"uuid:1a7fe364-7b94-424e-b915-1de0d14d80de","http://resolver.tudelft.nl/uuid:1a7fe364-7b94-424e-b915-1de0d14d80de","Efficient optimization method for the light extraction from periodically modulated LEDs using reciprocity","Janssen, O.T.A.; Wachters, A.J.H.; Urbach, H.P.","","2010","The incoherent emission of periodically structured Light Emitting Diodes (LEDs) can be computed at relatively low computational cost by applying the reciprocity method. We show that by another application of the reciprocity principle, the structure of the LED can be optimized to obtain a high emission. We demonstrate the method by optimizing one-dimensional grating structures. The optimized structures have twice the extraction efficiency of an optimized flat structure.","computational electromagnetic methods; diffraction gratings; photonic crystals; light-emitting diodes","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","Imaging Science and Technology","","","",""
"uuid:db74a0c5-a74d-4e14-be97-fec1065630a6","http://resolver.tudelft.nl/uuid:db74a0c5-a74d-4e14-be97-fec1065630a6","Method and device for signal time of arrival determination","Bellusci, G.; Janssen, G.J.M.","","2010","A method for determining a time-of-arrival of an input signal, includes receiving the input signal; generating a first time dependent signal with a first time dependence from the received 5 input signal; generating a second time dependent signal with a second time dependence from the received input signal, the first time dependence of the first time dependent signal being different from the second time dependence of the second time dependent signal; sampling at least once the first time dependent signal and the second time dependent 10 signal; determining a value of the time-of-arrival from theat least once sampled first time dependent signal and at least once sampled second time dependent signal.","","en","patent","European Patent Office","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Telecommunications","","","",""
"uuid:ad7e8c29-ed75-483b-a871-8d4a9503042f","http://resolver.tudelft.nl/uuid:ad7e8c29-ed75-483b-a871-8d4a9503042f","Harmonising Licences on a Global Level: Mission Impossible or Piece of Cake?","Janssen, Katleen (Katholieke Universiteit Leuven); van Loenen, B. (TU Delft Urban Data Science); Remetey-Fullopp, Gabor","","2011","","","en","conference paper","","","","","","","","","","","Urban Data Science","","",""
"uuid:1008d5f6-0ae4-47ec-8109-921721014a14","http://resolver.tudelft.nl/uuid:1008d5f6-0ae4-47ec-8109-921721014a14","Time-frequency distribution of interferograms from a frequency comb in dispersive media","Zeitouny, M.G.; Cui, M.; Janssen, A.J.; Bhattacharya, N.; Van den Berg, S.A.; Urbach, H.P.","","2011","We investigate general properties of the interferograms from a frequency comb laser in a non-linear dispersive medium. The focus is on interferograms at large delay distances and in particular on their broadening, the fringe formation and shape. It is observed that at large delay distances the interferograms spread linearly and that its shape is determined by the source spectral profile. It is also shown that each intensity point of the interferogram is formed by the contribution of one dominant stationary frequency. This stationary frequency is seen to vary as a function of the path length difference even within the interferogram. We also show that the contributing stationary frequency remains constant if the evolution of a particular fringe is followed in the successive interferograms found periodically at different path length differences. This can be used to measure very large distances in dispersive media.","correlators; spectrum analysis; interferometry; chirping; ultrafast spectroscopy","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","IST/Imaging Science and Technology","","","",""
"uuid:4d221f70-07ae-4fed-aa96-b6e761a3d37e","http://resolver.tudelft.nl/uuid:4d221f70-07ae-4fed-aa96-b6e761a3d37e","The applicability of the SUR measurement for ultrafiltration of WWTP effluent","Janssen, A.N.","Van der Graaf, J.H.J.M. (promotor)","2011","","ultrafiltration; WWTP effluent; fouling; SUR; filterability; reversibility","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","Watermanagement","","","",""
"uuid:17874149-43e8-4981-8b72-3e77b43ee38c","http://resolver.tudelft.nl/uuid:17874149-43e8-4981-8b72-3e77b43ee38c","A research agenda for information quality assurance in public safety networks: Information orchestration as the middle ground between hierarchical and netcentric approaches","Bharosa, N.; Janssen, M.; Tan, Y.H.","","2011","One of the key challenges in public safety networks is to ensure a high level of information quality (IQ) during disaster response. Since many evaluation reports on disaster response efforts have revealed instances of poor IQ, both academics and practitioners are in search of information architectures that assure IQ. This article focuses on the hurdles and opportunities for IQ assurance via information architectures. Drawing on two opposing coordination approaches, hierarchical versus netcentric, we suggest adopting a hybrid, information orchestration-based approach for assuring IQ. While hierarchical coordination approaches result in architectures dictating predefined information flows dependent on structures and procedures, netcentric information coordination emphasizes the need for individual self-synchronization driven by events. Even though both architectures have their strengths and weaknesses depending on several contingencies, both include characteristics that hamper IQ assurance for relief workers. Information orchestration offers the middle ground between hierarchical and netcentric approaches and defined as a heterarchical form of information coordination consisting of a specific set of roles and capabilities related to the collection, enrichment, and dissemination of highquality information. Capabilities that need to be developed according to the information orchestration approach constitute a research agenda.","Disaster management; Information quality; Netcentric orchestration; Public safety networks","en","journal article","Springer Verlag","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:2177953b-48b8-43ba-a05e-f375ed3a44d5","http://resolver.tudelft.nl/uuid:2177953b-48b8-43ba-a05e-f375ed3a44d5","Barriers and impediments to transformational government: Insights from literature and practice","Van Veenstra, A.F.; Klievink, B.; Janssen, M.F.W.H.A.","","2011","Transformational government (t-government) has been introduced as a new stage of e-government aimed at realising structural changes and greater benefits in the public sector. Yet, there are many impediments blocking transformation, and there is limited insight in these barriers. In this paper, impediments for t-government are investigated by conducting a literature review and carrying out three case studies. The impediments found in literature were confirmed and extended using the case studies. Impediments simultaneously occur on the governance, organisational and managerial, and technical level and need to be addressed in concert. Research on transformation can benefit from understanding these interrelated impediments.","e-government; t-government; transformation; impediments; barriers; process reengineering","en","journal article","Inderscience Publishers","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:fc718916-cecf-42a8-a3d9-0bb8c2c8fe02","http://resolver.tudelft.nl/uuid:fc718916-cecf-42a8-a3d9-0bb8c2c8fe02","Manufacturing double-curved elements in precast concrete using a flexible mould: First experimental results","Schipper, H.R.; Janssen, B.","","2011","The manufacturing of double-curved precast concrete elements is still expensive, due to the high costs and limited possibilities for repetitive use of the moulds or formwork. The goal of the research described in this paper is to develop a production method that overcomes these difficulties by enabling the mould to be reused many times and by making the shape of the mould adjustable in a flexible way. First the paper gives an introduction of free-form architecture and the issues related to realizing complex geometry in concrete. Sequentially, the paper reports on the structural mechanics models that have been developed to accurately describe the behaviour of a flexible mould material. Finally laboratory experiments are reported, that are based on the concept of deforming an initially flat concrete element into a curved shape after a short initial hardening period. After this deformation process further hardening will take place in the final curved shape. The advantages of starting with an initial flat layer are that no contra-mould is needed, the element thickness can be controlled accurately and the casting process is relatively quick and simple.","Precast; shells; panels; formwork; freeform; curved","en","conference paper","Czech Concrete Society and fib International Federation for Structural Concrete","","","","","","","2011-06-22","Civil Engineering and Geosciences","Design and Construction","","","",""
"uuid:f33f57c7-053a-453f-8efd-ffc468622712","http://resolver.tudelft.nl/uuid:f33f57c7-053a-453f-8efd-ffc468622712","Manufacturing Double Curved Precast Concrete Panels using a Flexible Mould","Schipper, H.R.; Janssen, B.","","2011","Free form architecture with complex geometry brings along new challenges for manufacturers of building components. This paper describes the application of structural mechanics to predict the behaviour of an elastic mould surface, used as formwork for the manufacturing of double curved panels in precast concrete. Results are presented of laboratory experiments with a formwork to validate the model. The authors demonstrate that the model together with the mould prototype enable a flexible yet straightforward production method for curved concrete products that is applicable in many free form architecture projects nowadays.","precast concrete; shells; panels; freeform; curved; flexible mould; adaptive formwork; splines","en","journal article","Ad-media GmbH Germany","","","","","","","","Civil Engineering and Geosciences","Structural and Building Engineering","","","",""
"uuid:859a68e7-4385-426d-bec8-a9efc01642ca","http://resolver.tudelft.nl/uuid:859a68e7-4385-426d-bec8-a9efc01642ca","Photon noise limited radiation detection with lens-antenna coupled microwave kinetic inductance detectors","Yates, S.J.C.; Baselmans, J.J.A.; Endo, A.; Janssen, R.M.J.; Ferrari, L.; Diener, P.; Baryshev, A.M.","","2011","Microwave kinetic inductance detectors (MKIDs) have shown great potential for sub-mm instrumentation because of the high scalability of the technology. Here, we demonstrate for the first time in the sub-mm band (0.1–2 mm) a photon noise limited performance of a small antenna coupled MKID detector array and we describe the relation between photon noise and MKID intrinsic generation-recombination noise. Additionally, we use the observed photon noise to measure the optical efficiency of detectors to be 0.8?±?0.2.","lens antennas; microwave detectors; noise; radiation detection","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","QN/Quantum Nanoscience","","","",""
"uuid:6e3f2612-ef42-4946-baba-7adff4a7ed7f","http://resolver.tudelft.nl/uuid:6e3f2612-ef42-4946-baba-7adff4a7ed7f","Curving Concrete: A Method for Manufacturing Double Curved Precast Concrete Panels using a Flexible Mould","Schipper, H.R.; Janssen, B.","","2011","Free form architecture with complex geometry brings along new challenges for manufacturers of building components. This paper describes the application of structural mechanics to predict the behaviour of an elastic mould surface, used as formwork for the manufacturing of double curved panels in precast concrete. Results are presented of laboratory experiments with a formwork to validate the model. The authors demonstrate that the model together with the mould prototype enable a flexible yet straightforward production method for curved concrete products that is applicable in many free form architecture projects nowadays.","precast concrete; shell; panel; formwork; freeform; curved; flexible mould; splines","en","conference paper","Hemming Group Ltd","","","","","","","","Civil Engineering and Geosciences","Structural and Building Engineering","","","",""
"uuid:3580c36a-a8b8-4c17-bd12-b5235831ffc0","http://resolver.tudelft.nl/uuid:3580c36a-a8b8-4c17-bd12-b5235831ffc0","Coherent interference and diffraction in random waves","Smit, P.B.; Janssen, T.T.","","2011","Wave fields traveling through a varying medium (e.g. topography, currents), can develop well-defined focal zones and caustics, where the wave field is highly coherent and wave statistics vary rapidly. However, the presence and evolution of such coherent structures in the wave field are not resolved in a quasi-homogeneous description of the wave field (e.g. the radiative transport equation), and a more general description of the wave statistics (and its evolution) is needed. In this work we demonstrate with numerical examples that, when using a (recently developed) transport equation for the second order inhomeogeneous wave statistics that accounts for cross-variance contributions, we can resolve coherent structures in wave fields such as those typically found in focal and diffraction zones. What this shows is, that in a statistical sense, diffraction is essentially an interference phenomenon that can be readily resolved if cross-phase information in the transport equations is retained.","","en","conference paper","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:a5e4f96c-7ff1-47e2-ae61-deb75728f438","http://resolver.tudelft.nl/uuid:a5e4f96c-7ff1-47e2-ae61-deb75728f438","Coupling Bright and Dark Plasmonic Lattice Resonances","Rodriguez, S.R.K.; Abass, A.; Maes, B.; Janssen, O.T.A.; Vecchi, G.; Gómez Rivas, J.","","2011","We demonstrate the coupling of bright and dark surface lattice resonances (SLRs), which are collective Fano resonances in 2D plasmonic crystals. As a result of this coupling, a frequency stop gap in the dispersion relation of SLRs is observed. The different field symmetries of the low- and high-frequency SLR bands lead to pronounced differences in their coupling to free-space radiation. Standing waves of very narrow spectral width compared to localized surface-plasmon resonances are formed at the high-frequency band edge, while subradiant damping onsets at the low-frequency band edge, leading the resonance into darkness. We introduce a coupled-oscillator analog to the plasmonic crystal, which serves to elucidate the physics of the coupled plasmonic resonances and which is used to estimate very high quality factors for SLRs.","","en","journal article","American Physical Society","","","","","","","","Applied Sciences","IST/Imaging Science and Technology","","","",""
"uuid:9732f32e-7376-4f52-abe4-b191da116125","http://resolver.tudelft.nl/uuid:9732f32e-7376-4f52-abe4-b191da116125","Can enterprise architectures reduce failure in development projects?","Janssen, M.F.W.H.A.; Klievink, B.","","2012","Purpose: Scant attention has been given to the role of enterprise architecture (EA) in relationship to risk management in information system development projects. Even less attention has been given to the inter-organizational setting. The aim of this paper is to better understand this relationship. Design/methodology/approach: The relationship between EA and project failure/success is investigated by – through a workshop – creating a retrospective view on the use of architectures in large and complex ICT-projects. Findings: Failure factors can be grouped in organization network, people, process, product and technology categories. The findings show that a disappointingly limited number of public sector development projects make sufficient use of architecture as a risk management instrument. Architectures should be considered both as a risk-mitigating instrument and as an organizational shaping routine to reduce project failure and manage risk in organization networks. Research limitations/implications: A single workshop with a limited number of participants was conducted. The findings need further refinement and generalization based on more empirical research investigating the relationship between architecture and project failure. Practical implications: Architecture should give explicit consideration to risk management and help to draw attention to this. Governance mechanisms need be defined to ensure that the organizations’ members become aware of both architecture and risk management. Risk management and EA have similarities, as they are both an instrument and an organizational shaping routine. Originality/value: Governments collaborate more and more in organizational networks and for that reason often multiple organizations are involved in information system project developments. Enterprise architecture as a risk mitigation instrument has not, to date, been given attention. Paper type: Research paper","information systems; risk management; organizational processes; project failure; critical failure factors; enterprise architecture; information architecture","en","journal article","Emerald Group Publishing Limited","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:1dff46e3-c17b-4c2c-9a46-3c0f15b985c1","http://resolver.tudelft.nl/uuid:1dff46e3-c17b-4c2c-9a46-3c0f15b985c1","Issues and guiding principles for opening governmental judicial research data","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Meijer, RF (External organisation); Choenni, R (External organisation); Charalabidis, Y (External organisation); Jeffery, KG (External organisation)","Scholl, H.J. (editor); Janssen, M.F.W.H.A. (editor); Wimmer, M.A. (editor); Moe, C.E. (editor); Flak, L.S. (editor)","2012","","Conf.proc. > 3 pag","en","conference paper","IFIP International Federation for Information Processing 2013","","","","","","","","","","Information and Communication Technology","","",""
"uuid:79abebde-02df-494b-8a00-639cf76250d4","http://resolver.tudelft.nl/uuid:79abebde-02df-494b-8a00-639cf76250d4","Towards true interoperable geographic data: developing a global standard for geo-data licences","van Loenen, B. (TU Delft OLD Geo-information and Land Development); Janssen, K.; Welle Donker, F.M. (TU Delft OLD Geo-information and Land Development)","Janssen, K (editor); Crompvoets, J (editor)","2012","","","en","book chapter","Leuven University Press","","","","","","","","","","OLD Geo-information and Land Development","","",""
"uuid:59a33111-ce6c-4242-9595-61ea40006028","http://resolver.tudelft.nl/uuid:59a33111-ce6c-4242-9595-61ea40006028","Socio-technical Impediments of Open Data","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Choenni, S (External organisation); Meijer, RF (External organisation); Sheikh Alibaks, R (External organisation)","","2012","","academic journal papers; Peer-lijst tijdschrift","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:8099554d-3356-492a-98e7-376612a513af","http://resolver.tudelft.nl/uuid:8099554d-3356-492a-98e7-376612a513af","Designing, formalizing and evaluating a flexible architecture for integrated service delivery: Combining event-driven and service-oriented architectures","Overbeek, S.J.; Janssen, M.F.W.H.A.; Van Bommel, P.","","2012","An in?ux of service providers collaborate in networks to meet their clients’ demands. Integrated service delivery (ISD) is a way to let networked service providers offer services to their clients by bundling selected services offered by each provider so that clients do not have to deal with each single provider anymore. Designing such a network is a complicated endeavor as independent organizations need to collaborate and should understand how their activities are dependent on each other. Communication of events is necessary to deal with unpredictable and complex processes in such a network. In contrast with conventional event-driven architecture and service-oriented architecture (SOA) approaches, the hybrid model of event-driven interactions and SOA offers the required ?exibility to realize ISD. This ?exibility is realized by integrating not only services but also the processes of the different service providers to supply such services. A design science approach has been applied resulting in a detailed and formalized design of an eventdriven service-oriented architecture (EDSOA). The EDSOA has been illustrated to show how ISD is realized with support of the architecture in a scenario concerning an application for a temporary residence permit by an immigrant. An evaluative workshop has been conducted which re?ected that the following criteria are most important for successful organizational adoption of the EDSOA: expected usefulness, ?t with organizational standards, use of trusted technology, and ease of maintenance.","design science; EDSOA; integrated service delivery; public/private service network; web service","en","journal article","Springer","","","","","","","","Technology, Policy and Management","ISS","","","",""
"uuid:5a895005-6f26-452a-9eb8-19c46d7831bb","http://resolver.tudelft.nl/uuid:5a895005-6f26-452a-9eb8-19c46d7831bb","Power handling and responsivity of submicron wide superconducting coplanar waveguide resonators","Janssen, R.M.J.; Endo, A.; Baselmans, J.J.A.; De Visser, P.J.; Barends, R.; Klapwijk, T.M.","","2012","The sensitivity of microwave kinetic inductance detectors (MKIDs) based on coplanar waveguides (CPWs) needs to be improved by at least an order of magnitude to satisfy the requirements for space-based terahertz astronomy. Our aim is to investigate if this can be achieved by reducing the width of the CPW to much below what has typically been made using optical lithography (> 1 ?m). CPW resonators with a central line width as narrow as 300 nm were made in NbTiN using electron beam lithography and reactive ion etching. In a systematic study of quarter-wave CPW resonators with varying widths it is shown that the behavior of responsivity, noise and power handling as a function of width continues down to 300 nm. This encourages the development of narrow KIDs using Al in order to improve their sensitivity.","kinetic inductance detector · coplanar waveguide","en","journal article","Springer","","","","","","","","Applied Sciences","Kavli Institute of NanoScience","","","",""
"uuid:74c0b76e-781c-4f0c-ab42-f31c50d546e9","http://resolver.tudelft.nl/uuid:74c0b76e-781c-4f0c-ab42-f31c50d546e9","Design of an integrated filterbank for DESHIMA: On-chip submillimeter imaging spectrograph based on superconducting resonators","Endo, A.; Van der Werf, P.; Janssen, R.M.J.; De Visser, P.J.; Klapwijk, T.M.; Baselmans, J.J.A.; Ferrari, L.; Baryshev, A.M.; Yates, S.J.C.","","2012","An integrated filterbank (IFB) in combination with microwave kinetic inductance detectors (MKIDs), both based on superconducting resonators, could be used to make broadband submillimeter imaging spectrographs that are compact and flexible. In order to investigate the possibility of adopting an IFB configuration for DESHIMA (Delft SRON High-redshift Mapper), we study the basic properties of an IFB circuit using electromagnetic simulation. In an idealized situation, one could integrate onto a 4-inch wafer a 9 pixel × 920 color 3 dimensional imaging device, which instantaneously covers multiple submillimeter telluric windows with a resolving power of f/df = 1000. We also simulate a slightly more realistic situation, in which the dimensions of the filters differ from their designed values, to see how fabrication errors introduce scattering in the transmission of the channels","kinetic inductance detector · submillimeter wave · spectrometer","en","journal article","Springer","","","","","","","","Applied Sciences","Kavli Institute of NanoScience","","","",""
"uuid:ca7682be-9bca-47d9-8d29-0db047051cb5","http://resolver.tudelft.nl/uuid:ca7682be-9bca-47d9-8d29-0db047051cb5","Quest for a global standard for geo-data licenses","Van Loenen, B.; Janssen, K.; Welle Donker, F.M.","","2012","The ability to share geo?data is key to the success of spatial data infrastructures. A major barrier in sharing geo?data is the use of non?standard Licenses which are difficult to understand both for human beings and computers. This article compares existing (national and international) licensing frameworks as to the key components they share. It draws out common elements that can serve as a basis for a global set of model Licenses.","licensing; geo?data; standard; development","en","conference paper","GSDI Association Press","","","","","","","","OTB Research Institute for the Built Environment","","","","",""
"uuid:10386e20-8901-4980-adfe-0c0dcdfdfb8f","http://resolver.tudelft.nl/uuid:10386e20-8901-4980-adfe-0c0dcdfdfb8f","The triggering probability of radio-loud AGN: A comparison of high and low excitation radio galaxies in hosts of different colors","Janssen, R.M.J.; Röttgering, H.J.A.; Best, P.N.; Brinchmann, J.","","2012","","galaxies: active; galaxies: statistics; radio continuum: galaxies","en","conference paper","EDP Sciences","","","","","","","","Applied Sciences","Kavli Institute of Nanoscience Delft","","","",""
"uuid:751fc0e8-3634-46ea-8a5e-9c35f0b14822","http://resolver.tudelft.nl/uuid:751fc0e8-3634-46ea-8a5e-9c35f0b14822","Design Choices Underlying the Software as a Service (SaaS) Business Model from the User Perspective: Exploring the Fourth Wave of Outsourcing","Joha, A.; Janssen, M.F.W.H.A.","","2012","Software as a Service (SaaS) can be viewed as the fourth wave of outsourcing. SaaS is a relatively new type of service delivery model in which a service provider delivers its services over the web to many users on a pay per use or period basis. In the scarce literature available, the SaaS business model is almost always analyzed from the perspective of the service provider perspective, and rarely from the user organization. Using the unified business model conceptual framework, two case studies are investigated to understand the design choices underlying the SaaS business model from the user organization perspective. The analyses on the business model dimensions provided insight into the differences between the case studies and helped to identify eight discriminating design choices that are important when designing SaaS business models. These include the (1) SaaS service characteristics, (2) SaaS value source, (3) SaaS user target group, (4) data architecture configuration and tenancy model, (5) SaaS governance and demand/supply management core competencies, (6) cloud deployment model, (7) SaaS integration and provider strategy and the (8) SaaS pricing structure. An appeal is made for more research into the impact of cloud business models.","SaaS; business model; cloud computing; design choices; software as a Service; sourcing","en","journal article","Graz University of Technology, Institut für Informationssysteme und Computer Medien","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:0d8eb6d1-9919-448b-b222-d8dec5528ff1","http://resolver.tudelft.nl/uuid:0d8eb6d1-9919-448b-b222-d8dec5528ff1","Revisiting the melting temperature of NpO2 and the challenges associated with high temperature actinide compound measurements","Böhler, R.; Welland, M.J.; De Bruycker, F.; Boboridis, K.; Janssen, A.; Eloirdi, R.; Konings, R.J.M.; Manara, D.","","2012","This work revisits the melting behaviour of neptunium dioxide, an actinide compound which can be produced in the nuclear fuel during operation, and which has an important impact on the nuclear fuel and waste radioactivity especially on the very long term. The present experimental approach employs remote laser heating under controlled atmosphere and fast pyrometry. This technique circumvents problems encountered by more traditional heating techniques, in particular, the reaction between sample and containment at temperatures beyond 2500 K. In addition, only a small amount of sample material is required, which is an advantage with respect to the radioactivity and limited availability of neptunium. The NpO2 melting/freezing temperature has been measured to be 3070 K?±?62 K, much higher than previous values (around 2830 K) obtained by more traditional thermal analysis methods. The large amount of experimental data collected allowed a consistent statistical analysis. It seems likely, although not fully evident from the present results, that the high oxygen potential at temperatures around melting leads to a slightly hypo-stoichiometric congruent melting composition, as already observed in other actinide (ThO2, PuO2) and lanthanide oxides (e.g., CeO2). Finally, a recently developed phase-field model was used for the simulation of the observed thermograms, allowing a deeper insight in material properties that are difficult to directly measure. For example, a polaron contribution to the high-temperature thermal conductivity, well accepted for the commonly studied actinide oxide UO2, is shown here to likely be present in NpO2.","freezing; heat treatment; melting; neptunium compounds; polarons; thermal analysis; thermal conductivity","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","RRR/Radiation, Radionuclides and Reactors","","","",""
"uuid:1e5fb0e1-819c-4902-b701-554e3b8cce2c","http://resolver.tudelft.nl/uuid:1e5fb0e1-819c-4902-b701-554e3b8cce2c","Enhancing business and government interactions in global trade","Van Stijn, E.J.; Klievink, A.J.; Janssen, M.F.W.H.A.; Tan, Y.","","2012","Government agencies and businesses cooperate and invest heavily to achieve reliable and secure global supply networks. A so-called data pipeline, which integrates data from various parties in the supply chain and incorporates data from new tracking and monitoring technologies, would enable real-time data management for businesses. This IT infrastructure has a global scale, since it has to function both within and across countries and continents. Governments can use this data pipeline to improve the coordination of border management and reduce the administrative burden for businesses. Furthermore, businesses and government can collaborate to capitalize on modern IT and use the innovation for improving risk and data management. This paper explains a conceptual model of the data pipeline and its governance implications. As this global infrastructure cannot be built by government alone but needs to be largely realized by businesses, a public-private governance model is needed. Governments, and even supra-national institutions, would need to create the right technical, organizational, and legal environment (e.g. standards, harmonization of procedures, mutual recognition), and have to provide alternative incentives to stimulate the development of those parts of the pipeline that are without commercially viable business models.","global IT infrastructure; data pipeline; international trade; public-private governance","en","conference paper","","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:a25870e9-b9d5-423a-a2f4-fc436f2101fb","http://resolver.tudelft.nl/uuid:a25870e9-b9d5-423a-a2f4-fc436f2101fb","Deliberate deformation of concrete after casting","Grünewald, S.; Janssen, B.; Schipper, H.R.; Vollers, K.J.; Walraven, J.C.","","2012","This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place in the first hour after casting. In this research thin double-curved precast shell or cladding elements are considered. The paper introduces the method used to support the flexible formwork and focuses on the concrete technology necessary to control the process of deformation after casting. Relevant parameters are discussed that influence the concrete’s behaviour shortly after casting. Rheological characteristics of the fresh concrete appear to be particularly important for the design of a suitable mixture. Since from traditional concrete research little experimental data on deformation after casting appeared to be available, experiments were carried out to test a number of prepositions. Results of these experiments are shown as well.","concrete; flexible mould; rheology; precast; freeform","en","conference paper","University of Bath","","","","","","","","Civil Engineering and Geosciences","Structural Engineering","","","",""
"uuid:c46bd896-432d-4430-b1eb-8770dfe4724f","http://resolver.tudelft.nl/uuid:c46bd896-432d-4430-b1eb-8770dfe4724f","Deliberate deformation of concrete after casting","Grunewald, S.; Janssen, B.; Schipper, H.R.; Vollers, K.J.; Walraven, J.C.","","2012","This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place in the first hour after casting. In this research thin double-curved precast shell or cladding elements are considered. The paper introduces the method used to support the flexible formwork and focuses on the concrete technology necessary to control the process of deformation after casting. Relevant parameters are discussed that influence the concrete’s behaviour shortly after casting. Rheological characteristics of the fresh concrete appear to be particularly important for the design of a suitable mixture. Since from traditional concrete research little experimental data on deformation after casting appeared to be available, experiments were carried out to test a number of prepositions. Results of these experiments are shown as well.","","en","conference paper","University of Bath","","","","","","","","Civil Engineering and Geosciences","Structural Engineering","","","",""
"uuid:ee5031f2-b2a6-4b88-a2c6-9980330cc9e7","http://resolver.tudelft.nl/uuid:ee5031f2-b2a6-4b88-a2c6-9980330cc9e7","De toepasbaarheid van de SUR-meting voor ultrafiltratie van rwzi-effluent","Janssen, A.N.; van der Graaf, J.","","2012","","flux; membraanfiltratie; rwzi-effluent; SUR-meting; TMP; (membraan)vervuiling; weerstand","nl","journal article","HolaPress Wetenschap","","","","","","","","Civil Engineering and Geosciences","Water Management","","","",""
"uuid:fd615056-1246-4736-bbc7-96d783563536","http://resolver.tudelft.nl/uuid:fd615056-1246-4736-bbc7-96d783563536","Topography-induced focusing of random waves","Smit, P.B.; Janssen, T.T.; Herbers, T.H.C.","","2012","Refraction of narrow-band surface waves in coastal areas can result in wave-focal zones where due to interference, wave statistics vary rapidly and on similar length scales as those of individual waves. However such interference patterns, or wave coherence, are not accounted for in conventional stochastic wave models that are based on the energy balance equation or radiative transfer equation. In this work we present a quasi-coherent theory, which is an extension of the radiative transfer equation and quasi-homogeneous theory. We show that this new stochastic modelling approach can resolve rapid variations in wave statistics that occur in the vicinity of a wave caustic. The results compare favourably to those obtained from ensemble averages calculated with a deterministic phase resolving model (SWASH) and, in a focal zone, constitute a significant improvement over those obtained with a conventional stochastic wave model based on an energy balance equation (SWAN).","wave focusing; random waves; stochastic wave model; diffraction; wave interference","en","conference paper","Coastal Engineering Research Council","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:569dbba4-ab70-4128-b7d9-ea89a80c9228","http://resolver.tudelft.nl/uuid:569dbba4-ab70-4128-b7d9-ea89a80c9228","Data transformations in custom digital workflows: Property graphs as a data model for user-defined mappings","Janssen, P.; Stouffs, R.M.F.; Chaszar, A.T.; Boeykens, S.; Toth, B.","","2012","This paper describes the use of property graphs for mapping data between AEC software tools, which are not linked by common data formats and/or other interoperability measures. The intention of introducing this in practice, education and research is to facilitate the use of diverse, non-integrated design and analysis applications by a variety of users who need to create customised digital workflows, including those who are not expert programmers. Data model types are examined by way of supporting the choice of directed, attributed, multi-relational graphs for such data transformation tasks. A brief exemplar design scenario is also presented to illustrate the concepts and methods proposed, and conclusions are drawn regarding the feasibility of this approach and directions for further research.","","en","conference paper","EG-ICE","","","","","","","","Architecture and The Built Environment","Architectural Engineering +Technology","","","",""
"uuid:d274ac33-b9b4-4db8-90b5-1dd346505206","http://resolver.tudelft.nl/uuid:d274ac33-b9b4-4db8-90b5-1dd346505206","Topography-induced focusing of random waves","Smit, P.B.; Janssen, T.T.; Herbers, T.H.C.","","2012","Refraction of narrow-band surface waves in coastal areas can result in wave-focal zones where due to interference, wave statistics vary rapidly and on similar length scales as those of individual waves. However such interference patterns, or wave coherence, are not accounted for in conventional stochastic wave models that are based on the energy balance equation or radiative transfer equation. In this work we present a quasi-coherent theory, which is an extension of the radiative transfer equation and quasi-homogeneous theory. We show that this new stochastic modelling approach can resolve rapid variations in wave statistics that occur in the vicinity of a wave caustic. The results compare favourably to those obtained from ensemble averages calculated with a deterministic phase resolving model (SWASH) and, in a focal zone, constitute a significant improvement over those obtained with a conventional stochastic wave model based on an energy balance equation (SWAN).","Wave focusing; Random waves; Stochastic wave model; Diffraction; Wave interference","en","conference paper","Coastal Engineering Research Council","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:478d5512-6ade-4553-bef7-63fda09f352c","http://resolver.tudelft.nl/uuid:478d5512-6ade-4553-bef7-63fda09f352c","Effects of Holding Time on Thermomechanical Fatigue Properties of Compacted Graphite Iron Through Tests with Notched Specimens","Ghodrat, S.; Riemslag, T.A.C.; Kestens, L.A.I.; Petrov, R.H.; Janssen, M.; Sietsma, J.","","2012","In cylinder heads of compacted graphite iron (CGI), the heating and cooling cycles can lead to localized cracking due to thermomechanical fatigue (TMF). Traditionally, TMF behavior is studied by thermal cycling of smooth specimens. The resulting number of cycles to failure (Nf) constitutes a single parameter that can be used to predict actual service failures. Nevertheless, there are also some drawbacks of the conventional testing procedures, most noticeably the prolonged testing times and a considerable scatter in test results. To address these drawbacks, TMF tests were performed using notched specimens, resulting in shorter testing times with less scatter. In the case of cast iron, artificial notches do not necessarily change the TMF behavior since the inherent graphite particles behave as internal notches. Using a notch depth of 0.2 mm, the effect of prolonged holding times (HT) on TMF lifetime was studied and a clear effect was found. Extended holding times were also found to be accompanied by relaxation of compressive stresses, causing higher tensile stresses to develop in the subsequent low temperature stages of the TMF cycles. The lifetimes in notched CGI specimens can be predicted by the Paris’ fatigue crack growth model. This model was used to differentiate between the individual effects of stress level and holding times on TMF lifetime. Microstructural changes were evaluated by analyzing quantitative data sets obtained by orientation contrast microscopy based on electron backscattered diffraction (EBSD).","","en","journal article","Springer-Verlag","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Innovation Institute","","","",""
"uuid:a599e8a4-0daa-427e-b435-b84bd775549a","http://resolver.tudelft.nl/uuid:a599e8a4-0daa-427e-b435-b84bd775549a","Are Shoulders with A Reverse Shoulder Prosthesis Strong enough? A Pilot Study","Alta, T.D.W.; Veeger, H.E.J.; Janssen, T.W.J.; Willems, W.J.","","2012","Background It has been suggested that limited active ROM of reverse shoulder prostheses relates to lack of strength. However, the postoperative strength has not been quantified. Questions/purposes We therefore measured joint torques in patients with reverse shoulder prostheses and correlated torques with functional scores. Methods We recruited 33 patients (age, 72 ± 8 years) with a reverse prosthesis (37 shoulders, 21 primary and 16 revisions). We obtained Constant-Murley, DASH, and Simple Shoulder Test ([D]SST) scores, and performed two isokinetic protocols (abduction/adduction and external/internal rotation) at 60° per second. Minimum followup was 4 months (average, 23 months; range, 4–63 months). Results Twenty-three patients (24 shoulders; 13 primaries, 11 revisions) were able to perform at least one of the defined tasks. Mean abduction and adduction torques were 15 Nm ± 7 Nm and 16 Nm ± 10 Nm (19%–78% of normal shoulders). External and internal rotation tasks could be performed by only 13 patients (14 shoulders; nine primary, five revisions) generating 9 Nm ± 4 Nm and 8 Nm ± 3 Nm, respectively (13%–71% of normal shoulders). We found moderate correlations between Constant-Murley, DASH and (D)SST (D = Dutch translation) scores and abduction and external rotation. Conclusions Patients with a reverse prosthesis had reduced strength when compared with normal values reported in the literature (only 65% of patients could perform the protocol). This effect was greatest for external rotation and might explain clinical outcomes with which a moderately strong relationship was observed. Our observations suggest limited strength is a major factor in reduced ROM.","","en","journal article","Springer-Verlag","","","","","","","","Mechanical, Maritime and Materials Engineering","Biomechanical Engineering","","","",""
"uuid:b5d5a1b7-bc1c-462e-8810-98830aa5a410","http://resolver.tudelft.nl/uuid:b5d5a1b7-bc1c-462e-8810-98830aa5a410","Advancing Open 3D Modelling Standards in National Spatial Information Policy","Trakas, A.; Janssen, P.; Stoter, J.","","2012","Individuals and organisations around the world - facing extraordinary challenges and new opportunities - are together engaged in numerous projects, involving natural and built environments. Spatial information policy is at the heart of these projects. The information technologies available enable individuals to observe, measure, describe, map and portray these environments with increasing ease, flexibility and precision. In our time, individuals create digital geographic objects that reflect the ones of the real world, so that we can better understand it, sharing our understandings and managing our diverse activities. National Spatial Data Infrastructures (NSDIs) provide public information about survey points, elevation, roads, political boundaries and water bodies. Basic aerial images are widely useful, as are data about land use and land cover. The purpose of this paper is to help policy makers understand the role of policy in advancing standards that support the goals of INSPIRE, the overarching European SDI effort, and SDIs in general. To illustrate the role of policy in SDI formation, the National Spatial Data Infrastructure (NSDI) executive committee in the Netherlands called Geonovum, will be examined. It has been working on behalf of the Dutch Kadaster, the Netherlands Geodetic Commission and the Dutch Ministry of Infrastructure and Environment towards the establishment of a national 3D standard that aligns both the existing national 2D standards and the International OGC standard for 3D geo-information, CityGML (OGC, 2012). The Netherlands’ CityGML-based national 3D standard is an important step towards the inclusion of comprehensive 3D information about the built and natural environment within the Dutch SDI.","Geonovum; 3D; CityGML; OGC; urban modelling","en","journal article","ePractice.eu","","","","","","","","Applied Sciences","OTB Research","","","",""
"uuid:6f073788-8847-4784-9bd0-961df118542f","http://resolver.tudelft.nl/uuid:6f073788-8847-4784-9bd0-961df118542f","Towards Legal Knowledge Management Systems for Regulatory Compliance","Boella, G.; Hulstijn, J.; Humphreys, L.; Janssen, M.F.W.H.A.; Van der Torre, L.","","2012","Maintaining regulatory compliance is an increasing concern. Legal Knowledge Management systems could support the work of compliance managers. However, there are challenges to overcome, of interpreting legal knowledge and mapping it onto business processes. In this discussion paper we determine requirements for Legal Knowledge Management systems that can handle these challenges. We argue that an approach to Legal Knowledge Management should consist of four pillars: (1) a legal ontology to express the legal concepts that are central to the interpretation of rules and regulations in practice, (2) natural language processing techniques, to semi-automatically populate the ontology, (3) a systematic method for mapping the legal concepts onto the actual data and business processes of a company, and (4) a method to construct an audit trail as part of the process design, providing legally acceptable evidence of compliance. The challenges are illustrated by an example of MIFID, a set of European regulations in the financial domain.","regulatory compliance; legal ontology; evidence","en","conference paper","itAIS","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:d3857fab-1361-47a3-8d5d-d4043bd970a1","http://resolver.tudelft.nl/uuid:d3857fab-1361-47a3-8d5d-d4043bd970a1","On stabilization of loosened hip stems via cement injection into osteolytic cavities","Andreykiv, A.; Janssen, D.; Nelissen, R.G.H.H.; Vlastar, E.R.","","2012","Background Cement injection into osteolytic areas around the cement mantle is a technique for refixation of loose hip implants for patients who cannot undergo standard revision surgery. Preliminary clinical results show the improvement in walking distance, patients' independence and pain relief. Methods In this study, we use a detailed finite element model to analyze whether cement injection into osteolytic areas contributes to the overall implant stability. We study the effect of various factors, like location and size of osteolytic areas, interface conditions and bone stiffness on bone–cement relative motion. Findings Presented results demonstrate that the procedure is most effective for the osteolytic areas located in the proximal region of the femur, while factors like a thin layer of residual fibrous tissue around the injected cement, that was not removed during the surgery, combined with reduced bone stiffness reduce the efficiency of the procedure. Interpretation Cement injection is able to stabilize loosened hip prostheses. However, it is important to remove the fibrous tissue layer completely, as even a thin layer will negatively influence stabilization. We will focus our research efforts on developing fibrous tissue removal techniques in order to optimize this minimally invasive treatment.","hip; refixation; cement injection; finite element; bonecement micromotions","en","journal article","Elsevier","","","","","","","","Mechanical, Maritime and Materials Engineering","Bioechanical Engineering","","","",""
"uuid:526a36fa-29b5-470a-8e81-61489871ccf2","http://resolver.tudelft.nl/uuid:526a36fa-29b5-470a-8e81-61489871ccf2","An activity theory analysis of boundary objects in cross-border information systems development for disaster management","Bharosa, N.; Lee, J.; Janssen, M.; Rao, H.R.","","2012","One of the main challenges in cross-border disaster management is the development and use of information systems that cater the needs of heterogeneous relief agencies, policies, activities and cultures. Drawing upon activity theory, this paper examines cross-border information systems development for disaster management. We infuse the concept of boundary objects into activity theory by the characterization of the artifacts. This allows articulating how the socio-technical objects are meshed with the process of cross-border collaboration for systems development. Our longitudinal ethnographic field study on a cross-border flood management project, VIKING, revealed how the project was empowered and developed by four key boundary objects, i.e. the governance structure of the program, two information systems (a disaster management information system and an online collaboration portal), and recurring cross-border exercises as an evaluation and feedback mechanism. The selective institutionalizations of these key boundary objects helped the participants overcome various contradictions existed in the systems development. The study results also show that both goal-oriented actions and boundary objects can affect the outcomes of long-term large-scale disaster management systems development","Disaster management, Information systems development, Cross-border collaboration, Activity theory,; Boundary objects","en","journal article","Springer-Verlag","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:952c8b0e-c55e-4443-9b41-14c38806a840","http://resolver.tudelft.nl/uuid:952c8b0e-c55e-4443-9b41-14c38806a840","Benefits, Adoption Barriers and Myths of Open Data and Open Government","Janssen, M.F.W.H.A.; Charalabidis, Y.; Zuiderwijk, A.M.G.","","2012","Although a significant number of public organizations have embraced the idea of open data, many are still reluctant to do this. One root cause is that the publicizing of data represents a shift from a closed to an open system of governance, which has a significant impact upon the relationships between public agencies and the users of open data. Yet no systematic research is available which compares the benefits of an open data with the barriers to its adoption. Based on interviews and a workshop, the benefits and adoption barriers for open data have been derived. The findings show that a gap exists between the promised benefits and barriers. They furthermore suggest that a conceptually simplistic view is often adopted with regard to open data, one which automatically correlates the publicizing of data with use and benefits. Five ‘myths’ are formulated promoting the use of open data and placing the expectations within a realistic perspective. Further, the recommendation is given to take a user’s view and to actively govern the relationship between government and its users.","systems theory; institutional theory; adoption; diffusion; open data; open government; governance; transformation","en","journal article","Taylor & Francis","","","","","","","","Technology, Policy and Management","ICT","","","",""
"uuid:5df953ad-a12f-4d83-a23d-4013a09978ca","http://resolver.tudelft.nl/uuid:5df953ad-a12f-4d83-a23d-4013a09978ca","A Stakeholder Analysis of Business-to-Government Information Sharing: The Governance of a Public-Private Platform","Klievink, A.J.; Janssen, M.F.W.H.A.; Tan, Y.H.","","2012","ICT enables business-to-government (b-to-g) information exchange, which can be used to enhance control and compliance by businesses. However, sharing information can cause resistance by businesses, as for them information is key to competitive advantage, whereas governments need this information to conduct their tasks at lower costs. In this paper, the adoption of a b-to-g information-sharing platform is analyzed from a stakeholder theory perspective. The analysis shows that for stakeholders not the information-sharing infrastructure itself is their primary concern, but it is the governance thereof. A successful adoption and stakeholder management strategy was that companies have the sense-of-urgency and clear requirements to develop a public-private governance model. Governments can set the conditions to ensure that public functionality is also developed. We argue that stakeholder analysis should be used in developing adoption and implementation strategies.","public-private platform; stakeholder theory; information exchange; business-to-government; information infrastructure; transformation","en","journal article","IGI Global","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:d7884462-abde-48f9-82ea-6cac583aa08e","http://resolver.tudelft.nl/uuid:d7884462-abde-48f9-82ea-6cac583aa08e","The potential of metadata for linked open data and its value for users and publishers","Zuiderwijk, A.M.G.; Jeffery, K.G.; Janssen, M.F.W.H.A.","","2012","Public and private organizations increasingly release their data to gain benefits such as transparency and economic growth. The use of these open data can be supported and stimulated by providing considerable metadata (data about the data), including discovery, contextual and detailed metadata. In this paper we argue that metadata are key enablers for the effective use of Linked Open Data (LOD). We illustrate the potential of metadata by 1) presenting an overview of advantages and disadvantages of metadata derived from literature, 2) presenting metadata requirements for LOD architectures derived from literature, workshops and a questionnaire, 3) describing a LOD metadata architecture that meets the requirements and 4) showing examples of the application of this architecture in the ENGAGE project. The paper shows that using metadata with the appropriate metadata architecture can yield considerable benefits for LOD publication and use, including improving find ability, accessibility, storing, preservation, analysing, comparing, reproducing, finding inconsistencies, correct interpretation, visualizing, linking data, assessing and ranking the quality of data and avoiding unnecessary duplication of data. The Common European Research Information Format (CERIF) can be used to build the metadata architecture and achieve the advantages.","metadata; linked open data; LOD; open data; metadata; architecture; requirements; elements; CERIF","en","journal article","JeDEM","","","","","","","","Technology, Policy and Management","ISS","","","",""
"uuid:02362186-680b-4ca0-8d3a-72b91bab3a97","http://resolver.tudelft.nl/uuid:02362186-680b-4ca0-8d3a-72b91bab3a97","Transformation to cloud services sourcing: Required it governance capabilities","Joha, A.; Janssen, M.F.W.H.A.","","2012","The sourcing of cloud services is a relatively new type of service delivery model in which an organization gets access to IT services via a cloud service provider that is delivering services over the web to many users on a pay per use or period basis. Even though the importance of IT governance is often underlined, there is limited literature available regarding the required IT governance capabilities that public sector organizations need to have in place to successfully implement and manage a cloud service delivery model. Using an existing governance framework of IT core capabilities as basis, the required cloud computing capabilities are investigated using interviews and studying reports. The analyses helped to identify 16 discriminating capabilities that are essential when effectively implementing and managing cloud services in the public sector. Different factors, including the cloud service and deployment model, the strategic intent underlying cloud sourcing, the degree and complexity of cloud sourcing and the IT governance structure, were found to influence the relevance of cloud capabilities and the relevance might also change over time.","cloud computing, public sector, IT core capabilities, IT governance, outsourcing, public sector, sourcing","en","journal article","ICST","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:08096d85-ed12-49f8-b95d-076f6802323d","http://resolver.tudelft.nl/uuid:08096d85-ed12-49f8-b95d-076f6802323d","Business models: Tooling and a research agenda","Bouwman, W.A.G.A.; De Reuver, G.A.; Solaimani Kartalaei, H.; Daas, D.; Haaker, T.; Janssen, W.; Iske, P.; Walenkamp, B.","","2012","","","en","conference paper","Bled eCommerce Conference","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:764fbebc-009d-4632-a058-c2160ef3d1ee","http://resolver.tudelft.nl/uuid:764fbebc-009d-4632-a058-c2160ef3d1ee","Lean government: Critical success factors for XBRL-based business-to-government reporting","Bharosa, N.; De Winne, C.P.I.; Van Wijk, R.; Janssen, M.F.W.H.A.","","2012","Lean government is all about doing better with less through the use of ICT and the realisation of process improvements. The recently introduced eXtensible Business Reporting Language (XBRL) has shown some initial success in realising lean government. Once data is stored in XBRL format, businesses can transmit it electronically to government for reporting purposes. For businesses, XBRL will increase both corporate accountability and transparency by reducing the time needed to collect, structure and share corporate data within the company, as well as with supply chain partners, investors and government agencies. Government agencies will benefit from higher information quality (no data rekeying in the reporting chain) and new forms of compliance monitoring requiring fewer resources. Yet, because of the complexity of standardising processes, data and infrastructure in a publicprivate information exchange, the full potential of this ‘sleeping giant’ is often left dormant in practice. Drawing on the best practice of Standard Business Reporting (SBR) in the Netherlands, this paper shares some critical success factors derived from the move towards a lean government in the country. Eight critical success factors (CSFs) focusing on the transformation process are identified. While the scope and elaboration of the factors is limited to business-to-government (B2G) reporting, the possibilities for lean government are broader, opening new avenues for governments and researchers.","Lean government, XBRL, SBR, transformational government, standard business reporting, critical success factors, compliance management","en","journal article","epractice.eu","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:fc44049d-1f4c-4c00-9dcc-987bef9fcf2d","http://resolver.tudelft.nl/uuid:fc44049d-1f4c-4c00-9dcc-987bef9fcf2d","Challenges in developing public-private business models","Klievink, A.J.; Janssen, M.F.W.H.A.","","2012","","public-?private networks, eGovernment, open government, governance, business models","en","journal article","epractice.eu","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:5f010109-d312-4af2-a388-3361a41b85a0","http://resolver.tudelft.nl/uuid:5f010109-d312-4af2-a388-3361a41b85a0","Open data policies, their implementation and impact: a framework for comparison","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2013","In developing open data policies, governments aim to stimulate and guide the publication of government data and to gain advantages from its use. Currently there is a multiplicity of open data policies at various levels of government, whereas very little systematic and structured research has been done on the issues that are covered by open data policies, their intent and actual impact. Furthermore, no suitable framework for comparing open data policies is available, as open data is a recent phenomenon and is thus in an early stage of development. In order to help bring about a better understanding of the common and differentiating elements in the policies and to identify the factors affecting the variation in policies, this paper develops a framework for comparing open data policies. The framework includes the factors of environment and context, policy content, performance indicators and public values. Using this framework, seven Dutch governmental policies at different government levels are compared. The comparison shows both similarities and differences among open data policies, providing opportunities to learn from each other’s policies. The findings suggest that current policies are rather inward looking, open data policies can be improved by collaborating with other organizations, focusing on the impact of the policy, stimulating the use of open data and looking at the need to create a culture in which publicizing data is incorporated in daily working processes. The findings could contribute to the development of new open data policies and the improvement of existing open data policies.","open data policies; open data framework; open data; open government; comparitive research; policies; principles; guidelines","en","journal article","","","","","","harvest, Available online 26 December 2013","","2016-01-08","","","Information and Communication Technology","","",""
"uuid:eece724b-409e-4a86-94f4-430720ce8bb4","http://resolver.tudelft.nl/uuid:eece724b-409e-4a86-94f4-430720ce8bb4","MOOCS: Trends and opportunities for higher education","Schuwer, Robert; Janssen, Ben; van Valkenburg, W.F. (TU Delft OLD Production & Delivery)","","2013","This article looks at massive open online courses (MOOCs) and the opportunities that they offer for higher education in the Netherlands. We look at what a MOOC actually is, the context of “open education”, and the discussion of the possibly disruptive impact of MOOCs on higher education.","MOOCs","en","book chapter","Stichting SURF","","","","","","","","","","OLD Production & Delivery","","",""
"uuid:cacb4c42-dce3-46b6-99b8-392ff351a26e","http://resolver.tudelft.nl/uuid:cacb4c42-dce3-46b6-99b8-392ff351a26e","D1.1 Inventarisatie Use Cases: Combineren van Energie en Ruimte Informatie Standaarden als Enabler voor Smart Grids","Verhoosel, J.; Roes, J.; Bruinenberg, J.; Van Doorn, L.; Janssen, P.; De Vries, M.; Van Oosterom, P.","","2013","","","nl","report","Cerise SG","","","","","","","","OTB Research Institute for the Built Environment","GIS technology","","","",""
"uuid:63f6cd3d-a9d3-4b36-8ab2-1299c09da287","http://resolver.tudelft.nl/uuid:63f6cd3d-a9d3-4b36-8ab2-1299c09da287","Near-field resonance at far-field-induced transparency in diffractive arrays of plasmonic nanorods","Rodriguez, S.R.K.; Janssen, O.T.A.; Lozano, G.; Omari, A.; Hens, Z.; Gomez Rivas, J.","","2013","We numerically demonstrate that a periodic array of metallic nanorods sustains a maximum near-field enhancement and a far field (FF)-induced transparency at the same energy and in-plane momentum. The coupling of bright and dark plasmonic lattice resonances, and electromagnetic retardation along the nanorod length, are responsible for this effect. A standing wave with a quadrupolar field distribution is formed, giving rise to a collective suppression of FF scattering and simultaneously enhanced local fields.","","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","IST/Imaging Science and Technology","","","",""
"uuid:c05a3d36-2ad9-4833-9920-e27bd39d4ee9","http://resolver.tudelft.nl/uuid:c05a3d36-2ad9-4833-9920-e27bd39d4ee9","Graphene based piezoresistive pressure sensor","Zhu, S.E.; Ghatkesar, M.K.; Zhang, C.; Janssen, G.C.A.M.","","2013","We present a pressure sensor based on the piezoresistive effect of graphene. The sensor is a 100?nm thick, 280??m wide square silicon nitride membrane with graphene meander patterns located on the maximum strain area. The multilayer, polycrystalline graphene was obtained by chemical vapor deposition. Strain in graphene was generated by applying differential pressure across the membrane. Finite element simulation was used to analyze the strain distribution. By performing electromechanical measurements, we obtained a gauge factor of ?1.6 for graphene and a dynamic range from 0?mbar to 700?mbar for the pressure sensor.","chemical vapour deposition; finite element analysis; graphene; piezoresistive devices; pressure sensors; silicon compounds","en","journal article","American Institute of Physics","","","","","","","","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:de68357b-86e4-45dc-9082-823ea8590c82","http://resolver.tudelft.nl/uuid:de68357b-86e4-45dc-9082-823ea8590c82","D1.3 Inventarisatie Standaardisatieveld Energie, Geo en Overheidsdomein: Combineren van Energie en Ruimte Informatie Standaarden als Enabler voor Smart Grids","Verhoosel, J.; Janssen, P.; De Vries, M.","","2013","","","nl","report","Cerise SG","","","","","","","","OTB Research Institute for the Built Environment","GIS technology","","","",""
"uuid:37f4791c-47c2-46fd-b452-610c6c8f34a9","http://resolver.tudelft.nl/uuid:37f4791c-47c2-46fd-b452-610c6c8f34a9","Risk-based asset management of a navigation network","Van der Toorn, A.; Van der Wiel, W.D.; De Rooij, M.; Janssen, H.; Kiljan, D.J.","","2013","","","en","conference paper","IABSE","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:2843bd18-01dc-415b-ab3b-0db080969226","http://resolver.tudelft.nl/uuid:2843bd18-01dc-415b-ab3b-0db080969226","Simulating public private networks as evolving systems","Deljoo, A.; Janssen, M.F.W.H.A.; Klievink, A.J.","","2013","Public-private service networks (PPSN) consist of social and technology components. Development of PPSN is ill-understood as these are dependent on a complex mix of interactions among stakeholders and their technologies and is influenced by contemporary developments. The aim of this paper is to advance our understanding of PPSN by modeling its evolution. Agent-based modeling (ABM) is used to understand and analyses self-organization and emergent aspects. In a case study of the vehicle administration we show the evolution of PPSN including changes in the structure of network.","Agent-based modeling; agent-based simulation; complex adaptive system; public-private service network; operations; social network","en","conference paper","ECMS","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:a9421f01-d469-479b-b4ba-4b8b638042eb","http://resolver.tudelft.nl/uuid:a9421f01-d469-479b-b4ba-4b8b638042eb","Double Zernike expansion of the optical aberration function from its power series expansion","Braat, J.J.M.; Janssen, A.J.E.M.","","2013","Various authors have presented the aberration function of an optical system as a power series expansion with respect to the ray coordinates in the exit pupil and the coordinates of the intersection point with the image field of the optical system. In practical applications, for reasons of efficiency and accuracy, an expansion with the aid of orthogonal polynomials is preferred for which, since the 1980s, orthogonal Zernike polynomials have become the reference. In the literature, some conversion schemes of power series coefficients to coefficients for the corresponding Zernike polynomial expansion have been given. In this paper we present an analytic solution for the conversion problem from a power series expansion in three or four dimensions to a double Zernike polynomial expansion. The solution pertains to a general optical system with four independent pupil and field coordinates and to a system with rotational symmetry in which case three independent coordinate combinations have to be considered. The conversion of the coefficients is analytically in closed form and the result is independent of a specific sampling scheme or sampling density as this is the case for the commonly used least squares fitting techniques. Computation schemes are given that allow the evaluation of coefficients of arbitrarily high order in pupil and field coordinates.","","en","journal article","Optical Society of America","","","","","","","","Applied Sciences","IST/Imaging Science and Technology","","","",""
"uuid:8ec77e83-8406-47d3-8705-32633619ba1f","http://resolver.tudelft.nl/uuid:8ec77e83-8406-47d3-8705-32633619ba1f","From Geo-data to Linked Data: Automated Transformation from GML to RDF","Van den Brink, L.; Janssen, P.; Quak, W.","","2013","Linked data provide an alternative route for dissemination of spatial information as compared to the traditional SOA-based SDI approach. Where the latter is built on predefined structuring of semantics within domains, linked data is open to linking information to any data over the Web. In this respect both are complementary. The traditional approach providing a mechanism for a basis of standardized and structured data within domains, and linked data providing an open mechanism for sharing and combining. GML as the ISO standard for exchange of service based spatial data and RDF as the linked data format are therefore related. GML provides the format in which many spatial datasets are available and exchanged. This standardization process and effort has been realized on a large scale. Why not let the web of linked data take advantage of this effort? This article will focus on the use of GML structured data as a source for deriving RDF structured data. The first part of the paper focusses on deriving linked data from GML data. The first version of GML, v1.0, was based on RDF. From version 2.0 onwards GML was based on XML and XML Schema, but the object-property structure was retained. We describe a transformation for translating any correctly structured GML to RDFS/OWL automatically, using XSLT. Because GML’s object-property structure translates very well to triples, the transformation is straightforward. Well-known GML content elements such as names and descriptions are mapped to their RDF equivalent. However, any semantics specific to the input GML data (a.k.a. the application schema) are ignored in this translation. In the second part, we study how more meaningful RDF can be created from GML, given the underlying information model, by transforming it from UML to RDFS/OWL. There exists a straightforward mapping to convert a UML model into a RDFS/OWL vocabulary. However, the re-use of existing concepts in vocabularies takes a central role in RDFS/OWL while in UML the use of vocabularies is not supported. We describe how annotating the UML model could improve this translation.","","en","journal article","Geonovum","","","","","","","","OTB Research Institute for the Built Environment","OTB Research","","","",""
"uuid:b7daf073-682d-4625-94e0-456ae2151917","http://resolver.tudelft.nl/uuid:b7daf073-682d-4625-94e0-456ae2151917","The Evolution of Inhomogeneous Wave Statistics through a Variable Medium","Smit, P.B.; Janssen, T.T.","","2013","The interaction of ocean waves with variable currents and topography in coastal areas can result in inhomogeneous statistics because of coherent interferences, which affect wave-driven circulation and transport processes. Stochastic wave models, invariably based on some form of the radiative transfer equation (or action balance), do not account for these effects. The present work develops and discusses a generalization of the radiative transfer equation that includes the effects of coherent interferences on wave statistics. Using multiple scales, the study approximates the transport equation for the (complete) second-order wave correlation matrix. The resulting model transports the coupled-mode spectrum (a form of the Wigner distribution) and accounts for the generation and propagation of coherent interferences in a variable medium. The authors validate the model through comparison with analytic solutions and laboratory observations, discuss the differences with the radiative transfer equation and the limitations of this approximation, and illustrate its ability to resolve coherent interference structures in wave fields such as those typically found in refractive focal zones and around obstacles.","gravity waves; oceanic waves; stochastic models","en","journal article","American Meteorological Society","","","","","","","2014-03-01","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:85377a72-5fc3-4777-b008-e54279f002d8","http://resolver.tudelft.nl/uuid:85377a72-5fc3-4777-b008-e54279f002d8","Ionic Liquids for Sea Mining and Waste Water Purification","Janssen, C.H.C.","Witkamp, G.J. (promotor); Kobrak, M.N. (promotor)","2013","","","en","doctoral thesis","","","","","","","","","Applied Sciences","Biotechnology","","","",""
"uuid:402b91f8-8b85-4c7c-9cc0-086471d5ebd8","http://resolver.tudelft.nl/uuid:402b91f8-8b85-4c7c-9cc0-086471d5ebd8","Evo-Devo in the Sky","Janssen, P.","","2013","Designers interested in applying evo-devo-design methods for performance based multi-objective design exploration have typically faced two main hurdles: its too hard and too slow. An evo-devo-design method is proposed that effectively overcomes the hurdles of skill and speed by leveraging two key technologies: computational workflows and cloud computing. In order to tackle the skills hurdle, Workflow Systems are used that allow users to define computational workflows using visual programming techniques. In order to tackle the speed hurdle, cloud computing infrastructures are used in order to allow the evolutionary process to be parallelized. We refer to the proposed method as Evo-Devo In The Sky (EDITS). This paper gives an overview of both the EDITS method and the implementation of a software environment supporting the EDITS method. Finally, a case-study is presented of the application of the EDITS method.","evolutionary algorithms; multi-objective optimisation; workflow system; cloud computing; parametric modelling","en","conference paper","","","","","","","","","","","","","",""
"uuid:f50c8dcb-5837-46bd-ba14-9d042da7695d","http://resolver.tudelft.nl/uuid:f50c8dcb-5837-46bd-ba14-9d042da7695d","Graphene Synthesis","Zhu, S.; Janssen, G.C.A.M.","","2013","","","en","patent","European Patent Office","","","","","","","","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:f028ac5e-00cc-4977-b1f1-902c252197f5","http://resolver.tudelft.nl/uuid:f028ac5e-00cc-4977-b1f1-902c252197f5","Technologische krachten in het bestuur","Janssen, M.F.W.H.A.","","2013","","Intreerede","en","public lecture","Delft University of Technology","","","","","","","","Technology, Policy and Management","Engineering Systems and Services","","","",""
"uuid:8a35290d-b50d-4a0e-8c90-19cb045dff13","http://resolver.tudelft.nl/uuid:8a35290d-b50d-4a0e-8c90-19cb045dff13","High optical efficiency and photon noise limited sensitivity of microwave kinetic inductance detectors using phase readout","Janssen, R.M.J.; Baselmans, J.J.A.; Endo, A.; Ferrari, L.; Yates, S.J.C.; Baryshev, A.M.; Klapwijk, T.M.","","2013","We demonstrate photon noise limited performance in both phase and amplitude readout in microwave kinetic inductance detectors (MKIDs) consisting of NbTiN and Al, down to 100 fW of optical power. We simulate the far field beam pattern of the lens-antenna system used to couple radiation into the MKID and derive an aperture efficiency of 75%. This is close to the theoretical maximum of 80% for a single-moded detector. The beam patterns are verified by a detailed analysis of the optical coupling within our measurement setup.","","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","QN/Quantum Nanoscience","","","",""
"uuid:bd9c9bbc-2264-468b-a237-17d9d53efc7f","http://resolver.tudelft.nl/uuid:bd9c9bbc-2264-468b-a237-17d9d53efc7f","Dynamic Capabilities for Information Sharing: XBRL Enabling Business-to-Government Information Exchange","Janssen, M.F.W.H.A.; Tan, Y.","","2014","Recent scandals have stressed the need for information sharing among companies and governments. The sharing of information is not easy as companies want to keep their administrative burden low, whereas governments need high information quality. These drivers have resulted in the initiating of programs for developing infrastructures for information sharing. In these programs public and private organizations work together to create infrastructures satisfying the needs of both companies and governments. The creation of business-to-government information sharing is complex and meets many organizational and technical challenges. Information sharing requires that existing information assets are used and combined, information sharing and processing capabilities are used. This would be need to be done repeatedly and rapidly in different sectors. This study investigates the dynamic capabilities necessary to realize the information sharing. Specifically the capabilities for developing the infrastructure and the governance of the infrastructure are investigated. Our analysis shows that companies and public organizations need to create a different set of capabilities to enable information sharing. The creation of information sharing requires extensive knowledge about the existing landscape. The infrastructure should be flexible enough to support the different situations and governance is necessary to ensure that information sharing arrangements are customized for the situation at hand and to make decisions concerning its further development.","","en","journal article","IEEE","","","","","","","","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:04d8d8e4-e55a-4d05-9526-6e1acd3df91c","http://resolver.tudelft.nl/uuid:04d8d8e4-e55a-4d05-9526-6e1acd3df91c","Ballistic transport in graphene grown by chemical vapor deposition","Calado, V.E.; Zhu, S.E.; Goswami, S.; Xu, Q.; Watanabe, K.; Taniguchi, T.; Janssen, G.C.A.M.; Vandersypen, L.M.K.","","2014","In this letter, we report the observation of ballistic transport on micron length scales in graphene synthesised by chemical vapour deposition (CVD). Transport measurements were done on Hall bar geometries in a liquid He cryostat. Using non-local measurements, we show that electrons can be ballistically directed by a magnetic field (transverse magnetic focussing) over length scales of ?1??m. Comparison with atomic force microscope measurements suggests a correlation between the absence of wrinkles and the presence of ballistic transport in CVD graphene.","","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","QN/Quantum Nanoscience","","","",""
"uuid:719c9c4c-50eb-4a72-8303-cf0ddffcf5dd","http://resolver.tudelft.nl/uuid:719c9c4c-50eb-4a72-8303-cf0ddffcf5dd","North Sea STAR Spreading Transnational Results; Targeted Analysis 2013/2/23; Main Report, Final Report Version 31/03/2014","Zonneveld, W.A.M.; Shaw, D.; Kidd, S.; McGowan, L.; Jay, S.; Langeland, O.; Samuelson, S.; Balz, V.; Spaans, M.; Janssen, H.; Klenke, T.; Clausen, A.; Koch, B.; Abdul-Malak, D.; Lorenzo Alonso, A.","","2014","","","en","report","ESPON & the University of Liverpool","","","","","","","","Architecture and The Built Environment","Urbanism","","","",""
"uuid:84f50724-7017-46db-882a-5e10426f195d","http://resolver.tudelft.nl/uuid:84f50724-7017-46db-882a-5e10426f195d","Source positioning in a large-scale tiny-sensor network of arbitrary topology","Penkin, D.; Janssen, G.J.M.; Yarovoy, A.","","2014","To effectively localise a source node in a dense wireless tiny-sensor network with an arbitrary 2D/3D node distribution, a novel approach suitable to describe the hop progress of source-to-sink path in such a system is proposed. In this approach, the network topology is described as a regular lattice and relates the statistical parameters of the hop count in the source-to-sink propagation path to the fractal properties of a percolating cluster. Based on this approach, a mathematical model is developed to estimate the probability P(r,t) of successful reception of the message by a sink node spaced at distance r from a source in a given time t. The accuracy analysis of the positioning method demonstrates its high performance for the very broad spectrum of values of the occupation probability pocc.","random network; lattice model; percolation theory; multihop channel; hop count; source-to-sink path; localization algorithm; OA-Fund TU Delft","en","journal article","Springer","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics","","","",""
"uuid:a8f363db-dc30-496f-9ecd-ff1ce41097b1","http://resolver.tudelft.nl/uuid:a8f363db-dc30-496f-9ecd-ff1ce41097b1","Special Issue on Innovation through Open Data: A Review of the State-of-the-Art and an Emerging Research Agenda: Guest Editors’ Introduction","Zuiderwijk, A.M.G.; Helbig, N.; Gil-García, J.R.; Janssen, M.F.W.H.A.","","2014","For decades good governance scholarship has focused attention on the importance of government openness [26], [34]. Since the 1960s, Freedom of Information (FOI) legislation has formed the backbone of institutional support for opening information and documents [76] and participatory processes [4], [79]. However, FOI represents a passive approach to releasing information. Persons or organizations must still request the information they want, referred to casually, as freedom of information requests. Since the 1990s, publishing documents on websites or using communication technologies to engage citizens in participation processes has signaled a more proactive approach to releasing government information and political engagement. Since 2003, governments have re-envisioned their passive and proactive approaches to include an open data agenda, [18], [62], where publishing documents and data in open formats, [35], [63] is the preferred way. Collectively, these developments have forged the basis for what has been commonly referred to as the open government and data movements [30]. Open data practices and policies are praised for their potential to generate public value, particularly through innovation, economic growth, and transparency, [5], [9], [18], [21], [81]. The nature and character of open data has been hailed for its innovative capacity and transformative power [19], [35], [40], [45], [80]. Various studies have confirmed that proactively releasing public and private data in open formats creates considerable benefits for citizens, researchers, companies and other stakeholders, such as business creation or having the ability to understand public or private problems in new ways through advanced data analytics, [5], [9], [18], [21], [81]. Only a handful of articles examine both the unintended consequences and negative side effects of opening data, [33] and the underlying causal mechanisms that actually lead to the desired open data benefits [5]. Open data research is still in its infancy, and as a result, the extant literature uses limited application and development of theory toward understanding the open data phenomenon. While scholars acknowledge diverse perspectives, it is not clear which theories are most relevant, nor whether a single or integrated theory is needed. This special issue is part of a series of two special issues about open data. This issue focuses on the relationship between innovation and open data, while the second special issue emphasizes research on open data related to transparency and open data policies. To realize the practical benefits of this transformative practice and to develop theory, more research needs to focus on understanding how innovation occurs through open data activities. The papers in this special issue begin to address this gap. The introductory article discusses the state-of-the-art with respect to understanding the context of open data innovation, developments, challenges and barriers, presents an overview of open data research and outlines emerging research directions.","","en","journal article","University of Talca, Faculty of Engineering","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:288c0ce7-70cf-42b9-90a9-05408edc33a8","http://resolver.tudelft.nl/uuid:288c0ce7-70cf-42b9-90a9-05408edc33a8","Innovation with open data: Essential elements of open data ecosystems","Zuiderwijk, A.M.G.; Janssen, M.F.W.H.A.; Davis, C.B.","","2014","Open data ecosystems are expected to bring many advantages, such as stimulating citizen participation and innovation. However, scant attention has been given to what constitutes an open data ecosystem. The objective of this paper is to provide an overview of essential elements of open data ecosystems for enabling easy publication and use of open data. To achieve this objective, the literature has been reviewed and a scenario about the publication and use of open data has been analyzed. It was found that various applications, tools and portals are available which together can form an ecosystem. The best functionalities of this ecosystem can be selected and utilized by open data providers and users. To create an open data ecosystem at least four key elements should be captured, namely, 1) releasing and publishing open data on the internet, 2) searching, finding, evaluating and viewing data and their related licenses, 3) cleansing, analyzing, enriching, combining, linking and visualizing data and 4) interpreting and discussing data and providing feedback to the data provider and other stakeholders. Furthermore, to integrate the ecosystem elements and to let them act as an integrated whole, there should be three additional elements 5) user pathways showing directions for how open data can be used, 6) a quality management system and 7) different types of metadata to be able to connect the elements.","open data ecosystem; open data; open government; ecosystem; architecture; infrastructure; innovation","en","journal article","IOS Press","","","","","","","2015-06-19","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:1778264b-c15c-49cf-9833-e95f5ec58194","http://resolver.tudelft.nl/uuid:1778264b-c15c-49cf-9833-e95f5ec58194","Design Principles for Improving the Process of Publishing Open data","Zuiderwijk, A.M.G.; Janssen, M.F.W.H.A.; Choenni, R.; Meijer, R.F.","","2014","· Purpose: Governments create large amounts of data. However, the publication of open data is often cumbersome and there are no standard procedures and processes for opening data. This blocks the easy publication of government data. The purpose of this paper is to derive design principles for improving the open data publishing process of public organizations. · Design/methodology/approach: Action Design Research (ADR) was employed to derive design principles. The literature was used as a foundation, and discussion sessions with civil servants were used to evaluate the usefulness of the principles. · Findings: Barriers preventing easy and low-cost publication of open data were identified and connected to design principles, which can be used to guide the design of an open data publishing process. Five new principles are 1) start thinking about the opening of data at the beginning of the process, 2) develop guidelines, especially about privacy and policy sensitivity of data, 3) provide decision support by integrating insight in the activities of other actors involved in the publishing process, 4) make data publication an integral, well-defined and standardized part of daily procedures and routines, 5) monitor how the published data are reused. · Research limitations/implications: The principles are derived using ADR in a single case. A next step can be to investigate multiple comparative case studies and detail the principles further. We recommend using these principles to develop a reference architecture. · Practical implications: The design principles can be used by public organizations to improve their open data publishing processes. The design principles are derived from practice and discussed with practitioners. The discussions showed that the principles could improve the publication process. · Social implications: Decreasing the barriers for publishing open government data could result in the publication of more open data. These open data can then be used and stimulate various public values, such as transparency, accountability, innovation, economic growth and informed decision and policy-making. · Originality/value: Publishing data by public organizations is a complex and ill-understood activity. The lack of suitable business processes and the unclear division of responsibilities blocks publication of open data. This paper contributes to the literature by presenting design principles which can be used to improve the open data publishing process of public sector organizations.","open data; e-government; publishing process; principles; business process reengineering; action design research","en","journal article","Emerald Group Publishing Limited","","","","","","","","Technology, Policy and Management","Engineering Systems and Services","","","",""
"uuid:5bbb7f8a-1838-4e2c-824e-48f1ef3064fc","http://resolver.tudelft.nl/uuid:5bbb7f8a-1838-4e2c-824e-48f1ef3064fc","Developing Multi-Layer Information Infrastructures: Advancing Social Innovation through Public–Private Governance","Klievink, A.J.; Janssen, M.F.W.H.A.","","2014","Information infrastructures of businesses and government are increasingly interwoven and highly dependent on each other. Though often referred to as sociotechnical innovations, the development of these information infrastructures often has a technological focus. The related and even concurrent development of new social practices is understudied. As a result, the social innovation taking place next to the development of large-scale information infrastructures is ill understood. To address this gap, we study public-private information infrastructure developments at three layers and over a prolonged period of time and focus on the innovation in the social practices. Our goal is to understand the social innovation that is taking place within and among these layers and within their technological context. A finding was that stakeholders face changes in their existing practices and have to alter them as a pre-condition to realize the benefits that information infrastructures promise to provide. New social practices need to be developed and sustaining the innovation requires the development of governance mechanisms.","information infrastructures; social innovation; publicprivate collaboration; governance; e-government; transformation","en","journal article","Taylor & Francis","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:50f8e4d8-e336-4dd5-a07f-b260c67fa727","http://resolver.tudelft.nl/uuid:50f8e4d8-e336-4dd5-a07f-b260c67fa727","A comparison of hallux valgus angles assessed with computerised plantar pressure measurements, clinical examination and radiography in patients with diabetes","Janssen, D.M.; Sanders, A.P.; Guldemond, N.A.; Hermus, J.; Walenkamp, G.H.; Van Rhijn, L.W.","","2014","Background Hallux valgus deformity is a common musculoskeletal foot disorder with a prevalence of 3.5% in adolescents to 35.7% in adults aged over 65 years. Radiographic measurements of hallux valgus angles (HVA) are considered to be the most reproducible and accurate assessment of HVA. However, in European countries, many podiatrists do not have direct access to radiographic facilities. Therefore, alternative measurements are desired. Such measurements are computerised plantar pressure measurement and clinical goniometry. The purpose of this study was to establish the agreement of these techniques and radiographic assessments. Methods HVA was determined in one hundred and eighty six participants suffering from diabetes. Radiographic measurements of HVA were performed with standardised static weight bearing dorsoplantar foot radiographs. The clinical goniometry for HVA was measured with a universal goniometer. Computerised plantar pressure measurement for HVA was executed with the EMED SF-4® pressure platform and Novel-Ortho-Geometry software. The intra-class correlation coefficients (ICC) and levels of agreement were analysed using Bland & Altman plots. Results Comparison of radiographic measurements to clinical goniometry for HVA showed an intraclass correlation coefficient (ICC) of 0.81 (95% confidence interval, 0.76 to 0.86; p<0.001). Radiographic measurement versus computerised plantar pressure measurement showed an ICC of 0.59 (95% confidence interval, 0.49 to 0.68; p<0.001). In addition, clinical goniometry versus computerised plantar pressure measurement showed an ICC of 0.77 (95% confidence interval, 0.70 to 0.82; p<0.001). The systematic difference of the computerised plantar pressure measurement compared with radiographic measurement and clinical goniometry was 7.0 degrees (SD 6.8) and 5.2 degrees (SD 5.0), respectively. The systemic difference of radiographic measurements compared with clinical goniometry was 1.8 degrees (SD 5.0). Conclusions The agreement of computerised plantar pressure measurement and clinical goniometry for HVA compared to radiographic measurement of HVA is unsatisfactory. Radiographic measurements of HVA and clinical goniometry for HVA yield better agreement compared to radiographic measurements and computerised plantar pressure measurement. The traditional radiographic measurement techniques are strongly recommended for the assessment of HVA","OA-Fund TU Delft","en","journal article","BioMed Central","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Man-machine Interaction","","","",""
"uuid:c0f6c1f8-be5f-455a-9d5c-b94d6acabd60","http://resolver.tudelft.nl/uuid:c0f6c1f8-be5f-455a-9d5c-b94d6acabd60","CERISE - Combineren van energie en ruimte informatie standaarden als enabler voor smart grids - TKI smart grid project: TKISG01010 - D2.1 Use case energy balancing information facility. Werkpakket 20","Verhoosel, J.; Roes, J.; Verbeek, S.; Bruinenberg, J.; van Doorn, L.; Janssen, P.; De Vries, M.E.","","2014","Versie 1.1 – English summary - Final","","en","report","CERISE CG","","","","","","","","Architecture and The Built Environment","OTB Research","","","",""
"uuid:3b1445f4-20ee-4e32-a4ff-82e8170dbde4","http://resolver.tudelft.nl/uuid:3b1445f4-20ee-4e32-a4ff-82e8170dbde4","Special Issue on Transparency and Open Data Policies: Guest Editors’ Introduction","Zuiderwijk, A.M.G.; Gascó, M.; Parycek, P.; Janssen, M.F.W.H.A.","","2014","Literature and policy reports suggest that open data can be used as a tool to enhance transparency. However, several researchers have challenged the idea that the release of government data will result in increased transparency and the idea that transparency automatically leads to more trust in the government. Moreover, transparency may have undesired effects. Limited research has been conducted on these sometimes conflicting findings and challenges, and on how open data policies should deal with this. It is not clear what encompasses an effective open data policy and how this influences transparency. The papers in this special issue contribute to this area. In the introduction of this special issue we present the state-of-the-art with regard to definitions, developments, research, challenges and barriers related to open data transparency and open data policies. Finally, a summary of the papers included in this special issue is provided.","open data; transparency; policies","en","journal article","Universidad de Talca, Chile","","","","","","","","Technology, Policy and Management","ESS","","","",""
"uuid:95efcfad-ae88-4e1e-95e6-2be2cd37015c","http://resolver.tudelft.nl/uuid:95efcfad-ae88-4e1e-95e6-2be2cd37015c","Interconnecting Governments, Businesses and Citizens: A Comparison of Two Digital Infrastructures","Klievink, A.J.; Zuiderwijk-van Eijk, A.M.G.; Janssen, M.F.W.H.A.","","2014","Public and private organizations in various areas are setting up digital Information Infrastructures (IIs) for interconnecting government, businesses and citizens. IIs can create value by sharing and integrating data of multiple ac-tors. This can be the basis for value added services and especially collaborations of public and private partners can make IIs thrive. Easier access to integrated services and products (jointly) offered by government and businesses may stimulate transparency and innovations. IIs are under development in many do-mains, including for open data and international trade. However, there are nota-ble differences in the design, characteristics and implementation of the IIs. The objective of this paper is to compare two diverse IIs in order to obtain a better understanding of common and differing elements in the IIs and their impact. Among the differences are the roles of government, businesses and users, in driving, developing and exploitation of the IIs.","public-private networks; digital infrastructure; information infrastructure; platforms; information exchange; broker; e-government","en","book chapter","Springer","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:112acd8d-26a2-4338-bb10-f3dc45687609","http://resolver.tudelft.nl/uuid:112acd8d-26a2-4338-bb10-f3dc45687609","Multi-Perspective Urban Optioneering","Janssen, P.; Stouffs, R.M.F.","","2014","This paper investigates the state-of-the-art with respect to simulation-based planning support systems in order to draw a set of requirements and best practices for an urban planning and design framework that enables multiple stakeholders with differing perspectives to systematically explore design options, leveraging the latest analysis and simulation techniques. From these requirements and best practices, the foundations and structure of such an urban planning and design framework are developed. A number of technological and methodological challenges are identified for future investigation.","urban planning and design; optioneering; simulation-based planning; support systems","en","conference paper","eCAADe, Northumbria University","","","","","","","","Architecture and The Built Environment","Architectural Engineering +Technology","","","",""
"uuid:8e6232a9-4413-4862-963c-2ca3f5003ad6","http://resolver.tudelft.nl/uuid:8e6232a9-4413-4862-963c-2ca3f5003ad6","Impact of a half-space interface on the wireless link between tiny sensor nodes","Penkin, D.; Janssen, G.; Yarovoy, A.","","2014","The power budget of a wireless link between two electrically small sensor nodes located close to an interface between two media is studied. The model includes both the propagation channel losses and input impedance of the radio frequency antennas. It is shown that a highly inductive half-space significantly enhances the received power due to the contribution of the surface wave while not resulting in considerable mismatch losses between the antennas and electronics. Hence, such a half-space improves the link gain, which may compensate the limited energy available for transmission from electrically and physically small nodes.","surface waves; link gain; input impedance; electrically small dipoles; surface impedance; The Green's function","en","journal article","American Geophysical Union","","","","","","","2015-04-01","Electrical Engineering, Mathematics and Computer Science","Microelectronics","","","",""
"uuid:98699799-6439-437d-965b-cb89739ef655","http://resolver.tudelft.nl/uuid:98699799-6439-437d-965b-cb89739ef655","Factors Influencing the Adoption of and Business Case for Cloud Computing in the Public Sector","Kuiper, E.; Van Dam, F.; Reiter, A.; Janssen, M.F.W.H.A.","","2014","Cloud adoption in the public sector is taking off slowly, which is perceived as a problem. Models of factors influencing cloud adoption are derived for better understanding using literature and results obtained via desk research and surveys by the Cloud for Europe project. We conclude that several factors require further research, such as the culture in countries, climate, legislation, economics and politics, IT staff shortage and feelings of uncertainty, fear and impatience. Adoption factors have impact on the business case for cloud computing. Hence a business case template to compare cloud scenarios with zero scenarios is developed. We recommend to use the risk-adjusted balance between benefits and costs to decide on cloud adoption instead of focussing only on the benefits of cloud computing. Although this makes the business case for adoption of cloud computing less favourable, it provides a more realistic picture leading to sustainable decisions on cloud adoption.","","en","conference paper","IIMC International Information Management Corporation","","","","","","","","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:bca328f1-100b-4a06-a383-db3e51ba1674","http://resolver.tudelft.nl/uuid:bca328f1-100b-4a06-a383-db3e51ba1674","Data Infrastructures for Asset Management Viewed as Complex Adaptive Systems","Brous, P.A.; Overtoom, I.; Herder, P.M.; Versluis, A.; Janssen, M.F.W.H.A.","","2014","Data infrastructures represent information about physical reality. As reality changes, data infrastructures might also be subject to change. Researchers have increasingly approached physical infrastructures as being complex adaptive systems (CAS). Although physical infrastructures are often approached as CAS, the underlying data infrastructures hardly are. Studying data infrastructures as CAS has significant implications for our understanding of them. A CAS lens will help us to identify and better understand their key elements and coordination mechanisms for their functioning and dealing with change. Accepting data infrastructures as CASs also means we need to understand the consequences for their development. On the basis of state of the art literature, and an explorative case study of Rijkswaterstaat in the Netherlands, an overview of known data infrastructural elements and the coordination mechanisms connecting them will be presented. The results show that successful development of data infrastructures requires consideration of a wide variety of elements that can be coordinated using various coordination mechanisms. We conclude that a more complete picture of what data infrastructures are and how they can be coordinated is needed.","data; infrastructure; complexity; coordination","en","journal article","Elsevier","","","","","","","","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:e9a68745-e209-41b6-9037-0ebe438d642d","http://resolver.tudelft.nl/uuid:e9a68745-e209-41b6-9037-0ebe438d642d","Open Data: Growing Up and Getting Specific","Höchtl, J.; Davies, T.; Janssen, M.F.W.H.A.; Schieferdecker, I.","","2014","Open data has been given a lot of attention in the public. In some situation ‘open by default’ has become established as a core principle, whereas others argue about the limited results and the lack of robust studies demonstrating the value, and point to the risk that open data might turn out to be a short lived policy fad. This special issue contains a variety of research papers addressing this topic from different views and providing recent research results on open data. The papers in this issue deepen the understanding of open data and show that the subject of open data is moving from the general to the study of specifics. The special issue also includes invited papers presented at the first public meeting of the SharePSI project. Share-PSI 2.0 is the European network for the exchange of experience and ideas around implementing open data policies in the public sector.","open data; engagement; participation; geo-spatial; ICT4D","en","journal article","","","","","","","","","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:ae1167c7-d246-4255-9419-800ac8d805e8","http://resolver.tudelft.nl/uuid:ae1167c7-d246-4255-9419-800ac8d805e8","Linking spatial data: Automated conversion of geo-information models and GML data to RDF","Van den Brink, L.; Janssen, P.; Quak, W.; Stoter, J.E.","","2014","Linked data provide an alternative route for the dissemination of spatial information compared to the traditional SOA-based SDI approach. The traditional approach has provided a wealth of standardized and structured location data based on Geography Markup Language (GML), while linked data provides an open mechanism for sharing and combining this data with anything, once the data is available as linked data. The first part of the paper focuses on deriving linked data from GML data. In the second part, we study how more meaningful data, expressed in Resource Description Framework (RDF) can be created from GML, given the underlying information model, by transforming it from Unified Modeling Language (UML) to Web Ontology Language (OWL).","SDI; Linked Data; Semantic Web; GML; RDF","en","journal article","European Commission Joint Research Centre","","","","","","","","Architecture and The Built Environment","OTB","","","",""
"uuid:da81b9cc-258c-46e6-8525-cc70c2aa8667","http://resolver.tudelft.nl/uuid:da81b9cc-258c-46e6-8525-cc70c2aa8667","North Sea STAR Spreading Transnational Results; Targeted Analysis 2013/2/23; Executive Summary, Final Report | Version 31/03/2014","Zonneveld, W.A.M.; Shaw, D.; Kidd, S.; McGowan, L.; Jay, S.; Langeland, O.; Samuelson, S.; Balz, V.; Spaans, M.; Janssen, H.; Klenke, T.; Clausen, A.; Koch, B.; Abdul-Malak, D.; Lorenzo Alonso, A.","","2014","","","en","report","ESPON & the University of Liverpool","","","","","","","","Architecture and The Built Environment","Urbanism","","","",""
"uuid:9c5be2e2-26ce-4517-b363-e0ec281909af","http://resolver.tudelft.nl/uuid:9c5be2e2-26ce-4517-b363-e0ec281909af","North Sea STAR Spreading Transnational Results; Targeted Analysis 2013/2/23; Scientific Report; Final Report | Version 31/03/2014","Zonneveld, W.A.M.; Shaw, D.; Kidd, S.; McGowan, L.; Jay, S.; Langeland, O.; Samuelson, S.; Balz, V.; Spaans, M.; Janssen, H.; Klenke, T.; Clausen, A.; Koch, B.; Abdul-Malak, D.; Lorenzo Alonso, A.","","2014","","","en","report","ESPON & the University of Liverpool","","","","","","","","Architecture and The Built Environment","Urbanism","","","",""
"uuid:4d3b0a34-c135-41f5-894e-c9973976114c","http://resolver.tudelft.nl/uuid:4d3b0a34-c135-41f5-894e-c9973976114c","TOWARDS ON-TIME PASSENGER HANDLING - CASE STUDY RESEARCH ON THE REQUIRED SERVICE CAPACITY FOR AN ON-TIME PASSENGER-HANDLING PROCESS AT THE GATE","Janssen, H.","Beelaerts van Blokland, W.W.A. (mentor)","2015","","","","master thesis","","","","","","","","2019-05-06","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Transport Engineering and Logistics","","",""
"uuid:96293c5c-e8a5-49dd-a1f4-b5b86a9dbf69","http://resolver.tudelft.nl/uuid:96293c5c-e8a5-49dd-a1f4-b5b86a9dbf69","Molecular dynamics simulation of graphene on Cu (1 0 0) and (1 1 1) surfaces","Klaver, T.P.C. (TU Delft (OLD) MSE-7); Zhu, S. (TU Delft Micro and Nano Engineering); Sluiter, M.H.F. (TU Delft (OLD) MSE-7); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering)","","2015","","CWTS 0.75 <= JFIS < 2.00","en","journal article","","","","","","Accepted Author Manuscript","","2017-02-28","","","(OLD) MSE-7","","",""
"uuid:14436271-47d3-4570-abeb-c48937a35822","http://resolver.tudelft.nl/uuid:14436271-47d3-4570-abeb-c48937a35822","Acceptance and use predictors of open data technologies: Drawing upon the unified theory of acceptance and use of technology","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Dwivedi, YK","","2015","","Acceptance; Adoption; Use; Open data technology; open public sector data; Open government data; Open data; UTAUT","en","journal article","","","","","","Available online 28 September 2015","","","","","Information and Communication Technology","","",""
"uuid:8ca2e63e-7551-4397-998f-3cb9e35eae3d","http://resolver.tudelft.nl/uuid:8ca2e63e-7551-4397-998f-3cb9e35eae3d","Towards decision support for disclosing data: Closed or open data?","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2015","The disclosure of open government data is a complex activity that may create public value yet might also encounter risks, such as the misinterpretation and misuse of data. While politicians support data release and assume that the positive value of open data will dominate, many governmental organizations are reluctant to open their data, as they are afraid of the dark side. The objective of this paper is to provide a decision-making model that assists in trade-offs between the pros and cons of open data. Data disclosure is dependent on the type of data (e.g. its sensitivity, structure and quality) and the context (e.g. organizational policies, legislation and the political influences). Based on the literature and fifteen in-depth interviews with public sector officials and data archivists, this paper identifies contextual and dataset-related variables which influence a trade-off. A decision-making model is presented capturing trade-offs, and in this way providing guidance for weighing the creation of public value and the risks. The model can be used for decision-making to open or not to open data. It is likely that the decision regarding which data should be opened or closed will shift over time","","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9ff25504-29c8-4c25-ae4a-6c2881b4df31","http://resolver.tudelft.nl/uuid:9ff25504-29c8-4c25-ae4a-6c2881b4df31","Benchmarks for evaluating the progress of open data adoption usage, limitations, and lessons learned","Susha, I (Orebro University); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Grönlund, Åke (Orebro University)","","2015","","open data; maturity; adoption; benchmark; index; open government; Evaluation; ranking; open data models","en","journal article","","","","","","Harvest Available online: 01-12-2014","","","","","Information and Communication Technology","","",""
"uuid:94557689-f579-40a9-8f43-c2cb89df01e6","http://resolver.tudelft.nl/uuid:94557689-f579-40a9-8f43-c2cb89df01e6","Tunable polaritons from plasmon-phonon coupling in hyperbolic media","Dai, S. (University of California); Ma, Q. (Massachusetts Institute of Technology); Zhu, S. (TU Delft Micro and Nano Engineering); Liu, Mengkun (University of California); Andersen, T. (Massachusetts Institute of Technology); Fei, Z. (University of California); Goldflam, M.D. (University of California); Wagner, M. (University of California); Watanabe, Kenji (National Institute for Materials Science); Taniguchi, T. (National Institute for Materials Science); Thiemens, M. (University of California); Keilmann, F. (Ludwig Maximilians University); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering); Jarillo-Herrero, P. (Massachusetts Institute of Technology); Fogler, M. (University of California); Basov, D.N. (University of California)","","2015","","","en","abstract","","","","","","","","","","","Micro and Nano Engineering","","",""
"uuid:c8dfd3d7-56c9-4e47-a054-e93e4c5dfaab","http://resolver.tudelft.nl/uuid:c8dfd3d7-56c9-4e47-a054-e93e4c5dfaab","Critical Factors for Open Data Publication and Use: A Comparison of City-level, Regional, and Transnational Cases","susha, Iryna (Orebro University); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Charalabidis, Yannis (University of the Aegean); Parycek, Peter (Danube University Krems); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2015","There is a lack of research concerning the factors influencing the success or failure of open data initiatives. Based on the results of two workshops, we provide a list of 47 success factors for open data publication and 18 success factors for open data use. We further use three case studies (ENGAGE, Open NY, and Open Vienna) to examine how the criticality of factors varies depending on the geographical level and other characteristics of the open data initiative. The cases, representing open data initiatives at city, regional, and transnational levels, point at different categories of critical success factors. Our key conclusions are that 1) the criticality of the factors depends considerably on the context of the open data initiative; 2) a number of success factors appear to be more universally applicable than others; 3) the factors that are critical to all three cases are derived from many different success factor categories, which suggests that open data initiatives should adopt an interdisciplinary approach, and 4) further work is needed to detail the success factors for open data publication and use in other contexts.","open data; success; success factors; level; taxonomy; e-government; case study","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9d3a4069-f48a-48fb-82a5-6dd28251174f","http://resolver.tudelft.nl/uuid:9d3a4069-f48a-48fb-82a5-6dd28251174f","Towards Modelling Data Infrastructures in the Asset Management Domain","Brous, P.A. (TU Delft Information and Communication Technology); Herder, P.M. (TU Delft Energie and Industrie); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2015","More and more asset management organizations are relying on trusted data to drive their decision making process. Yet little systematic research has been performed regarding the generation of trusted data. Trusted data has a clear, defined and consistent quality which meets the expectations of the user. The aim of the research presented in this paper is to develop a conceptual model to support asset management organizations with regards to their development of data infrastructures which produce trusted data and provide organizations with the capability to make the right decisions at the right time. The autonomous characteristics of agent-based systems and process orientation of discrete-event simulation are combined in our conceptual model. In this way both the autonomous social behavior of organizations and their business processes can be modelled. Several predefined components containing the behavior of agents through various coordination mechanisms have been developed. These components can be further customized to model an empirical situation more closely. The approach is illustrated with a case study in the asset management domain.","complex adaptive systems; CAS; data infrastructure; asset management; data quality","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:fb49646b-2294-4138-b6a3-418c453083e9","http://resolver.tudelft.nl/uuid:fb49646b-2294-4138-b6a3-418c453083e9","Challenging the Chain: Governing the Automated Exchange and Processing of Business Information","Bharosa, N.; Van Wijk, R.; De Winne, N.; Janssen, M.F.W.H.A.","","2015","What is digital business reporting? Why do we need it? And how can we improve it? This book aims to address these questions by illustrating the rise of system-to-system information exchange and the opportunities for improving transparency and accountability. Governments around the world are looking for ways to strengthen transparency and accountability without introducing more red tape, which is a source of growing frustration and costs for businesses. In 2004, the Ministry of Finance and the Ministry of Justice in the Netherlands started to investigate the potential of XBRL (eXtensible Business Reporting Language) as a uniform data standard for business-to-government information exchange. In 2006, there was a comprehensive architecture for Standard Business Reporting (SBR), including the requirements for the information infrastructure. One year later the first reports in XBRL were successfully delivered to the Tax and Customs Administration and the Chamber of Commerce via a secure infrastructure. Today, millions of business reports are being exchanged using SBR. As a solution, SBR empowers organisations to present a cohesive explanation of their business operations and helps them engage with internal and external stakeholders, including regulators, shareholders and creditors. Challenging the chain describes the journey of SBR from challenge to solution. Specialists in the field – flanked by academics – provide detailed insights on the challenges actors faced and the solutions they achieved. In its versatility, this book exemplifies the necessary paradigm shifts when it comes to such large-scale public-private transformations. Policy makers, managers, IT specialists and architects looking to engage in such transformations will find guidance in this book.","OA-Fund TU Delft","en","book","IOS Press","","","","","","","","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:d2225a78-912d-4ecf-9263-8c1492287a34","http://resolver.tudelft.nl/uuid:d2225a78-912d-4ecf-9263-8c1492287a34","Stochastic modeling of coherent wave fields over variable depth","Smit, P.B.; Janssen, T.T.; Herbers, T.H.C.","","2015","Refractive focusing of swell waves can result in fast-scale variations in the wave statistics because of wave interference, which cannot be resolved by stochastic wave models based on the radiative transport equation. Quasi-coherent statistical theory does account for such statistical interferences and the associated wave inhomogeneities, but the theory has thus far been presented in a form that appears incompatible with models based on the radiative transfer equation (RTE). Moreover, the quasi-coherent theory has never been tested against field data, and it is not clear how the coherent information inherent to such models can be used for better understanding coastal wave and circulation dynamics. This study therefore revisits the derivation of quasi-coherent theory to formulate it into a radiative transport equation with a forcing term that accounts for the inhomogeneous part of the wave field. This paper shows how the model can be nested within (or otherwise used in conjunction with) quasi-homogeneous wave models based on the RTE. Through comparison to laboratory data, numerical simulations of a deterministic model, and field observations of waves propagating over a nearshore canyon head, the predictive capability of the model is validated. The authors discuss the interference patterns predicted by the model through evaluation of a complex cross-correlation function and highlight the differences with quasi-homogeneous predictions. These results show that quasi-coherent theory can extend models based on the RTE to resolve coherent interference patterns and standing wave features in coastal areas, which are believed to be important in nearshore circulation and sediment transport.","","en","journal article","American Meteorological Society","","","","","","","2015-10-31","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:94dac4ae-391a-4784-a119-b0b35a6dcc88","http://resolver.tudelft.nl/uuid:94dac4ae-391a-4784-a119-b0b35a6dcc88","Business model metrics: An open repository","Heikkila, M.; Bouwman, W.A.G.A.; Heikkila, J.; Solaimani, S.; Janssen, W.","","2015","Development of successful business models has become a necessity in turbulent business environments, but compared to research on business modeling tools, attention to the role of metrics in designing business models in literature is limited. Building on existing approaches to business models and performance measurement literature, we develop a generic open repository of metrics related to core business model concepts. We validate and assess the practical value of the repository based on four e-Business model cases. The repository can be utilized in designing business models, specifically for networked enterprises. It is neither complete nor universally applicable, but needs adjustment with each design. Ultimately, with this paper, we hope measurement will become an integral part of the business model innovation discussion.","business model; innovation; metrics; repository; performance measure; design cases; e-Business","en","journal article","Springer","","","","","","","2016-03-15","Technology, Policy and Management","Engineering Systems and Services","","","",""
"uuid:c3e2530d-eaa2-409b-a700-b7107db7e159","http://resolver.tudelft.nl/uuid:c3e2530d-eaa2-409b-a700-b7107db7e159","Participation and Data Quality in Open Data use: Open Data Infrastructures Evaluated","Zuiderwijk-van Eijk, A.M.G.; Janssen, M.F.W.H.A.","","2015","Infrastructures may improve the use of Open Government Data (OGD) by providing insight in how individuals can participate in data reuse and in the quality of open data. Yet, most OGD infrastructures do not support such activities. The objective of this paper is to evaluate the importance and usability of participation mechanisms and data quality indicators for open data infrastructures through quasi-experiments. A quasiexperiment is an experimental evaluation method in which researchers have control over the (non-random) assignment of participants to treatment and control conditions, the selection of control conditions and the organisation of the treatment, and over the measures. Moreover, quasi-experiments usually include a pre-test (i.e. a test before the treatment or control condition) and a post-test (i.e. a test after the treatment or control condition). The results of our quasi-experiments showed that the prototype of our OGD infrastructure improved OGD participation and data quality analysis by providing functionalities including discussion messages, social media sharing, linking items related to a dataset, Wiki descriptions and discussions, and data quality ratings and reviews. Participant observations showed that participants in the treatment group found it easier to conduct tasks with the prototype related to giving feedback on and discussing open data and rating and reviewing data quality than the participants in the control group. Our study suggested that participation mechanisms and quality indicators add value and improve the use of OGD. It recommends the implementation of such mechanisms and indicators in existing OGD infrastructures. To support the creation of transparency, citizen participation and innovation with OGD, our findings suggest that participation mechanisms and data quality indicators are a condition. Yet, these mechanisms and indicators are not sufficient for ensuring the generation of the OGD benefits, since there are still many factors which hinder the generation of these benefits. We discuss a number of these factors including factors related to OGD infrastructures and factors beyond OGD infrastructures.","open data; participation; data quality; usability; experiments; infrastructure; social media","en","conference paper","ACPI","","","","","","","","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:96e13442-e5b0-4772-ad89-87998b60e551","http://resolver.tudelft.nl/uuid:96e13442-e5b0-4772-ad89-87998b60e551","Exploring factors that influence information sharing choices of organizations in networks","Singerling, T.; Klievink, A.J.; De Reuver, G.A.; Janssen, M.F.W.H.A.","","2015","Organizations do not just decide on whether or not to exchange information digitally. In many cases, there are multiple alternative configurations of inter-organizational systems (IOS) that facilitate such information sharing. Although a lot is known about the factors that influence whether organizations do or do not adopt IOS, little is known about how these factors work when organizations are choosing among multiple configurations for information sharing. This paper takes two archetypical IOS forms - dyadic and multilateral arrangements – and explores how the known antecedents affect choosing among them. To this end, a case study was conducted on the selection and development of an IOS for information sharing in a network of utility service and infrastructure providers.","IOS; configuration; choices; adoption; networks","en","conference paper","","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:5001f2de-7ce3-4cc9-b8ac-c30dd3aaac65","http://resolver.tudelft.nl/uuid:5001f2de-7ce3-4cc9-b8ac-c30dd3aaac65","Design and pilot validation of A-gear: A novel wearable dynamic arm support (+ Erratum)","Kooren, P.N.; Dunning, A.G.; Janssen, M.M.H.P.; Lobo-Prat, J.; Koopman, B.F.J.M.; Paalman, M.I.; de Groot, I.J.M.; Herder, J.L.","","2015","Background Persons suffering from progressive muscular weakness, like those with Duchenne muscular dystrophy (DMD), gradually lose the ability to stand, walk and to use their arms. This hinders them from performing daily activities, social participation and being independent. Wheelchairs are used to overcome the loss of walking. However, there are currently few efficient functional substitutes to support the arms. Arm supports or robotic arms can be mounted to wheelchairs to aid in arm motion, but they are quite visible (stigmatizing), and limited in their possibilities due to their fixation to the wheelchair. The users prefer inconspicuous arm supports that are comfortable to wear and easy to control. Methods In this paper the design, characterization, and pilot validation of a passive arm support prototype, which is worn on the body, is presented. The A-gear runs along the body from the contact surface between seat and upper legs via torso and upper arm to the forearm. Freedom of motion is accomplished by mechanical joints, which are nearly aligned with the human joints. The system compensates for the arm weight, using elastic bands for static balance, in every position of the arm. As opposed to existing devices, the proposed kinematic structure allows trunk motion and requires fewer links and less joint space without compromising balancing precision. The functional prototype has been validated in three DMD patients, using 3D motion analysis. Results Measurements have shown increased arm performance when the subjects were wearing the prototype. Upward and forward movements were easier to perform. The arm support is easy to put on and remove. Moreover, the device felt comfortable for the subjects. However, downward movements were more difficult, and the patients would prefer the device to be even more inconspicuous. Conclusion The A-gear prototype is a step towards inconspicuousness and therefore well-received dynamic arm supports for people with muscular weakness.","","en","journal article","BioMed Central","","","","","","","","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:3ef66067-0382-4ff4-a132-a98681e6c7ac","http://resolver.tudelft.nl/uuid:3ef66067-0382-4ff4-a132-a98681e6c7ac","CERISE - Combining energy and spatial information standards as enabler for smart grids - TKI smart grid project: TKISG01010 - D4.1 Semantic mappings to harmonize energy, geo and government-related information models. Work package 40","Steen, M.; Knibbe, F.; Quak, C.W.; Janssen, P.; Stap, R.; Daniele, L.","","2015","Version 1.0 - Final The CERISE-SG project (Combining Energy and Geo information standards as enabler for Smart Grids) focuses on interoperability with a special interest in the information exchanges between smart grids and their surroundings. We hereby focus on the exchange of information to and from smart grids, the government domain and the geo domain. Within the fast changing smart grid world acquiring reliable information from different sources is invaluable. The information required comes from different sources that all use their own (often different) definitions for the data they control. The national registration of buildings for instance contains different data with different definitions from the data source of energy consumption. To exchange information between these sources connections need to be made between the different areas that make sure that correct and reliable data is available. In this document we describe a process to define these mappings. First an identification of the playing field of smart grids is given and the three major domains that are involved are described i.e. (1) the utilities domain, (2) the geographic domain; and (3) the government domain. Because there are already many standardisation processing running within each domain, with different set-ups the cross domain harmonization is extra challenging. In this document we work out two solutions to the harmonization problems: - Define relationships between elements from different models - Express model elements from different models in a common model In this document we propose 'linked data' and semantic web technology as a solution for this challenge, we explain Linked Data and explain how Linked Data can be used to semantically map data models to each other. By actively harmonizing a collection of datasets that are relevant for the smart grid we prove the viability for using 'linked data' as a solution for interoperability challenges of the smart grid. We did this with the following datasets: - Liander Open Data set - Zonnedeal smart meter readings - Mpare smart meter readings","","en","report","CERISE CG","","","","","","","","Architecture and The Built Environment","OTB Research","","","",""
"uuid:5213b508-e930-4f26-92c9-881521dab387","http://resolver.tudelft.nl/uuid:5213b508-e930-4f26-92c9-881521dab387","Installed base registration of decentralised solar panels with applications in crisis management","Aarsen, R.; Janssen, M.; Ramkisoen, M.; Biljecki, F.; Quak, W.; Verbree, E.","","2015","In case of a calamity in the Netherlands - e.g. a dike breach - parts of the nationwide electric network can fall out. In these occasions it would be useful if decentralised energy sources of the Smart Grid would contribute to balance out the fluctuations of the energy network. Decentralised energy sources include: solar energy, wind energy, combined heat and power, and biogas. In this manner, parts of the built environment - e.g. hospitals - that are in need of a continuous power flow, could be secured of this power. When a calamity happens, information about the Smart Grid is necessary to control the crisis and to ensure a shared view on the energy networks for both the crisis managers and network operators. The current situation of publishing, storing and sharing data of solar energy has been shown a lack of reliability about the current number, physical location, and capacity of installed decentralised photovoltaic (PV) panels in the Netherlands. This study focuses on decentralised solar energy in the form of electricity via PV panels in the Netherlands and addresses this challenge by proposing a new, reliable and up-to-date database. The study reveals the requirements for a registration of the installed base of PV panels in the Netherlands. This new database should serve as a replenishment for the current national voluntary registration, called Production Installation Register of Energy Data Services Netherland (EDSN-PIR), of installed decentralised PV panel installations in the Smart Grid, and provide important information in case of a calamity.","smart grid; crisis management; photovoltaic (PV) panels; registration; linked Data","en","conference paper","ISPRS","","","","","","","","Architecture and The Built Environment","Urbanism","","","",""
"uuid:87a88992-99ce-488f-a3bc-7c29be4e58a7","http://resolver.tudelft.nl/uuid:87a88992-99ce-488f-a3bc-7c29be4e58a7","On achieving network throughput demand in cognitive radio-based home area networks","Sarijari, M.A.B.; Abdullah, M.S.; Janssen, G.J.M.; Van der Veen, A.J.","","2015","The growing number of wireless devices for in-house use is causing a more intense use of the spectrum to satisfy the required quality-of-service such as throughput. This has contributed to spectrum scarcity and interference problems particularly in home area networks (HAN). Cognitive radio (CR) has been recognized as one of the most important technologies which could solve these problems and sustainably meeting the required communication demands by intelligently exploiting temporarily unused spectrum, including licensed spectrum. In this paper, we propose a throughput demand-based cognitive radio solution for home area networks (TD-CRHAN) which aims at effectively and efficiently meet the ever-increasing throughput demand in HAN communication. It is shown numerically and by simulations that a TD-CRHAN can satisfy the requested throughput from the network devices and has high utilization of the available throughput. The analysis further shows that, by setting the achievable throughput to be as close as possible to the total demanded throughput (instead of maximizing it), a TD-CRHAN is able to relax the tight cooperative spectrum sensing requirements which significantly improves cooperative spectrum sensing parameters, such as the local spectrum sensing time and the number of cooperative spectrum sensing devices. Finally, it is shown that these cooperative spectrum sensing parameters can be further improved when additional channels are available.","home area network communication; throughput; cognitive radio; cooperative spectrum sensing; OA-Fund TU Delft","en","journal article","Springer","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics","","","",""
"uuid:c523ea23-e39e-46bb-bedf-d31d80fa19b9","http://resolver.tudelft.nl/uuid:c523ea23-e39e-46bb-bedf-d31d80fa19b9","Electronic Government and Electronic Participation","Tambouris, E.; Scholl, H.J.; Janssen, M.F.W.H.A.; Wimmer, M.A.; Tarabanis, K.; Gascó, M.; Klievink, A.J.; Lindgren, I.; Milano, M.; Panagiotopoulos, P.; Pardo, T.A.; Parycek, P.; Sæbø, O.","","2015","Electronic government and electronic participation continue to transform the public sector and society worldwide and are constantly being transformed themselves by emerging information and communication technologies. This book presents papers from the 14th International Federation for Information Processing’s EGOV conference (IFIP EGOV 2015), and its sister conference, the 7th Electronic Participation (ePart) conference, held in Thessaloniki, Greece, from 30 August to 2 September 2015, with the support and sponsorship of the University of Macedonia. Through the years, both of these conferences have established themselves as leading scientific events in their field, providing a forum for scholars to present and discuss their work. Included here are 31 accepted ongoing research papers, grouped under the following headings: eParticipation; policy modeling; open government and smart cities; general e-government; and e-government services; as well as 6 Ph.D. colloquium papers, 5 accepted posters and 3 workshops. With their combination of scientific credibility and rigor and with high relevance to practice, the papers presented here will be of interest to all those whose work involves electronic government and electronic participation.","","en","book","IOS Press","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:b904597b-56cc-4785-8114-aa01eb856555","http://resolver.tudelft.nl/uuid:b904597b-56cc-4785-8114-aa01eb856555","Exploring factors that influence information sharing choices of organizations in networks","Singerling, T.; Klievink, A.J.; De Reuver, G.A.; Janssen, M.F.W.H.A.","","2015","Organizations do not just decide on whether or not to exchange information digitally. In many cases, there are multiple alternative configurations of inter-organizational systems (IOS) that facilitate such information sharing. Although a lot is known about the factors that influence whether organizations do or do not adopt IOS, little is known about how these factors work when organizations are choosing among multiple configurations for information sharing. This paper takes two archetypical IOS forms - dyadic and multilateral arrangements – and explores how the known antecedents affect choosing among them. To this end, a case study was conducted on the selection and development of an IOS for information sharing in a network of utility service and infrastructure providers.","IOS; configuration; choices; adoption; networks","en","conference paper","","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:6ec0fa3f-60df-4556-81b2-b8781ab37945","http://resolver.tudelft.nl/uuid:6ec0fa3f-60df-4556-81b2-b8781ab37945","Evolving ICT and governance in organizational networks: Conceptual and theoretical foundations","Loukis, E; Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Dawes, S.; Zheng, L","","2016","Both private and public sector organizations tend to participate in networks in order to gain access to knowledge, skills and resources of other organizations and to create synergies to achieve highly demanding and complex goals they cannot attain individually. The governance of these networks has been recognized as being an important variable influencing organizational network performance. This Special Issue aims to contribute to the investigation and understanding of the relationships between ICT and governance of organizational networks. This introductory paper provides the conceptual and theoretical background. The relationship between network governance and technology is bi-directional; evolutions in ICT enable the development of new types of network collaborations and governance, whereas governance of collaboration networks is critical for the development of complex ICT infrastructures. We argue that network governance should be conceptualized as an evolving socio-technical process shaped by actors and aimed at tackling complex and dynamic contemporary challenges.","Organizational networks; Network governance; Governance; Collaboration","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:c4f9b42a-0ef7-46a5-b7a7-7cd5f0a2c6c3","http://resolver.tudelft.nl/uuid:c4f9b42a-0ef7-46a5-b7a7-7cd5f0a2c6c3","Adaptive governance: Towards a stable, accountable and responsive government","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); van der Voort, H.G. (TU Delft Organisation & Governance)","","2016","Organizations are expected to adapt within a short time to deal with changes that might become disruptive if not adequately dealt with. Yet many organizations are unable to adapt effectively or quickly due to the established institutional arrangements and patterns of decision-making and governance. Adaptive governance should enhance the capacity of an organization to deal with and adapt to changes, while protecting the same organization from becoming unstable. Strategies of adaptive governance include utilizing internal and external capabilities, decentralizing decision-making power, and seeking to inform higher-level decisions from bottom-up. At the same time, adaptive strategies may challenge stability and accountability, which remain essential for governments. This means that adaptive governance implies a 'balancing act', and a reliance on ambidextrous strategies. The aim of this editorial is to introduce the concept of adaptive governance and discuss its implications for governments in the digital age.","Adaptability; Adaptive governance; Agile development; Agility; Ambidexterity; E-Government; Governance; Innovation; Institutions; Speed","en","journal article","","","","","","Accepted Author Manuscript","","2018-01-01","","","Information and Communication Technology","","",""
"uuid:54aa8bb3-8d3a-40b9-a386-cce19b0a630d","http://resolver.tudelft.nl/uuid:54aa8bb3-8d3a-40b9-a386-cce19b0a630d","Improving the speed and ease of open data use through metadata, interaction mechanisms and quality indicators","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Susha, I. (TU Delft Information and Communication Technology)","","2016","The use of Open Government Data (OGD) has not kept pace with the expectations as existing OGD infrastructures mainly serve as data repositories. Many OGD infrastructures do not stimulate or support OGD use processes, and there is a lack of research regarding which functionalities can stimulate such processes. The objective of this study is to use a design science approach to evaluate whether metadata, interaction mechanisms, and data quality indicators can improve OGD use. OGD use comprises five main activities, namely searching for and finding OGD, OGD analysis, visualizing OGD, interacting about OGD, and OGD quality analysis. We expect that three OGD key infrastructure elements—metadata, interaction mechanisms, and data quality indicators—allow for improving these five OGD use activities. A prototype of an advanced OGD infrastructure was created, which implements the three OGD infrastructure elements. Three quasi-experiments with a pretest posttest control group design were conducted. The quasi-experiments showed that the prototype facilitated the usability of the novel OGD use functionalities. Our quasi-experiments supported our propositions that metadata, interaction mechanisms, and data quality indicators contribute to making OGD use easier and faster, and enhance the user experience. The infrastructure elements improved OGD use by better enabling searching, analyzing, visualizing, discussing, giving feedback on, and assessing the quality of open data. Hence, we plea for integrating metadata, interaction mechanisms, and data quality indicators in open data infrastructures to advance open data usage.","adoption; design research; e-government; interaction; metadata; open data; open government data; quality; quasi-experiment; social media; usability; use","en","journal article","","","","","","First published online: 02 Dec 2015","","2016-12-02","","","Information and Communication Technology","","",""
"uuid:64349714-935b-4972-9c61-3a1bd0f9b4fa","http://resolver.tudelft.nl/uuid:64349714-935b-4972-9c61-3a1bd0f9b4fa","Big data klaar voor gebruik?: De coördinatie van de dataketen","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); van der Voort, H.G. (TU Delft Organisation & Governance)","","2016","In het proces van creëren, opschonen, verwerken en gebruik van data zijn verschillende partijen betrokken, met verschillende deskundigheid, motieven en belangen. Dit maaktoverdracht van kennis belangrijk, maar ook moeilijk. Bedoelen partijen hetzelfde?Begrijpen partijen hetzelfde? Willen partijen hetzelfde? Om de waarde van data te kunnen bepalen moet het gehele onderliggende proces worden geanalyseerd en begrepen.Een belangrijk deel van dit proces kan buiten de eigen organisatie liggen. De uitdaging voor overheden als gebruikers van big data is de datakwaliteit te managen, om zo de grondslag van hun beslissingen stevig te houden.","","nl","journal article","","","","","","","","2017-02-01","","","Information and Communication Technology","","",""
"uuid:39bf2e4d-601d-42bb-9dd5-64a137918df0","http://resolver.tudelft.nl/uuid:39bf2e4d-601d-42bb-9dd5-64a137918df0","Driving innovation through big open linked data (BOLD): Exploring antecedents using interpretive structural modelling","Dwivedi, Yogesh K. (Swansea University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Slade, Emma L. (Swansea University); Rana, Nripendra P. (Swansea University); Weerakkody, Vishanth (Brunel University); Millard, Jeremy (Brunel University; Danish Technological Institute); Hidders, Jan (Vrije Universiteit Brussel); Snijders, D. (The Dutch Study Center for Technology Trends (STT))","","2016","Innovation is vital to find new solutions to problems, increase quality, and improve profitability. Big open linked data (BOLD) is a fledgling and rapidly evolving field that creates new opportunities for innovation. However, none of the existing literature has yet considered the interrelationships between antecedents of innovation through BOLD. This research contributes to knowledge building through utilising interpretive structural modelling to organise nineteen factors linked to innovation using BOLD identified by experts in the field. The findings show that almost all the variables fall within the linkage cluster, thus having high driving and dependence powers, demonstrating the volatility of the process. It was also found that technical infrastructure, data quality, and external pressure form the fundamental foundations for innovation through BOLD. Deriving a framework to encourage and manage innovation through BOLD offers important theoretical and practical contributions.","Big data; Innovation; Interpretive structural modelling; Linked data; Open data","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:90eef4bb-6104-4f12-ab2e-4a489ad103f1","http://resolver.tudelft.nl/uuid:90eef4bb-6104-4f12-ab2e-4a489ad103f1","Wees voorbereid op het onverwachte: Adaptief vermogen is in disruptieve economie de sleutel tot succes","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2016","Digitale ontwikkelingen overrompelen. Organisaties ondernemen vaak pas actie als het water hun aan de lippen staat. Dan is het niet zelden al te laat. Of ze springen onvoorbereid op de rijdende trein, zonder te weten waar het heen gaat. Om te overleven is een digital vision noodzakelijk. De crux: wees voorbereid op het onverwachte. Of zoals managers veel zeggen: expect the unexpected.","","en","other","IT executive","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9116ca91-7b99-49a8-ba77-0ffeb751fdc5","http://resolver.tudelft.nl/uuid:9116ca91-7b99-49a8-ba77-0ffeb751fdc5","Special Issue on Smart Cities in Practice: Value Sources, Applications and Functionalities: Guest Editorial Preface","Anthopoulos, Leonidas; Weerakkody, Vishanth; Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2016","","","en","contribution to periodical","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:48766282-abde-421e-8b16-a0f76e14a3b0","http://resolver.tudelft.nl/uuid:48766282-abde-421e-8b16-a0f76e14a3b0","The wicked problem of commercial value creation in open data ecosystems: Policy guidelines for governments","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); van de Kaa, G. (TU Delft Economics of Technology and Innovation); Poulis, K.","","2016","Creating commercial value through open data use in open data ecosystems is a wicked problem. This problem is characterized by a lack of specific formulation, complex interactions amongst a variety of stakeholders, a lack of criteria determining a satisfactory solution, including what constitutes `value', and uncertain outcomes. Wicked problems cannot be solved by only considering part of the problem. Yet, open data efforts all too often focus mainly on open data publication and neglect the use of the data; while it is the use of data (not just publication) that generates value. This paper addresses the question: Which policy guidelines can support commercial value creation from open data? This study first elicits characteristics of wicked problems for studying the wicked problem of commercial open data value creation. Subsequently, we use the wicked problem characteristics to study open data innovation in two countries and consult experts. This work results in eliciting four policy guidelines that can help to derive greater commercial value from open data ecosystems. The four policy guidelines show that governmental open data policies for commercial value should pay attention to: 1) increasing the knowledge of open data ecosystem stakeholders about contextual factors influencing open data use and commercial value creation, 2) ensuring the availability and quality of five types of resources: open data, open Information Technology (IT), internal IT, knowledge and governance, 3) cooperating between businesses and citizens to create alliances, and 4) reducing the negative effects of value creation by companies in the open data ecosystem. These policy guidelines are expected to stimulate commercial value creation with open data use.","Open data; commercial; companies; value creation; wicked problem; ecosystem","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2017-04-24","","","Information and Communication Technology","","",""
"uuid:ff6b86e0-4353-4d46-956d-fa32f36a1c5e","http://resolver.tudelft.nl/uuid:ff6b86e0-4353-4d46-956d-fa32f36a1c5e","Controlling adhesion between multi-asperity contacting surfaces in MEMS devices by local heating","Gkouzou, A. (TU Delft Micro and Nano Engineering); Kokorian, J. (TU Delft Micro and Nano Engineering); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering); van Spengen, W.M. (TU Delft Micro and Nano Engineering; Falco Systems)","","2016","In this work, we have incorporated heaters in a MEMS device, which allow the in situ local heating of its contacting surfaces. This design offers a promising solution for MEMS devices with contacting components by preventing capillary-induced adhesion. The force of adhesion was assessed by optically measuring in-plane snap-off displacements. We were able to decrease adhesion from 500 nN to 200 nN with just one heated surface of which the temperature was set above 300 °C. The temperature should not be set too high: we observed increased adhesion due to a direct bonding process once the temperature was increased above 750 °C. Remarkably, adhesion increased by heating from room temperature to 75 °C, which is attributed to more water being transferred to the contact area due to faster kinetics. We observed the same effect in the cases where both surfaces were heated, although at slightly different temperatures. We demonstrated that heating only one surface to between 300 °C and 750 °C is sufficient to significantly lower adhesion, due to the removal of capillary menisci. The required heater is typically most easily implemented in a stationary part of the device.","MEMS device; adhesion; stiction; displacement; temperature; micro-Raman spectroscopy; capillary condensation","en","journal article","","","","","","","","","","","Micro and Nano Engineering","","",""
"uuid:f068e556-fa35-49ad-897b-4d2d90e236b5","http://resolver.tudelft.nl/uuid:f068e556-fa35-49ad-897b-4d2d90e236b5","Towards an ambidextrous government: Strategies for balancing exploration and exploitation in open government","Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2016","Governments are often putting their efforts in the operation and execution of existing services without having the means to innovate. Ambidexterity is the ability to operate existing services and to innovate at the same time Ambidexterity is a concept originating from organizational studies in the private sector and is hardly used in the public sector. The goal of this paper is to identify strategies used by governments to combine exploitation and exploration. Factors influencing ambidexterity were derived from the literature and categorized in political, organizational, technological and economical categories. These factors were used to analyze two case studies. The cases revealed strategies used by government to move from exploitation to exploration. Strategies include providing incentives, like awards and prizes, to involve resources that are external to the government. The strategies can be classified as contextual ambidexterity.","E-Government; public sector; Transparency; Open data; Open government; Accountability; Innovation; Ambidexterity; Exploration; Exploitation","en","conference paper","ACM/IEEE","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9738ace3-8c75-4df9-a1dd-b41ce643c382","http://resolver.tudelft.nl/uuid:9738ace3-8c75-4df9-a1dd-b41ce643c382","OpenGovIntelligence Project Deliverable D4.1- Pilots and Evaluation Plan V1: Fostering Innovation and Creativity in Europe through Public Administration Modernization towards Supplying and Exploiting Linked Open Statistical Data","Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Praditya, D. (TU Delft Information and Communication Technology)","","2016","In this report evaluation methods and measures for the OpenGovIntelligence (OGI) project are presented. The evaluation of OGI innovation ecosystem on public administration is based on four main areas that will be evaluated: 1. Co-Creation Framework. How will this framework enable co-creation? 2. OGI ICT Toolkit (Building blocks and Cubes Design). Are the building blocks suitable for providing the functionality needed? How does the OGI ICT toolkit serve its purpose support application development? 3. Acceptance of OGI Toolkit. Will the users accept and work with the developed applications? 4. Outcomes: what is the result of these use of the applications on elements like administrative burden and transparency?","Evaluation; Adoption; public value; survey; Measures; linked open statistical data; Open Data","en","report","European Union","","","","","","","","","","Information and Communication Technology","","",""
"uuid:29dac36d-43d1-4b18-960c-32aa764b35e0","http://resolver.tudelft.nl/uuid:29dac36d-43d1-4b18-960c-32aa764b35e0","OpenGovIntelligence Project Deliverable D5.1- Dissemination and Exploitation Plan V1","Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Moynihan, Rick","","2016","This deliverable describes the planned dissemination and exploitation activities to promote the project outcomes within the project's target groups and stakeholders. The activities plan is also assigned giving the partners responsibilities.","Dissemination; Exploitation; Awareness; events; publications","en","report","European Union","","","","","","","","","","Information and Communication Technology","","",""
"uuid:664a145d-c59f-431f-9abf-5719a8358f85","http://resolver.tudelft.nl/uuid:664a145d-c59f-431f-9abf-5719a8358f85","Eye-based driver state monitor of distraction, drowsiness, and cognitive load for transitions of control in automated driving","Cabrall, C.D.D. (TU Delft OLD Intelligent Vehicles & Cognitive Robotics); Janssen, Nico; Goncalves, Joel (Technische Universität München); Morando, Alberto (Chalmers University of Technology); Sassman, Matthew (Institut Francais des Sciences et Technologies des Transports (IFSTTAR)); de Winter, J.C.F. (TU Delft OLD Intelligent Vehicles & Cognitive Robotics)","","2016","Automated driving vehicles of the future will most likely include multiple modes and levels of operation and thus include various transitions of control (ToC) between human and machine. Traditional activation devices (e.g., knobs, switches, buttons, and touchscreens) may be confused by operators among other system setting manipulators and also susceptible to inappropriate usage. Non-intrusive eye-tracking measures may assess driver states (i.e., distraction, drowsiness, and cognitive overload) automatically to trigger manual-to-automation ToC and serve as a driver readiness verification during automation-to-manual ToC. Our integrated driver state monitor is overviewed here within the scope of this brief system description/demonstration paper. It combines gaze position, gaze variability, eyelid opening, as well as external environmental complexity from the driving scene to facilitate ToC in automated driving. As both driver facing and forward facing cameras become increasingly commonplace and even legally mandated within various automated driving vehicles, our integrated system helps inform relevant future research and development towards improved human-computer interaction and driving safety.","Vehicles; Automation; Monitoring; Safety; Roads; Bars; Time measurement","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2017-08-09","","","OLD Intelligent Vehicles & Cognitive Robotics","","",""
"uuid:e96f5992-cc16-44ec-a3db-d1b6cbd669d8","http://resolver.tudelft.nl/uuid:e96f5992-cc16-44ec-a3db-d1b6cbd669d8","Ten-year outcomes of a randomised trial of laparoscopic versus open surgery for colon cancer","Deijen, Charlotte L. (Amsterdam UMC); Vasmel, Jeanine E. (Amsterdam UMC); de Lange-de Klerk, Elly S M (Amsterdam UMC); Cuesta, Miguel A. (Amsterdam UMC); Coene, Peter Paul L O (Maasstad Hospital); Lange, Johan F. (Erasmus MC); Meijerink, W. J H Jeroen (Amsterdam UMC); Jakimowicz, J.J. (TU Delft Applied Ergonomics and Design); Jeekel, Johannes (Erasmus MC); Kazemier, Geert (Amsterdam UMC); Janssen, Ignace M C (Rijnstate Hospital); Påhlman, Lars (Uppsala University Hospital); Haglind, Eva (Sahlgrenska University Hospital/Östra); Bonjer, H. Jaap (Amsterdam UMC)","","2016","Background: Laparoscopic surgery for colon cancer is associated with improved recovery and similar cancer outcomes at 3 and 5 years in comparison with open surgery. However, long-term survival rates have rarely been reported. Here, we present survival and recurrence rates of the Dutch patients included in the COlon cancer Laparoscopic or Open Resection (COLOR) trial at 10-year follow-up. Methods: Between March 1997 and March 2003, patients with non-metastatic colon cancer were recruited by 29 hospitals in eight countries and randomised to either laparoscopic or open surgery. Main inclusion criterion for the COLOR trial was solitary adenocarcinoma of the left or right colon. The primary outcome was disease-free survival at 3 years, and secondary outcomes included overall survival and recurrence. The 10-year follow-up data of all Dutch patients were collected. Analysis was by intention-to-treat. The trial was registered at ClinicalTrials.gov (NCT00387842). Results: In total, 1248 patients were randomised, of which 329 were Dutch. Fifty-eight Dutch patients were excluded and 15 were lost to follow-up, leaving 256 patients for 10-year analysis. Median follow-up was 112 months. Disease-free survival rates were 45.2 % in the laparoscopic group and 43.2 % in the open group (difference 2.0 %; 95 % confidence interval (CI) −10.3 to 14.3; p = 0.96). Overall survival rates were 48.4 and 46.7 %, respectively (difference 1.7 %; 95 % CI −10.6 to 14.0; p = 0.83). Stage-specific analysis revealed similar survival rates for both groups. Sixty-two patients were diagnosed with recurrent disease, accounting for 29.4 % in the laparoscopic group and 28.2 % in the open group (difference 1.2 %; 95 % CI −11.1 to 13.5; p = 0.73). Seven patients had port- or wound-site recurrences (laparoscopic n = 3 vs. open n = 4). Conclusions: Laparoscopic surgery for non-metastatic colon cancer is associated with similar rates of disease-free survival, overall survival and recurrences as open surgery at 10-year follow-up.","Colon cancer; Laparoscopic; Randomised clinical trial; Surgery; Treatment","en","journal article","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:9da1d765-612c-492f-beb4-4bfa63944e8e","http://resolver.tudelft.nl/uuid:9da1d765-612c-492f-beb4-4bfa63944e8e","Research agenda: human behaviour and liveability, accessibility and safety","Band, G.; Holewijn, M.; Janssen, C.; Kenemans, L.; Lorist, M.; Steg, L; van Wee, G.P. (TU Delft Transport and Logistics)","","2016","This research agenda is an initiative of the NWO National Initiative Brain and
Cognition (NIHC) with involvement of the Behavioural Insight Team of the
Dutch Ministry of Infrastructure and the Environment (IenM).","","en","other","NWO","","","","","","","","","","Transport and Logistics","","",""
"uuid:3211615b-bc80-4efb-968b-921b03103474","http://resolver.tudelft.nl/uuid:3211615b-bc80-4efb-968b-921b03103474","Governing Asset Management Data Infrastructures","Brous, P.A. (TU Delft Information and Communication Technology); Herder, P.M. (TU Delft Energie and Industrie); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2016","Organizations are increasingly looking to trusted data to drive their decision making process. Trusted data has a clear, defined and consistent quality which meets the expectations of the user. Data infrastructures which produce trusted data and provide organizations with the capability to make the right decisions at the right time are socio-technical networks, consisting of technical infrastructures and actor networks, and as such they are often complex and adaptive. Critical issues, challenges, and dilemmas can be identified while looking at data infrastructures as a socio-technical systems. This paper explores conditions and factors for effective and sustainable development of data infrastructures in organizations and suggests that the inherent complexity of data infrastructures requires a multi-faceted way of data governance. Several predefined components of data infrastructures which contain the behavior of agents through various coordination mechanisms have been developed to model the effect of data governance on data infrastructures. These components can be further customized to model an empirical situation more closely. Finally, the paper suggests institutionalization of data governance within an organization as a unifying concept towards the effectiveness and sustainability of data infrastructures, recognizing their inherent complexities. The approach is illustrated with a case study in the asset management domain.","complex adaptive systems; CAS; data infrastructure; asset management; data quality; data governance","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:1120bb57-f924-40f7-acc1-7c28c48bdd96","http://resolver.tudelft.nl/uuid:1120bb57-f924-40f7-acc1-7c28c48bdd96","Smart Service Portfolios: Do the Cities Follow Standards?","Anthopoulos, Leonidas; Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth","","2016","Smart services concern the core element of a smart city, since they support the realization of urban ""intelligence"" in terms of people, economy, governance, environment, mobility and leaving. Smart services aim to enhance quality of life within a city and in this respect to improve ""livability"". The types and purposes of smart services cannot be easily pre-defined, since they are the outcome of innovation, which cannot be pre-defined either, but instead it is the product of citizens' and businesses' creativity. However, standard bodies that work on smart city definition have described smart city portfolios, which are suggested to city policy makers and potential entrepreneurs. The aim of this paper is to validate whether standardized smart service portfolios are being followed by smart cities in practice. In this regard, a set of more than 70 smart cities are examined and their smart services are matched to these portfolios. The outcomes are extremely important and leave space for future research in this regard.","Smart city; smart services; standardization; information cities","en","conference paper","International World Wide Web Conferences Steering Committee","","","","","","","","","","Information and Communication Technology","","",""
"uuid:51537a2c-06c6-4162-a413-3f32c89d440a","http://resolver.tudelft.nl/uuid:51537a2c-06c6-4162-a413-3f32c89d440a","Open and Big Data Partnerships for Public Good: Interactive Live Polling of Influential Factors","Susha, I; Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Grönlund, A; Tambouris, E","","2016","There is much potential for open and big data to be used for addressing societal challenges of today. This drives a new kind of partnership called “data collaborative” emphasizing the value of data for public good. Data collaboratives stand for cross-sector partnerships, whereby organizations in the private or public sector disclose their data, as an act of good will, in order to contribute to a societal cause (such as e.g. healthcare, humanitarian, or other policy issues). In this workshop we focus on this emerging topic which so far has deserved little attention in research. In our previous research an initial framework of influential factors for data collaboratives was introduced. The workshop objective is to validate and refine this initial framework by inviting participants to take part in an interactive live polling exercise and assess a number of propositions about influential factors.","big data; open data; collaboration; ppublic private partnership","en","conference paper","IOS Press","","","","","","","","","","Information and Communication Technology","","",""
"uuid:a083393c-aa60-4834-8091-3503282c8826","http://resolver.tudelft.nl/uuid:a083393c-aa60-4834-8091-3503282c8826","Open Statistical Data: Potential and Challenges","Tambouris, E; Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Kalampokis, E.; Roberts, B; Hermans, P.; Alcorn, T.; Tarabanis, K","","2016","Opening up data is a political priority worldwide. Linked open data is considered as the most mature technology for publishing and reusing open data. A large number of open data is numerical and actually concerns statistics. In the literature, statistical data have been heavily studied using the data cube model. Recently, ICT tools have emerged aiming to exploit linked open data technologies for providing advanced visualizations and analytics of open statistical data residing in geographically dispersed open data portals. The aim of this panel is to discuss the potential and challenges of open statistical data.","Open Data; Open Statistical Data","en","conference paper","IOS Press","","","","","","","","","","Information and Communication Technology","","",""
"uuid:7fca8c80-7009-46ea-9cce-ff9b0490a064","http://resolver.tudelft.nl/uuid:7fca8c80-7009-46ea-9cce-ff9b0490a064","Long-term biogeomorphological behavior of coupled bare intertidal flats and vegetated foreshores","Willemsen, P.W.J.M (University of Twente); Borsje, B.W. (University of Twente; Deltares); Vuik, V. (HKV Consultants); Janssen, S.K.H. (TU Delft Policy Analysis; Deltares); Bouma, T. J. (NIOZ Royal Netherlands Institute for Sea Research); Hulscher, SJMH (University of Twente)","","2016","","","en","abstract","","","","","","","","","","","Policy Analysis","","",""
"uuid:bf4ef304-5dca-4c8d-997c-0a38b2187653","http://resolver.tudelft.nl/uuid:bf4ef304-5dca-4c8d-997c-0a38b2187653","Design of a Business-to-Government Information Sharing Architecture Using Business Rules","Van Engelenburg, S.H.; Janssen, M.F.W.H.A.; Klievink, A.J.","","2016","Information sharing between businesses and government agencies is of vital importance, yet business are often reluctant to share information, e.g. as it might be misused. Taking this into account is however often overlooked in the design of software architectures. In this research we apply a design science approach to develop an software architecture that is acceptable by businesses. From a case study we derive the requirements an architecture should meet in order to contribute to increasing willingness to share information. In this paper the architecture is developed and evaluated according to the requirements. We recommend the use of different types of business rules that provide businesses with control over their data, in combination with encryption and decryption of data to provide access to parts of the data within an organization.","software-architecture; information sharing; business rules; encryption; decryption; supply chain; customs","en","book chapter","Springer","","","","","","","","Technology, Policy and Management","Engineering Systems and Services","","","",""
"uuid:cb5f60bb-ff62-4296-a62d-b60784fd2ff4","http://resolver.tudelft.nl/uuid:cb5f60bb-ff62-4296-a62d-b60784fd2ff4","Big and Open Linked Data (BOLD) in Research, Policy and Practice","Janssen, M.F.W.H.A.; Kuk, G.","","2016","The value of data as a new economic asset class is seldom realized on its own. With less reliance on self-administered survey, it offers new insights into behaviors and patterns. Yet it is a huge undertaking of bringing together multiple actors from different disciplines and diverse practices to examine the underexplored relationships between types of data. There are different inquiry systems and research cycles to make sense out of big and open data (BOLD). We argue that deploying theories from diverse disciplines and considering using different inquiry systems and research cycles offers a more disciplined and robust methodological approach. This allows us to break through the limits of backward induction from the evidence by moving back and forward in exploring the unknown through BOLD. As such, we call for developing a variety of rigorous approaches to counterbalance the current practice in theory-free approach in the analysis and use of BOLD.","big data; open data; BOLD; policy-making; e-government","en","journal article","Taylor & Francis","","","","","","","2017-03-29","Technology, Policy and Management","Engineering, Systems and Services","","","",""
"uuid:7467df11-a051-4393-ab61-0d5c1ea8ca97","http://resolver.tudelft.nl/uuid:7467df11-a051-4393-ab61-0d5c1ea8ca97","Combined Corrosion and Wear of Aluminium Alloy 7075-T6","Liu, Y.; Mol, J.M.C.; Janssen, G.C.A.M.","","2016","The aluminium alloy 7075-T6 is widely used in engineering. In some applications, like slurry transport, corrosion and abrasion occur simultaneously, resulting in early material failure. In the present work, we investigated the combined effect of corrosion and wear on the aluminium alloy 7075-T6. We performed two series of wear experiments to vary the conditions and severity of corrosion environment: chemically by using ethanol, deionized water and seawater, and electrochemically by applying various potentials using a potentiostat in seawater. Results show that, in seawater, the wear rate was higher than in deionized and ethanol; and in the potentiostat experiments, at the anodic potentials, the wear rates were higher than at the open circuit potential and the cathodic potentials. Seawater is the most corrosive one among the three liquids and the corrosion products can be easily removed. When applying anodic potentials, corrosion is accelerated, and the higher wear rate confirms that higher corrosion rate leads to higher wear rate due to the formation and removal of corrosion products during tribocorrosion.","aluminium alloy; electrochemistry; wear; corrosion","en","journal article","Springer","","","","","","","","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:d06e2be5-3274-44d1-8aa3-c05ae1253ee6","http://resolver.tudelft.nl/uuid:d06e2be5-3274-44d1-8aa3-c05ae1253ee6","A practical clock synchronization algorithm for UWB positioning systems","Xie, Y. (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); van der Veen, A.J. (TU Delft Signal Processing Systems)","Dong, Min (editor); Zheng, Thomas Fang (editor)","2016","A clock synchronization scheme is crucial for obtaining accuracy in time-based positioning systems. Existing clock synchronization schemes are mostly based on a simplified linear clock model, which unfortunately have a poor long-term synchronization accuracy. Assuming a two-way time transfer protocol, we propose a novel clock synchronization algorithm based on a precise physical clock model to realize joint clock synchronization and propagation delay estimation. The Cramer-Rao lower bound (CRLB) is derived for this clock model and shows that the estimation is asymptotically efficient and converges to the lower bound. For long time spans, this model performs better than a linear clock model.","clock synchronization; Clock drift; ultra-wide band; two way time transfer","en","conference paper","IEEE","","","","","","","","","","Signal Processing Systems","","",""
"uuid:fa47a0c6-ddd0-42f3-9747-53b6552d039c","http://resolver.tudelft.nl/uuid:fa47a0c6-ddd0-42f3-9747-53b6552d039c","Inhibition of a biological sulfide oxidation under haloalkaline conditions by thiols and diorgano polysulfanes","Roman, Pawel (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research); Lipińska, Joanna (Warsaw University of Technology; Wetsus, Centre for Sustainable Water Technology); Bijmans, Martijn F M (Wetsus, Centre for Sustainable Water Technology); Sorokin, Dimitry Y. (TU Delft BT/Environmental Biotechnology; Russian Academy of Sciences); Keesman, Karel J. (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research); Janssen, Albert J H (Shell Global Solutions International B.V.; Wageningen University & Research)","","2016","A novel approach has been developed for the simultaneous description of reaction kinetics to describe the formation of polysulfide and sulfate anions from the biological oxidation of hydrogen sulfide (H2S) using a quick, sulfide-dependent respiration test. Next to H2S, thiols are commonly present in sour gas streams. We investigated the inhibition mode and the corresponding inhibition constants of six thiols and the corresponding diorgano polysulfanes on the biological oxidation of H2S. A linear relationship was found between the calculated IC50 values and the lipophilicity of the inhibitors. Moreover, a mathematical model was proposed to estimate the biomass activity in the absence and presence of sulfurous inhibitors. The biomass used in the respiration tests originated from a full-scale biodesulfurization reactor. A microbial community analysis of this biomass revealed that two groups of microorganism are abundant, viz. Ectothiorhodospiraceae and Piscirickettsiaceae.","Diorgano polysulfanes; Kinetic constants; Respirometry; Sulfide oxidizing bacteria; Thioalkalivibrio; Thiols","en","journal article","","","","","","Accepted Author Manuscript","","2017-12-04","","","BT/Environmental Biotechnology","","",""
"uuid:3c810cc3-bac6-46af-b882-d7595a45595c","http://resolver.tudelft.nl/uuid:3c810cc3-bac6-46af-b882-d7595a45595c","High-Performance Motion Control of the METIS Cold Chopper Mechanism","Huisman, Robert (SRON Netherlands Institute for Space Research); Paalvast, Sander (Janssen Precision Engineering); Brandl, B.R. (TU Delft Astrodynamics & Space Missions; Universiteit Leiden); Van Den Dool, Teun (TNO); Eggens, Martin (SRON Netherlands Institute for Space Research); Janssen, Huub (Janssen Precision Engineering); Aitink-Kroes, Gabby (NOVA); Molster, Frank (NOVA); Teuwen, Maurice (Janssen Precision Engineering); Venema, Lars (Netherlands Institute for Radio Astronomy (ASTRON)); Jayawardhana, Bayu (University Medical Center Groningen)","","2016","We present the main results of the performance test campaign of the Mid-Infrared European Extremely Large Telescope Imager and Spectrograph (METIS) Cold Chopper Demonstrator (MCCD). This tip/tilt mirror, which operates at a temperature of 77 K, is one of the critical components in the METIS for the European Extremely Large Telescope. The performance requirements of the MCCD relate to the field of fast and very accurate reference tracking. We discuss the applicability of different high-performance motion control strategies and describe the control synthesis of a repetitive and of a novel hybrid controller. We identified the presence of nonlinearities in the plant, which limits the performance of the hybrid controller. The repetitive controller shows very promising results and can handle the nonlinearities in the system. This experimental phase concludes the MCCD program, which was initiated to verify the feasibility of a high-performance cryogenic tip/tilt mirror at an early stage in the METIS development. Because of the very promising test results, no significant changes to the hardware will be implemented. We believe that minor adjustments will suffice to meet all requirements of the final hardware after integration with the METIS instrument.","Control synthesis; high-performance motion control; hybrid control; hysteresis; repetitive control; tip/tilt mechanism","en","journal article","","","","","","","","","","","Astrodynamics & Space Missions","","",""
"uuid:4bb23f96-8d8d-406a-9744-ec9c7f8d2530","http://resolver.tudelft.nl/uuid:4bb23f96-8d8d-406a-9744-ec9c7f8d2530","Business model stress testing: A practical approach to test the robustness of a business model","Haaker, T.I. (TU Delft Information and Communication Technology; Innovator BV); Bouwman, W.A.G.A. (TU Delft Information and Communication Technology; Åbo Akademi University); Janssen, W (Innovator BV); de Reuver, Mark (TU Delft Information and Communication Technology)","","2017","Business models and business model innovation are increasingly gaining attention in practice as well as in academic literature. However, the robustness of business models (BM) is seldom tested vis-à-vis the fast and unpredictable changes in digital technologies, regulation and markets. The evaluation of the robustness of a BM raises several issues, such as how to describe the business model in a structured way, how to determine a relevant set of changes to test against, how to assess their impact on business model components, and how to use the results of the assessment to strengthen the business model. In this paper, we propose business model stress testing as a practical approach to evaluate the robustness of business model components. The method builds upon concepts from business model innovation and scenario planning. We illustrate our approach using a case example. Our approach enables testing individual business model components as well as the interrelation between components. The approach visualizes challenges and suggests ways to increase the robustness of BM. The stress testing approach is particularly useful in a stage of business model experimentation, i.e. if a company has to choose between alternative business models or still has to implement the business model. The underlying software tool is openly available for reuse and further development. The paper contributes to futures research literature by delivering the first method that allows to test the robustness of business models against future uncertainties","Business models; Business model innovation; Scenario analysis; Business model evaluation; Scenario planning","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:42447a76-081d-4731-a9ab-f0dc40735788","http://resolver.tudelft.nl/uuid:42447a76-081d-4731-a9ab-f0dc40735788","Driving public sector innovation using big and open linked data (BOLD)","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Konopnicki, David; Snowdon, Jane L.; Ojo, Adegboyega (National University of Ireland Galway)","","2017","","","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:882d36b4-41e9-4205-a976-be84a5576a45","http://resolver.tudelft.nl/uuid:882d36b4-41e9-4205-a976-be84a5576a45","Building Cybersecurity Awareness: The need for evidence-based framing strategies","de Bruijn, J.A. (TU Delft Multi Actor Systems); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2017","Cybersecurity is a global phenomenon representing a complex socio-technical challenge for governments, but requiring the involvement of individuals. Although cybersecurity is one of the most important challenges faced by governments today, the visibility and public awareness remains limited. Almost everybody has heard of cybersecurity, however, the urgency and behaviour of persons do not reflect high level of awareness. The Internet is all too often considered as a safe environment for sharing information, transactions and controlling the physical world. Yet, cyberwars are already ongoing, and there is an urgent need to be better prepared. The inability to frame cybersecurity has resulted in a failure to develop suitable policies. In this paper, we discuss the challenges in framing policy on cybersecurity and offer strategies for better communicating cybersecurity. Communicating cybersecurity is confronted with paradoxes, which has resulted in society not taking appropriate measures to deal with the threats. The limited visibility, socio-technological complexity, ambiguous impact and the contested nature of fighting cybersecurity complicates policy-making. Framing using utopian or dystopian views might be counterproductive and result in neglecting evidence. Instead, we present evidence-based framing strategies which can help to increase societal and political awareness of cybersecurity and put the issues in perspective.","communication; cyber war; cyberphysical society; cyberphysical system; cybersecurity; evidence-based policymaking; framing; information security; Internet of Things","en","journal article","","","","","","","","","","Multi Actor Systems","Information and Communication Technology","","",""
"uuid:0a0591c8-3351-4df1-b742-942b567ac78a","http://resolver.tudelft.nl/uuid:0a0591c8-3351-4df1-b742-942b567ac78a","Data collaboratives as “bazaars”?: A review of coordination problems and mechanisms to match demand for data with supply","Susha, Iryna (Orebro University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Verhulst, Stefaan (New York University)","","2017","Purpose: In “data collaboratives”, private and public organizations coordinate their activities to leverage data to address a societal challenge. This paper aims to focus on analyzing challenges and coordination mechanisms of data collaboratives. Design/methodology/approach: This study uses coordination theory to identify and discuss the coordination problems and coordination mechanisms associated with data collaboratives. The authors also use a taxonomy of data collaborative forms from a previous empirical study to discuss how different forms of data collaboratives may require different coordination mechanisms. Findings: The study analyzed data collaboratives from the perspective of organizational and task levels. At the organizational level, the authors argue that data collaboratives present an example of the bazaar form of coordination. At the task level, the authors identified five coordination problems and discussed potential coordination mechanisms to address them, such as coordination by negotiation, by third party, by standardization, to name a few. Research limitations/implications: This study is one of the first few to systematically analyze the phenomenon of “data collaboratives”. Practical implications: This study can help practitioners better understand the coordination challenges they may face when initiating a data collaborative and to develop successful data collaboratives by using coordination mechanisms to mitigate these challenges. Originality/value: Data collaboratives are a novel form of data-driven initiatives which have seen rapid experimentation lately. This study draws attention to this concept in the academic literature and highlights some of the complexities of organizing data collaboratives in practice.","Big data; Coordination theory; Data collaborative; Data for good; Data philanthropy; Open data","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:550f0ecf-20e7-447e-a28c-5d4a349d6611","http://resolver.tudelft.nl/uuid:550f0ecf-20e7-447e-a28c-5d4a349d6611","Transparency-by-design as a foundation for open government","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Matheus, R. (TU Delft Information and Communication Technology); Longo, Justin; Weerakkody, Vishanth (Brunel University)","","2017","Purpose: Many governments are working toward a vision of government-wide transformation that strives to achieve an open, transparent and accountable government while providing responsive services. The purpose of this paper is to clarify the concept of transparency-by-design to advance open government. Design/methodology/approach: The opening of data, the deployment of tools and instruments to engage the public, collaboration among public organizations and between governments and the public are important drivers for open government. The authors review transparency-by-design concepts. Findings: To successfully achieve open government, fundamental changes in practice and new research on governments as open systems are needed. In particular, the creation of “transparency-by-design” is a key aspect in which transparency is a key system development requirement, and the systems ensure that data are disclosed to the public for creating transparency. Research limitations/implications: Although transparency-by-design is an intuitive concept, more research is needed in what constitutes information and communication technology-mediated transparency and how it can be realized. Practical implications: Governments should embrace transparency-by-design to open more data sets and come closer to achieving open government. Originality/value: Transparency-by-design is a new concept that has not given any attention yet in the literature.","Data; Democracy; e-government; Open data; Open government; Transparency","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:2b34c1a6-afb0-4894-ac07-0d6b93bfc33b","http://resolver.tudelft.nl/uuid:2b34c1a6-afb0-4894-ac07-0d6b93bfc33b","Design of a software architecture supporting business-to-government information sharing to improve public safety and security: Combining business rules, Events and blockchain technology","van Engelenburg, S.H. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Klievink, A.J. (TU Delft Organisation & Governance)","","2017","Toensurepublicsafetyandsecurity,itisvitallyimportantforgovernmentstocol- lect information from businesses and analyse it. Such information can be used to determine whether transported goods might be suspicious and therefore require physical inspection. Although businesses are obliged to report some information, they are reluctant to share addi- tional information for fear of sharing competitively sensitive information, becoming liable and not being compliant with the law. These reasons are often overlooked in the design of software architectures for information sharing. In the present research, we followed a design science approach to develop a software architecture for business-to-government information sharing. Based on literature and a case study, we elicited the requirements an architecture that provides for the sharing of information should meet to make it acceptable to businesses. We then developed the architecture and evaluated it against the requirements. The architec- ture consists of a blockchain that stores events and rules for information sharing that are controlled by businesses. For each event, two parties use their private keys to encrypt its Merkle root to confirm that they know the data are correct. This makes it easy to check whether information is reliable and whether an event should be accepted. Access control, metadata and context information enable the context-based sharing of information. This is combined with the encryption and decryption of data to provide access to certain data within an organisation.","Software architecture; Blockchain; Information sharing; Safety; Security; Willingness; Business rules; Access control; Encryption; Supply chain; Customs; ICT architecture","en","journal article","","","","","","","","","","","Organisation & Governance","","",""
"uuid:04374407-826b-4850-8e02-6fafef45a5be","http://resolver.tudelft.nl/uuid:04374407-826b-4850-8e02-6fafef45a5be","Towards an Open Government Data Success Model: A case study from Indonesia","Purwanto, A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology)","Borge, Vieira (editor); Rouco, José (editor)","2017","Governments around the world are following the global open government movement by initiating Open Government Data (OGD) programs. They are motivated by the claim that it will generate economic and social value. However, the success of an OGD initiative will only be realized when OGD is used and when the use results in the creation of public value. Even though a plethora of academic research has examined various aspects of OGD initiatives, the question regarding how OGD generates public value remains unaddressed. This paper aims to develop an OGD success evaluation model that offers a systematic way of understanding how OGD creates public value. For this purpose, we first present and explore public value generation through an OGD initiative in the context of Indonesia’s 2014 presidential election. Subsequently, we propose an OGD success evaluation model that explicates how service, information and system quality affect the intention to use OGD and user satisfaction, which in turn lead to the creation of public values. This paper contributes to the literature by applying the Information Systems Success Model of DeLone and McLean in the context of OGD. It extends their model by adding the concepts of social media quality. Since the model is conceptual, further empirical research is needed to test the model.","open government data; e-government; public values; information systems success; evaluation; case study","en","conference paper","Academic Conferences","","","","","","","","","","Information and Communication Technology","","",""
"uuid:a61303ef-d61a-4829-b4c7-4a48f7387b62","http://resolver.tudelft.nl/uuid:a61303ef-d61a-4829-b4c7-4a48f7387b62","Methods & tools for publishing & reusing linked open statistical data","Tambouris, Efthimios (University of Macedonia); Kalampokis, Evangelos (University of Macedonia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Krimmer, Robert (Tallinn University of Technology); Tarabanis, Konstantinos (University of Macedonia)","","2017","The number of open data available for reuse is rapidly increasing. A large number of these data are numerical thus can be easily visualized. Linked open data technology enables easy reuse and linking of data residing in di.erent locations. In this workshop, we will present a number of technologies and tools that are currently under development for visualizing linked open statistical data. We will demonstrate the use of these technologies and tools to visualize open data obtained from various European Union Member States ministries and other organizations. We will also give the workshop participants the opportunity to use these tools thus obtaining a personal experience on their capabilities.","Ict tools; Linked open data; Linked open statistics","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:540a64af-dc7d-45d6-9ec0-6d1864c74b5c","http://resolver.tudelft.nl/uuid:540a64af-dc7d-45d6-9ec0-6d1864c74b5c","Trustworthiness of digital government services: deriving a comprehensive theory through interpretive structural modelling","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Rana, Nripendra P. (Swansea University); Slade, Emma L. (Swansea University); Dwivedi, Yogesh K. (Swansea University)","","2017","Having its origin in public administration, trustworthiness is a significant concept in digital government research, influencing the relationships between citizens and governments. However, the interrelationships between the facets of trustworthiness are given inadequate attention. Therefore, the aim of this research was to develop a theory detailing the factors affecting citizens’ perceptions of e-government trustworthiness. A comprehensive review of public administration and information systems literature highlighted 20 pertinent variables. The interrelationships of these variables were identified and categorized according to their driving and dependence power by employing interpretive structural modelling. The proposed model was then drawn based on the level partitioning of variables and interrelationships of the variables determined using the final reachability matrix. The findings reveal that current conceptualizations of digital government trustworthiness take a too narrow view. The findings can help government policy makers with understanding the interrelated factors associated with trustworthiness in the context of digital government services and implement them in effective strategic planning.","Citizens; digital government; electronic government; ISM; theory; trust; Trustworthiness","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:e86f3aa4-fbc5-43da-9eee-a12c66ac9b4b","http://resolver.tudelft.nl/uuid:e86f3aa4-fbc5-43da-9eee-a12c66ac9b4b","Examining open government data (OGD) usage in India through UTAUT framework","Saxena, Stuti (Central University of Haryana); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2017","Purpose: This paper aims to examine the use and acceptance of open government data (OGD) of different stakeholder groups in India. Design/methodology/approach: Following an empirical investigation among 244 respondents in India, the paper deploys path analysis via LISREL. The conceptual construction of the Unified Theory of Acceptance and Use of Technology (UTAUT) framework is used to assess the behavioral intention to use and accept OGD. Multiple regression analysis informs the relationship of demographic variables with the behavioral intention to use and accept OGD. Findings: Path analysis showed that there is an increased use and acceptance of OGD among the respondents. Multiple regression analysis shows that men are more likely to use open data sets than women. Individual differences are found among the respondents with regard to OGD usage. Thus, while men may tap open data sets in line with their purposes and professional backgrounds, women are likely to tap the data sets even for non-professional purposes. Furthermore, the respondents who are younger in age are more behaviorally inclined to accepting and using OGD than their older counterparts. Practical implications: The Indian government needs to popularize and familiarize OGD initiatives among the people to a greater extent. The utilitarian value of OGD may be provided when data sets are more user-friendly, frequently updated and accurate. This would facilitate in better provision of public services besides appreciating the public sentiment. Further, with increased interaction between citizens and the government, public accountability and transparency may be better realized. Social implications: The study shows that different groups of people are engaging in tapping information through government websites and related portals. Societal influence was found to be an important factor which predicts the acceptance and usage of OGD. An infrastructure can help to enable the use of OGD. Originality/value: Hitherto, studies have focused on OGD initiatives in the developed countries, but extant literature is scarce on developing countries. Therefore, this study seeks to fill the literature gap by probing OGD use and acceptance among different stakeholder groups in India.","Acceptance; India; Open data; Open government data; UTAUT","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:97da1a44-d621-4f28-9ff5-6568b4b18865","http://resolver.tudelft.nl/uuid:97da1a44-d621-4f28-9ff5-6568b4b18865","Antecedents of big data quality: An empirical examination in financial service organizations","Haryadi, Adiska Fardani; Hulstijn, Joris (Tilburg University); Wahyudi, A. (TU Delft Information and Communication Technology); van der Voort, H.G. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2017","Big data has been acknowledged for its enormous potential. In contrast to the potential, in a recent survey more than half of financial service organizations reported that big data has not delivered the expected value. One of the main reasons for this is related to data quality. The objective of this research is to identify the antecedents of big data quality in financial institutions. This will help to understand how data quality from big data analysis can be improved. For this, a literature review was performed and data was collected using three case studies, followed by content analysis. The overall findings indicate that there are no fundamentally new data quality issues in big data projects. Nevertheless, the complexity of the issues is higher, which makes it harder to assess and attain data quality in big data projects compared to the traditional projects. Ten antecedents of big data quality were identified encompassing data, technology, people, process and procedure, organization, and external aspects.","antecedents; big data; big data quality; data quality; finance","en","conference paper","Institute of Electrical and Electronics Engineers (IEEE)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:2cc59071-a69e-4eb8-911a-ffe8d724d489","http://resolver.tudelft.nl/uuid:2cc59071-a69e-4eb8-911a-ffe8d724d489","Assessment of nature-based flood defences' implementation potential: development and application of a game theory based method","Janssen, S.K.H. (TU Delft Policy Analysis); Hermans, L.M. (TU Delft Policy Analysis)","","2017","Nature-based flood defence (NBFD) by means of vegetated foreshores is an innovative flood protection strategy. In contrasts with traditional hard structures it combines nature and flood protection functions and employs natural dynamics. Introducing such an innovation into actual flood protection projects requires not just proper understanding of the physical aspects of the approach. Equally important is the understanding of governance implications as NBFD decision-making implies involvement of different actors and actor interactions and requires alternative governance arrangements to enable implementation. Moreover NBFD implementation is far from self-evident; in fact most of the time traditional solutions are preferred. In this report we look into the actor interactions that are associated with NBFD and aim to improve understanding of NBFD implementation in flood defence projects. For that purpose we develop and apply a game theory based research approach. The objective is to: 1) systematically describe actor interactions in NBFD decision-making and the benefits of potential actor coalitions in NBFD projects; 2) identify exemplary NBFD games; and 3) understand solutions to the NBFD games and factors that may foster NBFD implementation. The approach is applied it three Dutch NBFD case studies: the Sand Engine, Markermeer dikes and the Afsluitdijk.","nature-based flood defence; game theory; implementation; rational-choice theory; Netherlands","en","working paper","Delft University of Technology","","","","","","","","","","Policy Analysis","","",""
"uuid:2b15e4f8-066f-482b-a3c8-42a1393d4628","http://resolver.tudelft.nl/uuid:2b15e4f8-066f-482b-a3c8-42a1393d4628","An empirical validation of a unified model of electronic government adoption (UMEGA)","Dwivedi, Yogesh K. (Swansea University); Rana, Nripendra P. (Swansea University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Lal, Banita (University of Nottingham); Williams, Michael D. (Swansea University); Clement, Marc (Swansea University)","","2017","In electronic government (hereafter e-government), a large variety of technology adoption models are employed, which make researchers and policymakers puzzled about which one to use. In this research, nine well-known theoretical models of information technology adoption are evaluated and 29 different constructs are identified. A unified model of e-government adoption (UMEGA) is developed and validated using data gathered from 377 respondents from seven selected cities in India. The results indicate that the proposed unified model outperforms all other theoretical models, explaining the highest variance on behavioral intention, acceptable levels of fit indices, and significant relationships for each of the seven hypotheses. The UMEGA is a parsimonious model based on the e-government-specific context, whereas the constructs from the original technology adoption models were found to be inappropriate for the e-government context. By using the UMEGA, relevant e-government constructs were included. For further research, we recommend the development of e-government-specific scales.","Adoption; Context; Diffusion; E-government; India; Social cognitive theory; UMEGA; Unified model","en","journal article","","","","","","","","2019-08-26","","","Information and Communication Technology","","",""
"uuid:fc242982-4914-4ec3-a334-fc214beea45c","http://resolver.tudelft.nl/uuid:fc242982-4914-4ec3-a334-fc214beea45c","Factors Influencing Adoption of IoT for Data-driven Decision Making in Asset Management Organizations","Brous, P.A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Schraven, D.F.J. (TU Delft Integral Design & Management); Spiegeler, Jasper; Can Duzgun, Baris","","2017","Organizations tasked with managing large scale, public civil infrastructure are increasingly looking at data to drive their asset management decision-making processes. The Internet of Things (IoT) enables the creation of data that can be used to gain further insights into the current and predicted state of the infrastructure and may help automate the asset management process. Yet, it remains unclear to what extent data from IoT impacts decision-making in public asset management organizations. The objective of this paper is to explore
implementation factors for adoption of new data sources for decision-making in asset management organizations. Based on a systematic literature review and case studies in the asset management domain, this paper derives the current use and expectations of new data sources for decision-making in asset management. The paper concludes that although recent technological developments have enabled the deployment of IoT for asset management, the current level of adoption remains low. The inherent complexity of adopting a datadriven approach to asset management requires an effective data governance strategy to ensure data quality, manage expectations, build trust and integrate IoT data in decision-making processes.","","en","conference paper","","","","","","","","","","","Integral Design & Management","","",""
"uuid:66577402-d334-4591-a671-cb2fdd5091f8","http://resolver.tudelft.nl/uuid:66577402-d334-4591-a671-cb2fdd5091f8","Exploring the implementation blind spots: Selective Decoupling of Freedom of Information","Kuk, George (Nottingham Trent University); Chim, Jimmy (Nottingham Trent University); Giamporcaro, Stephanie (Nottingham Trent University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2017","The right to know under the Freedom of Information (FOI) Act in the UK has made public authorities as the duty-bearer, often making them to selectively decouple practices from policies. This has resulted in disclosing data that may derail from the intended goals of open government. By analyzing the top fifty requesters who made 34,314 requests, we examine how the same requests can result in varying responses. Our preliminary findings suggest four implementation blind spots. The first entails data disclosure that contravene privacy and the second disclosure can potentially jeopardize the long-standing stakeholder relationship. Whereas the last two types withhold information despite it is in the public interests. The findings offer a counterintuitive insight that public authorities are willing to disclose information in support of transparency and accountability and to withhold information that is not in the public interests. We find the opposite with private pursuits superseding public interests.","Freedom of Information; Implementation blind spots; Selective decoupling","en","conference paper","Association for Information Systems","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9f753331-755e-4455-8f33-cbc312e4be1e","http://resolver.tudelft.nl/uuid:9f753331-755e-4455-8f33-cbc312e4be1e","Building & sustaining a digital government research center: A director's perspective","Pardo, Theresa A. (University at Albany - State University of New York); Parycek, Peter (Danube University Krems); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Zheng, Lei (Fudan University); Cunha, Maria Alexandra (São Paulo School of Business)","","2017","This panel provides participants a chance to interact with five digital government research center directors about their experiences in building sustainable digital government research centers. Panelists, selected to provide regional representation, will discuss their experiences and share lessons learned. Topics to be covered building a research agenda, building mutually beneficial partnerships, fund raising, finding and developing talent and engaging with university, funding, and other institutional partners. Following the formal remarks participants will be invited to raise additional topics of interest for discussion with the Directors on the panel.","Building & sustaining a research program; Digital government; Diverse partnerships; E-government; Funding; Research directors; Researchprogram","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:72423261-8723-4b2e-962a-c0d5bda2c222","http://resolver.tudelft.nl/uuid:72423261-8723-4b2e-962a-c0d5bda2c222","Data Collaboratives: How to create value from data for public problem solving? Panel","Susha, I. (TU Delft Information and Communication Technology); Verhulst, Stefaan (New York University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Pardo, Theresa (University at Albany - State University of New York)","","2017","This panel is dedicated to the theme of 'data collaboratives', a novel form of public private partnership to leverage data for addressing societal challenges. The panel brings together prolific researchers and practitioners to share lessons and discuss how value is created from data collaboratives for the solving of public problems. The panel will highlight prominent examples of data collaboratives at international, national, and regional/city-levels and discuss the value creation mechanisms underlying them, as well as more broadly best practices and challenges associated with data collaboratives. The panel offers an opportunity for conference attendees to engage with this emerging new theme through interactive discussions and presentations of cutting-edge research and practice.","Big data; Data collaboratives; Data science; Open data; Societal challenges; Value creation","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:17c5e959-3f00-404c-b4db-748968bdcc2c","http://resolver.tudelft.nl/uuid:17c5e959-3f00-404c-b4db-748968bdcc2c","Blockchain in government: Benefits and implications of distributed ledger technology for information sharing","Ølnes, Svein (Western Norway Research Institute); Ubacht, J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2017","Blockchain refers to a range of general purpose technologies to exchange information and transact digital assets in distributed networks. The core question addressed in this paper is whether blockchain technology will lead to innovation and transformation of governmental processes. To address this question we present a critical assessment of the often exaggerated benefits of blockchain technology found in the literature and discuss their implications for governmental organizations and processes. We plea for a shift from a technology-driven to need-driven approach in which blockchain applications are customized to ensure a fit with requirements of administrative processes and in which the administrative processes are changed to benefit from the technology. Having sound governance models are found to be a condition for realizing benefits. Based on a critical assessment we offer directions for further research into the potential benefits of BC applications in e-government and the role of governance of BC architectures and applications to comply with societal needs and public values.","Applications; Blockchain; Distributed ledger; Information sharing; Intermediation; Smart contracts; Transforming government; Trust","en","journal article","","","","","","","","2019-11-10","","","Information and Communication Technology","","",""
"uuid:3f731530-de26-4909-848b-819f1f70facc","http://resolver.tudelft.nl/uuid:3f731530-de26-4909-848b-819f1f70facc","Quantum simulation of a Fermi-Hubbard model using a semiconductor quantum dot array","Hensgens, T. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft); Fujita, T. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft); Janssen, L. (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft); Li, Xiao (University of Maryland); van Diepen, C.J. (TU Delft QCD/Vandersypen Lab; TNO); Reichl, C (ETH Zürich); Wegscheider, W (ETH Zürich); Das Sarma, S (University of Maryland); Vandersypen, L.M.K. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)","","2017","Interacting fermions on a lattice can develop strong quantum correlations, which are the cause of the classical intractability of many exotic phases of matter. Current efforts are directed towards the control of artificial quantum systems that can be made to emulate the underlying Fermi-Hubbard models. Electrostatically confined conduction-band electrons define interacting quantum coherent spin and charge degrees of freedom that allow all-electrical initialization of low-entropy states and readily adhere to the Fermi-Hubbard Hamiltonian. Until now, however, the substantial electrostatic disorder of the solid state has meant that only a few attempts at emulating Fermi-Hubbard physics on solid-state platforms have been made. Here we show that for gate-defined quantum dots this disorder can be suppressed in a controlled manner. Using a semi-automated and scalable set of experimental tools, we homogeneously and independently set up the electron filling and nearest-neighbour tunnel coupling in a semiconductor quantum dot array so as to simulate a Fermi-Hubbard system. With this set-up, we realize a detailed characterization of the collective Coulomb blockade transition, which is the finite-size analogue of the interaction-driven Mott metal-to-insulator transition. As automation and device fabrication of semiconductor quantum dots continue to improve, the ideas presented here will enable the investigation of the physics of ever more complex many-body states using quantum dots.","","en","journal article","","","","","","Accepted Author Manuscript","","2018-02-03","Electrical Engineering, Mathematics and Computer Science","","QCD/Vandersypen Lab","","",""
"uuid:0a86828c-97fd-48db-b33e-821711b36983","http://resolver.tudelft.nl/uuid:0a86828c-97fd-48db-b33e-821711b36983","Opening More Data: A New Privacy Risk Scoring Model for Open Data","Ali-Eldin, A.M.T. (TU Delft Information and Communication Technology; Universiteit Leiden; Mansoura University); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2017","While the opening of data has become a common practice for both governments and companies, many datasets are still not published since they might violate privacy regulations. The risk on privacy violations is a factor that often blocks the publication of data and results in a reserved attitude of governments and companies. Additionally, even published data, which might seem privacy compliant, can violate user privacy due to the leakage of real user identities. This paper proposes a privacy risk scoring model for open data architectures to analyse and reduce the risks associated with the opening of data. The key elements consist of a new set of open data attributes reflecting privacy risks versus benefits trades-offs. Further, these attributes are evaluated using a decision engine and a scoring matrix intro a privacy risk indicator (PRI) and a privacy risk mitigation measure (PRMM). Privacy Risk Indicator (PRI) represents the predicted value of privacy risks associated with opening such data and privacy risk mitigation measures represent the measurements need to be applied on the data to avoid the expected privacy risks. The model is exemplified through five real use cases concerning open datasets.","open data; open government; privacy; risk; data release; data mining; scoring system","en","conference paper","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:3e297dbd-b7f5-45b8-9c36-e789036e3c8a","http://resolver.tudelft.nl/uuid:3e297dbd-b7f5-45b8-9c36-e789036e3c8a","Impact wear of structural steel with yield strength of 235 MPa in various liquids","Liu, Y. (TU Delft Micro and Nano Engineering; Material Innovation Institute (M2i)); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering)","","2017","The wear of pipelines, used in slurry transport, results in high costs for maintenance and replacement. The wear mechanism involves abrasion, corrosion, impact, and the interaction among them. In this work, we study the effect of impact on the wear mechanism and wear rate. Results show that when the effect of impact is small, the wear mechanism is dominated by electrochemically induced surface modification, which leads to a lower wear rate in a corrosive environment than in a non-corrosive environment. By contrast, when the effect of impact is large, the wear mechanism is drastically altered. In that regime plastic deformation is important. The influence of corrosion in the high impact regime can be neglected. Our findings show the importance of including impact effect in the distinction of wear of slurry pipes","wear; corrosion; impact; deformation; surface modification; OA-Fund TU Delft","en","journal article","","","","","","","","","","","Micro and Nano Engineering","","",""
"uuid:39430b3e-071d-4462-8523-4967540e879e","http://resolver.tudelft.nl/uuid:39430b3e-071d-4462-8523-4967540e879e","Friction and dynamically dissipated energy dependence on temperature in polycrystalline silicon MEMS devices","Gkouzou, A. (TU Delft Micro and Nano Engineering); Kokorian, J. (TU Delft Micro and Nano Engineering; Philips Medical Systems Nederland NV); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering); van Spengen, W.M. (TU Delft Micro and Nano Engineering; Falco Systems)","","2017","In this paper, we report on the influence of capillary condensation on the sliding friction of sidewall surfaces in polycrystalline silicon micro-electromechanical
systems (MEMS). We developed a polycrystalline silicon MEMS tribometer, which is a microscale test device with two components subject to sliding contact. One of the components can be heated in situ by Joule heating to set the temperature of the contact and thereby control the capillary kinetics at the MEMS sidewalls. We used an optical displacement measurement technique to record the stick–slip
motion of the slider with sub-nanometer resolution, and we assessed the friction force with nanonewton resolution. All friction measurements were performed under controlled ambient conditions while sweeping the contact temperature
from room temperature to 300 C, and from 300 C to room temperature. We were able to distinguish the two ways in which energy is dissipated during sliding: the
‘semi-statically’ dissipated energy attributed to asperity deformation and contact yield, and the dynamically dissipated energy ascribed to the release of the tension in the slider during slip events. We observed an increase in the
dynamically dissipated energy at 80 C while sweeping down in temperature. This increase is caused by higher adhesion due to capillary condensation between the conformal surfaces. Our study highlights how energy is dissipated during the sliding contact of MEMS sidewalls, and it is helpful in overcoming friction in multi-asperity systems.
+-type polysilicon (polySi) and its application as a carrier selective rear contact in a bifacial n-type solar cell comprising fire-through screen-printed metallization and 6"" Cz wafers. The cells were manufactured with low-cost industrial process steps yielding Vocs from 676 to 683 mV and Jscs above 39.4 mA/cm2 indicating an efficiency potential of 22%. The aim of this study is to understand which material properties determine the performance of POCl3-diffused (n-type) polySi-based passivating contacts and to find routes to improve its use for industrial PERPoly (Passivated Emitter Rear PolySi) cells from the point of view of throughput, performance, and bifacial application. This paper reports on correlations between the parameters used for low pressure chemical vapour deposition (LPCVD), annealing, and doping on optical, structural, and electronic properties of the polySi-based passivating contact and the subsequent influence on the solar cell parameters.","Bifacial; Carrier selective contact; industrial n-type solar cell; LPCVD; Passivating contact; Polysilicon","en","journal article","","","","","","","","","","","Photovoltaic Materials and Devices","","",""
"uuid:8b277229-6a8c-4e8f-942f-9c485da1e1ce","http://resolver.tudelft.nl/uuid:8b277229-6a8c-4e8f-942f-9c485da1e1ce","Multiwavelength observations of active galactic nuclei: Using current facilities and development of enabling technologies","Janssen, R.M.J. (TU Delft QN/Klapwijk Lab)","Klapwijk, T.M. (promotor); Rottgering, HJA (promotor); Baselmans, J.J.A. (copromotor); Delft University of Technology (degree granting institution)","2017","At the center of every galaxy there is a super-massive black hole of a million or more solar masses. In most galaxies the presence of this black hole can only be detected through its gravitational attraction, which affects the motion of nearby stars. However, in about 10% of the galaxies the super-massive black hole is the engine of one of the most luminous phenomena in the universe: an active galactic nucleus (AGN). In the local universe there are two types of AGN: ‘Radiative-mode’ and ‘Jet-mode’ AGN. In this thesis I show that these two AGN types are hosted by different galaxies and have different infrared properties. ‘Radiative-mode’ AGN are the ‘classical’ AGN which are bright emitters across the entire electromagnetic spectrum. They are thought to be powered by a super-massive black hole accreting matter at a high rate. I show that ‘radiative-mode’ AGN are predominantly found in intermediate mass galaxies with blue and green optical colors. These colors are indicative of active or recently terminated star formation and a young stellar population. Due to the presence of torus of hot dust near the black hole, galaxies with a ‘radiative-mode’ AGN typically show an excess of mid-infrared emission. ‘Jet-mode’ AGN lack the bright optical emission and excess infrared emission of ‘jet-mode’
AGN and can only be identified by means of their radio jet – a stream of relativistic particles that can reach far outside the AGN’s host galaxy. This absence of electromagnetic radiation and prominence of the radio jet is thought to be the result of the low accretion rate of the super-massive black hole driving this AGN type. I show that ‘jet-mode’ AGN have a strong preference for the most massive galaxies, which typically have little star formation. The presence or absence of a dusty torus and the resulting difference in broadband mid-infrared emission could be a powerful tool to separate ‘radiative-mode’ and ‘jet-mode’ AGN without using spectroscopy. Unfortunately, the inherent scatter in the mid-infrared emission of galaxies due to dust heated by stars is too large to separate the two populations reliably.
Far-infrared observations could help resolve this, by constraining the mid-infrared contribution of dust heated by stars. However, current far-infrared surveys do not have the depth or the area to give the number statistics required to calibrate this procedure. In this thesis I have investigated the properties of microwave kinetic inductance detectors. These detectors will enable the far-infrared instruments with 10.000 pixels as a result of their inherent potential for frequency domain multiplexing. This is a huge leap from the 100 pixel far-infrared instruments currently on telescopes. I have shown that microwave kinetic inductance detectors made from NbTiN and Al can satisfy all the requirements to enable a new generation of large format far-infrared cameras, which are required to constrain the far-infrared emission of many galaxies.","","en","doctoral thesis","","978-90-8593-285-7","","","","Casimir PhD Series, Delft-Leiden, 2016-40","","","","","QN/Klapwijk Lab","","",""
"uuid:9e41144d-6c4a-41ee-a178-ce78a6e7e5e6","http://resolver.tudelft.nl/uuid:9e41144d-6c4a-41ee-a178-ce78a6e7e5e6","Mutations in PMR1 stimulate xylose isomerase activity and anaerobic growth on xylose of engineered Saccharomyces cerevisiae by influencing manganese homeostasis","Verhoeven, M.D. (TU Delft BT/Industriele Microbiologie); Lee, Misun (Rijksuniversiteit Groningen); Kamoen, L. (Student TU Delft); van den Broek, M.A. (TU Delft BT/Industriele Microbiologie); Janssen, Dick B. (Rijksuniversiteit Groningen); Daran, J.G. (TU Delft BT/Industriele Microbiologie); van Maris, A.J.A. (TU Delft BT/Industriele Microbiologie); Pronk, J.T. (TU Delft BT/Industriele Microbiologie)","","2017","Combined overexpression of xylulokinase, pentose-phosphate-pathway enzymes and a heterologous xylose isomerase (XI) is required but insufficient for anaerobic growth of Saccharomyces cerevisiae on d-xylose. Single-step Cas9-assisted implementation of these modifications yielded a yeast strain expressing Piromyces XI that showed fast aerobic growth on d-xylose. However, anaerobic growth required a 12-day adaptation period. Xylose-adapted cultures carried mutations in PMR1, encoding a Golgi Ca2+/Mn2+ ATPase. Deleting PMR1 in the parental XI-expressing strain enabled instantaneous anaerobic growth on d-xylose. In pmr1 strains, intracellular Mn2+ concentrations were much higher than in the parental strain. XI activity assays in cell extracts and reconstitution experiments with purified XI apoenzyme showed superior enzyme kinetics with Mn2+ relative to other divalent metal ions. This study indicates engineering of metal homeostasis as a relevant approach for optimization of metabolic pathways involving metal-dependent enzymes. Specifically, it identifies metal interactions of heterologous XIs as an underexplored aspect of engineering xylose metabolism in yeast.","","en","journal article","","","","","","","","","","","BT/Industriele Microbiologie","","",""
"uuid:df605f20-e4a5-4e16-a95a-63f854b8ff80","http://resolver.tudelft.nl/uuid:df605f20-e4a5-4e16-a95a-63f854b8ff80","Immiscible N2 Injection for EOR: An Experimental Comparison Study","Janssen, M.T.G. (TU Delft Reservoir Engineering); Azimi, F.; Zitha, P.L.J. (TU Delft Reservoir Engineering)","","2017","","","en","abstract","","","","","","","","2018-05-01","","","Reservoir Engineering","","",""
"uuid:87544f38-e6f9-4146-9119-76631f4ce507","http://resolver.tudelft.nl/uuid:87544f38-e6f9-4146-9119-76631f4ce507","Agent-based Security and Efficiency Estimation in Airport Terminals","Janssen, S.A.M. (TU Delft Air Transport & Operations)","","2017","We investigate the use of an Agent-based framework to identify and quantify the relationship between security and efficiency within airport terminals. In this framework, we define a novel Security Risk Assessment methodology that explicitly models attacker and defender behavior in a security scenario. It produces a security risk vector, quantifying the risks to the airport terminal. Efficiency is calculated in the same model using so-called key efficiency indicators. By using this framework, we aim to find and quantify factors that influence both security and efficiency in airport terminals. These factors can then be used to enable informed multi-objective decision making by airport management.","Agent-based Modelling; Airport Terminal; Security Risk Assessment; Eciency","en","conference paper","International Foundation for Autonomous Agents and Multiagent Systems (IFAAMAS)","","","","","","","","","","Air Transport & Operations","","",""
"uuid:9ca0d208-ace1-4674-9a58-2b0d5fa4f5cc","http://resolver.tudelft.nl/uuid:9ca0d208-ace1-4674-9a58-2b0d5fa4f5cc","Spatial identification of critical nutrient loads of large shallow lakes: Implications for Lake Taihu (China)","Janssen, Annette B.G. (Netherlands Institute of Ecology; Wageningen University & Research); de Jager, Victor C.L. (Netherlands Institute of Ecology); Janse, Jan H. (Netherlands Institute of Ecology; PBL Netherlands Environmental Assessment Agency); Kong, Xiangzhen (Netherlands Institute of Ecology; Peking University); Liu, S. (TU Delft Coastal Engineering; Deltares); Ye, Qinghua (TU Delft Coastal Engineering; Deltares); Mooij, Wolf M. (Netherlands Institute of Ecology; Wageningen University & Research)","","2017","Ongoing eutrophication frequently causes toxic phytoplankton blooms. This induces huge worldwide challenges for drinking water quality, food security and public health. Of crucial importance in avoiding and reducing blooms is to determine the maximum nutrient load ecosystems can absorb, while remaining in a good ecological state. These so called critical nutrient loads for lakes depend on the shape of the load-response curve. Due to spatial variation within lakes, load-response curves and therefore critical nutrient loads could vary throughout the lake. In this study we determine spatial patterns in critical nutrient loads for Lake Taihu (China) with a novel modelling approach called Spatial Ecosystem Bifurcation Analysis (SEBA). SEBA evaluates the impact of the lake's total external nutrient load on the local lake dynamics, resulting in a map of critical nutrient loads for different locations throughout the lake. Our analysis shows that the largest part of Lake Taihu follows a nonlinear load-response curve without hysteresis. The corresponding critical nutrient loads vary within the lake and depend on management goals, i.e. the maximum allowable chlorophyll concentration. According to our model, total nutrient loads need to be more than halved to reach chlorophyll-a concentrations of 30–40 μg L−1 in most sections of the lake. To prevent phytoplankton blooms with 20 μg L−1 chlorophyll-a throughout Lake Taihu, both phosphorus and nitrogen loads need a nearly 90% reduction. We conclude that our approach is of great value to determine critical nutrient loads of lake ecosystems such as Taihu and likely of spatially heterogeneous ecosystems in general.","Algal blooms; Bifurcation analysis; Eutrophication; Load-response curve; PCLake; Spatial heterogeneity","en","journal article","","","","","","","","","","","Coastal Engineering","","",""
"uuid:113a5cc0-4043-4b76-aa37-962c23d57047","http://resolver.tudelft.nl/uuid:113a5cc0-4043-4b76-aa37-962c23d57047","Sex differences in longitudinal pathways from parenting to delinquency","Janssen, H.J. (TU Delft OLD Urban Renewal and Housing); Eichelsheim, Veroni I. (Netherlands Institute for the Study of Crime and Law Enforcement (NSCR)); Deković, Maja (Universiteit Utrecht); Bruinsma, Gerben J.N. (Netherlands Institute for the Study of Crime and Law Enforcement (NSCR))","","2017","In the current study, we examined longitudinally whether boys and girls differed in pathways from parenting to delinquency. Longitudinal mediational models were tested for boys and girls separately in which three parenting dimensions (i.e., monitoring, limit setting, and the quality of the parent-adolescent relationship) were hypothesized to influence adolescents’ level of self-control, delinquent attitudes, peer delinquency, and time spent in criminogenic settings, which in turn, were hypothesized to affect delinquency. Using data of 603 adolescents (11–17 years of age at T1) we found mean level differences between boys and girls in parental monitoring, parental limit-setting, self-control, delinquent attitudes, and peer delinquency. The results suggest furthermore that the model linking parenting to delinquency is similar for boys and girls. We found, however, that the indirect effect from the quality of the parent-adolescent relationship through self-control is stronger for girls than for boys.","Adolescent delinquency; Criminogenic settings; Gender differences; Parenting; Peer delinquency; Self-control","en","journal article","","","","","","","","","","","OLD Urban Renewal and Housing","","",""
"uuid:fc4c84fd-81e0-490a-b077-0f60c25fe7a6","http://resolver.tudelft.nl/uuid:fc4c84fd-81e0-490a-b077-0f60c25fe7a6","Transport Properties of a Two-Dimensional PbSe Square Superstructure in an Electrolyte-Gated Transistor","Alimoradi Jazi, M. (Universiteit Utrecht); Janssen, V.A.E.C. (TU Delft QN/van der Zant Lab); Evers, W.H. (TU Delft QN/van der Zant Lab); Tadjine, A. (IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie); Delerue, C (IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie); Siebbeles, L.D.A. (TU Delft ChemE/Opto-electronic Materials); van der Zant, H.S.J. (TU Delft QN/van der Zant Lab); Houtepen, A.J. (TU Delft ChemE/Opto-electronic Materials); Vanmaekelbergh, D (Universiteit Utrecht)","","2017","Self-assembled nanocrystal solids show promise as a versatile platform for novel optoelectronic materials. Superlattices composed of a single layer of lead-chalcogenide and cadmium-chalcogenide nanocrystals with epitaxial connections between the nanocrystals, present outstanding questions to the community regarding their predicted band structure and electronic transport properties. However, the as-prepared materials are intrinsic semiconductors; to occupy the bands in a controlled way, chemical doping or external gating is required. Here, we show that square superlattices of PbSe nanocrystals can be incorporated as a nanocrystal monolayer in a transistor setup with an electrolyte gate. The electron (and hole) density can be controlled by the gate potential, up to 8 electrons per nanocrystal site. The electron mobility at room temperature is 18 cm2/(V s). Our work forms a first step in the investigation of the band structure and electronic transport properties of two-dimensional nanocrystal superlattices with controlled geometry, chemical composition, and carrier density.","2D superstructure; electrolyte gating; optoelectrical characterization; oriented attachment; self-assembly","en","journal article","","","","","","","","","","","QN/van der Zant Lab","","",""
"uuid:205e74a9-6aac-47d6-b494-8993983600e9","http://resolver.tudelft.nl/uuid:205e74a9-6aac-47d6-b494-8993983600e9","Evaluating an mHealth App for Health and Well-Being at Work: Mixed-Method Qualitative Study","de Korte, E.M. (TU Delft Applied Ergonomics and Design; TNO); Wiezer, Noortje (TNO); Janssen, Joris (FocusCura); Vink, P. (TU Delft Applied Ergonomics and Design); Kraaij, Wessel (TNO; Universiteit Leiden)","","2018","Background: To improve workers’ health and well-being, workplace interventions have been developed, but utilization and reach are unsatisfactory, and effects are small. In recent years, new approaches such as mobile health (mHealth) apps are being developed, but the evidence base is poor. Research is needed to examine its potential and to assess when, where, and for whom mHealth is efficacious in the occupational setting. To develop interventions for workers that actually will be adopted, insight into user satisfaction and technology acceptance is necessary. For this purpose, various qualitative evaluation methods are available.
Objective: The objectives of this study were to gain insight into (1) the opinions and experiences of employees and experts on drivers and barriers using an mHealth app in the working context and (2) the added value of three different qualitative methods that are available to evaluate mHealth apps in a working context: interviews with employees, focus groups with employees, and a focus group with experts.
Methods: Employees of a high-tech company and experts were asked to use an mHealth app for at least 3 weeks before participating in a qualitative evaluation. Twenty-two employees participated in interviews, 15 employees participated in three focus groups, and 6 experts participated in one focus group. Two researchers independently coded, categorized, and analyzed all quotes yielded from these evaluation methods with a codebook using constructs from user satisfaction and technology acceptance theories.
Results: Interviewing employees yielded 785 quotes, focus groups with employees yielded 266 quotes, and the focus group with experts yielded 132 quotes. Overall, participants muted enthusiasm about the app. Combined results from the three evaluation methods showed drivers and barriers for technology, user characteristics, context, privacy, and autonomy. A comparison between the three qualitative methods showed that issues revealed by experts only slightly overlapped with those expressed by employees. In addition, it was seen that the type of evaluation yielded different results.
Conclusions: Findings from this study provide the following recommendations for organizations that are planning to provide mHealth apps to their workers and for developers of mHealth apps: (1) system performance influences adoption and adherence, (2) relevancy and benefits of the mHealth app should be clear to the user and should address users’ characteristics, (3) app should take into account the work context, and (4) employees should be alerted to their right to privacy and use of personal data. Furthermore, a qualitative evaluation of mHealth apps in a work setting might benefit from combining more than one method. Factors to consider when selecting a qualitative research method are the design, development stage, and implementation of the app; the working context in which it is being used; employees’ mental models; practicability; resources; and skills required of experts and users.","mHealth; work; qualitative research methods; interview; focus group; technology acceptance; user satisfaction; usability; well-being; prevention; OA-Fund TU Delft","en","journal article","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:09f498e9-39ca-484d-bebc-4bef4e7130d1","http://resolver.tudelft.nl/uuid:09f498e9-39ca-484d-bebc-4bef4e7130d1","Social Media: The Good, the Bad, and the Ugly","Dwivedi, Yogesh K. (Swansea University); Kelly, Gerald (Sony UK Technology Centre); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Rana, Nripendra P. (Swansea University); Slade, Emma L. (University of Bristol); Clement, Marc (Swansea University)","","2018","","","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-09-22","","","Information and Communication Technology","","",""
"uuid:23477f4a-7845-4b21-be27-b16cf3feea65","http://resolver.tudelft.nl/uuid:23477f4a-7845-4b21-be27-b16cf3feea65","Multidisciplinary Collaboration Through Online Virtual Research Environments (VREs): What do VRE users need?","Yin, Y. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); de Ronde, Xander (Student TU Delft); Jeffery, Keith (ERCIM)","","2018","Making new data combinations and collaborating with researchers from different disciplines are becoming essential ingredients of scientific research. These activities are increasingly contributing to solutions for multidisciplinary global problems, such as climate change and energy transition. Virtual Research Environments (VREs) can potentially support making data combinations and researcher collaborations by providing a multiplicity of data and services. Many VREs have been developed already and are used in specific research domains. However, there is a lack of insight into what is needed to develop a multidisciplinary VRE in comparison with monodisciplinary VREs. This is currently blocking the development of innovative multidisciplinary VREs. This study aims to investigate the requirements for building a multidisciplinary VRE and to study the key differences between monodisciplinary VREs and multidisciplinary VREs. Our study shows that comprehensive requirements in nine categories need to be fulfilled when designing a multidisciplinary VRE. Lack of considering many requirements and limit focus in monodisciplinary VREs hinder the wide use of current VREs in multidisciplinary research.","VRE; research data sharing; requirements; multidisciplinary Virtual Research Environment; science gateway","en","conference paper","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:204d2bf6-62c7-44cb-9293-bfbd7e39b658","http://resolver.tudelft.nl/uuid:204d2bf6-62c7-44cb-9293-bfbd7e39b658","Citizen engagement in an open election data initiative: A case study of Indonesian's ""Kawal Pemilu""","Purwanto, A. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Zuiderwijk, Anneke (editor); Hinnant, Charles (editor)","2018","Citizen engagement is key to the successful and sustainable use of Open Government Data (OGD), involving multiple activities ranging from the retrieval and conversion of raw data to OGD based applications, to the use of these applications to solve societal problems. However, there is a lack of insight into what drives citizens to engage in OGD initiatives. Such insight helps inform policymakers in stimulating and improving the engage ability of an OGD program. This study aims to identify factors that influence why citizens engage in OGD initiatives. To attain this objective, we conducted a single case study of citizen engagement in an open election data initiative in Indonesia. Our study shows that social altruism as an intrinsic motivation is a strong driver for citizens to start and continue engaging with open election data. Low data quality appeared not to hinder citizens from engaging in the OGD initiative; in contrast, it can lead to more engagement. Election is typically concerning with political participation, yet trust and political efficacy factors only marginally influenced citizen engagement in our case study. The case shows that, in a time-critical situation where potential social conflicts were seen to threaten the citizens' lives, collective actions are enabled by the availability of OGD. We draw some key lessons learnt for policymakers to enhance OGD engage ability. Further research is needed to examine whether factors found in this particular case also apply in different settings.","Open government data; Open Data; Citizen Engagement; Development; Case Study; Indonesia; Election","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-12-01","","","Information and Communication Technology","","",""
"uuid:5061ce8e-a5be-401c-8927-2c7e83a4dd2d","http://resolver.tudelft.nl/uuid:5061ce8e-a5be-401c-8927-2c7e83a4dd2d","Standards battles for business-to-government data exchange: Identifying success factors for standard dominance using the Best Worst Method","van de Kaa, G. (TU Delft Economics of Technology and Innovation); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Rezaei, J. (TU Delft Transport and Logistics)","","2018","Businesses are obliged to report all kinds of data to the government. In the past this was paper-based, and over time Electronic Data Interchange (EDI) types of solutions have been implemented. The new eXtensible Business Reporting Language (XBRL) standard seems to have replaced EDI types of solutions. This paper applies the Best Worst Method to identify the key factors that lead to the dominance of these business reporting standards. The results show that the key factors for standard dominance are the overall commitment of key stakeholders, timing of entry, and installed base, and suggest that XBRL has the best chance of becoming the dominant standard, replacing EDI as the standard for business reporting. However, this will take time due to the installed base of systems.","Best Worst Method; EDI; Information exchange; SBR; Standards battles; XBRL; XML","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-01-24","","","Economics of Technology and Innovation","","",""
"uuid:fa822ab1-7a58-4df0-8c12-b049de6f148c","http://resolver.tudelft.nl/uuid:fa822ab1-7a58-4df0-8c12-b049de6f148c","A multiple-criteria algorithm for smart parking: Making fair and preferred parking reservations in smart cities","Rehena, Z. (TU Delft Information and Communication Technology); Mondal, Md Ashifuddin (Narula Institute of Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","Smart cities are struggling with using public space efficiently and decreasing pollution at the same time. For this governments have embraced smart parking initiatives, which should result in a high utilization of public space and minimization of the driving, in this way reducing the emissions of cars. Yet, simply opening data about the availability of public spaces results in more congestions as multiple cars might be heading for the same parking space. In this work, we propose a Multiple Criteria based Parking space Reservation (MCPR) algorithm, for reserving a space for a user to deal with parking space in a fair way. Users' requirements are the main driving factor for the algorithm and used as criteria in MCPR. To evaluate the algorithm, simulations for three set of user preferences were made. The simulation results show that the algorithm satisfied the users' request fairly for all the three preferences. The algorithm helps users automatically to find a parking space according to the users' requirements. The algorithm can be used in a smart parking system to search for a parking space on behalf of user and send parking space information to the user.","Multiple-criteria decision analysis; Reservation algorithm; Smart city; Smart parking","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-12-01","","","Information and Communication Technology","","",""
"uuid:75714608-5765-4561-b534-f68b4ce7f126","http://resolver.tudelft.nl/uuid:75714608-5765-4561-b534-f68b4ce7f126","Comparing the openness of archetypical business-to-government information sharing architectures: balancing advantages of openness with the control of risks","van Engelenburg, S.H. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Klievink, A.J. (TU Delft Organisation & Governance); Tan, Y. (TU Delft Information and Communication Technology); Rukanova, B.D. (TU Delft Information and Communication Technology)","","2018","Business-to-government (B2G) information sharing can benefit government organisations, as well as businesses. Yet, businesses are often reluctant to share, as data sharing might not just provide benefits but also entails risks. Therefore, a system supporting B2G information sharing should provide the appropriate level of openness, such that the advantages of openness and possibilities to control risks for businesses are balanced. At the same time, the information obtained by the government should be useful. We identified three architectural layers at which B2G information sharing architectures can have different levels of openness, viz. the Software Layer, the Access Control Layer and the Data Layer. In this work, we compare three archetypical configurations of architectures for B2G information sharing with different levels of openness. Our aim is to provide insight into their impact on the possibilities for obtaining advantages from information sharing and managing risks of opening up data. We found that the relationship between the different levels of openness and the advantages and risks of information sharing is highly complex. We discuss this complexity and find that different levels of openness are appropriate in different situations.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-12-31","","","Information and Communication Technology","","",""
"uuid:eb03ba8b-a4ec-4754-9f63-41a0774c531a","http://resolver.tudelft.nl/uuid:eb03ba8b-a4ec-4754-9f63-41a0774c531a","AATOM - An Agent-based Airport Terminal Operations Model","Janssen, S.A.M. (TU Delft Air Transport & Operations); Blok, Anne-Nynke (Student TU Delft); Knol, Arthur (Student TU Delft)","","2018","In this work, AATOM, a microscopic agent-based model that simulates movement and operations in the airport terminal is presented. Specifcally, the model includes the main handling processes required for outbound passengers namely, check-in, security and border control. Furthermore, basic facilities for discretionary activities are modelled namely, bathrooms, restaurants and shops. The model has an accompanying architecture, the AATOM architecture that is described in this work as well. The objective of the model is to serve as a basis for several studies in the area of airport terminal operations. It will be used to investigate properties in the fields of security, efficiency, resilience and
possibly other fields like safety, and it will be used to investigate the relationship between any of these
areas.","Agent-based Model; Airport Terminal","en","report","TU Deflt","","","","","","","","","","Air Transport & Operations","","",""
"uuid:2f89be95-c0cf-4412-8aeb-4bf15406b590","http://resolver.tudelft.nl/uuid:2f89be95-c0cf-4412-8aeb-4bf15406b590","Internet of Things adoption for reconfiguring decision-making processes in asset management","Brous, P.A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Herder, P.M. (TU Delft Energie and Industrie)","","2018","Purpose: Managers are increasingly looking to adopt the Internet of Things (IoT) to include the vast amount of big data generated in their decision-making processes. The use of IoT might yield many benefits for organizations engaged in civil infrastructure management, but these benefits might be difficult to realize as organizations are not equipped to handle and interpret this data. The purpose of this paper is to understand how IoT adoption affects decision-making processes. Design/methodology/approach: In this paper the changes in the business processes for managing civil infrastructure assets brought about by IoT adoption are analyzed by investigating two case studies within the water management domain. Propositions for effective IoT adoption in decision-making processes are derived. Findings: The results show that decision processes in civil infrastructure asset management have been transformed to deal with the real-time nature of the data. The authors found the need to make organizational and business process changes, development of new capabilities, data provenance and governance and the need for standardization. IoT can have a transformative effect on business processes. Research limitations/implications: Because of the chosen research approach, the research results may lack generalizability. Therefore, researchers are encouraged to test the propositions further. Practical implications: The paper shows that data provenance is necessary to be able to understand the value and the quality of the data often generated by various organizations. Managers need to adapt new capabilities to be able to interpret the data. Originality/value: This paper fulfills an identified need to understand how IoT adoption affects decision-making processes in asset management in order to be able to achieve expected benefits and mitigate risk.","Adoption; Asset management; Business process; Internet of Things; IoT","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:21c0b325-2454-4219-9193-f5472fe0c469","http://resolver.tudelft.nl/uuid:21c0b325-2454-4219-9193-f5472fe0c469","Polarization and acculturation in US Election 2016 outcomes – Can twitter analytics predict changes in voting preferences","Grover, Purva (Indian Institute of Technology Delhi); Kar, Arpan Kumar (Indian Institute of Technology Delhi); Dwivedi, Yogesh K. (Swansea University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","Elections are among the most critical events in a national calendar. During elections, candidates increasingly use social media platforms to engage voters. Using the 2016 US presidential election as a case study, we looked at the use of Twitter by political campaigns and examined how the drivers of voter behaviour were reflected in Twitter. Social media analytics have been used to derive insights related to theoretical frameworks within political science. Using social media analytics, we investigated whether the nature of social media discussions have an impact on voting behaviour during an election, through acculturation of ideologies and polarization of voter preferences. Our findings indicate that discussions on Twitter could have polarized users significantly. Reasons behind such polarization were explored using Newman and Sheth's model of voter's choice behaviour. Geographical analysis of tweets, users, and campaigns suggests acculturation of ideologies among voting groups. Finally, network analysis among voters indicates that polarization may have occurred due to differences between the respective online campaigns. This study thus provides important and highly relevant insights into voter behaviour for the future management and governance of successful political campaigns.","Acculturation in social media; eParticipation; Hashtag community; Polarization in elections; Public policy; Social media; Twitter analytics","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-15","","","Information and Communication Technology","","",""
"uuid:d6b5a159-82b1-4fa5-bd3d-8e5415536536","http://resolver.tudelft.nl/uuid:d6b5a159-82b1-4fa5-bd3d-8e5415536536","Towards generalized process patterns for detecting corruption within the government using open data","Darusalam, D. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Ubacht, J. (TU Delft Information and Communication Technology)","","2018","Governments are seeking for new ways to fight corruption within their own administration. The opening of data has the potential to involve citizens in detecting corruption by providing them the ability to view and analyze data about what is happening within the government. However, how open data can be used to detect corruption is not clear. In this paper general patterns for detecting corruption using open data are derived. The patterns are derived by analyzing a case study of e-Procurement at the local government level in Indonesia. E-procurement activities and the corresponding audit activities were analyzed. The following patterns for detecting corruption using open data were derived; 1) storing and opening documents, 2) cross-data comparison, 3) four-eyes-principles, 4) segregation of duties, 5) authorization, and 6) publishing application controls. Data about the activities and structure of the administrative processes should be opened to allow the public to scrutinize whether the process has implemented preventive and detective controls following the process patterns derived in this research. Furthermore, data should be opened about all phases of the administrative processes to enable the involvement of the public and use their 'many eyes' for detecting corruption.","Citizen participation; Corruption; E-Government; E-Procurement; Internal control; Open data; Patterns; Process patterns","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-12-01","","","Information and Communication Technology","","",""
"uuid:b53d5462-fa6d-4ceb-a7bf-28115b688651","http://resolver.tudelft.nl/uuid:b53d5462-fa6d-4ceb-a7bf-28115b688651","Gaming to improve public policies by engaging local governments in open data policy-making","Kleiman, F. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","Open government is a trend of public administration that strengthens the relationship between governments and the public. In open government, the opening of data is the mean to make governmental information accessible for citizens, firms, NGO's and other public bodies. However, one of the challenges is still to get national and local governments to open their data for use. There exist already national governmental policies for open data and research has been developed to support policies and to understand its effects. Opening by default requires that politicians and public servants change their behaviour towards the opening of data. The objective of the present research is to present how games can be used to change the behaviour of local government's civil servants towards providing and using open data to improve the public policies with which they work (overcome cultural resistance against opening data). Therefore, the engagement of civil servants in open data usage will be experimented through games with various interactions forms. Evaluation of what works (and what does not work) will be registered to produce new inputs on how to use gaming exercises on public policies in general and for local Open Data Policies specifically.","Decision-Making; Open Data Policy; Policy Gaming","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:343abe9f-25e0-491d-8bc9-80f977411c76","http://resolver.tudelft.nl/uuid:343abe9f-25e0-491d-8bc9-80f977411c76","Challenges of blockchain technology adoption for e-government: A systematic literature review","Batubara, F.R. (TU Delft Information and Communication Technology); Ubacht, J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","The ability of blockchain technology to record transactions on distributed ledgers offers new opportunities for governments to improve transparency, prevent fraud, and establish trust in the public sector. However, blockchain adoption and use in the context of e-Government is rather unexplored in academic literature. In this paper, we systematically review relevant research to understand the current research topics, challenges and future directions regarding blockchain adoption for e-Government. The results show that the adoption of blockchain-based applications in e-Government is still very limited and there is a lack of empirical evidence. The main challenges faced in blockchain adoption are predominantly presented as technological aspects such as security, scalability and flexibility. From an organizational point of view, the issues of acceptability and the need of new governance models are presented as the main barriers to adoption. Moreover, the lack of legal and regulatory support is identified as the main environmental barrier of adoption. Based on the challenges presented in the literature, we propose future research questions that need to be addressed to inform how the public sector should approach the blockchain technology adoption.","Adoption; Blockchain; Government; Literature review; Public service","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-12-01","","","Information and Communication Technology","","",""
"uuid:f2dfd761-1612-49bd-ab65-9fa1cbfc8b86","http://resolver.tudelft.nl/uuid:f2dfd761-1612-49bd-ab65-9fa1cbfc8b86","Theory and practice of linked open statistical data","Tambouris, Efthimios (University of Macedonia); Kalampokis, Evangelos (University of Macedonia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Matheus, R. (TU Delft Information and Communication Technology); Hermans, Paul (ProXML); Kalvet, Tarmo (Tallinn University of Technology)","","2018","The number of Open Statistical Data available for reuse is rapidly increasing. Linked open data technology enables easy reuse and linking of data residing in different locations in a simple and straightforward manner. Yet, many people are not familiar with the technology standards and tools for making use of open statistical data. In this tutorial, we will introduce Linked Open Statistical Data (LOSD) and demonstrate the use of LOSD technologies and tools to visualize open data obtained from various European Countries. We will also give the participants the opportunity to use these tools thus obtaining a personal experience on their capabilities.","ICT Tools; Linked Open Data; Linked Open Statistics","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:05c15fa9-37ff-414c-8e4c-1ac4a0de36b1","http://resolver.tudelft.nl/uuid:05c15fa9-37ff-414c-8e4c-1ac4a0de36b1","How to improve policy making using open data in Virtual Research Environments? An interactive workshop discussing privacy, security and trust strategies","Yin, Y. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Van Ossenbruggen, Jacco (Centrum Wiskunde & Informatica (CWI)); Jeffery, Keith (ERCIM); Luthfi, A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","Governments and publicly-funded research institutions increasingly open up data collected and created through research. One way to share and use data obtained through research is through Virtual Research Environments (VREs). Insights obtained through open data use in VREs can subsequently provide input for policy making. However, this process involves many privacy, security and trust issues both for VRE developers and for end-users. We still know very little about what strategies can be used to handle these security, privacy and trust issues. This 1,5 hour interactive workshop aims to discuss and refine strategies for handling privacy, security and trust issues of VREs and their users as developed in the European VRE4EIC project. The workshop will facilitate open discussions making use of the interactive Mentimeter tool to involve all participants in the sharing of practices and in sharing feedback on the strategies.","E-government; Open data; Open research data; Policy-making; Privacy; Security; Trust; Virtual Research Environment; VRE","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:7d336fd2-d4c4-407c-823d-804852b341eb","http://resolver.tudelft.nl/uuid:7d336fd2-d4c4-407c-823d-804852b341eb","Thermal-Aware Synthesis of 5G Base Station Antenna Arrays: An Overview and a Sparsity-Based Approach","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Janssen, J. H. J. (NXP Semiconductors); Geurts, Marcel (NXP Semiconductors); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2018","Heat removal capabilities and radiation performances of several sparse antenna array topologies are studied for cooling enhancement in 5G millimeter-wave base station antennas. Both electromagnetic and thermal aspects are jointly considered for the first time in array layout optimization and a novel connection between layout sparsity and thermal management is presented. Two types of active electronically scanned arrays (AESA’s), based on the traditional and planar approaches, are examined. Thermal management in AESA’s is discussed, with a focus on cooling challenges at millimeter waves. Being relatively low-cost and low-profile while supporting flexible beamforming, passively cooled planar AESA’s with fanless CPU coolers are proposed, for the first time, to be used in 5G base stations. Additional cooling for such arrays is achieved by increasing the inter-element distances in the layout. Linear irregular arrays, spiral arrays, thinned arrays, circular ring arrays and heat sink antenna arrays are revisited with a critical discussion on their electromagnetic and thermal performance. The results are compared with regular and square layouts that are used as benchmarks throughout the paper.","Antenna synthesis; base station antennas; fifth generation (5G); millimeter-wave communications; passive cooling; sparse arrays","en","journal article","","","","","","green","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:a410d5ed-8bef-41e8-8140-130ded9cb8ee","http://resolver.tudelft.nl/uuid:a410d5ed-8bef-41e8-8140-130ded9cb8ee","A Process Pattern Model for Tackling and Improving Big Data Quality","Wahyudi, A. (TU Delft Information and Communication Technology); Kuk, George (Nottingham Trent University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","Data seldom create value by themselves. They need to be linked and combined from multiple sources, which can often come with variable data quality. The task of improving data quality is a recurring challenge. In this paper, we use a case study of a large telecom company to develop a generic process pattern model for improving data quality. The process pattern model is defined as a proven series of activities, aimed at improving the data quality given a certain context, a particular objective, and a specific set of initial conditions. Four different patterns are derived to deal with the variations in data quality of datasets. Instead of having to find the way to improve the quality of big data for each situation, the process model provides data users with generic patterns, which can be used as a reference model to improve big data quality.","Big data; Data processing; Data quality; Information quality; Process patterns; Reference model telecom","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:37f64553-cccb-44e5-8388-559cfda5242e","http://resolver.tudelft.nl/uuid:37f64553-cccb-44e5-8388-559cfda5242e","Investigating the attainment of open government data objectives: Is there a mismatch between objectives and results?","Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Shinde, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","The objectives of open government data initiatives range from enhancing transparency and accountability to increasing innovation and participation. However, there is a lack of knowledge of the extent to which the objectives of open government data initiatives are achieved. This article investigates the relationship between the objectives of open government data initiatives and the benefits delivered. A total of 168 survey responses concerning 156 open government data initiatives at different government levels worldwide suggest that operational and technical benefits are the benefits most often delivered, followed by economic benefits and, finally, societal benefits. Surprisingly, our study suggests that whether an open government data initiative delivers a benefit (e.g. increased openness, trust or innovation) is not significantly affected by having an objective related to the delivery of that benefit. The objectives of state- and national-level open government data initiatives are more often achieved than those of local- and regional-level open government data initiatives.","attainment; benefits; evaluation; implementation; objectives; open data; open government; open government data; open science","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:13dc01c1-c7ed-47ee-99f1-9d1cd2938cc4","http://resolver.tudelft.nl/uuid:13dc01c1-c7ed-47ee-99f1-9d1cd2938cc4","Behaviour of cyclists and pedestrians near right angled, sloped and levelled kerb types: Do risks associated to height differences of kerbs weigh up against other factors?","Janssen, Bas (Ministry of Infrastructure and the Environment); Schepers, Paul (Universiteit Utrecht); Farah, H. (TU Delft Transport and Planning); Hagenzieker, Marjan (TU Delft Transport and Planning)","","2018","To create a safer environment for bicyclists and pedestrians, the usefulness of different types of kerbs as a separation between these two modes has been questioned by both researchers and practitioners. Right angled kerbs pose risks to cyclists due to their height but are assumed to separate them well from pedestrians. Sloped and levelled kerb types are more forgiving but allow road traffic users to move onto each other’s infrastructure, creating a potential risk of collision. We examined the effects of different types of kerbs on cyclists’ and pedestrians’ behaviour. This is operationalized as a road user moving onto another traffic user’s infrastructure (i.e. crossing the kerb). A total of 14,502 bicyclists and 3,578 pedestrians at 12 different locations in Amsterdam were observed. We also examined the motives for crossing the kerb, and some smaller studies were carried out on corners and intersections and in some other Dutch cities for making comparisons. The results show that cyclists moving on the sidewalk is a relatively rare event for all kerb types and no conflicts between cyclists and pedestrians were observed. We therefore consider it unlikely that the risks of the height difference weigh up against the advantages in terms of separating cyclists and pedestrians. Thus, in the ambition of separating bicyclists from pedestrians as well as designing a ‘forgiving’ kerb to accept that people make mistakes, both the sloped and levelled kerb types come out as best practice.","Behaviour; Curbs; Cyclists; Forgivingness; Kerbs; Pedestrians; Separation","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:8e7c72f0-793c-4471-804b-f976c2733521","http://resolver.tudelft.nl/uuid:8e7c72f0-793c-4471-804b-f976c2733521","Digital transformation of business-to-government reporting: An institutional work perspective","Troshani, Indrit (University of Adelaide); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Lymer, Andy (University of Birmingham; University of South Africa); Parker, Lee D. (Royal Melbourne Institute of Technology University; University of Glasgow)","","2018","Traditional business-to-government reporting is a core remit of the accounting function but is associated with a significant administrative burden on business. This burden is a major obstacle hindering business efforts to achieve core efficiency and innovation objectives. We use the conceptual lens of institutional work to examine how traditional business-to-government reporting is abolished and how digital reporting is established to replace it in attempts to reduce administrative burden but without compromising regulation effectiveness. We adopt a comparative approach to analyse qualitative evidence from three jurisdictions, namely, Netherlands, United Kingdom, and Australia. Regulators across these jurisdictions have been both pioneers and leaders internationally to transform business-to-government reporting in multi-agency settings. Our analyses illustrate how institutional work to develop digital business-to-government reporting across the jurisdictions was shaped by international influences and local factors. We also illuminate how actor engagement issues and the intertwined and mutually reinforcing nature of a mosaic of forms of institutional work shaped the path of these transformations. The study contributes to existing research by explaining how supportive conditions and structures are brought about and made to coalesce in the regulatory business reporting space for digital reporting to become established and widely adopted by business.","Administrative burden; Digital reporting; Institutional work; XBRL","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-10","","","Information and Communication Technology","","",""
"uuid:fa157af9-4e08-4812-b826-4b34eb4249c2","http://resolver.tudelft.nl/uuid:fa157af9-4e08-4812-b826-4b34eb4249c2","Opportunities for Applications Using 5G Networks: Requirements, Challenges, and Outlook","Ding, Aaron Yi (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","The increasing demand for mobile network capacity driven by Internet of Things (IoT) applications results in the need for understanding better the potential and limitations of 5G networks. Vertical application areas like smart mobility, energy networks, industrial IoT applications, and AR/VR enhanced services all pose different requirements on the use of 5G networks. Some applications need low latency, whereas others need high bandwidth or security support. The goal of this paper is to identify the requirements and to understand the limitations for 5G driven applications. We review application areas and list the typical challenges and requirements posed on 5G networks. A main challenge will be to develop a network architecture being able to dynamically adapt to fluctuating traffic patterns and accommodating various technologies such as edge computing, blockchain based distributed ledger, software defined networking, and virtualization. To inspire future research, we reveal open problems and highlight the need for piloting with 5G applications, with tangible steps, to understand the configuration of 5G networks and the use of applications across multiple vertical industries.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-01","","","Information and Communication Technology","","",""
"uuid:9145b48c-32d9-48d7-b40e-90ef845ad610","http://resolver.tudelft.nl/uuid:9145b48c-32d9-48d7-b40e-90ef845ad610","Adaptive automation: automatically (dis)engaging automation during visually distracted driving","Cabrall, C.D.D. (TU Delft Intelligent Vehicles); Janssen, Nico (Student TU Delft); de Winter, J.C.F. (TU Delft Human-Robot Interaction)","","2018","Background
Automated driving is often proposed as a solution to human errors. However, fully automated driving has not yet reached the point where it can be implemented in real traffic. This study focused on adaptively allocating steering control either to the driver or to an automated pilot based on momentary driver distraction measured from an eye tracker.
Methods
Participants (N = 31) steered a simulated vehicle with a fixed speed, and at specific moments were required to perform a visual secondary task (i.e., changing a CD). Three conditions were tested: (1) Manual driving (Manual), in which participants steered themselves. (2) An automated backup (Backup) condition, consisting of manual steering except during periods of visual distraction, where the driver was backed up by automated steering. (3) A forced manual drive (Forced) condition, consisting of automated steering except during periods of visual distraction, where the driver was forced into manual steering. In all three conditions, the speed of the vehicle was automatically kept at 70 km/h throughout the drive.
Results
The Backup condition showed a decrease in mean and maximum absolute lateral error compared to the Manual condition. The Backup condition also showed the lowest self-reported workload ratings and yielded a higher acceptance rating than the Forced condition. The Forced condition showed a higher maximum absolute lateral error than the Backup condition.
Discussion
In conclusion, the Backup condition was well accepted, and significantly improved performance when compared to the Manual and Forced conditions. Future research could use a higher level of simulator fidelity and a higher-quality eye-tracker.
th International Conference on Digital Government Research at City University of New York (Staten Island, New York, USA). The article begins by discussing the concept of data collaboratives. Then the authors formulate research questions and topics for the research roadmap based on the panel discussions. The research roadmap poses questions across nine different topics: conceptualizing data collaboratives, value of data, matching data to problems, impact analysis, incentives, capabilities, governance, data management, and interoperability. Finally, the authors discuss how digital government research can contribute to answering some of the identified research questions.","Data Collaborative; Data Philanthropy; Data Sharing; Digital Government; Evidence Based Policy; Public Private Partnership","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-01","","","Information and Communication Technology","","",""
"uuid:f8bd8560-c503-466e-82d4-069141188061","http://resolver.tudelft.nl/uuid:f8bd8560-c503-466e-82d4-069141188061","Relating big data and data quality in financial service organizations","Wahyudi, A. (TU Delft Information and Communication Technology); Farhani, Adiska (Student TU Delft); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Mäntymäki, Matti (editor); Al-Sharhan, Salah A. (editor); Simintiras, Antonis C. (editor); Tahat, Luay (editor); Moughrabi, Issam (editor); Ali, Taher M. (editor); Janssen, Marijn (editor); Dwivedi, Yogesh K. (editor); Rana, Nripendra P. (editor)","2018","Today’s financial service organizations have a data deluge. A number of V’s are often used to characterize big data, whereas traditional data quality is characterized by a number of dimensions. Our objective is to investigate the complex relationship between big data and data quality. We do this by comparing the big data characteristics with data quality dimensions. Data quality has been researched for decades and there are well-defined dimensions which were adopted, whereas big data characteristics represented by eleven V’s were used to characterize big data. Literature review and ten cases in financial service organizations were invested to analyze the relationship between data quality and big data. Whereas the big data characteristics and data quality have been viewed as separated domain ours findings show that these domains are intertwined and closely related. Findings from this study suggest that variety is the most dominant big data characteristic relating with most data quality dimensions, such as accuracy, objectivity, believability, understandability, interpretability, consistent representation, accessibility, ease of operations, relevance, completeness, timeliness, and value-added. Not surprisingly, the most dominant data quality dimension is value-added which relates with variety, validity, visibility, and vast resources. The most mentioned pair of big data characteristic and data quality dimension is Velocity-Timeliness. Our findings suggest that term ‘big data’ is misleading as that mostly volume (‘big’) was not an issue and variety, validity and veracity were found to be more important.","11Â V; Big data; Data quality; Finance service organization; Value; Variety","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-04-12","","","Information and Communication Technology","","",""
"uuid:4bda1d0e-7caa-427d-91da-9dd9e0c5a18e","http://resolver.tudelft.nl/uuid:4bda1d0e-7caa-427d-91da-9dd9e0c5a18e","A fuzzy multi-criteria decision making approach for analyzing the risks and benefits of opening data","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Rehena, Z. (TU Delft Information and Communication Technology; Aliah University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven)","","2018","Governments are releasing their data to the public to accomplish benefits like the creation of transparency, accountability, citizen engagement and to enable business innovation. At the same time, decision-makers are reluctant to open their data due to some potential risks like misuse, sensitivity, ownership, and inaccuracy of the data. The goal of the study presented in this paper is to develop a Fuzzy Multi-Criteria Decision Making (FMCDM) approach to analyze the risks and benefits to determine the decision to open a dataset. FMCDM is chosen due to its capability to measure and weight the relative importance of the criteria. FMCDM need the weighting of criteria as input. For this Fuzzy Analytical Hierarchy Process (FAHP) is utilized by collecting input from experts’ knowledge and expertise. The scores for each criterion are summed up to rank the importance of the alternatives. Four main criteria are used, e.g. data sensitivity and data ownership representing risks criteria, and data availability and data trustworthy as benefits criteria. For each criterion, there were two sub-criteria identified. Four types of decisions to open data can be made: completely open, maintain suppression, provide limited access, and remain closed. A health patient record dataset is used to illustrate the approach. In further research, we recommend to develop automated approaches that take a dataset as an input and can provide an advice.","Analytic hierarchy process; Benefits; Fuzzy; Multi-criteria decision making; Open data; Risks","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-04-12","","","Information and Communication Technology","","",""
"uuid:79b3d5ff-3ab5-41f0-a8d1-e0c452f9742e","http://resolver.tudelft.nl/uuid:79b3d5ff-3ab5-41f0-a8d1-e0c452f9742e","Open data infrastructures","Charalabidis, Yannis (University of the Aegean); Alexopoulos, Charalampos (University of the Aegean); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Lampoltshammer, Thomas (Danube University Krems); Ferro, Enrico (Istituto Superiore Mario Boella)","","2018","Data represents a key asset in virtually any aspect of society and economy. Open Data in particular represents a source of immense value, as social capital (Lampoltshammer & Scholz, 2017) as well as an asset for business cases. Governments and their public administrations are generating and collecting during their service a plethora of different kinds of data, as well as an enormous amount in terms of volume. To tab into the potential this data holds in terms of stimulating economy, as well as the development and enhancement of governmental service for the benefit of the public (see Fig. 6.1), a sophisticate Open Data Infrastructure is required.","","en","book chapter","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-22","","","Information and Communication Technology","","",""
"uuid:a4f9557b-9264-4c9c-a800-91adeed8cdbb","http://resolver.tudelft.nl/uuid:a4f9557b-9264-4c9c-a800-91adeed8cdbb","Multiscale and multidimensional segregation of non-Western: migrants in seven European capitals","Petrović, A. (TU Delft OLD Urban Renewal and Housing); van Ham, M. (TU Delft OLD Urban Renewal and Housing); Janssen, H.J. (TU Delft OLD Urban Renewal and Housing); Manley, D.J. (University of Bristol); Tammaru, T. (University of Tartu)","Tintori, Guido (editor); Alessandrini, Alfredo (editor); Natale, Fabrizio (editor)","2018","The project investigated ethnic segregation in seven European capitals, namely Amsterdam, Berlin, Lisbon, London, Madrid, Paris, and Rome. These cities present a mix of immigration and welfare contexts in Europe. The study looked at the levels of ethnic segregation in each city and how these levels vary between them, how segregation manifests itself at different geographical scales and how it varies between the cities, and whether segregation varies between metropolitan cores and hinterlands.","","en","book chapter","Publications Office of the European Union","","","","","","","","","","OLD Urban Renewal and Housing","","",""
"uuid:f1dffc59-3168-47ca-b0bb-2d995857bc57","http://resolver.tudelft.nl/uuid:f1dffc59-3168-47ca-b0bb-2d995857bc57","A Unified Smart City Model (USCM) for Smart City conceptualization and benchmarking","Anthopoulos, Leonidas; Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth (Brunel University)","","2018","Smart cities have attracted an extensive and emerging interest from both science and industry with an increasing number of international examples emerging from all over the world. However, despite the significant role that smart cities can play to deal with recent urban challenges, the concept has been being criticized for not being able to realize its potential and for being a vendor hype. This paper reviews different conceptualization, benchmarks and evaluations of the smart city concept. Eight different classes of smart city conceptualization models have been discovered, which structure the unified conceptualization model and concern smart city facilities (i.e., energy, water, IoT etc.), services (i.e., health, education etc.), governance, planning and management, architecture, data and people. Benchmarking though is still ambiguous and different perspectives are followed by the researchers that measure -and recently monitor- various factors, which somehow exceed typical technological or urban characteristics. This can be attributed to the broadness of the smart city concept. This paper sheds light to parameters that can be measured and controlled in an attempt to improve smart city potential and leaves space for corresponding future research. More specifically, smart city progress, local capacity, vulnerabilities for resilience and policy impact are only some of the variants that scholars pay attention to measure and control.","","en","book chapter","IGI Global","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-06-01","","","Information and Communication Technology","","",""
"uuid:ec089ffb-3d36-47fc-85a5-95bbdb3a4ebc","http://resolver.tudelft.nl/uuid:ec089ffb-3d36-47fc-85a5-95bbdb3a4ebc","Data science empowering the public: Data-driven dashboards for transparent and accountable decision-making in smart cities","Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Maheshwari, D. (TU Delft Information and Communication Technology)","","2018","Dashboards visualize a consolidated set data for a certain purpose which enables users to see what is happening and to initiate actions. Dashboards can be used by governments to support their decision-making and policy processes or to communicate and interact with the public. The objective of this paper is to understand and to support the design of dashboards for creating transparency and accountability. Two smart city cases are investigated showing that dashboards can improve transparency and accountability, however, realizing these benefits was cumbersome and encountered various risks and challenges. Challenges include insufficient data quality, lack of understanding of data, poor analysis, wrong interpretation, confusion about the outcomes, and imposing a pre-defined view. These challenges can easily result in misconceptions, wrong decision-making, creating a blurred picture resulting in less transparency and accountability, and ultimately in even less trust in the government. Principles guiding the design of dashboards are presented. Dashboards need to be complemented by mechanisms supporting citizens' engagement, data interpretation, governance and institutional arrangements.","Accountability; Big data; Dashboards; Data science; Decision-making; Design principles; E-government; Open data; Open government; Policy-making; Smart City; Transparency; Trust","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:a1ae1989-d4d0-44de-983b-88442e0d5114","http://resolver.tudelft.nl/uuid:a1ae1989-d4d0-44de-983b-88442e0d5114","Regulatory compliance and over-compliant information sharing – Changes in the B2G landscape","Klievink, A.J. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); van der Voort, H.G. (TU Delft Organisation & Governance); van Engelenburg, S.H. (TU Delft Information and Communication Technology)","","2018","Business-to-government information exchange has over the past decades greatly benefited from data exchange standards and inter-organisational systems. The data era enables a new shift in the type of information sharing; from formal reporting to opening up full (and big) data sets. This enables new analytics and insights by government, more effective and efficient compliance assessment, and other uses. The emphasis here shifts from establishing formats to deciding what information can be shared, under what conditions, and how to create added value. There are numerous initiatives that explore how to put data to better use for businesses, for government and for their interactions. However, there is limited attention to exactly how these new forms of extensive data sharing affects the supervision relationships. In this paper, we exploratively look across three research projects to identify the implications of information sharing beyond the regulatory requirements (‘over-compliant’). We find that the lack of attention to those implications lead to solutions that are hard to scale up and present unexpected consequences down the line, which may negatively impact the future willingness to explore new potential added value of data sharing.","B2G; Business-to-government; Information sharing; Regulatory compliance; Supervision","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-02-02","","","Organisation & Governance","","",""
"uuid:20629d24-9b0c-4012-a8b0-57cf7540c355","http://resolver.tudelft.nl/uuid:20629d24-9b0c-4012-a8b0-57cf7540c355","Preface: IFIP EGOV-CeDEM-ePart2018","Parycek, Peter (Danube University Krems); Glassey, Olivier (University of Lausanne); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Scholl, Hans Jochen (University of Washington); Tambouris, Efthimios (University of Macedonia); Kalampokis, Evangelos (University of Macedonia); Virkar, Shefali (Danube University Krems)","","2018","","","en","contribution to periodical","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:e530fd90-7b83-4fe8-b13f-7704215af483","http://resolver.tudelft.nl/uuid:e530fd90-7b83-4fe8-b13f-7704215af483","Exploring the Tiers of Rooted Phylogenetic Network Space Using Tail Moves","Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Erdős, Péter L. (MTA Rényi Institute of Mathematics); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Scornavacca, Celine (Université de Montpellier)","","2018","Popular methods for exploring the space of rooted phylogenetic trees use rearrangement moves such as rooted Nearest Neighbour Interchange (rNNI) and rooted Subtree Prune and Regraft (rSPR). Recently, these moves were generalized to rooted phylogenetic networks, which are a more suitable representation of reticulate evolutionary histories, and it was shown that any two rooted phylogenetic networks of the same complexity are connected by a sequence of either rSPR or rNNI moves. Here, we show that this is possible using only tail moves, which are a restricted version of rSPR moves on networks that are more closely related to rSPR moves on trees. The connectedness still holds even when we restrict to distance-1 tail moves (a localized version of tail moves). Moreover, we give bounds on the number of (distance-1) tail moves necessary to turn one network into another, which in turn yield new bounds for rSPR, rNNI and SPR (i.e. the equivalent of rSPR on unrooted networks). The upper bounds are constructive, meaning that we can actually find a sequence with at most this length for any pair of networks. Finally, we show that finding a shortest sequence of tail or rSPR moves is NP-hard.","Diameter; Head-move operation; Network space; Phylogenetic network; Rearrangement; Tail-move operation","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:c22074f4-baac-433a-9d14-3844c59ad717","http://resolver.tudelft.nl/uuid:c22074f4-baac-433a-9d14-3844c59ad717","Three Categories of Context-Aware Systems","Shishkov, Boris (Bulgarian Academy of Sciences; Interdisciplinary Institute for Collaboration and Research on Enterprise Systems and Technology (IICREST)); Larsen, John Bruntse (Technical University of Denmark); Warnier, Martijn (TU Delft System Engineering); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","With regard to context-aware systems: some optimize system-internal processes, based on the context state at hand; others maximize the user-perceived effectiveness of delivered services, by providing different service variants depending on the situation of the user; still others are about offering value-sensitivity when the society demands so. Even though those three perspectives cover a broad range of currently relevant applications there are no widely accepted and commonly used corresponding concepts and terms. This is an obstacle to broadly understand, effectively integrate, and adequately assess such systems. We address this problem, by considering a (component-based) methodological derivation of technical (software) specifications based on underlying enterprise models. That is because context states are about the enterprise environment of a (software) system while the delivery of context-aware services is about technical (software) functionalities; hence, we need a perspective on both. We consider the SDBC (Software Derived from Business Components) approach that brings together enterprise modeling and software specification. On that basis: (a) We deliver a base context-awareness conceptualization; (b) We partially align it to agent technology because adapting behaviors to environments assumes some kind of pro-activity that is only fully covered by agent systems, in our view. We partially illustrate our proposed conceptualization and particularly - the agent technology implications, by means of a case example featuring land border security.","AORTA; Context-awareness; Modeling; SDBC; System design","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Information and Communication Technology","","",""
"uuid:8dee941d-9be4-4d45-a919-43e403c47a2e","http://resolver.tudelft.nl/uuid:8dee941d-9be4-4d45-a919-43e403c47a2e","Composite Public Values and Software Specifications","Garvanova, Magdalena (University of Library Studies and Information Technologies); Shishkov, Boris (Bulgarian Academy of Sciences; Interdisciplinary Institute for Collaboration and Research on Enterprise Systems and Technology (IICREST)); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2018","Public values are desires of the general public, that are about properties considered societally valuable, such as respecting the privacy of citizens or prohibiting polluting activities. “Translating” public values into functional solutions is thus an actual challenge. Even though Value-Sensitive Design (VSD) is about weaving public values in the design of (technical) systems, it stays insufficiently concrete as it concerns the alignment between abstract public values and technical (software) solutions. Still, VSD indirectly inspires ideas in that direction as for example the idea to consider business process variants for achieving such an alignment. Nevertheless, this is all about “atomic” public values (encapsulating only one particular behavioral goal) while one would often face public values that are “composite” in the sense that they reflect a particular human attitude rather than just a desired behavioral goal. In the current paper, we propose a value decomposition approach that allows for operationalizing composite public values. We also present experimental results featuring data analytics using self-administrated surveys.","Data analytics; Public values; Software specification","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Information and Communication Technology","","",""
"uuid:ee4138d1-77b0-4836-bb7f-27ef03acc17a","http://resolver.tudelft.nl/uuid:ee4138d1-77b0-4836-bb7f-27ef03acc17a","Serious gaming for developing open government data policies by local governments","Kleiman, F. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Meijer, S.A. (TU Delft Organisation & Governance; KTH Royal Institute of Technology)","","2018","Developing open government by local government is cumbersome. Many local governments have no policies or are struggling to develop policies enabling to create value from open data. Policy-making is challenging due to the wicked nature of many policy problems, unclear objectives, and the involvement of diverse stakeholders. At the same time governments are opening their policy-making processes for participation by citizens and private companies. The goal of this paper is to present the structure of a game to increase the understanding of open-data policies by local governments. Open Data Policies are aimed at making public data available to be accessed and used by civil society. The game participants can experience the implications of various policies. This should help them to developed better policies.","Decision-Making; Open Data Policy; Policy Gaming","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:da253c1d-f3c7-4f1a-a9c1-23632266df6d","http://resolver.tudelft.nl/uuid:da253c1d-f3c7-4f1a-a9c1-23632266df6d","Open data directives and policies","Charalabidis, Yannis (University of the Aegean); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Alexopoulos, Charalampos (University of the Aegean); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Lampoltshammer, Thomas (Danube University Krems); Ferro, Enrico (Istituto Superiore Mario Boella)","","2018","In developing open data policies, organizations aim to stimulate and guide the publication and use of data and to gain advantages from this. Often open data policies are guided by a high-level directive, such as those of the United States (Obama, 2009b) and the European Commission (European Commission, 2013c). Open data policies are important, as their purpose is often to ensure the long-term availability of government information to create transparency and thereby to contribute to citizens’ rights to public access to government information. This right is considered a fundamental tenet of democracy (Allen, 1992). Moreover, open data policies have the potential to increase the participation, interaction, self-empowerment and social inclusion of open data users (e.g. citizens) and providers alike, stimulating economic growth and innovation and realizing many other advantages.","","en","book chapter","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-22","","","Information and Communication Technology","","",""
"uuid:5c7f1101-4c71-4152-8ecf-ab149a22831a","http://resolver.tudelft.nl/uuid:5c7f1101-4c71-4152-8ecf-ab149a22831a","The multiple life cycles of open data creation and use","Charalabidis, Yannis (University of the Aegean); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Alexopoulos, Charalampos (University of the Aegean); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Lampoltshammer, Thomas (Danube University Krems); Ferro, Enrico (Istituto Superiore Mario Boella)","","2018","Open data can be defined as data that is free of charge or provided at marginal cost, under an open licence, machine readable, and provided in an open format","","en","book chapter","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-03-22","","","Information and Communication Technology","","",""
"uuid:9c018fa0-7e8e-4d1a-8a8e-3fbdf6ef4318","http://resolver.tudelft.nl/uuid:9c018fa0-7e8e-4d1a-8a8e-3fbdf6ef4318","Technical Vocational Education and Training: the ‘dark continent’ in OER","Schuwer, Robert (Fontys University of Applied Sciences); Janssen, Ben (Fontys University of Applied Sciences)","","2018","","Research; Adoption of OER; UNESCO SDG 4; Technical Vocational Education and Training","en","conference paper","","","","","","","","","","","","","",""
"uuid:fe4d93cd-7370-4433-b96c-585c2688627a","http://resolver.tudelft.nl/uuid:fe4d93cd-7370-4433-b96c-585c2688627a","A priori TSP in the scenario model","van Ee, Martijn (Vrije Universiteit Amsterdam); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, T.M.L. (TU Delft Discrete Mathematics and Optimization); Sitters, René (Vrije Universiteit Amsterdam; Centrum Wiskunde & Informatica (CWI))","","2018","In this paper, we consider the a priori traveling salesman problem in the scenario model. In this problem, we are given a list of subsets of the vertices, called scenarios, along with a probability for each scenario. Given a tour on all vertices, the resulting tour for a given scenario is obtained by restricting the solution to the vertices of the scenario. The goal is to find a tour on all vertices that minimizes the expected length of the resulting restricted tour. We show that this problem is already NP-hard and APX-hard when all scenarios have size four. On the positive side, we show that there exists a constant-factor approximation algorithm in three restricted cases: if the number of scenarios is fixed, if the number of missing vertices per scenario is bounded by a constant, and if the scenarios are nested. Finally, we discuss an elegant relation with an a priori minimum spanning tree problem.","a priori optimization; Master tour; Optimization under scenarios; Traveling salesman problem","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-02-16","","","Discrete Mathematics and Optimization","","",""
"uuid:b45e27c1-2f2c-49b5-9bc9-8f611a41658b","http://resolver.tudelft.nl/uuid:b45e27c1-2f2c-49b5-9bc9-8f611a41658b","Analyzing airport security checkpoint performance using cognitive agent models","Knol, Arthur (Student TU Delft); Sharpanskykh, Alexei (TU Delft Air Transport & Operations); Janssen, S.A.M. (TU Delft Air Transport & Operations)","","2019","Modern airports operate under high demands and pressures, and strive to satisfy many diverse, interrelated, sometimes conflicting performance goals. Airport performance areas, such as security, safety, and efficiency are usually studied separately from each other. However, operational decisions made by airport managers often impact several areas simultaneously. Current knowledge on how different performance areas are related to each other is limited. This paper contributes to filling this gap by identifying and quantifying relations and trade-offs between the detection performance of illegal items and the average queuing time at airport security checkpoints. These relations and trade-offs were analyzed by simulations with a cognitive agent model of airport security checkpoint operations. By simulation analysis a security checkpoint performance curve with three different regions was identified. Furthermore, the importance of focus on accuracy for a security operator is shown. The results of the simulation studies were related to empirical research at an existing regional airport.","Agent-based modelling and simulation; Airport performance metrics; Airport security operations; Sociotechnical system modelling; Trade-off relations","en","journal article","","","","","","","","2020-12-01","","","Air Transport & Operations","","",""
"uuid:d865e4ae-b102-47b6-98fa-5bac1a6fdf33","http://resolver.tudelft.nl/uuid:d865e4ae-b102-47b6-98fa-5bac1a6fdf33","Agent-based modelling and analysis of security and efficiency in airport terminals","Janssen, S.A.M. (TU Delft Air Transport & Operations); Sharpanskykh, Alexei (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2019","Both security and efficiency are important performance areas of air transport systems. Several methods have been proposed to assess security risks and estimate efficiency independently, but only few of these methods identify relationships between security risks and efficiency performance indicators. To analyze security, efficiency, and the relationships relations between them, an agent-based methodology was proposed in this work. This methodology combines an agent-based security risk assessment approach with agent-based efficiency estimation. The methodology was applied to a case study that analyzes security regarding an Improvised Explosive Device (IED) attack, different commonly used efficiency performance indicators in the aviation domain, such as queuing time for passengers, and the relationships between them. Results showed that reducing security risks and improving efficiency were not always conflicting objectives. Reducing the number of passengers before the security checkpoint was found to be an effective measure to reduce security risks and improve efficiency aspects. Furthermore, results showed that airports should attempt to spread passengers across the available space as much as possible to reduce the impact of an IED attack.","Agent-based modelling; Airport terminal; Efficiency; Improvised Explosive Device; Security risk management","en","journal article","","","","","","","","2021-01-23","","","Air Transport & Operations","","",""
"uuid:b1ccf950-edee-4404-91cf-1e048fbde7a2","http://resolver.tudelft.nl/uuid:b1ccf950-edee-4404-91cf-1e048fbde7a2","Internet and political empowerment: Towards a taxonomy for online political empowerment","Pirannejad, A. (TU Delft Information and Communication Technology; University of Tehran); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","In the age of the information revolution, the Internet can be used to involve citizens in political processes and leads to the emergence of the new version of political empowerment. This article analyses the possible effects of the Internet on the political empowerment of citizens. We interviewed 29 citizens of Tehran to learn how the Internet affects their political involvement, and to determine whether it results in their political empowerment. We analysed the interview transcripts using Strauss and Corbin’s open-coding scheme, revealing 44 constructs. These were refined and categorised into two aspects: ‘political awareness’ and ‘political participation’. This taxonomy can be employed to evaluate the use of the Internet for political empowerment and to develop the ways to empower citizens. Six main findings on the effect of factors which contribute to the political empowerment of citizens were developed. The question of which factors are essential for citizen empowerment is likely to be context-specific and is recommended as the topic of future research.","citizens; democracy; e-participation; Internet; Iran; narrative inquiry; political empowerment","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:955d9b50-c67f-4186-bab0-957ae7a87f6c","http://resolver.tudelft.nl/uuid:955d9b50-c67f-4186-bab0-957ae7a87f6c","Next Generation Data Infrastructures: Towards an Extendable Model of the Asset Management Data Infrastructure as Complex Adaptive System","Brous, P.A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Herder, P.M. (TU Delft Energie and Industrie)","","2019","Organizations are increasingly looking to adopt the Internet of Things (IoT) to collect the data required for data-driven decision-making. IoT might yield many benefits for asset management organizations engaged in infrastructure asset management, yet not all organizations are equipped to handle this data. IoT data is collected, stored, and analyzed within data infrastructures and there are many changes over time, resulting in the evolution of the data infrastructure and the need to view data infrastructures as complex adaptive systems (CAS). Such data infrastructures represent information about physical reality, in this case about the underlying physical infrastructure. Physical infrastructures are often described and analyzed in literature as CASs, but their underlying data infrastructures are not yet systematically analyzed, whereas they can also be viewed as CAS. Current asset management data models tend to view the system from a static perspective, posing constraints on the extensibility of the system, and making it difficult to adopt new data sources such as IoT. The objective of the research is therefore to develop an extensible model of asset management data infrastructures which helps organizations implement data infrastructures which are capable of evolution and aids the successful adoption of IoT. Systematic literature review and an IoT case study in the infrastructure management domain are used as research methods. By adopting a CAS lens in the design, the resulting data infrastructure is extendable to deal with evolution of asset management data infrastructures in the face of new technologies and new requirements and to steadily exhibit new forms of emergent behavior. This paper concludes that asset management data infrastructures are inherently multilevel, consisting of subsystems, links, and nodes, all of which are interdependent in several ways.","","en","review","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:a8409a8f-e4e7-436e-8540-7020b26c7547","http://resolver.tudelft.nl/uuid:a8409a8f-e4e7-436e-8540-7020b26c7547","Perceived usefulness, ease of use and user acceptance of blockchain technology for digital transactions–insights from user-generated content on Twitter","Grover, Purva (Indian Institute of Technology Delhi); Kar, Arpan Kumar (Indian Institute of Technology Delhi); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Ilavarasan, P. Vigneswara (Indian Institute of Technology Delhi)","","2019","Although blockchain has attracted a great deal of attention from academia and industry there is a lack of studies on acceptance drivers. This study explores blockchain acceptance by mining the collective intelligence of users on Twitter. It maps blockchain user acceptance drivers to technology acceptance constructs. The analysis shows that users are attracted by security, privacy, transparency, trust and traceability aspects provided by blockchain. On Twitter more discussions on blockchain benefits than on drawbacks. Initial coin offering (ICO) is extensively discussed. The study provides guidelines for managers and concludes by presenting the limitations of the study along with future research directions.","acceptance; Blockchain; collective intelligence; Initial coin offering; smart contracts; social media analytics; technology adoption; user generated content","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-04-04","","","Information and Communication Technology","","",""
"uuid:2ee8c1dd-4b52-4183-9bd9-1b6399163e3d","http://resolver.tudelft.nl/uuid:2ee8c1dd-4b52-4183-9bd9-1b6399163e3d","Commoditization and IT Product Innovation Strategies from an IT Firm Perspective","Bronkhorst, Jeroen (Hewlett-Packard Enterprise); Schaveling, Jaap (Nyenrode Business Universiteit); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","Based on a survey (N = 248 business managers) this study confirms that different types of innovation in IT products have a direct positive impact on IT firms’ business performance. The commoditization level of IT markets acts as a moderator dampening this positive relationship. This implies that IT firms should take existing commoditization levels as well as a mix of IT product innovation types into account as part of their innovation strategy.","business performance; commoditization; information technology; Innovation; innovation strategies; IT industry","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-10-03","","","Information and Communication Technology","","",""
"uuid:12e19cc1-a0d7-405b-aa99-ed514015f017","http://resolver.tudelft.nl/uuid:12e19cc1-a0d7-405b-aa99-ed514015f017","5th AW4CITY 2019 chairs' welcome","Anthopoulos, Leonidas (University of Thessaly); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth (Bradford University)","","2019","","","en","conference paper","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-12-01","","","Information and Communication Technology","","",""
"uuid:580c3e65-7b77-4df6-bef1-d2c645031e21","http://resolver.tudelft.nl/uuid:580c3e65-7b77-4df6-bef1-d2c645031e21","Moving beyond Smart Cities: Digital Nations for Social Innovation & Sustainability","Kar, Arpan Kumar (Indian Institute of Technology Delhi); Ilavarasan, Vigneswara (Indian Institute of Technology Delhi); Gupta, M. P. (Indian Institute of Technology Delhi); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Kothari, Ravi (Ashoka University)","","2019","The next step after smart cities is the creation of digital or smart nations. A digital nation requires a national transformation across diverse institutions including the urban and rural areas of a society. Besides diverse social innovation initiatives, sustainability is a key aspect, so that rather than greenfield projects, long-term solutions will involve brownfield, smart city projects. A digital transformation to a digital or smart nation requires a great deal of innovation in planning, process re-engineering and execution. Whereas research work and policy actions are traditionally focused on a city level, these efforts need to be widened to the national level. Existing city-scale theories and frameworks may be used and adapted to meet the larger-scale needs of the future smart nations. The new issues and research challenges which arise need to be addressed through interdisciplinary approaches. This special issue on the theme of digital nations attempts to address the need in the academic literature to provide a better understanding of digital nations.","Digital nations; Implementation barriers; Information and communication technology; Innovation; Smart cities; Smart nations; Sustainability; Technology adoption; Technology impact","en","contribution to periodical","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-12-01","","","Information and Communication Technology","","",""
"uuid:03f6369a-2129-4dd4-bd8f-6eb58f408924","http://resolver.tudelft.nl/uuid:03f6369a-2129-4dd4-bd8f-6eb58f408924","A Micro-Scale Approach to Ethnic Minority Concentration in the Residential Environment and Voting for the Radical Right in The Netherlands","Janssen, H.J. (TU Delft OLD Urban Renewal and Housing); van Ham, M. (TU Delft OLD Urban Renewal and Housing; University of St Andrews); Kleinepier, T. (TU Delft OLD Urban Renewal and Housing); Nieuwenhuis, J.G. (TU Delft OLD Urban Renewal and Housing)","","2019","Existing empirical research on the link between ethnic minority concentration in residential environments and voting for the radical right is inconclusive, mainly due to major differences between studies in the spatial scale at which minority concentration is measured. We examined whether the presence of non-western ethnic minorities in the residential environment, measured at four spatial scales, is related to individuals’ intention to vote for the Dutch Party for Freedom (Dutch acronym PVV). We combined individual level survey data and register data, and we used multi-level structural equation models to examine possible mediation by anti-immigrant attitudes and political dissatisfaction. The models show different effects at different scales. At the micro scale (100 by 100 meter grids) we find a curvilinear effect: individuals with 30–50 per cent non-western minorities in their direct living environment are most likely to report to vote for the PVV. At higher spatial scales (up to municipal level) we find that the higher the proportion of non-western minorities, the more likely individuals are to report to vote for the PVV. These effects can however not be explained by anti-immigrant attitudes or political dissatisfaction. We even find that at the micro scale the presence of non-western minorities is related to less anti-immigrant attitudes.","","en","journal article","","","","","","","","","","","OLD Urban Renewal and Housing","","",""
"uuid:1bafaa9b-a488-4567-81fb-5bcb798e9b9d","http://resolver.tudelft.nl/uuid:1bafaa9b-a488-4567-81fb-5bcb798e9b9d","The dual effects of the Internet of Things (IoT): A systematic review of the benefits and risks of IoT adoption by organizations","Brous, P.A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Herder, P.M. (TU Delft Energie and Industrie)","","2019","The Internet of Things (IoT) might yield many benefits for organizations, but like other technology adoptions may also introduce unforeseen risks and requiring substantial organizational transformations. This paper analyzes IoT adoption by organizations, and identifies IoT benefits and risks. A Big, Open, Linked Data (BOLD) categorization of the expected benefits and risks of IoT is made by conducting a comprehensive literature study. In-depth case studies in the field of asset management were then executed to examine the actual experienced, real world benefits and risks. The duality of technology is used as our theoretical lens to understand the interactions between organization and technology. The results confirm the duality that gaining the benefits of IoT in asset management produces unexpected social changes that lead to structural transformation of the organization. IoT can provide organizations with many benefits, after having dealt with unexpected risks and making the necessary organizational changes. There is a need to introduce changes to the organization, processes and systems, to develop capabilities and ensure that IoT fits the organization's purposes.","Adoption; Asset management; Big and open linked data; Case study; Duality of technology; Internet of things; IoT; Smart cities; Structuration theory","en","review","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:0e7c6dae-c4bd-4a38-a050-0f95bcbe7b80","http://resolver.tudelft.nl/uuid:0e7c6dae-c4bd-4a38-a050-0f95bcbe7b80","Unraveling Transparency and Accountability in Blockchain","Batubara, F.R. (TU Delft Information and Communication Technology); Ubacht, J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Chen, Yu-Che (editor); Salem, Fadi (editor); Zuiderwijk, Anneke (editor)","2019","Blockchain technology is heralded for improving trust and can provide a new approach for creating transparency and promoting accountability of government activities. However, it is still not clear how and in what ways blockchain technologies can improve this. This study examines the mechanisms and capability of blockchain technology to contribute to improved transparency and
accountability in government. We use a set of system transparency and accountability concepts and mechanisms to critically assess the capabilities of blockchain . By means of a land registration case in Indonesia we investigate the effects of blockchain on the transparency and accountability of the system. Creating transparency and accountability might be more difficult than expected, as non technical issues need to be addressed. Based on our assessment we discuss key issues, including digital ID, privacy, interoperability, connectivity and technology aware population, computational efficiency and storage size, acceptability, check and control mechanism, data validity, digital signature, algorithm transparency, law and regulation support, and dispute resolution, that must be considered in developing a transparent and accountable blockchain based e-Government system.","Accountability; Blockchain; E-Government; Land registry; Transparency","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-01-01","","","Information and Communication Technology","","",""
"uuid:2df545df-a6f5-474c-8d4c-2b6faa718621","http://resolver.tudelft.nl/uuid:2df545df-a6f5-474c-8d4c-2b6faa718621","Developing Large Scale B2B Blockchain Architectures for Global Trade Lane: Are the design principles derived based on the upscaling of the Internet applicable for upscaling global blockchain-enabled infrastructures?","Tan, Y. (TU Delft Information and Communication Technology); Rukanova, B.D. (TU Delft Information and Communication Technology); van Engelenburg, S.H. (TU Delft Organisation & Governance); Ubacht, J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","Blockchain technologies offer new ways of organizing information architectures for information sharing amongst a multitude of agents in complex socio-technical systems. However, transferring the experience gained with blockchain from the crypotocurrency domain to business-to-business (B2B) setting is challenging and some of the blockchain inherent characteristics hamper pilots from scaling up towards a global blockchain-enabled information sharing business-to-business (B2B) architecture. In this paper we derive specific design principles and rules to explicitly address these blockchain scalability issues in a B2B context. To do so we analyse the evolution of the Global Trade Digitization (GTD1) blockchain architecture that is developed to share data in international supply chains all over the world by taking an information infrastructure perspective and by means of the design principles and rules of Hanseth and Lyytinen (2010) which were derived using the case of the Internet. Our longitudinal analysis represents the dynamics in the implementation of the global GTD B2B blockchain-enabled architecture. Building on the design principles of Hanseth and Lyytinen (2010) we position especially that the design principles that address the use of the installed base capabilities to offload the blockchain infrastructure, the reduction of IT capabilities to simplify its technical and social complexity, and the modularization of the blockchain-based information architecture to address separate functionalities of the information sharing process appear to be important aspects to address the scalability issues of blockchain-based applications, also in other B2B domains.","Blockchain; scalability; design principles; B2B architecture; global; digital trade infrastructures","en","conference paper","University of Surrey","","","","","","","","","","Information and Communication Technology","","",""
"uuid:4debf1a1-c9ad-4410-aade-2c5407c59d6a","http://resolver.tudelft.nl/uuid:4debf1a1-c9ad-4410-aade-2c5407c59d6a","Towards a Smart Sustainable City Roadmap Identifying Competency Gaps","Pereira, Gabriela Viale (Danube University Krems); Estevez, Elsa (Universidad Nacional de La Plata); Krimmer, Robert (Tallinn University of Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Janowski, Tomasz (Politechnika Gdanska)","Chen, Yu-Che (editor); Salem, Fadi (editor); Zuiderwijk, Anneke (editor)","2019","This workshop of the CAP4CITY (Erasmus+ Strengthening Governance Capacity for Smart Sustainable Cities) project is to promote and stimulate the discussion and networking in the area of Digital Government. Smart Sustainable Cities and related concepts of Digital, Intelligent and Smart Cities represent a progression of how cities around the world apply digital technology to serve their populations, pursue sustainable socioeconomic development, and transform themselves in the process, and require strong capacity for public governance in the digital world. In order to identify the gaps concerning missing knowledge and training needs in this area we propose to validate a Smart Sustainable Cities roadmap through a scenario-building approach.","Governance capacity; Latin America; Smart Cities; Sustainable Cities","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:b4fdf903-c763-4d63-969c-b5ebbeb49668","http://resolver.tudelft.nl/uuid:b4fdf903-c763-4d63-969c-b5ebbeb49668","Workshop on Blockchain based applications","Ubacht, J. (TU Delft Information and Communication Technology); Tan, Y. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Rukanova, B.D. (TU Delft Information and Communication Technology)","Chen, Yu-Che (editor); Salem, Fadi (editor); Zuiderwijk, Anneke (editor)","2019","The use of blockchain technology has the potential to change many core processes in society, industry, education, healthcare, business and government by introducing new ways of transacting that are expected to change the traditional ways in which organizations exchange data and money. Proponents of developing blockchain applications suggest that many benefits can be created by using blockchain, including (enhanced) trust, privacy, transparency and control. As a consequence the traditional role of the middleman in transactions processes might be substituted by blockchain based applications. Although blockchain technology was pioneered in the financial sectors by initiating cryptocurrencies, currently its use is not limited to this sector. Blockchain can be considered as a general purpose technology and as such offers a myriad of options to create blockchain applications. To date, many pilots are conducted and prototypes are developed to better understand its potential, its limitations and its transformative effect on a wide range of application domains.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:31ca320c-0e8b-460d-9dec-3831ad7b3868","http://resolver.tudelft.nl/uuid:31ca320c-0e8b-460d-9dec-3831ad7b3868","Current and expected roles and capabilities of CIOS for the innovation and adoption of new technology","Gong, Yiwei (Wuhan University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth (Bradford University)","Chen, Yu-Che (editor); Salem, Fadi (editor); Zuiderwijk, Anneke (editor)","2019","Governments across the word are under pressure to adopt new technologies and to innovate and transform their processes. Some governments have introduced the role of Chief Information Officer (CIO) to facilitate these innovations though adoption of new technologies. The traditional CIO role of improving operational efficiency is now shifting towards exploring new IT-enabled opportunities required in digital transformation. In this context, CIO capabilities are expanding to be more involved in administrative processes and digital transformation, however, their organizational role seem to lag behind. This paper is aimed at evaluating the current role of CIOs and to provide policy recommendations to strengthen their role. Data was collected during a session in which roles and capabilities of CIOs were discussed. In particular, we found that often the CIO was positioned as having an IT role, whereas a more organizational role was needed. CIOs should develop capabilities to support digital transformation and to develop architecture that is adaptive and agile. The expectations of the CIO and the role of the CIO need to be better aligned.","Adoption; Capability; CIO; Digital Transformation; Dynamic Capabilities; Enterprise Architecture; Roles","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-12-18","","","Information and Communication Technology","","",""
"uuid:0ce3dd32-03a0-44c4-9054-7339162ce864","http://resolver.tudelft.nl/uuid:0ce3dd32-03a0-44c4-9054-7339162ce864","Diffusion of blockchain technology: Insights from academic literature and social media analytics","Grover, Purva (Indian Institute of Technology Delhi); Kar, Arpan Kumar (Indian Institute of Technology Delhi); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","Purpose: Although blockchain is often discussed, its actual diffusion seems to be varying for different industries. The purpose of this paper is to explore the blockchain technology diffusion in different industries through a combination of academic literature and social media (Twitter). Design/methodology/approach: The insights derived from the academic literature and social media have been used to classify industries into five stages of the innovation-decision process, namely, knowledge, persuasion, decision, implementation and confirmation (Rogers, 1995). Findings: Blockchain is found to be diffused in almost all industries, but the level of diffusion varies. The analysis highlights that manufacturing industry is at the knowledge stage. Further public administration is at persuasion stage. Subsequently, transportation, communications, electric, gas and sanitary services and trading industry had reached to the decision stage. Then, services industries have reached to implementation stage while finance, insurance and real estate industries are the innovators of blockchain technologies and have reached the confirmation stage of innovation-decision process. Practical implications: Actual implementations of blockchain technology are still in its infancy stage for most of the industries. The findings suggest that specific industries are developing specific blockchain applications. Originality/value: To the best of the authors’ knowledge this is the first study which is using social media data for investigating the diffusion of blockchain in industries. The results show that the combination of Twitter and academic literature analysis gives better insights into diffusion than a single data source.","Blockchain; Diffusion of innovation; Social media analytics; Systematic literature review; Technology adoption","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-02-04","","","Information and Communication Technology","","",""
"uuid:8f9c6c14-2692-47e1-90d6-414ad5ea13b7","http://resolver.tudelft.nl/uuid:8f9c6c14-2692-47e1-90d6-414ad5ea13b7","Time Delay Estimation Based on Multi-band Multi-carrier Signal in Multipath Environments","Dun, H. (TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning)","","2019","The matched filter is the most common approach for time delay estimation and ranging in positioning systems. The accuracy is mainly determined by the signal bandwidth and multipath propagation condition. Instead of occupying an enormous signal bandwidth, aggregating multiple signal bands, which are transmitted either simultaneously or sequentially from the same transmitter, can still provide a very high time resolution due to its large virtual signal bandwidth. This paper discusses time delay estimation based on multiband signals, considering precision, range ambiguity and resistance to multipath. Combining carrier phases from different bands, which are physically not perturbed by a sampling frequency offset, can also mitigate the bias of time delay estimation due to the sampling frequency error. Simulation results show that using two groups of multiband signals, which are sparsely placed in the signal spectrum, can significantly improve the accuracy of time delay estimation in the presence of multipath and sampling frequency offset.","","en","conference paper","ION - Inst. of Navigation","","","","","Accepted Author Manuscript","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:ecf73eb3-42a1-4daa-a817-b8fb8c22c49c","http://resolver.tudelft.nl/uuid:ecf73eb3-42a1-4daa-a817-b8fb8c22c49c","Drie scenario’s voor de toekomst op de rails","van Wee, G.P. (TU Delft Transport and Logistics); Janssen, Marten (Universität Wien)","","2019","De komende tijd staat de organisatievraag van het spoorvervoer op de agenda. De politiek zal daarbij verschillende maatschappelijke belangen willen borgen. Een verkenning van de mogelijkheden voor het Nederlandse spoor aan de hand van drie scenario’s","","nl","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-04-11","","","Transport and Logistics","","",""
"uuid:b24eb86e-e547-4bdb-8bcb-203a13c524d8","http://resolver.tudelft.nl/uuid:b24eb86e-e547-4bdb-8bcb-203a13c524d8","Ethical hacking for boosting IoT vulnerability management: A first look into bug bounty programs and responsible disclosure","Ding, Aaron Yi (TU Delft Information and Communication Technology); De Jesus, Gianluca Limon (Student TU Delft); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Lazarov, Andon (editor); Shishkov, Boris (editor); Mitrakos, Dimitris (editor); Janssen, Marijn (editor)","2019","The security of the Internet of Things (IoT) has attracted much attention due to the growing number of IoT-oriented security incidents. IoT hardware and software security vulnerabilities are exploited affecting many companies and persons. Since the causes of vulnerabilities go beyond pure technical measures, there is a pressing demand nowadays to demystify IoT ""security complex"" and develop practical guidelines for both companies, consumers, and regulators. In this paper, we present an initial study targeting an unexplored sphere in IoT by illuminating the potential of crowdsource ethical hacking approaches for enhancing IoT vulnerability management. We focus on Bug Bounty Programs (BBP) and Responsible Disclosure (RD), which stimulate hackers to report vulnerability in exchange for monetary rewards. We carried out a qualitative investigation supported by literature survey and expert interviews to explore how BBP and RD can facilitate the practice of identifying, classifying, prioritizing, remediating, and mitigating IoT vulnerabilities in an effective and cost-efficient manner. Besides deriving tangible guidelines for IoT stakeholders, our study also sheds light on a systematic integration path to combine BBP and RD with existing security practices (e.g., penetration test) to further boost overall IoT security.","Bug Bounty Programs; Ethical Hacking; IoT Security; Responsible Disclosure; Vulnerability Management","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-03-01","","","Information and Communication Technology","","",""
"uuid:1b6a4c51-986b-46ac-b0cf-6b770fce9e02","http://resolver.tudelft.nl/uuid:1b6a4c51-986b-46ac-b0cf-6b770fce9e02","Towards a balanced E-Participation Index: Integrating government and society perspectives","Pirannejad, A. (TU Delft Information and Communication Technology; University of Tehran); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Rezaei, J. (TU Delft Transport and Logistics)","","2019","Since 2003, the United Nations has introduced the E-Participation Index (EPI), the first index to evaluate e-participation initiatives worldwide. This index has been subject to criticism for not representing the society side of e-participation initiatives. The EPI assesses e-participation initiatives on the government side only and neglects the society side, which includes all kinds of civil e-participation initiatives. In this work, the society side is included by incrementally extending the EPI with the Human Development Index and the Democracy Index. To identify the weights of the index, the best–worst method (BWM) is used while surveying 23 experts. The results show that political rights and civil liberties are viewed as the most important criteria with which to evaluate e-participation initiatives. Using this ranking, the Balanced EPI (BEPI) is created, giving weight to both the government and society sides. The new index concerns the willingness and empowerment levels of citizens so that the public can influence policy and political decision-making. Dedicated e-participation measures should be developed in further research.","Balanced e-participation index; E-participation; Government-led e-participation initiatives; Society-led e-participation initiatives","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-02-14","","","Information and Communication Technology","","",""
"uuid:72195c5d-f5cf-4f4f-826d-64fa994419f0","http://resolver.tudelft.nl/uuid:72195c5d-f5cf-4f4f-826d-64fa994419f0","Challenges for adopting and implementing IoT in smart cities: An integrated MICMAC-ISM approach","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Luthra, Sunil (State Institute of Engineering and Technology Nilokheri); Mangla, Sachin (Plymouth University); Rana, Nripendra P. (Swansea University); Dwivedi, Yogesh K. (Swansea University)","","2019","Purpose: The wider use of Internet of Things (IoT) makes it possible to create smart cities. The purpose of this paper is to identify key IoT challenges and understand the relationship between these challenges to support the development of smart cities. Design/methodology/approach: Challenges were identified using literature review, and prioritised and elaborated by experts. The contextual interactions between the identified challenges and their importance were determined using Interpretive Structural Modelling (ISM). To interrelate the identified challenges and promote IoT in the context of smart cities, the dynamics of interactions of these challenges were analysed using an integrated Matrice d’Impacts Croisés Multiplication Appliqués à un Classement (MICMAC)-ISM approach. MICMAC is a structured approach to categorise variables according to their driving power and dependence. Findings: Security and privacy, business models, data quality, scalability, complexity and governance were found to have strong driving power and so are key challenges to be addressed in sustainable cities projects. The main driving challenges are complexity and lack of IoT governance. IoT adoption and implementation should therefore focus on breaking down complexity in manageable parts, supported by a governance structure. Practical implications: This research can help smart city developers in addressing challenges in a phase-wise approach by first ensuring solid foundations and thereafter developing other aspects. Originality/value: A contribution originates from the integrated MICMAC-ISM approach. ISM is a technique used to identify contextual relationships among definite elements, whereas MICMAC facilitates the classification of challenges based on their driving and dependence power. The other contribution originates from creating an overview of challenges and theorising the contextual relationships and dependencies among the challenges.","Challenges; Internet of Things; Interpretive structural modelling; ISM; MICMAC; Smart cities","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-12-26","","","Information and Communication Technology","","",""
"uuid:96a57e13-5299-4671-ac9b-c0993997b8b3","http://resolver.tudelft.nl/uuid:96a57e13-5299-4671-ac9b-c0993997b8b3","Voorlanden voor hoogwaterbescherming","Vuik, V. (TU Delft Coastal Engineering; HKV Consultant); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk); Willemsen, Pim W.J.M. (University of Twente; NIOZ Royal Netherlands Institute for Sea Research; Deltares); Borsje, Bas W. (University of Twente); Janssen, S.K.H. (TU Delft Policy Analysis; Deltares); Hermans, L.M. (TU Delft Policy Analysis); Bouma, Tjeerd J. (Universiteit Utrecht; NIOZ Royal Netherlands Institute for Sea Research)","","2019","In Nederland zijn honderden kilometers aan waterkering toe aan versterking. De aanleg van begroeide vooroevers, zoals schorren en kwelders, is een mogelijkheid om de belasting op dijken te verminderen. Daarmee dalen overstromingsrisico’s en gaan natuurwaarden omhoog.","","nl","journal article","","","","","","Accepted Author Manuscript","","","","","Coastal Engineering","","",""
"uuid:054edc63-d998-40eb-b547-a83214b9ea73","http://resolver.tudelft.nl/uuid:054edc63-d998-40eb-b547-a83214b9ea73","Joint Ranging and Clock Synchronization for Dense Heterogeneous IoT Networks","Kazaz, T. (TU Delft Signal Processing Systems); Coutino, Mario (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); Leus, G.J.T. (TU Delft Signal Processing Systems); van der Veen, A.J. (TU Delft Signal Processing Systems)","Matthews, Michael B. (editor)","2019","Synchronization and ranging in internet of things (IoT) networks are challenging due to the narrowband nature of signals used for communication between IoT nodes. Recently, several estimators for range estimation using phase difference of arrival (PDoA) measurements of narrowband signals have been proposed. However, these estimators are based on data models which do not consider the impact of clock-skew on the range estimation. In this paper, clock-skew and range estimation are studied under a unified framework. We derive a novel and precise data model for PDoA measurements which incorporates the unknown clock-skew effects. We then formulate joint estimation of the clock-skew and range as a two-dimensional (2-D) frequency estimation problem of a single complex sinusoid. Furthermore, we propose: (i) a two-way communication protocol for collecting PDoA measurements and (ii) a weighted least squares (WLS) algorithm for joint estimation of clock-skew and range leveraging the shift invariance property of the measurement data. Finally, through numerical experiments, the performance of the proposed protocol and estimator is compared against the Cramér Rao lower bound demonstrating that the proposed estimator is asymptotically efficient.","clock synchronization; internet of things; joint estimation; localization; range; time-slotted channel hopping","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-08-21","","","Signal Processing Systems","","",""
"uuid:ab1181b8-e8c2-4d12-b08e-6506dcf31d9e","http://resolver.tudelft.nl/uuid:ab1181b8-e8c2-4d12-b08e-6506dcf31d9e","The art of scholarly reviewing: Principles and practices","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Bannister, F.E. (Trinity College Dublin)","","2019","The quality and reputation of an academic journal can depend on several factors, but high-quality peer reviews are always a core requirement. Unfortunately, reviews are not always up to the standard that they should be. Poor reviews can result in a number of problems including sub-standard articles being accepted and good manuscripts being rejected. Good reviews are comparable to good papers; they require attention and dedication to write well. Although journals are different, it is important that reviewers approach their task with goodwill, i.e. that they approach a manuscript with an open mind, read it with care and attention and make comments that are constructive and show self-reflection. Reviewers need to know the evaluation standards and the limits of their own expertise and, if in doubt, not to be afraid to say so.","","en","contribution to periodical","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-06-28","","","Information and Communication Technology","","",""
"uuid:b4f0126f-beb9-485b-b190-fba3bd27330f","http://resolver.tudelft.nl/uuid:b4f0126f-beb9-485b-b190-fba3bd27330f","Editors’ note on the refutation of “Assessing citizen adoption of e-Government initiatives in Gambia: A validation of the technology acceptance model in information systems success”","Janowski, Tomasz (Gdansk University of Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","","","en","contribution to periodical","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-09-12","","","Information and Communication Technology","","",""
"uuid:03c7f7d1-9e27-4364-b3a9-82e3abeaf06f","http://resolver.tudelft.nl/uuid:03c7f7d1-9e27-4364-b3a9-82e3abeaf06f","A Systematic Literature Study to Unravel Transparency Enabled by Open Government Data: The Window Theory","Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","The opening of data has been credited for improving transparency and for providing a window on government functioning. Although this relationship is intuitively apparent, it is in fact complex and the mere opening of data might not actually yield transparency. In this paper, a comprehensive model of determinants that enable or impede transparency enabled by open government data and the expected effects have been derived by surveying public administration and information systems literature. Public administration literature tends to be focused on factors such as participation and trust, whereas information systems literature focuses on factors such as user interface, user experience, and data quality. Digital government literature attempts to bridge these elements. The Window Theory is introduced, in order to unify existing models by integrating a broad range of factors within a single model. The Window Theory can be used to develop context-dependent models that are both comprehensive and parsimonious.","accountability; anti-corruption; digital government; disclosure; open data; open government; open government data; participation; transparency","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:3348df83-3ac5-4fdc-a129-88c934cb1b5f","http://resolver.tudelft.nl/uuid:3348df83-3ac5-4fdc-a129-88c934cb1b5f","AATOM - An Agent-based Airport Terminal Operations Model simulator","Janssen, S.A.M. (TU Delft Air Transport & Operations); Sharpanskykh, Alexei (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations); Langendoen, K.G. (TU Delft Embedded Systems)","Durak, Umut (editor)","2019","AATOM, the Agent-based Airport Terminal Operations Model simulator is open-source, agent-based at its core, and contains several calibrated presets and templates of basic airport terminal components that can readily be used. Agents in this simulator follow the AATOM architecture, an activity-based architecture for human airport agents. This allows analysis based on agent activities, such as shopping and check-in, which is of vital interest for airports. The combination of agent-based modeling and the presence of basic airport terminal components makes AATOM a unique simulator, allowing the modeler to only focus on implementation of important features of their model. The usefulness of AATOM is demonstrated by presenting case studies in the areas of airport security, gate assignment and resilience.","","en","conference paper","ACM DL","","","","","","","","","","Air Transport & Operations","","",""
"uuid:e932281d-a6d1-4a78-bfda-fcb2fd34a462","http://resolver.tudelft.nl/uuid:e932281d-a6d1-4a78-bfda-fcb2fd34a462","Governance challenges of blockchain and decentralized autonomous organizations","Rikken, O.K. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Roosenboom-Kwee, Z. (TU Delft Economics of Technology and Innovation)","","2019","The rise of blockchain has resulted in discussions on (new) governance models with multiple actors collaborating. Incidents and problems occurred due to flaws in blockchain protocols, smart contracts and Decentralized Autonomous Organizations (DAOs). Often it is unclear how decisions are made concerning evolvement of blockchain applications. In this paper, we identify and analyze potential challenges regarding governance of blockchain initiatives in various types of decentralized networks using literature and case study research. The governance challenges are classified based on a framework consisting
of different layers (infrastructure, application, company and institution/country) and stages (design, operate, evolve/crisis). The results show that in various stages and layers, different challenges occur. Furthermore, blockchain applications governance and blockchain infrastructure governance were found to be entangled adding to the challenge. Our research shows a specific need
for further research into governance models for DAO applications on permissionless blockchains, linked to the products and services offered whereas in permissioned blockchains and other type of applications, existing governance models might often be feasible. For developing new governance models, we recommend learning from the lessons from the open source community.","Blockchain; Decentralized Autonomous Organization (DAO); Governance; IT governance; Permissionless; Smart contracts","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-05-11","","","Economics of Technology and Innovation","","",""
"uuid:32234ea5-8a99-44da-bcdc-5b5926115b33","http://resolver.tudelft.nl/uuid:32234ea5-8a99-44da-bcdc-5b5926115b33","Location and context – analysis of spatial inequalities at different geographical scales.: Deliverable 5.3","Melo, Patrícia; Gaspar, José; Janssen, H.J. (TU Delft Urban Studies); van Ham, M. (TU Delft Urban Studies); Andersson, Eva (Stockholm University); Malmberg, Bo (Stockholm University)","","2019","Resituating the Local in Cohesion and Territorial Development.","","en","report","H2020 project Relocal","","","","","","","","","","Urban Studies","","",""
"uuid:6c08af98-2720-4b62-ab6c-584bb3f4af81","http://resolver.tudelft.nl/uuid:6c08af98-2720-4b62-ab6c-584bb3f4af81","Dissecting Disorder Perceptions: Neighborhood Structure and the Moderating Role of Interethnic Contact and Xenophobic Attitudes","Janssen, H.J. (TU Delft Urban Studies); Oberwittler, Dietrich (Max-Planck-Institut für ausländisches und internationales Strafrecht); Gerstner, Dominik (Max-Planck-Institut für ausländisches und internationales Strafrecht)","","2019","Although urban disorder has played a central role in neighborhood research, its impact may have been overstated in studies relying on the subjective perception of survey respondents only. Research on the “perception bias”—defined as the divergence between respondents’ subjective assessments and systematic observations of disorder—has revealed the ambiguous nature of disorder and opened a door to the analysis of the social construction of this environmental cognition. Using survey and observational data from 140 small neighborhoods in two German cities, we advance this research by focusing on the moderating role of residents’ interethnic contacts and attitudes. The results show that the effects of neighborhood minority concentration on the perception bias are conditional on the residents’ interethnic contacts and xenophobic attitudes. These findings highlight the subjectivity of disorder perceptions and caution against a naive understanding of Broken Windows theory.","Broken Windows theory; disorder; incivilities; interethnic attitudes; neighborhoods; perception bias","en","journal article","","","","","","","","","","","Urban Studies","","",""
"uuid:4dc7bd35-7c9e-4b26-ae98-4b2be8ec9610","http://resolver.tudelft.nl/uuid:4dc7bd35-7c9e-4b26-ae98-4b2be8ec9610","Handreiking Meerwaarde van Samenwerken: Een participatief instrument voor het vormen van coalities","Janssen, S.K.H. (TU Delft Policy Analysis); Hermans, L.M. (TU Delft Policy Analysis); Vreugdenhil, H.S.I. (TU Delft Policy Analysis)","","2019","Deze Handreiking presenteert het participatief instrument Meerwaarde van Samenwerken dat binnen de kaders van het Hoogwaterbeschermingsprogramma (HWBP) is toegepast in het gebied Noard-Fryslân Bûtendyks in opdracht van de POV Waddenzeedijken. Het instrument is geschikt voor alle situaties waarin (meer) samenwerken gewenst is, binnen of buiten de wereld van waterveiligheid. Samenwerking succesvol vormgeven is niet vanzelfsprekend, het is vaak nieuw, soms eng en brengt risico’s met zich mee voor planning en budget. Tegelijkertijd is samenwerken tussen HWBP, Waterschappen en Rijkswaterstaat en andere partijen een juridische verplichting en vaak onontkoombaar. Samenwerken kan winst opleveren, denk aan ‘bouwen met natuur’ oplossingen die meerdere functies bedienen. Zoeken naar de mogelijke win-win oplossingen is tevens het uitgangspunt van Meerwaarde van Samenwerken: samenwerken gaat vooral werken als het alle partijen meer oplevert dan de huidige situatie. No regret dus en rekening houdend met de belangen van de partijen. De Handreiking Meerwaarde van Samenwerken geeft een praktische richting hoe het instrument te gebruiken aan de hand van een beschrijving van de voorbereiding en vijf processtappen (Figuur 0.1.1). Na een kennismaking brengen partijen de kansen voor samenwerken in beeld, waarna iedere partij deze waardeert. Op basis van de individuele waarderingen wordt de meerwaarde van samenwerken voor de groep bepaald en bekeken hoe de meerwaarde van samenwerken kan worden bereikt. In gesprek gaan staat hierbij centraal, ondersteunt met speltheoretische analyses en concepten. Zo helpt dit instrument partijen om samenwerkingsmogelijkheden te verkennen door de belangrijkste elementen en kansen te identificeren en belangrijke logische consequenties te doordenken en bediscussiëren.","Samenwerken; coalities vorming; multifunctioneel","nl","report","TU Delft en Deltares","","","","","","","","","","Policy Analysis","","",""
"uuid:5114fb58-c50f-47a7-93f8-c34636f775a4","http://resolver.tudelft.nl/uuid:5114fb58-c50f-47a7-93f8-c34636f775a4","Open data for evidence-based decision-making: Data-driven government resulting in uncertainty and polarization","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","Over the last decade, more and more data are collected and opened. Governments actively stimulate the opening of data to increase citizen engagement to support policy-making processes. Evidence-based policy-making is the situation whereby decisions made are based on factual data. The common expectation is that releasing data will result in evidence-based decision-making and more trust in government decisions. This study aims to provide insight into how evidence-based policy based on open data can result into uncertainty and even polarize the policy-making process. We analyze a case study in which traffic and road utilization datasets are used and model the decision-making process using the Business Process Model and Notation (BPMN). The BPMN model shows how the government and business organizations can use the data and give different interpretations. Data-driven decision-making might potentially create uncertainty, polarization, and less trust in decisions as stakeholders can give different meanings to the data and arrive at different outcomes. In contrast to the common belief, we found that the more data released, the more discussions happened about what is desired according to the data. The various directions derived from the data can even polarize decisionmaking. In other words, the more data opened, the more people can construct their perception of reality. For further research, we recommend understanding the types and role of data to create an evidence-based approach.","Data-driven; Decision-making; Evidence-based; Open data; Polarization; Trust; Uncertainty","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:68cd30ac-a3d2-4187-b9aa-3dc0502d2199","http://resolver.tudelft.nl/uuid:68cd30ac-a3d2-4187-b9aa-3dc0502d2199","A Comparative Study of Gas Flooding and Foam-Assisted Chemical Flooding in Bentheimer Sandstones","Janssen, M.T.G. (TU Delft Reservoir Engineering); Pilus, Rashidah M. (Universiti Teknologi Petronas); Zitha, P.L.J. (TU Delft Reservoir Engineering)","","2019","A laboratory study of principal immiscible gas flooding schemes is reported. Very well-controlled experiments on continuous gas injection, water-alternating-gas (WAG) and alkaline–surfactant–foam (ASF) flooding were conducted. The merits of WAG and ASF compared to continuous gas injection were examined. The impact of ultra-low oil–water (o/w) interfacial tension (IFT), an essential feature of the ASF scheme along with foaming, on oil mobilisation and displacement of residual oil to waterflood was also assessed. Incremental oil recoveries and related displacement mechanisms by ASF and WAG compared to continuous gas injection were investigated by conducting CT-scanned core-flood experiments using n-hexadecane and Bentheimer sandstone cores. Ultimate oil recoveries for WAG and ASF at under-optimum salinity (o/w IFT of 10−1 mN/m) were found to be similar [60 ± 5% of the oil initially in place (OIIP)]. However, ultimate oil recovery for ASF at (near-)optimum salinity (o/w IFT of 10−2 mN/m) reached 74 ± 8% of the OIIP. Results support the idea that WAG increases oil recovery over continuous gas injection by drastically increasing the trapped gas saturation at the end of the first few WAG cycles. ASF flooding was able to enhance oil recovery over WAG by effectively lowering o/w IFT (< 10−1 mN/m) for oil mobilisation. ASF at (near-)optimum salinity increased clean oil fraction in the production stream over under-optimum salinity ASF.","Alkaline; Enhanced oil recovery; Foam; Immiscible gas injection; Oil; Surfactant; Water-alternating-gas","en","journal article","","","","","","","","2020-01-02","","","Reservoir Engineering","","",""
"uuid:20e3cc7f-3fba-4543-8e53-27ea5bd5adc8","http://resolver.tudelft.nl/uuid:20e3cc7f-3fba-4543-8e53-27ea5bd5adc8","Treewidth of display graphs: Bounds, brambles and applications","Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Kelk, Steven (Universiteit Maastricht); Stamoulis, Georgios (Universiteit Maastricht); Wu, Taoyang (University of East Anglia)","","2019","Phylogenetic trees and networks are leaf-labelled graphs used to model evolution. Display graphs are created by identifying common leaf labels in two or more phylogenetic trees or networks. The treewidth of such graphs is bounded as a function of many common dissimilarity measures between phylogenetic trees and this has been leveraged in fixed parameter tractability results. Here we further elucidate the properties of display graphs and their interaction with treewidth. We show that it is NP-hard to recognize display graphs, but that display graphs of bounded treewidth can be recognized in linear time. Next we show that if a phylogenetic network displays (i.e. topologically embeds) a phylogenetic tree, the treewidth of their display graph is bounded by a function of the treewidth of the original network (and also by various other parameters). In fact, using a bramble argument we show that this treewidth bound is sharp up to an additive term of 1. We leverage this bound to give an FPT algorithm, parameterized by treewidth, for determining whether a network displays a tree, which is an intensively-studied problem in the field. We conclude with a discussion on the future use of display graphs and treewidth in phylogenetics.","","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:599d7189-cedb-4738-80d6-0fc66f5c0029","http://resolver.tudelft.nl/uuid:599d7189-cedb-4738-80d6-0fc66f5c0029","Implementing social sustainability in urban area development: Understanding the implementation of social sustainability in urban area development projects through the capabilities approach","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2019","","","en","poster","","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:d729af48-5d09-4d70-900d-57674ebd1004","http://resolver.tudelft.nl/uuid:d729af48-5d09-4d70-900d-57674ebd1004","The consequences of blockchain architectures for the governance of public services: A case study of the movement of excise goods under duty exemptions","Allessie, David (Student TU Delft); Janssen, M. (Student TU Delft); Ubacht, J. (TU Delft Information and Communication Technology); Cunningham, S. (TU Delft Policy Analysis); van der Harst, G. (Student TU Delft)","","2019","Blockchain technology has the potential to provide public services directly to the public. This challenges the need for public organizations, who traditionally provided these services. Much of the current work is focused on the technology, whereas the influence on public administration structure has gained less attention. The goal of this paper is to investigate the impact of blockchain technology on the governance of public service provision. For this, we performed a case study of an EU-wide system that monitors the movement of excise goods under duty suspension. We developed two scenarios for blockchain technology’s use based on a permissionless blockchain architecture on the one hand and a permissioned one on the other. The scenarios were evaluated based on their impact on transaction validation, data quality and governance. The findings show that blockchain technology alone cannot be an alternative for the current data quality controls, equal access assurances and adaptations to legislation conducted by public administrations. As such, governments will remain playing a key role in registration of documents and assets, however, the governance will likely change depending on the type of blockchain architecture.","Public services; blockchain; transformation; public choice; transaction cost","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:30e991b3-ec01-448e-ba55-0ea36359ae17","http://resolver.tudelft.nl/uuid:30e991b3-ec01-448e-ba55-0ea36359ae17","Exploring determinants influencing a service-oriented enterprise strategy: An executive management view","Plugge, A.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Kotlarsky, Julia (editor); Oshri, Ilan (editor); Willcocks, Leslie (editor)","2019","Due to the convergence of rapid business developments and digitization challenges firms need to become more agile. A service-oriented enterprise (SOE) strategy is an approach that decomposes an enterprise into business services that are modular, accessible, and interoperable, in which parts can be provided in-house, or outsourced to the market. The SOE concept has mainly been approached from a technological view and little is known about what type of strategic SOE determinants are relevant. A firm’s strategy to implement an SOE requires top management support. Therefore, insights at executive level are a prerequisite to identify strategic business directions. We conducted a literature review and a qualitative case study amongst eleven firms at executive level in various industries. Business services, business processes, and enabling technology were found in the literature as key determinants influencing a firm’s SOE strategy. Subsequently, the interviews at executive level identified that organizational readiness, knowledge and skills, and governance also affect the SOE strategy of firms. We suggest that a holistic view is required to study the complexity of an SOE. By using an executive view we contribute to IS and business literature as strategic SOE determinants become more explicit.","Business processes; Business services; Enabling technology; Service-oriented enterprise; Strategic decision-making","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-09-06","","","Information and Communication Technology","","",""
"uuid:25d6cea8-b30e-4c5f-8c7d-6e6384b1bb71","http://resolver.tudelft.nl/uuid:25d6cea8-b30e-4c5f-8c7d-6e6384b1bb71","A Comparative Study of Methods for Deciding to Open Data","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Shishkov, Boris (editor); Shishkov, Boris (editor); Shishkov, Boris (editor)","2019","Governments may have their own business processes to decide to open data, which might be supported by decision-making tools. At the same time, analyzing potential benefits, costs, risks, and other effects-adverse of disclosing data are challenging. In the literature, there are various methods to analyze the potential advantages and disadvantages of opening data. Nevertheless, none of them provides discussion into the comparative studies in terms of strengths and weaknesses. In this study, we compare three methods for disclosing data, namely Bayesian-belief networks, Fuzzy multi-criteria decision-making, and Decision tree analysis. The comparative study is a mechanism for further studying the development of a knowledge domain by performing a feature-by-feature at the same level of functionalities. The result of this research shows that the methods have different strengths and weaknesses. The Bayesian-belief Networks has higher accuracy in comparison, and able to construct the causal relationships of the selected variable under uncertainties. Yet, this method is more resource intensive. This study can contribute to the decision-makers and respected researchers to a better comprehend and provide recommendation related to the three methods comparison.","Bayesian-belief networks; Decision tree analysis; Decision-making; Fuzzy multi-criteria decision making; Methods; Open data","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-01-01","","","Information and Communication Technology","","",""
"uuid:8cee8cd4-cd03-4bba-8a38-e5fb331c8c7d","http://resolver.tudelft.nl/uuid:8cee8cd4-cd03-4bba-8a38-e5fb331c8c7d","Governance as a Condition for Creating Business Value from Enterprise Architecture","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Shishkov, Boris (editor); Shishkov, Boris (editor); Shishkov, Boris (editor)","2019","IT Governance is often viewed as an important factor for creating business value for firms. However, there is limited work investigating the relationship between architectural governance and the contributions of enterprise architecture (EA) to firm performance. Based on a study of more than 15 cases the analyzes shows that architectural governance is a condition for the ability to create business value from the EA function. The cases also show that architectural governance depends on the context and there is no best way of EA governance that fits very situation. Architectural governance complements enterprise architecture and should ensure that EA efforts are coordinated and used by the business to improve firm performance. In many cases EA and architectural governance were found to be strongly connected, making it difficult to separate them. This strong dependence suggests that a change in EA influences the governance and vice versa. Architectural governance introduces more bureaucracy and administrative work, but paradoxically can result in the creation of more business flexibility and agility.","Architectural governance business value; Architecture; Contingency approach; Enterprise architecture; IT governance","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-01-04","","","Information and Communication Technology","","",""
"uuid:c315d878-8528-494d-b718-b25df757ab8a","http://resolver.tudelft.nl/uuid:c315d878-8528-494d-b718-b25df757ab8a","A Comparative Study of Business-to-Government Information Sharing Arrangements for Tax Reporting","Kurnia, Rizky Amalia (Student TU Delft); Praditya, D. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Dwivedi, Yogesh (editor); Ayaburi, Emmanuel (editor); Boateng, Richard (editor); Effah, John (editor)","2019","Having tax transparency is getting more important and enforced by more and more countries around the world. To deal with tax evasion, OECD has developed an Automatic Exchange of Information (AEOI) standard. The implementation of this standard differs among countries. In this study, we explore factors explaining the differences between two information sharing arrangements in implementing the AEOI standard. In both cases, the information sharing architecture and the accompanying governance arrangement are investigated. The findings of the exploratory study show that the differences are influenced by available IT capabilities, interoperability, trust among information sharing partners, power difference, inter-organizational relationship, and perceived benefits of implementing such arrangements. Ten propositions are derived explaining the differences which can be tested in further research.","AEOI; Business-to-government; E-government; Information sharing; Inter-organizational information sharing; Standardization; Tax report","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-12-19","","","Information and Communication Technology","","",""
"uuid:d558cf71-c4dd-4c65-8ec1-dd84ac94c9d3","http://resolver.tudelft.nl/uuid:d558cf71-c4dd-4c65-8ec1-dd84ac94c9d3","Perception and control of low cable operation forces in voluntary closing body-powered upper-limb prostheses","Hichert, M. (TU Delft Biomechatronics & Human-Machine Control); Abbink, D.A. (TU Delft Human-Robot Interaction); Vardy, A.N. (TU Delft Biomechatronics & Human-Machine Control); van der Sluis, Corry K. (University Medical Center Groningen); Janssen, Wim G.M. (Erasmus MC); Brouwers, Michael A.H. (Rehabilitation Institute De Hoogstraat); Plettenburg, D.H. (TU Delft Biomechatronics & Human-Machine Control)","","2019","Operating a body-powered prosthesis can be painful and tiring due to high cable operation forces, illustrating that low cable operation forces are a desirable design property for body-powered prostheses. However, lower operation forces might negatively affect controllability and force perception, which is plausible but not known. This study aims to quantify the accuracy of cable force perception and control for body-powered prostheses in a low cable operation force range by utilizing isometric and dynamic force reproduction experiments. Twenty-five subjects with trans-radial absence conducted two force reproduction tasks; first an isometric task of reproducing 10, 15, 20, 25, 30 or 40 N and second a force reproduction task of 10 and 20 N, for cable excursions of 10, 20, 40, 60 and 80 mm. Task performance was quantified by the force reproduction error and the variability in the generated force. The results of the isometric experiment demonstrated that increasing force levels enlarge the force variability, but do not influence the force reproduction error for the tested force range. The second experiment showed that increased cable excursions resulted in a decreased force reproduction error, for both tested force levels, whereas the force variability remained unchanged. In conclusion, the design recommendations for voluntary closing body-powered prostheses suggested by this study are to minimize cable operation forces: this does not affect force reproduction error but does reduce force variability. Furthermore, increased cable excursions facilitate users with additional information to meet a target force more accurately.","","en","journal article","","","","","","","","","","","Biomechatronics & Human-Machine Control","","",""
"uuid:a5e6de30-2723-44e8-b291-78fa14fe0c1d","http://resolver.tudelft.nl/uuid:a5e6de30-2723-44e8-b291-78fa14fe0c1d","Understanding the relationship between income inequality and residential segregation of socioeconomic groups","Tammaru, T. (TU Delft OLD Urban Renewal and Housing); Marcińczak, Szymon (Uniwersytet Lodzki; University of Tartu); Aunap, Raivo (University of Tartu); van Ham, M. (TU Delft OLD Urban Renewal and Housing); Janssen, H.J. (TU Delft OLD Urban Renewal and Housing)","","2019","This paper provides new insights into the relationships between income inequality and residential segregation between socioeconomic groups by undertaking a comparative study of European urban regions. In Europe, income inequalities are the lowest in North Europe and the highest in South Europe. In many East European countries, a switch from low inequality to high inequality has taken place. The main findings show that changes in the levels of residential segregation between socioeconomic groups correlate to changes in the levels of income inequality found approximately 10 years earlier, that is, with a time lag.","income inequality; socioeconomic segregation; comparative urban studies; South Europe; North Europe; East Europe","en","journal article","","","","","","","","","","","OLD Urban Renewal and Housing","","",""
"uuid:7245449d-2668-4ad0-b588-ca3ee2017764","http://resolver.tudelft.nl/uuid:7245449d-2668-4ad0-b588-ca3ee2017764","Thematic mapping of cloud computing based on a systematic review: a tertiary study","Delavari, Vahid (Tarbiat Modares University); Shaban, Elahi (Tarbiat Modares University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Hassanzadeh, Alireza (Tarbiat Modares University)","","2019","Purpose: A large number of systematic reviews (SRs) studies have been performed in the cloud computing field, demonstrating miscellaneous outcomes and utilizing different approaches. Accordingly, a meta-review of cloud SRs is needed to appraise the results of such studies and create an integrated understanding. The paper aims to discuss these issues. Design/methodology/approach: A tertiary study was conducted using a systematic method to analyze SRs including two stages: searching and screening the SRs and thematic synthesis of results. As a qualitative data management tool, Nvivo software was used to support the research process, for data coding and synthesis. Findings: First, by searching electronic sources between the year of 2011–2016, out of a total of 142 identified articles, 94 articles were included according to pre-determined criteria, of which 76 articles were approved after qualitative evaluation. In the second stage, identifying the research themes, a map of the concepts and issues related to each theme was drawn up. The analysis shows that the quality of articles has improved but can be further enhanced using methodological guidelines as well as supporting tools. The research has focused more on the technical aspect, although there is an equal demand for synthesizing of cloud governance concepts. Originality/value: This is the first tertiary study which presents the main research themes and concepts of cloud SRs in form of thematic maps by using the thematic synthesis and SR methods. This paper also provides some recommendations to improve reviews after evaluating the quality of papers. This study can support reviewers for future SRs in the field and also helps practitioners and managers to have a better understanding of different aspects of cloud computing.","Cloud computing; Governance; Systematic reviews; Tertiary study; Thematic synthesis","en","review","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-03-23","","","Information and Communication Technology","","",""
"uuid:ff38bfde-9279-4302-9735-553eac0342b6","http://resolver.tudelft.nl/uuid:ff38bfde-9279-4302-9735-553eac0342b6","Citizens’ Motivations for Engaging in Open Data Hackathons","Purwanto, A. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Panagiotopoulos, Panos (editor); Edelmann, Noella (editor); Parycek, Peter (editor); Lampoltshammer, Thomas (editor); Glassey, Olivier (editor); Misuraca, Gianluca (editor); Re, Barbara (editor)","2019","Engaging citizens in open data hackathons provides opportunities for innovation and the generation of new services and products. This paper aims to explore the motivations of citizens who engage in open agriculture data hackathons. We conducted a case study and analyzed data collected from 161 participants of 11 farming hackathons held between 2016 and 2018 in the Netherlands. We found that participants of open agriculture data hackathons have different roles, including business developer, concept thinker, data analyst, data owner, developer, manager, marketer, problem owner, and student. Our analysis shows that citizens are predominantly motivated to engage in open agricultural data hackathons as part of their work. Furthermore, developers and problem owners are mainly motivated by fun and enjoyment. This indicates that it is important for open data policymakers and hackathon organizers to consider different approaches based on citizens’ roles when organizing open data hackathons. This paper contributes to the literature by providing insight in the motivations of citizens engaging in open agriculture data hackathons in comparison with hackathons in other sectors, and by mapping citizens’ roles to their motivations for engaging in such hackathons.","Agriculture; Citizen engagement; Hackathon; Open Government Data; Open data","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-01-26","","","Information and Communication Technology","","",""
"uuid:7577cbdf-d83f-4d7f-9b6a-ff5ce0f256f7","http://resolver.tudelft.nl/uuid:7577cbdf-d83f-4d7f-9b6a-ff5ce0f256f7","Decision Tree Analysis for Estimating the Costs and Benefits of Disclosing Data","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven)","Pappas, Ilias O. (editor); Pappas, Ilias O. (editor); Krogstie, John (editor); Jaccheri, Letizia (editor); Mikalef, Patrick (editor); Dwivedi, Yogesh K. (editor); Mäntymäki, Matti (editor)","2019","The public expects government institutions to open their data to enable society to reap the benefits of these data. However, governments are often reluctant to disclose their data due to possible disadvantages. These disadvantages, at the same time, can be circumstances by processing the data before disclosing. Investments are needed to be able to pre-process a dataset. Hence, a trade-off between the benefits and cost of opening data needs to be made. Decisions to disclose are often made based on binary options like “open” or “closed” the data, whereas also parts of a dataset can be opened or only pre-processed data. The objective of this study is to develop a decision tree analysis in open data (DTOD) to estimate the costs and benefits of disclosing data using a DTA approach. Experts’ judgment is used to quantify the pay-offs of possible consequences of the costs and benefits and to estimate the chance of occurrence. The result shows that for non-trivial decisions the DTOD helps, as it allows the creation of decision structures to show alternatives ways of opening data and the benefits and disadvantages of each alternative.","Benefits; Costs; Decision tree analysis; Estimation; Investments; Open data; Open government","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-02-14","","","Information and Communication Technology","","",""
"uuid:65614a67-0576-4b27-af80-d921f87ca976","http://resolver.tudelft.nl/uuid:65614a67-0576-4b27-af80-d921f87ca976","Creation of Conductive Graphene Materials by Bacterial Reduction Using Shewanella Oneidensis","Lehner, B. (TU Delft BN/Stan Brouns Lab); Janssen, V.A.E.C. (TU Delft QN/van der Zant Lab); Spiesz, E.M. (TU Delft BN/Marie-Eve Aubin-Tam Lab); Benz, D. (TU Delft ChemE/Product and Process Engineering); Brouns, S.J.J. (TU Delft BN/Stan Brouns Lab); Meyer, Anne S. (University of Rochester); van der Zant, H.S.J. (TU Delft QN/van der Zant Lab)","","2019","Graphene's maximized surface-to-volume ratio, high conductance, mechanical strength, and flexibility make it a promising nanomaterial. However, large-scale graphene production is typically cost-intensive. This manuscript describes a microbial reduction approach for producing graphene that utilizes the bacterium Shewanella oneidensis in combination with modern nanotechnology to enable a low-cost, large-scale production method. The bacterial reduction approach presented in this paper increases the conductance of single graphene oxide flakes as well as bulk graphene oxide sheets by 2.1 to 2.7 orders of magnitude respectively while simultaneously retaining a high surface-area-to-thickness ratio. Shewanella-mediated reduction was employed in conjunction with electron-beam lithography to reduce one surface of individual graphene oxide flakes. This methodology yielded conducting flakes with differing functionalization on the top and bottom faces. Therefore, microbial reduction of graphene oxide enables the development and up-scaling of new types of graphene-based materials and devices with a variety of applications including nano-composites, conductive inks, and biosensors, while avoiding usage of hazardous, environmentally-unfriendly chemicals.","graphene oxide; microbial reductions; nanomaterials; Shewanella oneidensis; sustainable reactions","en","journal article","","","","","","","","","","","BN/Stan Brouns Lab","","",""
"uuid:9fa41fe7-21d4-4b26-8244-e2a2b7328894","http://resolver.tudelft.nl/uuid:9fa41fe7-21d4-4b26-8244-e2a2b7328894","The value of and myths about enterprise architecture","Gong, Y. (Wuhan University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","Enterprise Architecture (EA) has been embraced by many organizations to improve the value of their IT. Our systematic literature review (SLR) reveals that EA is a broad concept that is interpreted and used in many different ways. This breadth can be explained by the various starting points taken, and by the content-dependent nature of many EA efforts. Unsurprisingly, the literature presents diverse views on value creation and locates the value of EA in a broad range of areas. Only half of the articles provide empirical evidence supporting the EA value claims. Frequently, values are assumed to be the result of EA efforts, but many alternative explanations are possible. Based on the SLR findings, we identify EA myths that are attributable to an overly simplistic conceptualization of EA. These myths have their basis in the claim that EA is an instrument that can solve almost any kind of enterprise problem. This fails to acknowledge that EA in itself often does not provide value, but is an instrument enabling the creation of value. Based on our findings, we recommend demystifying EA by analysing the context-dependent mechanisms behind EA that result in value creation and developing rigorous evidence-based approaches to better understand EA.","Enterprise architecture; Information architecture; IT architecture; Systematic literature review; Value","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:6bffe34f-c353-4525-9dad-3513287abac6","http://resolver.tudelft.nl/uuid:6bffe34f-c353-4525-9dad-3513287abac6","Determinants of software-as-a-service benefits and impact on firm performance","Loukis, Euripidis (University of the Aegean); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Mintchev, Ianislav (Bosch Security System)","","2019","Software as a Service (SaaS) is increasingly used by firms for sourcing business application software. SaaS can enable a cost reduction and quality improvement of existing operations and provide rapid and low-cost innovation. However, decision makers are unclear about how they can benefit from SaaS. This study contributes to filling this knowledge gap by investigating factors that determine the magnitudes of operational and innovational benefits and firm performance. These research hypotheses were tested using data collected through a survey of 102 Dutch firms that use sophisticated financial SaaS services. The results show that a firm's adaptation to the SaaS model as well as its ACAP positively affects operational and innovation benefits, whereas contractual governance positively affects only the innovational benefits, and relational governance does not affect any of these two types of benefits. Although both operational and innovational benefits positively impact a firm's performance, the former have a stronger impact than the latter. The insights gained from our survey can support firms' decision-making concerning the maximization of the business benefits and firm performance.","Absorptive capacity; Cloud Computing; Decision support; Firm performance; Governance; Software as a Service","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:d5daab78-03d1-406c-a460-b3d080277bc7","http://resolver.tudelft.nl/uuid:d5daab78-03d1-406c-a460-b3d080277bc7","Multiresolution Time-of-arrival Estimation from Multiband Radio Channel Measurements","Kazaz, T. (TU Delft Signal Processing Systems); Rajan, R.T. (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); van der Veen, A.J. (TU Delft Signal Processing Systems)","","2019","Achieving high resolution time-of-arrival (TOA) estimation in multipath propagation scenarios from bandlimited observations of communication signals is challenging because the multipath channel impulse response (CIR) is not bandlimited. Modeling the CIR as a sparse sequence of Diracs, TOA estimation becomes a problem of parametric spectral inference from observed bandlimited signals. To increase resolution without arriving at unrealistic sampling rates, we consider multiband sampling approach, and propose a practical multibranch receiver for the acquisition. The resulting data model exhibits multiple shift invariance structures, and we propose a corresponding multiresolution TOA estimation algorithm based on the ESPRIT algorithm. The performance of the algorithm is compared against the derived Cramér Rao Lower Bound, using simulations with standardized ultra-wideband (UWB) channel models. We show that the proposed approach provides high resolution estimates while reducing spectral occupancy and sampling costs compared to traditional UWB approaches.","cognitive radio; multiband sampling; multipath channel estimation; multiresolution estimation; time-of-arrival","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-11-12","","","Signal Processing Systems","","",""
"uuid:55571129-06bd-48a9-8a01-a10f0721c6c1","http://resolver.tudelft.nl/uuid:55571129-06bd-48a9-8a01-a10f0721c6c1","Unraveling upper extremity performance in Duchenne muscular dystrophy: A biophysical model","Janssen, Mariska M.H.P. (Radboud Universiteit Nijmegen); Harlaar, J. (TU Delft Biomechatronics & Human-Machine Control); Koopman, Bart (University of Twente); de Groot, Imelda J.M. (Radboud Universiteit Nijmegen)","","2019","This study aimed to identify critical physiological outcome variables underlying reduced upper extremity task performance in Duchenne muscular dystrophy (DMD). These critical variables were used to propose an explanatory biophysical model of the upper extremity working mechanisms in DMD. Twenty-three DMD patients (8–21 years) participated in this study. Correlations with Brooke scale and Performance of Upper Limb (PUL) score were very high for maximal active joint angle, high for maximal muscle torque and maximal surface electromyography amplitude, and moderate for mean echogenicity and maximal passive joint angle. Multivariable regression analysis showed that maximal active joint angle and maximal muscle torque were significantly associated with Brooke score (R 2 = 0.91). Maximal active joint angle, maximal passive joint angle, and maximal muscle torque were significantly associated with PUL score (R 2 = 0.94). Based on the most critical physiological outcome variables, we constructed an exploratory biophysical model of the working mechanisms leading to limitations in upper extremity task performance. Better insights in these working mechanisms could support clinical management of upper extremity limitations and facilitate the development of interventions. In addition, the model could form the basis for new multi-layered outcome measures for clinical trials.","Biophysical model; Duchenne muscular dystrophy; Electromyography; Range of motion; Upper limb","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2019-09-14","","","Biomechatronics & Human-Machine Control","","",""
"uuid:126282aa-8296-4fd7-92b4-a2ee0f00badb","http://resolver.tudelft.nl/uuid:126282aa-8296-4fd7-92b4-a2ee0f00badb","Reconstructing Tree-Child Networks from Reticulate-Edge-Deleted Subnetworks","Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Moulton, V.L. (University of East Anglia)","","2019","Network reconstruction lies at the heart of phylogenetic research. Two well-studied classes of phylogenetic networks include tree-child networks and level-k networks. In a tree-child network, every non-leaf node has a child that is a tree node or a leaf. In a level-k network, the maximum number of reticulations contained in a biconnected component is k. Here, we show that level-k tree-child networks are encoded by their reticulate-edge-deleted subnetworks, which are subnetworks obtained by deleting a single reticulation edge, if k≥ 2. Following this, we provide a polynomial-time algorithm for uniquely reconstructing such networks from their reticulate-edge-deleted subnetworks. Moreover, we show that this can even be done when considering subnetworks obtained by deleting one reticulation edge from each biconnected component with k reticulations.","Network encoding; Phylogenetic network; Reticulate-edge-deleted subnetworks; Tree-child networks","en","journal article","","","","","","green","","","","","Discrete Mathematics and Optimization","","",""
"uuid:f26a9205-24ae-4d33-a569-565a19eb5109","http://resolver.tudelft.nl/uuid:f26a9205-24ae-4d33-a569-565a19eb5109","Integrated impedance bridge for absolute capacitance measurements at cryogenic temperatures and finite magnetic fields","Verbiest, G.J. (JARA-FIT and 2nd Institute of Physics); Janssen, H. (JARA-FIT and 2nd Institute of Physics); Xu, D. (TU Delft QRD/Kouwenhoven Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft); Ge, X. (JARA-FIT and 2nd Institute of Physics); Goldsche, M. (Forschungszentrum Jülich GmbH; JARA-FIT and 2nd Institute of Physics); Sonntag, J. (Forschungszentrum Jülich GmbH; JARA-FIT and 2nd Institute of Physics); Khodkov, T. (Forschungszentrum Jülich GmbH; JARA-FIT and 2nd Institute of Physics); Banszerus, L. (Forschungszentrum Jülich GmbH; JARA-FIT and 2nd Institute of Physics); Von Den Driesch, N. (Forschungszentrum Jülich GmbH)","","2019","We developed an impedance bridge that operates at cryogenic temperatures (down to 60 mK) and in perpendicular magnetic fields up to at least 12 T. This is achieved by mounting a GaAs HEMT amplifier perpendicular to a printed circuit board containing the device under test and thereby parallel to the magnetic field. The measured amplitude and phase of the output signal allows for the separation of the total impedance into an absolute capacitance and a resistance. Through a detailed noise characterization, we find that the best resolution is obtained when operating the HEMT amplifier at the highest gain. We obtained a resolution in the absolute capacitance of 6.4 aF/Hz at 77 K on a comb-drive actuator while maintaining a small excitation amplitude of 15 kBT/e. We show the magnetic field functionality of our impedance bridge by measuring the quantum Hall plateaus of a top-gated hBN/graphene/hBN heterostructure at 60 mK with a probe signal of 12.8 kBT/e.","","en","journal article","","","","","","","","","","","QRD/Kouwenhoven Lab","","",""
"uuid:816ce93c-ebce-4e71-b56f-87eb113f9658","http://resolver.tudelft.nl/uuid:816ce93c-ebce-4e71-b56f-87eb113f9658","A 4D tomographic ionospheric model to support PPP-RTK","Olivares-Pulido, G. (CRC for Spatial Information); Terkildsen, M. (Bureau of Meteorology Australia); Arsov, K. (Bureau of Meteorology Australia); Teunissen, P.J.G. (TU Delft Mathematical Geodesy and Positioning; Curtin University); Khodabandeh, A. (Curtin University; University of Melbourne); Janssen, V. (NSW DFSI Spatial Services)","","2019","Successful implementation of integer ambiguity resolution enabled precise point positioning (aka PPP-RTK) algorithms is inextricably linked to the ability of a user to perform near real-time positioning by quickly and reliably resolving the integer carrier-phase ambiguities. In the PPP-RTK technique, a major barrier to successful ambiguity resolution is the unmodelled impact of the ionosphere. We present a 4D ionospheric tomographic model that computes in real time the ionospheric electron density as a linear combination of basis functions, namely B-splines. The results show that when the ionospheric estimates are provided as atmospheric corrections for a PPP-RTK end-user, the time to fix its horizontal position below 10 cm is around 20 epochs (the sample rate is 30 s) at the 90 % of the cumulative distribution function (CDF), as opposed to the time it takes when no external corrections are provided, which is around 80 epochs at 90 % of the CDF.","B-splines; GNSS; Ionosphere; PPP-RTK; Tomography","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-01-22","","","Mathematical Geodesy and Positioning","","",""
"uuid:7bdae86a-0209-4e53-83d0-c531dd3465ec","http://resolver.tudelft.nl/uuid:7bdae86a-0209-4e53-83d0-c531dd3465ec","Artificial Intelligence (AI): Multidisciplinary perspectives on emerging challenges, opportunities, and agenda for research, practice and policy","Dwivedi, Yogesh K. (Swansea University); Hughes, Laurie (Swansea University); Ismagilova, Elvira (Bradford University); Aarts, Gert (Swansea University); Coombs, Crispin (Loughborough University); Crick, Tom (Swansea University); Duan, Yanqing (University of Bedfordshire); Dwivedi, Rohita (Prin. L.N. Welingkar Institute of Management Development & Research); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2019","As far back as the industrial revolution, significant development in technical innovation has succeeded in transforming numerous manual tasks and processes that had been in existence for decades where humans had reached the limits of physical capacity. Artificial Intelligence (AI) offers this same transformative potential for the augmentation and potential replacement of human tasks and activities within a wide range of industrial, intellectual and social applications. The pace of change for this new AI technological age is staggering, with new breakthroughs in algorithmic machine learning and autonomous decision-making, engendering new opportunities for continued innovation. The impact of AI could be significant, with industries ranging from: finance, healthcare, manufacturing, retail, supply chain, logistics and utilities, all potentially disrupted by the onset of AI technologies. The study brings together the collective insight from a number of leading expert contributors to highlight the significant opportunities, realistic assessment of impact, challenges and potential research agenda posed by the rapid emergence of AI within a number of domains: business and management, government, public sector, and science and technology. This research offers significant and timely insight to AI technology and its impact on the future of industry and society in general, whilst recognising the societal and industrial influence on pace and direction of AI development.","AI; Artificial intelligence; Cognitive computing; Expert systems; Machine learning; Research agenda","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-02-27","","","Information and Communication Technology","","",""
"uuid:d0a0108c-c0c0-476a-b6c4-95cd70762216","http://resolver.tudelft.nl/uuid:d0a0108c-c0c0-476a-b6c4-95cd70762216","Citizens' perception about M-government services: Results from an exploratory survey","Rana, Nripendra P. (Swansea University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Sahu, Ganesh P. (Motilal Nehru National Institute of Technology); Baabdullah, Abdullah (King Abdulaziz University); Dwivedi, Yogesh K. (Swansea University)","Bui, Tung X. (editor)","2019","The development of mobile technology is facilitating the transformation in a way that governments deliver their services. Mobile government is one area that has received very little research, but it can have a tremendous impact on the way citizens engage with their government. This research analyses the data gathered from 81 respondents through online survey on the various aspects of mobile government and collects their views on some of the key questions related to the use of mobile government. The findings showed that although citizens are aware of the possibilities they hardly used mobile devices as a direct communication channel with government. Most users tend to use social media platforms and social media is used as an intermediary between government and citizens. The findings of this research also indicated that although the users are well aware of m-government services and own smartphones, only a handful of them use their mobiles for accessing government services.","Acceptance; Adoption; Awareness; Citizens; E-government; India; M-government; Social media","en","conference paper","IEEE","","","","","","","","","","Information and Communication Technology","","",""
"uuid:39e06b49-208c-460e-9afd-eb397582a60c","http://resolver.tudelft.nl/uuid:39e06b49-208c-460e-9afd-eb397582a60c","Anticiperen op demografische trends in gebiedsontwikkeling: Wat, waar en voor wie bouwen we?","Janssen, C. (TU Delft Practice Chair Urban Area Development); Daamen, T.A. (TU Delft Urban Development Management)","","2019","Meer eenpersoonshuishoudens, immigratie en nieuwe gemeenschapszin: dat zijn de belangrijkste kenmerken van hoe Nederland de komende tientallen jaren verandert. Wetenschappers lichten toe wat deze demografische trends betekenen voor gebiedsontwikkelaars","sociaal; woningmarkt","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:12961f87-eeff-41b5-8688-df28e0ad9860","http://resolver.tudelft.nl/uuid:12961f87-eeff-41b5-8688-df28e0ad9860","Optimization in the Photolithography Bay: Scheduling and the Traveling Salesman Problem","Janssen, T.M.L. (TU Delft Discrete Mathematics and Optimization)","Aardal, K.I. (promotor); van Iersel, L.J.J. (copromotor); Delft University of Technology (degree granting institution)","2019","In a semiconductor factory, integrated circuits (or chips) are constructed on top of slabs of silicon, called wafers. The construction of these wafers is complicated and many different processing steps are needed to gradually building the chip layer by layer. Of these steps, photolithography uses the most expensive equipment. Therefore, the photolithography equipment is often the bottleneck of the factory. Photolithography is used to transfer the geometric pattern of a chip on a wafer. First a light-sensitive photoresist is put on the wafer. ThenUV light is sent through a photomask on the photoresist. The exposed parts of the photoresist will chemically react, creating the pattern. After the exposure, chemical reactions and metal depositions make a layer of circuits on the wafer. In this thesis, we try to increase the production of the semiconductor factory by reducing the time needed for the photolithography. In the first part, we look at themachine level. The time to process a wafer on a lithography steppermachine is determined by different elements of the process (Chapter 2). It turns out that the blade movement required in the exposure step has a significant impact total time required to process a wafer. The blade movement in turn depends on the order in which the different images are processed. Hence we want to find an ordering of the images, such that the blade movement is minimized. This problem turns out to be equivalent to the a priori traveling salesmen problem in the scenario model. The practical problem instances found are solved a limited amount of time using an integer linear programming solver and the average blade movement is reduced by approximately 20%, which reduces the average exposure time 1.6%.","","en","doctoral thesis","","978-94-6332-460-1","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:b49f3461-0be4-4ddc-8b89-38804da83da0","http://resolver.tudelft.nl/uuid:b49f3461-0be4-4ddc-8b89-38804da83da0","Gebiedsontwikkeling voor de inclusieve stad: wat is dat?","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2019","Inclusieve gebiedsontwikkeling, wat is dat? promovenda Céline Janssen schrijft er in haar blog over. “Begrip van wat ‘de inclusieve stad’ is, is essentieel voor een volledig beeld – en dat is juist waar ‘inclusief’ om gaat.”","inclusieve stad; gebiedsontwikkeling","en","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:a91537b0-fee6-49bd-a859-183fd8efb89d","http://resolver.tudelft.nl/uuid:a91537b0-fee6-49bd-a859-183fd8efb89d","Foam-assisted chemical flooding for enhanced oil recovery: Effects of slug salinity and drive foam strength","Janssen, M.T.G. (TU Delft Reservoir Engineering); Mutawa, Abdulaziz S. (Student TU Delft); Pilus, Rashidah M. (Universiti Teknologi Petronas); Zitha, P.L.J. (TU Delft Reservoir Engineering)","","2019","The novel enhanced oil recovery (EOR) technique combining the reduction of oil/water (o/w) interfacial tensions (IFT) to ultralow values and generation of a foam drive for mobility control is known as foam-assisted chemical flooding (FACF). We present a well-controlled laboratory study on the feasibility of FACF at reservoir conditions. Two specially selected chemical surfactants were screened on their stability in sea water at 90 °C. The ability of both surfactants to generate stable foam in bulk was studied in the presence and absence of crude oil. It led to the composition of the foam drive formulation for drive mobility control. Phase behavior scan studies, for the two crude oil/surfactant/brine systems, yielded the design of the chemical slug capable of mobilizing residual oil by drastically lowering the o/w IFT. Core-flood experiments were performed in Bentheimer sandstones previously brought to a residual oil to waterflood of 0.33 ± 0.02. A surfactant slug at under-optimum (o/w IFT of 10-2 mN/m) or optimum (o/w IFT of 10-3 mN/m) salinity was injected for mobilizing residual oil. It resulted in the formation of an unstable oil bank because of dominant gravitational forces at both salinities. Next, a foam drive was generated either in situ, by co-injecting nitrogen gas and surfactant solution, or pregenerated ex situ and then injected to displace the oil bank. We found that (i) the presence of the crude oil used in this work has a detrimental effect on foam stability in bulk and foam strength in Bentheimer sandstones, (ii) optimum salinity FACF was able to increase the ultimate oil recovery with 5% of the oil in place (OIP) after water flooding compared with under-optimum FACF, and (iii) injection of pregenerated drive foam increased its ultimate oil recovery by 13% of the OIP after water flooding compared to in situ drive foam generation at optimum salinity.","","en","journal article","","","","","","","","","","","Reservoir Engineering","","",""
"uuid:79560623-886d-45e7-90f6-bc5224c601b3","http://resolver.tudelft.nl/uuid:79560623-886d-45e7-90f6-bc5224c601b3","AbSRiM: An Agent-Based Security Risk Management Approach for Airport Operations","Janssen, S.A.M. (TU Delft Air Transport & Operations); Sharpanskykh, Alexei (TU Delft Air Transport & Operations); Curran, R. (TU Delft Air Transport & Operations)","","2019","Security risk management is essential for ensuring effective airport operations. This article introduces AbSRiM, a novel agent-based modeling and simulation approach to perform security risk management for airport operations that uses formal sociotechnical models that include temporal and spatial aspects. The approach contains four main steps: scope selection, agent-based model definition, risk assessment, and risk mitigation. The approach is based on traditional security risk management methodologies, but uses agent-based modeling and Monte Carlo simulation at its core. Agent-based modeling is used to model threat scenarios, and Monte Carlo simulations are then performed with this model to estimate security risks. The use of the AbSRiM approach is demonstrated with an illustrative case study. This case study includes a threat scenario in which an adversary attacks an airport terminal with an improvised explosive device. The approach provides a promising way to include important elements, such as human aspects and spatiotemporal aspects, in the assessment of risk. More research is still needed to better identify the strengths and weaknesses of the AbSRiM approach in different case studies, but results demonstrate the feasibility of the approach and its potential.","Agent-based modeling; airport terminal; security risk management","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:63ae39a6-f973-4ac6-8a76-253a716090d5","http://resolver.tudelft.nl/uuid:63ae39a6-f973-4ac6-8a76-253a716090d5","Sociale waarden in gebiedsontwikkeling: een kwestie van balanceren","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2019","‘Hoe de inclusieve stad eruit moet zien’ strookt niet altijd met ‘hoe deze gemaakt kan worden’. Het implementeren van sociale waarden in gebiedsontwikkeling is een kwestie van balanceren tussen ideaalbeeld en haalbaarheid. Wat is nodig om uiteindelijk tot een sociaal inclusief resultaat te komen?","sociale waarden; gebiedsontwikkeling; inclusieve stad","en","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:73f7c118-e3a6-4868-b704-951e2b98198e","http://resolver.tudelft.nl/uuid:73f7c118-e3a6-4868-b704-951e2b98198e","Zeven interpretaties van inclusieve gebiedsontwikkeling","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2019","Hoe ziet ie er nou uit, die inclusieve stad? Vanuit de vele initiatieven en wijd uitlopende definities die ik voorbij zie komen is het lastig om een eenduidig antwoord vast te stellen. (Niet)-inclusieve gebiedsontwikkeling is een typisch voorbeeld van een wicked problem – iets wat door meerdere factoren wordt beïnvloed en daardoor lastig op te lossen is. Anders dan naar één definitie zoeken kunnen we het begrip beter in verschillende interpretaties opdelen, en proberen te begrijpen in welke situatie we voor de één kiezen en wanneer juist voor de ander.","inclusieve stad; gebiedsontwikkeling","en","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:8cea3a8c-8fab-480c-b31c-05e5b2cc80e9","http://resolver.tudelft.nl/uuid:8cea3a8c-8fab-480c-b31c-05e5b2cc80e9","Multi-scale spatial inequality and consequences for individual socioeconomic outcomes","Janssen, H.J. (TU Delft Urban Studies); Kleinhans, R.J. (TU Delft Urban Studies); van Ham, M. (TU Delft Urban Studies); Melo, Patrícia (University of Lisbon); Andersson, Eva (Stockholm University); Malmberg, Bo (Stockholm University)","","2019","","","en","other","","","","","","","","","","","Urban Studies","","",""
"uuid:7733817d-a6d4-4099-b8a8-6b0c4719ed9c","http://resolver.tudelft.nl/uuid:7733817d-a6d4-4099-b8a8-6b0c4719ed9c","Rearrangement operations on unrooted phylogenetic networks","Janssen, R. (TU Delft Discrete Mathematics and Optimization); Klawitter, Jonathan (The University of Auckland)","","2019","Rearrangement operations transform a phylogenetic tree into another one and hence induce a metric on the space of phylogenetic trees. Popular operations for unrooted phylogenetic trees are NNI (nearest neighbour interchange), SPR (subtree prune and regraft), and TBR (tree bisection and reconnection). Recently, these operations have been extended to unrooted phylogenetic networks-generalisations of phylogenetic trees that can model reticulated evolutionary relationships-where they are called NNI, PR, and TBR moves. Here, we study global and local properties of spaces of phylogenetic networks under these three operations. In particular, we prove connectedness and asymptotic bounds on the diameters of spaces of different classes of phylogenetic networks, including tree-based and level-k networks. We also examine the behaviour of shortest TBR-sequence between two phylogenetic networks in a class, and whether the TBR-distance changes if intermediate networks from other classes are allowed: for example, the space of phylogenetic trees is an isometric subgraph of the space of phylogenetic networks under TBR. Lastly, we show that computing the TBR-distance and the PR-distance of two phylogenetic networks is NP-hard.","Phylogenetic network; Rearrangement","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:2b42233e-02a3-4e53-9d46-7700c1928c86","http://resolver.tudelft.nl/uuid:2b42233e-02a3-4e53-9d46-7700c1928c86","Gaming for Meaningful Interactions in Teleworking Lessons Learned during the COVID-19 Pandemic from Integrating Gaming in Virtual Meetings","Kleiman, F. (TU Delft Information and Communication Technology); Meijer, S.A. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","The recent need for social-distancing caused by COVID-19 resulted in working remotely, which can cause loneliness and disconnect from the organization. The pandemic stimulated people to look for novel ways to interact and, at the same time, socialize with each other. The change to home office increased the number of people using digital video calls; however, these impose restrictions on social bonding. In this commentary, we argue that the social bonding capacity of video calls can be increased by using games. Playing games can create a common object with shared goals, which can give players the feeling of being in the same environment, belonging to the same organization, working on joint objectives, and give an enjoyable experience. All work activities will unlikely return to the office after the pandemic is over, and preparing for remote working and socialization is needed. We recommend several avenues for research, including researching the concepts of online socialization and evaluating the effectiveness of gaming.","Digital government; public servants; meaningful interaction; collaboration; gaming; video call; teleconferencing; teleworking; COVID-19","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9148c4a0-ec69-458f-b59b-eeb4bb4e8e7a","http://resolver.tudelft.nl/uuid:9148c4a0-ec69-458f-b59b-eeb4bb4e8e7a","Boundary conditions for traceability in food supply chains using blockchain technology","Behnke, Kay (FrieslandCampina); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Traceability of ingredients in food supply chains has become paramount in a world in which markets become global, heterogeneous, and complex and in which consumers expect a high level of quality. The food supply chain consists of many organizations having different interests and are often reluctant to share traceability information with each other. Blockchain has been advocated for improving traceability by providing trust. Yet, practice proved to be more stubborn. The goal of this paper is to identify boundary conditions for sharing assurance information to improve traceability. Four cases in the food supply chain have been investigated using a template analysis of 16 interviews. Eighteen boundary conditions categorized in business, regulation, quality and traceability categories have been identified. Some boundary conditions were found in all supply chains, whereas others were found to be supply chain specific. Standardization of traceability processes and interfaces, having a joint platform and independent governance were found to be key boundary conditions before blockchain can be used. Our findings imply that supply chain systems have first to be modified and organizational measures need to be taken to fulfill the boundary conditions, before blockchain can be used successfully.","Blockchain technology; Business boundary conditions; Food supply chain; Traceability","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:211ab197-8328-4a48-96d0-4dfa588b3c49","http://resolver.tudelft.nl/uuid:211ab197-8328-4a48-96d0-4dfa588b3c49","Treatment of sidestream dewatering liquors from thermally hydrolised and anaerobically digested biosolids","Driessen, W. (Paques B.V.); Van Veldhoven, J. T.A. (Waterschap De Dommel); Janssen, M. P.M. (Waterschap De Dommel); van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology)","","2020","A long term operation (22 months) of the sidestream treatment plant at the water and resource recovery facility at the Tilburg sewage works in The Netherlands is presented. This plant treats dewatering reject liquor from thermally hydrolysed (THP) and mesophillic anaerobically digested (MAD) biosolids. The sidestream plant is comprised of a Phospaq struvite reactor for removal and recovery of phosphate and an Anammox reactor for removal of ammoniacal nitrogen. Potential inhibiting characteristics of THP-MAD reject liquor were successfully mitigated by various measures like pre-aeration and addition of dilution water. The sidestream plant demonstrated excellent performance in handling large fluctuations in load and composition, producing effluent with stable low NH4 and BOD concentrations achieving removal efficiencies up to 90% on both NH4 and BOD.","Anaerobic digestion; Anammox; Sidestream treatment; Struvite; Thermal hydrolysis (THP)","en","journal article","","","","","","","","","","","BT/Environmental Biotechnology","","",""
"uuid:2f9eddbc-322f-4f0e-a059-18e51fd6176d","http://resolver.tudelft.nl/uuid:2f9eddbc-322f-4f0e-a059-18e51fd6176d","Exploring solutions to the privacy paradox in the context of e-assessment: informed consent revisited","Muravyeva, Ekaterina (Open University of the Netherlands); Janssen, José (Open University of the Netherlands); Specht, M.M. (TU Delft Web Information Systems); Custers, Bart (Universiteit Leiden)","","2020","Personal data use is increasingly permeating our everyday life. Informed consent for personal data use is a central instrument for ensuring the protection of personal data. However, current informed consent practices often fail to actually inform data subjects about the use of personal data. This article presents the results of a requirements analysis for informed consent from both a legal and usability perspective, considering the application context of educational assessment. The requirements analysis is based on European Union (EU) law and a review of current practices. As the main outcome, the article presents a blueprint which will be the basis for the development of an informed consent template that supports data controllers in establishing an effective and efficient informed consent form. Because the blueprint, and subsequently, the template, distinguishes between legal and usability requirements, it also provides the basis for the mapping of legal requirements in other (non-European) contexts.","e-Assessment; Informed consent; Personal data; Privacy paradox; Sensitive data","en","journal article","","","","","","","","","","","Web Information Systems","","",""
"uuid:5e48b1c9-f4d3-4f59-9831-529e0d7c91d6","http://resolver.tudelft.nl/uuid:5e48b1c9-f4d3-4f59-9831-529e0d7c91d6","A framework for analysing blockchain technology adoption: Integrating institutional, market and technical factors","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth (Bradford University); Ismagilova, Elvira (Bradford University); Sivarajah, Uthayasankar (Bradford University); Irani, Zahir (Bradford University)","","2020","The adoption of blockchain technologies require the consideration of a broad range of factors, over and above the predominantly technology focus of most current work. Whilst scholarly literature on blockchain technology is only beginning to emerge, majority are focused on the technicalities of the technology and tend to ignore the organizational complexities of adopting the technology. Drawing from a focused review of literature, this paper proposed a conceptual framework for adoption of blockchain technology capturing the complex relationships between institutional, market and technical factors. The framework highlights that varying outcomes are possible, and the change process is focal as this shapes the form blockchain applications take. Factors presented in the framework (institutional, market and technical) interact and mutually influence each other. The proposed framework can be used by organisations as a reference point for adopting blockchain applications and by scholars to expand, refine and evaluate research into blockchain technology.","Adoption; Blockchain technology; Diffusion; Distributed ledger; Intermediaries; Markets; Trust","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-09-01","","","Information and Communication Technology","","",""
"uuid:ec103587-6165-4f5e-ba92-8a1040893aef","http://resolver.tudelft.nl/uuid:ec103587-6165-4f5e-ba92-8a1040893aef","Victimization and Its Consequences for Well-Being: A Between- and Within-Person Analysis","Janssen, H.J. (TU Delft Urban Studies); Oberwittler, Dietrich (Max-Planck-Institut für ausländisches und internationales Strafrecht); Koeber, Goeran (University Medical Center Freiburg)","","2020","Objectives
We examined the effects of victimization on several aspects of well-being in a longitudinal study of a general population sample. Previous research has often been inconclusive, as it was largely based on cross-sectional data and prone to problems of unobserved heterogeneity and selection bias. We examined both between-person differences and within-person changes in well-being in relation to property and violent victimization. We investigated psychological and behavioral dimensions of well-being, controlling for and comparing with the effects of other negative life events.
Methods
We used data from a two-wave panel survey of 2928 respondents aged 25–89 nested in 140 neighborhoods in two large German cities. We applied random-effects modeling to separate between-person from within-person effects.
Results
The within-person detrimental effects of victimization were considerably smaller than between-person effects, which reflected preexisting, time-stable factors that distinguish individuals who have experienced victimization from individuals who have not. Detrimental effects concerned fear of crime, generalized trust, and neighborhood satisfaction, but did not extend to emotional well-being or life satisfaction, in contrast to other negative life events. We found empirical support both for adaptation (‘recovery’) effects as well as for anticipation effects. Violent victimization had stronger effects than property victimization, and victimization near the home had stronger effects than victimization elsewhere.
Conclusion
The findings indicate that violent victimization has palpable detrimental effects on security perceptions, trust and neighborhood satisfaction—but not on emotional well-being and life satisfaction—and that individuals largely recover from the victimization within 18 months.","Between-within-person analysis; Fear of crime; Victimization; Violence; Well-being","en","journal article","","","","","","","","","","","Urban Studies","","",""
"uuid:59edf963-b722-4eff-b839-01a149aaafa7","http://resolver.tudelft.nl/uuid:59edf963-b722-4eff-b839-01a149aaafa7","Citizen Engagement with Open Government Data: Lessons learned from Indonesia’s Presidential Election","Purwanto, A. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Purpose: Citizen engagement is key to the success of many Open Government Data (OGD) initiatives. However, not much is known regarding how this type of engagement emerges. This study aims to investigate the necessary conditions for the emergence of citizen-led engagement with OGD and to identify which factors stimulate this type of engagement. Design/methodology/approach: First, the authors created a systematic overview of the literature to develop a conceptual model of conditions and factors of OGD citizen engagement at the societal, organizational and individual level. Second, the authors used the conceptual model to systematically study citizens’ engagement in the case of a particular OGD initiative, namely, the digitization of presidential election results data in Indonesia in 2014. The authors used multiple information sources, including interviews and documents, to explore the conditions and factors of OGD citizen-led engagement in this case. Findings: From the literature the authors identified five conditions for the emergence of OGD citizen-led engagement as follows: the availability of a legal and political framework that grants a mandate to open up government data, sufficient budgetary resources allocated for OGD provision, the availability of OGD feedback mechanisms, citizens’ perceived ease of engagement and motivated citizens. In the literature, the authors found six factors contributing to OGD engagement as follows: democratic culture, the availability of supporting institutional arrangements, the technical factors of OGD provision, the availability of citizens’ resources, the influence of social relationships and citizens’ perceived data quality. Some of these conditions and factors were found to be less important in the studied case, namely, citizens’ perceived ease of engagement and citizens’ perceived data quality. Moreover, the authors found several new conditions that were not mentioned in the studied literature, namely, citizens’ sense of urgency, competition among citizen-led OGD engagement initiatives, the diversity of citizens’ skills and capabilities and the intensive use of social media. The difference between the conditions and factors that played an important role in the case and those derived from the literature review might be because of the type of OGD engagement that the authors studied, namely, citizen-led engagement, without any government involvement. Research limitations/implications: The findings are derived using a single case study approach. Future research can investigate multiple cases and compare the conditions and factors for citizen-led engagement with OGD in different contexts. Practical implications: The conditions and factors for citizen-led engagement with OGD have been evaluated in practice and discussed with public managers and practitioners through interviews. Governmental organizations should prioritize and stimulate those conditions and factors that enhance OGD citizen engagement to create more value with OGD. Originality/value: While some research on government-led engagement with OGD exists, there is hardly any research on citizen-led engagement with OGD. This study is the first to develop a conceptual model of necessary conditions and factors for citizen engagement with OGD. Furthermore, the authors applied the developed multilevel conceptual model to a case study and gathered empirical evidence of OGD engagement and its contributions to solving societal problems, rather than staying at the conceptual level. This research can be used to investigate citizen engagement with OGD in other cases and offers possibilities for systematic cross-case lesson-drawing.","Citizens; Conditions; Engagement; Factors; Open data; Open government data; Use","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:83198e66-71ee-4cd1-8baf-699c84aa1884","http://resolver.tudelft.nl/uuid:83198e66-71ee-4cd1-8baf-699c84aa1884","An agent-based empirical game theory approach for airport security patrols","Janssen, S.A.M. (TU Delft Air Transport & Operations); Matias, Diogo (Student TU Delft); Sharpanskykh, Alexei (TU Delft Air Transport & Operations)","","2020","Airports are attractive targets for terrorists, as they are designed to accommodate and process large amounts of people, resulting in a high concentration of potential victims. A popular method to mitigate the risk of terrorist attacks is through security patrols, but resources are often limited. Game theory is commonly used as a methodology to find optimal patrol routes for security agents such that security risks are minimized. However, game-theoretic models suffer from payoff uncertainty and often rely solely on expert assessment to estimate game payoffs. Experts cannot incorporate all aspects of a terrorist attack in their assessment. For instance, attacker behavior, which contributes to the game payoff rewards, is hard to estimate precisely. To address this shortcoming, we proposed a novel empirical game theory approach in which payoffs are estimated using agent-based modeling. Using this approach, we simulated different attacker and defender strategies in an agent-based model to estimate game-theoretic payoffs, while a security game was used to find optimal security patrols. We performed a case study at a regional airport, and show that the optimal security patrol is non-deterministic and gives special emphasis to high-impact areas, such as the security checkpoint. The found security patrol routes are an improvement over previously found security strategies of the same case study.","Agent-based modeling; Airport security; Empirical game theory; Patrolling games; Security game","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:af1f6d8c-05c2-479b-8b0e-a212121e2f29","http://resolver.tudelft.nl/uuid:af1f6d8c-05c2-479b-8b0e-a212121e2f29","Structural changes driven by e-petitioning technology: changing the relationship between the central government and local governments","Karkin, N. (TU Delft Information and Communication Technology; Pamukkale University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","e-Petitioning is a type of information and communication technology for development that can be used by citizens to express their voices in society. Although much work is focused on government-citizen relationships, little is known about whether and, if so, how e-petitions technology might result in structural transformations in public administration. In this study, we investigated the effects of an e-petitioning system in the Turkish public administration from neo-institutional and transaction cost perspectives. In contrast to the expectation of reducing transaction costs due to ICTs use, the transaction costs increased. The changes have further strengthened the central government by transforming the current tutelary relationship into a more hierarchical structure. The change is not driven by lowering transaction costs; instead, the change mirrors the power structures. The use of technology changed the structures in such a way that political power structures are reinforced while empowering the citizens to make their voices heard.","e-Petition; ICT4D; intragovernmental relationships; neo-institutional theory; public input; transaction cost theory","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-12-15","","","Information and Communication Technology","","",""
"uuid:d05fad8f-3488-49ac-bbec-d06bbfb2ffbc","http://resolver.tudelft.nl/uuid:d05fad8f-3488-49ac-bbec-d06bbfb2ffbc","Understanding the impact of digital service failure on users: Integrating Tan's failure and DeLone and McLean's success model","Mustafa, Syed Ziaul (Indian Institute of Technology Delhi); Kar, Arpan Kumar (Indian Institute of Technology Delhi); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Although information systems (IS) success has been given much attention in IS literature, failure has received lesser attention. This study empirically validates a model of digital service failure for consumers by integrating three dimensions from Tan's failure model and one dimension from DeLone and Mclean's Information Success model. The factors have been mapped to Expectation Disconfirmation Theory (EDT). Experiential survey approach has been used to collect primary data from information systems users who have experienced digital service failure. Structural equation modeling (SEM) has been used for model testing and validation to measure the impact of information, system, functional and service failure of digital service on end users. The findings suggests that information, functional, system and service failure has an impact on the consumers through the outcome, process, cost and user satisfaction of digital services.","Digital services; Expectation disconfirmation theory; Information systems failure; Information systems success; Service failure","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-10-02","","","Information and Communication Technology","","",""
"uuid:16de379a-80d2-4a6a-acd2-eeb3e6293996","http://resolver.tudelft.nl/uuid:16de379a-80d2-4a6a-acd2-eeb3e6293996","Citizens’ Trust in Open Government Data: A Quantitative Study about the Effects of Data Quality, System Quality and Service Quality","Purwanto, A. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Eom, Seok-Jin (editor); Lee, Jooho (editor)","2020","Previous research assumes that poor quality of Open Government Data (OGD), OGD portals, and the services provided for OGD may result in reduced trust of citizens in OGD. However, studies that empirically test this assumption are scarce. Using the Information Systems (IS) Success Model as a theoretical basis, this study aims to examine the effects of data quality, system quality, and service quality on citizens’ trust in OGD.We used Structural Equation Modeling (SEM) to analyze the 200 responses to our online questionnaire. We found that trust in OGD can be predicted by citizens’ perceptions of OGD system quality and service quality. Furthermore, citizens’ perception of service quality positively influences their perceptions of data and system quality, whereas citizens’ perception of system quality positively influences their perception of data quality. This study is among the first that quantitatively examines the effects of data quality, service quality, and system quality on citizen’s trust in OGD. It contributes to the scientific literature by providing an operationalization of elements of the IS Success Model in the context of OGD and by developing and applying a model of factors influencing citizen’s trust in OGD. While previous research finds that perceived data quality is the most crucial driver for trust in OGD, our study finds that citizens’ perception of OGD service quality is a more important driver for trust in OGD. With regard to the practical contributions of this study, open data policymakers should be aware that citizens’ perceptions on data quality can be greatly improved when appropriate human services are provided (e.g., designated civil servants offering support or help to data users) in addition to the provision of OGD portal functionalities (e.g., data visualization and comparison tools).","Citizen engagement; Data quality; Information Systems Success Model; Open Government Data; Service quality; Structural Equation Modeling; Systems quality; Trust","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-12-01","","","Information and Communication Technology","","",""
"uuid:a0f62102-209d-4d9e-b167-18c7dea45e23","http://resolver.tudelft.nl/uuid:a0f62102-209d-4d9e-b167-18c7dea45e23","Towards a framework for cloud computing use by governments: Leaders, followers and laggers","Pinheiro Junior, Luiz (EAESP/FGV); Alexandra Cunha, Maria (EAESP/FGV); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Matheus, R. (TU Delft Information and Communication Technology)","Eom, Seok-Jin (editor); Lee, Jooho (editor)","2020","There are large varieties of governmental organizations using clouds in different ways. The purpose of this article is to explore and classify the types of public organizations using cloud computing. This will help to improve our understanding of cloud adoption and use by governments. For this, a systematic review of literature on cloud government (CloudGov) was performed by searching for articles in several databases. The review resulted into the main elements of the framework for classifying cloud use. In addition, using diffusion of innovation and institutional theory a categorization of public organizations was made. When applying the CloudGov framework empirically in government organizations, we identified three types of organizations: Leaders, Followers and Laggers. The types differ in various ways including their technology expertise, attitude towards innovation and level of political support. In further research, we recommend investigating which drivers influence the type of CloudGov users and generalize the framework to other contexts.","Adoption; Cloud Computing; CloudGov; Framework; Government; Use","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-12-02","","","Information and Communication Technology","","",""
"uuid:f71593f9-7c76-450b-a75f-def151b21be8","http://resolver.tudelft.nl/uuid:f71593f9-7c76-450b-a75f-def151b21be8","Agile and adaptive governance in crisis response: Lessons from the COVID-19 pandemic","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); van der Voort, H.G. (TU Delft Organisation & Governance)","","2020","Countries around the world have had to respond to the COVID-19 outbreak with limited information and confronting many uncertainties. Their ability to be agile and adaptive has been stressed, particularly in regard to the timing of policy measures, the level of decision centralization, the autonomy of decisions and the balance between change and stability. In this contribution we use our observations of responses to COVID-19 to reflect on agility and adaptive governance and provide tools to evaluate it after the dust has settled. Whereas agility relates mainly to the speed of response within given structures, adaptivity implies system-level changes throughout government. Existing institutional structures and tools can enable adaptivity and agility, which can be complimentary approaches. However, agility sometimes conflicts with adaptability. Our analysis points to the paradoxical nature of adaptive governance. Indeed, successful adaptive governance calls for both decision speed and sound analysis, for both centralized and decentralized decision-making, for both innovation and bureaucracy, and both science and politics.","Adaptive governance; Adaptivity; Agile governance; Agile organization; COVID-19; Pandemic; Response; SARS-CoV-2","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:27963504-7ac9-4db4-8311-75f5789fcad0","http://resolver.tudelft.nl/uuid:27963504-7ac9-4db4-8311-75f5789fcad0","“Desigrated”-Desiccant Integrated Façade for the Hot-Humid Climate of Bangkok, Thailand","Suwannapruk, N. (Student TU Delft); Prieto Hoces, A.I. (TU Delft Design of Constrution); Janssen, C.J. (TU Delft Building Physics)","","2020","“Desigrated” presented an attempt to integrate heat prevention strategies with low-ex cooling technologies, namely the desiccant and M-cycle evaporative cooling technology, in the form of a façade system for high-rise office buildings. The project targets to provide an alternative cooling solution for the hot and humid climate context of Bangkok. The results from experiments by various researchers are used as assumptions in developing the system, which was then evaluated through numerical methods and dynamic simulations. Being one of the prominent dehumidification technologies, a composite silica gel heat exchanger (CCHE) was implemented as the primary part of the façade system, while the M-cycle technology would also be implemented as a secondary cooling technique to cool down the supply air. The evaluation shows a promising result with up to 36% energy consumption reduction in comparison with the conventional cooling system, presenting itself as a transitioning tool in order to replace refrigerant cooling.","Bangkok; Building services; Cooling; Desiccants; Evaporative cooling; Façade; Heat exchanger; Hot-humid; Low-exergy; Solar cooling","en","journal article","","","","","","","","","","","Design of Constrution","","",""
"uuid:5c3d2f68-7d34-4794-829b-cd3013429332","http://resolver.tudelft.nl/uuid:5c3d2f68-7d34-4794-829b-cd3013429332","Joint Blind Calibration and Time-Delay Estimation for Multiband Ranging","Kazaz, T. (TU Delft Signal Processing Systems); Coutino, Mario (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); van der Veen, A.J. (TU Delft Signal Processing Systems)","","2020","In this paper, we focus on the problem of blind joint calibration of multiband transceivers and time-delay (TD) estimation of multipath channels. We show that this problem can be formulated as a particular case of covariance matching. Although this problem is severely ill-posed, prior information about radio-frequency chain distortions and multipath channel sparsity is used for regularization. This approach leads to a biconvex optimization problem, which is formulated as a rank-constrained linear system and solved by a simple group Lasso algorithm. Numerical experiments show that the proposed algorithm provides better calibration and higher resolution for TD estimation than current state-of-the-art methods.","blind calibration; localization; multipath estimation; ranging; sparse covariance matching; time-of-arrival estimation","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-11-14","","","Signal Processing Systems","","",""
"uuid:0c115031-b233-477a-a317-d372c49f2dd4","http://resolver.tudelft.nl/uuid:0c115031-b233-477a-a317-d372c49f2dd4","Data governance: Organizing data for trustworthy Artificial Intelligence","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Brous, P.A. (TU Delft Information and Communication Technology); Estevez, Elsa (UNS-CONICET San Andres 800); Barbosa, Luis S. (University of Minho); Janowski, Tomasz (Politechnika Gdanska; Danube University Krems)","","2020","The rise of Big, Open and Linked Data (BOLD) enables Big Data Algorithmic Systems (BDAS) which are often based on machine learning, neural networks and other forms of Artificial Intelligence (AI). As such systems are increasingly requested to make decisions that are consequential to individuals, communities and society at large, their failures cannot be tolerated, and they are subject to stringent regulatory and ethical requirements. However, they all rely on data which is not only big, open and linked but varied, dynamic and streamed at high speeds in real-time. Managing such data is challenging. To overcome such challenges and utilize opportunities for BDAS, organizations are increasingly developing advanced data governance capabilities. This paper reviews challenges and approaches to data governance for such systems, and proposes a framework for data governance for trustworthy BDAS. The framework promotes the stewardship of data, processes and algorithms, the controlled opening of data and algorithms to enable external scrutiny, trusted information sharing within and between organizations, risk-based governance, system-level controls, and data control through shared ownership and self-sovereign identities. The framework is based on 13 design principles and is proposed incrementally, for a single organization and multiple networked organizations.","AI; Algorithmic governance; Artificial Intelligence; Big data; Data governance; Information sharing; Trusted frameworks","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-12-21","","","Information and Communication Technology","","",""
"uuid:13bb1ddc-a508-4790-b460-d1ae12191d72","http://resolver.tudelft.nl/uuid:13bb1ddc-a508-4790-b460-d1ae12191d72","Agent-based vulnerability assessment at airport security checkpoints: A case study on security operator behavior","Janssen, S.A.M. (TU Delft Air Transport & Operations); van den Berg, Arjan (Student TU Delft); Sharpanskykh, Alexei (TU Delft Air Transport & Operations)","","2020","Despite enormous investments in airport security, terrorists have been able to find and exploit vulnerabilities at security checkpoints. Existing vulnerability assessment methodologies struggle with accounting for human behavior, and agent-based modelling forms a promising technique to overcome this limitation. This paper investigated how the decision-making and performance of human operators can be taken into account while assessing vulnerability at an airport security checkpoint. To this end, an agent-based model was designed, in which the performance of security operators was modelled using a functional state model, while decision making was modelled using decision field theory. Passengers and an attacker that brings a weapon to the security checkpoint were also explicitly modelled as agents. Simulation results indicate that the highest skilled operators outperformed their lowest skilled counterparts on analyzing X-ray images, but performed worse on both searching luggage and performing patdowns. Furthermore, results showed that a high focus on speed of security operators leads to a decrease in luggage searches and therefore increased vulnerability. More work is needed to calibrate and validate the simulation results, but initial results are promising. The agent-based model can be used by airport regulators and managers to understand the workings of their security checkpoint better and ultimately to reduce vulnerabilities.","Agent-based modelling; Human decision making; Human performance; Security; Vulnerability","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:dcaf37f0-5c4d-45bc-b702-317592dc4e95","http://resolver.tudelft.nl/uuid:dcaf37f0-5c4d-45bc-b702-317592dc4e95","Exploring Causal Factors Influencing Enterprise Architecture Failure","Gong, Yiwei (Wuhan University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Sharma, Sujeet K. (editor); Dwivedi, Yogesh K. (editor); Metri, Bhimaraya (editor); Rana, Nripendra P. (editor)","2020","Organizations have adopted Enterprise Architecture (EA) for managing their IT-landscape and ensuring coherence among projects and activities. There is much work about approaches, methods, and tools for EA based on the assumption that their use will create business value. However, the failure of many EA efforts results in the need to investigate the factors influencing EA failure in practice. In this paper, we used a literature review to identify ten EA failure factors. Then we employed the grey-DEMATEL method to explore and analyze the influence of the ten EA failure factors based on the input of five EA experts. The result shows that failure factors are not in isolation, and they can be divided into either causal or effect factors. The factors do not have equal importance but differ in the levels of influence. For the causal factors, the ranking from most to least important is the inability to handle complexity, lack of proven EA methodology, lack of EA knowledge, lack of communication, and lack of tools. For the effect factors, the factors are a lack of support, too high effort, lack of motivation, parallel processes, and unused artifacts. We recommend practitioners to pay more attention to the five causal factors in their EA efforts. Further research is needed to generalize the findings, to understand the dependencies among factors, and to take into account situational dependency of EA failure.","Enterprise Architecture; Grey-DEMATEL; IT architecture; IT failure; Multi-criteria decision-making; Value","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-06-11","","","Information and Communication Technology","","",""
"uuid:b3b8fefe-c50b-40b2-b14b-c6db0edc7a92","http://resolver.tudelft.nl/uuid:b3b8fefe-c50b-40b2-b14b-c6db0edc7a92","Citizen Engagement With Open Government Data: A Systematic Literature Review of Drivers and Inhibitors","Purwanto, A. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Citizen engagement with open government data (OGD) can enhance the effectiveness of governments and improve not only the quality of public policy making but also public services provisioning and ability to address societal problems. Although previous research gives insight into citizen’s drivers and inhibitors for engaging with OGD, they have not yet been integrated into a single conceptual model. The aims of this study are twofold: 1) to systematically review the literature on individual citizens’ drivers and inhibitors for engaging with OGD and 2) to develop a conceptual model of citizen engagement with OGD based on the findings of the literature review. To attain this objective, the authors systematically analyzed 52 papers published in the period 2009-2019. Seven categories of drivers of citizen engagement are identified: citizen’s profile, personal, performance-related, economic, social, technical, and political. Three groups of inhibitors are also identified: citizen’s profile, technical, and political. This study helps in understanding how the engagement of citizens can be enhanced.","Citizen Engagement; Conceptual Model; Factors; Literature Review; OGD; Open Government Data","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:3e3b5ad1-d6cf-4b8e-ae78-6c6c3fc3632d","http://resolver.tudelft.nl/uuid:3e3b5ad1-d6cf-4b8e-ae78-6c6c3fc3632d","A systematic literature review on the use of games for attitude change: Searching for factors influencing civil servants' attitudes","Kleiman, F. (TU Delft Information and Communication Technology); Meijer, Sebastiaan (KTH Royal Institute of Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Governments are increasingly using games for civic engagement, decision making, and education. Serious gaming is a type of game that has often been advocated as a means for changing the attitude of its players and can be used for changing the attitude of civil servants. However, the relationship between games and attitude change in civil servants remains unexplored. This paper aims at identifying factors leading to attitude change of civil servants. As hardly any paper is focused on civil servants' attitude change through games, the authors broaden their research to attitude change through games in general. Out of 483 documents, 19 reference papers were analyzed in detail. Eighty-one games were found, and more than 13 different theories were identified containing 30 different influencing factors, which were found mostly to be unrelated and context-dependent. The conceptual dispersion between studies indicates that the resulting overview of factors is a first step towards creating a uniform theory. The results can help governments to design better games.","Attitude change; Civil servant; E-government; Game design; Gaming","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-06-30","","","Information and Communication Technology","","",""
"uuid:955465ac-1df4-4162-a6a3-6ccb524261ca","http://resolver.tudelft.nl/uuid:955465ac-1df4-4162-a6a3-6ccb524261ca","Stage Models for Moving from E-Government to Smart Government","Lemke, Florian (Capgemini); Taveter, Kuldar (Tallinn University of Technology); Erlenheim, Regina (Tallinn University of Technology); Pappel, Ingrid (Tallinn University of Technology); Draheim, Dirk (Tallinn University of Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Chugunov, Andrei (editor); Trutnev, Dmitrii (editor); Khodachek, Igor (editor); Misnikov, Yuri (editor)","2020","The emergence of super-applications is a complete game changer in how future governments will deliver e-services and interact with their citizens. With respect to this, the scope of currently established e-government stage models is exhausted. Therefore, this article proposes a “provident stage” as an extension of the Layne and Lee stage model, that adequately addresses the rapid technological development and evolvement of mobile- and smart-government solutions. We argue that super-applications can drive the transformation of e-government towards a yet unforeseen quality level: smart government. This article discusses that transition process, the influence of mobile government solutions in this as well as emerging citizens’ expectations for modern government service delivery.","Digital government; E-government (eGov); Provident services; Smart government (sGov); Stage models; Super-applications; WeChat","en","conference paper","SpringerOpen","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-07-23","","","Information and Communication Technology","","",""
"uuid:ebf9eaaf-e2a1-4912-9834-dbb373e6e16d","http://resolver.tudelft.nl/uuid:ebf9eaaf-e2a1-4912-9834-dbb373e6e16d","Will Algorithms Blind People? The Effect of Explainable AI and Decision-Makers’ Experience on AI-supported Decision-Making in Government","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Hartog, M.W. (TU Delft Information and Communication Technology); Matheus, R. (TU Delft Information and Communication Technology); Ding, Aaron Yi (TU Delft Information and Communication Technology); Kuk, George (Nottingham Trent University)","","2020","Computational artificial intelligence (AI) algorithms are increasingly used to support decision making by governments. Yet algorithms often remain opaque to the decision makers and devoid of clear explanations for the decisions made. In this study, we used an experimental approach to compare decision making in three situations: humans making decisions (1) without any support of algorithms, (2) supported by business rules (BR), and (3) supported by machine learning (ML). Participants were asked to make the correct decisions given various scenarios, while BR and ML algorithms could provide correct or incorrect suggestions to the decision maker. This enabled us to evaluate whether the participants were able to understand the limitations of BR and ML. The experiment shows that algorithms help decision makers to make more correct decisions. The findings suggest that explainable AI combined with experience helps them detect incorrect suggestions made by algorithms. However, even experienced persons were not able to identify all mistakes. Ensuring the ability to understand and traceback decisions are not sufficient for avoiding making incorrect decisions. The findings imply that algorithms should be adopted with care and that selecting the appropriate algorithms for supporting decisions and training of decision makers are key factors in increasing accountability and transparency.","accountability; AI; algorithmic governance; artificial intelligence; data-driven government; decision making; e-government; experiment; transparency; XAI","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:2c6ff428-4f27-43eb-bd01-265196086e05","http://resolver.tudelft.nl/uuid:2c6ff428-4f27-43eb-bd01-265196086e05","Preface, Electronic Government","Pereira, Gabriela Viale (Danube University Krems); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Lee, Habin (Brunel University); Lindgren, Ida (Linköping University); Bolívar, Manuel Pedro Rodríguez (Universidad de Granada); Scholl, Hans Jochen (University of Washington); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology)","","2020","","","en","contribution to periodical","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-03-30","","","Information and Communication Technology","","",""
"uuid:53d72a5c-71df-4e3e-99bc-38c1943078aa","http://resolver.tudelft.nl/uuid:53d72a5c-71df-4e3e-99bc-38c1943078aa","Combining Networks Using Cherry Picking Sequences","Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (Centrum Wiskunde & Informatica (CWI)); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization)","Martín-Vide, Carlos (editor); Vega-Rodríguez, Miguel A. (editor); Wheeler, Travis (editor)","2020","Phylogenetic networks are important for the study of evolution. The number of methods to find such networks is increasing, but most such methods can only reconstruct small networks. To find bigger networks, one can attempt to combine small networks. In this paper, we study the Network Hybridization problem, a problem of combining networks into another network with low complexity. We characterize this complexity via a restricted problem, Tree-child Network Hybridization, and we present an FPT algorithm to efficiently solve this restricted problem.","FPT algorithms; Network hybridization; Phylogenetic networks; Tree-child networks","en","conference paper","Springer","","","","","Accepted author manuscript","","2021-04-03","","","Discrete Mathematics and Optimization","","",""
"uuid:58526e2b-537b-4ec6-9dba-c3b95ec6bad7","http://resolver.tudelft.nl/uuid:58526e2b-537b-4ec6-9dba-c3b95ec6bad7","Aligning stakeholder interests, governance requirements and blockchain design in business and government information sharing","van Engelenburg, S.H. (TU Delft Organisation & Governance); Rukanova, B.D. (TU Delft Information and Communication Technology); Hofman, Wout (TNO); Ubacht, J. (TU Delft Information and Communication Technology); Tan, Y. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Pereira, Gabriela Viale (editor); Janssen, Marijn (editor); Lee, Habin (editor); Lindgren, Ida (editor); Bolívar, Manuel Pedro Rodríguez (editor); Scholl, Hans Jochen (editor); Zuiderwijk, Anneke (editor)","2020","Governance requirements for systems supporting information sharing be-tween businesses and government organisations (B&G) are determined by a high variety of stakeholders with often conflicting interests. These conflict-ing interests can hamper the introduction and scaling-up of ICT-innovations that change their roles and authorities. We address one such innovation: the introduction of blockchain technologies in the B&G context. Who can gov-ern data and the system depends on several elements of the design of a blockchain-based system, particularly the data structure, consensus mecha-nism and network topology. Design choices regarding these elements affect who can make decisions and hence we call them blockchain control points. These control points require an explicit and well-understood relationship be-tween the design decisions and the interests of stakeholders. Yet, the litera-ture on blockchain technology and governance does not offer such insight. Therefore, we developed a framework to assess the alignment between stakeholders interest and blockchain design choices. This framework consists of three views and their interrelationships, 1) a stakeholder view providing insight into the tensions between stakeholder’s interests and governance re-quirements, 2), a governance view on the rights concerning the data and the system, and 3) a blockchain control view describing how design decisions on the control points affect whether governance requirements are met and how parties can exercise their rights. Making these links explicit enables an un-derstanding of how technical design choices can trigger organizational dy-namics from the stakeholder view and vice versa. Based on the framework we formulate a research agenda concerning blockchain design choices and governance.","Access control; Blockchain technology; Business; Consensus mechanism; Distributed ledger technology; Governance; Government; Information sharing","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-02-24","","","Organisation & Governance","","",""
"uuid:e012e647-1d36-40a3-b1ce-20f4c80ba886","http://resolver.tudelft.nl/uuid:e012e647-1d36-40a3-b1ce-20f4c80ba886","Polynomial-Time Algorithms for Phylogenetic Inference Problems Involving Duplication and Reticulation","van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization); Zeh, Norbert (Dalhousie University)","","2020","A common problem in phylogenetics is to try to infer a species phylogeny from gene trees. We consider different variants of this problem. The first variant, called Unrestricted Minimal Episodes Inference, aims at inferring a species tree based on a model with speciation and duplication where duplications are clustered in duplication episodes. The goal is to minimize the number of such episodes. The second variant, Parental Hybridization, aims at inferring a species network based on a model with speciation and reticulation. The goal is to minimize the number of reticulation events. It is a variant of the well-studied Hybridization Number problem with a more generous view on which gene trees are consistent with a given species network. We show that these seemingly different problems are in fact closely related and can, surprisingly, both be solved in polynomial time, using a structure we call 'beaded trees'. However, we also show that methods based on these problems have to be used with care because the optimal species phylogenies always have a restricted form. To mitigate this problem, we introduce a new variant of Unrestricted Minimal Episodes Inference that minimizes the duplication episode depth. We prove that this new variant of the problem can also be solved in polynomial time.","duplication; gene trees; Hybridization Number problem; inference; Phylogenetics; polynomial-time algorithm","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Discrete Mathematics and Optimization","","",""
"uuid:814e81f6-8bac-431b-8a44-90692fdbe9ad","http://resolver.tudelft.nl/uuid:814e81f6-8bac-431b-8a44-90692fdbe9ad","Input-Output Modeling for Smart City Development","Noori, Negar (Erasmus Universiteit Rotterdam); de Jong, Martin (Erasmus Universiteit Rotterdam; Fudan University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Schraven, D.F.J. (TU Delft Integral Design & Management); Hoppe, T. (TU Delft Organisation & Governance)","","2020","While many national and local governments in the world are placing their bets on smart city development in countering challenges such as climate change, air pollution, and congestion, few know exactly how to develop them in practice. A high and rising number of publications has appeared addressing the concept of “smart city,” but not many address its implementation. This paper aims at a conceptual understanding of the smart city by describing its various facets and using them to develop an Input-Output model helping policymakers and analysts make informed design choices. Using this model allows them to further their conceptual understanding of smart cities, envisage design choices they will face during planning and implementation, and help them to understand the impact of these choices. The model is illustrated by introducing the case of “Smart Dubai.” Overall, this paper provides enhanced understanding of smart city development processes. This can be used in decision-making processes.","design variables; implementation; input-output model; Smart city development; Smart Dubai","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:3c416e8e-3a2b-4129-9c2a-2629fd856763","http://resolver.tudelft.nl/uuid:3c416e8e-3a2b-4129-9c2a-2629fd856763","Quality of Care Perceived by Older Patients and Caregivers in Integrated Care Pathways With Interviewing Assistance From a Social Robot: Noninferiority Randomized Controlled Trial","Boumans, R.J.L. (Radboud Universiteit Nijmegen); van Meulen, Fokke (Eindhoven University of Technology; Kempenhaeghe Foundation); van Aalst, William (Radboud Universiteit Nijmegen); Albers, Joyce (Canisius Wilhelmina Ziekenhuis); Janssen, Marèse (Canisius Wilhelmina Ziekenhuis); Peters-Kop, Marieke (Canisius Wilhelmina Ziekenhuis); Huisman- de Waal, Getty (Radboud Universiteit Nijmegen); van de Poll, Alexandra (Canisius Wilhelmina Ziekenhuis); Hindriks, K.V. (TU Delft Interactive Intelligence; Vrije Universiteit Amsterdam); Neerincx, M.A. (TU Delft Interactive Intelligence); Olde Rikkert, Marcel (Radboud Universiteit Nijmegen)","","2020","Background: Society is facing a global shortage of 17 million health care workers, along with increasing health care demands from a growing number of older adults. Social robots are being considered as solutions to part of this problem. Objective: Our objective is to evaluate the quality of care perceived by patients and caregivers for an integrated care pathway in an outpatient clinic using a social robot for patient-reported outcome measure (PROM) interviews versus the currently used professional interviews. Methods: A multicenter, two-parallel-group, nonblinded, randomized controlled trial was used to test for noninferiority of the quality of care delivered through robot-assisted care. The randomization was performed using a computer-generated table. The setting consisted of two outpatient clinics, and the study took place from July to December 2019. Of 419 patients who visited the participating outpatient clinics, 110 older patients met the criteria for recruitment. Inclusion criteria were the ability to speak and read Dutch and being assisted by a participating health care professional. Exclusion criteria were serious hearing or vision problems, serious cognitive problems, and paranoia or similar psychiatric problems. The intervention consisted of a social robot conducting a 36-item PROM. As the main outcome measure, the customized Consumer Quality Index (CQI) was used, as reported by patients and caregivers for the outpatient pathway of care. Results: In total, 75 intermediately frail older patients were included in the study, randomly assigned to the intervention and control groups, and processed: 36 female (48%) and 39 male (52%); mean age 77.4 years (SD 7.3), range 60-91 years. There was no significant difference in the total patient CQI scores between the patients included in the robot-assisted care pathway (mean 9.27, SD 0.65, n=37) and those in the control group (mean 9.00, SD 0.70, n=38): P=.08, 95% CI -0.04 to 0.58. There was no significant difference in the total CQI scores between caregivers in the intervention group (mean 9.21, SD 0.76, n=30) and those in the control group (mean 9.09, SD 0.60, n=35): P=.47, 95% CI -0.21 to 0.46. No harm or unintended effects occurred. Conclusions: Geriatric patients and their informal caregivers valued robot-assisted and nonrobot-assisted care pathways equally.","integrated care pathway; noninferiority randomized controlled trial; quality of care; social robot","en","review","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:5232f256-762d-4968-8ccf-770b145db217","http://resolver.tudelft.nl/uuid:5232f256-762d-4968-8ccf-770b145db217","Changing civil servants’ behaviour concerning the opening of governmental data.: Evaluating the effect of a game by comparing civil servants’ intentions before and after a game intervention","Kleiman, F. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Meijer, Sebastiaan (KTH Royal Institute of Technology); Jansen, S.J.T. (TU Delft Housing Systems)","","2020","Open data policies are increasingly being adopted by governments. However, civil servants find it challenging to comply with open data policies. Gaming can help civil servants to practise opening data and can change their behaviour to support the opening of more data. In this article, the effect of playing a game is evaluated in an experiment in which several factors that influence the opening of data are compared before and after the game. The benefits appeared in unexpected ways and areas. Data management, privacy and security knowledge was transferred using the game, the perception of benefits showed significant changes, and behavioural intention was positively affected. Points for practitioners: Civil servants’ behaviour influences how public policies are enacted. The release of open data by governments is related by many as crucial for increasing public transparency and civic participation, and generating new economic opportunities. Games can influence the attitude of civil servants and, consequently, change governments’ decisions. Transferring knowledge and providing insights from new experiences can influence civil servants’ attitudes to open data. Moreover, governments can use games to influence civil servants’ attitudes.","behaviour; behavioural change; data management; freedom of information; gaming; open data; open government","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:26fcdaae-b1d3-4084-9ed3-ce02ac238913","http://resolver.tudelft.nl/uuid:26fcdaae-b1d3-4084-9ed3-ce02ac238913","Stakeholder tensions in decision-making for opening government data","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven)","Shishkov, Boris (editor); Shishkov, Boris (editor); Shishkov, Boris (editor)","2020","Various types of stakeholders are often involved in the process of deciding to open data. However, the influence of multiple–actors on the decision-making process is ill-understood. Stakeholders play different roles and have different interests in opening and analyzing datasets. The objective of this paper is to understand the influence of the stakeholder’s roles and their interests in the decision-making process to open data. The roles-interest grid method is used to determine the stakeholder’s concerns and how they influence the decision-making process to open data. In addition to stakeholder theory, we employ muddling through and bounded rationality theories to create a comprehensive analysis of the decision-making process. Stakeholders are found to be diverse, where some are proponents of opening data, and others are risk-averse and do not favor disclosing data. Stakeholder’s responsible for the actual opening of data are often focused on the risks resulting in a tension between the ambitions of politicians to open data, and the practices of administrators and decision-makers. Understanding the stakeholder’s roles and their tensions can help to ensure better decisions are made. We recommend creating incentives for generating shared objectives.","Bounded rationality; Decision-making; Interest; Muddling through; Open government data; Roles; Stakeholder","en","conference paper","SpringerOpen","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-01-07","","","Information and Communication Technology","","",""
"uuid:e6ccbd6e-e622-41d7-8910-0f21d11bea71","http://resolver.tudelft.nl/uuid:e6ccbd6e-e622-41d7-8910-0f21d11bea71","Relocatable Energy Storage Systems for Congestion Management","Janssen, Suzanne (Student TU Delft); Fu, A. (TU Delft Intelligent Electrical Power Grids); Cvetkovic, M. (TU Delft Intelligent Electrical Power Grids); Palensky, P. (TU Delft Intelligent Electrical Power Grids)","","2020","The rapid growth of rooftop solar, and on the rise technologies such as electric vehicles and heat pumps, is leading to congestion problems in low voltage distribution networks. If not dealt with, the congestion will prevent the installation of further units limiting the pace of the energy transition. Energy Storage Systems (ESS) are often seen as the technology with a high potential for congestion reduction. In this paper, we propose to use Relocatable Energy Storage System (RESS) fleet, to physically move the ESS throughout the distribution grid in an effort to alleviate congestion. The proposed method consists of two parts. First, a Mixed Integer Linear Program (MILP) is created to minimise the amount of RESS used and penalise displacement. Second, an algorithm with a Minimum Cost Maximum Matching objective is used to determine the dispatch of each individual RESS. The results on a CIGRE test system show the benefits of this method compared to stationary placed ESS in the grid.","Congestion Management; MILP; Energy Storage System","en","conference paper","IEEE","","","","","""Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.""","","2021-12-22","","","Intelligent Electrical Power Grids","","",""
"uuid:d1a5cdd3-e0f7-48f5-b3f7-34fbe9bedba2","http://resolver.tudelft.nl/uuid:d1a5cdd3-e0f7-48f5-b3f7-34fbe9bedba2","Verkeer in Nederland 2020","Beemster, Fieke (TNO); Hamers, Paco (TNO); Janssen, Robbert (TNO); ter Laag, Maya (TNO); Smit-Rietveld, Charlotte (TNO); Taale, Henk (TU Delft Transport and Planning); Wilmink, Isabel (TNO)","","2020","","","nl","report","TrafficQuest","","","","","","","","","","Transport and Planning","","",""
"uuid:30009029-c1b8-418c-a0a1-db19e3aeb12c","http://resolver.tudelft.nl/uuid:30009029-c1b8-418c-a0a1-db19e3aeb12c","Demonstration of a decimeter-level accurate hybrid optical-wireless terrestrial positioning system","Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Dun, H. (TU Delft Mathematical Geodesy and Positioning); Kazaz, T. (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning)","","2020","Global Navigation Satellite Systems (GNSS) are nowadays the most common solutions used to cope with Positioning-Navigation Timing (PNT) applications demands. GNSS are relied on in very diverse contexts and domains, yet the interest in systems such as GPS, GALILEO and Beidou is continuously increasing. However, and in particular for safety critical applications, GNSS are very vulnerable to unintentional interference and to intentional attacks such as spoofing or jamming. GNSS also provide degraded accuracy in dense multipath environments such as in urban canyons. Thus, solutions that could augment, back-up, complement, or surrogate GNSS, are actively sought after. In this paper, we introduce the concept of a hybrid optical wireless positioning system and present the initial experimental positioning results. The system uses optically distributed time and frequency reference signals for synchronization, and wideband radio signals for ranging. Initial results show that decimeter-level accuracy is obtained in urbanlike surroundings.","","en","conference paper","Institute of Navigation","","","","","Accepted author manuscript","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:3f33954e-75c7-4d0b-9bdb-becec6f0a51f","http://resolver.tudelft.nl/uuid:3f33954e-75c7-4d0b-9bdb-becec6f0a51f","Time Delay Estimation from Multiband Radio Channel Samples in Nonuniform Noise","Kazaz, T. (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); van der Veen, A.J. (TU Delft Signal Processing Systems)","","2020","The multipath radio channel is considered to have a non-bandlimited channel impulse response. Therefore, it is challenging to achieve high resolution time-delay (TD) estimation of multipath components (MPCs) from bandlimited observations of communication signals. It this paper, we consider the problem of multiband channel sampling and TD estimation of MPCs. We assume that the nonideal multi-branch receiver is used for multiband sampling, where the noise is nonuniform across the receiver branches. The resulting data model of Hankel matrices formed from acquired samples has multiple shift-invariance structures, and we propose an algorithm for TD estimation using weighted subspace fitting. The subspace fitting is formulated as a separable nonlinear least squares (NLS) problem, and it is solved using a variable projection method. The proposed algorithm supports high resolution TD estimation from an arbitrary number of bands, and it allows for nonuniform noise across the bands. Numerical simulations show that the algorithm almost attains the Cramér Rao Lower Bound, and it outperforms previously proposed methods such as multiresolution TOA, MI-MUSIC, and ESPRIT.","time-of-arrival; channel estimation; superresolution; sparse recovery; multiband sampling; cognitive radio","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-09-30","","","Signal Processing Systems","","",""
"uuid:9ab70889-98d5-430d-ac8c-de80ff0c07e5","http://resolver.tudelft.nl/uuid:9ab70889-98d5-430d-ac8c-de80ff0c07e5","Self-sovereign Identities for Fighting the Impact of COVID-19 Pandemic","Benchaya Gans, R (TU Delft Information and Communication Technology); Ubacht, J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Whereas part of the world can benefit from the wonders of digital technologies, undocumented migrants, asylum seekers,and refugees are facing the rough reality of being “invisible” in society and ignored by governments. During the COVID-19 pandemic, the economic impact of the closure of the service industry and the impossibility to keep most of the informal work they perform place them into a limbo without income and unemployment benefits. They are denied formal support because of the lack of a legally recognized identity. For this type of humanitarian support, contemporary identities can offer a way out. Self-sovereign identities (SSI) can provide individuals ownership over their data and the ability to share this with others. The essence is that the owner determines whom they share their identity data with. They have the sole ownership of the identity data. As such, an SSI ensures privacy for undocumented persons. This would allow to provide support to those who are left behind by a lack of formal identity. In this article, we explore the possibility of SSI to assist undocumented individuals throughout the pandemic times. SSI can be used to interact with undocumented workers and to share all kinds of identity data, such as sharing the attestation of COVID-19 tests or the ability to donate money to those who are illegal without sacrificing their identity.","blockchain; COVID 19; self-sovereign identity; privacy; undocumented persons","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:4aed6bc9-fd3e-4f97-bfd8-41ba1df13d04","http://resolver.tudelft.nl/uuid:4aed6bc9-fd3e-4f97-bfd8-41ba1df13d04","Digital platforms and responsible innovation: expanding value sensitive design to overcome ontological uncertainty","de Reuver, Mark (TU Delft Information and Communication Technology); Robbins-van Wynsberghe, A.L. (TU Delft Ethics & Philosophy of Technology; TU Delft Values Technology and Innovation); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); van de Poel, I.R. (TU Delft Values Technology and Innovation; TU Delft Ethics & Philosophy of Technology)","","2020","In this paper, we argue that the characteristics of digital platforms challenge the fundamental assumptions of value sensitive design (VSD). Traditionally, VSD methods assume that we can identify relevant values during the design phase of new technologies. The underlying assumption is that there is only epistemic uncertainty about which values will be impacted by a technology. VSD methods suggest that one can predict which values will be affected by new technologies by increasing knowledge about how values are interpreted or understood in context. In contrast, digital platforms exhibit a novel form of uncertainty, namely, ontological uncertainty: even with full information and overview, it cannot be foreseen what users or developers will do with digital platforms. Hence, predictions about which values are affected might not hold. In this paper, we suggest expanding VSD methods to account for value dynamism resulting from ontological uncertainty. Our expansions involve (1) extending VSD to the entire lifecycle of a platform, (2) broadening VSD through the addition of reflexivity, i.e. second-order learning about what values to aim at, and (3) adding specific tools of moral sandboxing and moral prototyping to enhance such reflexivity. While we illustrate our approach with a short case study about ride-sharing platforms such as Uber, our approach is relevant for other technologies exhibiting ontological uncertainty as well, such as machine learning, robotics and artificial intelligence.","Digital platforms; Emergent values; Responsible innovation; Value dynamism; Value sensitive design","en","journal article","","","","","","","","","","Values Technology and Innovation","Information and Communication Technology","","",""
"uuid:45e5917b-a26d-49bd-ba15-52b7853579f2","http://resolver.tudelft.nl/uuid:45e5917b-a26d-49bd-ba15-52b7853579f2","Single-crystal copper films on sapphire","Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering); van der Pers, N.M. (TU Delft (OLD) MSE-1); Hendrikx, R.W.A. (TU Delft (OLD) MSE-1); Bottger, A.J. (TU Delft (OLD) MSE-1); Kwakernaak, C. (TU Delft (OLD) MSE-1); Rieger, B. (TU Delft ImPhys/Computational Imaging; TU Delft ImPhys/Imaging Physics); Sluiter, M.H.F. (TU Delft (OLD) MSE-7)","","2020","Single-crystal copper films on sapphire have recently been reported upon in relation to graphene growth on these films. In the present paper the kinetics of the formation of single crystal copper films is investigated. We demonstrate the importance of heating the sapphire substrate in 1000 hPa oxygen, followed by a fast cooling prior to depositing the copper film. The importance of this treatment is tentatively explained by the dissolution of oxygen in sapphire and subsequent out-diffusion during recrystallization of the copper film to form a copper-oxide interface layer. Also, the importance of avoiding oxygen incorporation in the sputter deposited film is demonstrated.","Aluminum trioxide; Copper; Corundum; Dissolution; Oxygen; Sapphire; Single-crystal; Thin film","en","journal article","","","","","","","","","","ImPhys/Imaging Physics","Micro and Nano Engineering","","",""
"uuid:19d5c651-3fd2-4383-b1c3-c074e34a0745","http://resolver.tudelft.nl/uuid:19d5c651-3fd2-4383-b1c3-c074e34a0745","Blockchain for next generation services in banking and finance: cost, benefit, risk and opportunity analysis","Osmani, Mohamad (Qatar University); El-Haddadeh, Ramzi (Qatar University); Hindi, Nitham (Qatar University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth (Bradford University)","","2020","Purpose: The purpose of this paper is to help in providing a better understanding of the application of blockchain technology in the context of the banking and finance sectors. The aim is to outline blockchain's benefits, opportunities, costs, risks as well as challenges of the technology in the context of banking and finance services. Design/methodology/approach: Careful examination of the extant literature, including utilising relevant academic-based research databases has been carried out. It covered reviewing various research contributions published in peer-reviewed journals, academic reports, as well as technical reports to help in identifying related benefits, opportunities, costs and risks. Findings: The findings reveal that there are limited contributions in utilising blockchain in the banking and finance sectors when compared with other sectors. As such, the study highlighted the relevant perspective of benefits, opportunities, costs and risks within such sectors. Practical implications: This study helps in offering a focal point to banking and financial sector managers and decision-makers for realising the value and offerings of blockchain technology as well as associated strategies and programmes. Originality/value: This study highlights the need for a holistic understanding of the various aspects of cost, benefits, risk and opportunities to create blockchain applications that work for banking and finance sectors","Banking and finance; Benefit; Blockchain; Cost; Opportunity; Risk","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-12-30","","","Information and Communication Technology","","",""
"uuid:dea4863c-19dd-4e6e-9c4c-43a2f6f02c0f","http://resolver.tudelft.nl/uuid:dea4863c-19dd-4e6e-9c4c-43a2f6f02c0f","Sparse Signal Bands Selection for Precise Time-based Ranging in Terrestrial Positioning","Dun, H. (TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems)","","2020","Time-based ranging accuracy is inversely proportional to the signal bandwidth. A larger the signal bandwidth leads to a higher accuracy of time delay estimation, but more complex hardware is needed. Alternatively, we explore the idea of using multiple narrow signal bands (e.g., 10 MHz of each) to create a large virtual signal bandwidth, which maintains the spectral efficiency but largely improves the ranging accuracy. Considering the impact of multipath, the propagation delay of the LoS path is computed from the estimated channel impulse response (CIR). In this paper, we propose an approach to sparsely select signal bands for ranging and positioning based on convex optimization. The Cramér-Rao lower bound (CRLB) for the propagation delay and gain estimators, as a performance criterion, is employed in the constraint of the optimization. The CRLB is derived in a two-path channel, so that the accuracy and the correlation between the LoS path and the reflection are taken into account. Experiments are conducted in a laboratory environment to illustrate the proposed signal design methodology dedicated for ranging with a sub-decimeter accuracy.","convex optimization; Cramér-Rao lower bound; multipath channel; OFDM; ranging; time delay estimation","en","conference paper","IEEE","","","","","Accepted Author Manuscript","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:cb9989c6-b4bf-4caf-b862-680559353274","http://resolver.tudelft.nl/uuid:cb9989c6-b4bf-4caf-b862-680559353274","Effect of methanethiol on process performance, selectivity and diversity of sulfur-oxidizing bacteria in a dual bioreactor gas biodesulfurization system","Kiragosyan, K. (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research); Picard, Magali (Wetsus, Centre for Sustainable Water Technology; Eurofins Agroscience Services Chem SAS 75); Timmers, Peer H.A. (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research); Sorokin, Dimitry Y. (TU Delft BT/Environmental Biotechnology; Wetsus, Centre for Sustainable Water Technology; Russian Academy of Sciences); Klok, Johannes B.M. (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research; Paqell B.V.); Roman, Pawel (Wetsus, Centre for Sustainable Water Technology); Janssen, Albert J.H. (Wageningen University & Research; Shell Global Solutions International B.V.)","","2020","This study provides important new insights on how to achieve high sulfur selectivities and stable gas biodesulfurization process operation in the presence of both methanethiol and H2S in the feed gas. On the basis of previous research, we hypothesized that a dual bioreactor lineup (with an added anaerobic bioreactor) would favor sulfur-oxidizing bacteria (SOB) that yield a higher sulfur selectivity. Therefore, the focus of the present study was to enrich thiol-resistant SOB that can withstand methanethiol, the most prevalent and toxic thiol in sulfur-containing industrial off gases. In addition, the effect of process conditions on the SOB population dynamics was investigated. The results confirmed that thiol-resistant SOB became dominant with a concomitant increase of the sulfur selectivity from 75 mol% to 90 mol% at a loading rate of 2 mM S methanethiol day−1. The abundant SOB in the inoculum – Thioalkalivibrio sulfidiphilus – was first outcompeted by Alkalilimnicola ehrlichii after which Thioalkalibacter halophilus eventually became the most abundant species. Furthermore, we found that the actual electron donor in our lab-scale biodesulfurization system was polysulfide, and not the primarily supplied sulfide.","Alkalilimnicola ehrlichii; Microbial dynamics; Thioalkalibacter halophilus; Thioalkalivibrio sulfidiphilus; Thiol toxicity","en","journal article","","","","","","","","","","","BT/Environmental Biotechnology","","",""
"uuid:00a6259c-c0ea-4029-8f79-b56c0e0f65af","http://resolver.tudelft.nl/uuid:00a6259c-c0ea-4029-8f79-b56c0e0f65af","Future government data strategies: Data-driven enterprise or data steward?: Exploring definitions and challenges for the government as data enterprise","van Donge, W. (TU Delft Information and Communication Technology); Bharosa, Nitesh (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Eom, Seok-Jin (editor); Lee, Jooho (editor)","2020","Comparable to the concept of a data(-driven) enterprise, the concept of a ggovernment as data (-driven) enterprise' is gaining popularity as a data strategy. However, what it implies is unclear. The objective of this paper is to clarify the concept of the government as data (-driven) enterprise, and identify the challenges and drivers that shape future data strategies. Drawing on literature review and expert interviews, this paper provides a rich understanding of the challenges for developing sound future government data strategies. Our analysis shows that two contrary data strategies dominate the debate. On the one hand is the data-driven enterprise strategy that focusses on collecting and using data to improve or enrich government processes and services (internal orientation). On the other hand, respondents point to the urgent need for governments to take on data stewardship, so other parties can use data to develop value for society (external orientation). Since these data strategies are not mutually exclusive, some government agencies will attempt to combine them, which is very difficult to pull off. Nonetheless, both strategies demand a more data minded culture. Moreover, the successful implementation of either strategy requires mature data governance - something most organisations still need to master. This research contributes by providing more depth to these strategies. The main challenge for policy makers is to decide on which strategy best fits their agency's roles and responsibilities and develop a shared roadmap with the external actors while at the same time mature on data governance.","Data enterprise; Data governance; Data stewardship; Data-driven government; E-government","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-12-01","","","Information and Communication Technology","","",""
"uuid:88c020b3-a60a-4fc2-875d-e2b7493ac758","http://resolver.tudelft.nl/uuid:88c020b3-a60a-4fc2-875d-e2b7493ac758","Dosed carbon precipitation and graphene layer number control on nickel micro-electromechanical systems surfaces","Gkouzou, A. (TU Delft Micro and Nano Engineering; ASML); Janssen, G.C.A.M. (TU Delft Micro and Nano Engineering); van Spengen, W.M. (TU Delft Micro and Nano Engineering; Falco Systems)","","2020","In this paper, we report on the in situ synthesis of graphene layers by means of chemical vapor deposition (CVD), directly on nickel micro-electromechanical systems (MEMS) surfaces. We have developed MEMS structures of which the temperature can be increased locally by Joule heating while in a methane environment. For our MEMS structures, the thermal time constant is 28 μs. As a result, we have control over the carbon precipitation time, thereby governing how many graphene layers are formed. Bi-layer to multi-layer graphene was observed using micro-Raman spectroscopy, but not single-layer graphene, as it gives no Raman signal when coupled on a nickel surface. The corresponding precipitation control theory is also presented in this paper, in which we relate the out-diffusion of carbon atoms from the grains of the nickel structure to the resulting number of graphene layers. Our method provides regulated carbon segregation from nickel and allows a prescribed number of graphene layers to form by tuning the precipitation time. In this way, we enable the direct in situ synthesis of graphene locally on the top and sidewalls of nickel MEMS structures, so that e.g. such graphene-coated MEMS surfaces can contribute towards a promising solution against friction and wear for MEMS devices with sliding components.","Carbon precipitation; Chemical vapor deposition; Graphene; MEMS; Micro-Raman spectroscopy; Thermal time response","en","journal article","","","","","","","","","","","Micro and Nano Engineering","","",""
"uuid:579ea455-6769-4357-b6f8-c3e3cf481aca","http://resolver.tudelft.nl/uuid:579ea455-6769-4357-b6f8-c3e3cf481aca","Positioning in a Multipath Channel Using OFDM Signals with Carrier Phase Tracking","Dun, H. (TU Delft Geoscience and Remote Sensing; TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Geoscience and Remote Sensing; TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems)","","2020","In developing a high accuracy terrestrial radio navigation system, as a complement to a global navigation satellite system (GNSS), it is recognized that the performance of time delay estimation is proportional to, and thereby limited by, the signal bandwidth. Given a possibly narrow signal bandwidth, the central carrier phase can, alternatively, provide a better distance accuracy, though the central carrier phase cycle ambiguity should be resolved. In practice, the carrier phase may be perturbed by multipath. In this paper, considering an orthogonal frequency division multiplexing (OFDM) signal, we propose a two-step carrier phase estimation method to reduce the error introduced by multipath. First, the propagation delay of the LoS path is coarsely determined, then the carrier phase is estimated using the earlier determined coarse time delays. Furthermore, a positioning model only based on carrier phase estimates is presented in this paper. The proposed technique is evaluated by statistical analyses and a simulated OFDM-based terrestrial positioning system in different roadway multipath environments. The results show that the impact of multipath on carrier phase estimation can be largely mitigated, so that the carrier phase can be used for precise positioning. In addition, fixing the integer carrier phase cycle ambiguities can significantly reduce the time for the position solution to converge to high precision.","Multipath channels; multipath mitigation; OFDM; phase ambiguity; phase estimation; radio navigation; OA-Fund TU Delft","en","journal article","","","","","","","","","","Geoscience and Remote Sensing","Mathematical Geodesy and Positioning","","",""
"uuid:09455a90-5ad8-4677-965a-6316b91beb4a","http://resolver.tudelft.nl/uuid:09455a90-5ad8-4677-965a-6316b91beb4a","On the nature based flood defence dilemma and its resolution: A game theory based analysis","Janssen, S.K.H. (TU Delft Policy Analysis; Deltares); Vreugdenhil, H.S.I. (TU Delft Policy Analysis; Deltares); Hermans, L.M. (TU Delft Policy Analysis; IHE Delft Institute for Water Education); Slinger, J (TU Delft Policy Analysis; Rhodes University)","","2020","Nature-based flood defence is an innovative design alternative for achieving protection against flooding. Despite significant advancements in science, models and concepts, routine implementation beyond pilot projects remains limited. To better understand why, we have looked into the complexities of nature-based flood defence implementation and its resolutions, modelling decision-making situations using game theory in three nature-based flood defence cases: The Markermeer Dikes, the Afsluitdijk Dam and the Sand Engine. We observe that nature-based flood defence games are of a multi-level and nested nature. While the decision of whether to employ a nature-based flood defence is seemingly made at the project level, this can only happen when it is coherent with the institutional context that is determined at the policy level. A social dilemma is apparent: while a multi-functional nature-based solution is attractive to a coalition of actors, it is not the most beneficial option for individual actors. Hence, they are faced with the dilemma of opting for their maximum benefit or opting for the greater societal benefit which is less favorable to them. This social dilemma can be tackled by making ‘smart moves’, as inspired by the Sand Engine case. The nested nature of the problem requires structural change in the institutional context to enable favourable conditions for nature-based flood defence implementations.","Building with Nature; Implementation; Multi-level decision making; Sand Engine, Afsluitdijk, Markermeerdam; Social dilemma","en","journal article","","","","","","","","","","","Policy Analysis","","",""
"uuid:d4c05c2a-9664-4f15-949d-1303c7349453","http://resolver.tudelft.nl/uuid:d4c05c2a-9664-4f15-949d-1303c7349453","Mechanistic Modeling of Water-Alternating-Gas Injection and Foam-Assisted Chemical Flooding for Enhanced Oil Recovery","Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics); Torres Mendez, Fabian A. (Student TU Delft); Zitha, P.L.J. (TU Delft Reservoir Engineering)","","2020","History-matching of core-flood experimental data through numerical modeling is a powerful tool to get insight into the relevant physical parameters and mechanisms that control fluid flow in enhanced oil recovery processes. We conducted a mechanistic numerical simulation study aiming at modeling previously performed water-alternating-gas and foam-assisted chemical flooding core-flood experiments. For each experiment, a one-dimensional model was built. The obtained computed tomography scan data was used to assign varying porosity, and permeability, values to each grid block. The main goal of this study was to history-match measured phase saturation profiles along the core length, pressure drops, produced phase cuts, and the oil recovery history for each of the experiments conducted. The results show that, to obtain a good match for the water-alternating-gas experiment, gas relative permeability needs to be reduced as a function of injection time due to gas trapping. The surfactant phase behavior, for the aid of foam-assisted chemical flooding, was successfully simulated and its robustness was verified by effectively applying the same phase behavior model to the two different salinity conditions studied. It resulted in the oil mobilization, through the injection of a surfactant slug, being properly modeled. The mechanistic simulation of foam using the steady-state foam model built in UTCHEM proved inadequate for the mechanistic modeling of a foam drive in the presence of oil. An alternative heuristic approach was adopted to overcome this limitation.","","en","journal article","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:190bd32f-3dff-4004-b27d-4d848db620a0","http://resolver.tudelft.nl/uuid:190bd32f-3dff-4004-b27d-4d848db620a0","Effect of dimethyl disulfide on the sulfur formation and microbial community composition during the biological H2S removal from sour gas streams","Kiragosyan, Karine (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research); Picard, Magali (Wetsus, Centre for Sustainable Water Technology; Eurofins Agroscience Services Chem SAS 75); Sorokin, Dimitry Y. (TU Delft BT/Environmental Biotechnology; Wetsus, Centre for Sustainable Water Technology; Russian Academy of Sciences); Dijkstra, Jelmer (Wetsus, Centre for Sustainable Water Technology); Klok, Johannes B.M. (Wetsus, Centre for Sustainable Water Technology; Wageningen University & Research; Paqell B.V.); Roman, Pawel (Wetsus, Centre for Sustainable Water Technology); Janssen, Albert J.H. (Wageningen University & Research; Shell Global Solutions International B.V.)","","2020","Removal of organic and inorganic sulfur compounds from sour gases is required because of their toxicity and atmospheric pollution. The most common are hydrogen sulfide (H2S) and methanethiol (MT). Under oxygen-limiting conditions about 92 mol% of sulfide is oxidized to sulfur by haloalkaliphilic sulfur-oxidizing bacteria (SOB), whilst the remainder is oxidized either biologically to sulfate or chemically to thiosulfate. MT is spontaneously oxidized to dimethyl disulfide (DMDS), which was found to inhibit the oxidation of sulfide to sulfate. Hence, we assessed the effect of DMDS on product formation in a lab-scale biodesulfurization setup. DMDS was quantified using a newly, in-house developed analytical method. Subsequently, a chemical reaction mechanism was proposed for the formation of methanethiol and dimethyl trisulfide from the reaction between sulfide and DMDS. Addition of DMDS resulted in significant inhibition of sulfate formation, leading to 96 mol% of sulfur formation. In addition, a reduction in the dominating haloalkaliphilic SOB species, Thioalkalivibrio sulfidiphilus, was observed in favor of Thioalkaibacter halophilus as a more DMDS-tolerant with the 50 % inhibition coefficient at 2.37 mM DMDS.","Biodesulfurization; Biosulfur; Dimethyl disulfide; Selective inhibition; Sulfur-oxidizing bacteria","en","journal article","","","","","","","","","","","BT/Environmental Biotechnology","","",""
"uuid:83a1794c-52f8-420b-b588-eed019f78647","http://resolver.tudelft.nl/uuid:83a1794c-52f8-420b-b588-eed019f78647","The mental machine: Classifying mental workload state from unobtrusive heart rate-measures using machine learning","Hillege, Roderic H.L. (ProRail; Ordina); Lo, J.C. (TU Delft Organisation & Governance; ProRail); Janssen, Christian P. (Universiteit Utrecht); Romeijn, Nico (Universiteit Utrecht)","Sottilare, Robert A. (editor); Schwarz, Jessica (editor)","2020","This paper investigates whether mental workload can be classified in an operator setting using unobtrusive psychophysiological measures. Having reliable predictions of workload using unobtrusive sensors can be useful for adaptive instructional systems, as knowledge of a trainee’s workload can then be used to provide appropriate training level (not too hard, not too easy). Previous work has investigated automatic mental workload prediction using biophysical measures and machine learning, however less attention has been given to the level of physical obtrusiveness of the used measures. We therefore explore the use of color-, and infrared-spectrum cameras for remote photoplethysmography (rPPG) as physically unobtrusive measures. Sixteen expert train traffic operators participated in a railway human-in-the-loop simulator. We used two machine learning models (AdaBoost and Random Forests) to predict low-, medium- and high-mental workload levels based on heart rate features in a leave-one-out cross-validated design. Results show above chance classification for low- and high-mental workload states. Based on infrared-spectrum rPPG derived features, the AdaBoost machine learning model yielded the highest classification performance.","Adaptive Instructional Systems; Machine learning; Mental workload classification; Remote photoplethysmography","en","conference paper","SpringerOpen","","","","","","","","","","Organisation & Governance","","",""
"uuid:9a2c17e2-f554-415d-949e-111d86ae22f2","http://resolver.tudelft.nl/uuid:9a2c17e2-f554-415d-949e-111d86ae22f2","Governance Challenges of Inter-organizational Digital Public Services Provisioning: A Case Study on Digital Invoicing Services in Belgium","Wouters, Stijn (Katholieke Universiteit Leuven); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven)","Viale Pereira, Gabriela (editor); Janssen, Marijn (editor); Lee, Habin (editor); Lindgren, Ida (editor); Rodríguez Bolívar, Manuel Pedro (editor); Scholl, Hans Jochen (editor); Zuiderwijk, Anneke (editor)","2020","Governments aim to digitalize public services. Whereas initially they worked in isolation, nowadays they increasingly link different building blocks together to realize integrated public services. This evolution poses challenges concerning the governance of public services. The purpose of this paper is to identify governance challenges in inter-organizational digital public service delivery. To do this, we investigated a case study that deals with the creation of digital invoicing services in Belgium. The findings show seven groups of governance challenges that incorporate technical, organizational and inter-organizational factors. Governance challenges can be external, related to the environment and the users, as well as internal, related to the digitalization objectives and governance dynamics. Moreover, as public services evolve over time, so do governance challenges, suggesting that governance regimes may have to evolve accordingly to maintain coordinated service delivery.","E-government; Governance challenges; Inter-organizational collaboration; Public service delivery","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-03-24","","","Information and Communication Technology","","",""
"uuid:6d3b55b5-20f5-4626-a3ab-36a28a0fa7e1","http://resolver.tudelft.nl/uuid:6d3b55b5-20f5-4626-a3ab-36a28a0fa7e1","Behavioral factors influencing the opening of government data by civil servants: Initial findings from the literature","Kleiman, F. (TU Delft Information and Communication Technology); Meijer, Sebastiaan (KTH Royal Institute of Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Charalabidis, Yannis (editor); Cunha, Maria Alexandra (editor); Sarantis, Demetrios (editor)","2020","The actual opening of government data is done by civil servants operating within their institutional environment. As such, the institutional environment and their behavior towards the opening of data is key to increase the quality and quantity of open data. However, few studies have analyzed the behavior of government professionals towards open data policy. The objective of this paper is to review the existing literature to find the factors that influences civil servants behaviors towards open data. To identify the drivers and barriers, a literature review was performed listing the most cited papers with ""open government data""and ""barriers""focusing specific at the behavioral related factors. Even with the increasing of research on the topic of open data, still most of the papers focus on user drivers and barriers rather than on provider challenges. Even less studies focus on the civil servants' individual level of factors influencing their support to the release of governmental data. Most barriers found in the literature are related to infrastructural or technical issues. Whereas some individual level behavioral barriers could be found, including culture, lack of individual incentives and misunderstanding the impact of opening data, broader discussions on social norms, lack of education and experience are still missing in the literature. This paper contributes to the need for deeper understanding of the behavioral factors that influences the civil servants to support the opening of data.","Behavioral Barriers; Decision-Making; Open Data Policy","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:24114bd3-05a0-46df-8ca9-ab0c0a517ddc","http://resolver.tudelft.nl/uuid:24114bd3-05a0-46df-8ca9-ab0c0a517ddc","The burning number of directed graphs: Bounds and computational complexity","Janssen, R. (TU Delft Discrete Mathematics and Optimization)","","2020","The burning number of a graph was recently introduced by Bonato et al. Although they mention that the burning number generalises naturally to directed graphs, no further research on this has been done. Here, we introduce graph burning for directed graphs, and we study bounds for the corresponding burning number and the hardness of finding this number. We derive sharp bounds from simple algorithms and examples. The hardness question yields more surprising results: finding the burning number of a directed tree with one indegree-0 node is NP-hard, but FPT; however, it is W[2]complete for DAGs. Finally, we give a fixed-parameter algorithm to find the burning number of a digraph, with a parameter inspired by research in phylogenetic networks.","","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:96e3eba0-d890-46be-a8c2-85e90c1b8b7d","http://resolver.tudelft.nl/uuid:96e3eba0-d890-46be-a8c2-85e90c1b8b7d","Changing occupational structures and residential segregation in New York, London and Tokyo","van Ham, M. (TU Delft Urbanism; University of St Andrews); Uesugi, M. (Fukuoka Institute of Technology); Tammaru, T. (TU Delft Urban Studies; University of Tartu); Manley, D.J. (TU Delft Urban Studies; University of Bristol); Janssen, H.J. (TU Delft Urban Studies)","","2020","Based on data from the 1980s, Sassen’s influential book ‘The Global City’ interrogated how changes in the occupational structure affect socio-economic residential segregation in global cities. Here, using data for New York City, London and Tokyo, we reframe and answer this question for recent decades. Our analysis shows an increase in the share of high-income occupations, accompanied by a fall in low-income occupations in all three cities, providing strong evidence for a consistent trend of professionalization of the workforce. Segregation was highest in New York and lowest in Tokyo. In New York and London, individuals in high-income occupations are concentrating in the city centre, while low-income occupations are pushed to urban peripheries. Professionalization of the workforce is accompanied by reduced levels of segregation by income, and two ongoing megatrends in urban change: gentrification of inner-city neighbourhoods and suburbanization of poverty, with larger changes in the social geography than in levels of segregation.","","en","journal article","","","","","","Accepted Author Manuscript","","2021-02-17","","Urbanism","Urban Studies","","",""
"uuid:a1396661-4709-4139-9199-127fc62ee806","http://resolver.tudelft.nl/uuid:a1396661-4709-4139-9199-127fc62ee806","Barriers and Drivers of Digital Transformation in Public Organizations: Results from a Survey in the Netherlands","Tangi, Luca (Politecnico di Milano); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Benedetti, Michele (Politecnico di Milano); Noci, Giuliano (Politecnico di Milano)","Viale Pereira, Gabriela (editor); Janssen, Marijn (editor); Lee, Habin (editor); Lindgren, Ida (editor); Rodríguez Bolívar, Manuel Pedro (editor); Scholl, Hans Jochen (editor); Zuiderwijk, Anneke (editor)","2020","The introduction of ICT is requiring public administrations to transform their organizations to take advantage of these technologies. Despite its significance, no studies so far collected quantitative evidence on (i) how and the extent to which this transformation is currently underway and (ii) which drivers and barriers are hindering and leading this transformation process. This article aims at filling this gap by surveying Dutch public administrations. In total, 46 responses from different organizations were collected that provide insight into their transformation efforts. Findings show that digital transformation efforts had only a partial impact at the organizational level: processes, employees’ duties and tasks and information systems are going through a deep transformation, whereas the social system seems to be less affected by the transformation process. Moreover, the analysis results suggest that external drivers are the main motivation for organizational transformation, and that expected internal barriers do not de facto result in digital transformation. These counterintuitive results suggest that in public administrations only exogenous input result in a sense of urgency and that the perceived barriers to transformation can be overcome if there is sufficient external pressure.","Barriers and drivers; E-government; Organizational transformation; Socio-technical theory; Transformational government","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-02-24","","","Information and Communication Technology","","",""
"uuid:26f7027d-b021-4906-a18a-c48a0878a493","http://resolver.tudelft.nl/uuid:26f7027d-b021-4906-a18a-c48a0878a493","Generating Value from Government Data Using AI: An Exploratory Study","Gao, Y. (Huazhong University of Science and Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Viale Pereira, Gabriela (editor); Janssen, Marijn (editor); Lee, Habin (editor); Lindgren, Ida (editor); Rodríguez Bolívar, Manuel Pedro (editor); Scholl, Hans Jochen (editor); Zuiderwijk, Anneke (editor)","2020","Open government data initiatives have gained popularity around the world. Artificial Intelligence (AI) has the potential to make better use of data. Combining the OGD and AI is crucial to generate more value from data. In this paper we investigate what kind of value was generated through AI and how. A context-input-process-output/outcome (CIPO) framework is developed to describe and compare three cases. The overview of cases shows the huge potential of AI, but it also suggests that AI is hardly used by the public to create value from open data. The objectives of the three cases are efficiency, innovation and crime prevention, whereas common open government objectives like transparency, accountability and participation are given less attention. By using AI, the risks of data privacy and arriving at biased or wrong conclusions become more prominent. With the rise of data collection from Internet of Things, complying with the 5-stars of Berners-Lee becomes more important. We recommend policy makers to stimulate AI projects contributing to the open government goals and ensure that open data meets the 5-star requirements.","Artificial Intelligence; Internet of Things; Open data; Open government; Smart cities; Value creation","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-03-24","","","Information and Communication Technology","","",""
"uuid:e981615d-b449-45af-b343-05515ce643ea","http://resolver.tudelft.nl/uuid:e981615d-b449-45af-b343-05515ce643ea","Bayesian-belief Networks for Supporting Decision-making of the Opening Data by the Customs","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Rukanova, B.D. (TU Delft Information and Communication Technology); Molenhuis, Marcel (Customs Administration of the Netherlands); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Tan, Y. (TU Delft Information and Communication Technology)","Virkar, Shefali (editor); Janssen, Marijn (editor); Lindgren, Ida (editor); Melin, Ulf (editor); Mureddu, Francesco (editor); Parycek, Peter (editor); Tambouris, Efthimios (editor); Schwabe, Gerhard (editor); Scholl, Hans Jochen (editor)","2020","Open government data initiatives are part of the endeavor process of governments to show that they are accountable and transparent organizations. Opening more datasets to external data analytics providers or other government organizations holds the potential to help governments to improve their processes by promoting a better understanding and enhancing the decision-making. Nevertheless, the decision-making to disclose datasets is challenging. Decision-makers often refuse to open their datasets due to several potential risks. In situations like the Dutch Customs, a dataset can contain competitive sensitive data, and multiple parties have to agree to open it. Given this complex situation, in this paper, we test a Bayesian-belief Network method for supporting the decision to open data. Our work contributes to Customs in their efforts to disclose more datasets and helping decision-makers in the process of evaluating data and defining strategies of how to move from closed to open decisions.","Bayesian-belief Networks; Customs; Decision-making; Open Data; Risks","en","conference paper","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:f2a7ebe7-6177-4a18-ade8-af8db1c34e3a","http://resolver.tudelft.nl/uuid:f2a7ebe7-6177-4a18-ade8-af8db1c34e3a","Linear Time Algorithm for Tree-Child Network Containment","Janssen, R. (TU Delft Discrete Mathematics and Optimization); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization)","Martín-Vide, Carlos (editor); Vega-Rodríguez, Miguel A. (editor); Wheeler, Travis (editor)","2020","Phylogenetic networks are used to represent evolutionary scenarios in biology and linguistics. To find the most probable scenario, it may be necessary to compare candidate networks, to distinguish different networks, and to see when one network is embedded in another. Here, we consider the Network Containment problem, which asks whether a given network is contained in another network. We give a linear-time algorithm to this problem for the class of tree-child networks using the recently introduced tree-child sequences by Linz and Semple. We implement this algorithm in Python and show that the linear-time theoretical bound on the input size is achievable in practice.","Network Containment; Phylogenetics; Tree-child networks; Tree-child sequences","en","conference paper","Springer","","","","","Accepted author manuscript","","2021-04-03","","","Discrete Mathematics and Optimization","","",""
"uuid:6b7cd613-94d1-4549-b25c-a8d7c84136f0","http://resolver.tudelft.nl/uuid:6b7cd613-94d1-4549-b25c-a8d7c84136f0","Roles and capabilities of enterprise architecture in big data analytics technology adoption and implementation","Gong, Y. (TU Delft Information and Communication Technology; Wuhan University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Organizations are attempting to harness the power of big data analytics. Enterprise architecture can be used as an instrument to integrate big data analytics into the existing IT landscape and enabling the development of capabilities to create value from these technologies. Yet, there is limited research about the role of enterprise architecture in adopting big data analytics. This paper explores enterprise architecture roles and capabilities for the adoption of big data analytics by conducting a qualitative case study at the Dutch Tax and Customs Administration. The first attempt to adopt big data analytics was focused on integrating analytics into the current complex IT landscape, but this encountered many challenges and resulted in slow progress. To overcome these challenges, a separate department was created to quickly harness the potential of big data analytics. Enterprise architecture was used for impact analysis and to create a transition process. The findings suggest that enterprise architecture was used in different ways at the various stages of adoption and implementation, requiring different roles and a different set of capabilities. Enterprise architecture was found to be contingent on the type of technology and the situation at hand. We recommend more research into the role of the context in enterprise architecture research.","Adoption; Big data; Big data analytics; Dynamic capabilities; E-government; Enterprise architecture; Flexibility","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:ea01f52a-f08f-41a2-9bb0-f07689f5b25b","http://resolver.tudelft.nl/uuid:ea01f52a-f08f-41a2-9bb0-f07689f5b25b","Data Governance as Success Factor for Data Science","Brous, P.A. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Krans, Rutger (Rijkswaterstaat)","Hattingh, Marié (editor); Matthee, Machdel (editor); Smuts, Hanlie (editor); Pappas, Ilias (editor); Dwivedi, Yogesh K. (editor); Mäntymäki, Matti (editor)","2020","More and more, asset management organizations are introducing data science initiatives to support predictive maintenance and anomaly detection. Asset management organizations are by nature data intensive to manage their assets like bridges, dykes, railways and roads. For this, they often implement data lakes using a variety of architectures and technologies to store big data and facilitate data science initiatives. However, the decision-outcomes of data science models are often highly reliant on the quality of the data. The data in the data lake therefore has to be of sufficient quality to develop trust by decision-makers. Not surprisingly, organizations are increasingly adopting data governance as a means to ensure that the quality of data entering the data lake is and remains of sufficient quality, and to ensure the organization remains legally compliant. The objective of the case study is to understand the role of data governance as success factor for data science. For this, a case study regarding the governance of data in a data lake in the asset management domain is analyzed to test three propositions contributing to the success of using data science. The results show that unambiguous ownership of the data, monitoring the quality of the data entering the data lake, and a controlled overview of standard and specific compliance requirements are important factors for maintaining data quality and compliance and building trust in data science products.","Asset management; Big data; Data governance; Data lake; Data quality; Data science; Digital transformation","en","conference paper","SpringerOpen","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-10-01","","","Information and Communication Technology","","",""
"uuid:5ec1b711-be8f-4a57-93c7-e2a570ba038e","http://resolver.tudelft.nl/uuid:5ec1b711-be8f-4a57-93c7-e2a570ba038e","Digicampus - Preliminary lessons from a quadruple helix ecosystem for public service innovation","Bharosa, Nitesh (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Many governments want to harness the potential of new digital technologies for shaping an progressive and inclusive society. However, they often struggle to translate their ambitions into reality. Drawing on the quadruple helix model, Digicampus is an innovation ecosystem in the Netherlands in which government, academia, citizens and companies explore future public services. Since the launch of Digicampus, more than hundred requests for collaboration were submitted by public organizations. The objective of this ongoing research paper is to share the experiences of starting a quadruple helix ecosystem for public service innovation. We do this by discussing the innovation guidelines, research agenda and lessons learned in the first year of Digicampus. Important innovation guidelines are: embrace design thinking and an agile way of working, facilitate multidisciplinary knowledge exchange, co-create prototypes (make technologies tangible) and foster open experimentation (assess the potential). Other countries looking to explore future public services in a collaborative manner can benefit from the insights presented in this paper.","Co-creation; Digital government; Public sector innovation; Quadruple helix","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9245c5d8-2646-4bf4-8db8-e94e38d54c07","http://resolver.tudelft.nl/uuid:9245c5d8-2646-4bf4-8db8-e94e38d54c07","Trusted decision-making: Data governance for creating trust in data science decision outcomes","Brous, Paul (Legend Data Management); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2020","Organizations are increasingly introducing data science initiatives to support decision-making. However, the decision outcomes of data science initiatives are not always used or adopted by decision-makers, often due to uncertainty about the quality of data input. It is, therefore, not surprising that organizations are increasingly turning to data governance as a means to improve the acceptance of data science decision outcomes. In this paper, propositions will be developed to understand the role of data governance in creating trust in data science decision outcomes. Two explanatory case studies in the asset management domain are analyzed to derive boundary conditions. The first case study is a data science project designed to improve the efficiency of road management through predictive maintenance, and the second case study is a data science project designed to detect fraudulent usage of electricity in medium and low voltage electrical grids without infringing privacy regulations. The duality of technology is used as our theoretical lens to understand the interactions between the organization, decision-makers, and technology. The results show that data science decision outcomes are more likely to be accepted if the organization has an established data governance capability. Data governance is also needed to ensure that organizational conditions of data science are met, and that incurred organizational changes are managed efficiently. These results imply that a mature data governance capability is required before sufficient trust can be placed in data science decision outcomes for decision-making.","Asset management; Big data; Boundary condition; Data governance; Data lake; Data quality; Data science; Digital transformation","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:f98bca0e-5ee8-4fd3-8a60-d0e624e525d6","http://resolver.tudelft.nl/uuid:f98bca0e-5ee8-4fd3-8a60-d0e624e525d6","Investigation on foam-assisted chemical flooding for enhanced oil recovery: An experimental and mechanistic simulation study","Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics)","Zitha, P.L.J. (promotor); Delft University of Technology (degree granting institution)","2020","Foam-assisted chemical flooding (FACF) is a novel enhanced oil recovery (EOR) methodology that combines the injection of a surfactant slug, to mobilize previously trapped residual oil, with foam generation for drive mobility control, thus displacing the mobilized banked oil. The main goal of this study concerns the understanding of oil mobilization and displacement mechanisms that take place in a FACF process. At first, in order to promote understanding of the incremental benefits FACF can provide one with, we get ourselves familiar with immiscible gas flooding and water-alternating-gas (WAG) injection. Subsequently, we study the effect of aqueous phase salinity, drive foam quality, and method of drive foam injection, on the oil mobilization and displacement processes in FACF, at both model-like conditions and in a reservoir setting. We present novel insights, on the dynamic physical processes that take place within the porous media during FACF, which could only be obtained through the assistance of a medical CT scanner. Moreover, in order to identify the main controlling parameters that determine incremental oil recovery in WAG and FACF, we develop several mechanistic models for the aid of history-matching laboratory observations.","alkaline; surfactant; foam; oil; immiscible gas injection; water-alternating-gas; enhanced oil recovery; core-flood; computed tomography; mechanistic simulation","en","doctoral thesis","","978-94-6384-099-6","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:adeaefb0-0da6-4ef6-be12-430fd2a23355","http://resolver.tudelft.nl/uuid:adeaefb0-0da6-4ef6-be12-430fd2a23355","Sociale duurzaamheid: meer dan een checklist","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2020","Sociale duurzaamheid is niet puur kwantitatief te meten. Het beoordelen of een gebiedsontwikkeling in sociaal opzicht is geslaagd, hangt af van je normatieve positie en de waarden die je centraal stelt. De vraag is vervolgens hoe die hebben bijgedragen aan het welzijn van de inwoners van het gebied.","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:f9bbff72-b9b4-4694-a188-b2f1451449af","http://resolver.tudelft.nl/uuid:f9bbff72-b9b4-4694-a188-b2f1451449af","Capturing Agents in Security Models: Agent-based Security Risk Management using Causal Discovery","Janssen, S.A.M. (TU Delft Air Transport & Operations)","Langendoen, K.G. (promotor); Curran, R. (promotor); Sharpanskykh, Alexei (copromotor); Delft University of Technology (degree granting institution)","2020","Airports are important transportation hubs that reside in the heart of modern civilizations.They are of major economic and symbolic value for countries but are thereforealso attractive targets for adversaries. Over the years we have observed successful andunsuccessful terrorist attacks at airports, of which the recent Brussels Airport attack andIstanbul Atatürk Airport attack are two examples.A widely-used method to defend airports against these types of events is that of securityrisk management. Following this approach, security risks are quantified based onthreats, vulnerabilities, and consequences. These risks are then used as a basis to implementsecurity measures that can reduce the risks to acceptable levels. Several securityrisk management approaches were proposed before, such as attack trees and securitygames, but they struggle to include diverse human factors in their analysis. These factorsare inherently present in modern airports, as passengers, employees, and visitors areall humans. Furthermore, existing methods struggle to take other performance metrics,such as efficiency, into account.This thesis addresses these limitations by proposing a novel security risk managementapproach that relies on agent-based models and Monte Carlo simulations. Thisapproach builds on the existing security risk management framework but exploits theadvantages of the agent-based modelling paradigm. Agent-based models allow for theinclusion of rich cognitive, social and organizational models that enable the modellingof human behaviour. Furthermore, agent-based modelling is a suitable paradigm to estimatea variety of performance indicators, including airport efficiency.Two case studieswere performed to assess the performance of our agent-based securityrisk management approach. In these case studies we apply our approach to managesecurity risks at a regional airport, as well as an international airport.","Security Risk Management; Agent-based Modelling; Causal Discovery; Airport Terminal","en","doctoral thesis","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:e75fdec1-3bc8-44aa-93c8-e521e1a8d049","http://resolver.tudelft.nl/uuid:e75fdec1-3bc8-44aa-93c8-e521e1a8d049","Data-driven analysis of airport security checkpoint operations","Janssen, S.A.M. (TU Delft Air Transport & Operations); van der Sommen, Régis (Student TU Delft); Dilweg, Alexander (Rotterdam The Hague Airport); Sharpanskykh, Alexei (TU Delft Air Transport & Operations)","","2020","Airport security checkpoints are the most important bottleneck in airport operations, but few studies aim to empirically understand them better. In this work we address this lack of data-driven quantitative analysis and insights about the security checkpoint process. To this end, we followed a total of 2277 passengers through the security checkpoint process at Rotterdam The Hague Airport (RTM), and published detailed timing data about their journey through the process. This dataset is unique in scientific literature, and can aid future researchers in the modelling and analysis of the security checkpoint. Our analysis showed important differences between six identified passenger types. Business passengers were found to be the fastest group, while passengers with reduced mobility (PRM) and families were the slowest two groups. We also identified events that hindered the performance of the security checkpoint, in which groups of passengers had to wait long for security employees or other passengers. A total of 335 such events occurred, with an average of 2.3 passengers affected per event. It was found that a passenger that had a high luggage drop time was followed by an event in 27% of the cases, which was the most frequent cause. To mitigate this waiting time of subsequent passengers in the security checkpoint process, we performed an experiment with a so-called service lane. This lane was used to process passengers that are expected to be slow, while the remaining lanes processed the other passengers. It was found that the mean throughput of the service lane setups was higher than the average throughput of the standard lanes, making it a promising setup to investigate further.","Airport efficiency; Airport security; Data analysis","en","journal article","","","","","","","","","","","Air Transport & Operations","","",""
"uuid:08a7cc6c-ded7-4a9f-a4a7-be64d7e261ef","http://resolver.tudelft.nl/uuid:08a7cc6c-ded7-4a9f-a4a7-be64d7e261ef","Zo meet je de waarde van sociale investeringen","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2020","Wat leveren investeringen in de zachte, sociale kant van gebiedsontwikkeling op? Deze vraag houdt ontwikkelaars, gemeenten en beleggers al langer bezig. Een antwoord is te vinden via de capability-benadering. Hierbij staan niet de kwantitatieve fysieke functies centraal, maar de kwalitatieve mate waarin mensen in staat zijn deze te gebruiken.","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:b6bc3985-e314-46c4-8933-f5f18e7b6957","http://resolver.tudelft.nl/uuid:b6bc3985-e314-46c4-8933-f5f18e7b6957","Private partijen op zoek naar maatschappelijke impact","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2020","De coronapandemie heeft het belang van maatschappelijke waarden in gebiedsontwikkeling alleen maar zichtbaarder gemaakt. Tijdens een door het Urban Land Institute georganiseerd webinar onderschrijven beleggers en ontwikkelaars dat ook. De vraag is wel hoe die investeringen te meten en daarmee te verantwoorden.","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:29904ce0-f53e-470d-a926-6821a00b2e67","http://resolver.tudelft.nl/uuid:29904ce0-f53e-470d-a926-6821a00b2e67","Rozendaal in Leusden: zelfbeheer bewoners onlosmakelijk onderdeel van de wijk","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2020","In de GO Zomertour vertellen experts en liefhebbers over hun favoriete gebiedsontwikkeling. In het tiende en laatste deel bezoekt Céline Janssen de wijk Rozendaal. Deze wijk in Leusden was 50 jaar geleden een vooruitstrevende wijk waar zelfbeheer van bewoners een onlosmakelijk onderdeel van was. En wat blijkt? Het werkt nog steeds. “Als dit zo’n succes is, waarom is dit concept niet op veel meer plekken in Nederland gerealiseerd?”","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:0c9f992c-7390-4d8f-aa6d-d89f0e7866a0","http://resolver.tudelft.nl/uuid:0c9f992c-7390-4d8f-aa6d-d89f0e7866a0","Electronic Properties of (Pseudo-) Two-Dimensional Materials","Janssen, V.A.E.C. (TU Delft QN/van der Zant Lab)","van der Zant, H.S.J. (promotor); van der Molen, S.J. (promotor); Delft University of Technology (degree granting institution)","2020","This thesis describes research into the interaction between electrons and various (pseudo) two-dimensional materials. This research is using two approaches: in Chapters 3 and 4 a low-energy electron microscope is used, and in Chapters 5 and 6 transport properties are studied. Chapter 1 introduces the concept of a two-dimensional material. First, the various kinds of such materials are illustrated. Secondly, the specific materials used in this thesis will be treated. We will see that two-dimensionality can be achieved in different ways: first of all top-down in a method where layers are peeled off a crystal until a single atomic layer remains. Secondly: bottom-up, in a method where a single layer is created from smaller components. Chapter 2 introduces the setup which was used for the measurements in Chapters 3 and 4. In these chapters, we will look at materials using electrons, in a low-energy electron microscope (LEEM). A regular microscope works by illuminating a sample with light. In a microscope, we observe bright and dark patches (corresponding to reflection and absorption of the light, respectively), as well as colors (corresponding to reflection and absorption of different wavelengths or energies of the light). We can also magnify objects using lenses. The LEEM works in a very comparable way, with the major difference that we do not use light (i.e. photons) but electrons to image the sample. An image is formed by electrons after interaction with the sample has taken place. This image can also be magnified, and contains bright and dark patches, from which the interaction of the material with the electrons can be established. Besides this, it is possible to change the electron energy in the setup, which makes it possible to measure the interaction at different energies. In the third Chapter we use the LEEM’s ability to measure the atomic orientation of thin layers of crystal. We look at graphene, a two-dimensional lattice of carbon atoms. This graphene was grown on a wafer. Contrary to peeling a crystal to atomically thin layers, this growth method is compatible with industrial processes, which require large slabs of graphene in predictable shapes. In developing these growing methods, it turns out to be difficult to grow large pieces of single-crystal material. With LEEM we look at differences in angular orientation in a layer of graphene. The motivation for this is that boundaries between such domains have a negative influence on the conductive properties of the material. In the fourth Chapter a method is extended to measure and visualize band structures in two-dimensional materials. We look specifically at molybdenum disulfide (MoS2) and hexagonal boron nitride (hBN). The method (scanning ARRES) rapidly scans the electron bream across the first Brillouin zone. This gives a complete image of the band structure of these materials at energies above the Fermi level plus work function. The fifth and sixth Chapters concern single layer superstructures built out of nanocrystals. The building blocks are lead selenide (PbSe) single crystals in the form of a truncated cube, with a diameter of about 5 nm. By allowing these crystals to organize on a fluid surface, a single layer of crystals emerges. These crystals bond covalently in the direction of the atomic lattice. The material which emerges from this process can have multiple shapes, in this thesis we study the square structure. In Chapter 5 we study the conductance properties of such a structure at room temperature, under the influence of an ionic-fluid gate. This gate makes is possible to achieve high charge densities in these structures. We measure high mobilities for these systems, in the order of 1 cm2/Vs. In the sixth Chapter these samples are cooled to approximately 4 K. Despite the high mobilities measured in Chapter 5, the dependence of the conductance with temperature shows that transport is dominated by a hopping process and not by band transport, at the length scale of these samples.","2D materials; low energy electron microscopy (LEEM); angleresolved reflected-electron spectroscopy (ARRES); nano-crystal supper lattices; transport; ionic-liquid gate","en","doctoral thesis","","978-90-8593-448-6","","","","","","","","","QN/van der Zant Lab","","",""
"uuid:1d092be9-24c6-4230-8ad5-469a1fcf3a51","http://resolver.tudelft.nl/uuid:1d092be9-24c6-4230-8ad5-469a1fcf3a51","How the other half lives: coronavirus, housing and justice","Janssen, C. (TU Delft Practice Chair Urban Area Development); Jonkman, Arend (TU Delft Housing Institutions & Governance); Kimhur, Boram (TU Delft Housing Institutions & Governance); Kramer, J. (TU Delft Practice Chair Urban Area Development)","","2020","Covid-19 and especially the extreme measures of the lockdown in response to the virus, have exposed existing housing inequalities. They revealed how, in the 21st century, households still live in poor and insecure housing conditions exposing them to increased physical and mental health risks. In the Netherlands, where we as authors are based, similar inequalities and injustices in the housing sector can be observed. How can the wide variety of impacts of the coronavirus be understood, and what should be done to address them? Justice theories offer a valuable framework. By spotlighting the impacts of the coronavirus crisis on four households who are differently affected, we explore different critical perspectives to analyse the current crisis more coherently.","coronavirus; justice; housing inequalities; values","en","report","1M Homes initiative","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:90a44604-3eb8-470d-837e-6d0d924e8315","http://resolver.tudelft.nl/uuid:90a44604-3eb8-470d-837e-6d0d924e8315","Implementing social sustainability in area development projects in the Netherlands","Janssen, C. (TU Delft Practice Chair Urban Area Development; TU Delft Urban Development Management); Daamen, T.A. (TU Delft Urban Development Management); Verdaas, J.C. (TU Delft Practice Chair Urban Area Development)","","2020","During recent decades, urbanization processes and changing population compositions in European cities have underlined the relevance of social sustainability for urban development. Despite a growing amount of research on the social sphere of sustainability, the actual implementation of social sustainability in area development projects remains problematic. In the Netherlands, as in most other European countries, area development is understood as an interdisciplinary practice that strives to integrate strategies, activities and interests of public and private actors into perceived sustainable projects. If area development projects are considered as acts of policy implementation, two questions rise: 1) How are social sustainability dimensions planned, operationalized and implemented through area development projects? and 2) How are they related to governance configurations and mechanisms that relate to decision-making and interventions in these area development projects? The main aim of this paper is to construct a theoretically informed analytical approach to be further developed and applied in PhD research about the implementation of perceived “social sustainability” in area development projects in the Netherlands. We conclude that the implementation of social sustainability in area development projects is a governance process that requires political interventions in a market-driven society and hypothesize that the outcomes of social sustainability in area development are dependent on various aspects of this governance process.","area development; social sustainability; equity; urban governance; governance performance; implementation","en","journal article","","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:c17e2052-8b27-4c29-b152-d6d651f43255","http://resolver.tudelft.nl/uuid:c17e2052-8b27-4c29-b152-d6d651f43255","Comparing the topology of phylogenetic network generators","Janssen, R. (TU Delft Discrete Mathematics and Optimization; TU Delft Delft Institute of Applied Mathematics); Liu, Pengyu (Simon Fraser University)","","2021","Phylogenetic networks represent evolutionary history of species and can record natural reticulate evolutionary processes such as horizontal gene transfer and gene recombination. This makes phylogenetic networks a more comprehensive representation of evolutionary history compared to phylogenetic trees. Stochastic processes for generating random trees or networks are important tools in evolutionary analysis, especially in phylogeny reconstruction where they can be utilized for validation or serve as priors for Bayesian methods. However, as more network generators are developed, there is a lack of discussion or comparison for different generators. To bridge this gap, we compare a set of phylogenetic network generators by profiling topological summary statistics of the generated networks over the number of reticulations and comparing the topological profiles.","network generator; network topology; Phylogenetic network","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:46d143ef-c86b-4a77-9f96-a8b7ac727eec","http://resolver.tudelft.nl/uuid:46d143ef-c86b-4a77-9f96-a8b7ac727eec","Human Control and Discretion in AI-driven Decision-making in Government","Mitrou, Lilian (University of the Aegean); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Loukis, Euripidis (University of the Aegean)","Loukis, Euripidis (editor)","2021","Traditionally public decision-makers have been given discretion in many of the decisions they have to make in how to comply with legislation and policies. In this way, the context and specific circumstances can be taken into account when making decisions. This enables more acceptable solutions, but at the same time, discretion might result in treating individuals differently. With the advance of AI-based decisions, the role of the decision-makers is changing. The automation might result in fully automated decisions, humans-in-the-loop or AI might only be used as recommender systems in which humans have the discretion to deviate from the suggested decision. The predictability of and the accountability of the decisions might vary in these circumstances, although humans always remain accountable. Hence, there is a need for human-control and the decision-makers should be given sufficient authority to control the system and deal with undesired outcomes. In this direction this paper analyzes the degree of discretion and human control needed in AI-driven decision-making in government. Our analysis is based on the legal requirements set/posed to the administration, by the extensive legal frameworks that have been created for its operation, concerning the rule of law, the fairness-non-discrimination, the justifiability and accountability, and the certainty/predictability.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-07-12","","","Information and Communication Technology","","",""
"uuid:ae0279b3-e6f4-44e3-9b58-74a5464bbf5a","http://resolver.tudelft.nl/uuid:ae0279b3-e6f4-44e3-9b58-74a5464bbf5a","Engaging citizens in digital public service innovation ecosystems-insights from the Netherlands and Italy","Bharosa, Nitesh (TU Delft Information and Communication Technology); Marangio, Federica (University of Salento); Petti, Claudio (University of Salento); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Loukis, Euripidis (editor)","2021","Public agencies struggle with engaging citizens in digital public service innovation. The notion that citizen engagement in public service innovation can lead to more citizen-friendly digital services is widely accepted. Moreover, citizen engagement has also become an indicator of legitimacy; public service innovation without citizen engagement is more likely to be scrutinized on public values like privacy, transparency, fairness, and citizen control. Yet it remains difficult to engage with citizens throughout the various stages of innovation. Often, the hard question of how to balance system performance and public values in innovation resurfaces, and we cannot leave it to software programmers to answer this question. This short paper reveals how the Netherlands and Italy are engaging citizens in public service innovation. We found that in both countries, the quadruple helix approach is gaining support and citizen engagement is increasingly becoming the norm rather than the exception. Both countries are gaining experience with new citizen engagement methods like user-driven prototyping and living labs. We found that these methods increase empathy, creativity and reflection on ethical dilemmas. Following such methods also signals to policymakers that a democratic process was followed, ultimately backing a specific innovation direction. Other countries looking to enhance citizen engagement in public services innovation can benefit from the insights presented in this paper.","digital public service innovation; innovation ecosystems; quadruple helix; user driven prototyping","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:97e154fa-3d4e-4478-94e7-599bcedfb7e7","http://resolver.tudelft.nl/uuid:97e154fa-3d4e-4478-94e7-599bcedfb7e7","Designing a User Interface for Improving the Usability of a Statistical Disclosure Control Tool","Rawat, Anshika (Student TU Delft); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Bargh, Mortaza S. (Wetenschappelijk Onderzoek- en Documentatiecentrum, ministerie van Justitie en veiligheid; Rotterdam University of Applied Sciences); Choenni, Sunil (Wetenschappelijk Onderzoek- en Documentatiecentrum, ministerie van Justitie en veiligheid; Rotterdam University of Applied Sciences)","","2021","Data sets often contain personal data that are not needed for analysis. Statistical Disclosure Control (SDC) is a personal data minimizing technology to reduce personal data in a data set while maintaining the utility of the data set at an acceptable level. SDC tools usage lags due to the complexity encountered by users. The aim of the research in this paper is to reduce the complexity of SDC tools via improving their ease of use. For this study information system adoption literature is reviewed, some usability challenges are identified, and a User Interface (UI) prototype is developed. From the literature, some design principles are derived related to minimal memory, feature self-descriptiveness, user guidance, navigability, minimal action, and UI familiarity. Based on these principles, a prototype is developed and evaluated. The findings suggest that the designed UI overcomes the identified UI-related issues of an SDC tool called ARX but show no significance in reducing the complexity associated with the SDC-related complexity. The findings suggest that while reducing the complexity of the UI might be a good approach to address the problem of adopting SDC technology within organizations, there is a need for complementary approaches to increase the usability and adoption of an SDC tool.","Design principles; Personal data minimization; Statistical disclosure control; Technology adoption; User interface","en","conference paper","Institute of Electrical and Electronics Engineers (IEEE)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-05-22","","","Information and Communication Technology","","",""
"uuid:fdb38193-f5f1-43d1-a9a0-1bb49ae58599","http://resolver.tudelft.nl/uuid:fdb38193-f5f1-43d1-a9a0-1bb49ae58599","Data science as knowledge creation a framework for synergies between data analysts and domain professionals","van der Voort, H.G. (TU Delft Organisation & Governance); van Bulderen, Sabine (IVO Rechtspraak); Cunningham, Scott (University of Strathclyde); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2021","The road from data generation to data use is commonly approached as a data-driven, functional process in which domain expertise is integrated as an afterthought. In this contribution we complement this functional view with an institutional view, that takes data analysis and domain professionalism as complementary (yet fallible) knowledge sources. We developed a framework that identifies and amplifies synergies between data analysts and domain professionals instead of taking one of them (i.e. data analytics) at the centre of the analytical process. The framework combines the often-cited CRISP-DM framework with a knowledge creation framework. The resulting framework is used in a data science project at a Dutch inspectorate that seeks to use data for risk-based inspection. The findings show first support of our framework. They also show that whereas more complex models have a higher predictive power, simpler models are sometimes preferred as they have the potential to create more synergies between inspectors and data analyst. Another issue driven by the integrated framework is about who of the involved actors should own the predictive model: data analysts or inspectors.","Data science; Knowledge; Predictive model; Professionalism; Risk-based inspection; Value creation","en","journal article","","","","","","","","","","","Organisation & Governance","","",""
"uuid:e81c2f75-d870-4fac-a590-fa848ec7cfd0","http://resolver.tudelft.nl/uuid:e81c2f75-d870-4fac-a590-fa848ec7cfd0","Design of Sparse Multiband Signal for Precise Positioning with Joint Low-Complexity Time Delay and Carrier Phase Estimation","Dun, H. (TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems)","","2021","This paper presents a methodology to design a sparse multiband ranging signal with a large virtual bandwidth, from which time delay and carrier phase are estimated by a low complexity multivariate maximum likelihood (ML) method. In the estimation model for a multipath channel, not all reflected paths are considered, and time delay and carrier phase are estimated in a step-wise manner to further reduce the computational load. By introducing a measure of dependence and a measure of bias for a multipath reflection, we analyse the bias, precision and accuracy of time delay and carrier phase estimation. Since these two indicators are determined by the signal spectrum pattern, they are used to formulate an optimization for signal design. By solving the optimization problem, only a few bands from the available signal spectrum are selected for ranging. Consequently, the designed signal only occupies a small amount of signal spectrum but has a large virtual bandwidth and can thereby still offer a high ranging precision with only a small bias, based on the low-complexity simplified ML method. Numerical and laboratory experiments are carried out to evaluate the ranging performance of the proposed estimation method based on sparsely selected signal bands. Relative positioning, in which we only measure a change in position, based on either the time delay estimates or the carrier phase estimates, is presented as a proof-of-concept for precise positioning. The results show that positioning based on only 7 out of 16 signal bands, sparsely placed in the available spectrum, achieves a decimeter level accuracy when using time delay estimates, and a millimeter level accuracy when using carrier phase estimates. Compared with the case of using all available bands, and without largely decreasing the positioning performance, the computational complexity when using the sparse multiband signal can be reduced by about 80%.","Carrier phase estimation; multiband signal; multipath channel; optimization; precise positioning; sparsity; time delay estimation","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:a332cb52-8cb8-4080-ad7b-1d858e5d4243","http://resolver.tudelft.nl/uuid:a332cb52-8cb8-4080-ad7b-1d858e5d4243","The resurgence of business process re-engineering in public sector transformation efforts: exploring the systemic challenges and unintended consequences","Weerakkody, Vishanth (Bradford University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); El-Haddadeh, Ramzi (Qatar University)","","2021","The realisation of citizen-centric services in the public sector requires breaking traditional silos and transforming existing institutional structures and processes. Recent transformation efforts undertaken in government institutions have embraced business process re-engineering (BPR) concepts championed by the private sector over decades ago to facilitate such change. While public opinion continues to differ about these transformation efforts' success, there is little evidence to explain the influence of BPR on their success or failure. This paper explores BPR led public sector transformation efforts in two local authorities in Europe to evaluate the outcomes realised for both government and citizens. Empirical evidence reveals that while transformation efforts contributed towards improving efficiency and integrating processes across functions in the public sector, the institutional structures evolved into a collection of reshaped and newly formed siloes, which were distinctly focused on delivering a citizen-centric service.","BPR; Business process re-engineering; Citizen centric; Public sector; Silos; Transformation","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9c08656e-ad69-4f8b-8145-6575bebb85dc","http://resolver.tudelft.nl/uuid:9c08656e-ad69-4f8b-8145-6575bebb85dc","A USRP based testbed for wideband ranging and positioning signal acquisition","Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems); Dun, H. (TU Delft Mathematical Geodesy and Positioning); Kazaz, T. (TU Delft Signal Processing Systems); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning)","","2021","For validation and demonstration of high accuracy ranging and positioning algorithms and systems, a wideband radio signal generation and acquisition testbed, tightly synchronized in time and frequency, is needed. The development of such a testbed requires solutions to several challenges. Tight time and frequency synchronization, derived from a centrally distributed time-frequency reference signal, needs to be maintained in the hardware of the transmitter and receiver nodes, and wideband signal acquisition requires sustainable data throughput between the receiver and host PC as well as data storage at GB level. This article presents a testbed for wideband radio signal acquisition, for validation and demonstration of high accuracy ranging and positioning. It consists of multiple Ettus X310 universal software radio peripherals (USRPs) and supports high accuracy (<100 ps) time-deterministic, sustainable signal transmission and acquisition, with a bandwidth up to 320 MHz (in dual channel mode) and frequencies up to 6 GHz. Generation and processing of wideband arbitrary signal waveforms is done offline. To realize these features, radio frequency on chip (RFNoC) compatible HDL units were developed for integration in the X310 SDR platform. Wideband transmission and signal acquisition at a lower duty cycle is applied to reduce the data offloading throughput to the host's personal computer (PC). Benchmarking of the platform was performed to demonstrate sustainable long duration dual channel acquisition. Indoor range measurements with the synchronous operation of the testbed show a decimeter-level accuracy.","Burst transmission; Ettus X310; data acquisition; ranging and positioning; universal software radio peripheral (USRP); wideband radio testbed","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:c84b3541-d8c0-43c1-b021-58984ee83ccf","http://resolver.tudelft.nl/uuid:c84b3541-d8c0-43c1-b021-58984ee83ccf","Heading in the right direction? Using head moves to traverse phylogenetic network space","Janssen, R. (TU Delft Discrete Mathematics and Optimization)","","2021","Head moves are a type of rearrangement moves for phylogenetic net-works. They have primarily been studied as part of other types of moves, such as rSPR moves. Here, we study head moves as a type of moves on themselves. We show that the tiers (k > 0) of phylogenetic network space are connected by local head moves. Then, we show tail moves and head moves are closely related: sequences of tail moves can be converted into sequences of head moves and vice versa, changing the length by at most a constant factor. Because the tiers of network space are connected by rSPR moves, this gives a second proof of the connectivity of these tiers. Furthermore, we show that these tiers have small diameter by reproving the connectivity a third time. As the head move neighbourhood is small in general, this makes head moves a good candidate for local search heuristics. Finally, we prove that finding the shortest sequence of head moves between two networks is NP-hard.","Phylogenetics; Rearrangement; Graph theory; NP-completeness; Connectedness; Phylogenetic networks","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:f4a57b84-255e-443b-9994-f37c7c179d4f","http://resolver.tudelft.nl/uuid:f4a57b84-255e-443b-9994-f37c7c179d4f","It Is Me, Chatbot: Working to Address the COVID-19 Outbreak-Related Mental Health Issues in China. User Experience, Satisfaction, and Influencing Factors","Zhu, Yonghan (Chongqing University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Wang, Rui (Chongqing University); Liu, Yang (Chongqing University)","","2021","The global spread of COVID-19 has caused a huge number of confirmed cases and deaths, which in return leads to a plethora of mental disorders across the world. In order to address citizens’ psychological problems, government agencies in many countries have employed AI-based chatbots to provide mental health services. However, there is a limited understanding of the determinants affecting citizens’ user experience and user satisfaction when mental health services supported by chatbots are provided. Thus, based on the Theory of Consumption Values (TCV), this study proposes an analytical framework to investigate the factors that are important to citizens’ user experience and user satisfaction when they interact with mental health chatbots. Analysis of data collected from 295 chatbot users in Wuhan and Chongqing reveals that personalization, enjoyment, learning, and condition are positively related to user experience and user satisfaction. However, voice interaction fails to devote to citizens’ user experience and user satisfaction. Thus, government agencies and their AI service contractors should enhance the functions and systems of mental health chatbots to ensure citizens’ user experience and user satisfaction. Also, they should more positively promote the use of mental health chatbots during the public health emergency.","","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-05-01","","","Information and Communication Technology","","",""
"uuid:2d5ded6c-ad19-4889-bdf4-e6d7b7883213","http://resolver.tudelft.nl/uuid:2d5ded6c-ad19-4889-bdf4-e6d7b7883213","Changing Civil Servants' Awareness about Open Data Using a Collaborative Digital Game","Di Staso, D. (TU Delft Information and Communication Technology); Kleiman, F. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Lee, Jooho (editor); Pereira, Gabriela Viale (editor); Hwang, Sungsoo (editor)","2021","According to open government principles, public administration should make its data available to the public to create transparency, accountability, and to facilitate participation in public decision-making. Open-Data Policies (ODPs) were developed to encourage the opening of governmental data to the public, but require collaboration and awareness from all levels of government. Gaming has proved to be successful for creating awareness. Yet the pandemic hinders in-person gameplay, and there is a need for an online game that can be played remotely. This research uses an in-person game as the starting point to develop an online collaborative digital game. The feature and design choices of the digital game are described, along with its main differences when compared to the in-person one. The essential features include interaction and discussion about open data among players, the assignment of different roles, and points awarded when making the right decision to open, partially share, or close a dataset.","collaborative learning; covid-19; gaming; open data; open data policy; serious games","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:b16fb429-15fe-4462-9e4a-ecceb4501c5c","http://resolver.tudelft.nl/uuid:b16fb429-15fe-4462-9e4a-ecceb4501c5c","The Giant Leap for Smart Cities: Scaling Up Smart City Artificial Intelligence of Things (AIoT) Initiatives","Kuğuoğlu, B.K. (Student TU Delft); van der Voort, H.G. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2021","Despite the promise of AI and IoT, the efforts of many organizations at scaling smart city initiatives fall short. Organizations often start by exploring the potential with a proof-of-concept and a pilot project, with the process later grinding to a halt for various reasons. Pilot purgatory, in which organizations invest in small-scale implementations without them realizing substantial benefits, is given very little attention in the scientific literature relating to the question of why AI and IoT initiatives fail to scale up for smart cities. By combining extensive study of the literature and expert interviews, this research explores the underlying reasons why many smart city initiatives relying on Artificial Intelligence of Things (AIoT) fail to scale up. The findings suggest that a multitude of factors may leave organizations ill prepared for smart city AIoT solutions, and that these tend to multiply when cities lack much-needed resources and capabilities. Yet many organizations tend to overlook the fact that such initiatives require them to pay attention to all aspects of change: strategy, data, people and organization, process, and technology. Furthermore, the research reveals that some factors tend to be more influential in certain stages. Strategic factors tend to be more prominent in the earlier stages, whereas factors relating to people and the organization tend to feature later when organizations roll out solutions. The study also puts forward potential strategies that companies can employ to scale up successfully. Three main strategic themes emerge from the study: proof-of-value, rather than proof-of-concept; treating and managing data as a key asset; and commitment at all levels.","AIoT; Artificial intelligence; Artificial intelligence of things; Barriers to scale up; Data governance; Internet of things; Scaling up; Smart city; Strategy; Sustainable","en","journal article","","","","","","","","","","","Organisation & Governance","","",""
"uuid:c1772715-4c6a-446c-a28b-97e939bb4176","http://resolver.tudelft.nl/uuid:c1772715-4c6a-446c-a28b-97e939bb4176","Smart parking management system with dynamic pricing","Mondal, Md Ashifuddin (Narula Institute of Technology; Aliah University); Rehena, Zeenat (Aliah University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2021","Smart parking is becoming more and more an integral part of smart city initiatives. Utilizing and managing parking areas is a challenging task as space is often limited, finding empty spaces are hard and citizens want to park their vehicles close to their preferred places. This becomes worse in important/posh areas of major metropolitan cities during rush hour. Due to unavailability of proper parking management system, citizens have to roam around a lot in order to find a suitable parking area. This leads to the wastage of valuable time, unnecessary fuel consumption and environmental pollution. This paper proposes a smart parking management system (SPMS) based on multiple criteria based parking space reservation algorithm (MCPR) that allows the driver/owner of vehicles to find and reserve most appropriate parking space from anywhere at any time. The system also considers the concept of dynamic pricing strategy for calculating parking charge in order to gain more revenue by the government agencies as well as private investors. The system employs sensors to calculate concentration index, average inter-arrival time of vehicles of a parking area for better parking management and planning. The simulation results show that proposed system reduces the average extra driving required by the users to find a parking area and hence it will reduce traffic congestion, which in turn reduces air pollution caused by unnecessary driving to find a proper parking area.","Dynamic pricing; IoT; Sensors; Smart cities; Smart parking; Traffic congestion","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-05-23","","","Information and Communication Technology","","",""
"uuid:a801db0f-b66e-42ad-abc4-def9ba844739","http://resolver.tudelft.nl/uuid:a801db0f-b66e-42ad-abc4-def9ba844739","Trustworthy and Sustainable Edge AI: A Research Agenda","Ding, Aaron Yi (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Crowcroft, Jon (University of Cambridge)","","2021","As a fast evolving domain that merges edge computing, data analytics and AI/ML, commonly referred as Edge AI, the community of Edge AI is establishing and gradually finds its way to connect with mainstream research communities of distributed systems, IoT, and embedded machine learning. Meanwhile, despite of its well-claimed potential to transform cloud and IoT industry, Edge AI is still a complex subject that faces critical challenges from the trustworthy and sustainable concerns. To shed light on these pressing matters, this paper aims to develop a research agenda for trustworthy and sustainable Edge AI. We clarify the concepts, define the proper scoping and propose a research agenda for Edge AI to be trustworthy and sustainable. To illustrate the research agenda in practice, we highlight two active RD projects: the SPATIAL project on trustworthy Edge AI and the APROPOS project on sustainable computing. The projects serve as concrete use cases to explore the agenda development. Our goal is to equip researchers, engineers, service providers, government and public sectors with a better understanding of the underlying concepts and to raise awareness of emerging directions in trustworthy and sustainable Edge AI.","Edge AI; Edge computing; IoT; sustainable AI; trustworthiness","en","conference paper","Institute of Electrical and Electronics Engineers (IEEE)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-10-14","","","Information and Communication Technology","","",""
"uuid:92e56374-fcfd-4d32-ae4c-82d2c5e79878","http://resolver.tudelft.nl/uuid:92e56374-fcfd-4d32-ae4c-82d2c5e79878","Can inner and outer containment counteract pulls and pushes toward delinquency? A test of Walter Reckless’s containment theory","Janssen, H.J. (TU Delft Urban Studies); Bruinsma, Gerben J.N. (Netherlands Institute for the Study of Crime and Law Enforcement (NSCR)); Weerman, Frank M. (Netherlands Institute for the Study of Crime and Law Enforcement (NSCR); Erasmus Universiteit Rotterdam)","","2021","The aim of the current study is to provide an empirical test of containment theory of Walter Reckless (1899–1988). The theory proposes that outer and inner containment hold adolescents back from delinquency even when external factors pull and push them toward it. This early control theory was ahead of its time, but never received the empirical attention it deserves. This article outlines the core theoretical concepts and the basic propositions in order to empirically examine their validity. We employed hybrid linear regression analysis using longitudinal survey data of 612 adolescents (12–18 years old) in the city of The Hague, the Netherlands. The results indicate that outer and inner containment can be meaningfully distinguished, and that several but not all propositions of the theory are supported. Inner and outer containment function as a buffer against external pulls and are able to counteract the effect of increases in environmental pulls during adolescence. We conclude that containment theory is still a promising interaction theory that can help us understand why adolescents who experience external pulls toward delinquency are able to resist these influences.","Containment theory; delinquency; inner containment; outer containment","en","journal article","","","","","","","","","","","Urban Studies","","",""
"uuid:8b4950fb-1186-48bd-95c1-4e0e14dcc05d","http://resolver.tudelft.nl/uuid:8b4950fb-1186-48bd-95c1-4e0e14dcc05d","Digital government transformation: A structural equation modelling analysis of driving and impeding factors","Tangi, Luca (Politecnico di Milano); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Benedetti, Michele (Politecnico di Milano); Noci, Giuliano (Politecnico di Milano)","","2021","Digital technologies are transforming the public sector by affecting applications, processes, culture, structure, and civil servants’ responsibilities and tasks. Yet, there is a void in research about driving and impeding factors influencing digital government transformation (DGT). The article contributes to the current debate on DGT by quantitatively assessing the transformation and its driving and impeding factors. The analyses were performed by collecting and analyzing through structural equation modeling 491 answers to a survey to Italian administrations. Results show that DGT is influenced by a combination of different factors, including the sense of urgency, the need for change, and the creation of a collaborative environment, suggesting that more effort is required for including public managers in the current debate on DGT. Organizational barriers and lack of support are impeding factors. Finally and counter-intuitively, resistance to change was not found to impede the transformation.","Barriers; Digital transformation; E-government; Enablers; T-government","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-10-27","","","Information and Communication Technology","","",""
"uuid:03e96c6f-8232-4e30-b620-3dd0d44dbdf4","http://resolver.tudelft.nl/uuid:03e96c6f-8232-4e30-b620-3dd0d44dbdf4","Blockchain in Service Management and Service Research: Developing a Research Agenda and Managerial Implications","Rikken, O.K. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Roosenboom-Kwee, Z. (TU Delft Economics of Technology and Innovation); Büttgen, Marion (University of Hohenheim); Dicenta, Julia (University of Hohenheim); Spohrer, Kai (University of Mannheim); Venkatesh, Viswanath (Virginia Tech); Raman, Rajalakshmi (Virginia Tech); Hoehle, Hartmut (University of Mannheim); De Keyser, Arne (EDHEC Business School)","","2021","As blockchain technology is maturing to be confidently used in practice, its applications are becoming evident and, correspondingly, more blockchain research is being published, also extending to more domains than before. To date, scientific research in the field has predominantly focused on subject areas such as finance, computer science, and engineering, while the area of service management has largely neglected this topic. Therefore, we invited a group of renowned scholars from different academic fields to share their views on emerging topics regarding blockchain in service management and service research. Their individual commentaries and conceptual contributions refer to different theoretical and domain perspectives, including managerial implications for service companies as well as forward-looking suggestions for further research.","blockchain; distributed ledger; flash loans; governance; disintermediation; privacy; security; service ecosystems; smart contracts; technology adoption; transparency; trust; universal wallets; value creation","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:74960ff9-40b8-4d3e-9a5a-11fe1edbc92e","http://resolver.tudelft.nl/uuid:74960ff9-40b8-4d3e-9a5a-11fe1edbc92e","BresDefender: A potential emergency measure to prevent or postpone a dike breach","Janssen, D. (TU Delft Hydraulic Structures and Flood Risk; Netherlands Defence Academy); Schmets, A.J.M. (Netherlands Defence Academy); Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk); Dado, E. (Netherlands Defence Academy); Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk)","","2021","Dikes are designed to withstand a load, with a certain finite probability of occurrence. In case of crises regarding to flood safety, the military is expected to prevent low-laying areas against flooding. Historical attempts show that the effectiveness of emergency measures and strategies are mainly successful caused by the adequate acts of the local people in charge. Based on a literature analysis of breach development, the available time for the application of emergency measures is estimated. This paper introduces the BresDefender strategy, an emergency response strategy, used by the military, to prevent or postpone dike failure. The current BresDefender strategy is a floating pontoon, which can placed on a weakened dike section. It is expected that it can be applied during two scenario’s. In the first scenario, the BresDefender is applied during the early stages of breach formation. In the second scenario, it restores the original crest height, where overflow is expected in the near future e.g. in case of macro instability. The BresDefender is expected to stabilize the weakened dike section.","","en","conference paper","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:5dfcd748-6246-4862-aad5-06b7ec3845dc","http://resolver.tudelft.nl/uuid:5dfcd748-6246-4862-aad5-06b7ec3845dc","A Reference Architecture for Blockchain-Based Crowdsourcing Platforms","Gong, Y. (Wuhan University); van Engelenburg, S.H. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2021","Companies increasingly tender knowledge-intensive tasks using crowdsourcing platforms to gain access to scarce knowledge and skills otherwise out of reach, and in this way, gaining competitive advantage. Despite its potential, existing crowdsourcing platforms encounter several challenges, including (1) fragmentation of expertise, as there are many platforms, (2) distrust between task providers and crowdsourcing participants, as identity and past performance are often not known, and (3) inability to learn from experience due to a lack of openness. A reference architecture for blockchain-based knowledge-intensive crowdsourcing platforms to mediate transactions between demand and supply of knowledge is designed in this paper to overcome these challenges. A design science research method is followed to develop the architecture. The reference architecture shows how blockchain and smart contract components can be integrated to support and coordinate knowledge-intensive crowdsourcing activities. By removing traditional e-commerce intermediaries, blockchain reduces search friction, knowledge transfer costs, and cheating by task providers or crowdsourcing participants.","Blockchain; Crowdsourcing; Design science; Disintermediation; Knowledge-based view; Market; Search friction; Smart contract","en","journal article","","","","","","","","","","","Organisation & Governance","","",""
"uuid:04a2a6f4-e82b-4108-8361-12cc9174f579","http://resolver.tudelft.nl/uuid:04a2a6f4-e82b-4108-8361-12cc9174f579","Preface: Electronic Government","Scholl, Hans Jochen (University of Washington); Gil-Garcia, J. Ramon (University at Albany - State University of New York); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Kalampokis, Evangelos (University of Macedonia; Centre for Research and Technology-Hellas); Lindgren, Ida (Linköping University); Bolívar, Manuel Pedro Rodríguez (Universidad de Granada)","","2021","","","en","contribution to periodical","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:e2ca2d52-8645-4fe5-b6dc-58594c8caeee","http://resolver.tudelft.nl/uuid:e2ca2d52-8645-4fe5-b6dc-58594c8caeee","Analysis of multipath channel delay estimation using subspace fitting","Kazaz, T. (TU Delft Signal Processing Systems); Romme, J.P.A. (Holst Centre); Janssen, G.J.M. (TU Delft Signal Processing Systems); van der Veen, A.J. (TU Delft Signal Processing Systems)","","2021","The presence of rich scattering in indoor and urban radio propagation scenarios may cause a high arrival density of multipath components (MPCs). Often the MPCs arrive in clusters at the receiver, where MPCs within one cluster have similar angles and delays. The MPCs arriving within a single cluster are typically unresolvable in the delay domain. In this paper, we analyze the effects of unresolved MPCs on the bias of the delay estimation with a multiband subspace fitting algorithm. We treat the unresolved MPCs as a model error that results in perturbed subspace estimation. Starting from the first-order approximation of the perturbations, we derive the bias of the delay estimate of the line-of-sight (LOS) component. We show that it depends on the power and relative delay of the unresolved MPCs in the first cluster compared to the LOS component. Numerical experiments are included to show that the derived expression for the bias well describes the effects of unresolved MPCs on the delay estimation.","time-of-arrival; channel estimation; superresolution; subspace fitting; error analysis; bias; super-resolution","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-12-03","","","Signal Processing Systems","","",""
"uuid:1cbe7339-de63-49f1-b93c-5352a6f96768","http://resolver.tudelft.nl/uuid:1cbe7339-de63-49f1-b93c-5352a6f96768","Urban Socio-Economic Segregation and Income Inequality: A Global Perspective","Tammaru, T. (TU Delft Urban Studies; University of Tartu); Ubareviciene, Ruta (TU Delft Urban Studies; Lithuanian Centre for Social Sciences); Janssen, H.J. (TU Delft Urban Studies)","van Ham, M. (editor)","2021","This open access book investigates the link between income inequality and socio-economic residential segregation in 24 large urban regions in Africa, Asia, Australia, Europe, North America, and South America. It offers a unique global overview of segregation trends based on case studies by local author teams. The book shows important global trends in segregation, and proposes a Global Segregation Thesis.
Rising inequalities lead to rising levels of socio-economic segregation almost everywhere in the world. Levels of inequality and segregation are higher in cities in lower income countries, but the growth in inequality and segregation is faster in cities in high-income countries. This is causing convergence of segregation trends. Professionalisation of the workforce is leading to changing residential patterns. High-income workers are moving to city centres or to attractive coastal areas and gated communities, while poverty is increasingly suburbanising. As a result, the urban geography of inequality changes faster and is more pronounced than changes in segregation levels. Rising levels of inequality and segregation pose huge challenges for the future social sustainability of cities, as cities are no longer places of opportunities for all.","Socio-Economic Segregation; Residential Segregation; Dissimiliarity Index; Income Inequality; Occupational Categories; Socio-Economic Group; GINI-index; Large Cities / Metropoles; Neighbourhood Change","en","book","Springer","978-3-030-64568-7","","","","","","","","Urbanism","Urban Studies","","",""
"uuid:db6a952e-ee9f-4876-a880-cb5bbec2f293","http://resolver.tudelft.nl/uuid:db6a952e-ee9f-4876-a880-cb5bbec2f293","Rising Inequalities and a Changing Social Geography of Cities: An Introduction to the Global Segregation Book","van Ham, M. (TU Delft Urbanism; University of St Andrews); Tammaru, T. (TU Delft Urban Studies; University of Tartu); Ubareviciene, Ruta (TU Delft Urban Studies; Lithuanian Centre for Social Sciences); Janssen, H.J. (TU Delft Urban Studies)","van Ham, Maarten (editor); Tammaru, Tiit (editor); Ubarevičienė, Rūta (editor); Janssen, Heleen (editor)","2021","The book “Urban Socio-Economic Segregation and Income Inequality: a Global Perspective” investigates the link between income inequality and residential segregation between socio-economic groups in 24 large cities and their urban regions in Africa, Asia, Australia, Europe, North America, and South America. Author teams with in-depth local knowledge provide an extensive analysis of each case study city. Based on their findings, the main results of the book can be summarised as follows. Rising inequalities lead to rising levels of socio-economic segregation almost everywhere in the world. Levels of inequality and segregation are higher in cities in lower income countries, but the growth in inequality and segregation is faster in cities in high-income countries, which leads to a convergence of global trends. In many cities the workforce is professionalising, with an increasing share of the top socio-economic groups. In most cities the high-income workers are moving to the centre or to attractive coastal areas, and low-income workers are moving to the edges of the urban region. In some cities, mainly in lower income countries, high-income workers are also concentrating in out-of-centre enclaves or gated communities. The urban geography of inequality changes faster and is more pronounced than city-wide single-number segregation indices reveal. Taken together, these findings have resulted in the formulation of a Global Segregation Thesis.","Socio-economic segregation; Income inequality; Residential segregation; Global segregation thesis","en","book chapter","Springer","","","","","","","","","Urbanism","Urban Studies","","",""
"uuid:7a8e424f-8544-4cce-8677-9574f5dd34c3","http://resolver.tudelft.nl/uuid:7a8e424f-8544-4cce-8677-9574f5dd34c3","The Future of Information Systems in a Post-COVID World by TC8 (Information Systems)","Ramos, Isabel (University of Minho); Mackrell, Dale (Griffith University); van der Merwe, Alta (University of Pretoria); Pries-Heje, Jan (Roskilde University); Ralyté, Jolita (Université de Genève); Stirna, Janis (Stockholm University); Krogstie, John (Norwegian University of Science and Technology (NTNU)); Jones, M. (TU Delft Electrical Engineering, Mathematics and Computer Science); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Goedicke, M. (editor)","2021","This chapter consists of several sections which contain contributions from members of IFIP Technical Committee 8 (Information Systems). We highlight the accomplishments of Technical Committee 8 (TC8) and its working groups over its 50 years history, and then envisage possible strategies for the future of information systems (IS) in a post-COVID world. This chapter begins with an overall view of the diverse and changing roles of the IS field then moves forward to foresee environmental sustainability and digital glocalization in a post-COVID-19 world. Next, we review the achievements of TC8, the establishment of the working groups within it, and predict what TC8 has to offer into the future. Lastly, we identify the individual working groups of TC8 to detail their activities as important conduits of research and practice in the field of IS over the past 50 years, then imagine the roles of the TC8 working groups in a post-COVID landscape.","Information systems; Organisations; Society; Technical Committee 8; Technology","en","book chapter","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-02-04","Electrical Engineering, Mathematics and Computer Science","","Information and Communication Technology","","",""
"uuid:d0658181-e9db-487e-b060-4d827e91a221","http://resolver.tudelft.nl/uuid:d0658181-e9db-487e-b060-4d827e91a221","Policies for Enhancing Public Trust and Avoiding Distrust in Digital Government During Pandemics: Insights from a Systematic Literature Review","Sevinç Çubuk, E.B. (TU Delft Information and Communication Technology; Adnan Menderes University); Demirdöven, Burcu (Pamukkale University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Saeed, S. (editor)","2021","The coronavirus outbreak (COVID-19) has demonstrated the importance of the state capacity and public policy-making process in managing both the pandemic and the resulting crisis. Trust and/or distrust in the relationship between citizens and authorities can determine the success or failure of states in combating pandemics. The goal of this study is to provide insight into trust and distrust in digital government during pandemics by creating an overview of the scattered knowledge. Accordingly, the chapter creates an overview of the factors influencing trust and distrust in digital government in pandemics. The results showed that factors affecting distrust are mostly associated with problems in the interactions between citizens and public authorities, whereas factors affecting trust address governments’ policy responses and public compliance. The level of trust is a dynamic condition that can either be strengthened or broken. A single factor can result in trust for one person and distrust for another person. Surprisingly, trust and distrust can coexist at the same time. Governments must pursue a balance between trust- and distrust-related factors in times of pandemics to derive the dual benefits of trust and distrust.","Digital government; Distrust; Factors; Pandemics; Systematic literature review; Trust","en","book chapter","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-07-01","","","Information and Communication Technology","","",""
"uuid:cca3ceec-17c1-4187-8167-2ce6d286ece8","http://resolver.tudelft.nl/uuid:cca3ceec-17c1-4187-8167-2ce6d286ece8","A Stakeholders Taxonomy for Opening Government Data Decision-Making","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Shishkov, Boris (editor); Shishkov, Boris (editor); Shishkov, Boris (editor); Shishkov, Boris (editor)","2021","Stakeholders can have different views on the opening of data, and conflicts may arise between them. Several causes of disputes may arise during the decision-making process due to the diverse objectives, interests, and needs among the stakeholders that perceive their desires. Yet, no stakeholder taxonomy exists to guide this decision-making process. Direct and indirect stakeholders include open data providers, software developers, data scientists, privacy experts, decision-makers, users, open data evangelists, software developers, policy-makers and politicians. Using an iterative process, a stakeholders taxonomy was developed by classifying stakeholders based on their varying levels and views on openness. The taxonomy includes unaware, unknowledgeable, resistant, risk-averse, neutral, supportive, expert, champion, and leading roles. Each stakeholder proposes a unique mix of expertise, legitimacy, sense of urgency, perceived possible benefits, and risks. The stakeholder’s taxonomy can help to improve the adoption of the decision-making process to open data.","Decision-making; Open data; Open government data; Stakeholder; Taxonomy","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-01-02","","","Information and Communication Technology","","",""
"uuid:d013ff0d-c29a-47d0-8f20-13711e8fd7a6","http://resolver.tudelft.nl/uuid:d013ff0d-c29a-47d0-8f20-13711e8fd7a6","Planning for Urban Social Sustainability: Towards a Human-Centred Operational Approach","Janssen, C. (TU Delft Practice Chair Urban Area Development); Daamen, T.A. (TU Delft Urban Development Management); Verdaas, J.C. (TU Delft Practice Chair Urban Area Development)","","2021","In Europe, growing concerns about social segregation and social stability have pushed calls to make cities ‘inclusive, safe, resilient and sustainable’ higher on policy agendas. However, how to approach such generic policy objectives and operationalise them for planning practices is still largely unclear. This article makes a conceptual contribution to the operational understanding of social sustainability in urban planning practices. The article argues that, between theoretical concept and operational forms, different evaluative approaches towards social sustainability may be taken. Evaluating three dimensions of policy operationalisations in The Netherlands, we argue that Amartya Sen’s capability approach provides a promising conceptual framework for operationalising social sustainability in cities in Europe and beyond. We compare capabilities with a more commonly applied resource-based conception to show that the former is more accurate and potentially more effective, because it shifts the evaluative space of social sustainability from means (i.e., urban resources) to ends the eventual well-being of urban citizens","Capability approach; Operationalisation; Social sustainability; The Netherlands; Urban planning practices","en","journal article","","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:0755a907-9b85-4d24-b1c7-637c8f65a341","http://resolver.tudelft.nl/uuid:0755a907-9b85-4d24-b1c7-637c8f65a341","Comprehensive diagnostics of acute myeloid leukemia by whole transcriptome RNA sequencing","Arindrarto, Wibowo (Leiden University Medical Center); Borràs, Daniel M. (GenomeScan; Leiden University Medical Center); de Groen, Ruben A.L. (Leiden University Medical Center); van den Berg, Redmar R. (Leiden University Medical Center); Locher, Irene J. (Leiden University Medical Center); van Diessen, Saskia A.M.E. (Leiden University Medical Center); Valk, Peter J.M. (Erasmus MC); Janssen, Bart (GenomeScan); van den Akker, E.B. (TU Delft Pattern Recognition and Bioinformatics; Leiden University Medical Center)","","2021","Acute myeloid leukemia (AML) is caused by genetic aberrations that also govern the prognosis of patients and guide risk-adapted and targeted therapy. Genetic aberrations in AML are structurally diverse and currently detected by different diagnostic assays. This study sought to establish whole transcriptome RNA sequencing as single, comprehensive, and flexible platform for AML diagnostics. We developed HAMLET (Human AML Expedited Transcriptomics) as bioinformatics pipeline for simultaneous detection of fusion genes, small variants, tandem duplications, and gene expression with all information assembled in an annotated, user-friendly output file. Whole transcriptome RNA sequencing was performed on 100 AML cases and HAMLET results were validated by reference assays and targeted resequencing. The data showed that HAMLET accurately detected all fusion genes and overexpression of EVI1 irrespective of 3q26 aberrations. In addition, small variants in 13 genes that are often mutated in AML were called with 99.2% sensitivity and 100% specificity, and tandem duplications in FLT3 and KMT2A were detected by a novel algorithm based on soft-clipped reads with 100% sensitivity and 97.1% specificity. In conclusion, HAMLET has the potential to provide accurate comprehensive diagnostic information relevant for AML classification, risk assessment and targeted therapy on a single technology platform.","","en","journal article","","","","","","","","","","","Pattern Recognition and Bioinformatics","","",""
"uuid:4c554e3c-d9f9-4465-8c6d-a665529d1873","http://resolver.tudelft.nl/uuid:4c554e3c-d9f9-4465-8c6d-a665529d1873","Seismic velocity characterisation and survey design to assess CO2 injection performance at Kızıldere geothermal field","PARLAKTUNA, Mahmut (Middle East Technical University); Durucan, Sevket (Imperial College London); PARLAKTUNA, Burak (Middle East Technical University); SINAYUÇ, Çağlar (Middle East Technical University); Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics); ŞENTÜRK, Erdinç (ZORLU Energy); TONGUÇ, Erinç (ZORLU Energy); DEMİRCİOĞLU, Öncü (ZORLU Energy); POLETTO, Flavio (OGS-National Institute of Oceanography and Applied Geophysics–)","","2021","The noncondensable gases in most geothermal resources include CO2 and smaller amounts of other gases. Currently, the worldwide geothermal power is a small sector within the energy industry, and CO2 emissions related to the utilisation of geothermal resources are consequently small. In some countries, however, such as Turkey and Iceland, geothermal energy production contributes significantly to their energy budget, and their CO2 emissions are relatively significant. SUCCEED is a targeted innovation and research project, which aims to investigate the reinjection of CO2 produced at geothermal power production sites and develop, test, and demonstrate at field scale innovative measurement, monitoring and verification (MMV) technologies that can be used in most CO2 geological storage projects. The project is carried out at two operating geothermal energy production sites, the Kızıldere geothermal field in Turkey and the CarbFix project site at the Hellisheiði geothermal field in Iceland. Together with a brief description of the project, this paper presents the details of the two field sites and the progress made in seismic velocity characterisation and modelling relevant to the Kızıldere geothermal field in Turkey.","Geothermal energy; CO2 emissions; CO2 utilisation and storage; Kızıldere","en","journal article","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:374ead29-6fa8-45b2-a996-1d92e72f29cb","http://resolver.tudelft.nl/uuid:374ead29-6fa8-45b2-a996-1d92e72f29cb","Evaluation of a Pilot Game to Change Civil Servants’ Willingness Towards Open Data Policy Making","Kleiman, F. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Meijer, Sebastiaan (KTH Royal Institute of Technology)","Wardaszko, Marcin (editor); Meijer, Sebastiaan (editor); Lukosch, Heide (editor); Kanegae, Hidehiko (editor); Kriz, Willy Christian (editor); Grzybowska-Brzezińska, Mariola (editor)","2021","The adoption of open data policy-making by governments is limited due to different types of constraints. Civil servants are reluctant to open their data to the public for many reasons. The lack of knowledge of benefits that can be produced by the release of data and the overestimation of risks and operational complexity seems to decrease their willingness to support the opening of data. The idea that a serious game intervention can change awareness of participants in different domains is already known. Yet, games are domain dependent and concepts differ per domain. A game has never been used for the emerging domain of open data in which civil servants are operating in a bureaucratic environment having a risk-averse culture and strict institutional rules. A role-playing game prototype was designed for civil servants to experience open data policy-making. This paper analyses its first results aiming at changes of perception for the participants of the game and aims to understand the changes in behavior of civil servants that played it. For some participants, the game influenced their attitude, whereas others were not influenced. Suggesting that different approaches might be necessary for changing the attitude of different groups.","Design; Game; Open data; Open government; Quasi-experiment; Survey","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-09-27","","","Information and Communication Technology","","",""
"uuid:362c81c6-20fd-444d-9e37-d8c88aff264e","http://resolver.tudelft.nl/uuid:362c81c6-20fd-444d-9e37-d8c88aff264e","A Digital Game to Learn About Open Data","Di Staso, D. (TU Delft Information and Communication Technology); Kleiman, F. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Scholl, Hans Jochen (editor); Gil-Garcia, J. Ramon (editor); Janssen, Marijn (editor); Kalampokis, Evangelos (editor); Kalampokis, Evangelos (editor); Lindgren, Ida (editor); Rodríguez Bolívar, Manuel Pedro (editor)","2021","The implementation of open data policies requires the efforts of many public employees across different levels of government, who may be unaware of the benefits and risks of open data. Serious games have demonstrated potential for training in a professional environment. For this research, a collaborative digital serious game about open data was developed. A sample of 24 civil servants played the game. Pre-test and post-test surveys were used to evaluate the effects of the game on participants’ perception of open data. Likert score changes between pre-test and post-test indicated that the game had a positive effect on the willingness to share public sector data. By simulating the setting of a public office and by having players make decisions about whether to open certain datasets, the game facilitated learning about the benefits and disadvantages of opening data.","Covid-19; Gaming; Open data; Open data policy; Serious games","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-02","","","Information and Communication Technology","","",""
"uuid:cee24f98-f110-4962-902c-64e012599d8e","http://resolver.tudelft.nl/uuid:cee24f98-f110-4962-902c-64e012599d8e","A multi-stakeholder approach to eHealth development: Promoting sustained healthy living among cardiovascular patients","Breeman, Linda D. (Universiteit Leiden); Keesman, Mike (Universiteit Leiden); Atsma, Douwe E. (Leiden University Medical Center); Chavannes, N.H. (Leiden University Medical Center); Janssen, Veronica (Universiteit Leiden; Leiden University Medical Center); van Gemert-Pijnen, Lisette (University of Twente); Reijnders, T. (Universiteit Leiden); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden); Scholte op Reimer, W. (Amsterdam UMC; Hogeschool van Amsterdam)","","2021","Background: Healthy living is key in the prevention and rehabilitation of cardiovascular disease (CVD). Yet, supporting and maintaining a healthy lifestyle is exceptionally difficult and people differ in their needs regarding optimal support for healthy lifestyle interventions. Objective: The goals of this study were threefold: to uncover stakeholders’ needs and preferences, to translate these to core values, and develop eHealth technology based on these core values. Our primary research question is: What type of eHealth application to support healthy living among people with (a high risk of) CVD would provide the greatest benefit for all stakeholders? Methods: User-centered design principles from the CeHRes roadmap for eHealth development were followed to guide the uncovering of important stakeholder values. Data were synthesized from various qualitative studies (i.e., literature studies, interviews, think-aloud sessions, focus groups) and usability tests (i.e., heuristic evaluation, cognitive walkthrough, think aloud study). We also developed an innovative application evaluation tool to perform a competitor analysis on 33 eHealth applications. Finally, to make sure to take into account all end-users needs and preferences in eHealth technology development, we created personas and a customer journey. Results: We uncovered 10 universal values to which eHealth-based initiatives to support healthy living in the context of CVD prevention and rehabilitation should adhere to (e.g., providing social support, stimulating intrinsic motivation, offering continuity of care). These values were translated to 14 desired core attributes and then prototype designs. Interestingly, we found that the primary attribute of good eHealth technology was not a single intervention principle, but rather that the technology should be in the form of a digital platform disseminating various interventions, i.e., a ‘one-stop-shop’. Conclusion: Various stakeholders in the field of cardiovascular prevention and rehabilitation may benefit most from utilizing one personalized eHealth platform that integrates a variety of evidence-based interventions, rather than a new tool. Instead of a one-size-fits-all approach, this digital platform should aid the matchmaking between patients and specific interventions based on personal characteristics and preferences.","Cardiovascular disease; eHealth; Health behavior; Lifestyle; Mobile application; User-centered design","en","journal article","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:4c68a23e-7866-4b62-b4a6-44246f3ed9ef","http://resolver.tudelft.nl/uuid:4c68a23e-7866-4b62-b4a6-44246f3ed9ef","Terrestrial precise positioning system using carrier phase from burst signals and optically distributed time and frequency reference","Dun, H. (TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems)","","2021","Terrestrial positioning systems are being investigated as the complement to the global navigation satellite systems (GNSS), to provide precise and reliable positioning services in a GNSS-challenged environment. In this paper, we present the positioning performance of a ground-based positioning system, in which a multiband OFDM burst is used as a ranging signal to estimate carrier phase, and all transmitters are tightly synchronized by optically distributed time and frequency reference signals. The receiver, like in GNSS, runs on its own clock. An experiment has been carried out in an outdoor living lab environment to demonstrate the flexibility of precise positioning using carrier phase with the proposed ground-based system. During the experiment, the receiver was moved over a trajectory of 17 m forth and back, and acquired the ranging signal for 71 seconds. Without calibrating the different initial phase offsets among the transmitters, we keep the carrier phase cycle ambiguities as float numbers and compute the so called float position solutions. The root mean-squared error (RMSE) of the position solution in East and North direction are 4.22 cm and 4.63 cm, respectively, demonstrating the high-accuracy potential of the proposed burst oriented hybrid optical-wireless terrestrial positioning system.","","en","conference paper","Institute of Navigation","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:e3307580-bd67-448d-97ba-29938c50e07a","http://resolver.tudelft.nl/uuid:e3307580-bd67-448d-97ba-29938c50e07a","A unifying characterization of tree-based networks and orchard networks using cherry covers","van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization; Centrum Wiskunde & Informatica (CWI)); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization); Zeh, Norbert (Dalhousie University)","","2021","Phylogenetic networks are used to represent evolutionary relationships between species in biology. Such networks are often categorized into classes by their topological features, which stem from both biological and computational motivations. We study two network classes in this paper: tree-based networks and orchard networks. Tree-based networks are those that can be obtained by inserting edges between the edges of an underlying tree. Orchard networks are a recently introduced generalization of the class of tree-child networks. Structural characterizations have already been discovered for tree-based networks; this is not the case for orchard networks. In this paper, we introduce cherry covers—a unifying characterization of both network classes—in which we decompose the edges of the networks into so-called cherry shapes and reticulated cherry shapes. We show that cherry covers can be used to characterize the class of tree-based networks as well as the class of orchard networks. Moreover, we also generalize these results to non-binary networks.","Graph theory; Phylogenetic networks; Phylogenetics","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:6bef6a41-6179-44a7-a24e-e3bb55cbe7f8","http://resolver.tudelft.nl/uuid:6bef6a41-6179-44a7-a24e-e3bb55cbe7f8","Design principles for creating digital transparency in government","Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Janowski, Tomasz (Politechnika Gdanska; Danube University Krems)","","2021","Under pressure to fight corruption, hold public officials accountable, and build trust with citizens, many governments pursue the quest for greater transparency. They publish data about their internal operations, externalize decision-making processes, establish digital inquiry lines to public officials, and employ other forms of transparency using digital means. Despite the presence of many transparency-enhancing digital tools, putting such tools together to achieve the desired level of digital transparency, to design entire government systems for digital transparency, remains challenging. Design principles and other design guides are lacking in this area. This article aims to fill this gap. We identify a set of barriers to digital transparency in government, define 16 design principles to overcome such barriers, and evaluate these principles using three case studies from different countries. Some principles apply to projects, others to systems, yet others to entire organizations. To achieve digital transparency, before building and deploying digital solutions, government organizations should build technological and institutional foundations and use such foundations to organize themselves for transparency. The proposed design principles can help develop and apply such foundations.","Design principles; Digital transparency; Open data; Open government; Transparency; Transparency-by-design; Window theory","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:aa82bce0-9566-4600-be2a-61f8ce316167","http://resolver.tudelft.nl/uuid:aa82bce0-9566-4600-be2a-61f8ce316167","A fully automated approach to calculate the melting temperature of elemental crystals","Zhu, Li Fang (Max-Planck-Institut für Eisenforschung); Janssen, Jan (Max-Planck-Institut für Eisenforschung); Ishibashi, Shoji (Max-Planck-Institut für Eisenforschung; National Institute of Advanced Industrial Science and Technology (AIST)); Körmann, F.H.W. (TU Delft Team Marcel Sluiter; Max-Planck-Institut für Eisenforschung); Grabowski, Blazej (University of Stuttgart); Neugebauer, Jörg (Max-Planck-Institut für Eisenforschung)","","2021","The interface method is a well established approach for predicting melting points of materials using interatomic potentials. However, applying the interface method is tedious and involves significant human intervention. The whole procedure involves several successive tasks: estimate a rough melting point, set up the interface structure, run molecular dynamic calculations and analyze the data. Loop calculations are necessary if the predicted melting point is different from the estimated one by more than a certain convergence criterion, or if full melting/solidification occurs. In this case monitoring the solid–liquid phase transition in the interface structure becomes critical. As different initial random seeds for the molecular dynamic simulations within the interface method induce slightly different melting points, a few ten or hundred interface method calculations with different random seeds are necessary for performing a statistical analysis on these melting points. Considering all these technical details, the work load for manually executing and combining the various involved scripts and programs quickly becomes prohibitive. To simplify and automatize the whole procedure, we have implemented the interface method into pyiron (http://pyiron.org). Our fully automatized procedure allows to efficiently and precisely predict melting points of stable unaries represented by arbitrary potentials with only two user-specified parameters (interatomic potential file and element). For metastable or dynamically unstable unary phases, the crystal structure needs to be provided as an additional parameter. We have applied our automatized approach on fcc Al, Ni, dynamically unstable bcc Ti and hcp Mg and employed a large set of available interatomic potentials. Melting points for classical interatomic potentials of these metals have been obtained with a numerical precision well below 1 K.","Arbitrary potential; Interface method; Melting point; pyiron","en","journal article","","","","","","","","","","","Team Marcel Sluiter","","",""
"uuid:6fdc6897-0883-4fc1-b3c3-f62477324d49","http://resolver.tudelft.nl/uuid:6fdc6897-0883-4fc1-b3c3-f62477324d49","On cherry-picking and network containment","Janssen, R. (TU Delft Discrete Mathematics and Optimization); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization)","","2021","Phylogenetic networks are used to represent evolutionary scenarios in biology and linguistics. To find the most probable scenario, it may be necessary to compare candidate networks. In particular, one needs to distinguish different networks and determine whether one network is contained in another. In this paper, we introduce cherry-picking networks, a class of networks that can be reduced by a so-called cherry-picking sequence. We then show how to compare such networks using their sequences. We characterize reconstructible cherry-picking networks, which are the networks that are uniquely determined by the sequences that reduce them, making them distinguishable. Furthermore, we show that a cherry-picking network is contained in another cherry picking network if a sequence for the latter network reduces the former network, provided both networks can be reconstructed from their sequences in a similar way (i.e., they are in the same reconstructible class). Lastly, we show that the converse of the above statement holds for tree-child networks, thereby showing that NETWORK CONTAINMENT, the problem of checking whether a network is contained in another, can be solved by computing cherry picking sequences in linear time for tree-child networks.","Cherry-picking networks; Cherry-picking sequences; Linear-time algorithms; Network containment; Phylogenetic networks; Tree containment","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:df311da0-ab43-406f-873b-1eb30b9d2bf7","http://resolver.tudelft.nl/uuid:df311da0-ab43-406f-873b-1eb30b9d2bf7","Understanding the evolution of open government data research: towards open data sustainability and smartness","Gao, Y. (TU Delft Information and Communication Technology; Huazhong University of Science and Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Zhang, Congcong (Huazhong University of Science and Technology)","","2021","The past decade has witnessed a rapid development of open government data practices and academic research. However, there is no systematic survey of existing research to understand the evolution of open government data. Such research can facilitate knowledge transfer within and across domains, and foster learning for countries in the early stages of open government data development. This study quantitively extracted the evolution trajectory of open government data based on the main path analysis method and then analysed the underlying motivations. The results show that open government data research went through four main phases and that the open government data movement has spread towards developing countries and smart cities. Different challenges and issues faced by the researchers in each phase drove the evolution of open government data research. Finally, we discuss future directions of open government data research based on our findings and recent development. There is a tendency to create sustainable open government data and smartness by employing artificial intelligence and creating data marketplaces. Points for practitioners: Open government data efforts have evolved over the years into a global phenomenon. Countries have learned from each other and more and more efforts are focused on innovating with open government data by stimulating co-creation and using other incentives. The way that data are opened should focus on achieving goals like innovation, participation, transparency and accountability. There is a tendency to create sustainable open government data and smartness by employing artificial intelligence and creating data marketplaces.","bibliometric analysis; open data smartness and sustainability; open government; systematic literature research","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:86e675f4-ace0-498d-9493-b198c35db3db","http://resolver.tudelft.nl/uuid:86e675f4-ace0-498d-9493-b198c35db3db","Neighbourhood deprivation and the Big Five personality traits: associations with adolescent problem behaviour and educational attainment","Nieuwenhuis, Jaap (Zhejiang University; Rijksuniversiteit Groningen); Kleinepier, Tom (ABF Research); Janssen, H.J. (Max Planck Institute for the Study of Crime, Security and Law, Freiburg); van Ham, M. (TU Delft Urbanism; University of St Andrews)","","2021","We studied the relation between cumulative exposure to neighbourhood deprivation and adolescents’ Big Five personality traits, and the moderating role of personality in the relation between neighbourhood deprivation and the development of problem behaviour and educational attainment. We studied 5365 British adolescents from ages 10 to 16, with neighbourhood information from birth onwards. Extraversion, agreeableness, emotional stability, and openness to experience moderated the relation between deprivation and problem behaviour. For educational attainment, only extraversion was a moderator. This means that higher values on personality traits were related to weaker relations between neighbourhood deprivation and problem behaviour and educational attainment. The results showed the importance of taking into account adolescents’ personality when assessing developmental outcomes in relation to neighbourhood deprivation.","ALSPAC; Big five personality traits; Educational attainment; Neighbourhood deprivation; Problem behaviour","en","journal article","","","","","","","","","","Urbanism","","","",""
"uuid:6febb710-4c1b-4102-9bd6-46ba207f6415","http://resolver.tudelft.nl/uuid:6febb710-4c1b-4102-9bd6-46ba207f6415","Public and private value creation using artificial intelligence: An empirical study of AI voice robot users in Chinese public sector","Wang, Changlin (Henan University of Economics and Law); Teo, Thompson S.H. (National University of Singapore); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2021","Despite significant theoretical and empirical attention on public value creation in the public sector, the relationship between artificial intelligence (AI) use and value creation from the citizen perspective remains poorly understood. We ground our study in Moore's public value management to examine the relationship between AI use and value creation. We conceptually categorize public service value into public value and private value. We use procedural justice and trust in government as indicators of public value and, based on motivation theory, we use perceived usefulness and perceived enjoyment as indicators of private value. A field survey of 492 AI voice robot users in China was conducted to test our model. The results indicated that the effective use of AI voice robots was significantly associated with private value and procedural justice. However, the relationship between the effective use of AI and trust in government was not found to be significant. Surprisingly, the respondents indicated that private value had a greater effect on overall value creation than public value. This contrasts with the common idea that value creation from the government perspective suggests that social objectives requiring public value are more important to citizens. The results also show that gender and citizens with different experiences show different AI usage behaviors.","Artificial intelligence; Private value; Public value; Value creation; Voice robot","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-02-09","","","Information and Communication Technology","","",""
"uuid:d7827093-ed5d-41cc-840c-eb5c1cd58c3f","http://resolver.tudelft.nl/uuid:d7827093-ed5d-41cc-840c-eb5c1cd58c3f","Seismic velocity characterisation of geothermal reservoir rocks for CO2 storage performance assessment","Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics); Barnhoorn, A. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Wolf, K.H.A.A. (TU Delft Applied Geophysics and Petrophysics); Durucan, Sevket (Imperial College London)","","2021","As part of a seismic monitoring project in a geothermal field, where the feasibility of re-injection and storage of produced CO2 is being investigated, a P-and S-wave seismic velocity characterisation study was carried out. The effect of axial (up to 95 MPa) and radial (up to 60 MPa) stress on the seismic velocity was studied in the laboratory for a broad range of dry sedimentary and metamorphic rocks that make up the Kızıldere geothermal system in Turkey. Thin section texture analyses conducted on the main reservoir formations, i.e., marble and calcschist, confirm the importance of the presence of fractures in the reservoir: 2D permeability increases roughly by a factor 10 when fractures are present. Controlled acoustic-assisted unconfined and confined compressive strength experiments revealed the stress-dependence of seismic velocities related to the several rock formations. For each test performed, a sharp increase in velocity was observed at relatively low absolute stress levels, as a result of the closure of microcracks, yielding an increased mineral-to-mineral contact area, thus velocity. A change in radial stress appeared to have a negligible impact on the resulting P-wave velocity, as long as it exceeds atmospheric pressure. The bulk of the rock formations studied showed reducing P-wave velocities as function of increasing temperature due to thermal expansion of the constituting minerals. This effect was most profound for the marble and calcschist samples investigated.","Acoustic measurements; CO storage; Geothermal reservoir; Seismic monitoring; Seismic velocity characterisation","en","journal article","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:6955de61-d81f-4786-845f-a760bdf763c3","http://resolver.tudelft.nl/uuid:6955de61-d81f-4786-845f-a760bdf763c3","Publishing Research in Digital Government: A Discussion with Editors-in-Chief of Key Journals","Tambouris, Efthimios (University of Macedonia, Thessaloniki); Chen, Yu Che (University of Nebraska, Omaha); Chun, Soon Ae (City University of New York); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Meijer, Albert (Universiteit Utrecht); Rana, Nripendra (Bradford University); Visvizi, Anna (SGH Warsaw School of Economics)","Lee, Jooho (editor); Pereira, Gabriela Viale (editor); Hwang, Sungsoo (editor)","2021","Publishing research in reputable academic journals is an important objective for researchers in digital government, as in any scientific field. Researchers are under constant pressure to publish their work in highly reputable journals. As a result, a number of facts and myths exist regarding publishing in reputable digital government journals. The aim of this panel is to discuss prevalent facts and myths in an attempt to demystify publication of digital government research. For that purpose, editors-in-chief of five key journals in the area have been invited to provide guidance and answer relevant questions.","Digital government; editors-in-chief; journal; research","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Information and Communication Technology","","",""
"uuid:953895c6-5c5c-4983-968a-ff7ea658f17b","http://resolver.tudelft.nl/uuid:953895c6-5c5c-4983-968a-ff7ea658f17b","Coupling Charge and Topological Reconstructions at Polar Oxide Interfaces","van Thiel, T.C. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft); Brzezicki, W. (Jagiellonian University; Polish Academy of Sciences); Autieri, C. (Polish Academy of Sciences); Hortensius, J.R. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft); Afanasiev, D. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft); Janssen, N. (Kavli institute of nanoscience Delft; Student TU Delft); Groenendijk, D.J. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft); Van Aert, S. (Universiteit Antwerpen); Caviglia, A. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft)","","2021","In oxide heterostructures, different materials are integrated into a single artificial crystal, resulting in a breaking of inversion symmetry across the heterointerfaces. A notable example is the interface between polar and nonpolar materials, where valence discontinuities lead to otherwise inaccessible charge and spin states. This approach paved the way for the discovery of numerous unconventional properties absent in the bulk constituents. However, control of the geometric structure of the electronic wave functions in correlated oxides remains an open challenge. Here, we create heterostructures consisting of ultrathin SrRuO3, an itinerant ferromagnet hosting momentum-space sources of Berry curvature, and LaAlO3, a polar wide-band-gap insulator. Transmission electron microscopy reveals an atomically sharp LaO/RuO2/SrO interface configuration, leading to excess charge being pinned near the LaAlO3/SrRuO3 interface. We demonstrate through magneto-optical characterization, theoretical calculations and transport measurements that the real-space charge reconstruction drives a reorganization of the topological charges in the band structure, thereby modifying the momentum-space Berry curvature in SrRuO3. Our results illustrate how the topological and magnetic features of oxides can be manipulated by engineering charge discontinuities at oxide interfaces.","","en","journal article","","","","","","","","","","","QN/Caviglia Lab","","",""
"uuid:d01d5e5f-8f96-44fb-baee-dd1715fb99bd","http://resolver.tudelft.nl/uuid:d01d5e5f-8f96-44fb-baee-dd1715fb99bd","Inclusion through proactive public services: Findings from the Netherlands: Classifying and designing proactivity through understanding service eligibility and delivery processes","Bharosa, Nitesh (Digicampus); Oude Luttighuis, S.F. (Digicampus); Spoelstra, Flori (Digicampus); van der Voort, H.G. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Lee, Jooho (editor); Pereira, Gabriela Viale (editor); Hwang, Sungsoo (editor)","2021","The COVID-19 pandemic highlights the dependence on digital public service delivery in many nations. The intensified use of digital public services also shifted the spotlight to accessibility and reactive design of digital public services. Inspired by the high level of proactivity provided in commercial digital services, policy-makers are looking for guidance on employing the vast amount of (personal) data available at various public agencies to proactively aid citizens during important life events. Proactivity, however, is a very complex multi-level concept with a myriad of case-specific forms and conditions and is not always desired. Moreover, there is little guidance in the literature on how to classify the level of proactivity and design more proactive public services. The objective of this paper is to provide guidance for classifying, understanding, and designing proactivity. Drawing on previous conceptualizations in literature, this paper introduces a proactivity classification framework that is substantiated using empirical cases from the Netherlands. We found that fully proactive services are not always desired or possible due to public service characteristics. The two key variables in this framework - service eligibility and service delivery - were used to propose design principles for increasing public services' proactivity. The principles were validated and prioritized by four public service innovators. Policy-makers looking to enhance inclusivity through service proactivity can start by classifying current services and integrating the design principles in their innovation roadmap.","design principles; digital government; inclusion; proactive government; Proactive services; public service innovation; transformation","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","","Organisation & Governance","","",""
"uuid:36fdf140-ea4a-4110-8636-8ca8f6476488","http://resolver.tudelft.nl/uuid:36fdf140-ea4a-4110-8636-8ca8f6476488","How to ensure control of cooperative vehicle and truck platoons using meaningful human control","Calvert, S.C. (TU Delft Transport and Planning); Mecacci, Giulio (Radboud University Medical Center); Heikoop, Daniel D. (CBR Centraal Bureau Rijvaardigheid); Janssen, Robbert (Transport Beat)","","2021","Vehicle cooperation, not vehicle automation, will yield the greatest benefits on road traffic. However, satisfactory human control over platoons of cooperative vehicles still has a large number of uncertainties and issues to be addressed. This paper aims to address these broader issues of control over a cooperative vehicle platoon by focussing on a truck platooning system as a case example, and taking the perspective of Meaningful Human Control (MHC) as control concept. MHC goes further than mere operational control as it addresses issues that exist in current system designs, and proposes improvements based on a novel and more encompassing set of conditions for control. These issues are addressed in regard to the vehicles and their Operational Design Domains (ODD), the role and ability of the drivers (both leading and following) and how these exist in regard to their road environment. We conclude that current advances are making progress, but that from a MHC perspective, issues still remain for the operational and tactical implementation of truck platoons and cooperative driving that need to be addressed in regard to ODDs and drivers. Furthermore, consideration of responsibility and liability aspects is required that stretches beyond nominal appointment thereof, as this does not satisfy important ethical and societal standards. This is demonstrated in the paper through two hypothetical cases focussing on issues on a system level and one further analysis which is focussed on the role of the driver in the platooning system.","Cooperative driving; Meaningful Human Control; Platooning; Truck platooning","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:16744ca5-a6d5-4af5-b189-76ab23754240","http://resolver.tudelft.nl/uuid:16744ca5-a6d5-4af5-b189-76ab23754240","Mobile services use and citizen satisfaction in government: integrating social benefits and uses and gratifications theory","Wang, Changlin (Henan University of Economics and Law); Teo, Thompson S.H. (National University of Singapore); Dwivedi, Yogesh (Swansea University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2021","Purpose: Citizen satisfaction with the government is a longstanding and continuous concern in public administration. However, past research did not investigate the effect on satisfaction with the government in the context of mobile government (m-government). The purpose of this paper is to evaluate how the social benefits of citizens using m-government affect their satisfaction with the government. Design/methodology/approach: Grounded in the uses and gratifications theory (UGT), the authors suggest that the satisfaction in m-government should be constructed in terms of the satisfaction with m-government and the satisfaction with the government. The research model of citizen satisfaction in the context of m-government is tested through partial least squares (PLS) (SmartPLS 2.0) based on data collected from a survey study in China. Findings: The results indicate that the three important social benefits, e.g. convenience, transparency and participation, are positively associated with process gratification, whereas only convenience is positively associated with content gratification. The results suggest that both process gratification and content gratification are positively associated with citizen satisfaction with the government. Furthermore, the research suggests that process and content gratification have a mediating role, whereas compatibility has a moderating role. Practical implications: This research provides insights to practitioners on how to facilitate citizen satisfaction by increasing citizens’ social benefits and improving process and content gratification. Originality/value: This study contributes to the literature by offering a framework for analyzing the impact of citizens’ use of m-government on their satisfaction with the government. The work also contributes to UGT by categorizing user gratifications into process gratifications, content gratifications and citizen satisfaction with the government.","Citizen satisfaction; Compatibility; E-government; Mobile government; Participation; Transparency; Uses and gratifications theory","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-11-14","","","Information and Communication Technology","","",""
"uuid:24e76949-5c40-4d7e-9175-af610a4c1afc","http://resolver.tudelft.nl/uuid:24e76949-5c40-4d7e-9175-af610a4c1afc","Distinguishing level-1 phylogenetic networks on the basis of data generated by Markov processes","Gross, Elizabeth (University of Hawaii at Manoa); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Long, Colby (The College of Wooster); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization)","","2021","Phylogenetic networks can represent evolutionary events that cannot be described by phylogenetic trees. These networks are able to incorporate reticulate evolutionary events such as hybridization, introgression, and lateral gene transfer. Recently, network-based Markov models of DNA sequence evolution have been introduced along with model-based methods for reconstructing phylogenetic networks. For these methods to be consistent, the network parameter needs to be identifiable from data generated under the model. Here, we show that the semi-directed network parameter of a triangle-free, level-1 network model with any fixed number of reticulation vertices is generically identifiable under the Jukes–Cantor, Kimura 2-parameter, or Kimura 3-parameter constraints.","Identifiability; Markov processes; Phylogenetic networks; Reticulation","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:282e1bcb-b2cc-4a81-abf3-63d3f243e28b","http://resolver.tudelft.nl/uuid:282e1bcb-b2cc-4a81-abf3-63d3f243e28b","Evaluation of Phase Change Materials for Personal Cooling Applications","Teunissen, L.P.J. (TU Delft Emerging Materials; TU Delft Sustainable Design Engineering); Janssen, E.S. (Student TU Delft); Schootstra, J. (Student TU Delft); Plaude, L. (TU Delft Emerging Materials; TU Delft Sustainable Design Engineering); Jansen, K.M.B. (TU Delft Emerging Materials; TU Delft Sustainable Design Engineering)","","2021","Eleven phase change materials (PCMs) for cooling humans in heat-stressed conditions were evaluated for their cooling characteristics. Effects of packaging material and segmentation were also investigated. Sample packs with a different type PCM (water- and oil-based PCMs, cooling gels, inorganic salts) or different packaging (aluminum, TPU, TPU + neoprene) were investigated on a hotplate. Cooling capacity, duration, and power were determined. Secondly, a PCM pack with hexagon compartments was compared to an unsegmented version with similar content. Cooling power decreased whereas cooling duration increased with increasing melting temperature. The water-based PCMs showed a >2x higher cooling power than other PCMs, but were relatively short-lived. The flexible gels and salts did not demonstrate a phase change plateau in cooling power, compromising their cooling potential. Using a TPU or aluminum packaging was indifferent. Adding neoprene considerably extended cooling duration, while decreasing power. Segmentation has practical benefits, but substantially lowered contact area and therefore cooling power.","cooling garment; cooling power; hotplate; PCM; phase change material","en","journal article","","","","","","Accepted Author Manuscript","","","","Sustainable Design Engineering","Emerging Materials","","",""
"uuid:c54448de-a03c-4af0-b103-d3a1f9a287f9","http://resolver.tudelft.nl/uuid:c54448de-a03c-4af0-b103-d3a1f9a287f9","The influence of ICT diffusion and globalization on the quality of governance: A study using panel data from ASEAN countries","Omar, Normah (Universiti Teknologi MARA); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Said, Jamaliah (Universiti Teknologi MARA); Sohag, Kazi (Ural Federal University)","","2021","Information and Communication Technology (ICT) supports the sharing of information to improve the Quality of Governance (QoG). Many studies found a relationship between ICT diffusion and globalization and between ICT diffusion and the Quality of Governance. This study investigates the influence of both ICT diffusion and globalization in explaining the country level QoG while incorporating gross domestic product (GDP) per capita, human capital, and government expenditure in the context of the ASEAN (Association of Southeast Asian Nation) region. To this end, we used Panel Autoregressive Distributed Lags (ARDL) to analyze panel data from 1984 to 2017. In contrast to research conducted in other countries, our research shows that the impact of ICT diffusion on QoG is not significant in the ASEAN region. The findings can be explained by a lack of coherent ICT-strategy among the countries and a lack of institutional mechanisms to ensure ICT efforts’ effectiveness. However, the relationship between globalization and QoG is positive and significant.","ASEAN countries; developing countries; globalization; governance quality; ICT diffusion","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:8bf53f0d-9d8d-4b58-a716-73bcc0bdf067","http://resolver.tudelft.nl/uuid:8bf53f0d-9d8d-4b58-a716-73bcc0bdf067","Understanding Actor Roles in Inter-organizational Digital Public Services","Wouters, Stijn (Katholieke Universiteit Leuven); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Crompvoets, Joep (Katholieke Universiteit Leuven)","Scholl, Hans Jochen (editor); Gil-Garcia, J. Ramon (editor); Janssen, Marijn (editor); Kalampokis, Evangelos (editor); Kalampokis, Evangelos (editor); Lindgren, Ida (editor); Rodríguez Bolívar, Manuel Pedro (editor)","2021","Different actor roles in inter-organizational digital public services are often neither understood nor acknowledged. This can result in challenges regarding the proper design and result in a lack of adoption of these services. In the literature, there exist various taxonomies outlining roles such as users, consumers or co-creators, although their value is limited. We define roles as the expectations regarding the actors and their responsibilities in the governance of a digital public service. The aim of this research is to better understand the various roles in inter-organizational digital service provisioning. This objective is achieved by examining existing classifications and using them to analyze the roles in three inter-organizational cases in Belgium. The multiple-case study reveals natural persons and legal entities often combine several roles. Public administrations have to collaborate to establish inter-organizational digital public services, but might be confronted with different perspectives regarding the end-user or other roles. This might lead to tensions and could have consequences regarding adoption. The results show that intermediary roles performed by non-public sector parties, such as mandate holders or private service providers, are lacking in existing classifications. A novel classification is proposed together with suggestions for the concept of roles, taking a comprehensive view on actor roles in the entire service delivery chain.","Actor roles; E-government; Inter-organizational services; Public service delivery","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-03","","","Information and Communication Technology","","",""
"uuid:0ac18ab9-9aa6-45d0-b394-0172243f5c4c","http://resolver.tudelft.nl/uuid:0ac18ab9-9aa6-45d0-b394-0172243f5c4c","Modelling Neighbourhood Effects in Three Dutch Cities Controlling for Selection","Troost, A.A. (TU Delft Urban Studies); van Ham, M. (TU Delft Urbanism; University of St Andrews); Janssen, H.J. (Max Planck Institute for the Study of Crime, Security and Law, Freiburg)","","2021","The non-random selection of people into neighbourhoods complicates the estimation of causal neighbourhood effects on individual outcomes. Measured neighbourhood effects could be the result of characteristics of the neighbourhood context, but they could also result from people selecting into neighbourhoods based on their preferences, income, and the availability of alternative housing. This paper examines how the neighbourhood effect on individual income is altered when geographic selection correction terms are added as controls, and how these results vary across three Dutch urban regions. We use a two-step approach in which we first model neighbourhood selection, and then include neighbourhood choice correction components in a model estimating neighbourhood effects on individual income. Using longitudinal register datasets for three major Dutch cities: Amsterdam, Utrecht and Rotterdam, and multilevel models, we analysed the effects for individuals who moved during a 5-year period. We show that in all cities, the effect of average neighbourhood income on individual income becomes much smaller after controlling for explicitly modelled neighbourhood selection. This suggests that studies that do not control for neighbourhood selection most likely overestimate the size of neighbourhood effects. For all models, the effects of neighbourhood income are strongest in Rotterdam, followed by Amsterdam and Utrecht.","Income; Neighbourhood effects; Neighbourhood selection; Selection bias; Social inequality","en","journal article","","","","","","","","","","Urbanism","Urban Studies","","",""
"uuid:43f037bf-ddc1-4de9-a8b0-569e31a58247","http://resolver.tudelft.nl/uuid:43f037bf-ddc1-4de9-a8b0-569e31a58247","Financial Incentives for Healthy Living for Patients with Cardiac Disease from the Perspective of Health Care Professionals: Interview Study","de Buisonjé, David (Universiteit Leiden); van der Geer, Jessica (Universiteit Leiden); Keesman, Mike (Universiteit Leiden); van der Vaart, Roos (Universiteit Leiden); Reijnders, T. (Universiteit Leiden); Wentzel, Jobke (University of Twente); Kemps, Hareld (Maxima Medical Center, Veldhoven); Kraaijenhagen, Roderik (Hearts4people Foundation); Janssen, Veronica (Universiteit Leiden; Leiden University Medical Center); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden; Erasmus Universiteit Rotterdam; Leiden University Medical Center)","","2021","Background: A promising new approach to support lifestyle changes in patients with cardiovascular disease (CVD) is the use of financial incentives. Although financial incentives have proven to be effective, their implementation remains controversial, and ethical objections have been raised. It is unknown whether health care professionals (HCPs) involved in CVD care find it acceptable to provide financial incentives to patients with CVD as support for lifestyle change. Objective: This study aims to investigate HCPs’ perspectives on using financial incentives to support healthy living for patients with CVD. More specifically, we aim to provide insight into attitudes toward using financial incentives as well as obstacles and facilitators of implementing financial incentives in current CVD care. Methods: A total of 16 semistructured, in-depth, face-to-face interviews were conducted with Dutch HCPs involved in supporting patients with CVD with lifestyle changes. The topics discussed were attitudes toward an incentive system, obstacles to using an incentive system, and possible solutions to facilitate the use of an incentive system. Results: HCPs perceived an incentive system for healthy living for patients with CVD as possibly effective and showed generally high acceptance. However, there were concerns related to focusing too much on the extrinsic aspects of lifestyle change, disengagement when rewards are insignificant, paternalization and threatening autonomy, and low digital literacy in the target group. According to HCPs, solutions to mitigate these concerns included emphasizing intrinsic aspects of healthy living while giving extrinsic rewards, integrating social aspects to increase engagement, supporting autonomy by allowing freedom of choice in rewards, and aiming for a target group that can work with the necessary technology. Conclusions: This study mapped perspectives of Dutch HCPs and showed that attitudes are predominantly positive, provided that contextual factors, design, and target groups are accurately considered. Concerns about digital literacy in the target group are novel findings that warrant further investigation. Follow-up research is needed to validate these insights among patients with CVD.","Cardiac rehabilitation; Cardiovascular disease; CVD; Financial incentives; Healthy lifestyle; Material rewards","en","journal article","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:49abf35c-8bec-4f87-b16c-aec16404953f","http://resolver.tudelft.nl/uuid:49abf35c-8bec-4f87-b16c-aec16404953f","Sturen op onvastheid: het dilemma van de inclusieve stad","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2021","Niet de fysieke functies, maar de manier waarop mensen gebruik maken van gebieden moet centraal komen staan in het debat over de sociaal duurzame stad. Céline Janssen legt op basis van haar promotieonderzoek uit wat dit betekent voor gebiedsontwikkeling. “Dit is ingewikkeld, maar wel een manier om verder te komen dan sociale duurzaamheid alleen in termen van fysieke leefbaarheid van een gebied te interpreteren.”","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:1b713961-4e6d-4bb5-a7d0-37279084ee57","http://resolver.tudelft.nl/uuid:1b713961-4e6d-4bb5-a7d0-37279084ee57","Rearranging Phylogenetic Networks","Janssen, R. (TU Delft Discrete Mathematics and Optimization)","Aardal, K.I. (promotor); van Iersel, L.J.J. (copromotor); Delft University of Technology (degree granting institution)","2021","","Graph theory; Mathematical biology; Phylogenetics; Rearrangement moves","en","doctoral thesis","","978-94-6332-758-9","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:334f0062-1fa3-421a-ae73-3dcd16c4f4c5","http://resolver.tudelft.nl/uuid:334f0062-1fa3-421a-ae73-3dcd16c4f4c5","Gimmick of geniaal: lukt dat, sociale duurzaamheid via de Community Land Trust?","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2021","Ze zijn er volop: mooie plannen die beogen een antwoord te geven op grote opgaven in gebiedsontwikkeling. Deze zomer leggen we de mooiste, grootste, meest gedurfde en utopische plannen langs de meetlat van de realiteit. In deel 4: de Community Land Trust, een soort mini-woningcorporatie voor mensen met een lager of middeninkomen die verbinding met de buurt zoeken. Promovendus Céline Janssen is positief: “Alle bijbehorende vragen en dilemma’s vormen absoluut geen reden om deze beloftevolle innovatie voorbij te laten gaan.”","","en","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:aea4549f-4708-4d61-a1ec-ef9be1a7f81c","http://resolver.tudelft.nl/uuid:aea4549f-4708-4d61-a1ec-ef9be1a7f81c","Assessing the Effectiveness of the IJmuiden Salt Screen Design for Nonuniform Selective Withdrawal by Physical and Numerical Modeling","De Fockert, Anton (Deltares); O'Mahoney, Tom S.D. (Deltares); Nogueira, Helena I.S. (Deltares); Oldenziel, G. (TU Delft Fluid Mechanics); Bijlsma, Arnout C. (Deltares); Janssen, Hans (Rijkswaterstaat)","","2022","Salt water intrusion through the New Sea Lock of IJmuiden, Netherlands requires mitigation to ensure availability of enough fresh water further inland. For this purpose, a salt screen has been proposed for selective withdrawal of salt water from the Noordzeekanaal in the vicinity of the lock complex. Formulas to assess the withdrawal rate of selective withdrawal are based on idealized layouts and conditions. In the case of IJmuiden, the flow surrounding a salt screen has a strong nonuniform character, such that these formulas are not applicable to predict the correct withdrawal rate and the effectiveness of selective withdrawal accurately. In this case physical scale modeling or computational fluid dynamics (CFD) modeling can be applied. This article discusses the limitations of the formulas for a three-dimensional (3D) flow application near the locks of IJmuiden and presents the use of CFD and physical scale model research to assess the flow patterns around the salt screen and the effectiveness of selective withdrawal. The CFD model was validated against the physical scale model and represented the complex flow fields around the salt screen to within acceptable deviations for both steady and transient states. This gives confidence in applying these more advanced modeling tools for the design and positioning of salt screens in confined complex 3D flow areas.","CFD validation; Density currents; Density measurements; New sea lock IJmuiden; Particle image velocimetry (PIV); Physical scale model; Salt intrusion; Salt screen; Selective withdrawal; Three-dimensional particle tracking velocimetry (3D-PTV)","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Fluid Mechanics","","",""
"uuid:6c36039e-cabb-4fb0-a83a-82417c3e8600","http://resolver.tudelft.nl/uuid:6c36039e-cabb-4fb0-a83a-82417c3e8600","Data-driven government: Cross-case comparison of data stewardship in data ecosystems","van Donge, W. (TU Delft Information and Communication Technology); Bharosa, Nitesh (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2022","Government agencies are becoming more data-driven and need high-quality data to fulfill their roles in society. In the past, each agency organized its own data exchange system according to its own needs. Today, data is distributed over many organizations, and government agencies need to adopt an ecosystem approach for data exchange. Fundamental in the ecosystem approach is the dependence on other parties for the execution of stewardship strategies. Data-driven government agencies increasingly depend on other organizations for high-quality data and data stewardship across organizations is becoming more critical. While there is ample research on data stewardship within organizations, little is known about data stewardship in ecosystems. More specifically, it is unclear which data stewardship strategies government agencies can employ in ecosystems. The main goal of this explorative paper is to identify and compare data stewardship strategies used in empirical government-business ecosystems. Following an explorative case study approach, this paper reveals three different configurations of inter-organizational data stewardship: 1) the government-led ecosystem, 2) the government-business-led ecosystem, and 3) the regulation-led ecosystem. The case studies expose a wide array of data stewardship strategies across ecosystems. While the ecosystem approach provides advantages such as cost-sharing and innovation by private parties, government agencies become increasingly dependent on private parties to gain high-quality data and provide distributed infrastructure components. Maximizing the benefits and minimizing the risks of the ecosystem approach requires government agencies to be cautious when selecting a specific ecosystem configuration.","Data exchange; Data stewardship; Digital transformation; Governance; Government-business data ecosystems; Information quality; Interdependence; System quality","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:25a78ad1-d1cb-4a77-a592-9daa8b8add47","http://resolver.tudelft.nl/uuid:25a78ad1-d1cb-4a77-a592-9daa8b8add47","Using Causal Discovery to Design Agent-based Models","Janssen, S.A.M. (TU Delft Air Transport & Operations); Sharpanskykh, Alexei (TU Delft Air Transport & Operations); Mohammadi Ziabari, S.S. (TU Delft Air Transport & Operations)","Van Dam, Koen H. (editor); Verstaevel, Nicolas (editor)","2022","Designing agent-based models is a difficult task. Some guidelines exist to aid modelers in designing their models, but they generally do not include specific details on how the behavior of agents can be defined. This paper therefore proposes the AbCDe methodology, which uses causal discovery algorithms to specify agent behavior. The methodology combines important expert insights with causal graphs generated by causal discovery algorithms based on real-world data. This causal graph represents the causal structure among agent-related variables, which is then translated to behavioral properties in the agent-based model. To demonstrate the AbCDe methodology, it is applied to a case study in the airport security domain. In this case study, we explore a new concept of operations, using a service lane, to improve the efficiency of the security checkpoint. Results show that the models generated with the AbCDe methodology have a closer resemblance with the validation data than a model defined by experts alone.","Causal Discovery; Airport Security; Agent-based Modelling","en","book chapter","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Air Transport & Operations","","",""
"uuid:b46fba9f-2f2e-46e0-8204-f6c689b1eaa7","http://resolver.tudelft.nl/uuid:b46fba9f-2f2e-46e0-8204-f6c689b1eaa7","A fuzzy-set qualitative comparative analysis of factors influencing successful shared service center implementation","Plugge, Albert (Nyenrode Business Universiteit); Nikou, Shahrokh (Åbo Akademi University; Stockholm University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2022","Purpose: Organizations nowadays require services supplied by shared service centers (SSCs) to achieve organizational responsiveness. Previous contributions focused on distinct qualitative-explorative factors for explaining successful SSC implementation but failed to consider the interdependencies and combined effects between factors. Design/methodology/approach: Drawing on complexity and configuration theories, this research employed a fuzzy-set qualitative comparative analysis (fsQCA). A unique dataset of 121 international firms was obtained to examine the combined effects of five conditions (factors), namely, modularization, standardization, decision-rights, portfolio and customer-orientation. Findings: The findings show that multiple configurations of conditions (or solutions) can lead to successful SSC implementation. The fsQCA results indicated that portfolio and standardization are perceived as core conditions in all configurations. Firms that focus on portfolio and continuous evaluation of customer-orientation are more likely to be successful. Furthermore, in some configurations, the size of the firm size matters. Research limitations/implications: The cross-sectional survey data might be a potential limitation. In future research, a more extensive survey can be collected to help generalize the results. Practical implications: Success factors are dependent on the SSC configuration. Standardization, portfolio management and regular evaluations of changing customer services by executive management are needed. Originality/value: To the best of the authors' knowledge, there is no academic study that examines SSC implementation based on salient conditions using a configurational thinking approach. As such, the findings of the research allow us to better understand the causal complexity and interdependencies between essential SSC factors.","Configurations; Fuzzy-set qualitative comparative analysis (fsQCA); Portfolio; Shared service center; Standardization","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-09-29","","","Information and Communication Technology","","",""
"uuid:9a1c09d7-5400-4577-81be-a1d0093a4aca","http://resolver.tudelft.nl/uuid:9a1c09d7-5400-4577-81be-a1d0093a4aca","Digital citizen empowerment: A systematic literature review of theories and development models","Sharma, Swapnil (Indian Institute of Technology Delhi); Kar, Arpan K. (Indian Institute of Technology Delhi); Gupta, M. P. (Indian Institute of Technology Delhi); Dwivedi, Yogesh K. (Swansea University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2022","Governments worldwide invest heavily in digital initiatives to develop information societies with connected and actively engaged citizens, but problems like lacking sustained engagement and quality of participation still plague them. We undertook a systematised literature review on the Scopus and Web of Science (WoS) databases, covering dispersed literature surrounding Digital Citizen Empowerment (DCE) from the past two decades.Categorising the literature under four thematic categories or strategies of DCE: Digital Activism (DA), Multi-channel Service Delivery (MCSD), Participatory Budgeting (PB), and Deliberative Governance (DG) critical comparative analysis is done. A conceptual model of DCE, covering how theories from different inter-disciplinary areas of political, social, and information science influence the development of information societies and DCE is presented. Action points in our conceptual model are mapped to policy objectives targeting improved delivery of empowering policy goals by practitioners, and future research opportunities in the context of DCE are discussed.","citizen empowerment; digital activism; Digital empowerment; digital society; e-Governance","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-09-02","","","Information and Communication Technology","","",""
"uuid:beddc7de-9bae-458a-b00a-f7b950cec4fb","http://resolver.tudelft.nl/uuid:beddc7de-9bae-458a-b00a-f7b950cec4fb","A terrestrial network positioning system: Better performance combing fiber optics and wideband radio","Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Dun, H. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems); Dierikx, Erik (Van Swinden Laboratorium (VSL)); Koelemeij, Jeroen (Vrije Universiteit Amsterdam); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning)","","2022","","","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:0742e42f-43cf-41c9-8b27-98d4fb1734e5","http://resolver.tudelft.nl/uuid:0742e42f-43cf-41c9-8b27-98d4fb1734e5","Connectedness of Unit Distance Subgraphs Induced by Closed Convex Sets","Janssen, R. (TU Delft Discrete Mathematics and Optimization); van Steijn, Leonie (Universiteit Leiden)","","2022","The unit distance graph G1Rd is the infinite graph whose nodes are points in Rd, with an edge between two points if the Euclidean distance between these points is 1. The 2-dimensional version G1R2 of this graph is typically studied for its chromatic number, as in the Hadwiger-Nelson problem. However, other properties of unit distance graphs are rarely studied. Here, we consider the restriction of G1Rd to closed convex subsets X of Rd. We show that the graph G1Rd[X] is connected precisely when the radius of r(X) of X is equal to 0, or when r(X) ≥ 1 and the affine dimension of X is at least 2. For hyperrectangles, we give bounds for the graph diameter in the critical case that the radius is exactly 1.","","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:52e2fb79-e3c7-4083-85c2-27add899cae1","http://resolver.tudelft.nl/uuid:52e2fb79-e3c7-4083-85c2-27add899cae1","Serious Games for Building Data Capacity","Di Staso, D. (TU Delft Design Conceptualization and Communication); Mulder, I. (TU Delft Design Conceptualization and Communication); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Kleiman, F. (NHL Stenden University of Applied Sciences)","","2022","Open data can support the creation of new services, facilitate research, and provide insights into everyday issues affecting citizens. Although public administrations are making efforts to create sustainable and inclusive open data systems, there is limited capacity to identify suitable datasets, clean, release, and reuse them. Serious games offer a possible solution for data capacity building and have already been used to train civil servants and citizens on the topic of open data. This research presents a review of serious games and discusses their potential for data capacity building. The games selected in the review are classified and described according to their different learning outcomes, formats, and type of media. Most serious games found in this review can be categorized as teaching games and are designed to raise data awareness, which is only a limited aspect of building data capacity. We found a lack of design games, research games, and policy games. Given their success for ideation in other fields, design games offer a particular opportunity to build data capacity by generating new ideas about how to reuse open datasets.","data capacity; open data; serious games","en","journal article","","","","","","","","","","","Design Conceptualization and Communication","","",""
"uuid:a5e1e3b4-0b93-43c3-b5bd-2d78526349e3","http://resolver.tudelft.nl/uuid:a5e1e3b4-0b93-43c3-b5bd-2d78526349e3","Level-2 networks from shortest and longest distances","Huber, Katharina T. (University of East Anglia); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Moulton, Vincent (University of East Anglia); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization)","","2022","Recently it was shown that a certain class of phylogenetic networks, called level-2 networks, cannot be reconstructed from their associated distance matrices. In this paper, we show that they can be reconstructed from their induced shortest and longest distance matrices. That is, if two level-2 networks induce the same shortest and longest distance matrices, then they must be isomorphic. We further show that level-2 networks are reconstructible from their shortest distance matrices if and only if they do not contain a subgraph from a family of graphs. A generator of a network is the graph obtained by deleting all pendant subtrees and suppressing degree-2 vertices. We also show that networks with a leaf on every generator side are reconstructible from their induced shortest distance matrix.","Distance matrix; Level-k network; Phylogenetic networks; Reconstructibility","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:3db92c93-f6c2-485a-9eb8-571ae7b12c1e","http://resolver.tudelft.nl/uuid:3db92c93-f6c2-485a-9eb8-571ae7b12c1e","Delay Estimation for Ranging and Localization Using Multiband Channel State Information","Kazaz, T. (TU Delft Signal Processing Systems); Janssen, G.J.M. (TU Delft Signal Processing Systems); Romme, J.P.A. (TU Delft Signal Processing Systems; Stichting IMEC Nederland); van der Veen, A.J. (TU Delft Signal Processing Systems)","","2022","In wireless networks, an essential step for precise range-based localization is the high-resolution estimation of multipath channel delays. The resolution of traditional delay estimation algorithms is inversely proportional to the bandwidth of the training signals used for channel probing. Considering that typical training signals have limited bandwidth, delay estimation using these algorithms often leads to poor localization performance. To mitigate these constraints, we exploit the multiband and carrier frequency switching capabilities of wireless transceivers and propose to acquire channel state information (CSI) in multiple bands spread over a large frequency aperture. The data model of the acquired measurements has a multiple shift-invariance structure, and we use this property to develop a high-resolution delay estimation algorithm. We derive the Cramér-Rao Bound (CRB) for the data model and perform numerical simulations of the algorithm using system parameters of the emerging IEEE 802.11be standard. Simulations show that the algorithm is asymptotically efficient and converges to the CRB. To validate modeling assumptions, we test the algorithm using channel measurements acquired in real indoor scenarios. From these results, it is seen that delays (ranges) estimated from multiband CSI with a total bandwidth of 320 MHz show an average RMSE of less than 0.3 ns (10 cm) in 90% of the cases.","Delay estimation; ranging; super resolution; subspace fitting; multiband CSI; IEEE 802.11be; WiFi-7; OFDM","en","journal article","","","","","","","","","","","Signal Processing Systems","","",""
"uuid:a64379f8-148b-4fc7-8ce6-308404c18a10","http://resolver.tudelft.nl/uuid:a64379f8-148b-4fc7-8ce6-308404c18a10","Editorial: How to develop a quality research article and avoid a journal desk rejection","Dwivedi, Yogesh K. (Swansea University; Bharati Vidyapeeth Deemed University); Hughes, Laurie (Swansea University); Cheung, Christy M.K. (Hong Kong Baptist University); Conboy, Kieran (National University of Ireland Galway); Duan, Yanqing (University of Bedfordshire Business School); Dubey, Rameshwar (Liverpool Business School); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Jones, Paul (Swansea University); Sigala, Marianna (University of Piraeus); Viglia, Giampaolo (University of Portsmouth; University of Aosta Valley)","","2022","The desk rejection of submitted articles can be a hugely frustrating and demotivating process from the perspective of the researcher, but equally, a time-consuming and vital step in the process for the Editor, tasked with selecting appropriate articles that meet the required criteria for further review and scrutiny. The feedback from journal Editors within this editorial, highlights the significant gaps in understanding from many academics of the journal assessment process and acceptance criteria for progression to the review stage. This editorial offers a valuable “lived-in” perspective on the desk rejection process through the lens of the Editor, via the differing views of nine leading journal Editors. Each Editor articulates their own perspectives on the many reasons for desk rejection, offering key insight to researchers on how to align their submissions to the specific journal requirements and required quality criteria, whilst demonstrating relevance and contribution to theory and practice. This editorial develops a succinct summary of the key findings from the differing Editor perspectives, offering a timely contribution of significant value and benefit to academics and industry researchers alike.","Article submission; Desk rejection; Journal review; Publishing","en","contribution to periodical","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-03-21","","","Information and Communication Technology","","",""
"uuid:d0c64d52-b7f9-4703-92e8-01614aea608b","http://resolver.tudelft.nl/uuid:d0c64d52-b7f9-4703-92e8-01614aea608b","Categorizing and relating implementation challenges for realizing blockchain applications in government","Luthra, Sunil (Ch. Ranbir Singh State Institute of Engineering and Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Rana, Nripendra P. (Qatar University); Yadav, Gunjan (Swarrnim Startup and Innovation University); Dwivedi, Yogesh K. (Swansea University; Bharati Vidyapeeth Deemed University)","","2022","Purpose: Blockchain technology (BCT) can be used for a wide variety of applications across domains and can bring many benefits. BCT-based applications can be beneficial for the government as well as businesses. Despite the many promises, BCT implementation lags behind. The purpose of this research is to identify a roadmap of critical implementation challenges that influence BCT implementation by governments. Design/methodology/approach: The study develops an ISM-based model spread across seven levels to analyze the inter-relationship among the selected BCT challenges. The MICMAC analysis further helps in evaluating the variables based on their driving power and dependencies. Findings: The findings show that all challenges have a strong impact on implementing BCT. The foundation for implementation BCT is to define standards and develop appropriate regulations. Next, the findings show the need for a shared infrastructure meeting the basic technical and societal requirements and developing viable business models to advance BCT implementation. Many challenges hinder the development of blockchain applications meeting the technical and ethical requirements. Originality/value: Existing research has analyzed the relationship among challenges. To the best of the authors' knowledge this is the first paper to collate these implementation challenges and incorporate them to develop a hierarchical model using interpretive structural modeling technique. The results can be used to prioritize the tackling of the challenges.","Blockchain; Blockchain technology; Challenges; Implementation; Interpretive structural modeling; MICMAC analysis","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-01-14","","","Information and Communication Technology","","",""
"uuid:3055d17f-b61b-4634-897e-066ac6e4a3c5","http://resolver.tudelft.nl/uuid:3055d17f-b61b-4634-897e-066ac6e4a3c5","Metaverse beyond the hype: Multidisciplinary perspectives on emerging challenges, opportunities, and agenda for research, practice and policy","Dwivedi, Yogesh K. (Symbiosis Institute of Business Management, Pune); Hughes, Laurie; Baabdullah, Abdullah M. (King Abdulaziz University); Ribeiro-Navarrete, Samuel (ESIC Business & Marketing School); Giannakis, Mihalis (Audencia); Al-Debei, Mutaz M. (Al-Ahliyya Amman University; The University of Jordan); Dennehy, Denis; Metri, Bhimaraya (Indian Institute of Management Nagpur); Buhalis, Dimitrios (Bournemouth University Business School UK and Visiting Professor); Cheung, Christy M.K. (Hong Kong Baptist University); Conboy, Kieran (National University of Ireland Galway); Doyle, Ronan (Lero – The Irish Software Research Centre & National University of Ireland); Dubey, Rameshwar (Montpellier Research in Management; Liverpool Business School); Dutot, Vincent (IPAG Business School,); Felix, Reto (University of Texas Rio Grande Valley); Goyal, D. P. (Indian Institute of Management Shillong); Gustafsson, Anders (BI Norwegian Business School); Hinsch, Chris (Grand Valley State University); Jebabli, Ikram (Université Internationale de Rabat); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Kim, Young Gab (Sejong University); Kim, Jooyoung (University of Georgia); Koos, Stefan (University of the Federal Armed Forces Munich); Kreps, David (NUI Galway); Kshetri, Nir (Bryan School of Business and Economics); Kumar, Vikram (Student TU Delft); Ooi, Keng Boon (UCSI University; Chang Jung Christian University; Nanchang Institute of Technology); Papagiannidis, Savvas (Newcastle University); Pappas, Ilias O. (University of Agder; Norwegian University of Science and Technology (NTNU)); Polyviou, Ariana (University of Nicosia); Park, Sang Min (Korea University); Pandey, Neeraj (National Institute of Industrial Engineering); Queiroz, Maciel M. (FGV EAESP); Raman, Ramakrishnan (Symbiosis Institute of Business Management, Pune); Rauschnabel, Philipp A. (University of the Federal Armed Forces Munich); Shirish, Anuragini (Université Paris-Saclay); Sigala, Marianna (University of Piraeus; Curtin University); Spanaki, Konstantina (Audencia); Wei-Han Tan, Garry (UCSI University; Nanchang Institute of Technology); Tiwari, Manoj Kumar (National Institute of Industrial Engineering; Indian Institute of Technology Kharagpur); Viglia, Giampaolo (University of Portsmouth; University of Aosta Valley); Wamba, Samuel Fosso (TBS Business School)","","2022","The metaverse has the potential to extend the physical world using augmented and virtual reality technologies allowing users to seamlessly interact within real and simulated environments using avatars and holograms. Virtual environments and immersive games (such as, Second Life, Fortnite, Roblox and VRChat) have been described as antecedents of the metaverse and offer some insight to the potential socio-economic impact of a fully functional persistent cross platform metaverse. Separating the hype and “meta…” rebranding from current reality is difficult, as “big tech” paints a picture of the transformative nature of the metaverse and how it will positively impact people in their work, leisure, and social interaction. The potential impact on the way we conduct business, interact with brands and others, and develop shared experiences is likely to be transformational as the distinct lines between physical and digital are likely to be somewhat blurred from current perceptions. However, although the technology and infrastructure does not yet exist to allow the development of new immersive virtual worlds at scale - one that our avatars could transcend across platforms, researchers are increasingly examining the transformative impact of the metaverse. Impacted sectors include marketing, education, healthcare as well as societal effects relating to social interaction factors from widespread adoption, and issues relating to trust, privacy, bias, disinformation, application of law as well as psychological aspects linked to addiction and impact on vulnerable people. This study examines these topics in detail by combining the informed narrative and multi-perspective approach from experts with varied disciplinary backgrounds on many aspects of the metaverse and its transformational impact. The paper concludes by proposing a future research agenda that is valuable for researchers, professionals and policy makers alike.","Augmented reality; Avatars; Extended reality; Metaverse; Second life; Virtual reality; Virtual world","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:9886ff9f-00cd-4b33-a61a-7ec10fbfd6f0","http://resolver.tudelft.nl/uuid:9886ff9f-00cd-4b33-a61a-7ec10fbfd6f0","From requirements to a research agenda for governments governing reuse of critical raw materials in the circular economy","van Engelenburg, S.H. (TU Delft Information and Communication Technology); Rukanova, B.D. (TU Delft Information and Communication Technology); Ubacht, J. (TU Delft Information and Communication Technology); Tan, F.S. (Circular Symbiosis); Tan, Y. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Hagen, Loni (editor); Solvak, Mihkel (editor); Hwang, Sungsoo (editor)","2022","Governmental organisations use a diversity of policy instruments for sustainability goals. In the field of materials, they aim to advance the reuse of materials on the one hand. On the other hand, they also want to control critical raw materials (CRMs) to protect society against scarcity. Information sharing is required to monitor for both objectives. Research into information sharing for the circular economy mainly focuses on using ICT to follow entire products, such as digital product passports. However, research into information sharing for reuse flows and monitoring at the level of materials is limited so far. Therefore, in this paper, we derive the following requirements for information sharing to support the monitoring of materials and CRMs in particular: 1) businesses and government organisations should have access to the complete history of materials; 2) businesses should be able to share information on materials between different supply chains and industries; 3) information on materials should be reliable and tamper-resistant; 4) governments should be able to obtain a complete overview of the pool of CRMs in circulation and of who is responsible for them; 5) the system supporting the information sharing on materials should be highly robust and should not have a single locus of control. Based on this overview of requirements, we present a research agenda in which we identify challenges and related future research questions.","Circular Economy; Interorganisational Information Systems; Business-to-Government Information Sharing; Critical Raw Materials","en","conference paper","Digital Government Society","","","","","","","","","","Information and Communication Technology","","",""
"uuid:f12f0cf1-3500-4411-a9cf-f0df94ad468a","http://resolver.tudelft.nl/uuid:f12f0cf1-3500-4411-a9cf-f0df94ad468a","WebAndTheCity'22: 8th International Workshop on The Web and Smart Cities","Anthopoulos, Leonidas (University of Thessaly); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Weerakkody, Vishanth (Bradford University)","","2022","This is the 8th edition of the workshop series labeled ""AW4City - Web Applications and Smart Cities"", which started back in Florence in 2015 and kept on taking place every year in conjunction with the WWW conference series. Last year the workshop was held virtually in Ljubljana, Slovenia. The workshop series aims to investigate the Web and Web applications' role in establishing smart city (SC) promises. The workshop series aim to investigate the role of the Web and of Web applications in SC growth. This year, the workshop focuses on the role of the web in smart environment. In the era of cities and under the UN 2030 Agenda and the European Green deal for sustainable growth, cities appear to play crucial role in securing humanity against environmental threats and generate sustainable and circular cities. In this regard, cities attempt to improve their forms (e.g., more compact, and eco-friendlier) and performance to become friendlier and able to host their increasing populations. Additionally, new types of business appear (e.g., that utilize IoT and data, manage e-waste and recycle), while the co-existence of autonomous things and people generate another challenge that cities have been started phasing. This workshop aims to demonstrate how web applications, Apps and Web Intelligence can serve smart environment in general.","smart citizens; smart city; smart environment; web Apps","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Information and Communication Technology","","",""
"uuid:9ff6c0fc-a512-42fe-b93d-b06f324f08c2","http://resolver.tudelft.nl/uuid:9ff6c0fc-a512-42fe-b93d-b06f324f08c2","How do Non-profit Open data Intermediaries enhance Open data Usability?: A Systematic Literature Review","Pilshchikova, L. (TU Delft Information and Communication Technology); Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","Non-profit organisations (NPOs) are one type of open data intermediaries connecting different actors in the open data ecosystem. They perform a number of activities, from requesting the government to open up the data to application development. Such activities can have an effect on open data usability barriers that other actors in the open data ecosystem encounter. The objective of this study is to systematically review the literature on the influence of NPOs' activities on the usability barriers for open data users in the open data ecosystem. The authors identified and analysed fourteen relevant papers. This study shows that NPOs conduct various activities that relate to different intermediary roles in the open data ecosystem, which in turn can affect certain usability barriers. Moreover, NPOs may perform different activities depending on the type of open data they work with. However, the connection between the activities and open data usability barriers for open data users cannot be clearly established from the selected articles, as most of them do not focus on establishing such a link. This review highlights a literature gap in relation to NPOs' activities and their effects on open data usability.","intermediaries; non-profit organisations; open data; usability","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-03-14","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:e21b07c3-df73-4469-a057-7f58270d3acb","http://resolver.tudelft.nl/uuid:e21b07c3-df73-4469-a057-7f58270d3acb","Challenges in the Transition towards a Quantum-safe Government","Kong, I. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Bharosa, Nitesh (TU Delft Information and Communication Technology)","Hagen, Loni (editor); Solvak, Mihkel (editor); Hwang, Sungsoo (editor)","2022","The computation power of quantum computers introduces new security threats in Public Key Infrastructure (PKI), a system used by many governments to secure their digital public services and communication. This calls for an inevitable need for governments to be quantum-safe (QS) by modifying their PKI systems to be resistant to the attacks of quantum computers. However, there is limited academic literature on a QS PKI system, and in this limited literature, the transition challenges are perceived as exclusively technological. This paper aims to create a structured overview of challenges when transitioning to a QS PKI system. We do this by reviewing literature and classifying the challenges using Technology-Organization-Environment (TOE) framework and using an expert workshop to explore the challenges in the context of the PKI system in the Dutch government. The main challenges in the technological context include no universal QS solution, legacy system, complex PKI interoperability, and vulnerable Root CA. The main challenges in the organizational context include knowledge gap, unclear governance, lack of urgency, and in-house management support. Furthermore, the main challenges in the environmental context include institutional void, stakeholder collaboration, lack of awareness, and policy guidance. The results indicate that the QS transition from the current PKI system is complex, and the challenges are socio-Technical. For policy-makers, this implies that they should start early to prepare, whereas organizations are hardly aware of the process of QS transition and the topic of quantum computing is yet to develop the urgency in organizations.","Quantum-Safe Governmen; Post Quantum Cryptography; Pub- lic organization; Public Key Infrastructure transition challenges; Systematic","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:ba1e7d9c-98ab-48a1-9a30-bbcf3d93096f","http://resolver.tudelft.nl/uuid:ba1e7d9c-98ab-48a1-9a30-bbcf3d93096f","Creating Trust in Citizen Participation through Decentralized Autonomous Citizen Participation Organizations (DACPOs)","Rikken, O.K. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Roosenboom-Kwee, Z. (TU Delft Economics of Technology and Innovation)","Hagen, Loni (editor); Solvak, Mihkel (editor); Hwang, Sungsoo (editor)","2022","Blockchain-based Decentralized Autonomous Organizations (DAOs) are systems for transacting and storing value by automatically executing a function without the need for trusted, centralized authorities. Participative budgeting requires voting about budget allocation by communities and is often confronted with issues in trust and transparency. Yet, DAOs are hardly used for participative budgeting. In this research, we introduce Decentralized Autonomous Citizen Participation Organizations (DACPOs). In a DACPO, data and actions are recorded and autonomously executed in a decentralized way. DACPOs can be used for enabling participative budgeting and thereby provide transparency, decrease the risks of fraud and corruption, and increase citizens' trust. The viability of DACPOs depends on a number of factors, including a minimum number of citizens who participate. In further research, factors influencing the use of DACPOs for participative budgeting can be further analyzed and tested.","Blockchain; Decentralized autonomous citizen participation organization (DACPO); Decentralized autonomous organization (DAO); Participative budgeting; Token smart contract","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-03-14","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:043a221e-6e49-4cd1-b282-851d268ad2df","http://resolver.tudelft.nl/uuid:043a221e-6e49-4cd1-b282-851d268ad2df","Public Values of Trustworthy Peer-To-peer (P2P) Lending System","Sulastri, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Hagen, Loni (editor); Solvak, Mihkel (editor); Hwang, Sungsoo (editor)","2022","Governments want to improve the economy by extending the market of financial credit. Recently, Peer-To-peer (P2P) lending credit scoring systems have gained more attention for advancing society; however, the role of governments in ensuring fair access to such a system is not known. This work aims to understand better the public values for trustworthy P2P lending systems. Public values should provide the basis to which a P2P lending system should adhere. Credit scoring in P2P lending is not merely about the technology in creating a profitable system for all participants. Several public values are of relevance. Understanding credit scoring in P2P lending is crucial to ensure inclusiveness, trustworthiness, fairness, equal treatment, and accountability.","Credit scoring; P2P lending; Public values; Trustworthy AI","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-03-14","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:e95dd53c-0f60-4c8a-a6b2-fa0cfb442d53","http://resolver.tudelft.nl/uuid:e95dd53c-0f60-4c8a-a6b2-fa0cfb442d53","Shaping the Future of Shared Services Centers: Insights from a Delphi Study About SSC Transformation Towards 2030","Ferreira, Cicero (University of Liverpool); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","In recent years, shared services centers (SSCs) have been central to organizational transformation strategies of many large firms and governments to reduce costs, improve service quality, and innovate services. SSCs are undergoing significant transformations due to the advancement of technologies. To better understand the technologies’ impact on SSCs in 2030, a Delphi panel with over 30 experts, executives, and researchers was conducted in the first half of 2020. Panelists pointed out six recent technologies potentially impacting SSCs by 2030: AI/ML, internet/package-based automation, BPMS/RPA, business analytics, blockchain, and cloud computing. The experts expect that these technologies will cause a transformation in the SSC business model and disruptive changes in SSC employees’ and managers’ profiles. Managers cannot merely continue their regular efforts and should refocus from automating repetitive functions towards intensifying the use of technology in value-adding services. The outcomes should help public and private sector managers to be ahead of change and prepare their organizations for the future of SSCs.","Delphi; Digital transformation; Disruption by technologies; Dynamic capability; Foresight; Organizational transformation; Shared service centers; Shared services; Systems theory","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:2aed8c7e-88bb-4d10-a40f-797ee6c702cc","http://resolver.tudelft.nl/uuid:2aed8c7e-88bb-4d10-a40f-797ee6c702cc","Shoulder muscle activity after latissimus dorsi transfer in an active elevation","Gurnani, Navin (Vrije Universiteit Amsterdam); van Deurzen, Derek F.P. (Onze Lieve Vrouwe Gasthuis); Willems, W. Jaap (DC Expert Centre, Amsterdam); Janssen, Thomas W.J. (Vrije Universiteit Amsterdam); Veeger, H.E.J. (TU Delft Biomechanical Engineering)","","2022","Background: After latissimus dorsi transfer (LDT), an increase in scapulothoracic (ST) contribution in thoracohumeral (TH) elevation is observed when compared to the asymptomatic shoulder. It is not known which shoulder muscles contribute to this change in shoulder kinematics, and whether the timing of muscle recruitment has altered after LDT. The aim of the study was to identify which shoulder muscles and what timing of muscle recruitment are responsible for the increased ST contribution and shoulder elevation after LDT for a massive irreparable posterosuperior rotator cuff tear (MIRT). Methods: Thirteen patients with a preoperative pseudoparalysis and MIRT were recruited after LDT with a minimum follow-up of 1 year. Three-dimensional electromagnetic tracking was used to assess maximum active elevation of the shoulder (MAES) in both the LDT and the asymptomatic contralateral shoulder (ACS). Surface electromyography (EMG) tracked activation (% EMG max) and activation timing of the latissimus dorsi (LD), deltoid, teres major, trapezius (upper, middle and lower) and serratus anterior muscles were collected. MAES was studied in forward flexion, scapular abduction and abduction in the coronal plane. Results: In MAES, no difference in thoracohumeral motion was observed between the LDT and ACS, P = .300. However, the glenohumeral motion for MAES was significantly lower in LDT shoulders F(1,12) = 11.230, P = .006. The LD % EMG max did not differ between the LDT and ACS in MAES. A higher % EMG max was found for the deltoid F(1,12) = 17.241, P = .001, and upper trapezius F(1,10) = 13.612, P = .004 in the LDT shoulder during MAES. The middle trapezius only showed a higher significant difference in % EMG max for scapular abduction, P = .020 (LDT, 52.3 ± 19.4; ACS, 38.1 ± 19.7).The % EMG max of the lower trapezius, serratus anterior and teres major did not show any difference in all movement types between the LDT and ACS and no difference in timing of recruitment of all the shoulder muscles was observed. Conclusions: After LDT in patients with a MIRT and preoperative pseudoparalysis, the LD muscle did not alter its % EMG max during MAES when compared to the ACS. The cranial transfer of the LD tendon with its native %EMG max, together with the increased %EMG max of the deltoid, middle and upper trapezius muscles could be responsible for the increased ST contribution. The increased glenohumeral joint reaction force could in turn increase active elevation after LDT in a previous pseudoparalytic shoulder.","Basic Science Study; Electromyography; Kinesiology; Latissimus dorsi; Massive rotator cuff tear; Muscle transfer; Shoulder surgery","en","journal article","","","","","","","","","","Biomechanical Engineering","","","",""
"uuid:386bceb5-271b-48b9-8049-9450ca1091b4","http://resolver.tudelft.nl/uuid:386bceb5-271b-48b9-8049-9450ca1091b4","Changer le comportement des agents publics face à l’ouverture des données publiques: évaluation de l’effet d’un jeu par comparaison des intentions avant et après l’intervention","Kleiman, F. (TU Delft Transport and Logistics; TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Meijer, Sebastiaan (KTH Royal Institute of Technology)","","2022","Les administrations adoptent de plus en plus des politiques d’ouverture des données. Toutefois, les agents publics jugent difficile de respecter ces nouvelles politiques. Les jeux peuvent les aider à pratiquer l’ouverture des données et à modifier leur comportement en faveur d’une plus grande ouverture. Dans cet article, nous évaluons l’effet d’un jeu dans le cadre d’une expérimentation qui compare, avant et après l’intervention, plusieurs facteurs ayant une incidence sur l’ouverture des données. Les bénéfices observés sont inattendus à plusieurs égards. Le jeu a permis de partager des connaissances dans les domaines de la gestion, de la confidentialité et de la sécurité des données, de modifier de manière significative les bénéfices perçus, et de faire évoluer de manière positive l’intention de comportement.
Remarques à l’intention des praticiens
Le comportement des agents publics a une incidence sur la façon dont les politiques publiques sont mises en œuvre. Pour beaucoup, la diffusion de données publiques par les administrations est fondamentale pour accroître la transparence publique et la participation des citoyens, et pour ouvrir de nouvelles perspectives économiques. Les jeux peuvent influer sur l’attitude des agents publics, et donc modifier les décisions des administrations. Transmettre des connaissances et fournir des enseignements tirés de nouvelles expériences peut influencer l’attitude des agents publics à l’égard des données ouvertes. Les administrations peuvent également utiliser les jeux à cette fin.","","fr","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","Engineering, Systems and Services","Transport and Logistics","","",""
"uuid:7a4ed802-82ec-4536-956d-6723a49cef52","http://resolver.tudelft.nl/uuid:7a4ed802-82ec-4536-956d-6723a49cef52","A Systematic Literature Review on the Use of Games for Attitude Change: Searching for Factors Influencing Civil Servants' Attitudes","Kleiman, F. (TU Delft Transport and Logistics; TU Delft Information and Communication Technology); Meijer, Sebastiaan (KTH Royal Institute of Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","Governments are increasingly using games for civic engagement, decision making, and education. Serious gaming is a type of game that has often been advocated as a means for changing the attitude of its players and can be used for changing the attitude of civil servants. However, the relationship between games and attitude change in civil servants remains unexplored. This paper aims at identifying factors leading to attitude change of civil servants. As hardly any paper is focused on civil servants' attitude change through games, the authors broaden their research to attitude change through games in general. Out of 483 documents, 19 reference papers were analyzed in detail. Eighty-one games were found, and more than 13 different theories were identified containing 30 different influencing factors, which were found mostly to be unrelated and context-dependent. The conceptual dispersion between studies indicates that the resulting overview of factors is a first step towards creating a uniform theory. The results can help governments to design better games.","","en","book chapter","IGI Global","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","Engineering, Systems and Services","Transport and Logistics","","",""
"uuid:13def59c-4dad-42e8-9e3c-959b0156bee0","http://resolver.tudelft.nl/uuid:13def59c-4dad-42e8-9e3c-959b0156bee0","Imaging the CarbFix2 Reinjection Reservoir at Hellisheiði, Iceland, with Body-wave Seismic Interferometry","Hassing, S.H.W. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Barnhoorn, A. (TU Delft Applied Geophysics and Petrophysics); Janssen, M. (Student TU Delft)","","2022","In July 2021, passive seismic data has been recorded on a network of geophones at the CarbFix2 injection site at Hellisheiði, Iceland. This data is processed using seismic interferometry to get an image of the injection reservoir. The data is split up into noise panels. Panels dominated by body-wave energy are selected using an illumination analysis. In panels where the dominant event has a (near) vertical incidence, each trace is autocorrelated to get a zero-offset section. In panels where the dominant event is recognized as a body-wave event, all the traces are crosscorrelated, obtaining virtual common-shot gathers. This is processed with a reflection-seismology workflow to obtain a stacked section. Comparing the two final sections shows that similar reflectors are imaged. The zero-offset section shows a higher frequency content, while the stacked section shows more continuous reflectors. Comparison with a local geological model shows that the results are plausible, but that a better interpretation has to wait for more results of the same survey to be processed.","","en","conference paper","EAGE","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Applied Geophysics and Petrophysics","","",""
"uuid:4f8c7a16-f566-49ea-8e1b-1a3d79b38a80","http://resolver.tudelft.nl/uuid:4f8c7a16-f566-49ea-8e1b-1a3d79b38a80","Business Model Canvas for Big and Open Linked Data in Smart and Circular Cities: Findings From Europe","Anthopoulos, Leonidas (University of Thessaly); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","This article introduces a business model for big and open linked data in smart and circular cities, laying the foundation of a new approach that generates societal, business, and public value.","","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","Engineering, Systems and Services","","","",""
"uuid:799dd815-ed98-4b83-8750-f73d4aefad8b","http://resolver.tudelft.nl/uuid:799dd815-ed98-4b83-8750-f73d4aefad8b","The elements of the Peer-to-peer (P2P) lending system: A Systematic Literature Review","Sulastri, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Amaral, Luis (editor); Soares, Delfina (editor); Zheng, Lei (editor)","2022","Peer-to-peer (P2P) lending systems have gained governments' attention to create an inclusive society, but establishing such systems remain challenging. Specifically, the elements making up such a system are not known. This research aims to understand the main elements of P2P lending systems and their interconnections. For this, we conducted a Systematic Literature Review to investigate the elements that build the complex arrangement of the P2P lending system. Our review identified five categories of elements that build an integral part of the P2P lending system: Data and Processing, Business, Organizational, Policy and Governance, and Culture. Although technical aspects have gained much attention, social aspects need to be considered carefully. We conclude that P2P lending systems are context-dependent. Moreover, the interaction and the combination of each element influence the whole design of the system. These elements can assist the government in designing a socially accepted P2P lending system that contributes to an inclusive society.","Credit Scoring; Financial inclusion; Inclusive society; P2P lending system","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:636f540a-996e-4fdf-8b27-b2b8160380d7","http://resolver.tudelft.nl/uuid:636f540a-996e-4fdf-8b27-b2b8160380d7","Monitoring Co2 Injection into Basaltic Reservoir Formations at the HellisheiÐi Geothermal Site in Iceland: Laboratory Experiments","Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Bos, Jordan (Seismic Mechatronics BV); Farina, B. (Istituto Nazionale di Oceanografia e Geofisica Sperimentale); Barnhoorn, A. (TU Delft Applied Geophysics and Petrophysics); Poletto, F. (Istituto Nazionale di Oceanografia e Geofisica Sperimentale); Van Otten, G. (Seismic Mechatronics BV); Wolf, K.H.A.A. (TU Delft Applied Geophysics and Petrophysics); Durucan, S. (Imperial College London)","","2022","In the ACT Consortium funded project SUCCEED, researchers study the potential for monitoring the process of (re-)injecting produced and captured CO2 into the Hellisheiði geothermal field for the aid of enhancing geothermal deployment as well as permanently storing CO2 through mineralization. The Hellisheiði site provides an excellent opportunity for demonstrating an innovative seismic monitoring technique. Prior to conducting an active-source monitoring survey, we perform acoustic transmission measurements, on Hellisheiði rock samples, at field-representative stress conditions to obtain the seismic-response characteristics of all present formations. Subsequently, we use the acquired velocity data as an input for simulating 2D seismic surveys using a subsurface model representing the Hellisheiði site. Results show that the impact of increasing depth, i.e., stress, on seismic velocities is most apparent for the porous basalt layers due to their relatively large portion of open pore space, allowing for substantial compaction, increasing their bulk density and thus velocity. The poorly-consolidated hyaloclastites reveal a negligible effect of increasing depth on their velocity as the material already reached its maximum compaction at low stresses, thus at shallow depths. Comparison of synthetic and field geophone data reveal that the velocity profiles have to be updated for the shallow depths in the model.","","en","conference paper","European Association of Geoscientists & Engineers","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Applied Geophysics and Petrophysics","","",""
"uuid:a1e221f6-c5eb-4d8a-9aa5-ccdf6e67ac3c","http://resolver.tudelft.nl/uuid:a1e221f6-c5eb-4d8a-9aa5-ccdf6e67ac3c","""I needed to solve their overwhelmness"": How system administration work was affected by COVID-19","Kaur, M. (TU Delft Information and Communication Technology); Parkin, S.E. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Fiebig, T. (TU Delft Information and Communication Technology)","","2022","The ongoing global COVID-19 pandemic made working from home – wherever working remotely is possible the norm for what had previously been office-based jobs across the world. This change in how we work created a challenging situation for system administrators (sysadmins), as they are the ones building and maintaining the digital infrastructure our world relies on. In this paper, we examine how system administration work changed early in the pandemic from sysadmins’ personal perspectives, through semi-structured interviews and thematic analysis. We find that sysadmins faced a two-sided crisis: While sysadmins’ own work environment changed, they also had to react to the new situation and facilitate stable options to work online for themselves and their colleagues, supporting their users in adapting to the crisis. This finding embeds into earlier work on the connection between IT (security) work and the notion of ‘care’, where we substantiate these earlier findings with results from a repeatable method grounded in coordination theory. Furthermore, while we find that sysadmins perceived no major changes in the way they work, by consecutively probing our interviewees, we find that they did experience several counter-intuitive effects on their work. This includes that while day-to-day communication became inherently more difficult, other tasks were streamlined by the remote working format and were seen as having become easier. Finally, by structuring our results according to a model of coordination and communication, we identify changes in sysadmins’ coordination patterns. From these we derive recommendations for how system administration work can be coordinated, ranging beyond the immediate pandemic response and the transition to any ‘new normal’ way of working.","Human Factors; system administration; Qualitative study; sysadmin; COVID-19; Interviews; system operations; sysops","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:e9b07f55-7f05-4808-9826-620aca45d240","http://resolver.tudelft.nl/uuid:e9b07f55-7f05-4808-9826-620aca45d240","Strategies to advance the dream of integrated digital public service delivery in inter-organizational collaboration networks","Wouters, Stijn (Katholieke Universiteit Leuven); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Lember, Veiko (Katholieke Universiteit Leuven; Tallinn University of Technology); Crompvoets, Joep (Katholieke Universiteit Leuven)","","2022","Public administrations are increasingly relying on collaboration within inter-organizational networks to coordinate the development and provisioning of integrated digital public services. Collaboration strategies are necessary to focus collaborative efforts, align and prioritize goals, and leverage concrete results that advance integrated service delivery (ISD). However, literature on inter-organizational collaboration strategies for integrated service delivery is scarce. This research identifies collaboration strategies in three qualitative case studies in Belgium. The cases present 33 collaboration strategies categorized into engagement, motivation, and joint action strategies. Collaboration strategies should complement each other. Together these strategies can help to overcome the adoption paradox, one of the key issues to advance ISD, which refers to service providers not being inclined to adopt an ISD unless it has many users, but users might not be willing to use and ISD before many service providers have adopted it. Policy-makers can use the identified collaboration strategies to advance integrated service delivery.","Adoption paradox; Collaboration strategies; E-government; Integrated service delivery; Inter-organizational collaboration","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:f0aa105f-a864-4253-adb8-d47a81a23b8a","http://resolver.tudelft.nl/uuid:f0aa105f-a864-4253-adb8-d47a81a23b8a","Unraveling the Social-Technical Complexity of Dashboards for Transformation","Lemke, Florian (Capgemini); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology); Draheim, Dirk (Tallinn University of Technology)","Chugunov, Andrei V. (editor); Janssen, Marijn (editor); Khodachek, Igor (editor); Misnikov, Yuri (editor); Trutnev, Dmitrii (editor)","2022","The need for standardized and visualized performance monitoring on a wide range of topics has become apparent in recent years. In the public sector, there has been an increase in the number of dashboards to create transparency into the progress. Yet, the design of dashboards encounters many challenges ranging from technical to social. The goal of this research is to unravel the social-technical complexity of dashboards and outline their basic requirements and a process for creating dashboards. In addition to explicit project milestones, these also visualize digital implementation programs at the policy level.","Complexity; Dashboard; Design Dimensions; Digital Government; e-Government (eGov); Performance Monitoring; Stakeholder","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-10-14","","","Information and Communication Technology","","",""
"uuid:4747010a-5f4a-4072-8294-93fb736ac4cf","http://resolver.tudelft.nl/uuid:4747010a-5f4a-4072-8294-93fb736ac4cf","Adaptive Governance for a Resilient Digital Society","Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Chugunov, Andrei V. (editor); Janssen, Marijn (editor); Khodachek, Igor (editor); Misnikov, Yuri (editor); Trutnev, Dmitrii (editor)","2022","Governments are confronted with all kinds of changes in their digital environment, such as pandemics, fake news, and security breaches. These changes come with many uncertainties and are hard to predict, whereas decisions need to be made quickly to avoid a negative impact. Adaptive governance embraces uncertainty and complexity by enabling continuous learning, involving a wide range of diverse actors, and being able to react within a short time frame. Adaptive governance can be viewed as a governance philosophy based on a range of instruments to create adaptability. The conflicting values of stability and adaptability can be balanced in different ways by governments. The variety in the environment and the variety of instrument to adapt to the environment needs to be in concert. Adaptive governance instruments can be combined to increase their effectiveness and to create a resilient society. Further research in governance instruments, their usage, and their effectiveness is needed.","Adaptability; Adaptive governance; Agility; Cybersecurity; Information society; Law of requisite variety","en","conference paper","Springer Nature","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-10-14","","","Information and Communication Technology","","",""
"uuid:29f658ec-ef3c-470a-a71c-4871b84d98fc","http://resolver.tudelft.nl/uuid:29f658ec-ef3c-470a-a71c-4871b84d98fc","Towards a Common Definition of Open Data Intermediaries","Shaharudin, Ashraf (TU Delft Urban Data Science); van Loenen, B. (TU Delft Urban Data Science); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","The role of open data intermediaries is considered instrumental in the supply and use of open data. There are various definitions of open data intermediaries in the literature and some of them are quite different from each other. These definitions
can benefit from harmonization so knowledge about open data intermediaries can be developed on top of a shared understanding of what open data intermediaries mean. The objective of this article is to propose a common definition of open data intermediaries. We first carried out a systematic literature review and compiled the definitions of open data intermediaries from the literature. We found that each definition can be broken down into four basic components: (i) Who are the actors of open data intermediaries? (ii) What do they do? (iii) Where are they located in the open data lifecycle? and (iv) Why are they needed? We then conducted another round of data gathering and analysis to substantiate the four basic components. We proposed the following common definition of open data intermediaries: Third-party actors who provide specialized resources
and capabilities to (i) enhance the supply, flow, and/or use of open data and/or (ii) strengthen the relationships among various open data stakeholders.","Open data; intermediaries; infomediaries; definition","en","journal article","","","","","","","","","","Engineering, Systems and Services","Urban Data Science","","",""
"uuid:f7449814-0ad5-4067-90a7-36367e825a0e","http://resolver.tudelft.nl/uuid:f7449814-0ad5-4067-90a7-36367e825a0e","Lifestyle support preferences of patients with cardiovascular diseases: What lifestyle support might work best for whom?","Cohen Rodrigues, Talia R. (Universiteit Leiden); Reijnders, T. (TU Delft Design Aesthetics; Universiteit Leiden); de Buisonjé, D.R. (Universiteit Leiden); Breeman, Linda D. (Universiteit Leiden); van den Broek, Inge (Harteraad); Janssen, Veronica R. (Universiteit Leiden; Leiden University Medical Center); Kraaijenhagen, Roderik A. (NDDO Institute for Prevention and Early Diagnostics (NIPED), Amsterdam; Vital10, Amsterdam); Atsma, D.E. (Leiden University Medical Center); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden; Leiden University Medical Center; Erasmus Universiteit Rotterdam)","","2022","Background: Lifestyle support is essential in preventing and treating cardiovascular diseases (CVD), and eHealth may be an easy and affordable solution to provide this support. However, CVD patients vary in their ability and interest to use eHealth. This study investigates demographic characteristics determining CVD patients' online and offline lifestyle support preferences. Methods: We used a cross-sectional study design. 659 CVD patients (Harteraad panel) completed our questionnaire. We assessed demographic characteristics and preferred lifestyle support type (coach, eHealth, family/friends, self-supportive). Results: Respondents mostly preferred being self-supportive (n = 179, 27.2%), and a coach in a group or individually (n = 145, 22.0%; n = 139, 21.1%). An app/internet to work independently (n = 89, 13.5%) or being in touch with other CVD patients (n = 44, 6.7%) was least preferred. Men were more likely to prefer being supported by family/friends (p = .016) or self-supportive (p < .001), while women preferred a coach individually or via an app/internet (p < .001). Older patients mostly preferred self-support (p = .001). Patients with low social support were more likely to prefer being coached individually (p < .001), but not support from family/friends (p = .002). Conclusion: Men and older patients are more interested in being self-supportive, and patients with lower levels of social support could need extra support outside their social network. eHealth could provide a solution, but attention should be paid to spike interest for digital interventions among certain groups.","Cardiovascular diseases; Cardiac care; Patient perspectives; Lifestyle; eHealth; Digital health; Self-management","en","journal article","","","","","","","","","","","Design Aesthetics","","",""
"uuid:70d7196c-d49f-4753-974b-765b60387b5c","http://resolver.tudelft.nl/uuid:70d7196c-d49f-4753-974b-765b60387b5c","Toward a Reference Architecture for User-Oriented Open Government Data Portals","Luthfi, A. (TU Delft Information and Communication Technology; Universitas Islam Indonesia); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","Shishkov, Boris (editor)","2022","Governments have established Open Government Data Portals (OGDP) to open various types of datasets that can be used to increase transparency, accountability, and innovation. OGDP is becoming a strategic program for citizen engagement and empowering users. Nevertheless, many OGDP architectures focus merely on publishing data and do not support the actual data use. Therefore, this paper aims to develop a reference architecture (RA) that takes a broader set of requirements aimed at enabling the use of open data into account. The RA consists of recommended structures and integrations of the end-to-end user interactions and services. In this research, we use the DKAN open data management platform as the basis to design a full suite of cataloguing and visualising the end-to-end user interactions. Five layers are proposed providing functionalities for using data. Whereas most portals are focused on releasing data, our RA is focused on empowering users by providing functionalities for the use of data.","DKAN; End-user; Open data; Portal; Reference architecture","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-01-31","","","Information and Communication Technology","","",""
"uuid:91002474-1ad9-4aa2-8dc3-cb67bbbd5ae1","http://resolver.tudelft.nl/uuid:91002474-1ad9-4aa2-8dc3-cb67bbbd5ae1","Are good intentions enough?: Evaluating social sustainability in urban development projects through the capability approach","Janssen, C. (TU Delft Practice Chair Urban Area Development); Basta, Claudia (PBL Netherlands Environmental Assessment Agency; Universiteit Utrecht)","","2022","Social sustainability is a multidimensional concept sensitive to the contexts of its application. This study explores how it is interpreted and applied in urban planning practices in which general social sustainability goals are translated into specific urban design interventions. Building upon Sen’s Capability Approach (CA), we analyse the gap between the operationalization of social sustainability goals in Urban Development Projects (UDPs) from the perspective of urban planners, and the following experiences of the residents in the developed urban areas. By applying a capability-based evaluative framework to a UDP in Amsterdam, the study reveals that residents value distinct urban functionings and experience different enabling factors related to urban social sustainability. We conclude that the CA provides an operationalizable framework for assessing how social sustainability goals defined at the early stage of UDPs translate in the actual capabilities of the urban residents for whom those very goals were conceived.","Social sustainability; Urban development projects; Capability approach operationalisation; Evaluative framework; Amsterdam","en","journal article","","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:58c7e5fa-fa25-4db1-a50d-183b0ed22e9d","http://resolver.tudelft.nl/uuid:58c7e5fa-fa25-4db1-a50d-183b0ed22e9d","Preface","Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Csáki, Csaba (Corvinus University of Budapest, Budapest); Lindgren, Ida (Linköping University); Loukis, Euripidis (University of the Aegean); Melin, Ulf (Linköping University); Pereira, Gabriela Viale (Danube University Krems); Bolívar, Manuel Pedro Rodríguez (Universidad de Granada); Tambouris, Efthimios (University of Macedonia)","","2022","","","en","contribution to periodical","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:d35771d6-7c93-406c-b703-26779f594796","http://resolver.tudelft.nl/uuid:d35771d6-7c93-406c-b703-26779f594796","Cooperating for added value: Using participatory game theory in implementing nature-based flood defences","Vreugdenhil, H.S.I. (TU Delft Policy Analysis; Deltares); Janssen, Stephanie (Deltares); Hermans, L.M. (TU Delft Policy Analysis; IHE Delft Institute for Water Education); Slinger, J (TU Delft Policy Analysis; Rhodes University)","","2022","The increasingly active role of stakeholders in the development of innovative nature-based solutions calls for appropriate instruments to support and realise added value from their involvement. In this paper we apply a newly developed instrument “Cooperation for Added Value” (Co-Add) to a study area on the Dutch coast. The instrument draws on participatory game theory and policy analysis to provide a theoretically sound structure for facilitating interactions aimed at identifying shared opportunities and potential coalitions for cooperation. The application in the case study Noard-Fryslân Bûtendyks affirmed that the Co-Add instrument systematically facilitated stakeholders in exploring potentially promising opportunities and gaining insight in the added value of engaging in diverse cooperations. Stakeholders came to understand which solutions were more achievable than others and what was needed to enable implementation in terms of collaboration, including the role of their own organization. Furthermore, social dilemmas in which a particular nature-based solution is attractive to a coalition of stakeholders but is not the most beneficial solution for a particular individual stakeholder, became clear. This represents a practical contribution to the range of participatory instruments that can be applied in societally challenging complex problems that require collaboration for their resolution.","Coalitions; Nature-based solutions; Participatory game theory; Policy analysis; Social dilemma; Wadden sea","en","journal article","","","","","","","","","","","Policy Analysis","","",""
"uuid:70e72477-d616-4b6f-a275-f16df603453b","http://resolver.tudelft.nl/uuid:70e72477-d616-4b6f-a275-f16df603453b","A Practical Fixed-Parameter Algorithm for Constructing Tree-Child Networks from Multiple Binary Trees","van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization); Zeh, Norbert (Dalhousie University)","","2022","We present the first fixed-parameter algorithm for constructing a tree-child phylogenetic network that displays an arbitrary number of binary input trees and has the minimum number of reticulations among all such networks. The algorithm uses the recently introduced framework of cherry picking sequences and runs in O((8 k) kpoly (n, t)) time, where n is the number of leaves of every tree, t is the number of trees, and k is the reticulation number of the constructed network. Moreover, we provide an efficient parallel implementation of the algorithm and show that it can deal with up to 100 input trees on a standard desktop computer, thereby providing a major improvement over previous phylogenetic network construction methods.","Fixed-parameter algorithms; Hybridization number; Phylogenetic networks","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-08-31","","","Discrete Mathematics and Optimization","","",""
"uuid:d9f04450-fef1-4ceb-9267-19ce4b62a0fb","http://resolver.tudelft.nl/uuid:d9f04450-fef1-4ceb-9267-19ce4b62a0fb","Teneurin4 dimer structures reveal a calcium-stabilized compact conformation supporting homomeric trans-interactions","Meijer, D.H.M. (TU Delft BN/Dimphna Meijer Lab; Kavli institute of nanoscience Delft; Universiteit Utrecht); Pereira Frias, C.S. (TU Delft BN/Dimphna Meijer Lab; Kavli institute of nanoscience Delft); Beugelink, J. Wouter (Universiteit Utrecht); Deurloo, Y.N. (TU Delft BN/Dimphna Meijer Lab; Kavli institute of nanoscience Delft); Janssen, Bert J.C. (Universiteit Utrecht)","","2022","Establishment of correct synaptic connections is a crucial step during neural circuitry formation. The Teneurin family of neuronal transmembrane proteins promotes cell–cell adhesion via homophilic and heterophilic interactions, and is required for synaptic partner matching in the visual and hippocampal systems in vertebrates. It remains unclear how individual Teneurins form macromolecular cis- and trans-synaptic protein complexes. Here, we present a 2.7 Å cryo-EM structure of the dimeric ectodomain of human Teneurin4. The structure reveals a compact conformation of the dimer, stabilized by interactions mediated by the C-rich, YD-shell, and ABD domains. A 1.5 Å crystal structure of the C-rich domain shows three conserved calcium binding sites, and thermal unfolding assays and SAXS-based rigid-body modeling demonstrate that the compactness and stability of Teneurin4 dimers are calcium-dependent. Teneurin4 dimers form a more extended conformation in conditions that lack calcium. Cellular assays reveal that the compact cis-dimer is compatible with homomeric trans-interactions. Together, these findings support a role for teneurins as a scaffold for macromolecular complex assembly and the establishment of cis- and trans-synaptic interactions to construct functional neuronal circuits.","","en","journal article","","","","","","","","","","","BN/Dimphna Meijer Lab","","",""
"uuid:11826f05-e8e6-4458-b877-3ba032db94a4","http://resolver.tudelft.nl/uuid:11826f05-e8e6-4458-b877-3ba032db94a4","Validation and optimization of the ATMO-Street air quality model chain by means of a large-scale citizen-science dataset","Hooyberghs, H. (Flemish Institute for Technological Research); De Craemer, S. (Flemish Institute for Technological Research; Universiteit Antwerpen); Lefebvre, W. (Flemish Institute for Technological Research); Vranckx, S. (Flemish Institute for Technological Research); Maiheu, B. (Flemish Institute for Technological Research); Trimpeneers, E. (VMM Vlaamse Milieumaatschappij; Belgian Interregional Environment Agency); Vanpoucke, C. (VMM Vlaamse Milieumaatschappij; Belgian Interregional Environment Agency); Janssen, S. (Flemish Institute for Technological Research); Meysman, F.J.R. (TU Delft BT/Environmental Biotechnology; Universiteit Antwerpen); Fierens, F. (VMM Vlaamse Milieumaatschappij; Belgian Interregional Environment Agency)","","2022","Detailed validation of air quality models is essential, but remains challenging, due to a lack of suitable high-resolution measurement datasets. This is particularly true for pollutants with short-scale spatial variations, such as nitrogen dioxide (NO2). While street-level air quality model chains can predict concentration gradients at high spatial resolution, measurement campaigns lack the coverage and spatial density required to validate these gradients. Citizen science offers a tool to collect large-scale datasets, but it remains unclear to what extent such data can truly increase model performance. Here we use the passive sampler dataset collected within the large-scale citizen science campaign CurieuzeNeuzen to assess the integrated ATMO-Street street-level air quality model chain. The extensiveness of the dataset (20.000 sampling locations across the densely populated region Flanders, ∼1.5 data points per km2) allowed an in-depth model validation and optimization. We illustrate generic techniques and methods to assess and improve street-level air quality models, and show that considerable model improvement can be achieved, in particular with respect to the correct representation of the small-scale spatial variability of the NO2-concentrations. After model optimization, the model skill of the ATMO-Street chain significantly increased, passing the FAIRMODE model quality threshold, and thus substantiating its suitability for policy support. More generally, our results reveal how a “deep validation” based on extensive spatial data can substantially improve model performance, thus demonstrating how air quality modelling can benefit from one-off large-scale monitoring campaigns.","Air pollution; Citizen science; Dispersion modelling; FAIRMODE Model Quality Objective; Model optimization; Model validation; Semi-variogram analysis; Spatial variation; Street level modelling","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","BT/Environmental Biotechnology","","",""
"uuid:0f6a066c-9652-4b87-95fa-a30cc9775128","http://resolver.tudelft.nl/uuid:0f6a066c-9652-4b87-95fa-a30cc9775128","The perils and pitfalls of explainable AI: Strategies for explaining algorithmic decision-making","de Bruijn, J.A. (TU Delft Organisation & Governance); Warnier, Martijn (TU Delft Multi Actor Systems); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2022","Governments look at explainable artificial intelligence's (XAI) potential to tackle the criticisms of the opaqueness of algorithmic decision-making with AI. Although XAI is appealing as a solution for automated decisions, the wicked nature of the challenges governments face complicates the use of XAI. Wickedness means that the facts that define a problem are ambiguous and that there is no consensus on the normative criteria for solving this problem. In such a situation, the use of algorithms can result in distrust. Whereas there is much research advancing XAI technology, the focus of this paper is on strategies for explainability. Three illustrative cases are used to show that explainable, data-driven decisions are often not perceived as objective by the public. The context might raise strong incentives to contest and distrust the explanation of AI, and as a consequence, fierce resistance from society is encountered. To overcome the inherent problems of XAI, decisions-specific strategies are proposed to lead to societal acceptance of AI-based decisions. We suggest strategies to embrace explainable decisions and processes, co-create decisions with societal actors, move away from an instrumental to an institutional approach, use competing and value-sensitive algorithms, and mobilize the tacit knowledge of professionals","Accountability; Algorithms; Artificial intelligence; Computational intelligence; Data-driven decision; E-government; Socio-tech; Transparency; Trust; XAI","en","journal article","","","","","","","","","","Multi Actor Systems","Organisation & Governance","","",""
"uuid:d859d502-3c74-4c48-8d60-d7d52edfc0ca","http://resolver.tudelft.nl/uuid:d859d502-3c74-4c48-8d60-d7d52edfc0ca","The Open Data Canvas-Analyzing Value Creation from Open Data","Gao, Y. (TU Delft Information and Communication Technology; Huazhong University of Science and Technology); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2022","Expectations to derive value from open data are high. However, how value is created from open data is still largely unknown. Open data value is usually generated in constellation of actors in which each player has different capabilities and roles. To understand the open data value creation process, the business model canvas is introduced in this article. The typical components of the business model canvas and open data value creation are derived from the literature. By combining these two research streams, the open data value model canvas is created. The case of Coronavirus disease 2019 (COVID-19) worldwide dashboard developed by the Johns Hopkins University is used to evaluate the model's utility. Key components of the open data value model are creating an overview of various data sources from public and private organizations, having capabilities to combine heterogeneous data, and connecting data and needs. In this way, the open data canvas helps to grasp the value creation logic.","business model canvas; data infomediaries; design science research; Open data; open data canvas; value creation","en","journal article","","","","","","","","","","","Information and Communication Technology","","",""
"uuid:438db919-e9a0-41e3-9f4c-a8f6f9dfc08b","http://resolver.tudelft.nl/uuid:438db919-e9a0-41e3-9f4c-a8f6f9dfc08b","Dismantling Digital Cages: Examining Design Practices for Public Algorithmic Systems","Nouws, S.J.J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Dobbe, R.I.J. (TU Delft Information and Communication Technology)","Janssen, Marijn (editor); Csáki, Csaba (editor); Lindgren, Ida (editor); Melin, Ulf (editor); Loukis, Euripidis (editor); Viale Pereira, Gabriela (editor); Rodríguez Bolívar, Manuel Pedro (editor); Tambouris, Efthimios (editor)","2022","Algorithmic systems used in public administration can create or reinforce digital cages. A digital cage refers to algorithmic systems or information architectures that create their own reality through formalization, frequently resulting in incorrect automated decisions with severe impact on citizens. Although much research has identified how algorithmic artefacts can contribute to digital cages and their unintended consequences, the emergence of digital cages from human actions and institutions is poorly understood. Embracing a broader lens on how technology, human activity, and institutions shape each other, this paper explores what design practices in public organizations can result in the emergence of digital cages. Using Orlikowski’s structurational model of technology, we found four design practices in observations and interviews conducted at a consortium of public organizations. This study shows that design processes of public algorithmic systems (1) are often narrowly focused on technical artefacts, (2) disregard the normative basis for these systems, (3) depend on involved actors’ awareness of socio-technics in public algorithmic systems, (4) and are approached as linear rather than iterative. These four practices indicate that institutions and human actions in design processes can contribute to the emergence of digital cages, but also that institutional – opposed to technical – possibilities to address their unintended consequences are often ignored. Further research is needed to examine how design processes in public organizations can evolve into socio-technical processes, can become more democratic, and how power asymmetries in the design process can be mitigated.","Design process; Digital cage; Public algorithmic system; Structuration","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-04-30","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:bc54fa39-9b9b-46c2-9697-1bec6cab2277","http://resolver.tudelft.nl/uuid:bc54fa39-9b9b-46c2-9697-1bec6cab2277","The Barriers and Facilitators of eHealth-Based Lifestyle Intervention Programs for People With a Low Socioeconomic Status: Scoping Review","Al-Dhahir, Isra (Universiteit Leiden); Reijnders, Thomas (Universiteit Leiden); Faber, J.S. (TU Delft Design Aesthetics); van den Berg-Emons, Rita J. (Erasmus MC); Janssen, Veronica R. (Universiteit Leiden; Leiden University Medical Center); Kraaijenhagen, Roderik A. (Vital10, Amsterdam; NDDO Institute for Prevention and Early Diagnostics (NIPED), Amsterdam); Visch, V.T. (TU Delft Design Aesthetics); Chavannes, N.H. (Leiden University Medical Center); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden)","","2022","Promoting health behaviors and preventing chronic diseases through a healthy lifestyle among those with a low socioeconomic status (SES) remain major challenges. eHealth interventions are a promising approach to change unhealthy behaviors in this target group. Objective: This review aims to identify key components, barriers, and facilitators in the development, reach, use, evaluation, and implementation of eHealth lifestyle interventions for people with a low SES. This review provides an overview for researchers and eHealth developers, and can assist in the development of eHealth interventions for people with a low SES. Methods: We performed a scoping review based on Arksey and O'Malley's framework. A systematic search was conducted on PubMed, MEDLINE (Ovid), Embase, Web of Science, and the Cochrane Library, using terms related to a combination of the following key constructs: eHealth, lifestyle, low SES, development, reach, use, evaluation, and implementation. There were no restrictions on the date of publication for articles retrieved upon searching the databases. Results: The search identified 1323 studies, of which 42 met our inclusion criteria. An update of the search led to the inclusion of 17 additional studies. eHealth lifestyle interventions for people with a low SES were often delivered via internet-based methods (eg, websites, email, Facebook, and smartphone apps) and offline methods, such as texting. A minority of the interventions combined eHealth lifestyle interventions with face-to-face or telephone coaching, or wearables (blended care). We identified the use of different behavioral components (eg, social support) and technological components (eg, multimedia) in eHealth lifestyle interventions. Facilitators in the development included iterative design, working with different disciplines, and resonating intervention content with users. Facilitators for intervention reach were use of a personal approach and social network, reminders, and self-monitoring. Nevertheless, barriers, such as technological challenges for developers and limited financial resources, may hinder intervention development. Furthermore, passive recruitment was a barrier to intervention reach. Technical difficulties and the use of self-monitoring devices were common barriers for users of eHealth interventions. Only limited data on barriers and facilitators for intervention implementation and evaluation were available. Conclusions: While we found large variations among studies regarding key intervention components, and barriers and facilitators, certain factors may be beneficial in building and using eHealth interventions and reaching people with a low SES. Barriers and facilitators offer promising elements that eHealth developers can use as a toolbox to connect eHealth with low SES individuals. Our findings suggest that one-size-fits-all eHealth interventions may be less suitable for people with a low SES. Future research should investigate how to customize eHealth lifestyle interventions to meet the needs of different low SES groups, and should identify the components that enhance their reach, use, and effectiveness.","barriers; eHealth; facilitators; health behaviors; intervention development; intervention evaluation; lifestyle interventions; low socioeconomic status; prevention","en","review","","","","","","","","","","","Design Aesthetics","","",""
"uuid:f06a04ed-1422-4c6f-96d9-0793f59c0343","http://resolver.tudelft.nl/uuid:f06a04ed-1422-4c6f-96d9-0793f59c0343","Neighbourhood histories and educational attainment: The role of accumulation, duration, timing and sequencing of exposure to poverty","Troost, A.A. (TU Delft Urban Studies); Janssen, H.J. (TU Delft Urban Studies); van Ham, M. (TU Delft Urbanism)","","2022","Studies of neighbourhood effects increasingly research the neighbourhood histories of individuals. It is difficult to compare the outcomes of these studies as they all use different datasets, conceptualisations and operationalisations of neighbourhood characteristics and outcome variables. This paper contributes to the literature by studying educational attainment and comparing the effects of the timing, accumulation, duration and sequencing of exposure to neighbourhood poverty. We use longitudinal register data to study the population of children born in the Netherlands in 1995 and follow them until the age of 23. Our findings show that it is important to separate the early adult years (age 18–22) when constructing individual histories of exposure to neighbourhood poverty. We find that the effect of exposure to neighbourhood deprivation on educational attainment during adolescence is slightly stronger than the effect of exposure during childhood. We conclude that the observed relationship between neighbourhood poverty and educational attainment depends on how exposure to the neighbourhood effect is conceptualised and measured; choosing just one dimension could lead to under- or overestimation of the importance of exposure to neighbourhood poverty.","education; inequality; neighbourhood; neighbourhood histories; poverty/exclusion","en","journal article","","","","","","","","","","Urbanism","Urban Studies","","",""
"uuid:754f3db7-131d-4fcf-918f-2b0d38b67659","http://resolver.tudelft.nl/uuid:754f3db7-131d-4fcf-918f-2b0d38b67659","Impact of different climatic conditions on peak core temperature of elite athletes during exercise in the heat: a Thermo Tokyo simulation study","Teunissen, L.P.J. (TU Delft Emerging Materials); Jansen, K.M.B. (TU Delft Emerging Materials); Janssen, E.S. (Student TU Delft); Kingma, Boris R.M. (TNO); De Korte, Johannus Q. (Radboud University Medical Center); Eijsvogels, Thijs M.H. (Radboud University Medical Center)","","2022","Objectives To evaluate how separate and combined climatic parameters affect peak core temperature during exercise in the heat using computer simulations fed with individual data. Methods The impact of eight environmental conditions on rectal temperature (T re) was determined for exercise under heat stress using the Fiala-thermal-Physiology-and-Comfort simulation model. Variations in ambient temperature (T a ±6°C), relative humidity (RH±15%) and solar radiation (SR+921 W/m 2) were assessed in isolation and combination (worst-case/best-case scenarios) and compared with baseline (T a 32°C, RH 75%, SR 0 W/m 2). The simulation model was fed with personal, anthropometric and individual exercise characteristics. Results 54 athletes exercised for 46±10 min at baseline conditions and achieved a peak core temperature of 38.9±0.5°C. Simulations at a higher T a (38°C) and SR (921 W/m 2) resulted in a higher peak T re compared with baseline (+0.6±0.3°C and +0.5±0.2°C, respectively), whereas a higher RH (90%) hardly affected peak T re (+0.1±0.1°C). A lower T a (26°C) and RH (60%) reduced peak T re by-0.4±0.2°C and a minor-0.1±0.1°C, respectively. The worst-case simulation yielded a 1.5±0.4°C higher T re than baseline and 2.0±0.7°C higher than the best-case condition. Conclusion Combined unfavourable climatic conditions produce a greater increase in peak core temperature than the sum of its parts in elite athletes exercising in the heat.","Athlete; Heat stress; Olympics; Thermoregulation","en","journal article","","","","","","","","","","","Emerging Materials","","",""
"uuid:e4377a81-d730-4f6a-bda8-bbc733ab116d","http://resolver.tudelft.nl/uuid:e4377a81-d730-4f6a-bda8-bbc733ab116d","Why Organizations Fail in Implementing Enterprise Architecture Initiatives?","Gong, Y. (TU Delft Information and Communication Technology; Wuhan University); Janssen, M.F.W.H.A. (TU Delft Information and Communication Technology)","","2022","Enterprise architecture (EA) initiatives consist of functions, processes, tools, instruments, and principles to guide the design of IT and its alignment with business. EA is often presented as a silver bullet to ensure that IT contributes to business. Yet, many EA initiatives do not work out or even fail, but in the literature this area is undertheorized. This study aims to understand the factors influencing the failure of EA initiatives. We identified 15 factors and invited 8 EA experts to evaluate the factors and their influence based on an approach combining grey systems theory, Decision-Making and Trial Evaluation Laboratory (DEMATEL), and Interpretative Structural Modeling (ISM). The findings indicate that the factors are correlated and interwoven in complex causal chains. This study reveals the root factor and suggests enhancing high-level managers’ EA knowledge and ensuring communication and leadership skills of enterprise architects as the starting point to avoid EA failure. Only later, organizing the EA function becomes important.","DEMATEL; Enterprise Architecture; Grey systems theory; ISM; IT architecture; IT failure","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-12-09","","","Information and Communication Technology","","",""
"uuid:8d64371d-431d-431a-a64d-a404b84ddcc7","http://resolver.tudelft.nl/uuid:8d64371d-431d-431a-a64d-a404b84ddcc7","Orchard Networks are Trees with Additional Horizontal Arcs","van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization)","","2022","Phylogenetic networks are used in biology to represent evolutionary histories. The class of orchard phylogenetic networks was recently introduced for their computational benefits, without any biological justification. Here, we show that orchard networks can be interpreted as trees with additional horizontal arcs. Therefore, they are closely related to tree-based networks, where the difference is that in tree-based networks the additional arcs do not need to be horizontal. Then, we use this new characterization to show that the space of orchard networks on n leaves with k reticulations is connected under the rNNI rearrangement move with diameter O(kn+ nlog (n)).","Connectedness; Orchard networks; Phylogenetic networks; Rearrangement moves","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:08c942fb-aab7-4b19-8948-e3129d005d0c","http://resolver.tudelft.nl/uuid:08c942fb-aab7-4b19-8948-e3129d005d0c","Shoulder kinematics and muscle activity following latissimus dorsi transfer for massive irreparable posterosuperior rotator cuff tears in shoulders with pseudoparalysis","Gurnani, Navin (Spaarne Gasthuis, Hoofddorp); Willems, W. Jaap (DC Expert Centre, Amsterdam); van Deurzen, Derek F.P. (DC Expert Centre, Amsterdam); Weening, Alexander A. (Diakonessehuis Utrecht); Bouwer, Joran (Vrije Universiteit Amsterdam); Janssen, Thomas W.J. (Vrije Universiteit Amsterdam); Veeger, H.E.J. (TU Delft Biomechanical Engineering)","","2022","Background: The aim of this study was to evaluate the thoracohumeral (TH) and glenohumeral (GH) motion with muscle activity after latissimus dorsi transfer (LDT) in a shoulder with a massive irreparable posterosuperior rotator cuff tear (MIRT) and pseudoparalysis compared with the asymptomatic contralateral shoulder (ACS). Methods: We recruited and evaluated 13 patients after LDT in a shoulder with preoperative clinical pseudoparalysis and an MIRT on magnetic resonance imaging, with a minimum follow-up period of 1 year, and with a Hamada stage of 3 or less. Three-dimensional electromagnetic tracking was used to assess shoulder active range of motion in both the LDT shoulder and the ACS. The maximal active elevation of the shoulder (MAES) was assessed and consisted of forward flexion, scapular abduction, and abduction in the coronal plane. Maximal active internal rotation and external rotation were assessed separately. Surface electromyography (EMG) was performed to track activation of the latissimus dorsi (LD) and deltoid muscles during shoulder motion. EMG was scaled to its maximal isometric voluntary contraction recorded in specified strength tests. Results: In MAES, TH motion of the LDT shoulder was not significantly different from that of the ACS (F1,12 = 1.174, P = .300) but the GH contribution was significantly lower in the LDT shoulder for all motions (F1,12 = 11.230, P = .006). External rotation was significantly greater in the ACS (26° ± 10° in LDT shoulder vs. 42° ± 11° in ACS, P < .001). The LD percentage EMG maximum showed no significant difference between the LDT shoulder and ACS during MAES (F1,11 = 0.005, P = .946). During maximal active external rotation of the shoulder, the LDT shoulder showed a higher percentage EMG maximum than the ACS (3.0% ± 2.9% for LDT shoulder vs. 1.2% ± 2.0% for ACS, P = .006). Conclusions: TH motion improved after LDT in an MIRT with pseudoparalysis and was not different from the ACS except for external rotation. However, GH motion was significantly lower after LDT than in the ACS in active-elevation range of motion. The LD was active after LDT but not more than in the ACS except for active external rotation, which we did not consider relevant as the activity did not rise above 3% EMG maximum. The favorable clinical results of LDT do not seem to be related to a change in LD activation and might be explained by its effect in preventing proximal migration of the humeral head in active elevation.","Basic Science Study; electromyography; Kinesiology; Latissimus dorsi; massive rotator cuff tear; muscle transfer; shoulder kinematics; shoulder surgery","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","Biomechanical Engineering","","","",""
"uuid:dae43c5b-554a-4daf-b8b9-7a84956ba9a6","http://resolver.tudelft.nl/uuid:dae43c5b-554a-4daf-b8b9-7a84956ba9a6","The science case and challenges of space-borne sub-millimeter interferometry","Gurvits, L. (TU Delft Astrodynamics & Space Missions; Joint Institute for VLBI ERIC); Falcke, Heino (Astrophysics and Particle PhysicsRadboud University); Frey, Sándor (Konkoly Observatory Hungarian Academy of Sciences; Eötvös University); Fromm, Christian M. (Goethe University); García-Miró, Cristina (Ign); Janssen, Michael (Max-Planck-Institute for Radio Astronomy); Masania, K. (TU Delft Aerospace Manufacturing Technologies); Rajan, R.T. (TU Delft Signal Processing Systems); Visser, P.N.A.M. (TU Delft Space Engineering)","","2022","Ultra-high angular resolution in astronomy has always been an important vehicle for making fundamental discoveries. Recent results in direct imaging of the vicinity of the supermassive black hole in the nucleus of the radio galaxy M87 by the millimeter VLBI system Event Horizon Telescope and various pioneering results of the Space VLBI mission RadioAstron provided new momentum in high angular resolution astrophysics. In both mentioned cases, the angular resolution reached the values of about 10–20 microarcseconds (0.05–0.1 nanoradian). Further developments towards at least an order of magnitude “sharper” values, at the level of 1 microarcsecond are dictated by the needs of advanced astrophysical studies. The paper emphasis that these higher values can only be achieved by placing millimeter and submillimeter wavelength interferometric systems in space. A concept of such the system, called Terahertz Exploration and Zooming-in for Astrophysics, has been proposed in the framework of the ESA Call for White Papers for the Voyage 2050 long term plan in 2019. In the current paper we present new science objectives for such the concept based on recent results in studies of active galactic nuclei and supermassive black holes. We also discuss several approaches for addressing technological challenges of creating a millimeter/sub-millimeter wavelength interferometric system in space. In particular, we consider a novel configuration of a space-borne millimeter/sub-millimeter antenna which might resolve several bottlenecks in creating large precise mechanical structures. The paper also presents an overview of prospective space-qualified technologies of low-noise analogue front-end instrumentation for millimeter/sub-millimeter telescopes. Data handling and processing instrumentation is another key technological component of a sub-millimeter Space VLBI system. Requirements and possible implementation options for this instrumentation are described as an extrapolation of the current state-of-the-art Earth-based VLBI data transport and processing instrumentation. The paper also briefly discusses approaches to the interferometric baseline state vector determination and synchronisation and heterodyning system. The technology-oriented sections of the paper do not aim at presenting a complete set of technological solutions for sub-millimeter (terahertz) space-borne interferometers. Rather, in combination with the original ESA Voyage 2050 White Paper, it sharpens the case for the next generation microarcsecond-level imaging instruments and provides starting points for further in-depth technology trade-off studies.","Millimeter and sub-millimeter astronomy; Radio interferometry; Space-borne astrophysics; VLBI","en","journal article","","","","","","","","","","Space Engineering","Astrodynamics & Space Missions","","",""
"uuid:4b4113a2-6dda-407d-b3a6-64665154273e","http://resolver.tudelft.nl/uuid:4b4113a2-6dda-407d-b3a6-64665154273e","A hybrid optical–wireless network for decimetre-level terrestrial positioning","Koelemeij, Jeroen C.J. (Vrije Universiteit Amsterdam); Dun, H. (TU Delft Mathematical Geodesy and Positioning); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Dierikx, Erik F. (VSL Dutch Metrology Institute); Janssen, G.J.M. (TU Delft Signal Processing Systems); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning)","","2022","Global navigation satellite systems (GNSS) are widely used for navigation and time distribution1–3, features that are indispensable for critical infrastructure such as mobile communication networks, as well as emerging technologies such as automated driving and sustainable energy grids3,4. Although GNSS can provide centimetre-level precision, GNSS receivers are prone to many-metre errors owing to multipath propagation and an obstructed view of the sky, which occur particularly in urban areas where accurate positioning is most needed1,5,6. Moreover, the vulnerabilities of GNSS, combined with the lack of a back-up system, pose a severe risk to GNSS-dependent technologies7. Here we demonstrate a terrestrial positioning system that is independent of GNSS and offers superior performance through a constellation of radio transmitters, connected and time-synchronized at the subnanosecond level through a fibre-optic Ethernet network8. Using optical and wireless transmission schemes similar to those encountered in mobile communication networks, and exploiting spectrally efficient virtual wideband signals, the detrimental effects of multipath propagation are mitigated9, thus enabling robust decimetre-level positioning and subnanosecond timing in a multipath-prone outdoor environment. This work provides a glimpse of a future in which telecommunication networks provide not only connectivity but also GNSS-independent timing and positioning services with unprecedented accuracy and reliability.","","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Mathematical Geodesy and Positioning","","",""
"uuid:c79c8fd0-d828-45cb-b153-0f6e4b3b4f29","http://resolver.tudelft.nl/uuid:c79c8fd0-d828-45cb-b153-0f6e4b3b4f29","Structural insights into the contactin 1 – neurofascin 155 adhesion complex","Chataigner, Lucas M.P. (Universiteit Utrecht); Gogou, C. (TU Delft BN/Dimphna Meijer Lab; Kavli institute of nanoscience Delft); den Boer, Maurits A. (Universiteit Utrecht; Netherlands Proteomics Center); Pereira Frias, C.S. (TU Delft BN/Dimphna Meijer Lab; Kavli institute of nanoscience Delft); Thies-Weesie, Dominique M.E. (Universiteit Utrecht); Granneman, Joke C.M. (Universiteit Utrecht); Heck, Albert J.R. (Universiteit Utrecht); Meijer, D.H.M. (TU Delft BN/Dimphna Meijer Lab; TU Delft BN/Bionanoscience; Kavli institute of nanoscience Delft); Janssen, Bert J.C. (Universiteit Utrecht)","","2022","Cell-surface expressed contactin 1 and neurofascin 155 control wiring of the nervous system and interact across cells to form and maintain paranodal myelin-axon junctions. The molecular mechanism of contactin 1 – neurofascin 155 adhesion complex formation is unresolved. Crystallographic structures of complexed and individual contactin 1 and neurofascin 155 binding regions presented here, provide a rich picture of how competing and complementary interfaces, post-translational glycosylation, splice differences and structural plasticity enable formation of diverse adhesion sites. Structural, biophysical, and cell-clustering analysis reveal how conserved Ig1-2 interfaces form competing heterophilic contactin 1 – neurofascin 155 and homophilic neurofascin 155 complexes whereas contactin 1 forms low-affinity clusters through interfaces on Ig3-6. The structures explain how the heterophilic Ig1-Ig4 horseshoe’s in the contactin 1 – neurofascin 155 complex define the 7.4 nm paranodal spacing and how the remaining six domains enable bridging of distinct intercellular distances.","","en","journal article","","","","","","","","","","BN/Bionanoscience","BN/Dimphna Meijer Lab","","",""
"uuid:7b11804e-ea62-4537-a644-2249e5d8bdd5","http://resolver.tudelft.nl/uuid:7b11804e-ea62-4537-a644-2249e5d8bdd5","Coordination between Governmental Resources and Citizen Engagement with Open Government Data: A Coupling Coordinated Model","Zhang, Ying (Zhejiang University); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Amaral, Luis (editor); Soares, Delfina (editor); Zheng, Lei (editor)","2022","Government resources used for opening data and citizen engagement with open government data (OGD) are expected to have a mutual influence, but this has not been empirically investigated. Therefore, this paper investigates this mutual relationship by measuring both governmental resources and citizen engagement based on resource-based theory. The weight of their measurements is evaluated by the entropy method. Data was collected from 337 Chinese municipal governments to investigate whether governmental resources and citizen engagement with OGD are dependent. The findings by a coupling coordinated model and regression analysis revelated that: Although governmental resources and citizen engagement with OGD have a strong interaction, the coordination between them is low. An explanation for this is that the development of citizen engagement with OGD lags behind the deployment of governmental resources in most Chinese cities.","citizen engagement; coordination; governmental resources; open government data","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-04-18","","Engineering, Systems and Services","","","",""
"uuid:3cb347a2-a25f-4b4c-8ad7-5740b11ccf3c","http://resolver.tudelft.nl/uuid:3cb347a2-a25f-4b4c-8ad7-5740b11ccf3c","Contextual poverty and obtained educational level and income in Sweden and the Netherlands: A multi-scale and longitudinal study","Andersson, Eva (Stockholm University); Janssen, Heleen (Max Planck Institute); van Ham, M. (TU Delft Urbanism); Malmberg, Bo (Stockholm University)","","2022","Studies of neighbourhood effects typically measure the neighbourhood context at one specific spatial scale. It is increasingly acknowledged, however, that the mechanisms through which the residential context affects individual outcomes may operate at different spatial scales, ranging from the very immediate environment to the metropolitan region. We take a multi-scale approach to investigate the extent to which concentrated poverty in adolescence is related to obtained education level and income later in life, by measuring the residential context as bespoke neighbourhoods at five geographical scales that range from areas encompassing the 200 nearest neighbours to areas that include the 200k+ nearest neighbours. We use individual-level geocoded longitudinal register data from Sweden and the Netherlands to follow 15/16-year-olds until they are 30 years old. The findings show that the contextual effects on education are very similar in both countries. Living in a poor area as a teenager is related to a lower obtained educational level when people are in their late 20s. This relationship, however, is stronger for lower spatial scales. We also find effects of contextual poverty on income in both countries. Overall, this effect is stronger in the Netherlands than in Sweden. Partly, this is related to differences in spatial structure. If only individuals in densely populated areas in Sweden are considered, effects on income are similar across the two countries and income effects are more stable across spatial scales. Overall, we find important evidence that the scalar properties of neighbourhood effects differ across life-course outcomes.","bespoke neighbourhoods; contextual poverty; education; income; multi-scale; neighbourhood effects","en","journal article","","","","","","","","","","Urbanism","","","",""
"uuid:004ea67f-b562-4b4a-91f3-13df10c5eae3","http://resolver.tudelft.nl/uuid:004ea67f-b562-4b4a-91f3-13df10c5eae3","Governance and societal impact of blockchain-based self-sovereign identities","Benchaya Gans, R (TU Delft Information and Communication Technology); Ubacht, J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","Traditionally, governments and companies store data to identify persons for services provision and interactions. The rise of self-sovereign identities (SSIs) based on blockchain technologies provides individuals with ownership and control over their personal data and allows them to share their data with others using a sort of “digital safe.” Fundamentally, people have the sole ownership of their identity data and control when and how it is shared, protecting their privacy. As these data need to be validated to be trusted, they may become a more important data source for digital information sharing and transactions than the formal source of identity controlled by governments. Furthermore, SSIs can be used for interacting digitally with any organization. These developments change the relationship between government, companies, and individuals. We explore information sharing and governance in the digital society using blockchain-based SSIs. In addition, the impact of SSIs on data storage in the digital world is assessed. Technology enactment might result in no greater control or privacy and might only reinforce current practices. Finally, we argue that regulation and a combination of centralized and decentralized governance are still required to avoid misuse and ensure that envisaged benefits are realized.","blockchain; governance; self-sovereign identities; technology enactment","en","journal article","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:753e0d96-d4f9-454c-82e3-2e3d0e4acdf2","http://resolver.tudelft.nl/uuid:753e0d96-d4f9-454c-82e3-2e3d0e4acdf2","Accountable AI for Healthcare IoT Systems","Bagave, P. (TU Delft Information and Communication Technology); Westberg, M. (TU Delft Information and Communication Technology); Dobbe, R.I.J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Ding, Aaron Yi (TU Delft Information and Communication Technology)","","2022","Various AI systems have taken a unique space in our daily lives, helping us in decision-making in critical as well as non-critical scenarios. Although these systems are widely adopted across different sectors, they have not been used to their full potential in critical domains such as the healthcare sector enabled by the Internet of Things (IoT). One of the important hindering factors for adoption is the implication for accountability of decisions and outcomes affected by an AI system, where the term accountability is understood as a means to ensure the performance of a system. However, this term is often interpreted differently in various sectors. Since the EU GDPR regulations and the US congress have emphasised the importance of enabling accountability in AI systems, there is a strong demand to understand and conceptualise this term. It is crucial to address various aspects integrated with accountability and understand how it affects the adoption of AI systems. In this paper, we conceptualise these factors affecting accountability and how it contributes to a trustworthy healthcare AI system. By focusing on healthcare IoT systems, our conceptual mapping will help the readers understand what system aspects those factors are contributing to and how they affect the system trustworthiness. Besides illustrating accountability in detail, we also share our vision towards causal interpretability as a means to enhance accountability for healthcare AI systems. The insights of this paper shall contribute to the knowledge of academic research on accountability, and benefit AI developers and practitioners in the healthcare sector.","Accountability; Healthcare AI; Internet of Things (IoT); Trustworthiness","en","conference paper","Institute of Electrical and Electronics Engineers (IEEE)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-09-15","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:d328799d-b8bc-4dba-942e-f8b00afc7bba","http://resolver.tudelft.nl/uuid:d328799d-b8bc-4dba-942e-f8b00afc7bba","Balancing fraud analytics with legal requirements: Governance practices and trade-offs in public administrations","Simonofski, Anthony (University of Namur); Tombal, Thomas (Tilburg University); De Terwangne, Cécile (University of Namur); Willem, Pauline (University of Namur); Frenay, Benoît (University of Namur); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2022","Fraud analytics refers to the use of advanced analytics (data mining, big data analysis, or artificial intelligence) to detect fraud. While fraud analytics offers the promise of more efficiency in fighting fraud, it also raises legal challenges related to data protection and administrative law. These legal requirements are well documented but the concrete way in which public administrations have integrated them remains unexplored. Due to the complexity of the techniques applied, it is crucial to understand the current state of practice and the accompanying challenges to develop appropriate governance mechanisms. The use of advanced analytics in organizations without appropriate organizational change can lead to ethical challenges and privacy issues. The goal of this article is to examine how these legal requirements are addressed in public administrations and to identify the challenges that emerge in doing so. For this, we examined two case studies related to fraud analytics from the Belgian Federal administration: the detection of tax frauds and social security infringements. This article details 15 governance practices that have been used in administrations. Furthermore, it highlights the complexity of integrating legal requirements with advanced analytics by identifying six key trade-offs between fraud analytics opportunities and legal requirements.","artificial intelligence; big data; fraud analytics; governance; public administration","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:48e91018-7d12-4a4e-a948-6f2014a93aaa","http://resolver.tudelft.nl/uuid:48e91018-7d12-4a4e-a948-6f2014a93aaa","De unieke waarde van de wooncoöperatie","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2022","Recensie. ‘Operatie wooncoöperatie’ van Arie Lengkeek en Peter Kuenzli is volgens recensent Céline Janssen zowel een naslagwerk als een manifest voor het aanjagen van dit betaalbare alternatief op de peperdure woningmarkt. Een aanrader volgens Janssen:“u zou deze woonrevolutie niet willen missen!”","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:9fe87cdc-c084-4593-829b-717f55734f83","http://resolver.tudelft.nl/uuid:9fe87cdc-c084-4593-829b-717f55734f83","Publiek-private organisaties maken Wenen sociaal","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2022","Doelen voor sociale duurzaamheid zijn in gebiedsontwikkeling al snel het kind van de rekening. Promovendus Céline Janssen ging op werkbezoek in Wenen en zag daar hoe het óók kan. Het geheim? Publiek-privaat stadtteilmanagement.","","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:964ebbc7-0802-46d8-adce-46a1c562a339","http://resolver.tudelft.nl/uuid:964ebbc7-0802-46d8-adce-46a1c562a339","The influence of cognitive bias on crisis decision-making: Experimental evidence on the comparison of bias effects between crisis decision-maker groups","Paulus, D. (TU Delft Organisation & Governance); de Vries, G. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Van de Walle, Bartel (UNU-MERIT)","","2022","A crisis requires the affected population, governments or non-profit organizations, as well as crisis experts, to make urgent and sometimes life-critical decisions. With the urgency and uncertainty they create, crises are particularly amenable to inducing cognitive biases that influence decisionmaking. However, there is limited empirical evidence regarding the impact of cognitive biases on estimation, judgment, and decision-making tasks in crises. Possible biases occurring in crises are: (1) to be influenced by how information is framed (i.e., framing effect), (2) to overly rely on information that confirms rather than opposes preliminary assumptions (i.e., confirmation bias), (3) to rely heavily on a skewed informational cue when making estimations (i.e., anchoring bias), and (4) to see the own decision-making as less biased than decision-making of others (i.e., bias blind spot). We investigate these four cognitive biases using three online survey experiments targeting crisis-affected people of the general public (n = 460, mTurk workers), governmental and non-profit workers (n = 50, mTurk workers), and crisis experts (n = 21, purposefully
sampled). Our findings show that crisis experts are the least biased group but are still significantly affected by anchoring, framing, and bias blind spot. Crisis-affected people from the general public showed the strongest susceptibility to all four biases studied. The findings have implications for future research on crisis information systems (IS) design. As crisis response is increasingly facilitated through IS, we propose debiasing functions that account for biased user behavior in crises.","Crisis response; Cognitive bias; Decision-making; Estimation; Judgment; Information systems","en","journal article","","","","","","","","","","Engineering, Systems and Services","Organisation & Governance","","",""
"uuid:2615f976-84e5-4f92-ae49-7cec13cae239","http://resolver.tudelft.nl/uuid:2615f976-84e5-4f92-ae49-7cec13cae239","Identifying Business Models of Open Data Intermediaries: A Review","Shaharudin, Ashraf (TU Delft Urban Data Science); van Loenen, B. (TU Delft Urban Data Science); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2023","Open data has many potential benefits including stimulating innovation, enhancing accountability and transparency, and improving the reproducibility and dissemination of research (Janssen et al., 2012; Uhlir and Schröder, 2007; Zhu et al., 2019). However, there are various shortcomings in the current open data initiatives such as the mismatch between the supply and demand of open data, the lack of appropriate software to process data, and confusion regarding data licenses (Johnson et al., 2017; van Loenen et al., 2021). The role of open data intermediaries is considered important to address these weaknesses. Open data intermediaries facilitate the use of and access to open data (Chattapadhyay, 2014; González-Zapata and Heeks, 2015) and build connections among open data stakeholders (Mayer-Schönberger and Zappia, 2011). It follows that open data intermediaries are regarded as one of the priority areas in open data research (Davies and Perini, 2016). Nevertheless, in-depth studies on open data intermediaries are scarce. Within the limited studies, they are found to face several challenges that may undermine their potential contribution to other open data stakeholders. For example, lack of financial planning (Flores, 2020), over-reliance on volunteers (Reggi and Dawes, 2016), and difficulty in securing data experts (Andrason and van Schalkwyk, 2017). Some of these challenges are associated with the lack of development of open data intermediaries’ business models (Kitsios et al., 2021; Reggi and Dawes, 2016). Before any research-based development of their business models can be carried out, a clear view of the existing business models is needed. Given this, the objective of this extended abstract is to review existing business models of open data intermediaries from the academic literature through a systematic literature review (SLR). Section 2 provides a brief background on the concept of a business model. Section 3 describes the research method. Section 4 presents the findings. Last but not least, Section 5 discusses the findings and proposes considerations for future studies.","open data; intermediaries; infomediaries; business models; revenue; value","en","abstract","","","","","","","","","","Engineering, Systems and Services","Urban Data Science","","",""
"uuid:8b46e520-ad50-4c26-b3fb-7b8190ac4812","http://resolver.tudelft.nl/uuid:8b46e520-ad50-4c26-b3fb-7b8190ac4812","Missions as boundary objects for transformative change: Understanding coordination across policy, research, and stakeholder communities","Janssen, Matthijs J. (Universiteit Utrecht; Dialogic); Wesseling, Joeri (Universiteit Utrecht); Torrens, Jonas (Eindhoven University of Technology); Weber, K. Matthias (AIT Austrian Institute of Technology; Gustave Eiffel University); Penna, C.C.R. (TU Delft Economics of Technology and Innovation); Klerkx, Laurens (Wageningen University & Research; Universiteit Utrecht; University of Talca)","","2023","Recent times have seen the rediscovery and adaptation of mission-oriented innovation policies (MIPs) for driving transformative change. While such policies seek to mobilise and align stakeholders, little is known about how missions feature in policy coordination processes. We argue that to facilitate the still troublesome operationalisation of MIPs, it is essential to understand missions as ‘boundary objects’ that have some shared meanings among the participants they convene, yet are open enough to be interpreted differently by distinct actors gathering in four interconnected policy arenas—i.e. a strategic, programmatic, implementation, and performance arena. By studying the European Commission’s Horizon Europe missions, we unravel how missions as boundary objects enable and disable the coordination of heterogeneous communities. The resulting analytical perspective highlights three key mechanisms for coordinating mission meanings across communities and arenas: convergence–divergence, passage, and reflexive learning. We conclude with research avenues for studying missions as boundary objects for facilitating concerted action.","","en","journal article","","","","","","","","","","","Economics of Technology and Innovation","","",""
"uuid:d9669dae-7bc1-4551-8d86-9bd01f7d2101","http://resolver.tudelft.nl/uuid:d9669dae-7bc1-4551-8d86-9bd01f7d2101","Royal epistolary courtship in Latin? Arthur Tudor's “love letter” to Katherine of Aragon at the Archivo General de Simancas and Francesco Negri's Ars Epistolandi","Janssen, K.P.S. (Universiteit Leiden); van Pelt, N.T. (TU Delft Instituut voor Talen en Academische Vaardigheden)","","2023","The Archivo General de Simancas in Valladolid has preserved a letter attributed to Arthur Tudor, categorized as ‘declarándole su ardiente pasión amorosa’ [declaring his ardent loving passion]. Its recipient has been thought to be Katherine of Aragon. The lack of scholarly interest in this letter is remarkable, but may be caused by its having been calendared in the nineteenth century as written by Perkin Warbeck. In what follows we unlock the mystery of the AGS letter by returning to its original Latin. We reveal that it very closely follows an exemplum from Francesco Negri's educational bestseller Ars Epistolandi, first published in 1488. Interestingly, Negri used the exemplum to show readers how not to write a letter, and categorized it as ‘turpis’, or, ‘lewd’. We present here an edition with a translation of both the AGS letter and Negri's sample. Our evidence suggests that ‘Arthur's letter’ is not a declaration of love to send to a recipient, but a school exercise in line with Humanist training. As such, it may not provide a window to Arthur's passionate nature, but it does offer important insights into educational practices in the context of the Tudor court towards the end of the 15th century.","","en","journal article","","","","","","","","","","Instituut voor Talen en Academische Vaardigheden","","","",""
"uuid:5254d316-3112-4da5-b0da-1c80decf528e","http://resolver.tudelft.nl/uuid:5254d316-3112-4da5-b0da-1c80decf528e","Whither the need and motivation for open government data (OGD) promotional strategies?","Alexopoulos, Charalampos (University of the Aegean); Saxena, Stuti; Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Rizun, Nina (Politechnika Gdanska)","","2023","Purpose: It has been underscored in the extant literature that open government data (OGD) has not percolated across the length and breadth of any country, let alone the awareness of the OGD among the stakeholders themselves. In this vein, this study aims to underline the reasons as to why OGD promotion merits consideration apart from underlining the manner in which OGD promotion may be done. Design/methodology/approach: Based on literature review on the OGD conceptual models and government promotion initiatives, the study further sketches an OGD model across four quadrants: beginners, followers, fast-trackers, trend-setters on the basis of the progress made in their OGD initiatives besides underlining the four elements of OGD promotional strategy as media, arena, substance and stakeholders. Also, the study explores the drivers and barriers to OGD promotional initiatives. Findings: The study shows that across the OGD quadrants, the promotional strategies vary in terms of the 4As (acceptability, affordability, accessibility and awareness), and the same get reflected across MASS. Further, the drivers for OGD promotional initiatives are building citizens’ trust and forging stakeholder participation and collaboration in administration, thereby furthering transparency in administration, meeting the needs of the stakeholders, providing the desired impetus to value creation and innovation by the stakeholders and the need for furthering economic growth. Likewise, the barriers toward OGD promotion are linked with the lack of political will, lack of organizational leadership, mission and vision, lack of involvement of government departments, lack of budget and lack of requisite infrastructure for promotion. Originality/value: Hitherto, OGD research has underscored the need to make the users aware of the potential of OGD initiative; however, no study has been undertaken to understand the manner in which the awareness may be driven among the users – the present study is a first step in this direction.","Barriers; Drivers; Literature review; OGD; Open government data; Promotion","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:af5b5477-74a6-42be-9843-aa2b3e7d9902","http://resolver.tudelft.nl/uuid:af5b5477-74a6-42be-9843-aa2b3e7d9902","Data Analytics Platforms: Value Propositions and Adoption Challenges for Small Hospitality Businesses","Ofe, H.A. (TU Delft Information and Communication Technology); de Reuver, Mark (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Nederstigt, Bouke (Student TU Delft)","","2023","Managers increasingly seek ways to explore insights from data for business improvements and innovation. Data Analytics (DA) platforms hold promise for businesses, especially small businesses that cannot afford tailor-made proprietary analytics services. DA platforms offer generic analytics features to a pool of businesses, saving costs and enabling benchmarking. This paper explores value propositions and adoption challenges for small businesses regarding DA. The paper offers practical insights from designing and launching a DA platform targeting small businesses in the hospitality sector. The findings of our paper show that data analytics is potentially valuable for small businesses through insights into market and customer trends. Small businesses can leverage such insights to refine their offerings. Trust and privacy concerns in sharing data are key challenges holding back adoption. We proposed measures, especially privacy-preserving technologies, to mitigate the risk of tracing a specific enterprise's data shared on the DA platform. These measures assure businesses that data shared or analysed through the DA platform is not used to harm their competitive advantage.","Data insights; Small businesses; value propositions; adoption; data analytics","en","conference paper","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:9882e6e2-1689-45cd-83bc-b94df32d241d","http://resolver.tudelft.nl/uuid:9882e6e2-1689-45cd-83bc-b94df32d241d","Bias Detection and Generalization in AI Algorithms on Edge for Autonomous Driving","Katare, D. (TU Delft Information and Communication Technology); Kourtellis, Nicolas (Telefonica Research); Park, Souneil (Telefonica Research); Perino, Diego (Telefonica Research); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Ding, Aaron Yi (TU Delft Information and Communication Technology)","","2023","A machine learning model can often produce biased outputs for a familiar group or similar sets of classes during inference over an unknown dataset. The generalization of neural networks have been studied to resolve biases, which has also shown improvement in accuracy and performance metrics, such as precision and recall, and refining the dataset's validation set. Data distribution and instances included in test and validation-set play a significant role in improving the generalization of neural networks. For producing an unbiased AI model, it should not only be trained to achieve high accuracy and minimize false positives. The goal should be to prevent the dominance of one class/feature over the other class/feature while calculating weights. This paper investigates state-of-art object detection/classification on AI models using metrics such as selectivity score and cosine similarity. We focus on perception tasks for vehicular edge scenarios, which generally include collaborative tasks and model updates based on weights. The analysis is performed using cases that include the difference in data diversity, the viewpoint of the input class and combinations. Our results show the potential of using cosine similarity, selectivity score and invariance for measuring the training bias, which sheds light on developing unbiased AI models for future vehicular edge services.","","en","conference paper","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:572479ec-c476-4d8a-a743-7473e7a9d92e","http://resolver.tudelft.nl/uuid:572479ec-c476-4d8a-a743-7473e7a9d92e","Editorial Technology Assessment for Addressing Grand Societal Challenges","Kuk, George (Nottingham Business School, Nottingham); Faik, Isam (Ivey Business School, London); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2023","Emerging technologies are both a cause of many grand societal challenges (GSCs) facing twenty-first-century societies and an integral part of some of their most promising solutions. As an element of the GSCs, technology becomes intertwined with several interrelated issues that constitute the GSCs. This calls for approaches to Technology Assessment (TA) that account for the paradoxical role of technology in the GSCs, and the imperative and complexity of pointing technological innovation toward addressing the GSCs. In this introduction to the special issue, we identify three major streams in TA research and practice, namely TA as a policy instrument, a deliberation process, and an issue field. These streams highlight tensions between relying on experts and on the inclusion of various stakeholders in TA processes, and between a TA framing around the intersection of technology and critical issues around critical issues, such as those constituting the GSCs. We discuss the advantages and challenges of each stream. We also outline and discuss key principles for conducting TA in the context of GSCs. We end by introducing the four papers that constitute this special issue.","","en","review","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-08-10","","Engineering, Systems and Services","","","",""
"uuid:99aef80e-80be-4de2-899f-1c702dc9b264","http://resolver.tudelft.nl/uuid:99aef80e-80be-4de2-899f-1c702dc9b264","“So what if ChatGPT wrote it?” Multidisciplinary perspectives on opportunities, challenges and implications of generative conversational AI for research, practice and policy","Dwivedi, Yogesh K. (Symbiosis Institute of Business Management, Pune); Kshetri, Nir (Bryan School of Business and Economics); Hughes, Laurie; Balakrishnan, Janarthanan (National Institute of Technology - Tiruchirappalli); Buhalis, Dimitrios (Bournemouth University Business School); Dennehy, Denis; Dubey, Rameshwar (Liverpool Business School); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2023","Transformative artificially intelligent tools, such as ChatGPT, designed to generate sophisticated text indistinguishable from that produced by a human, are applicable across a wide range of contexts. The technology presents opportunities as well as, often ethical and legal, challenges, and has the potential for both positive and negative impacts for organisations, society, and individuals. Offering multi-disciplinary insight into some of these, this article brings together 43 contributions from experts in fields such as computer science, marketing, information systems, education, policy, hospitality and tourism, management, publishing, and nursing. The contributors acknowledge ChatGPT's capabilities to enhance productivity and suggest that it is likely to offer significant gains in the banking, hospitality and tourism, and information technology industries, and enhance business activities, such as management and marketing. Nevertheless, they also consider its limitations, disruptions to practices, threats to privacy and security, and consequences of biases, misuse, and misinformation. However, opinion is split on whether ChatGPT's use should be restricted or legislated. Drawing on these contributions, the article identifies questions requiring further research across three thematic areas: knowledge, transparency, and ethics; digital transformation of organisations and societies; and teaching, learning, and scholarly research. The avenues for further research include: identifying skills, resources, and capabilities needed to handle generative AI; examining biases of generative AI attributable to training datasets and processes; exploring business and societal contexts best suited for generative AI implementation; determining optimal combinations of human and generative AI for various tasks; identifying ways to assess accuracy of text produced by generative AI; and uncovering the ethical and legal issues in using generative AI across different contexts.","ChatGPT; Conversational agent; Generative AI; Generative artificial intelligence; Large language models","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:29d41dc9-ad7e-40de-aa97-3072a48dea57","http://resolver.tudelft.nl/uuid:29d41dc9-ad7e-40de-aa97-3072a48dea57","Unlocking the Potential of Smart Technologies: Addressing Adoption Challenges","Sharma, Sujeet K. (Indian Institute of Management Nagpur); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Bunker, Deborah (University of Sydney); Dominguez-Péry, Carine (Université Grenoble Alpes); Singh, Jang Bahadur (Indian Institute of Management Tiruchirappalli); Dwivedi, Yogesh K. (Symbiosis Institute of Business Management, Pune; Swansea University); Misra, Santosh K. (Government of Tamil Nadu)","","2023","","","en","contribution to periodical","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-11-27","","Engineering, Systems and Services","","","",""
"uuid:21c95f7d-5185-419b-bd82-25d888e30841","http://resolver.tudelft.nl/uuid:21c95f7d-5185-419b-bd82-25d888e30841","WebAndTheCity'23: 9th International Workshop on The Web and Smart Cities","Anthopoulos, Leonidas (University of Thessaly); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Weerakkody, Vishanth (Bradford University)","","2023","This is the 9th edition of the workshop series labeled ""AW4City - Web Applications and Smart Cities"", which started back in Florence in 2015 and kept on taking place every year in conjunction with the WWW conference series. Last year the workshop was held virtually in Lyon, France. The workshop series aims to investigate the Web and Web applications' role in establishing smart city (SC) promises. The workshop series aim to investigate the role of the Web and of Web applications in SC growth. This year, the workshop focuses on the role of the web in social coherence. cities appear to play a crucial role in securing humanity against social threats and generating sustainable and circular cities. In this regard, cities attempt to secure social sustainability and coherence (e.g., deal with affordable energy, poverty, hunger, equal opportunities in education, jobs, and health, etc.) and enhance their performance to become friendlier and able to host their increasing populations. Additionally, new types of business appear (e.g., for smart energy), while the co-existence of autonomous things and people generate another challenge that cities have started phasing. This workshop aims to demonstrate how web applications Apps can Web intelligence serve communities.","smart citizens; smart city; smart living; web Apps","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:6a89a445-e792-4b68-9a7b-2568cff04a33","http://resolver.tudelft.nl/uuid:6a89a445-e792-4b68-9a7b-2568cff04a33","Transforming the Internal Audit Function (IAF): An Integrated MICMAC-ISM Approach for Unravelling the Relationship Among Challenges","Ramadhan, M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); van der Voort, H.G. (TU Delft Organisation & Governance)","Janssen, Marijn (editor); Matheus, Ricardo (editor); Pinheiro, Luiz (editor); Frankenberger, Fernanda (editor); Dwivedi, Yogesh K. (editor); Pappas, Ilias O. (editor); Mäntymäki, Matti (editor)","2023","The transformation toward the use of data analytics requires overcoming many challenges. Nevertheless, the interconnections between the challenges are unclear. Gaining knowledge about these interconnections is important to prioritize strategies that aim to stimulate the transformation. This paper unravels the relationship among Audit Analytics (AA) implementation challenges to transform the Internal Audit Function (IAF) using Matrice d’Impacts Croisés Multiplication Appliqués à un Classement (MICMAC) – Interpretative Structural Modelling (ISM) (or MICMAC-ISM) to develop a hierarchical model and determine the relationships among the challenges and the degree of power of each challenge. We collect data from internal auditors experienced in using audit analytics. They suggest that cultural challenges, along with technical challenges, are critical for enabling transformation. Moreover, combinations of approaches are required to address the complex interrelationships among challenges to initiate transformation. The analysis suggests that AA implementation requires a top-down approach to address cultural challenges blended with a bottom-up strategy to overcome technical challenges.","Audit Analytics; Internal Audit Function; MICMAC-ISM; Transformation","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-06-15","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:efeeaa17-5c1c-43d8-93a5-93fdf5953abe","http://resolver.tudelft.nl/uuid:efeeaa17-5c1c-43d8-93a5-93fdf5953abe","Uncovering the challenges of urban digital twins: Identifying and ranking the barriers to operating digital twins in cities","Lei, Binyu (National University of Singapore); Stoter, J.E. (TU Delft Urban Data Science); Janssen, Patrick (White Lioness Technologies); Biljecki, Filip (National University of Singapore)","","2023","To encourage discussion of the challenges hindering the design and implementation of digital twins, the authors have ranked them based on a systematic literature review combined with an expert survey.","","en","journal article","","","","","","","","","","","Urban Data Science","","",""
"uuid:658e11f2-a6f2-4bb2-b744-fd33fae2835e","http://resolver.tudelft.nl/uuid:658e11f2-a6f2-4bb2-b744-fd33fae2835e","Design Principles for Developing Open Source Urbanism","Zhilin, S. (TU Delft Human-Centred Artificial Intelligence); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Lindgren, Ida (editor); Csáki, Csaba (editor); Kalampokis, Evangelos (editor); Tambouris, Efthimios (editor); Janssen, Marijn (editor); Zuiderwijk, Anneke (editor); Viale Pereira, Gabriela (editor); Virkar, Shefali (editor)","2023","In Open Source Urbanism (OSU) citizens self-organize and create Do-It-Yourself (DIY) urban designs to address societal problems. Self-organized citizens develop these designs, but there is no support for the design process based on the co-creation and involvement of citizens. The latter are mainly non-experts. Three aspects characterize OSU: (1) OSU initiatives are initialized by citizens; (2) OSU initiatives are the new commons, are collectively created and managed by self-organized citizens; (3) to last, DIY should be accepted by or co-produced with the authorities as they can change the urban environment. This research offers a set of design principles to guide the cultivation of OSU infrastructures in the self-organized setting of urban commons. We derived the principles from an ethnographic study of an Amsterdam-based citizen initiative. This paper offers a set of design principles to guide the cultivation of OSU infrastructures in the self-organized setting of the urban commons. We introduce eight design principles: (1) Co-creation, (2) Trust-building, (3) Motivating, (4) Growing, (5) Showcasing, (6) Bridging, (7) Open-sourcing, and (8) Peer Production. By promoting self-organized, community-led development, our design principles offer guidelines for urban commons communities, academics, and decision-makers to work towards a shared vision of the future of inclusive cities. Building trust and gaining access to expertise are key aspects of OSU cultivation.","citizen initiatives; design ethnography; design principles; urban commons","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-02-20","","Engineering, Systems and Services","Human-Centred Artificial Intelligence","","",""
"uuid:4c26ba30-7720-4adc-ac6a-316ad8b9c71d","http://resolver.tudelft.nl/uuid:4c26ba30-7720-4adc-ac6a-316ad8b9c71d","Editorial: EGOV-CeDEM-ePart 2023","Ubacht, J. (TU Delft Information and Communication Technology); Csáki, Csaba; Danneels, Lieselot; Edelmann, Noella; Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Kalampokis, Evangelos; Lindgren, Ida; Novak, Anna Sophie; Panagiotopoulos, Panos; Parycek, Peter; Pereira, Gabriela Viale; Susha, I. (TU Delft Information and Communication Technology); Schwabe, Gerhard; Virkar, Shefali; Tambouris, Efthimios; Zuiderwijk-van Eijk, A.M.G. (TU Delft Information and Communication Technology)","","2023","","","en","contribution to periodical","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:9efe3b44-5362-41bf-9bea-f427cf4a691f","http://resolver.tudelft.nl/uuid:9efe3b44-5362-41bf-9bea-f427cf4a691f","How Supervisory Board Members Influence Digital Strategy: Towards a Framework for Digital Strategy Governance","van Golden, Simone L. (Nyenrode Business Universiteit); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Kievit, Henk (Nyenrode Business Universiteit)","Janssen, Marijn (editor); Matheus, Ricardo (editor); Pinheiro, Luiz (editor); Frankenberger, Fernanda (editor); Dwivedi, Yogesh K. (editor); Pappas, Ilias O. (editor); Mäntymäki, Matti (editor)","2023","Since digital opportunities will continue altering business models, organizations need to formulate and execute digital strategies to sustain long-term value. A digital strategy is governed by the organization’s board. A board consists of executive and non-executive members, whereas in a two-tier system, the non-executive members form a supervisory board that is decoupled from the executive board. We present a framework illustrating how the actions of supervisory board members might influence digital strategy. We developed this framework based on a structured literature review with insights from corporate governance, strategic management, and board-level IT governance. We found that supervisory board members execute a variety of actions to take and shape strategic decisions and shape the strategic content, context, and conduct within their organization. We integrated our findings into sixteen potential actions that supervisory board members can take to influence digital strategy formulation, execution, and context. Further research should evaluate the framework and investigate the impact of their actions on digital strategies.","board member actions; board-level IT governance; digital strategy; digital strategy governance; supervisory board member","en","conference paper","Springer","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-06-15","","Engineering, Systems and Services","","","",""
"uuid:72d7aaa2-dc4b-4969-a0ac-c8216f1542ca","http://resolver.tudelft.nl/uuid:72d7aaa2-dc4b-4969-a0ac-c8216f1542ca","Introduction to the Special Issue on Citizen Centricity in Smart Cities","Anthopoulos, Leonidas (University of Thessaly); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Weerakkody, Vishanth (Bradford University)","","2023","City digital transformation is being performed across the globe and it is being supported by several initiatives and policy groups. Nevertheless, this transformation is mainly technology oriented. Although there have been several interesting and impactful outcomes, like solutions for enhancing municipal efficiency and local living, the results lag behind expectations. Real transformation should also change structures and address the whole range from social to technical aspects. People-centricity in this transformation is an emerging topic that is attracting attention and some initiatives have launched. People-centric transformation can be defined as a multi-stakeholder approach to digital transformation that realizes sustainability, inclusiveness, prosperity, and human rights for the benefit of all. The aim of this special issue is to better understand all aspects of citizen centricity and how it can change the orientation of city digital transformation process. The special issue highlights the main elements of people-centricity in cities: inclusiveness, openness, engagement and empowerment via securing citizen awareness, data privacy, service simplification and transparency, and technological availability and observability.","citizenship; governance; Human centricity; smart city","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:bd11cc1c-884b-40bb-9f52-2a0e84196c8b","http://resolver.tudelft.nl/uuid:bd11cc1c-884b-40bb-9f52-2a0e84196c8b","Governance impacts of blockchain-based decentralized autonomous organizations: An empirical analysis","Rikken, O.K. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Roosenboom-Kwee, Z. (TU Delft Economics of Technology and Innovation)","","2023","The rapid rise in blockchain-based Decentralized Autonomous Organizations (DAOs) offers policy-makers and decision-makers new opportunities to automatically execute decisions and processes that help enhance transparency, accountability, participation and trust. Yet, many DAOs have a limited lifespan. There is little empirical evidence of the effect of governance elements on the viability of DAOs. Using 220 on-chain governed DAOs, this paper analyses how governance elements (accountability, decision/voting, and incentives) influence the viability of DAOs in the long-term. The findings show that DAOs without weighted decision-making and without incentive structures are more viable than those with weighted decision power and incentive mechanisms. This suggests that financial and share-like DAO governance elements do not or may even negatively contribute to the long-term viability of DAOs. Also, voting power distribution is found to have a statistically significant influence on DAOs’ viability. We further propose a preliminary theory that relates governance elements to the long-term viability of DAOs. These insights will help policy-makers in designing more viable DAOs. Future research should investigate how DAO objectives, the chosen deployment infrastructure and the type of users can impact the long-term viability of DAOs.","","en","journal article","","","","","","","","","","Engineering, Systems and Services","Economics of Technology and Innovation","","",""
"uuid:66c781a2-58c9-4e6d-9e55-ff386024d45e","http://resolver.tudelft.nl/uuid:66c781a2-58c9-4e6d-9e55-ff386024d45e","Upper-Body versus Lower-Body Cooling in Individuals with Paraplegia during Arm-Crank Exercise in the Heat","Alkemade, Puck (Vrije Universiteit Amsterdam); Eijsvogels, Thijs M.H. (Radboud University Medical Center); Janssen, Thomas W.J. (Vrije Universiteit Amsterdam; Amsterdam Institute of Sport Science); Jansen, K.M.B. (TU Delft Emerging Materials); Kingma, Boris R.M. (TNO); Daanen, Hein A.M. (Vrije Universiteit Amsterdam; Amsterdam Institute of Sport Science)","","2023","PURPOSE: For wheelchair users with a spinal cord injury, the lower body may be a more convenient cooling site than the upper body. However, it remains unknown if leg cooling reduces thermal strain in these individuals. We compared the impact of upper-body versus lower-body cooling on physiological and perceptual outcomes during submaximal arm-crank exercise under heat stress in individuals with paraplegia. METHODS: Twelve male participants with paraplegia (T4-L2, 50% complete lesion) performed a maximal exercise test in temperate conditions, and three heat stress tests (32°C, 40% relative humidity) in which they received upper-body cooling (COOL-UB), lower-body cooling (COOL-LB), or no cooling (CON) in a randomized counterbalanced order. Each heat stress test consisted of four exercise blocks of 15 min at 50% of peak power output, with 3 min of rest in between. Cooling was applied using water-perfused pads, with 14.8-m tubing in both COOL-UB and COOL-LB. RESULTS: Gastrointestinal temperature was 0.2°C (95% confidence interval (CI), 0.1°C to 0.3°C) lower during exercise in COOL-UB versus CON (37.5°C ± 0.4°C vs 37.7°C ± 0.3°C, P = 0.009), with no difference between COOL-LB and CON ( P = 1.0). Heart rate was lower in both COOL-UB (-7 bpm; 95% CI, -11 to -3 bpm; P = 0.01) and COOL-LB (-5 bpm; 95% CI, -9 to -1 bpm; P = 0.049) compared with CON. The skin temperature reduction at the cooled skin sites was larger in COOL-LB (-10.8°C ± 1.1°C) than in COOL-UB (-6.7°C ± 1.4°C, P < 0.001), which limited the cooling capacity in COOL-LB. Thermal sensation of the cooled skin sites was improved and overall thermal discomfort was lower in COOL-UB ( P = 0.01 and P = 0.04) but not in COOL-LB ( P = 0.17 and P = 0.59) compared with CON. CONCLUSIONS: Upper-body cooling more effectively reduced thermal strain than lower-body cooling in individuals with paraplegia, as it induced greater thermophysiological and perceptual benefits.","","en","journal article","","","","","","Publisher Copyright: Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American College of Sports Medicine.","","","","","Emerging Materials","","",""
"uuid:09d79587-8071-4dd0-97f0-304ebaae9e6a","http://resolver.tudelft.nl/uuid:09d79587-8071-4dd0-97f0-304ebaae9e6a","The ins and outs of decentralized autonomous organizations (DAOs): Unraveling the definitions, characteristics, and emerging developments of DAOs","Rikken, O.K. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Roosenboom-Kwee, Z. (TU Delft Economics of Technology and Innovation)","","2023","Despite the increase in the number of blockchain-based Decentralized Autonomous Organizations (DAOs), there is no consensus on what constitutes a DAO. This paper provides an in-depth study of DAOs by analyzing their definitions, characteristics, and emerging developments. Existing definitions in the literature hardly recognize common functionalities and intermingle coded DAOs, DAO deployment platforms, and blockchain DAOs. We developed a comprehensive DAO definition by reviewing the literature and empirically analyzing 1,859 DAOs. The findings show that many DAOs were inactive and that a threshold of 20 tokenholders is a tipping point for DAOs to survive over time and maintain sustained levels of activity. Finally, based on an empirical analysis of 9,845 perceived DAOs, we identified the emerging development of off-chain voting. This emerging development challenges the autonomous nature of DAOs. We recommend further research to investigate the effect of governance structures on their long-term sustainability and viability for both on-chain and off-chain DAOs.","","en","journal article","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:771066f2-dd2b-4f40-a728-c761ebec8b25","http://resolver.tudelft.nl/uuid:771066f2-dd2b-4f40-a728-c761ebec8b25","Comparison of Lower Arm Weight and Passive Elbow Joint Impedance Compensation Strategies in Non-Disabled Participants","Filius, S.J. (TU Delft Biomechatronics & Human-Machine Control); Janssen, Mariska (Radboud University Medical Center); van der Kooij, H. (TU Delft Support Biomechanical Engineering; TU Delft Biomechatronics & Human-Machine Control; University of Twente); Harlaar, J. (TU Delft Biomechatronics & Human-Machine Control; Erasmus MC)","","2023","People with severe muscle weakness in the upper extremity are in need of an arm support to enhance arm function and improve their quality of life. In addition to weight support, compensation of passive joint impedance (pJimp) seems necessary. Existing devices do not compensate for pJimp yet, and the best way to compensate for it is still unknown. The aim of this study is to 1) identify pJimp of the elbow, and 2) compare four different compensation strategies of weight and combined weight and pJimp in an active elbow support system. The passive elbow joint moments, including gravitational and pJimp contributions, were measured in 12 non-disabled participants. The four compensation strategies (scaled-model, measured, hybrid, and fitted-model) were compared using a position-tracking task in the near vertical plane. All four strategies showed a significant reduction (20–47%) in the anti-gravity elbow flexor activity measured by surface electromyography. The pJimp turned out to contribute to a large extent to the passive elbow joint moments (range took up 60%) in non-disabled participants. This underlines the relevance of compensating for pJimp in arm support systems. The parameters of the scaled-model and hybrid strategy seem to overestimate the gravitational component. Therefore, the measured and fitted-model strategies are expected to be most promising to test in people with severe muscle weakness combined with elevated pJimp.","","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-05-08","","","Biomechatronics & Human-Machine Control","","",""
"uuid:d2c76b3b-ec48-4d94-9de9-188f8ee891e9","http://resolver.tudelft.nl/uuid:d2c76b3b-ec48-4d94-9de9-188f8ee891e9","Effectiveness of Human-Supported and Self-Help eHealth Lifestyle Interventions for Patients With Cardiometabolic Risk Factors:: A Meta-Analysis","Cohen Rodrigues, Talia (Universiteit Leiden); Breeman, Linda D. (Universiteit Leiden); Kinik, Asena (Universiteit Leiden); Reijnders, Thomas (Universiteit Leiden); Dusseldorp, Elise (Universiteit Leiden); Janssen, Veronica (Universiteit Leiden); Kraaijenhagen, Roderik A. (Universiteit Leiden; NDDO Institute for Prevention and Early Diagnostics (NIPED), Amsterdam; Vital10, Amsterdam); Atsma, Douwe E. (Universiteit Leiden); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Erasmus Universiteit Rotterdam; Universiteit Leiden; Leiden University Medical Center)","","2023","Objective eHealth is a useful tool to deliver lifestyle interventions for patients with cardiometabolic diseases. However, there are inconsistent findings about whether these eHealth interventions should be supported by a human professional, or whether self-help interventions are equally effective. Methods Databases were searched between January 1995 and October 2021 for randomized controlled trials on cardiometabolic diseases (cardiovascular disease, chronic kidney disease, type 1 and 2 diabetes mellitus) and eHealth lifestyle interventions. A multilevel meta-analysis was used to pool clinical and behavioral health outcomes. Moderator analyses assessed the effect of intervention type (self-help versus human-supported), dose of human support (minor versus major part of intervention), and delivery mode of human support (remote versus blended). One hundred seven articles fulfilled eligibility criteria and 102 unique (N = 20,781) studies were included. Results The analysis showed a positive effect of eHealth lifestyle interventions on clinical and behavioral health outcomes (p <.001). However, these effects were not moderated by intervention type (p =.169), dose (p =.698), or delivery mode of human support (p =.557). Conclusions This shows that self-help eHealth interventions are equally effective as human-supported ones in improving health outcomes among patients with cardiometabolic disease. Future studies could investigate whether higher-quality eHealth interventions compensate for a lack of human support. Meta-analysis registration: PROSPERO CRD42021269263.","cardiovascular disease; chronic kidney disease; type 1 diabetes mellitus; type 2 diabetes mellitus; eHealth; lifestyle change; human support","en","journal article","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:ee9c2ce7-4c8e-4689-a5be-18de1c93090c","http://resolver.tudelft.nl/uuid:ee9c2ce7-4c8e-4689-a5be-18de1c93090c","Gentrification and the Origin and Destination of Movers: A Systematic Review","Janssen, K.M.J. (TU Delft Urban Studies); Cottineau, C. (TU Delft Urban Studies); Kleinhans, R.J. (TU Delft Urban Studies); van Bueren, Ellen (TU Delft Management in the Built Environment)","","2023","Gentrification is a process whereby neighbourhoods and their socio-economic composition upgrade through residential moves and social mobility. Relatively little attention has been paid to the spatial aspect of gentrification-induced residential moves. This systematic literature review focuses on the origin and destination of moves to and from gentrifying neighbourhoods, by gentrifiers (movers in) and displacees (movers out). It identifies where, when, and how such research has been conducted and highlights gaps in the literature. Our results suggest that the destination of displaced households has been studied extensively, while an understanding of the spatial origins of gentrifiers is lacking. The few studies dedicated to gentrifiers' origins mostly focus on intra-urban environments, overlooking potential mobility dynamics from outside the city-region. We highlight that capturing both origins and destinations of movers at different spatial scales is necessary to demonstrate how residential mobility creates interactions and demographic interdependencies between neighbourhoods and cities.","displacement; Gentrification; residential mobility; systematic literature review","en","journal article","","","","","","","","","","Management in the Built Environment","Urban Studies","","",""
"uuid:616f2ec2-20c0-475c-b7eb-1d3ba7d76580","http://resolver.tudelft.nl/uuid:616f2ec2-20c0-475c-b7eb-1d3ba7d76580","Diagnosing and Addressing Emergent Harms in the Design Process of Public AI and Algorithmic Systems","Nouws, S.J.J. (TU Delft Information and Communication Technology); Martinez de Rituerto de Troya, I. (TU Delft Information and Communication Technology); Dobbe, R.I.J. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Cid, David Duenas (editor)","2023","Algorithmic and data-driven systems are increasingly used in the public sector to improve the efficiency of existing services or to provide new services through the newfound capacity to process vast volumes of data. Unfortunately, certain instances also have negative consequences for citizens, in the form of discriminatory outcomes, arbitrary decisions, lack of recourse, and more. These have serious impacts on citizens ranging from material to psychological harms. These harms partly emerge from choices and interactions in the design process. Existing critical and reflective frameworks for technology design do not address several aspects that are important to the design of systems in the public sector, namely protection of citizens in the face of potential algorithmic harms, the design of institutions to ensure system safety, and an understanding of how power relations affect the design, development, and deployment of these systems. The goal of this workshop is to develop these three perspectives and take the next step towards reflective design processes within public organisations. The workshop will be divided into two parts. In the first half we will elaborate the conceptual foundations of these perspectives in a series of short talks. Workshop participants will learn new ways of protecting against algorithmic harms in sociotechnical systems through understanding what institutions can support system safety, and how power relations influence the design process. In the second half, participants will get a chance to apply these lenses by analysing a real world case, and reflect on the challenges in applying conceptual frameworks to practice.","Artificial Intelligence; data science; design process; institutional design; power analysis; public sector; system safety","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:6f80ba3f-9fa9-4b3d-a014-ec5e5fc97a61","http://resolver.tudelft.nl/uuid:6f80ba3f-9fa9-4b3d-a014-ec5e5fc97a61","Smart contracts for creating transparent transactions to reduce corruption","Darusalam, Subst (Universiti Teknologi MARA); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Said, Jamaliah (Universiti Teknologi MARA); Omar, Normah (Universiti Teknologi MARA); Indra Saputra, Muhammad (UIN Raden Fatah Palembang)","Cid, David Duenas (editor)","2023","Corruption is widely spread and not easy to avoid. Blockchain-based smart contract technology enables the opportunity to develop transactions in such a way that corruption should not be possible. In this paper, we develop and evaluate an arrangement based on blockchain-based smart contracts to avoid and reduce corruption. Smart contracts are used for buying and selling goods, in which the public must agree that the goods arrived and are used to contribute to the creation of societal value. Only then will the supplier be paid. Al transaction data is stored in a blockchain and opened to the public to create transparency. In this way, the price of the good and the sellers can be inspected to avoid price manipulation and nepotism. The smart contract avoids the likelihood that corruption will happen, and it can be spotted if it happens.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-01-11","","Engineering, Systems and Services","","","",""
"uuid:127c9784-ef05-44ca-acc0-2ee0d9be4141","http://resolver.tudelft.nl/uuid:127c9784-ef05-44ca-acc0-2ee0d9be4141","Why do Open Government Data initiatives fail in developing countries? A root cause analysis of the most prevalent barriers and problems","Alexopoulos, Charalampos (University of the Aegean); Saxena, Stuti (Not affiliated); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Rizun, Nina (Politechnika Gdanska); Lnenicka, Martin (University of Pardubice); Matheus, R. (TU Delft Information and Communication Technology)","","2023","Open government data (OGD) include the provision of government data, which have so far been reserved for the provision of public utilities and services, wherein different stakeholders may create value out of the same source. Recently, OGD initiatives around the world have dampened or were found to be inadequate for one or other reasons. The present study seeks to underline the root causes behind these inadequate or stalled initiatives with a specific focus on the developing countries. This article undertakes a literature review of the most significant studies in this area, followed by a root cause analysis wherein the database across Scopus and Web of Science has been explored with the set inclusion and exclusion criteria being set in line with the research focusing on the hinderances and bottlenecks behind the failure of OGD initiatives (n ~ 15), thus not only summarizing what has been revealed in previous studies but also identifying these “root-cause” relationships, which are responsible for the stalled OGD projects. A deep understanding of the literature on OGD shows that research of OGD barriers repeat each other. The results show that the main root causes include politico-administrative, social, technological, legal and organizational (inter- and intra) dimensions including aspects like state of the economy, infrastructural issues, the tendency to copy the OGD initiative without need to institutionalize the same, and so forth. Whereas a number of studies are available covering the barriers in the roll-out and implementation of OGD initiatives, the root causes behind the existence of these barriers have not been identified so far-the present study seeks to plug this gap. Besides being a contribution to the extant OGD literature in general, the study seeks to leave academic and practical implications for furthering up deliberations and discussions on the OGD themes with specific impetus upon the cause analysis of the failure in OGD initiatives and the manner in which the same may be corrected or preempted.","barrier; demand-side; Open Government Data; rootcause analysis; supply-side","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-01-26","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:ca68f483-16ba-4657-90b2-14beed27570c","http://resolver.tudelft.nl/uuid:ca68f483-16ba-4657-90b2-14beed27570c","Challenges in designing an inclusive Peer-to-peer (P2P) lending system","Sulastri, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Cid, David Duenas (editor)","2023","Literature suggests advantages of Peer-to-peer (P2P) lending systems over conventional banking credit, such as better credit scoring, and direct interaction of lenders-borrowers. Fintech P2P lending companies can process scattered individual information using advanced statistical methods and serve unreached market segments improving inclusiveness in society. Establishing inclusive P2P lending systems remains challenging, however, there is no systematic overview of such design challenges. Failure in designing an inclusive system creates a system that remains exclusive for some parts of society which hinders them from increasing economic transactions or even continuing business as usual due to limited funds. This research aims to identify the challenges in designing P2P lending systems that block inclusiveness in society. We conducted a systematic literature review followed by semi-structured interviews with financial inclusions and P2P lending systems experts. Our review found a variety of challenges in designing inclusive P2P lending systems. We classify the challenges into six categories. The main challenges are related to trust in the systems, literacy, and data issues.","","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:81f5aeed-3b68-4501-86cf-7de77748c6ca","http://resolver.tudelft.nl/uuid:81f5aeed-3b68-4501-86cf-7de77748c6ca","Corrigendum to ‘Put your money where your feet are: The real-world effects of StepBet gamified deposit contracts for physical activity’ [Internet Interv., volume 31, March 2023, 100610] (Internet Interventions (2023) 31, (S2214782923000106), (10.1016/j.invent.2023.100610))","de Buisonjé, David R. (Universiteit Leiden); Brosig, Fiona (Universiteit Leiden); Breeman, Linda D. (Universiteit Leiden); Bloom, Erika Litvin (WayBetter, Wilmington); Reijnders, T. (TU Delft Design Aesthetics; Universiteit Leiden); Janssen, Veronica R. (Universiteit Leiden; Leiden University Medical Center); Kraaijenhagen, Roderik A. (Hearts4people Foundation); Kemps, Hareld M.C. (Maxima Medical Center, Veldhoven; Eindhoven University of Technology); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden; Medical Delta)","","2023","The authors regret that the Standard Deviation (SD) for those who failed their challenge (n = 19,693) was erroneously reported in the Abstract (page 1) and Table 2 of the Results section (page 6) as 3013 steps. The correct Standard Deviation that should have been reported there is 2993 steps. Furthermore, in the Results section under header 3.3 Exploratory Analyses (page 6) we erroneously state that exploratory analyses were performed on a subsample of 29,001 participants. The correct number that should have been reported there is 29,002 participants. The authors would like to apologise for any inconvenience caused.","","en","journal article","","","","","","corrigendum voor DOI 10.1016/j.invent.2023.100610","","","","","Design Aesthetics","","",""
"uuid:fd7cc390-2df7-41e1-abf2-c09190b1b748","http://resolver.tudelft.nl/uuid:fd7cc390-2df7-41e1-abf2-c09190b1b748","A Survey on Approximate Edge AI for Energy Efficient Autonomous Driving Services","Katare, D. (TU Delft Information and Communication Technology); Perino, Diego (Telefonica Research); Nurmi, Jari (Tampere University); Warnier, Martijn (TU Delft Multi Actor Systems); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Ding, Aaron Yi (TU Delft Information and Communication Technology)","","2023","Autonomous driving services depends on active sensing from modules such as camera, LiDAR, radar, and communication units. Traditionally, these modules process the sensed data on high-performance computing units inside the vehicle, which can deploy intelligent algorithms and AI models. The sensors mentioned above can produce large volumes of data, potentially reaching up to 20 Terabytes. This data size is influenced by factors such as the duration of driving, the data rate, and the sensor specifications. Consequently, this substantial amount of data can lead to significant power consumption on the vehicle. Similarly, a substantial amount of data will be exchanged between infrastructure sensors and vehicles for collaborative vehicle applications or fully connected autonomous vehicles. This communication process generates an additional surge of energy consumption. Although the autonomous vehicle domain has seen advancements in sensory technologies, wireless communication, computing and AI/ML algorithms, the challenge still exists in how to apply and integrate these technology innovations to achieve energy efficiency. This survey reviews and compares the connected vehicular applications, vehicular communications, approximation and Edge AI techniques. The focus is on energy efficiency by covering newly proposed approximation and enabling frameworks. To the best of our knowledge, this survey is the first to review the latest approximate Edge AI frameworks and publicly available datasets in energy-efficient autonomous driving. The insights from this survey can benefit the collaborative driving service development on low-power and memory-constrained systems and the energy optimization of autonomous vehicles.","Artificial intelligence; Autonomous vehicles; Edge computing; Sensors; Simultaneous localization and mapping; Surveys; Vehicles","en","journal article","","","","","","","","","","Multi Actor Systems","Information and Communication Technology","","",""
"uuid:caadff0d-66d8-445a-98b3-0c19ad9f0366","http://resolver.tudelft.nl/uuid:caadff0d-66d8-445a-98b3-0c19ad9f0366","Driving and Inhibiting Factors for Implementing Audit Analytics in an Internal Audit Function","Ramadhan, M.G. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); van der Voort, H.G. (TU Delft Organisation & Governance)","","2023","Internal audit function (IAF) effectiveness can be improved by embracing Audit Analytics (AA). However, despite its promises, AA implementation remains limited. Although there is research on AA implementation in general, there needs to be an overview of insight into inhibiting and driving factors for internal auditing. This paper examines those driving and inhibiting factors by exploring the literature on AA implementation. The initial search revealed 98 uniquely identified papers. Further filtering and the additional search returned 42 articles, which were analyzed in detail. The analysis resulted in 12 driving and 23 inhibiting factors, grouped into internal, regulation, data, infrastructure, and audit practice categories. The literature shows that IAF encounters multiple and intertwined factors in AA implementation and needs to anticipate those factors. Moreover, AA implementation affects IAF’s parts and stakeholders differently, requiring internal and external collaboration. Building on these insights, we provide recommendations for further research.","audit analytics; driving factors; inhibiting factors; internal audit","en","journal article","","","","","","","","2024-01-27","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:af4e4bb3-8595-4fee-90a8-bee10a1ee275","http://resolver.tudelft.nl/uuid:af4e4bb3-8595-4fee-90a8-bee10a1ee275","Storing CO2 in geothermal reservoir rocks from the Kizildere field, Turkey: Combined stress, temperature, and pore fluid dependence of seismic properties","Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Barnhoorn, A. (TU Delft Applied Geophysics and Petrophysics); Wolf, K.H.A.A. (TU Delft Applied Geophysics and Petrophysics)","","2023","As part of a seismic monitoring project in a geothermal field, where the feasibility of re-injection and storage of produced CO2 is being investigated, a P- and S-wave seismic velocity characterisation study was carried out. The effect of axial and radial (up to 42 MPa) stress, pore pressure (up to 17 MPa), pore fluid (100% brine or supercritical CO2) and temperature (21–100 °C) on seismic properties were studied in the laboratory for the two main reservoir formations at the Kızıldere geothermal reservoir. Each (un)confined compressive strength test performed revealed a similar trend: rapidly increasing velocity at low stresses followed by a more moderate increase at higher stresses. The data implied that the stress-dependency of the velocity increased with temperature. Increasing temperatures resulted in decreasing P-wave velocities due to mineral thermal expansion. This temperature-dependency increased with reducing stress levels. The S-wave velocity seems to be more sensitive to changes in pore pressure than the P-wave velocity. On the other hand, the S-wave velocity is less affected by an increasing axial stress compared to the P-wave velocity. By performing multiple nonlinear regression on the velocity dataset, related to a brine-saturated fractured marble, second-degree polynomial trends were found for the P- and S-wave velocity, as a function of temperature, axial stress, and pore pressure, that can potentially be used for predicting velocities at Kızıldere, or other similar, geothermal site(s). For distinguishing between a 100% brine-saturated versus a fully supercritical CO2-saturated fracture, the arrival times of the first arrivals were too close to each other to allow their utilization. The fracture aperture was too small compared to the wavelength of the source signal. However, differences in P- and S-wave amplitudes of the first arrivals were seen, where the supercritical CO2-saturated crack revealed consistently lower peak and trough amplitudes compared to the brine-saturated scenario.","CO storage; Fracture permeability; Fractured reservoir; Geothermal energy; Rock mechanics; Seismic velocity","en","journal article","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:a07b18d6-e17b-4a4b-8358-048d225fb74c","http://resolver.tudelft.nl/uuid:a07b18d6-e17b-4a4b-8358-048d225fb74c","Challenges of urban digital twins: A systematic review and a Delphi expert survey","Lei, Binyu (National University of Singapore); Janssen, P.H.T. (National University of Singapore); Stoter, J.E. (TU Delft Urban Data Science); Biljecki, Filip (National University of Singapore)","","2023","Many challenges to operate digital twins remain, hindering their design and implementation, and are rarely discussed. Furthermore, issues of social and legal nature are often overlooked. We identify the challenges of operating digital twins in the urban context through a bifurcated and multi-dimensional approach: a systematic literature review and an expert survey. The review organises the identified challenges across technical and non-technical dimensions. As the topic is novel, the corpus is rather small and lacking the contextualisation of challenges. Thus, we complement it with a survey based on the Delphi method, involving a diverse panel of domain experts covering academia, industry and government organisations. Combining the results, we identify 14 technical and 9 non-technical challenges and map them to phases of the digital twin's life cycle. The most severe challenges appear to be related to interoperability (e.g. disparate semantic standards) and practical value (e.g. lack of business models).","3D city model; City information model; Simulations; Urban planning; Virtual replica","en","review","","","","","","","","","","","Urban Data Science","","",""
"uuid:a83f691c-15a3-43b5-83c5-911cd2fce4b7","http://resolver.tudelft.nl/uuid:a83f691c-15a3-43b5-83c5-911cd2fce4b7","Steering self-organisation through confinement","Araújo, Nuno A.M. (University of Lisbon); Janssen, Liesbeth M.C. (Eindhoven University of Technology); Barois, Thomas (University of Bordeaux); Boffetta, Guido (University of Turin); Cohen, Itai (Cornell University; Cornell University Laboratory of Atomic and Solid State Physics); Corbetta, Alessandro (Eindhoven University of Technology); Dauchot, Olivier (Université PSL); Dussutour, Audrey (Université de Toulouse); Koenderink, G.H. (TU Delft BN/Gijsje Koenderink Lab; Kavli institute of nanoscience Delft)","","2023","Self-organisation is the spontaneous emergence of spatio-temporal structures and patterns from the interaction of smaller individual units. Examples are found across many scales in very different systems and scientific disciplines, from physics, materials science and robotics to biology, geophysics and astronomy. Recent research has highlighted how self-organisation can be both mediated and controlled by confinement. Confinement is an action over a system that limits its units’ translational and rotational degrees of freedom, thus also influencing the system's phase space probability density; it can function as either a catalyst or inhibitor of self-organisation. Confinement can then become a means to actively steer the emergence or suppression of collective phenomena in space and time. Here, to provide a common framework and perspective for future research, we examine the role of confinement in the self-organisation of soft-matter systems and identify overarching scientific challenges that need to be addressed to harness its full scientific and technological potential in soft matter and related fields. By drawing analogies with other disciplines, this framework will accelerate a common deeper understanding of self-organisation and trigger the development of innovative strategies to steer it using confinement, with impact on, e.g., the design of smarter materials, tissue engineering for biomedicine and in guiding active matter.","","en","review","","","","","","","","","","","BN/Gijsje Koenderink Lab","","",""
"uuid:532b290e-a934-4f9d-b23a-a2c7578ecf75","http://resolver.tudelft.nl/uuid:532b290e-a934-4f9d-b23a-a2c7578ecf75","Understanding civil servants' intentions to open data: factors influencing behavior to disclose data","Kleiman, F. (TU Delft Transport and Logistics; TU Delft Information and Communication Technology); Jansen, S.J.T. (TU Delft Real Estate Management); Meijer, Sebastiaan (KTH Royal Institute of Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2023","Purpose: The opening of government data is high on the policy agenda of governments worldwide. However, data release faces barriers due to limited support of civil servants, whereas the literature neglects civil servants' role in opening data. This paper aims at understanding why civil servants can be reluctant to support the disclosure of data. The authors developed a model to explain civil servants' behavioral intention to open data. Design/methodology/approach: The authors test a series of hypotheses by collecting and analyzing survey data from 387 civil servants and by applying multivariate hierarchical regression. Findings: The results indicate the factors influencing the behavior of civil servants. Social influences, performance expectancy, data management knowledge and risks have a significant influence. Personal characteristics control these effects. Research limitations/implications: Caution is needed to generalize the findings towards the support to open data provision by civil servants. Though the analyzed sample was limited to Brazil, other countries and cultures might yield different outcomes. Larger and more diversified samples might indicate significant effects on variables not found in this research. Practical implications: The insights can be used to develop policies for increasing the support of civil servants towards governmental data disclosure. Originality/value: This study suggests factors of influence to civil servants' behavior intentions to disclose governmental data. It results in a model of factors, specifically for their behavioral intention at the individual level.","Adoption; Attitude; Barriers; Behavior; Learning; Open data; Open government","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-09-09","","Engineering, Systems and Services","Transport and Logistics","","",""
"uuid:dfafd525-7101-41ad-98cc-21512fca775e","http://resolver.tudelft.nl/uuid:dfafd525-7101-41ad-98cc-21512fca775e","Put your money where your feet are: The real-world effects of StepBet gamified deposit contracts for physical activity","de Buisonjé, David R. (Universiteit Leiden); Brosig, Fiona (Universiteit Leiden); Breeman, Linda D. (Universiteit Leiden); Bloom, Erika Litvin (WayBetter, Wilmington); Reijnders, T. (TU Delft Design Aesthetics; Universiteit Leiden); Janssen, Veronica R. (Universiteit Leiden; Leiden University Medical Center); Kraaijenhagen, Roderik A. (Hearts4people Foundation); Kemps, Hareld M.C. (Maxima Medical Center, Veldhoven; Eindhoven University of Technology); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden; Medical Delta)","","2023","Background: Gamification and deposit contracts (a financial incentive in which participants pledge their own money) can enhance effectiveness of mobile behavior change interventions. However, to assess their potential for improving population health, research should investigate implementation of gamified deposit contracts outside the research setting. Therefore, we analyzed data from StepBet, a smartphone application originally developed by WayBetter, Inc. Objective: To perform a naturalistic evaluation of StepBet gamified deposit contracts, for whom they work best, and under which conditions they are most effective to help increase physical activity. Methods: WayBetter provided data of StepBet participants that participated in a stepcount challenge between 2015 and 2020 (N = 72,974). StepBet challenges were offered on the StepBet smartphone application. The modal challenge consisted of a $40 deposit made prior to a 6-week challenge period during which participants needed to reach daily and weekly step goals in order to regain their deposit. Participants who met their goals also received additional earnings which were paid out from the money lost by those who failed their challenge. Challenge step goals were tailored on a 90-day historic step count retrieval that was also used as the baseline comparison for this study. Primary outcomes were increase in step count (continuous) and challenge success (dichotomous). Results: Overall, average daily step counts increased by 31.2 % (2423 steps, SD = 3462) from 7774 steps (SD = 3112) at baseline to 10,197 steps (SD = 4162) during the challenge. The average challenge success rate was 73 %. Those who succeeded in their challenge (n = 53,281) increased their step count by 44.0 % (3465 steps, SD = 3013), while those who failed their challenge (n = 19,693) decreased their step count by −5.3 % (−398 steps, SD = 3013). Challenges started as a New Year's resolution were slightly more successful (77.7 %) than those started during the rest of the year (72.6 %). Discussion: In a real-world setting, and among a large and diverse sample, participating in a gamified deposit contract challenge was associated with a large increase in step counts. A majority of challenges were successful and succeeding in a challenge was associated with a large and clinically relevant increase in step counts. Based on these findings, we recommend implementing gamified deposit contracts for physical activity where possible. An interesting avenue for future research is to explore possible setback effects among people who fail a challenge, and how setbacks can be mitigated. Pre-registration: Open Science Framework (doi:10.17605/OSF.IO/D237C).","Deposit contracts; Financial incentives; Gamification; Health behavior change; Physical activity","en","journal article","","","","","","Corrigendum DOI 10.1016/j.invent.2023.100626","","","","","Design Aesthetics","","",""
"uuid:5e049878-053c-4f59-b0db-cec1be8d7501","http://resolver.tudelft.nl/uuid:5e049878-053c-4f59-b0db-cec1be8d7501","Enhancing phosphorus removal of photogranules by incorporating polyphosphate accumulating organisms","Trebuch, Lukas M. (Netherlands Institute of Ecology; Wageningen University & Research); Sohier, Jasper (Netherlands Institute of Ecology); Altenburg, Sido (Netherlands Institute of Ecology); Oyserman, Ben O. (Netherlands Institute of Ecology; Wageningen University & Research); Pronk, M. (TU Delft BT/Environmental Biotechnology; Royal HaskoningDHV); Janssen, Marcel (Wageningen University & Research); Vet, Louise E.M. (Netherlands Institute of Ecology); Wijffels, René H. (Wageningen University & Research; Nord University); Fernandes, Tânia V. (Netherlands Institute of Ecology)","","2023","Photogranules are a novel wastewater treatment technology that can utilize the sun's energy to treat water with lower energy input and have great potential for nutrient recovery applications. They have been proven to efficiently remove nitrogen and carbon but show lower conversion rates for phosphorus compared to established treatment systems, such as aerobic granular sludge. In this study, we successfully introduced polyphosphate accumulating organisms (PAOs) to an established photogranular culture. We operated photobioreactors in sequencing batch mode with six cycles per day and alternating anaerobic (dark) and aerobic (light) phases. We were able to increase phosphorus removal/recovery by 6 times from 5.4 to 30 mg/L/d while maintaining similar nitrogen and carbon removal compared to photogranules without PAOs. To maintain PAOs activity, alternating anaerobic feast and aerobic famine conditions were required. In future applications, where aerobic conditions are dependent on in-situ oxygenation via photosynthesis, the process will rely on sunlight availability. Therefore, we investigated the feasibility of the process under diurnal cycles with a 12-h anaerobic phase during nighttime and six short cycles during the 12 h daytime. The 12-h anaerobic phase had no adverse effect on the PAOs and phototrophs. Due to the extension of one anaerobic phase to 12 h the six aerobic phases were shortened by 47% and consequently decreased the light hours per day. This resulted in a decrease of phototrophs, which reduced nitrogen removal and biomass productivity up to 30%. Finally, we discuss and suggest strategies to apply PAO-enriched photogranules at large-scale.","Aerobic granular sludge; Enhanced biological phosphorus removal (EBPR); Microalgal-bacterial granules; Microbial ecology; PhotoEBPR; Wastewater","en","journal article","","","","","","","","","","","BT/Environmental Biotechnology","","",""
"uuid:6709009f-29f3-4aed-ad40-c7390e4d229c","http://resolver.tudelft.nl/uuid:6709009f-29f3-4aed-ad40-c7390e4d229c","Decimeter Positioning in an Urban Environment Through a Scalable Optical-Wireless Network","Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Signal Processing Systems); Koelemeij, Jeroen (Vrije Universiteit Amsterdam); Dierikx, Erik (National Metrology Institute VSL); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning); Dun, H. (TU Delft Mathematical Geodesy and Positioning)","","2023","This paper presents a terrestrial networked positioning system that obtains a reliable time reference from a national time scale realization and distributes it in a prototype to six roadside base stations through a fiber-optic Gigabit Ethernet network. Wireless wideband signals are transmitted by the base stations, thereby enabling positioning by a mobile receiver with an accuracy of one decimeter in a multipath urban environment. The scalability and compatibility of this system with existing telecommunication-network technologies paves the way for wide-area global navigation satellite system-independent back-up systems for timing and positioning with improved coverage and performance. The results presented in this paper are based on research carried out within the scope of a project funded by the Dutch Research Council (NWO, project 13970).","optical synchronization; terrestrial PNT system; wideband radio ranging signal","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:63d7f97a-6172-47d4-a4ad-876884dc3c16","http://resolver.tudelft.nl/uuid:63d7f97a-6172-47d4-a4ad-876884dc3c16","Reinforcing data bias in crisis information management: The case of the Yemen humanitarian response","Paulus, D. (TU Delft Organisation & Governance); de Vries, G. (TU Delft Organisation & Governance); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Van de Walle, Bartel (United Nations University - Merit (UNU-MERIT))","","2023","The complex and uncertain environment of the humanitarian response to crises can lead to data bias, which can affect decision-making. Evidence of data bias in crisis information management (CIM) remains scattered despite its potentially significant impact on crisis response. To understand what biases emerge in complex crises and how they affect CIM, we conducted a combined interview and document analysis study. Focusing on the largest humanitarian crisis in the world, i.e., the conflict in Yemen, we conducted 25 interviews with managers and analysts of response organizations, and assessed 47 reports and datasets created by response organizations in Yemen. We find evidence of a cycle of bias reinforcement through which bias cascades between field, headquarters and donor levels of crisis response. Researchers, as well as practitioners, need to consider these underlying biases and reinforcement loops because they influence what data can be collected when, by whom, from whom, and how the data is shared and used. To the CIM literature, we contribute an in-depth understanding of how four types of data bias emerge in crises: political, accessibility, topical, and sampling bias.","Crisis information management; Data bias; Humanitarian response; Interviews, document analysis","en","journal article","","","","","","","","","","Engineering, Systems and Services","Organisation & Governance","","",""
"uuid:85165589-d66b-4e3d-9de2-a168a63646c5","http://resolver.tudelft.nl/uuid:85165589-d66b-4e3d-9de2-a168a63646c5","Formulating Open Data-Based Value Propositions: An Evaluation and Comparison of Two Canvas Tools","Clarinval, Antoine (University of Namur); Simonofski, Anthony (University of Namur); Castiaux, Annick (University of Namur); Gao, Yingying (Huazhong University of Science and Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Cid, David Duenas (editor)","2023","The publication of Open Government Data (OGD) is expected to deliver economic value creation through innovation. In any OGD-based value creation, it is essential to formulate a value proposition (VP). However, previous literature has devoted little attention to the tools that support the formulation of OGD-based VP, and none has evaluated the performance of such tools with OGD infomediaries. In this article, we evaluate and compare the Business Model Canvas (BMC) and the Open Data Canvas (ODC) performance in supporting the formulation of VP. Questionnaire feedback was obtained from infomediaries who formulated OGD-based VP using the BMC and the ODC. The results show a superiority of either the BMC or the ODC in terms of perceived usefulness, depending on the focus of the feasibility evaluation of the VP. The ODC provides OGD-specific guidance on evaluating technical feasibility while the BMC covers economic feasibility more extensively. We recommend investigating the emerging field of OGD-based VP formulation tools by replicating our research with other types of infomediaries, in other settings, and completing it with qualitative insights.","Business Model Canvas; Feasibility evaluation; Open Data Canvas; Open Government Data; Value proposition","en","conference paper","Association for Computing Machinery (ACM)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-01-11","","Engineering, Systems and Services","","","",""
"uuid:d03b2d8d-0458-42ba-bc7b-b48dfefe3988","http://resolver.tudelft.nl/uuid:d03b2d8d-0458-42ba-bc7b-b48dfefe3988","Policy guidelines to facilitate collective action towards quantum-safety: Recommended policy guidelines to aid and facilitate collective action in migration towards quantum-safe public key infrastructure systems","Christiansen, L.V.C. (TU Delft Information and Communication Technology); Bharosa, Nitesh (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","Cid, David Duenas (editor)","2023","As the development of quantum computers advances, actors relying on public key infrastructures (PKI) for secure information exchange are becoming aware of the disruptive implications. Currently, governments and businesses employ PKI for many core processes that may become insecure or unavailable when quantum computers break the cryptographic algorithms foundational to PKI. While standardization institutes are currently testing quantum safe cryptographic algorithms, there are no globally agreed-upon cryptographic solutions available. Actors looking to prepare for the implementation of quantum safe cryptographic algorithms lack methods that allow for collective planning and action across organizations, sectors, and nations. The goal of this policy paper is to elicit requirements for a serious game on QS PKI, and derive policy guidelines that actors can use to prepare and formulate governance arrangements. We followed a two-step approach, drawing on technology threat avoidance theory and collective action theory, followed by empirical grounding through a focus group. The results from the literature confirm that a serious game could be a suitable governance mechanism for QS PKI. The focus group results discussed 12 requirements and the requirement's relation to the theoretical background. From this, the findings section arrived at four policy guidelines derived from the requirements that can function as focus areas for further requirement development and as input for policy makers. The policy guidelines concluded are (1) prioritize increasing collective awareness through emphasizing social networks, (2) acknowledge the interdependencies in migrating towards QS PKI, (3) create an understanding of the technical standards in the field and their issuers, and (4) being highly realistic with both negative and positive scenarios to center the players' understanding of real-world impact.","Collective action; Cybersecurity; Policy; Quantum-Safe PKI; Serious Games","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:40471115-106c-4cd7-8e0b-917155dc1008","http://resolver.tudelft.nl/uuid:40471115-106c-4cd7-8e0b-917155dc1008","Analyzing Dependencies among Challenges for Quantum-safe Transition","Kong, I. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Bharosa, Nitesh (TU Delft Information and Communication Technology)","","2023","The quantum computing-based threats call for a critical information infrastructure to modify widely used cryptographic algorithms to ones that are quantum-safe (QS). Yet, little scholarly research has been undertaken to study QS transition, and the guidance to prepare for socio-technical predicaments of the transition falls short. To address the gaps, the paper aims to determine the contextual interaction between QS transition challenges and classify these challenges into driving power and dependency power. In doing so, we use an integrated Interpretive Structural Modelling (ISM)-Matrice d'Impacts Croisés Multiplication Appliqués à un Classement (MICMAC) approach. The results of ISM-MICMAC analysis indicate that the dominant challenges that organizations need to prioritize are establishing a clear QS transition governance and collaborations in the ecosystem. The findings show that it is crucial for organizations to understand the ecosystem making up the critical information infrastructure they are operating in and collaboratively navigate the action approaches for the QS transition. This also implies that preparation for the QS transition not only includes developing QS solution standards but also requires well-defined roles and responsibilities for various actors in the ecosystem.","ISM MICMAC analysis; Quantum-safe transition; Transition challenges","en","journal article","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:46b06f14-4d1f-4c08-881b-7aaf3788bb09","http://resolver.tudelft.nl/uuid:46b06f14-4d1f-4c08-881b-7aaf3788bb09","Cardiovascular disease patients’ views on using financial incentives for health behavior change: Are deposit contracts acceptable?","de Buisonjé, D. R. (Universiteit Leiden); Reijnders, T. (Universiteit Leiden); Cohen Rodrigues, T. R. (Universiteit Leiden); van den Broek, I. (Harteraad); Kraaijenhagen, R. A. (Hearts4people Foundation); Janssen, V. R. (Universiteit Leiden; Leiden University Medical Center); Kemps, H. M.C. (Maxima Medical Center, Veldhoven; Eindhoven University of Technology); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden; Medical Delta)","","2023","Background: There is an urgent need to find new approaches that improve long-term adherence to a healthy lifestyle for people with cardiovascular disease (CVD). Deposit contracts (a financial incentive in which the participant deposits own money) are inexpensive and effective, but acceptability among CVD patients is unclear. This study investigated the acceptability of a deposit contract intervention for physical activity among CVD patients. Methods: We approached CVD patients through the Harteraad patient panel of the Dutch CVD patient organization and asked them to fill in an online survey. In total (N = 659) CVD patients with a mean age of 66.2 years completed the survey. The survey assessed acceptability of deposit contracts, responses to a concrete example of a deposit contract for physical activity behavior change, and suitable moments for implementation. Results: Overall, half of the participants (45.6%) confirmed needing extra commitment to maintain lifestyle change. Yet, a small part of the sample was convinced by the idea that losing money could be motivating (18.8%) and indicated that they would be willing to deposit money themselves (13.2%). Responding to a concrete example of a deposit contract for physical activity, a quarter of the sample (26.2%) reported there was a chance they would participate. Furthermore, 27.1% of the participants found the deposit contract effective and 27.4% found it acceptable. Exploratory analyses showed that a subgroup of younger and lower educated participants responded more favorably. Opinions on when to start with a deposit contract were mixed. Conclusions: Because acceptability was generally found to be low, future research should also investigate strategies to leverage commitment principles for CVD patients without a cash deposit requirement. When deposit contracts are offered to CVD patients in practice, we recommend offering them as an optional, additional element to existing interventions that patients can opt-in to.","Cardiac rehabilitation; Cardiovascular disease; CVD; Deposit contracts; Financial incentives; Healthy lifestyle","en","journal article","","","","","","","","","","","Applied Ergonomics and Design","","",""
"uuid:bdd9ed1d-918e-4335-8ebe-aacaab11f476","http://resolver.tudelft.nl/uuid:bdd9ed1d-918e-4335-8ebe-aacaab11f476","Digital transparency and the usefulness for open government","Matheus, R. (TU Delft Information and Communication Technology); Faber, R.M. (TU Delft Transport and Logistics); Ismagilova, Elvira (Bradford University); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2023","Open Government efforts are criticized for providing limited value. Instead of looking at a value, we investigate the usefulness of web-based open government portals and apps. Specifically, we investigated the relationship between digital transparency and usefulness. We analyzed perceived digital transparency and usefulness in a survey of 112 respondents using Partial Least Square (PLS) and Structural Equation Modelling (SEM). The results show that perceived functionality, transparency, and efficiency influence usefulness but that functionality of apps and efficiency are more important than transparency. Usefulness can be created without having high levels of transparency, as the public wants answers to their questions. Apps should be designed for efficient use, as users have limited time and resources. Apps having pre-defined functional views can be useful to provide quick insight but might limit transparency by not offering other views and insights. Opening raw data using portals can provide higher levels of transparency, although more time and effort are needed to analyze. Both portals providing access to raw data and apps having pre-defined views are needed for open government and transparency as they serve other stakeholder groups and purposes.","App design; Digital transparency; Open data; Open government; Partial least square (PLS); Structural equation modelling (SEM); Transparency; Websites","en","journal article","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:1eca0f5c-fcd2-4a92-ac7e-d4da893a9999","http://resolver.tudelft.nl/uuid:1eca0f5c-fcd2-4a92-ac7e-d4da893a9999","Identifying barriers and facilitators to adopting healthier dietary choices in clinical care: a cross-sectional observational study","de Frel, Daan L. (Leiden University Medical Center); Wicks, Hope (Leiden University Medical Center); Bakk, Zsuzsa (Universiteit Leiden); van Keulen, Nicole (Leiden University Medical Center); Atsma, D.E. (TU Delft Methodologie en Organisatie van Design; Leiden University Medical Center; Universiteit Leiden); Janssen, Veronica R. (Leiden University Medical Center)","","2023","Background and aims: Adopting healthier diets can drastically improve societal health. Our environment plays a crucial role in daily dietary choices and hospitals in particular can stimulate patients to adopt healthier eating habits. Unfortunately, no robust clinically applicable cuing tools exist to help guide in-hospital dietary interventions. The purpose of this study was to identify patient-related barriers and facilitators to adopting healthier dietary choices. Methods and results: This cross-sectional observational study was conducted on the cardiology ward of a university medical center between June 2020 and January 2021. Of the 594 patients asked and the 312 completed surveys on healthy eating intentions, 285 responses were considered for analysis. Notably, the majority of respondents were male (68.8%), with an average hospital stay of 3.3 days. The results indicate that cardiac patients attribute significantly greater influence on their dietary behavior to doctors compared to other caregivers, including dieticians (X2 = 37.09, df = 9, p < 0.001). Also, younger patients (below 70 years of age) were more inclined to plan changing dietary behavior than older patients. Most mentioned facilitators for adopting a healthier diet were more information/counseling, help in preparing food, support from family and friends, and more emphasis from a doctor. Conclusion: The study highlights the importance of involving doctors in formulating dietary policies and patient-directed interventions within hospital settings. It also sheds light on the barriers and facilitators for promoting healthier dietary behaviors among patients during their hospitalization.","cardiovascular disease; choice behavior; healthy diet; nudge; teachable moment","en","journal article","","","","","","","","","","","Methodologie en Organisatie van Design","","",""
"uuid:c3d46b1b-0815-47dd-a607-3cd56f977268","http://resolver.tudelft.nl/uuid:c3d46b1b-0815-47dd-a607-3cd56f977268","Advecting Superspecies: Efficiently Modeling Transport of Organic Aerosol With a Mass-Conserving Dimensionality Reduction Method","Sturm, Patrick Obin (University of California; Student TU Delft); Manders, Astrid (DIANA FEA); Janssen, Ruud (DIANA FEA); Segers, Arjo (DIANA FEA); Wexler, Anthony S. (University of California); Lin, H.X. (TU Delft Mathematical Physics; Universiteit Leiden)","","2023","The chemical transport model LOTOS-EUROS uses a volatility basis set (VBS) approach to represent the formation of secondary organic aerosol (SOA) in the atmosphere. Inclusion of the VBS approximately doubles the dimensionality of LOTOS-EUROS and slows computation of the advection operator by a factor of two. This complexity limits SOA representation in operational forecasts. We develop a mass-conserving dimensionality reduction method based on matrix factorization to find latent patterns in the VBS tracers that correspond to a smaller set of superspecies. Tracers are reversibly compressed to superspecies before transport, and the superspecies are subsequently decompressed to tracers for process-based SOA modeling. This physically interpretable data-driven method conserves the total concentration and phase of the tracers throughout the process. The superspecies approach is implemented in LOTOS-EUROS and found to accelerate the advection operator by a factor of 1.5–1.8. Concentrations remain numerically stable over model simulation times of 2 weeks, including simulations at higher spatial resolutions than the data-driven models were trained on. The reversible compression of VBS tracers enables detailed, process-based SOA representation in LOTOS-EUROS operational forecasts in a computationally efficient manner. Beyond this case study, the physically consistent data-driven approach developed in this work enforces conservation laws that are essential to other Earth system modeling applications, and generalizes to other processes where computational benefit can be gained from a two-way mapping between detailed process variables and their representation in a reduced-dimensional space.","advection; atmospheric composition; chemical transport modeling; dimensionality reduction; machine learning; organic aerosol","en","journal article","","","","","","","","","","","Mathematical Physics","","",""
"uuid:909f8e6d-12f4-4243-9e36-2dcb8bdf8acf","http://resolver.tudelft.nl/uuid:909f8e6d-12f4-4243-9e36-2dcb8bdf8acf","“Gebiedsontwikkeling is meer dan alleen fysieke verbetering”","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2023","Céline Janssen kijkt voor haar promotieonderzoek regelmatig over de grens. Haar interesse: de sociale duurzaamheid bij de aanpak van bestaande wijken. Dit keer zijn we in Zweden, projectmanager Samir Kafedzic belicht de integrale aanpak in Drottninghög","","en","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:6d3b105f-c5f5-49a5-8df4-899d9488ce52","http://resolver.tudelft.nl/uuid:6d3b105f-c5f5-49a5-8df4-899d9488ce52","Public participation in mission-oriented innovation projects","Wiarda, M.J. (TU Delft Economics of Technology and Innovation); Sobota, V.C.M. (TU Delft Economics of Technology and Innovation); Janssen, Matthijs J. (Universiteit Utrecht); van de Kaa, G. (TU Delft Economics of Technology and Innovation); Yaghmaei, E. (TU Delft Ethics & Philosophy of Technology); Doorn, N. (TU Delft Ethics & Philosophy of Technology)","","2023","Mission-oriented innovation policy is currently gaining renewed interest as an approach for addressing societal challenges. One of the promises is that missions can mobilise and align diverse stakeholders around a shared goal. Recent literature underlines the importance of public participation (e.g. municipalities and civil society organisations) in the socioeconomic transformations required for attaining missions. We ask how public participation differs among (non-)mission-oriented innovation projects. Drawing on a database containing Dutch government-funded innovation projects, we investigate whether mission-oriented projects are associated with earlier, more open, and more influential forms of public participation than conventional projects. Although the results suggest that mission-oriented projects indeed correspond with earlier participation of more public actors, we find little evidence that they also coincide with increased diversity and financial influence of public participants. We conclude by discussing how policymakers and intermediaries may engage in strategies to make missions more inclusive.","mission-oriented policy; challenge-led policy; Innovation policy; wicked problems; public participation; responsible innovation; societal challenges","en","journal article","","","","","","","","","","","Economics of Technology and Innovation","","",""
"uuid:1435f52e-84dd-49cb-8291-84b52b77d78b","http://resolver.tudelft.nl/uuid:1435f52e-84dd-49cb-8291-84b52b77d78b","Ontwikkelen in NYC is extreem, maar daardoor juist ook leerzaam","Janssen, C. (TU Delft Practice Chair Urban Area Development); Daamen, T.A. (TU Delft Urban Development Management); Heurkens, E.W.T.M. (TU Delft Urban Development Management)","","2024","Najaar 2023 gingen 20 professionals uit de Nederlandse ruimtelijke ontwikkelingspraktijk op studiereis naar New York. Een geliefde stad voor een onvergetelijke citytrip, maar wat levert zo’n studiereis op aan nieuwe inzichten voor gebiedsontwikkeling? Céline Janssen, Erwin Heurkens en Tom Daamen doen verslag.","international comparative research; gebiedsontwikkeling; lesson-drawing; New York","nl","report","Gebiedsontwikkeling.nu","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:abbee81c-8047-420c-9684-3b666ee5dd48","http://resolver.tudelft.nl/uuid:abbee81c-8047-420c-9684-3b666ee5dd48","Fracture Mechanics: An Engineering Primer","Janssen, M. (TU Delft Team Vera Popovich); Zuidema, J; Wanhill, R.J.H. (Royal Netherlands Aerospace Centre NLR)","","2024","In this second edition, which is the result of numerous revisions, updates and additions, the authors cover the basic concepts of fracture mechanics for both the linear elastic and elastic-plastic regimes. The fracture mechanics parameters K, G, J and CTOD are treated in a basic manner along with the test methods to determine critical values. The development of failure assessment based on elastic-plastic fracture mechanics is reflected in a comprehensive treatment.
Three chapters are devoted to the fracture mechanics characterisation of crack growth. Fatigue crack growth is extensively treated and attention is paid to the important topic of the initiation and growth of short fatigue cracks. Furthermore, sustained load fracture and dynamic crack growth are discussed, including various test techniques, e.g. the determination of the crack arrest toughness.
Finally, there are two chapters dealing with mechanisms of fracture and the ways in which actual material behaviour influences the fracture mechanics characterisation of crack growth. This textbook is intended primarily for engineering students. It will be useful to practising engineers as well, since it provides the background to several test and design methods and to criteria for material selection.","Fracture Mechanisms; Fracture Toughness; Failure Assessment; Fatigue; Sustained Load Fracture","en","book","TU Delft OPEN","978-94-6366-817-0","","","","","","","","","Team Vera Popovich","","",""
"uuid:e316ce2d-d063-4e7b-a686-0c74d3b4905a","http://resolver.tudelft.nl/uuid:e316ce2d-d063-4e7b-a686-0c74d3b4905a","Multi-Sensor Seismic Processing Approach using Geophones and HWC DAS in the Monitoring of CO2 Storage at the Hellisheiði Geothermal Field in Iceland","Bellezza, Cinzia (OGS-National Institute of Oceanography and Applied Geophysics–); Barison, Erika (OGS-National Institute of Oceanography and Applied Geophysics–); Farina, Biancamaria (OGS-National Institute of Oceanography and Applied Geophysics–); Poletto, Flavio (OGS-National Institute of Oceanography and Applied Geophysics–); Meneghini, Fabio (OGS-National Institute of Oceanography and Applied Geophysics–); Böhm, Gualtiero (OGS-National Institute of Oceanography and Applied Geophysics–); Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics); Janssen, M.T.G. (TU Delft Applied Geophysics and Petrophysics); van Otten, Gijs (Seismic Mechatronics BV)","","2024","Geothermal power production may result in significant CO2 emissions as part of the produced steam. CO2 capture, utilisation, subsurface storage (CCUS) and developments to exploit geothermal resources are focal points for future clean and renewable energy strategies. The Synergetic Utilisation of CO2 Storage Coupled with Geothermal Energy Deployment (SUCCEED) project aims to demonstrate the feasibility of using produced CO2 for re-injection in the geothermal field to improve geothermal performance, while also storing the CO2 as an action for climate change mitigation. Our study has the aim to develop innovative reservoir-monitoring technologies via active-source seismic data acquisition using a novel electric seismic vibrator source and permanently installed helically wound cable (HWC) fibre-optic distributed acoustic sensing (DAS) system. Implemented together with auxiliary multi-component (3C and 2C) geophone receiver arrays, this approach gave us the opportunity to compare and cross-validate the results using wavefields from different acquisition systems. We present the results of the baseline survey of a time-lapse monitoring project at the Hellisheiði geothermal field in Iceland. We perform tomographic inversion and multichannel seismic processing to investigate both the shallower and the deeper basaltic rocks targets. The wavefield analysis is supported by seismic modelling. The HWC DAS and the geophone-stacked sections show good consistency, highlighting the same reflection zones. The comparison of the new DAS technology with the well-known standard geophone acquisition proves the effectiveness and reliability of using broadside sensitivity HWC DAS in surface monitoring applications.","CO2 injection monitoring; geothermal reservoir; CCUS; surface seismic processing; distributed acoustic sensing (DAS); geophones","en","journal article","","","","","","","","","","","Applied Geophysics and Petrophysics","","",""
"uuid:db28aa9c-6a1b-4b1b-94e9-9e4257febb86","http://resolver.tudelft.nl/uuid:db28aa9c-6a1b-4b1b-94e9-9e4257febb86","Are men from Mars, women from Venus? Investigating the determinants behind the intention to use fully automated taxis","Zhu, Yonghan (Southwest University of Political Science and Law); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Pu, Chengyan (Zhejiang University)","","2024","Acceptance by customers is key to the success of shared autonomous vehicles (SAVs). However, only a small group of early technology-savvy customers currently use such vehicles, while the general population does not. Based on the Unified Theory of Acceptance and Use of Technology, Theory of Perceived Risk, and perceived threat of unemployment combined with knowledge of automated vehicles, this research develops an integrated model to investigate the determinants behind the intention to use fully automated taxis. Furthermore, it tested the differences between gender. Through the analysis of 539 samples, the findings showed that performance expectancy, effort expectancy, social influence, and knowledge of automated vehicles positively influence acceptance intention, while perceived safety risk and the perceived threat of unemployment were negatively related to behavioral intention. Moreover, effort expectancy, social influence, and perceived safety risk showed greater influence on females, while knowledge of automated vehicles exerted stronger effects on males.","Fully automated taxi; Gender differences; SAV acceptance; TPR; UTAUT","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-07-30","","Engineering, Systems and Services","","","",""
"uuid:d909f711-a050-44d1-9b24-de97a94eaa1b","http://resolver.tudelft.nl/uuid:d909f711-a050-44d1-9b24-de97a94eaa1b","Governing capabilities, not places – how to understand social sustainability implementation in urban development","Janssen, C. (TU Delft Practice Chair Urban Area Development); Daamen, T.A. (TU Delft Urban Development Management); Verheul, W.J. (TU Delft Urban Development Management)","","2024","Social sustainability’s implementation in urban development is a complex endeavour that demands alternative forms of governance. This article draws on the capabilities approach as an evaluative framework to better understand this implementation process. Through an in-depth case comparison of two Dutch urban development projects, the study analyses how collaborative governance situations (i.e. actors, activities and phases) relate to the expansions of resident capabilities in the urban areas. The findings present three principles for a ‘capability-centred governance’ of social sustainability in urban development: (1) integrate human logic into urban governance situations (2) balance strong goal commitment with experimentalist approaches and (3) institutionalise social sustainability implementation. The article concludes that social sustainability’s implementation requires a conceptualisation in which improvements in people’s lives are not seen as the self-evident consequences of a set of place-based policy interventions, but instead as a guiding principle that should continuously be reflected upon and learned from during the different phases of urban development processes.","capabilities approach; collaborative governance; policy implementation; social sustainability; urban development projects","en","journal article","","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:6c851b17-4bde-48d5-84f4-b43220d9c3dc","http://resolver.tudelft.nl/uuid:6c851b17-4bde-48d5-84f4-b43220d9c3dc","Less stick more carrot? Increasing the uptake of deposit contract financial incentives for physical activity: A randomized controlled trial","de Buisonjé, David R. (Universiteit Leiden); Reijnders, T. (TU Delft Design Aesthetics; Universiteit Leiden); Cohen Rodrigues, Talia R. (Universiteit Leiden); Santhanam, Prabhakaran (ETH Zürich); Kowatsch, Tobias (ETH Zürich; University of Zürich; University of St. Gallen); Breeman, Linda D. (Universiteit Leiden); Janssen, Veronica R. (Universiteit Leiden; Leiden University Medical Center); Kraaijenhagen, Roderik A. (Hearts4people Foundation); Kemps, Hareld M.C. (Maxima Medical Center, Veldhoven; Eindhoven University of Technology); Evers, A.W.M. (TU Delft Applied Ergonomics and Design; Universiteit Leiden; Erasmus Universiteit Rotterdam)","","2024","Background: Financial incentives are a promising tool to help people increase their physical activity, but they are expensive to provide. Deposit contracts are a type of financial incentive in which participants pledge their own money. However, low uptake is a crucial obstacle to the large-scale implementation of deposit contracts. Therefore, we investigated whether (1) matching the deposit 1:1 (doubling what is deposited) and (2) allowing for customizable deposit amounts increased the uptake and short term effectiveness of a deposit contract for physical activity. Methods: In this randomized controlled trial, 137 healthy students (age M = 21.6 years) downloaded a smartphone app that provided them with a tailored step goal and then randomized them to one of four experimental conditions. The deposit contract required either a €10 fixed deposit or a customizable deposit with any amount between €1 and €20 upfront. Furthermore, the deposit was either not matched or 1:1 matched (doubled) with a reward provided by the experiment. During 20 intervention days, daily feedback on goal progress and incentive earnings was provided by the app. We investigated effects on the uptake (measured as agreeing to participate and paying the deposit) and effectiveness of behavioral adoption (measured as participant days goal achieved). Findings: Overall, the uptake of deposit contracts was 83.2%, and participants (n = 113) achieved 14.9 out of 20 daily step goals. A binary logistic regression showed that uptake odds were 4.08 times higher when a deposit was matched (p = .010) compared to when it was not matched. Furthermore, uptake odds were 3.53 times higher when a deposit was customizable (p = .022) compared to when it was fixed. Two-way ANCOVA showed that matching (p = .752) and customization (p = .143) did not impact intervention effectiveness. However, we did find a marginally significant interaction effect of deposit matching X deposit customization (p = .063, ηp2 = 0.032). Customization decreased effectiveness when deposits were not matched (p = .033, ηp2 = 0.089), but had no effect when deposits were matched (p = .776, ηp2 = 0.001). Conclusions: We provide the first experimental evidence that both matching and customization increase the uptake of a deposit contract for physical activity. We recommend considering both matching and customization to overcome lack of uptake, with a preference for customization since matching a deposit imposes significant additional costs. However, since we found indications that customizable deposits might reduce effectiveness (when the deposits are not matched), we urge for more research on the effectiveness of customizable deposit contracts. Finally, future research should investigate which participant characteristics are predictive of deposit contract uptake and effectiveness. Pre-registration: OSF Registries, https://osf.io/cgq48.","Behavior change; Deposit contracts; eHealth; Financial incentives; Physical activity; Rewards","en","journal article","","","","","","","","","","","Design Aesthetics","","",""
"uuid:fb2f1a1a-7550-4d59-ba3b-6ef61ccab032","http://resolver.tudelft.nl/uuid:fb2f1a1a-7550-4d59-ba3b-6ef61ccab032","Identifying patterns and recommendations of and for sustainable open data initiatives: A benchmarking-driven analysis of open government data initiatives among European countries","Lnenicka, Martin (University of Pardubice); Nikiforova, Anastasija (University of Tartu); Luterek, Mariusz (University of Warsaw); Milic, Petar (University of Pristina); Rudmark, Daniel (University of Gothenburg; Swedish National Road and Transport Research Institute); Neumaier, Sebastian (St. Pölten University of Applied Sciences); Santoro, C. (TU Delft Information and Communication Technology; Katholieke Universiteit Leuven); Casiano Flores, Cesar (University of Twente); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Rodríguez Bolívar, Manuel Pedro (Universidad de Granada)","","2024","Open government and open (government) data are seen as tools to create new opportunities, eliminate or at least reduce information inequalities and improve public services. More than a decade of these efforts has provided much experience, practices, and perspectives to learn how to better deal with them. This paper focuses on benchmarking of open data initiatives over the years and attempts to identify patterns observed among European countries that could lead to disparities in the development, growth, and sustainability of open data ecosystems. To do this, we studied benchmarks and indices published over the last years (57 editions of 8 artifacts) and conducted a comparative case study of eight European countries, identifying patterns among them considering different potentially relevant contexts such as e-government, open government data, open data indices and rankings, and others relevant for the country under consideration. Using a Delphi method, we reached a consensus within a panel of experts and validated a final list of 94 patterns, including their frequency of occurrence among studied countries and their effects on the respective countries. Finally, we took a closer look at the developments in identified contexts over the years and defined 21 recommendations for more resilient and sustainable open government data initiatives and ecosystems and future steps in this area.","Benchmarking; Cluster analysis; Delphi method; E-government; Open data; Open data initiative; Pattern","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-06-08","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:c7ecc30c-ae74-427f-a26d-628a78fc092c","http://resolver.tudelft.nl/uuid:c7ecc30c-ae74-427f-a26d-628a78fc092c","Orienting undirected phylogenetic networks","Huber, Katharina T. (University of East Anglia); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, R. (TU Delft Discrete Mathematics and Optimization); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Moulton, V.L. (TU Delft Discrete Mathematics and Optimization; University of East Anglia); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization); Semple, Charles (University of Canterbury)","","2024","This paper studies the relationship between undirected (unrooted) and directed (rooted) phylogenetic networks. We describe a polynomial-time algorithm for deciding whether an undirected nonbinary phylogenetic network, given the locations of the root and reticulation vertices, can be oriented as a directed nonbinary phylogenetic network. Moreover, we characterize when this is possible and show that, in such instances, the resulting directed nonbinary phylogenetic network is unique. In addition, without being given the location of the root and the reticulation vertices, we describe an algorithm for deciding whether an undirected binary phylogenetic network N can be oriented as a directed binary phylogenetic network of a certain class. The algorithm is fixed-parameter tractable (FPT) when the parameter is the level of N and is applicable to classes of directed phylogenetic networks that satisfy certain conditions. As an example, we show that the well-studied class of binary tree-child networks satisfies these conditions.","Characterization; Computational biology; Fixed-parameter tractability; Graph algorithm; Graph orientation; Phylogenetic network; Phylogenetics; Polynomial-time algorithm","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:a31094c4-6d91-4832-a6a5-394afe6ae3a4","http://resolver.tudelft.nl/uuid:a31094c4-6d91-4832-a6a5-394afe6ae3a4","Realizing quantum-safe information sharing: Implementation and adoption challenges and policy recommendations for quantum-safe transitions","Kong, I. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services); Bharosa, Nitesh (TU Delft Information and Communication Technology)","","2024","By utilizing the properties of quantum mechanics, quantum computers have the potential to factor a key pair of a large prime number and break some of the core cryptographic primitives that most information infrastructures depend on. This means that today's widely used cryptographic algorithms can soon become unsafe and need to be modified with quantum-safe (QS) cryptography. While much work is still needed in developing QS cryptographic algorithms, the institutional, organizational, and policy aspects of transitioning the current infrastructures have received less attention. This paper provides an empirical analysis of QS transition challenges and policy recommendations for moving to a QS situation. We analyzed the data collected through interviews with experts and practitioners from the Dutch government. The results reveal that institutional, organizational and policy aspects of QS transitions are interconnected, and solutions for QS transitions are scattered. Consequently, organizations may face a Catch-22 loop without further actionable approaches and planning for QS transitions.","Adoption; Digital government; Implementation; Information infrastructures; Information sharing; Policy recommendations; Post-quantum cryptography; Quantum-safe transition","en","journal article","","","","","","","","","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:53f5717c-d13d-4b44-a7da-498d6d2b7c6d","http://resolver.tudelft.nl/uuid:53f5717c-d13d-4b44-a7da-498d6d2b7c6d","A near-linear kernel for bounded-state parsimony distance","Deen, Elise (Student TU Delft); van Iersel, L.J.J. (TU Delft Discrete Mathematics and Optimization); Janssen, Remie (Rijksinstituut voor Volksgezondheid en Milieu (RIVM)); Jones, M.E.L. (TU Delft Discrete Mathematics and Optimization); Murakami, Yukihiro (TU Delft Discrete Mathematics and Optimization); Zeh, Norbert (Dalhousie University)","","2024","The maximum parsimony distance dMP(T1,T2) and the bounded-state maximum parsimony distance dMPt(T1,T2) measure the difference between two phylogenetic trees T1,T2 in terms of the maximum difference between their parsimony scores for any character (with t a bound on the number of states in the character, in the case of dMPt(T1,T2)). While computing dMP(T1,T2) was previously shown to be fixed-parameter tractable with a linear kernel, no such result was known for dMPt(T1,T2). In this paper, we prove that computing dMPt(T1,T2) is fixed-parameter tractable for all t. Specifically, we prove that this problem has a kernel of size O(klgk), where k=dMPt(T1,T2). As the primary analysis tool, we introduce the concept of leg-disjoint incompatible quartets, which may be of independent interest.","Distance measure; Kernelization; Maximum parsimony distance; Parameterized complexity; Parsimony; Phylogenetic tree; Phylogenetics","en","journal article","","","","","","","","","","","Discrete Mathematics and Optimization","","",""
"uuid:1451be4e-fb3b-4bf3-b3d6-8957edc50a01","http://resolver.tudelft.nl/uuid:1451be4e-fb3b-4bf3-b3d6-8957edc50a01","How do system and user characteristics, along with anthropomorphism, impact cognitive absorption of chatbots – Introducing SUCCAST through a mixed methods study","Sarraf, Shagun (Indian Institute of Technology Delhi); Kar, Arpan Kumar (Indian Institute of Technology Delhi); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2024","Chatbots are radically redefining the customer service landscape. With the advent of AI-enabled chatbots, like ChatGPT, organizations are adopting chatbots to provide better customer services; however, the user experience has been given less attention. Building on IS success model and cognitive absorption theory, we posit that system and user characteristics enhance cognitive absorption amongst users, such that the relationship varies between anthropomorphic (e.g., human-like) and non-anthropomorphic chatbots. We undertook a cross-sectional comparative study, which was analyzed using PLS-SEM and fsQCA. Where PLS-SEM provided limited inferential insights about the differences between anthropomorphic and non-anthropomorphic chatbots, the FsQCA analysis resulted in three configurations of attributes for non-anthropomorphic and two configurations for anthropomorphic chatbots, which lead to higher cognitive absorption. The findings extend the existing literature, suggesting that anthropomorphic and non-anthropomorphic chatbots impact cognitive absorption through separate system and user characteristics configurations.","Anthropomorphism; Artificial intelligence; Chatbots; Cognitive absorption; Generative artificial intelligence; Qualitative comparative analysis","en","journal article","","","","","","","","","","Engineering, Systems and Services","","","",""
"uuid:97830b21-60d2-48bf-81c5-02112c1348c6","http://resolver.tudelft.nl/uuid:97830b21-60d2-48bf-81c5-02112c1348c6","Responsible mission governance: An integrative framework and research agenda","Wiarda, M.J. (TU Delft Values Technology and Innovation); Janssen, Matthijs J. (Universiteit Utrecht); Coenen, Tom B.J. (University of Twente); Doorn, N. (TU Delft Values Technology and Innovation)","","2024","Governance lies at the heart of instigating, steering, and creating the conditions for mission-oriented transitions that potentially help resolve some of our grand societal challenges. In doing so, policymakers will need to navigate both epistemic and normative considerations to develop, implement, and evaluate missions responsibly. A number of scholars have therefore expressed the need for a better conceptualization of responsible mission governance as a procedural approach, particularly with the aim of coping with the complexity, uncertainty, and contestation that render these wicked problems intractable. In this paper we develop an integrative framework for responsible mission governance by taking wickedness dimensions as our entry point. Accordingly, we argue that responsible mission governance should integrate various complementary governance responsibilities (e.g., reflexivity) and modes (e.g., reflexive governance) that potentially improve the effectiveness and desirability of missions.","Innovation policy; Mission; Responsible innovation; Societal challenge; Transformation; Transition","en","journal article","","","","","","","","","","Values Technology and Innovation","","","",""
"uuid:08752acf-f898-4c41-ae7b-966f3a8fa17d","http://resolver.tudelft.nl/uuid:08752acf-f898-4c41-ae7b-966f3a8fa17d","The conflicting geographies of social frontiers: Exploring the asymmetric impacts of social frontiers on household mobility in Rotterdam","Olner, Dan (University of Sheffield); Pryce, Gwilym (University of Sheffield); van Ham, M. (TU Delft Urbanism); Janssen, H.J. (TU Delft Urban Studies)","","2024","Social frontiers arise when there are sharp differences in the demographic composition of adjacent communities. This paper provides the first quantitative study of their impact on household mobility. We hypothesise that conflicting forces of white flight and territorial allegiance lead to asymmetrical effects, impacting residents on one side of the frontier more than the other due to differences in the range of housing options available to different groups, and different symbolic interpretations of the frontier. Using Dutch registry data for the city of Rotterdam we identify ethnic social frontier locations using a Bayesian spatial model (Dean et al., 2019), exploiting the data’s one hundred metre resolution to estimate frontiers at a very small spatial scale. Regression analysis of moving decisions finds that the ethnic asymmetry of the frontier matters more than ethnicity of individual households. On the ethnic minority side of the frontier, households of all ethnicities in the 28–37 age range have reduced probability of moving compared to non-frontier parts of the city. The opposite is true on the Dutch native side of the frontier. We supplement this analysis with flow models which again find strong frontier effects. Our findings illustrate how the study of social frontiers can shed light on local population dynamics and neighbourhood change.","geographical mobility; immigration; Netherlands; segregation; Social frontiers","en","journal article","","","","","","","","","","Urbanism","Urban Studies","","",""
"uuid:8e37b9b1-c3ab-4c93-b6d3-1c93ed4742b5","http://resolver.tudelft.nl/uuid:8e37b9b1-c3ab-4c93-b6d3-1c93ed4742b5","Understanding people-centered planning practice in Europe: An institutionalist comparison between urban development projects in Vienna and Helsingborg","Janssen, C. (TU Delft Practice Chair Urban Area Development)","","2024","Pursuing people-centered planning practices (PCPs) such as participatory approaches demands a better understanding of how their operationalization relates to contextual structures and conditions in urban governance. By comparing two cases of social sustainability operationalization in Austrian and Swedish urban development projects based on Ostrom’s IAD-framework, this article identifies institutions relating to performed people-centered activities. The findings reveal that PCPs do not necessarily benefit from highly formalized rules prescribing specific localized activities. Instead, they are shaped by institutions that (1) position the actors responsible for performing people-centered activities, (2) define strong socially-oriented and innovation-oriented outcomes, and (3) enable funding that upholds long-term public interests within the markets that co-shape the projects.","IAD framework; urban development project; localism; people-centered; social sustainability; participatory planning","en","journal article","","","","","","","","","","","Practice Chair Urban Area Development","","",""
"uuid:3abe64b4-8a0a-4f2a-ae47-679c9294e659","http://resolver.tudelft.nl/uuid:3abe64b4-8a0a-4f2a-ae47-679c9294e659","Are creative users more apt in reusing and adopting Open Government Data (OGD)? Gender differences","Alexopoulos, Charalampos (University of the Aegean); Saxena, Stuti (Graphic Era University); Rizun, Nina (Politechnika Gdanska); Matheus, R. (TU Delft Information and Communication Technology); Janssen, M.F.W.H.A. (TU Delft Engineering, Systems and Services)","","2024","Open Government Data (OGD) has been considered as a potent instrument for value creation and innovation by a range of stakeholders. Given that individual ingenuity is a function of individual and environmental factors, it is important to understand how the OGD adoption and usage is a factor of creative performance behaviors (CPB), viz., Problem Identification (PI), Information Search (IS), Idea Generation (IG) and Idea Promotion (IP) as well as creative self-efficacy (CSE). Invoking the adapted Unified Theory of Acceptance and Use of Technology (UTAUT) constructs alongside the moderating effects of CPB and CSE constructs and also gender, the present study seeks to underline the behavioural intention towards OGD adoption and usage among 362 undergraduate and postgraduate university students in India. The guiding research question is: “Is there any difference among the males and females in terms of their OGD adoption and usage as far as their creative propensities are concerned?” Findings from the PLS-SEM (Partial Least Squares-Structural Equation Modeling) procedures show that there are gender differences across the CPB and CSE constructs. The study's contribution lies in furthering our understanding of OGD adoption and use with the additional determinants of creativity literature.","CPB; Creative performance behavior; Creative self-efficacy; Creativity; CSE; Gender; OGD; Open government data; UTAUT","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-09-18","","Engineering, Systems and Services","Information and Communication Technology","","",""
"uuid:bd9a6840-9c69-43a3-9720-730d5879d4b6","http://resolver.tudelft.nl/uuid:bd9a6840-9c69-43a3-9720-730d5879d4b6","Developing places for human capabilities: Understanding how social sustainability goals are governed into urban development projects","Janssen, C. (TU Delft Practice Chair Urban Area Development)","Verdaas, J.C. (promotor); Daamen, T.A. (copromotor); Delft University of Technology (degree granting institution)","2024","Although social objectives are frequently part of the pursuit of sustainable urban development, how such social sustainability goals can be achieved in urban development practices remains a largely unsolved puzzle. While scholars increasingly acknowledge that urban social sustainability is a plural concept that needs to be specified in different situations, thus far very few social sustainability studies have focused on the processes in which such specifications take place – i.e., the implementation processes in which policies are brought into practice in urban areas or neighborhoods. This dissertation develops an understanding of how institutionalized governance processes affect the implementation of policy goals related to social sustainability in area-based urban development projects. The research draws on Sen’s Capability Approach (CA) to construct a capability-centered evaluation of such efforts. More than other normative approaches that primarily focus on the distribution or quality of spatial goods, the principles of the CA focus on the fact that different people have different experiences. Unique personal, social, and environmental circumstances per individual imply that people have different capabilities: the actual freedoms to do or be what one considers valuable for a dignified life. A promising role is reserved for the CA to investigate how exactly the diversity of human beings can be incorporated into urban development and planning processes. This provides a sincere response to the calls of social sustainability scholars that more ‘human-centered’ approaches are needed. The dissertation hypothesizes that governance processes around urban development projects hold various elements that affect the implementation of social sustainability in contemporary cities, and subsequently, influence whether ‘capability-centered urban outcomes’ are achieved or not. In that way, this dissertation analyzes how governance processes in urban development practice relate to capability-centered evaluations of urban social sustainability outcomes. Whereas these two aspects are often investigated separately – i.e., studies often either focus on analyzing the mechanisms within governance processes or on describing and evaluating social outcomes in the urban environment – this dissertation explicitly brings these together. The governance process is investigated from a collaborative governance perspective to analyze which activities and interactions between the different stakeholders affect capability-centered social sustainability outcomes in urban environments, and complementary, from an institutionalist perspective that explores what less-visible, yet structural elements of governance condition the emergence of capability-centered governance activities.","social sustainability; urban development projects; collaborative governance; institutions; capability approach","en","doctoral thesis","A+BE | Architecture and the Built Environment","978-94-6366-799-9","","","","","","","","","Practice Chair Urban Area Development","","",""