"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:9062a160-7556-44c3-a06c-7579961da0a4","http://resolver.tudelft.nl/uuid:9062a160-7556-44c3-a06c-7579961da0a4","Unveiling complexity of hydrogen integration: A multi-faceted exploration of challenges in the Dutch context","Hasankhani, M. (TU Delft Design for Sustainability); van Engelen, J.M.L. (TU Delft Design for Sustainability); Celik, S (TU Delft Methodologie en Organisatie van Design); Diehl, J.C. (TU Delft Design for Sustainability)","","2024","As the transition to sustainable energy intensifies, hydrogen emerges as a pivotal medium in mitigating climate change and improving energy security. While its applicability across various sectors is undeniable, its integration into established energy systems presents multifaceted challenges. This study investigates the complexities of integrating hydrogen into the Netherlands' energy systems. Beyond technological advancements, the successful design and rollout of a hydrogen supply chain require coordination and collaboration among a myriad of stakeholders. Through a mixed-methods approach, this study combines findings from a broad literature review, policy document analyses, evaluation of 59 field projects, and engaging dialogues with 33 key stakeholders from different sectors. This investigation led to the identification and categorization of key players in the Dutch hydrogen sector, revealing their interconnected roles and the challenges encountered in the hydrogen integration process. The study further categorized the identified challenges faced by stakeholders into five core domains: technical, infrastructural (including supply chain), socioeconomic, environmental, and institutional, with associated factors. Prominent challenges include transportation infrastructure upgrades, high initial costs and scalability, effective storage methods, safety and cybersecurity measures, storage and distribution infrastructure, security of supply, and public acceptance. This study contributes to the hydrogen integration discourse, offering insights for academics, industry, and policymakers. Its detailed stakeholder analysis, holistic categorization of challenges across five domains, and a stakeholder-centric approach grounded in real-world dialogues offer applicable frameworks beyond its primary context. In this vein, it guides future research and decisions, and its approach is adaptable for different regions or sectors, emphasizing comprehensive transition strategies.","Hydrogen infrastructure; Hydrogen supply chain; Sectoral distribution shifts; Stakeholder analysis; Stakeholder coordination; Energy policy","en","journal article","","","","","","","","","","","Design for Sustainability","","",""
"uuid:151efe59-e26c-4eac-aa83-16a67930ae6e","http://resolver.tudelft.nl/uuid:151efe59-e26c-4eac-aa83-16a67930ae6e","On string vibrations influenced by a smooth obstacle at one of the endpoints","Ihsan, A.F. (Telkom University); van Horssen, W.T. (TU Delft Mathematical Physics); Tuwankotta, J.M. (Institute of Technology Bandung)","","2024","In this paper, the vibrations of a string are considered. At one end of the string, a smooth obstacle is placed and the other end of the string is attached to a fixed point. The contact between the string and the obstacle varies in time, and leads to a linear, moving boundary value problem for the string vibrations. By applying a boundary fixing transformation, the problem is transformed from a linear problem with a moving boundary, to a nonlinear problem with fixed boundaries. It is assumed that the vibrations around the stationary position of the string are small. Explicit approximations of the solution are obtained by using a multiple time-scales perturbation method. Depending on the parameters in the problem, it turns out that three different cases for the obstacle boundary condition have to be considered, that is, Dirichlet, or Neumann, or Robin type of boundary conditions. To avoid an infinite-dimensional system of ordinary differential equations that occurs in the analysis of the modal interactions of the string vibrations, characteristic coordinates are used together with a multiple time-scales approach to analyze the string dynamics in terms of traveling waves in opposite directions. A comparison between a direct numerical integration of the PDE problem and the results obtained by using the aforementioned perturbation approach shows an excellent agreement in the results.","Characteristic coordinates; Modal interactions; Moving boundary problem; Multiple time-scales perturbation method","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.","","2024-07-27","","","Mathematical Physics","","",""
"uuid:98dcc7af-1d83-417f-9909-7308bdad9b9e","http://resolver.tudelft.nl/uuid:98dcc7af-1d83-417f-9909-7308bdad9b9e","Receding Horizon Re-Ordering of Multi-Agent Execution Schedules","Berndt, Alexander (Overstory B.V.); Van Duijkeren, Niels (Robert Bosch GmbH); Palmieri, Luigi (Robert Bosch GmbH); Kleiner, Alexander (Robert Bosch GmbH); Keviczky, T. (TU Delft Team Tamas Keviczky)","","2024","The trajectory planning for a fleet of automated guided vehicles (AGVs) on a roadmap is commonly referred to as the multi-agent path finding (MAPF) problem, the solution to which dictates each AGV's spatial and temporal location until it reaches its goal without collision. When executing MAPF plans in dynamic workspaces, AGVs can be frequently delayed, e.g., due to encounters with humans or third-party vehicles. If the remainder of the AGVs keeps following their individual plans, synchrony of the fleet is lost and some AGVs may pass through roadmap intersections in a different order than originally planned. Although this could reduce the cumulative route completion time of the AGVs, generally, a change in the original ordering can cause conflicts, such as deadlocks. In practice, synchrony is therefore often enforced by using a MAPF execution policy employing, e.g., an action dependency graph (ADG) to maintain ordering. To safely re-order without introducing deadlocks, we present the concept of the switchable action dependency graph (SADG). Using the SADG, we formulate a comparatively low-dimensional mixed-integer linear program that repeatedly re-orders AGVs in a recursively feasible manner, thus maintaining deadlock-free guarantees, while dynamically minimizing the cumulative route completion time of all AGVs. Various simulations validate the efficiency of our approach when compared to the original ADG method as well as robust MAPF solution approaches.","Mixed integer programming; multi-agent path finding (MAPF); robust plan execution; scheduling and coordination","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.","","2024-06-18","","","Team Tamas Keviczky","","",""
"uuid:5f94e970-ddfd-4855-8acb-b46063e0887c","http://resolver.tudelft.nl/uuid:5f94e970-ddfd-4855-8acb-b46063e0887c","Optimizing public transport transfers by integrating timetable coordination and vehicle scheduling","Liu, Tao (Southwest Jiaotong University); Ji, Wen (Southwest Jiaotong University); Gkiotsalitis, Konstantinos (National Technical University of Athens); Cats, O. (TU Delft Transport and Planning)","","2023","Transfer optimization in public transport (PT) networks can be achieved through coordinated timetabling and vehicle scheduling. Traditionally, the coordinated timetabling problem is solved first before proceeding to the vehicle scheduling problem. The integration of these two problems can help further reduce the total operation cost and improve the level of service, especially when timetables of different PT lines are well-coordinated at transfer stations. This work addresses the integrated PT timetable coordination and vehicle scheduling problem while ensuring that each PT line is dispatched with an even headway. We first separately formulate two integer linear programming models for the timetable coordination and vehicle scheduling problems. Next, the two models are integrated into a bi-objective integer linear programming model for the integrated timetable coordination and vehicle scheduling problem. For small size PT networks, the model can be solved by using an ɛ-constraint method, together with off-the-shelf optimization solvers. For large-size problems, two constraint-reduction procedures are developed to reduce the number of redundant constraints so as to reduce the computation complexity and improve the solution process. Finally, the models and solution method are applied to a numerical example and a real-world bus rapid transit (BRT) network in Chengdu, China. Computation results show that the solution generated by the sequential optimization approach is usually dominated by the Pareto-optimal solutions generated by the integrated optimization approach. Our findings suggest that it is not a wise decision to use the solution generated by the sequential optimization approach or the solution with the minimum fleet size generated by the integrated optimization approach. For practical implementation, it is recommended to choose the solution that has a fleet size of one more vehicle than the minimum fleet size.","Integer programming; Public transport; Timetable coordination; Transfer optimization; Vehicle scheduling","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:fd0562a1-b5ba-4342-a9b7-587308b139c5","http://resolver.tudelft.nl/uuid:fd0562a1-b5ba-4342-a9b7-587308b139c5","Optimization of Coordinated Flow Control and Skip-stopping Schemes for Urban Rail Stations Considering Platform Carrying Capacity","Zhang, Yu (Beijing Jiaotong University); Dong, Y. (TU Delft Transport and Planning)","","2023","The platform carrying capacity of urban rail transit stations is limited and overcrowding of the platform will lead to serious safety risks for passengers and trains. It is significant to collaborate on the optimization of passenger flow strategy and skip-stopping scheme to alleviate traffic pressure and ensure platform safety. This study proposes and solves the joint optimization problem of coordinated flow control and skip-stopping scheme considering platform carrying capacity. Firstly, platform demand constraints and platform stranded constraints are designed according to the maximum carrying capacity of the platform to control the number of allowable arrivals ensuring platform safety. Secondly, train arrival variable and train stop variable are introduced to generate train skip-stopping index. Finally, considering the characteristics of passengers' continuous arrival and platform carrying capacity, a mixed integer programming model is established to minimize the number of passengers outside the station and the number of passengers stranded on the platform. Based on empirical data, this study takes Beijing Batong line as a case study and uses the established model to generate flow control strategy and skip-stopping schemes for each station during morning rush hours. Experimental results show that compared to the baseline without implementing the two proposed strategies, the proposed collaborative optimization method can effectively reduce the demand for staying at the platform and increase the number of boarding passengers at downstream stations. Thus, the balance between train capacity and passenger flow demand is maintained while ensuring platform safety. Moreover, the proposed method can also avoid overcrowding at downstream stations.","urban rail transit; coordinated passenger flow control; mixed integer programming; skip-stopping scheme; station platform capacity","en","poster","","","","","","","","","","","Transport and Planning","","",""
"uuid:9db9f1dd-bf55-4350-9737-ee4793ac7fb0","http://resolver.tudelft.nl/uuid:9db9f1dd-bf55-4350-9737-ee4793ac7fb0","Coupling Relationship between Rural Settlement Patterns and Landscape Fragmentation in Woodlands and Biological Reserves: A Case of Nanshan National Park","Li, Bo (Central South University China); Ouyang, Hao (Central South University China); Wang, T. (TU Delft Design & Construction Management); Dong, Tian (Central South University China)","","2023","Exploring the influence of settlement patterns on the landscape fragmentation in woodlands and biological reserves is key to achieving ecologically sustainable development. In this research, we chose the Nanshan National Park in Hunan Province, China, as a case study, to explore the influence mechanisms. First, we identified the biological reserves through the landscape security patterns of biological conservation. Second, we constructed a coupling coordination model to analyze the coupling relationship between the settlement patterns and landscape fragmentation in the woodlands and biological reserves. The analysis showed that, overall, the effect of the settlement area on the landscape fragmentation in the biological reserves was more pronounced, while the effect of the settlement spread and shape on the landscape fragmentation in the woodlands was more obvious. From a type-specific perspective, we analyzed the coupling relationship between the settlement patterns and (1) the landscape fragmentation in different woodlands and (2) the landscape fragmentation in the biological reserves, namely concerning Leiothrix lutea and Emberiza aureola. We found that the effect of the settlement patterns on the landscape fragmentation of the Leiothrix lutea biological reserve was more significant than that of the landscape fragmentation of its main habitat, the evergreen broad-leaved forest. The effect of settlement patterns on the landscape fragmentation of the Emberiza aureola biological reserve was more significant than that of the landscape fragmentation of its other habitats. In addition, the results demonstrated that the habitat protection of the woodlands was not a substitute for the systematic protection of biosecurity patterns. This research could assist in developing more efficient conservation measures for ecologically protected sites with rural settlements.","settlement pattern; woodland ecosystem; landscape security pattern; landscape fragmentation; coupling coordination degree","en","journal article","","","","","","","","","","","Design & Construction Management","","",""
"uuid:bc00d0ca-075a-428d-a4a5-e2bddaa1bb09","http://resolver.tudelft.nl/uuid:bc00d0ca-075a-428d-a4a5-e2bddaa1bb09","Energy systems-Making energy services available","Correljé, A. (TU Delft Economics of Technology and Innovation)","","2023","Making progress in the energy transition requires a more concrete conceptualization of the way in which the energy system works, now and in the future. This chapter presents a fairly simple conceptual framework that will help to analyze and understand the way in which communities provide themselves (more or less effectively) with the energy they need to support their social and economic activities. It provides insight into how the notion of a supply chain helps us to understand the geophysical and technical aspects of ‘harvesting’ the raw energy as found in nature and bringing it as practically usable and sustainable energy carriers to societies. Thereupon it explains how humans and societies make this supply chain actually work, turning it into a constantly evolving value chain by means of the institutional and economic coordination of the activities, driven by the values the public and private actors involved maintain.","Energy system; Supply chain; Institutions; Values; Coordination","en","book chapter","Edward Elgar Publishing","","","","","","","2024-04-10","","","Economics of Technology and Innovation","","",""
"uuid:dfd71d78-344e-4833-bb7a-78581443965a","http://resolver.tudelft.nl/uuid:dfd71d78-344e-4833-bb7a-78581443965a","An exact optimization method for coordinating the arrival times of urban rail lines at a common corridor","Gkiotsalitis, K. (University of Twente); Cats, O. (TU Delft Transport and Planning); Liu, T. (Southwest Jiaotong University); Bult, J. M. (University of Twente)","","2023","The trips of a high-frequency urban rail line are typically planned with the aim of achieving even time headways. This results in reliable services for each urban rail line, where successive trips have the same time headway. Maintaining even time headways for each service line has significant advantages for the passengers of the line, but it might result in safety issues, vehicle bunching, and increased transfer times at a common corridor served by multiple urban rail lines. This study investigates the problem of urban rail corridor coordination and develops an exact optimization method for coordinating the vehicle trips of different lines that serve stations along a joint corridor. The proposed formulation is a non-convex mathematical program which is reformulated as a mixed-integer quadratic program with a convex objective function. A branch-and-bound algorithm coupled with the Active-set method is proposed for solving the model to global optimality. Results from a toy network and a case study of the light rail service in The Hague, The Netherlands, demonstrate the improvement potential of time headways at a common corridor, while accounting for the effect on the variation of time headways at isolated segments of the individual service lines.","Convex optimization; Coordination; Scheduling; Train corridor","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:3211024d-9e4b-4935-bcc3-01de3a897008","http://resolver.tudelft.nl/uuid:3211024d-9e4b-4935-bcc3-01de3a897008","Distributed Dynamic Coordination Control for Offshore Platform Transportation Under Ocean Environmental Disturbances","Du, Zhe (TU Delft Transport Engineering and Logistics); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Reppa, V. (TU Delft Transport Engineering and Logistics)","","2023","Transportation of a large offshore platform from inland waters to the open sea is a hazardous and challenging mission. With the development of the autonomous surface vessel (ASV), the problem of large floating object transportation has a chance to be solved by applying multiple physical-connected autonomous tugboats. This article proposes a distributed dynamic coordination control scheme for a multivessel autonomous towing system to transport an offshore platform under environmental disturbances. Where the dynamic coordination decision mechanism is based on the relative position of the two neighbor waypoints, the controllers are designed based on the multilayer model-predictive control (MPC) strategy with several specific cost functions, and the distributed control architecture is built based on the alternating direction method of multipliers (ADMM) with augmented Lagrangian function. The simulation experiment indicates that the proposed control scheme can achieve better consensus for the distributed control architecture accomplishment and more efficiently transport an offshore platform under environmental disturbances.","Distributed model-predictive control (MPC); dynamic coordination control; environmental disturbances; Force; Hydrodynamics; multivessel system; Offshore installations; offshore platform transportation; Predictive control; Sea surface; Trajectory; Transportation","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.","","2024-01-18","","","Transport Engineering and Logistics","","",""
"uuid:33c06f25-ce4d-4866-9f7d-d983a719da46","http://resolver.tudelft.nl/uuid:33c06f25-ce4d-4866-9f7d-d983a719da46","Optimizing Task Waiting Times in Dynamic Vehicle Routing","Botros, Alexander (University of Waterloo); Gilhuly, Barry (University of Waterloo); Wilde, N. (TU Delft Learning & Autonomous Control); Sadeghi, Armin (University of Waterloo); Alonso-Mora, J. (TU Delft Learning & Autonomous Control); Smith, Stephen L. (University of Waterloo)","","2023","We study the problem of deploying a fleet of mobile robots to service tasks that arrive stochastically over time and at random locations in an environment. This is known as the Dynamic Vehicle Routing Problem (DVRP) and requires robots to allocate incoming tasks among themselves and find an optimal sequence for each robot. State-of-the-art approaches only consider average wait times and focus on high-load scenarios where the arrival rate of tasks approaches the limit of what can be handled by the robots while keeping the queue of unserviced tasks bounded, i.e., stable. To ensure stability, these approaches repeatedly compute minimum distance tours over a set of newly arrived tasks. This letter is aimed at addressing the missing policies for moderate-load scenarios, where quality of service can be improved by prioritizing long-waiting tasks. We introduce a novel DVRP policy based on a cost function that takes the p-norm over accumulated wait times and show it guarantees stability even in high-load scenarios. We demonstrate that the proposed policy outperforms the state-of-the-art in both mean and 95th percentile wait times in moderate-load scenarios through simulation experiments in the Euclidean plane as well as using real-world data for city scale service requests.","Cost function; Costs; Path Planning for Multiple Mobile Robots or Agents; Planning, Scheduling and Coordination; Robot kinematics; Robots; Task analysis; Task Planning; Vehicle dynamics; Vehicle routing","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.","","2024-01-13","","","Learning & Autonomous Control","","",""
"uuid:9d51bacb-ec0e-4095-aebe-212e5b9c3191","http://resolver.tudelft.nl/uuid:9d51bacb-ec0e-4095-aebe-212e5b9c3191","Exact solutions for geophysical flows with discontinuous variable density and forcing terms in spherical coordinates","Chu, Jifeng (Shanghai Normal University; University of Vienna); Iulian Martin, Calin (University of Vienna); Marynets, K. (TU Delft Mathematical Physics; University of Vienna)","","2023","We present here exact solutions to the equations of geophysical fluid dynamics that depict inviscid flows moving in the azimuthal direction on a circular path, around the globe, and which admit a velocity profile below the surface and along it. These features render this model suitable for the description of the Antarctic circumpolar current (ACC). The governing equations we work with–taken to be the Euler equations written in spherical coordinates–also incorporate forcing terms which are generally regarded as means that ensure the general balance of the ACC. Our approach allows for a variable density (depending on the depth and latitude) of discontinuous type which divides the water domain into two layers. Thus, the discontinuity gives rise to an interface. The velocity in both layers and the pressure in the lower layer are determined explicitly, while the pressure in the upper layer depends on the free surface and the interface. Functional analytical techniques render (uniquely) the surface and interface-defining functions in an implicit way. We conclude our discussion by deriving relations between the monotonicity of the surface pressure and the monotonicity of the surface distortion that concur with the physical expectations. A regularity result concerning the interface is also derived.","Coriolis force; discontinuous stratification; Exact solutions in spherical coordinates; forcing terms; the Antarctic Circumpolar Current","en","journal article","","","","","","","","","","","Mathematical Physics","","",""
"uuid:5d5621c8-d102-4f74-b41e-efe3507dd769","http://resolver.tudelft.nl/uuid:5d5621c8-d102-4f74-b41e-efe3507dd769","Adaptive Parameterized Control for Coordinated traffic Management Using Reinforcement Learning","Sun, D. (TU Delft Transport and Planning); Jamshidnejad, A. (TU Delft Control & Simulation); De Schutter, B.H.K. (TU Delft Delft Center for Systems and Control)","","2023","Traffic control is essential to reduce congestion in both urban and freeway traffic networks. These control measures include ramp metering and variable speed limits for freeways, and traffic signal control for urban traffic. However, current traffic control methods are either too simple to respond to complex traffic environment, or too sophisticated for real-life implementation. In this paper, we propose an adaptive parameterized control method for traffic management by using reinforcement learning algorithms. This method takes advantage of the simple structure of parameterized state-feedback controllers for traffic; meanwhile, a reinforcement learning agent is employed to adjust the parameters of the controllers on-line to react to the varying environment. Therefore, the proposed method requires limited real-time computational efforts, and is adaptive to external disturbances. Furthermore, the reinforcement learning agent can coordinate multiple local traffic controllers when adjusting their parameters. The method is validated by a numerical case study on a freeway network. Results show that the proposed method outperforms conventional controllers when the system is exposed to a changing environment.","Parameterized control; adaptive control; reinforcement learning; coordinated control; traffic network system","en","journal article","","","","","","","","","","Delft Center for Systems and Control","Transport and Planning","","",""
"uuid:3b699bac-c7ce-41c0-b8ae-acca10114ba5","http://resolver.tudelft.nl/uuid:3b699bac-c7ce-41c0-b8ae-acca10114ba5","Deconstructing Organizational Capabilities of Megaproject Owners: Dimensions and Levels","Zhang, X. (TU Delft Design & Construction Management; Tongji University); Liu, Mingqiang (Tongji University; Tenth People's Hospital Affiliated Tongji Univ. and Shanghai Tenth People's Hospital); Le, Yun (Tongji University); Wei, Jianjun (Shanghai Shenkang Hospital); Zhu, Yongsong (Tenth People's Hospital Affiliated Tongji Univ. and Shanghai Tenth People's Hospital); Li, Yongkui (Tongji University)","","2023","Given that a strong owner has been identified as an important factor in the success of megaprojects, there has been a growing recognition of the importance of megaproject owner organizational capabilities. However, the questions of what organizational capabilities do owners need to foster successful megaprojects, and whether these capabilities are the stronger the better, have yet to be addressed. To answer these questions, this study identified the dimensions of owner organizational capabilities based on literature and interviews, and developed several sets of parallel hypotheses. Based on the 229 valid questionnaire data collected, the relationships between owner organizational capabilities and megaproject success were analyzed through hierarchical multiple regression, and the results were discussed through expert interviews. The findings show that owner coordination, dynamic, and system integration capabilities have positive impacts on megaproject success, with coordination capabilities being the most significant. While the impact of motivational capabilities on megaproject success is inverted U-shaped. This study provides an actionable dimensional framework for megaproject owner capabilities, moving the field of owner organizational capabilities beyond the conceptual level. This study provides empirical evidence for the importance of megaproject owner organizational capabilities and takes a more dialectical view of a strong owner. The empirical results can provide insights and guidance on the configuration and development of megaproject owner capabilities.","Coordination capabilities; Dynamic capabilities; Megaproject success; Motivational capabilities; Owner organizational capabilities; System integration capabilities","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.","","2023-11-09","","","Design & Construction Management","","",""
"uuid:619023fa-7019-4cc3-bec3-42b1debc4af1","http://resolver.tudelft.nl/uuid:619023fa-7019-4cc3-bec3-42b1debc4af1","Metal containing nanoclusters in zeolites","Li, G. (TU Delft ChemE/Inorganic Systems Engineering; Wageningen University & Research); Pidko, E.A. (TU Delft ChemE/Inorganic Systems Engineering)","","2023","The molecular-sized void space of the zeolitic micropores is perfect matrices to encapsulate and stabilize multicomponent and multifunctional complexes that can be used as active sites for a wide range of important catalytic transformations. In this article, we discuss and analyze the key developments of the last decade in the catalytic chemistry of metal-containing nanoclusters confined in zeolite micropores. We will present a concise summary of the recent developments in the tailored synthesis strategies, the advanced in-situ and operando characterization techniques, the enhanced performances of zeolite stabilized nanoclusters in various catalytic processes, and the application of computational modeling approaches for addressing the puzzle of catalyst-reactivity relationships. The article will be concluded with a brief discussion on the perspective for future developments anticipated for this field.","Active site dynamics; Catalysis; Computational modeling; Coordination chemistry; Encapsulation; Nanoclusters; Operando modeling; Operando spectroscopy; Reaction mechanism; Single-atom catalysis; Transition metals; Zeolite catalysis; Zeolites","en","book chapter","Elsevier","","","","","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","","","ChemE/Inorganic Systems Engineering","","",""
"uuid:df4e2934-29c2-49e1-bed1-2363f0d7f50b","http://resolver.tudelft.nl/uuid:df4e2934-29c2-49e1-bed1-2363f0d7f50b","Stochastic-priority-integrated signal coordination considering connected bus operation uncertainties","Ou, S. (TU Delft Transport and Planning; Tongji University); An, Kun (Tongji University); Ma, Wanjing (Tongji University); Hegyi, A. (TU Delft Transport and Planning); van Arem, B. (TU Delft Transport and Planning)","","2023","Multimodal arterial signal coordination for buses and passenger vehicles can improve arterial travel smoothness and efficiency. However, uncertainty in bus operations requires signal priority at intersections, which impacts coordination and increases stop times for other traffic types. Therefore, this study proposes a stochastic priority-integrated signal coordination (SPIC) method. It includes an offline stochastic programme to determine the arterial signal coordination, i.e. cycle length and offsets, considering the stochastic signal priority, and an online mixed-integer nonlinear programme to determine the signal priority together with the bus arrival and departure times at and from stops and intersections in a connected vehicle environment. A scenario-based heuristic algorithm is proposed to solve the SPIC efficiently. Numerical studies have validated that SPIC can improve the efficiency of buses and passenger vehicles. Sensitivity analyses show that the SPIC effectively reduces delays with fluctuations in the bus travel time, dwell time, and passenger vehicle demands.","Arterial signal coordination; bus operation uncertainty; connected bus; stochastic programme; transit signal priority","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.","","2024-06-29","","","Transport and Planning","","",""
"uuid:fbe87cba-3290-4c31-a66e-6cd5174ae249","http://resolver.tudelft.nl/uuid:fbe87cba-3290-4c31-a66e-6cd5174ae249","Practice of Planning Coordination for Crossborder Spatial Governance in the Yangtze River Delta Region: A Transformative Analysis in Meta-Governance","Su, D. (TU Delft Urban Development Management; Tsinghua University); Liu, Jian (Tsinghua University)","","2023","Nowadays, city clusters have become an important spatial form in the process of global urbanization, characterized by contiguous development across provincial, municipal, and county administrative boundaries, given all-around cross-border circulation of socio-economic factors at the regional scale has become the trend. In order to pursue their own interests, neighboring administrative regions are driven by localism and often deliberately ignore regional level neighborhood issues, especially ecological and environmental issues regarding “public goods”, coupled with weak cross-border spatial governance at the regional level, this has led to prominent negative externalities and constant conflicts in the development of cross-border areas, seriously affecting the developing quality of the region as a whole. This paper attempts to challenge the traditional technical concept of spatial planning, and introduce the meta-governance theory of public administration discipline. The study empirically demonstrates the Yangtze River Delta(YRD), the representative of China’s regional development and pioneer in cross-border ecological governance as an example, and identifies the evolution of the three-stage regional coordination model in the YDR region since the reform and opening up in China, and the successes and failures of planning meta-governance in the cross-border area under different goal-oriented approaches. This paper summarizes a regional planning meta-governance model with Chinese characteristics, to explore the mechanism of spatial planning, as a policy and technical tool for spatial governance, in responding to the ecological governance of crossborder space, and measures how it can effectively play a synergistic role in the regional scale.","Yangtze River Delta; cross-border; spatial governance; meta-governance; regional planning; spatial planning; coordination","en","conference paper","ENSAP Bordeaux","","","","","","","","","","Urban Development Management","","",""
"uuid:c40b1935-c5f1-4887-9185-d514ef408d6f","http://resolver.tudelft.nl/uuid:c40b1935-c5f1-4887-9185-d514ef408d6f","Activation, Reactivity and Dynamics of Manganese Pincer Complexes in Hydrogenation Catalysis","Yang, W. (TU Delft ChemE/Inorganic Systems Engineering)","Pidko, E.A. (promotor); Filonenko, G.A. (copromotor); Delft University of Technology (degree granting institution)","2022","The growing demands for sustainable chemical technologies have prompted a wave of searching new catalysts based on earth-abundant metals. In the field of (de)hydrogenation catalysis, however, the huge performance gap is commonly seen between the 3d-metal-based catalysts and their noble metal counterparts, which largely hampers their practical applications. In particular, while the Mn-catalyzed (de)hydrogenation has witnessed significant progress since the pioneering work by Beller and co-workers in 2016, most of the reported systems still require relatively high catalyst loadings. Apart from developing new synthetic methodologies based on the hydrogen transfer reactivity of Mn, searching highly active catalysts for (de)hydrogenation reactions therefore remains one of the central topics in Mn chemistry. The current approach to catalyst development is mainly based on the screening of the ligand backbones that proved to be effective for noble metal-based catalysts. However, the screening assessments with the reaction yields as the sole performance metrics do not probe the intrinsic reactivities of the catalysts and can easily result in the overlook of the potential ones due to suboptimal condition choice. In this thesis, we demonstrate in this thesis that the catalyst performance is defined by a complex reaction network comprised of multiple stages of catalyst operation, that is catalyst activation, deactivation, and catalytic turnover. The reactivity of the catalyst itself and the reaction environment of each process determine synergistically the catalytic performance. As a result, the catalytic transformation should be viewed from the system perspective with the performance being a dynamic and highly condition-dependent characteristic.","Homogeneous catalysis; hydrogenation; manganese catalysts; organometallics; coordination chemistry; oprando-spectroscopies","en","doctoral thesis","","978-94-6366-615-2","","","","","","","","","ChemE/Inorganic Systems Engineering","","",""
"uuid:cc7874b6-62b8-4539-9cf6-d63c7bf9dce0","http://resolver.tudelft.nl/uuid:cc7874b6-62b8-4539-9cf6-d63c7bf9dce0","Coordination Strategies for Reducing Price Volatility in Local Electricity Markets","Chakraborty, S.T. (TU Delft Energie and Industrie)","Lukszo, Z. (promotor); Verzijlbergh, R.A. (copromotor); Delft University of Technology (degree granting institution)","2022","With increasing renewable energy and cross-sectoral electrification price volatility is increasing. Flexibility through demand-side management and electric storage has the potential for reducing price volatility. In this thesis, using duality theory the flexibility required for constraining price to a maximum limit is quantified.
Coordination Strategies for Reducing Price Volatility in Local Electricity Markets investigate three case studies varying with respect to type and degree of flexible resource aggregation for constraining price. Insights generated are relevant for regulators, aggregators, energy communities, and scholars focusing on the engineering and economics of local energy systems.","coordination mechanisms; Price volatility; Duality theory; Flexibility; Local electricity markets","en","doctoral thesis","","978-94-6384-331-7","","","","","","","","","Energie and Industrie","","",""
"uuid:d9522685-2a91-431f-a6f5-5454c3933080","http://resolver.tudelft.nl/uuid:d9522685-2a91-431f-a6f5-5454c3933080","Nonlinear Semi-Analytical Model for Axial Flux Permanent-Magnet Machine","Guo, Baocheng (Southeast University); Du, Yunlu (Southeast University); Djelloul KHEDDA, Zakarya (Université Djilali Bounaama Khemis Miliana); Peng, Fei (Southeast University); Dong, J. (TU Delft DC systems, Energy conversion & Storage); Huang, Yunkai (Southeast University); Frederic, Dubas (Femto-St - Sciences et Technologies); Boughrara, Kamel (Nationale Polytechnique: Alger)","","2022","In this article, we propose a novel nonlinear semianalytical model (AM) for the magnetic field calculation of electric machines. The nonlinear properties and local saturation effect of the iron part are taken into consideration in Cartesian coordinates, which is the main contribution of the proposed model. Thus, high accuracy of electromagnetic field results can be obtained with the low computational time cost. The model is developed based on the harmonic modeling technique by solving Maxwell's equations. The detailed theoretical derivations, which use the complex Fourier series and the Cauchy product, are presented. To verify the proposed model, an axial flux permanent-magnet (PM) machine is selected to be investigated. Both finite-element model and experimental results agree well with that of the proposed model. Moreover, the nonlinear AM has potential application for other types of PM electrical motor in Cartesian coordinates, such as flat PM linear machines.","Harmonic model; Cartesian coordinate; Axial flux permanent-magnet machine; Saturation effect","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.","","2022-06-14","","","DC systems, Energy conversion & Storage","","",""
"uuid:203a5f82-1095-4ca4-bc6c-c3f963828f5b","http://resolver.tudelft.nl/uuid:203a5f82-1095-4ca4-bc6c-c3f963828f5b","Real-time UAV routing strategy for monitoring and inspection for post-disaster restoration of distribution networks","Fu, J. (TU Delft Team Bart De Schutter); Nunez, Alfredo (TU Delft Railway Engineering); De Schutter, B.H.K. (TU Delft Team Bart De Schutter)","","2022","Natural disasters pose a tremendous risk to the reliability of distribution networks. In this paper, a novel real-time UAV routing strategy for coordination between monitoring and inspection for post-disaster restoration in distribution networks is proposed. With our proposed real-time UAV routing strategy, damages can be inspected by UAVs for post-disaster restoration. Besides, transmission lines can be monitored to find potential dangers, and road infrastructure can also be monitored to provide real-time information about traffic conditions so that repair crews can select the best ways to reach damages. In addition, due to unpredictable events during restoration, the UAV routing strategy and schedule need to be updated in real time. Then, to tackle the multi-time-scale characteristic of the proposed UAV routing strategy, a two-layer computation architecture is proposed. A case study based on the distribution network in Zaltbommel, the Netherlands, illustrates the effectiveness of the proposed method compared to other approaches.","Distribution network post-disaster restoration; Distribution networks; Inspection; Maintenance engineering; Monitoring; monitoring and inspection coordination; real-time routing for unpredictable events; Real-time systems; Roads; Routing; unmanned aerial vehicles routing strategy","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.","","","","","Team Bart De Schutter","","",""
"uuid:b907c320-5b99-420a-9709-d916337732d1","http://resolver.tudelft.nl/uuid:b907c320-5b99-420a-9709-d916337732d1","Distributed Transactive Framework for Congestion Management of Multiple-Microgrid Distribution Systems","Fattaheian-Dehkordi, Sajjad (Aalto University; Sharif University of Technology); Rajaei, A. (TU Delft Intelligent Electrical Power Grids; Sharif University of Technology); Abbaspour, Ali (Sharif University of Technology); Fotuhi-Firuzabad, Mahmud (Aalto University; Sharif University of Technology); Lehtonen, Matti (Aalto University)","","2022","The privatization of distribution systems has resulted in the development of multiple-microgrid (multiple-MG) systems where each microgrid independently operates its local resources. Moreover, the high integration of independent distributed energy sources could lead to operational issues such as grid congestion in future distribution systems. Therefore, this paper provides a transactive-based energy management framework to operate multiple-MG distribution systems; while, alleviating grid congestion in a decentralized manner. In this respect, alternating direction method of multipliers (ADMM) is considered to develop an operational framework that copes with distributed nature of multiple-MG systems. In this context, a novel procedure in the context of ADMM is proposed to distributedly determine transactive coordinator signals which address energy prices as well as power losses and grid congestions. Furthermore, each MG takes into account stochastic programming and the conditional value-at-risk index to handle the uncertainty of its operational scheduling. At last, the proposed framework is applied on IEEE 37-bus and 123-bus test grids to investigate its efficacy in distributed energy management of multiple-MG systems.","Congestion alleviation; distribution grid; multiple-microgrid system; responsive local resources; transactive coordinator signal","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","","","Intelligent Electrical Power Grids","","",""
"uuid:578e5d58-836f-4b21-8baa-8db58d71a34b","http://resolver.tudelft.nl/uuid:578e5d58-836f-4b21-8baa-8db58d71a34b","Integrating annotations into multidimensional visual dashboards","Badam, Sriram Karthik (Apple Inc.); Chandrasegaran, R.S.K. (TU Delft Methodologie en Organisatie van Design); Elmqvist, Niklas (University of Maryland)","","2022","Multidimensional data is often visualized using coordinated multiple views in an interactive dashboard. However, unlike in infographics where text is often a central part of the presentation, there is currently little knowledge of how to best integrate text and annotations in a visualization dashboard. In this paper, we explore a technique called FacetNotes for presenting these textual annotations on top of any visualization within a dashboard irrespective of the scale of data shown or the design of visual representation itself. FacetNotes does so by grouping and ordering the textual annotations based on properties of (1) the individual data points associated with the annotations, and (2) the target visual representation on which they should be shown. We present this technique along with a set of user interface features and guidelines to apply it to visualization interfaces. We also demonstrate FacetNotes in a custom visual dashboard interface. Finally, results from a user study of FacetNotes show that the technique improves the scope and complexity of insights developed during visual exploration.","Annotation; coordinated multiple views; multidimensional data","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","","","Methodologie en Organisatie van Design","","",""
"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:76e2a3f0-f7bb-4924-be32-e118825eb011","http://resolver.tudelft.nl/uuid:76e2a3f0-f7bb-4924-be32-e118825eb011","A review of public transport transfer coordination at the tactical planning phase","Liu, Tao (Southwest Jiaotong University; The Hong Kong Polytechnic University); Cats, O. (TU Delft Transport and Planning); Gkiotsalitis, Konstantinos (University of Twente)","","2021","While transferring between public transport services has a negative impact on the level-of-service, it is an inevitable feature of public transport networks. Transfer coordination can help reduce passenger transfer waiting times and improve service connectivity. In this paper, we systematically review the literature on transfer coordination design in public transport systems. First, four solution approaches for solving the transfer coordination design problem (TCDP) are identified and reviewed in detail, namely heuristic rule-based, analytical modelling, mathematical programming, and simulation. We then identify and review three extensions of the TCDP, i.e., considering first or last train transfer optimization, integrating vehicle scheduling, and incorporating passenger demand assignment. Finally, following the synthesis of the literature, some promising future research directions are outlined. This paper provides comprehensive insights on how to better design coordinated transfers to provide a seamless travel experience and improve the service connectivity of public transport networks.","Connectivity; Public transport; Synchronization; Timetable; Transfer coordination; Transfer optimization","en","review","","","","","","","","","","","Transport and Planning","","",""
"uuid:855a42c2-81d5-49aa-8e18-a0e4101a673b","http://resolver.tudelft.nl/uuid:855a42c2-81d5-49aa-8e18-a0e4101a673b","Coordination of Heterogeneous Deferrable Loads using the F-MBC Mechanism","Ramkumar, S. (TU Delft Intelligent Electrical Power Grids); Abdelghany, H.A.M.F. (TU Delft Intelligent Electrical Power Grids); Tindemans, Simon H. (TU Delft Intelligent Electrical Power Grids)","","2021","Increasing participation of prosumers in the electricity grid calls for efficient operational strategies for utilizing the flexibility offered by Distributed Energy Resources (DER) to match supply and demand. This paper investigates the coordination performance of a recently proposed coordination scheme for deferrable loads: Forecast Mediated Market Based Control (F-MBC). Enhancements are made to the simulation setup to enable an analysis of performance in realistic scenarios, with heterogeneous loads and an open-ended simulation horizon. Operational scenarios were formulated to showcase the ability of F-MBC to schedule heterogeneous populations of deferrable loads with dynamic load profiles, supported by a mix of renewable and flexible generation. Availability patterns of devices were generated to take into account varying user preferences. Simulation results indicate that F-MBC was able to achieve good distributed scheduling performance for devices with a high initial power consumption. However, performance for devices with low initial power consumption has been found to be less satisfactory. Several directions for further improvement of the F-MBC scheme and its applications are identified.","Demand Response; Distributed Coordination; Flexibility; Market Based Control; Rolling Horizon Scheduling","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.","","2022-01-29","","","Intelligent Electrical Power Grids","","",""
"uuid:9e597e5b-920f-4318-9657-96838f5b0402","http://resolver.tudelft.nl/uuid:9e597e5b-920f-4318-9657-96838f5b0402","Food supply chain coordination for growing items: A trade-off between market coverage and cost-efficiency","Pourmohammad-Zia, Nadia (Amirkabir University of Technology); Karimi, Behrooz (Amirkabir University of Technology); Rezaei, J. (TU Delft Transport and Logistics)","","2021","The accurate operation of a Food Supply Chain (FSC) is a critical issue as it directly interfaces with health and safety matters. This study addresses coordination and conflict management in a three-level FSC that embraces a new inventory type known as growing items like poultry and livestock. The chain involves a rearing farm as the supplier, a processed food producer as the manufacturer, and multiple processed food retailers. Vendor Managed Inventory (VMI) is applied by the manufacturer to handle the retailers' systems and prevent replenishment mismatches and thereby food waste. To increase its market coverage, the manufacturer needs to provide the retailers with enough incentives to enter this setting. So, a cost-sharing contract is designed under which the manufacturer undertakes a fraction of the retailers’ holding costs. Accordingly, the manufacturer faces two contradictory targets, increasing its market coverage by convincing the retailers to enter the system on the one hand and managing its costs efficiently on the other hand. An analytic solution approach with a game-theoretic perspective is developed to solve the model. Extensive numerical experiments and a case study are provided, presenting fruitful managerial insights that can be utilized by the policymakers and chain members under different settings. The results highlight the efficiency of our VMI and cost-sharing collaboration scheme in enhancing the performance of the chain.","Coordination; Cost-efficiency; Food supply chain; Growth; Market coverage; Vendor managed inventory","en","journal article","","","","","","","","","","","Transport and Logistics","","",""
"uuid:ec6387d1-44bd-487b-b008-dac21b68f706","http://resolver.tudelft.nl/uuid:ec6387d1-44bd-487b-b008-dac21b68f706","A holding control strategy for diverging bus lines","Laskaris, G. (TU Delft Transport and Planning; University of Luxembourg); Cats, O. (TU Delft Transport and Planning; KTH Royal Institute of Technology); Jenelius, Erik (KTH Royal Institute of Technology); Rinaldi, M. (TU Delft Transport and Planning; University of Luxembourg); Viti, Francesco (University of Luxembourg)","","2021","Holding has been extensively used as control strategy to regulate public transport operations, especially to maintain even headways and prevent buses of the same line to bunch up. Applying holding to multiple lines requires however to deal with the transition between corridor and branching segments. In this study, we introduce a holding criterion for network configurations with lines that operate jointly along a common corridor and then diverge to individual branches serving different urban areas. The proposed holding decision rule accounts for all different passenger groups in the overlapping segment and considers the transition to individual line operation. The holding rule is evaluated using simulation for different demand levels and compositions and is compared with state-of-the-art control schemes for a real-world network. Results show that the proposed multi-line control yields performance improvements along the shared transit corridor as well as at the line level. The performance of the control scheme is affected by the demand composition and we provide indications regarding the conditions under which multi-line control is advisable.","Branch and trunk network operations; Corridor management; Real time holding control; Transit line coordination","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:a12d30c8-65fc-48f4-aee7-8eebb5da9985","http://resolver.tudelft.nl/uuid:a12d30c8-65fc-48f4-aee7-8eebb5da9985","Early Development of Locomotor Patterns and Motor Control in Very Young Children at High Risk of Cerebral Palsy, a Longitudinal Case Series","Bekius, Annike (Vrije Universiteit Amsterdam); Bach, Margit M. (Vrije Universiteit Amsterdam); van de Pol, Laura A. (Vrije Universiteit Amsterdam); Harlaar, J. (TU Delft Biomechatronics & Human-Machine Control; Vrije Universiteit Amsterdam); Daffertshofer, Andreas (Vrije Universiteit Amsterdam); Dominici, Nadia (Vrije Universiteit Amsterdam); Buizer, Annemieke I. (Universiteit van Amsterdam)","","2021","The first years of life might be critical for encouraging independent walking in children with cerebral palsy (CP). We sought to identify mechanisms that may underlie the impaired development of walking in three young children with early brain lesions, at high risk of CP, via comprehensive instrumented longitudinal assessments of locomotor patterns and muscle activation during walking. We followed three children (P1–P3) with early brain lesions, at high risk of CP, during five consecutive gait analysis sessions covering a period of 1 to 2 years, starting before the onset of independent walking, and including the session during the first independent steps. In the course of the study, P1 did not develop CP, P2 was diagnosed with unilateral and P3 with bilateral CP. We monitored the early development of locomotor patterns over time via spatiotemporal gait parameters, intersegmental coordination (estimated via principal component analysis), electromyography activity, and muscle synergies (determined from 11 bilateral muscles via nonnegative matrix factorization). P1 and P2 started to walk independently at the corrected age of 14 and 22 months, respectively. In both of them, spatiotemporal gait parameters, intersegmental coordination, muscle activation patterns, and muscle synergy structure changed from supported to independent walking, although to a lesser extent when unilateral CP was diagnosed (P2), especially for the most affected leg. The child with bilateral CP (P3) did not develop independent walking, and all the parameters did not change over time. Our exploratory longitudinal study revealed differences in maturation of locomotor patterns between children with divergent developmental trajectories. We succeeded in identifying mechanisms that may underlie impaired walking development in very young children at high risk of CP. When verified in larger sample sizes, our approach may be considered a means to improve prognosis and to pinpoint possible targets for early intervention.","development of walking; early brain lesions; electromyography; intersegmental coordination; muscle synergies","en","journal article","","","","","","","","","","","Biomechatronics & Human-Machine Control","","",""
"uuid:8ec82101-4267-4a3c-ac8d-3ea3f153da91","http://resolver.tudelft.nl/uuid:8ec82101-4267-4a3c-ac8d-3ea3f153da91","Identifying the key risk factors of mega infrastructure projects from an extended sustainable development perspective","Li, Yuanli (Chongqing University); Xiang, Pengcheng (Chongqing University); You, Kairui (Chongqing University); Guo, Jin (Chongqing University); Liu, Z. (TU Delft Integral Design & Management); Ren, Hong (Chongqing University)","","2021","Mega infrastructure projects (MIPs) have become increasingly important to the realization of sustainable development in China. Sustainable development is a process of dynamic balance, and coordinating the triple bottom line (the environmental, social, and economic dimensions) will enable more sustainable development of MIPs. However, previous studies have lacked consideration of coordination when applying sustainable development principles to the systematic identification of risks to MIPs. The goals of this study were to clarify the definition and dimensions of the sustainable development of MIPs and to identify the key risks of MIPs. A literature review was performed to extend the definition of sustainable development of MIPs by combining the triple bottom line with a fourth coordination dimension. A conceptual model of MIP risk identification was then proposed from an extended sustainable development perspective, 22 sustainability elements and 75 risk factors were identified, and the key risk factors were determined based on the interview responses and fuzzy set theory. The results show that economic risks have a high probability, social risks have a high loss, environmental risks have an intermediate probability and loss, and coordination risks have the greatest impact. In addition, the three most important key risk factors were found to be construction and installation cost overruns, land acquisition and resettling cost overruns, and information sharing with the public. Identifying key risk factors can provide information to help stakeholders understand the risk factors associated with MIPs and formulate reasonable risk response strategies.","Coordination; Fuzzy set theory; Mega infrastructure projects; Risk identification; Sustainable development","en","journal article","","","","","","","","","","","Integral Design & Management","","",""
"uuid:21b4b06f-31c9-4381-8490-31cad9b3c04f","http://resolver.tudelft.nl/uuid:21b4b06f-31c9-4381-8490-31cad9b3c04f","Investment planning for flexibility sources and transmission lines in the presence of renewable generation","Khastieva, D. (TU Delft Energie and Industrie)","Amelin, M. (promotor); De Vries, Laurens (promotor); Delft University of Technology (degree granting institution); KTH Royal Institute of Technology (degree granting institution); Comillas Pontifical University (degree granting institution)","2020","Environmental and political factors determine long-term development for renewable generation around the world. The rapid growth of renewable generation requires timely changes in power systems operation planning, investments in additional flexible assets and transmission capacity. The development trends of restructured power systems suggest that the current tools and methodologies used for investment planning are lacking the coordination between transmission and flexibility sources. Moreover, a comprehensive analysis is required for efficient investment decisions in new flexibility sources or transmission assets. However, literature does not provide an efficient modeling tool that will allow such a comprehensive analysis. This dissertation proposes mathematical modeling tools as well as solution methodologies to support efficient and coordinated investment planning in power systems with renewable generation. The mathematical formulations can be characterised as large scale, stochastic, disjunctive, nonlinear optimization problems. Corresponding solution methodologies are based on combination of linearization and reformulation techniques as well as tailored decomposition algorithms. Proposed mathematical tools and solution methodologies are then used to provide an analysis of transmission investment planning, energy storage investments planning as well as coordinated investment planning. The analysis shows that to achieve socially optimal outcome transmission investments should be regulated. Also, the results of the simulations show that coordinated investment planning of transmission, energy storage and renewable generation will result in much higher investments in renewable generation as well as more efficient operation of renewable generation plants. Consequently, coordinated investment planning with regulated transmission investments results in the highest social welfare outcome.","energy storage; wind generation; regulation; Incentive mechanism; transmission; investment planning; coordinated investments; decomposition techniques; Benders decomposition; large scale optimization; disjunctive programming","en","doctoral thesis","","978-91-7873-572-3","","","","","","","","","Energie and Industrie","","",""
"uuid:726704de-b087-41aa-99f6-0a5a609919bc","http://resolver.tudelft.nl/uuid:726704de-b087-41aa-99f6-0a5a609919bc","The coordination‐information bubble in humanitarian response: Theoretical foundations and empirical investigations","Comes, M. (TU Delft System Engineering; TU Delft Transport and Logistics); van de Walle, B.A. (TU Delft Policy Analysis); Van Wassenhove, Luk (Insead)","","2020","Humanitarian disasters are highly dynamic and uncertain. The shifting situation, volatility of information, and the emergence of decision processes and coordination structures require humanitarian organizations to continuously adapt their operations. In this study, we aim to make headway in understanding adaptive decision-making in a dynamic interplay between changing situation, volatile information, and emerging coordination structures. Starting from theories of sensemaking, coordination, and decision-making, we present two case studies that represent the response to two different humanitarian disasters: Typhoon Haiyan in the Philippines, and the Syria Crisis, one of the most prominent ongoing conflicts. For both, we highlight how volatile information and the urge to respond via sensemaking lead to fragmentation and misalignment of emergent coordination structures and decisions, which, in turn, slow down adaptation. Based on the case studies, we derive propositions and the need to continuously align laterally between different regions and hierarchically between operational and strategic levels to avoid persistence of coordination-information bubbles. We discuss the implications of our findings for the development of methods and theory to ensure that humanitarian operations management captures the critical role of information as a driver of emergent coordination and adaptive decisions.","adaptation; coordination; decision-making; humanitarian operations; information; sensemaking","en","journal article","","","","","","","","","","","System Engineering","","",""
"uuid:33f835e5-a972-46b0-98ea-5c350135daff","http://resolver.tudelft.nl/uuid:33f835e5-a972-46b0-98ea-5c350135daff","Robust Network-Wide Bus Scheduling with Transfer Synchronizations","Gkiotsalitis, Konstantinos (University of Twente); Eikenbroek, Oskar A.L. (University of Twente); Cats, O. (TU Delft Transport and Planning)","","2020","Travel time and demand disturbances lead to unreliable bus operations and missed passenger transfers. This study formulates the multi-line synchronization problem as a robust min(i)max problem that considers the fluctuations of the travel and dwell times of bus trips. Given the infeasibility of the multi-line synchronization problem in extreme cases of travel/dwell time disturbances, we introduce a flexible problem formulation that incorporates the constraint violations into the objective function. To produce a robust schedule, the dispatching times of trips are our design variables and the travel and dwell time fluctuations are the environmental variables which have an adversarial role in our minimax problem. We validate our approach in the bus network of The Hague using 1 month of actual vehicle location and passenger counting data. There, we demonstrate the potential improvement in terms of service regularity and increased synchronizations in common case and extreme case conditions.","Bus scheduling; minimax; passenger transfers; regularity-based services; transfer coordination","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.","","2021-03-26","","","Transport and Planning","","",""
"uuid:6a57e1aa-a400-4614-b664-887af2e0bb5b","http://resolver.tudelft.nl/uuid:6a57e1aa-a400-4614-b664-887af2e0bb5b","Design Framework for a Modular Floating Container Terminal","Souravlias, D. (TU Delft Transport Engineering and Logistics); Dafnomilis, I. (TU Delft Transport Engineering and Logistics); Ley, Jens (Development Centre for Ship Technology and Transport Systems); Assbrock, Gerrit (Development Centre for Ship Technology and Transport Systems); Duinkerken, M.B. (TU Delft Transport Engineering and Logistics); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Schott, D.L. (TU Delft Transport Engineering and Logistics)","","2020","The design and development of an offshore port terminal is a complex task that involves distinctive design and decision challenges. In this paper, we propose the implementation of a floating, modular, platform that can act as an additional terminal of a port, with the aim of expanding its current container handling capacity. To this end, we introduce a generic methodology to tackle three aspects of an offshore terminal: terminal layout design, strategic logistics optimization, and operational process coordination. The terminal layout design includes the modular arrangements, handling on and between platform modules by the associated equipment. To select the final layout design concept, we evaluate different alternatives on criteria such as layout complexity, scalability, and the number of moves associated with the modular nature of the platform. Subsequently, the selected concept is given as input to a strategic logistics optimization approach that introduces a mixed-integer linear programming model. The proposed model minimizes the capital, operational, and maintenance costs of the floating modular terminal, i.e., number and size of modules, number and type of equipment, as well as capacities. In parallel, we develop a simulation of the floating terminal’s hinterland connections, where the number and type of required vessels are specified for relevant destinations and transport configurations. At the operational level, we focus on the coordination of handling equipment on the offshore platform by employing a tailored simulation/optimization approach. Our methodology is demonstrated on a case study that considers accommodating the growth of a port in the Hamburg-Le Havre range via the use of a modular, floating, transport, and logistics hub.","terminal design; offshore terminals; floating islands; logistics hub; logistics optimization; operational coordination","en","journal article","","","","","","","","","","","Transport Engineering and Logistics","","",""
"uuid:0937a13d-09c1-4835-884a-79335f3d6750","http://resolver.tudelft.nl/uuid:0937a13d-09c1-4835-884a-79335f3d6750","Random Deviations Improve Micro–Macro Predictions: An Empirical Test","Mäs, Michael (Rijksuniversiteit Groningen); Helbing, D. (TU Delft Values Technology and Innovation; ETH Zürich)","","2020","Many sociological theories make critically different macropredictions when their microassumptions are implemented stochastically rather than deterministically. Deviations from individuals’ behavioral patterns described by microtheories can spark cascades that change macrooutcomes, even when deviations are rare and random. With two experiments, we empirically tested whether macrophenomena can be critically shaped by random deviations. Ninety-six percent of participants’ decisions were in line with a deterministic theory of bounded rationality. Despite this impressive microlevel accuracy, the deterministic model failed to predict the observed macrooutcomes. However, a stochastic version of the same microtheory largely improved macropredictions. The stochastic model also correctly predicted the conditions under which deviations mattered. Results also supported the hypothesis that nonrandom deviations can result in fundamentally different macrooutcomes than random deviations. In conclusion, we echo the warning that deterministic microtheories can be misleading. Our findings show that taking into account deviations in sociological theories can improve explanations and predictions.","coordination game; evolutionary game; experiment; formal modeling; micro–macro problem; network; noise; randomness; theory","en","journal article","","","","","","","","","","Values Technology and Innovation","","","",""
"uuid:78f987f0-67ee-49e1-b5bb-e644a7272a60","http://resolver.tudelft.nl/uuid:78f987f0-67ee-49e1-b5bb-e644a7272a60","Towards coordinated self-organization: An actor-centered framework for the design of disaster management information systems","Nespeca, V. (TU Delft System Engineering); Comes, M. (TU Delft System Engineering; TU Delft Transport and Logistics); Meesters, Kenny (TU Delft Policy Analysis); Brazier, F.M. (TU Delft System Engineering)","","2020","Traditionally, disaster management information systems have been designed to facilitate communication and coordination along stable hierarchical lines and roles. However, to support coordination in disaster response, disaster management information systems need to cater for the emerging roles, responsibilities and information needs of the actors, often referred to as self-organization. To address this challenge, this paper proposes a framework for disaster management information systems that embraces an actor-centered perspective to explicitly support coordination and self-organization. The framework is designed and validated to (i) analyze the current practice of disaster information management, including the way changes occur through self-organization, and (ii) study how to design disaster management information systems that support coordination and self-organization within the current practice. A case study in Jakarta is used to modify and validate the framework, and to illustrate its potential to capture self-organization in practice. The analysis showed that analyzing the actors’ activities through the framework can provide insights on the way self-organization occurs. Moreover, networking, preparedness and centralization were found to be key elements in the design of disaster management information systems with an actor-centered perspective.","Community resilience; Coordination; Disaster response; Humanitarian operations; Information sharing","en","journal article","","","","","","","","","","","System Engineering","","",""
"uuid:d8f31a45-f9de-4dd3-82a4-eb0a6d2152cd","http://resolver.tudelft.nl/uuid:d8f31a45-f9de-4dd3-82a4-eb0a6d2152cd","Formation design for single-pass GEO InSAR considering earth rotation based on coordinate rotational transformation","Chen, Zhiyang (Beijing Institute of Technology); Dong, Xichao (Beijing Institute of Technology); Li, Y. (TU Delft Mathematical Geodesy and Positioning); Hu, Cheng (Beijing Institute of Technology)","","2020","The single-pass geosynchronous synthetic aperture radar interferometry (GEO InSAR) adopts the formation of a slave satellite accompanying the master satellite, which can reduce the temporal decorrelation caused by atmospheric disturbance and observation time gap between repeated tracks. Current formation design methods for spaceborne SAR are based on the Relative Motion Equation (RME) in the Earth-Centered-Inertial (ECI) coordinate system (referred to as ECI-RME). Since the Earth rotation is not taken into account, the methods will lead to a significant error for the baseline calculation while applied to formation design for GEO InSAR. In this paper, a formation design method for single-pass GEO InSAR based on Coordinate Rotational Transformation (CRT) is proposed. Through CRT, the RME in Earth-Centered-Earth-Fixed (ECEF) coordinate system (referred to as ECEF-RME) is derived. The ECEF-RME can be used to describe the accurate baseline of close-flying satellites for different orbital altitudes, but not limited to geosynchronous orbit. Aiming at the problem that ECEF-RME does not have a regular geometry as ECI-RME does, a numerical formation design method based on the minimum baseline error criterion is proposed. Then, an analytical formation design method is proposed for GEO InSAR, based on the Minimum Along-track Baseline Criterion (MABC) subject to a fixed root mean square of the perpendicular baseline. Simulation results verify the validity of the ECEF-RME and the analytical formation design method. The simulation results also show that the proposed method can help alleviate the atmospheric phase impacts and improve the retrieval accuracy of the digital elevation model (DEM) compared with the ECI-RME-based approach.","Coordinate Rotational Transformation (CRT); Earth rotation; GEO InSAR formation design; Minimum Along-track Baseline Criterion (MABC); Relative Motion Equation in ECEF coordinate system (ECEF-RME)","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:607df92d-e649-4cab-bcf9-971ff005df02","http://resolver.tudelft.nl/uuid:607df92d-e649-4cab-bcf9-971ff005df02","Energy resilience through self-organization during widespread power outages","Causevic, S. (TU Delft System Engineering); Saxena, K. (Indian Institute of Technology Delhi); Warnier, Martijn (TU Delft System Engineering); Abhyankar, AR (Indian Institute of Technology Delhi); Brazier, F.M. (TU Delft System Engineering)","","2019","Resilience of power systems is highly impacted by factors such as increasing severity and frequency of weather events, but also smart grid advances that introduce major operational changes in power systems. Rapidly adapting to these changing circumstances and harnessing the potential of technolo- gical advances is the key to ensuring that power systems stay operational during disturbances, thereby improving resilience. This paper addresses this challenge by presenting an approach for improving resilience through local energy resource sharing across multiple distribution systems. The approach brings together the physical and the ICT layer of power systems through a self-organization approach that automatically alters the physical grid topology and forms local energy groups in order to mitigate the effects of widespread outages. Thereby, supply and demand are locally matched, and demand met is maximized during an outage. The results demonstrate that using the proposed approach, operational resilience of impacted distribution systems is improved.","decentralized coordination; Energy resilience; power outages; self-organization","en","journal article","","","","","","","","","","","System Engineering","","",""
"uuid:1bf1c454-2569-4ea8-960a-28a5473d2bb8","http://resolver.tudelft.nl/uuid:1bf1c454-2569-4ea8-960a-28a5473d2bb8","Touchscreens for Aircraft Navigation Tasks: Comparing Accuracy and Throughput of Three Flight Deck Interfaces Using Fitts’ Law","van Zon, N.C.M. (Student TU Delft); Borst, C. (TU Delft Control & Simulation); Pool, D.M. (TU Delft Control & Simulation); van Paassen, M.M. (TU Delft Control & Simulation)","","2019","Objective: Use Fitts’ law to compare accuracy and throughput of three flight deck interfaces for navigation. Background: Industry is proposing touch-based solutions to modernize the flight management system. However, research evaluating touchscreen effectiveness for navigation tasks in terms of accuracy and throughput on the flight deck is lacking. Method: An experiment was conducted with 14 participants in a flight simulator, aimed at creating Fitts’ law accuracy and throughput models of three different flight deck interfaces used for navigation: the mode control panel, control display unit, and a touch-based navigation display. The former two constitute the conventional interface between the pilot and the flight management system, and the latter represents the industry-proposed solution for the future. Results: Results indicate less accurate performance with the touchscreen navigation display compared to the other two interfaces and the throughput was lowest with the mode control panel. The control display unit was better in both accuracy and throughput, which is found to be largely attributed to the tactile and physical nature of the interface. Conclusion: Although performance in terms of accuracy and throughput was better with the control display unit, a question remains whether, when used during a more realistic navigation task, performance is still better compared to a touch-based interface. Application: This paper complements previous studies in the usage of aircraft touchscreens with new empirical insights into their accuracy and throughput, compared to conventional flight deck interfaces, using Fitts’ law.","coordinated action; Fitts’ law; flight displays; human performance modeling; interface evaluation; touchscreens; Fitts' law","en","journal article","","","","","","","","","","","Control & Simulation","","",""
"uuid:2a1e323f-cf52-454b-b70e-543c8ac3ee80","http://resolver.tudelft.nl/uuid:2a1e323f-cf52-454b-b70e-543c8ac3ee80","Thickness-weighted averaging in tidal estuaries and the vertical distribution of the eulerian residual transport","Klingbeil, Knut (Hamburg University of Technology; Leibniz Institute for Baltic Sea Research Warnemünde); Becherer, Johannes (Oregon State University); Schulz, Elisabeth (Leibniz Institute for Baltic Sea Research Warnemünde); de Swart, Huib E. (Universiteit Utrecht); Schuttelaars, H.M. (TU Delft Mathematical Physics); Valle-Levinson, Arnoldo (University of Florida); Burchard, Hans (Leibniz Institute for Baltic Sea Research Warnemünde)","","2019","This paper presents thickness-weighted averaging (TWA) in generalized vertical coordinates as a unified framework for a variety of existing tidal-averaging concepts in seas and estuaries. Vertical profiles of resulting residual quantities depend on the specific vertical coordinate, which is held fixed during the averaging process. This dependence is demonstrated through the application to one-dimensional analytical tidal flow with sediment transport, to field observations from a tidal channel, and to model results from a two-dimensional estuary. The use of different coordinate systems provides complementary views on the residual dynamics and stresses the importance of a correct interpretation of residual quantities obtained by tidal averaging.","Estuaries; Vertical coordinates; Filtering techniques; Tides; Mass fluxes/transport; Baroclinic flows","en","journal article","","","","","","","","2019-12-26","","","Mathematical Physics","","",""
"uuid:6b413af8-2128-4f6e-a19c-e319f7caca66","http://resolver.tudelft.nl/uuid:6b413af8-2128-4f6e-a19c-e319f7caca66","Quick Scan Humanitarian Logistics. Improving lead times for humanitarian intervention: A study of challenges, barriers and opportunities for Dutch NGOs","Meesters, Kenny (TU Delft Policy Analysis); van Schilt, Isabelle (Student TU Delft); Aciru, Monica (ArgusI)","","2019","An increasing number of people are facing the consequences of volatile events around the globe, whether due to natural causes or man-made crises. To prevent further physical, psychological, social and economic collapse after such a critical event, fast and effective humanitarian interventions are needed. However, the mounting frequency and intensity of these events has tested the ability of the international humanitarian community to respond quickly and effectively. This quick scan identifies key themes for improving the delivery of disaster relief during the critical response period (within 72 hours). Specifically, the analysis aims to identify industry best practices and success stories as well as challenges to be overcome.
The quick scan was initiated by the Dutch Coalition for Humanitarian Innovation, and financially supported by Save the Netherlands, the Metropolitan Region Rotterdam-The Hague (MRDH) and Delft University of Technology. The project is further supported by ArgusI, a logistics and supply chain consultancy firm. Throughout the project several NGOs and consultants have supported the project
by providing their input and sharing their insights. The ‘quick scan’ is intended to be a starting point for future research regarding ways to remove logistical bottlenecks. This analysis includes a qualitative description of industry best practices and challenges faced in the field. These findings are based on desk research and interviews with experts from various disaster response organizations together covering a wide range of expertise and experiences in disaster response throughout the past decade.","Humanitarian logistics; Hhumanitarian aid; Coordination; Information management; Emergency response","en","report","Delft University of Technology","","","","","","","","","","Policy Analysis","","",""
"uuid:48f82808-3645-43df-91e6-d0caf5650485","http://resolver.tudelft.nl/uuid:48f82808-3645-43df-91e6-d0caf5650485","Shifts in Spatial Plans for Flood Resilience and Climate Adaptation: Examining Planning Procedure and Planning Mandates","Meng, M. (TU Delft Spatial Planning and Strategy); Dabrowski, M.M. (TU Delft Spatial Planning and Strategy); Stead, D. (TU Delft Spatial Planning and Strategy)","","2019","The paper examines the development of different spatial plans to address flood resilience in the Chinese city of Guangzhou, one of the most vulnerable cities to flooding and climate change. The analysis focuses on the differences in planning procedures and planning mandates (determined by different plans in authority) before and after the launch of the Sponge City Plan which calls for numerous spatial resilience measures to address the increasing flood risk. The analysis reveals that the introduction of the Sponge City Plan has changed the role of planning from onlooker to active participant in the arena of flood governance. In addition, new plans combine long-term strategic visions, soft principles, and strict regulations with an aim to promote concrete planning practice between multiple layers with a clear mandate. Despite these shifts, institutional and territorial challenges remain","Flood risk management; Horizontal interactions; Mandates; Planning tools; Procedures; Spatial planning; Vertical cross-level coordination","en","journal article","","","","","","","","","","","Spatial Planning and Strategy","","",""
"uuid:f6263fd6-913a-41ea-a408-d50f3206c185","http://resolver.tudelft.nl/uuid:f6263fd6-913a-41ea-a408-d50f3206c185","Reaction Time Improvements by Neural Bistability","Koppelaar, H. (TU Delft Interactive Intelligence); Moghadam, Parastou Kordestani (Lorestan University of Medical Sciences, Korramabad); Khan, Kamruzzaman (Pabna University of Science and Technology, Pabna); Kouhkani, Sareh (Islamic Azad University Branch of Shabestar, Shabestar); Segers, Gijs (Gymi Sports, Oosterhout); van Warmerdam, Martin (Van Warmerdam Optometry’s)","","2019","The often reported reduction of Reaction Time (RT) by Vision Training) is successfully replicated by 81 athletes across sports. This enabled us to achieve a mean reduction of RTs for athletes eye-hand coordination of more than 10%, with high statistical significance. We explain how such an observed effect of Sensorimotor systems’ plasticity causing reduced RT can last in practice for multiple days and even weeks in subjects, via a proof of principle. Its mathematical neural model can be forced outside a previous stable (but long) RT into a state leading to reduced eye-hand coordination RT, which is, again, in a stable neural state.","Eye-hand coordination; FitzHugh-Nagumo model; Reaction time; Sensorimotor system; Stroboscopic training","en","journal article","","","","","","","","","","","Interactive Intelligence","","",""
"uuid:7b35feb2-7745-4971-b501-4a2c29a612a8","http://resolver.tudelft.nl/uuid:7b35feb2-7745-4971-b501-4a2c29a612a8","Distributed coordination for collision avoidance of multiple ships considering ship maneuverability","Li, S. (Wuhan University of Technology); Liu, J. (Wuhan University of Technology); Negenborn, R.R. (TU Delft Transport Engineering and Logistics)","","2019","Over the past two decades, a number of methods have been proposed for solving maritime collision avoidance problems. Most of these works take a single ship's perspective and focus on one-to-one or one-to-many situations. To more complicated many-to-many situations, less attention has been paid. To deal with the many-to-many collision avoidance problem, this paper proposes a distributed coordination strategy which consists of two phases: firstly, predictions of ship trajectories are made based on ship dynamics, giving different candidate rudder angles, and potential collision risks that may be caused by each rudder angle selection are evaluated based on calculations of collision risk parameters; secondly, an optimization strategy is adopted to find the most efficient collision avoidance plan for the ships, namely, the rudder angles that each ship should take, and the corresponding operation time for rudder steering, with the overall objective to minimize the sum of time that each ship spends in avoiding collisions with the other ships. Simulation experiments are carried out to evaluate the effectiveness of the proposed method, as well as the corresponding communication and computation costs.","Collision avoidance; Decision making; Distributed coordination; Ship maneuverability","en","journal article","","","","","","Accepted Author Manuscript","","2021-04-16","","","Transport Engineering and Logistics","","",""
"uuid:20b1aebc-06f7-419f-8cc2-f79877d4df9b","http://resolver.tudelft.nl/uuid:20b1aebc-06f7-419f-8cc2-f79877d4df9b","Evaluation of a Multi-Agent System approach to airline disruption management","Bouarfa, S. (TU Delft Air Transport & Operations); Müller, Jasper (Student TU Delft); Blom, H.A.P. (TU Delft Air Transport & Operations)","","2018","Each day, airlines face disturbances that disrupt their carefully planned operations. Events like adverse weather conditions, sick crew members, or damaged aircraft often result in delays in the airline's schedule. An airline recovers from such disruptions through the role played by its Airline Operations Control (AOC). A Multi-Agent System (MAS) approach to airline disruption management was recently proposed under the acronym MASDIMA (Multi-Agent System for Disruption Management in AOC). The purpose of this paper is to evaluate this MAS supported AOC approach on its performance and its practical introduction. This is done using a scenario-based analysis to compare the MAS supported policy to human-team based AOC policies. A task-based analysis identifies how well AOC is able to cover a set of tasks using the MAS supported policy. The scenario-based analysis shows that the MAS supported AOC is able to find the optimal solution, and to do this significantly faster. The task-based analysis identified two main challenges for implementing the MAS supported AOC policy: i) to overcome the loss of experience that is caused by significantly automating humans roles in AOC, and ii) to reduce the workload for people that remain in AOC after its introduction. The paper concludes that implementing the MAS supported AOC policy leads to both better and faster resolutions, though the replacement of human roles also poses novel challenges that remain to be resolved: a potential increase in workload for the remaining human role and loss of experience in handling exceptional situations.","Airline disruption management; Airline operations control; Coordination; Multi-agent systems; Resilience","en","journal article","","","","","","Accepted Author Manuscript","","2020-06-30","","","Air Transport & Operations","","",""
"uuid:f56c9781-78d8-4f79-9070-88855c81c6fe","http://resolver.tudelft.nl/uuid:f56c9781-78d8-4f79-9070-88855c81c6fe","A Hierarchical Control Framework for Coordination of Intersection Signal Timings in All Traffic Regimes","van de Weg, Goof Sterk (TU Delft Transport and Planning); Vu, Hai L. (Monash University); Hegyi, A. (TU Delft Transport and Planning); Hoogendoorn, S.P. (TU Delft Transport and Planning)","","2018","In this paper, we develop a hierarchical approach to optimize the signal timings in an urban traffic network taking into account the different dynamics in all traffic regimes. The proposed hierarchical control framework consists of two layers. The first layer--the network coordination layer--uses a model predictive control strategy based on a simplified traffic flow model to provide reference outflow trajectories. These reference outflow trajectories represent average desired link outflows over time. These are then mapped to green-red switching signals which can be applied to traffic lights. To this end, the second layer--the individual intersection control layer--then selects at every intersection the signal timing stage that realizes an outflow which has the smallest error with respect to the reference outflow trajectory. The proposed framework is tested using both macroscopic and microscopic simulations. It is shown that the control framework can outperform a greedy control policy that maximizes the individual intersection outflows, and the control framework can distribute the queues over the network in a way that the network outflow is improved. Simulations using a macroscopic model allow the direct application of the reference outflows computed by the network coordination layer, and the results indicate that the mapping of the reference outflows to the detailed signal timings by the individual intersection control layer only introduces a small performance loss.","intersection coordination.; link transmission model; Model predictive control; signal timings; urban traffic network control","en","journal article","","","","","","","","","","Transport and Planning","Transport and Planning","","",""
"uuid:396839e6-4811-41de-8bbe-e22309e92a81","http://resolver.tudelft.nl/uuid:396839e6-4811-41de-8bbe-e22309e92a81","A Partition-Enabled Multi-Mode Band Approach to Arterial Traffic Signal Optimization","Ma, Wanjing (Tongji University); Zou, Li (Tongji University); An, Kun (Monash University); Gartner, Nathan H. (University of Massachusetts Lowell); Wang, M. (TU Delft Transport and Planning)","","2018","Arterial traffic signal coordination makes traffic flow more efficient and safer. This paper presents a partition-enabled multi-mode band (PM-BAND) model that is designed to solve the signal coordination problem for arterials with multiple modes, i.e., passenger cars and transit vehicles. The proposed method permits the progression bands to be broken if necessary and optimizes system partition and signal coordination in one unified framework. The impacts of traffic demand of passenger cars and transit vehicles as well as the geometry characteristics of the arterials are taken into account. Signal timings and waiting time of transit vehicles at stations are optimized simultaneously. The PM-BAND model is formulated as a mixed-integer linear program, which can be solved by the standard branch-and-bound technique. Numerical example results have demonstrated that the PM-BAND model can significantly reduce the average number of stops and delay compared with the other models, i.e., MAXBAND and MULTIBAND. Moreover, the progression bands generated by the PM-BAND model have a higher reliability and effectiveness.","Arterial signal coordination; Arteries; Automobiles; Bandwidth; Delays; Numerical models; Optimization; progression band; system partition; transit vehicles","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:8b03a8fd-d2ba-4eef-8f60-1025eed66e28","http://resolver.tudelft.nl/uuid:8b03a8fd-d2ba-4eef-8f60-1025eed66e28","Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL-Cable Systems","Khalilnezhad, H. (TU Delft Intelligent Electrical Power Grids); Popov, M. (TU Delft Intelligent Electrical Power Grids); van der Sluis, L. (TU Delft EEMS - General); Bos, Jorrit A. (TenneT TSO B.V.); Ametani, Akihiro (Doshisha University)","","2018","Energization overvoltages are among the severest overvoltages stressing insulations of EHV power system components. Since these overvoltages have a statistical nature, the insulation level should be determined with the use of a statistical approach by which the distribution of overvoltages is calculated. Literature has properly studied the distribution of energization overvoltages in purely OHL or cable systems, but such a study is not available for hybrid systems consisting of both OHLs and cables. It is expected that the overvoltage distributions change substantially when both OHLs and cables are used in a transmission line. This paper tackles this issue by analyzing the overvoltage distributions due to the energization of a 380 kV hybrid OHL-Cable circuit, in which the cable length is variable. The study includes various sensitivity analyses to find out the impact of system parameters and topology on overvoltages. By the statistical analysis, it has been discovered that energization overvoltages of a hybrid OHL-Cable circuit are higher than those of a fully-cable circuit and very likely lower than those of a fully-OHL circuit with the same transmission lengths.","Cables; energization overvoltages; insulation coordination; statistical analysis; switching transients","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.","","2021-08-17","","","Intelligent Electrical Power Grids","","",""
"uuid:f2fc2852-f41d-4070-9751-7108643c4b98","http://resolver.tudelft.nl/uuid:f2fc2852-f41d-4070-9751-7108643c4b98","On an integration rule for products of barycentric coordinates over simplexes in Rn","Vermolen, F.J. (TU Delft Numerical Analysis); Segal, A. (TU Delft Numerical Analysis)","","2018","In finite-element computations, one often needs to calculate integrals of products of powers of monomials over simplexes. In this manuscript, we prove a generalisation of the exact integration formula that was reported and proved for two-dimensional simplexes by Holand & Bell in 1969. We extend the proof to n-dimensional simplexes and to simplexes on d-dimensional manifolds in n-dimensional space. The results are used to develop finite-element and boundary-element simulation tools. The proofs of the theorems are based on mathematical induction and coordinate mappings.","Barycentric coordinates; Factorisations; Finite element methods; Integration rule","en","journal article","","","","","","","","2019-09-22","","","Numerical Analysis","","",""
"uuid:651cf9c9-391c-4f7d-9a3f-a79b393711e3","http://resolver.tudelft.nl/uuid:651cf9c9-391c-4f7d-9a3f-a79b393711e3","Investigation of Statistical Distribution of Energization Overvoltages in 380 kV Hybrid OHL-Cable Systems","Khalilnezhad, H. (TU Delft Intelligent Electrical Power Grids); Popov, M. (TU Delft Intelligent Electrical Power Grids); Bos, Jorrit A. (TenneT TSO B.V.); de Jong, JPW (TenneT TSO B.V.); van der Sluis, L. (TU Delft EEMS - General)","","2018","Switching operations in power systems can produce significant overvoltages under specific circumstances. With the increasing application of underground cables in transmission systems, the statistical distribution of energization overvoltages is expected to change substantially due to the different electrical characteristics of cables and OHLs. Therefore, it is crucial to perform an insulation coordination study by analysis of the statistical distribution of energization overvoltages. This paper presents a statistical switching analysis on a hybrid OHL-Cable circuit to investigate how such hybrid circuits can affect the distribution of overvoltages. The literature has addressed the distribution of energization overvoltages only for OHLs or cables, but such an study is not available for hybrid systems consisting of OHLs and cables combined. The study is carried out for different cable lengths in the case study to identify how an increasing cable share in the circuit influences the overvoltages distribution due to no-load energization. Moreover, the impact of symmetrical and asymmetrical circuit structures is also addressed. The study is carried out on a distributed frequency-dependent parameter model of the Dutch 380 kV grid in PSCAD/EMTDC.","Cable; energization; insulation coordination; switching overvoltage; statistical switching","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.","","2021-08-17","","","Intelligent Electrical Power Grids","","",""
"uuid:4fcae7ad-e211-48f5-886f-cbfc5383501d","http://resolver.tudelft.nl/uuid:4fcae7ad-e211-48f5-886f-cbfc5383501d","Multiline holding based control for lines merging to a shared transit corridor","Laskaris, Georgios (University of Luxembourg); Cats, O. (TU Delft Transport and Planning; KTH Royal Institute of Technology); Jenelius, Erik (KTH Royal Institute of Technology); Rinaldi, Marco (University of Luxembourg); Viti, Francesco (University of Luxembourg)","","2018","In transit corridors, multiple lines share a sequence of consecutive stops to provide higher joint frequency in higher demand areas. A key challenge is to coordinate the transition from single line to joint operation. A holding control strategy aimed at minimizing passenger travel times is introduced for lines merging into a shared corridor, accounting for the coordination of vehicle arrivals from the merging lines as well as the regularity of each line. The criterion is tested using an artificial network and a real-world network to analyze the impact of demand distribution and compare cooperative versus single line control. We illustrate how the real-time strategy yields overall passenger gains, depending on the composition of different user groups. Results are assessed based on operation and passenger performance indicators and show that coordination is achieved. When combined with joint control in the common part, the proposed approach achieves consistent network-wide travel time benefits.","corridor management; fork line operations; holding control; Line coordination","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.","","2019-05-26","","","Transport and Planning","","",""
"uuid:4275c9d7-1ece-4b02-bb3d-25ae195fe1c0","http://resolver.tudelft.nl/uuid:4275c9d7-1ece-4b02-bb3d-25ae195fe1c0","Analysis and optimal individual pitch control decoupling by inclusion of an azimuth offset in the multiblade coordinate transformation","Mulders, S.P. (TU Delft Team Jan-Willem van Wingerden); Pamososuryo, Atindriyo Kusumo (Student TU Delft); Disario, Gianmarco Emilio (Student TU Delft); van Wingerden, J.W. (TU Delft Team Jan-Willem van Wingerden)","","2018","With the trend of increasing wind turbine rotor diameters, the mitigation of blade fatigue loadings is of special interest to extend the turbine lifetime. Fatigue load reductions can be partly accomplished using individual pitch control (IPC) facilitated by the so-called multiblade coordinate (MBC) transformation. This operation transforms and decouples the blade load signals in a yaw-axis and tilt-axis. However, in practical scenarios, the resulting transformed system still shows coupling between the axes, posing a need for more advanced multiple input multiple output (MIMO) control architectures. This paper presents a novel analysis and design framework for decoupling of the nonrotating axes by the inclusion of an azimuth offset in the reverse MBC transformation, enabling the application of simple single-input single-output (SISO) controllers. A thorough analysis is given by including the azimuth offset in a frequency-domain representation. The result is evaluated on simplified blade models, as well as linearizations obtained from the NREL 5–MW reference wind turbine. A sensitivity and decoupling assessment justify the application of decentralized SISO control loops for IPC. Furthermore, closed-loop high-fidelity simulations show beneficial effects on pitch actuation and blade fatigue load reductions.","azimuth offset; control design; decoupling; individual pitch control; multiblade coordinate transformation","en","journal article","","","","","","","","","","","Team Jan-Willem van Wingerden","","",""
"uuid:724d3e5d-a5ba-43c0-93a2-0f019c7e4b89","http://resolver.tudelft.nl/uuid:724d3e5d-a5ba-43c0-93a2-0f019c7e4b89","Optimization modeling of regional energy systems considering coordination mechanisms","Wang, N. (TU Delft Energie and Industrie); Heijnen, P.W. (TU Delft Energie and Industrie); Verzijlbergh, R.A. (TU Delft Energie and Industrie); Kunneke, R.W. (TU Delft Economics of Technology and Innovation); Herder, P.M. (TU Delft Energy Technology; TU Delft Energie and Industrie)","","2018","Dutch regional municipalities increasingly take an active role in the transition to more sustainable and autonomous energy supply systems, using local energy sources like wind, solar and biomass. The ambition, on the one hand, concerns how an optimal local energy supply system can be designed such that local energy targets can be realized with minimum dependence on the national energy grids. On the other hand, it is of importance to consider the coordination mechanisms between actors such as municipalities, local communities and grid operators, since they will influence the technical configuration of the system. In the literature about renewables-based regional energy systems, the technical optimizations are done mostly from a central planner point of view. Therefore, there lacks a study on the optimization models for regional renewable energy planning that has a comprehensive view on coordination mechanisms and their influence on the system performance. The objective of this work is to enhance the formulation of for self-sufficient regional energy systems by taking coordination mechanisms into account, in order to understand their influences on the system performance. In this paper, a toy model for making optimal long-term investment decisions in electricity generation and transmission will be presented. Two coordination mechanisms, namely one with a central planner, and the other one with a regional market, are considered. In addition, the different modeling approaches for rural and urban energy systems will be discussed. Initial results show that the coordination with a central planner has the least system cost. In the market-based coordination, it is recognized that the degree of shared information and of market participation influences the problem formulation. This results in the cost differences for different coordination mechanisms and for different actors, and thus gives policy implications in the choice of coordination mechanisms and in cost allocation.","Renewable energy sources; regional energy system modeling; optimization methods; coordination mechanisms","en","abstract","","","","","","","","","","","Energie and Industrie","","",""
"uuid:0d475332-5377-45d3-8dc6-212ff990cd58","http://resolver.tudelft.nl/uuid:0d475332-5377-45d3-8dc6-212ff990cd58","On solving wave equations on fixed bounded intervals involving Robin boundary conditions with time-dependent coefficients","van Horssen, W.T. (TU Delft Mathematical Physics); Wang, Y. (TU Delft Mathematical Physics; China University of Mining and Technology); Cao, G. (China University of Mining and Technology)","","2018","In this paper, it is shown how characteristic coordinates, or equivalently how the well-known formula of d'Alembert, can be used to solve initial-boundary value problems for wave equations on fixed, bounded intervals involving Robin type of boundary conditions with time-dependent coefficients. A Robin boundary condition is a condition that specifies a linear combination of the dependent variable and its first order space-derivative on a boundary of the interval. Analytical methods, such as the method of separation of variables (SOV) or the Laplace transform method, are not applicable to those types of problems. The obtained analytical results by applying the proposed method, are in complete agreement with those obtained by using the numerical, finite difference method. For problems with time-independent coefficients in the Robin boundary condition(s), the results of the proposed method also completely agree with those as for instance obtained by the method of separation of variables, or by the finite difference method.","Characteristic coordinates; Formula of d'Alembert; Robin boundary condition; Time-dependent coefficient; Wave equation","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.","","2022-02-25","","","Mathematical Physics","","",""
"uuid:0bab1ae6-4b41-41b1-ae52-afcfba13db0d","http://resolver.tudelft.nl/uuid:0bab1ae6-4b41-41b1-ae52-afcfba13db0d","Non-spherical particles in a pseudo-2D fluidised bed: Modelling study","Mahajan, V.V. (TU Delft Intensified Reaction and Separation Systems); Nijssen, Tim M.J. (Eindhoven University of Technology); Kuipers, J.R. (Eindhoven University of Technology); Padding, J.T. (TU Delft Intensified Reaction and Separation Systems)","","2018","Fluidised beds are used in a variety of processes because of their favourable mass and heat transfer characteristics. In this and many other processes, non-spherical particles are commonplace, which can drastically affect the fluidisation behaviour. In this study, we use numerical models to study non-spherical fluidisation behaviour in detail. A crucial step in the development of the numerical model is a detailed validation with experimental data. The validated model can then be used with confidence for further investigations. In this study, the results obtained from CFD-DEM modelling are compared with detailed experiments (Mahajan et al., 2017). The particles used are of spherocylindrical shape with an aspect ratio 4. We discuss the numerical modelling strategy including the DEM contact detection algorithm and accurate voidage calculation algorithm. The non-spherical single particle drag model of Hölzer and Sommerfeld (2008) is compared with a DNS drag model for spherocylindrical particles developed in-house. We propose two new voidage correction models and compare results with the (Di Felice, 1994) model. The pressure drop, bed height, particle orientation, particle circulation, stacking of particles and coordination number obtained from simulations are compared with experiments. The numerical measurements show good agreement with experiments. Similar to experiments, simulations show that rod-like particles are prone to interlocking behaviour. At high gas flow rates above the minimum fluidisation velocity, vigorously bubbling fluidisation is observed, with gas bubbles moving up through the center and particles moving down at the side walls. The orientation of particles in the fluidised state do not match with the experiments when hydrodynamic torque is neglected. The importance of hydrodynamic torque and multi-particle drag in CFD-DEM modelling of non-spherical particles is demonstrated through these results.","Bed height; CFD-DEM; Coordination number; Experiments; Fluidisation; Non-spherical; Orientation; Pressure drop; Validation","en","journal article","","","","","","","","","","","Intensified Reaction and Separation Systems","","",""
"uuid:d237cc84-ea24-4020-a7bb-f4c9944c6616","http://resolver.tudelft.nl/uuid:d237cc84-ea24-4020-a7bb-f4c9944c6616","Improving olefin purification using metal organic frameworks with open metal sites","Luna-Triguero, A. (University Pablo de Olavide); Vicent Luna, J.M. (University Pablo de Olavide); Poursaeidesfahani, A. (TU Delft Engineering Thermodynamics); Vlugt, T.J.H. (TU Delft Engineering Thermodynamics); Sánchez-De-Armas, R. (University Pablo de Olavide); Gómez-Álvarez, P. (University Pablo de Olavide; Universidad de Huelva); Calero, S. (University Pablo de Olavide)","","2018","The separation and purification of light hydrocarbons is challenging in the industry. Recently, a ZJNU-30 metal-organic framework (MOF) has been found to have the potential for adsorption-based separation of olefins and diolefins with four carbon atoms [H. M. Liu et al. Chem. - Eur. J. 2016, 22, 14988-14997]. Our study corroborates this finding but reveals Fe-MOF-74 as a more efficient candidate for the separation because of the open metal sites. We performed adsorption-based separation, transient breakthrough curves, and density functional theory calculations. This combination of techniques provides an extensive understanding of the studied system. Using this MOF, we propose a separation scheme to obtain a high-purity product.","breakthrough curves; butene isomers; coordinatively unsaturated sites; molecular simulation; separation process","en","journal article","","","","","","Accepted Author Manuscript","","2019-04-19","","","Engineering Thermodynamics","","",""
"uuid:33718e17-681f-4fb6-92ca-362f340fab45","http://resolver.tudelft.nl/uuid:33718e17-681f-4fb6-92ca-362f340fab45","A dual interface method in cylindrical coordinates for two-phase pipe flows","Oud, G.T. (TU Delft Numerical Analysis; TU Delft Fluid Mechanics)","Vuik, Cornelis (promotor); Henkes, R.A.W.M. (promotor); van der Heul, D.R. (copromotor); Delft University of Technology (degree granting institution)","2017","This research entails the numerical simulation of physical flow instabilities that can occur in two-phase pipe flows with a new efficient algorithm. The fluids are assumed to be immiscible, and the flow is incompressible and isothermal in a straight circular pipe section with a certain inclination. The numerical algorithm that was developed consists of a flow solver and a sharp interface model that solve the Navier-Stokes equations in cylindrical coordinates. The simulation results obtained with the new method are validated through comparison with other models and with experiments. The focus lies on obtaining an accurate and efficient algorithm that can ultimately be used for Direct Numerical Simulations or Large Eddy Simulations of turbulent two-phase pipe flows.","Level set method (LSM); Volume of Fluid (VOF); Mimetic finite difference method; Cylindrical coordinates; sharp interface","en","doctoral thesis","","978-94-6295-763-3","","","","","","","","","Numerical Analysis","","",""
"uuid:4cb4e5b4-f5d1-4201-81e5-d6525c82cbd8","http://resolver.tudelft.nl/uuid:4cb4e5b4-f5d1-4201-81e5-d6525c82cbd8","A kinematic wave model in Lagrangian coordinates incorporating capacity drop: Application to homogeneous road stretches and discontinuities","Yuan, K. (TU Delft Transport and Planning); Knoop, V.L. (TU Delft Transport and Planning); Hoogendoorn, S.P. (TU Delft Transport and Planning)","","2017","On freeways, congestion always leads to capacity drop. This means the queue discharge rate is lower than the pre-queue capacity. Our recent research findings indicate that the queue discharge rate increases with the speed in congestion, that is the capacity drop is strongly correlated with the congestion state. Incorporating this varying capacity drop into a kinematic wave model is essential for assessing consequences of control strategies. However, to the best of authors’ knowledge, no such a model exists. This paper fills the research gap by presenting a Lagrangian kinematic wave model. “Lagrangian” denotes that the new model is solved in Lagrangian coordinates. The new model can give capacity drops accompanying both of stop-and-go waves (on homogeneous freeway section) and standing queues (at nodes) in a network. The new model can be applied in a network operation. In this Lagrangian kinematic wave model, the queue discharge rate (or the capacity drop) is a function of vehicular speed in traffic jams. Four case studies on links as well as at lane-drop and on-ramp nodes show that the Lagrangian kinematic wave model can give capacity drops well, consistent with empirical observations.","Capacity drop; Kinematic wave model; Lagrangian coordinates; Traffic flow","en","journal article","","","","","","","","2018-09-09","","","Transport and Planning","","",""
"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:a46d4243-739e-488d-b237-8cfbe05cbdc6","http://resolver.tudelft.nl/uuid:a46d4243-739e-488d-b237-8cfbe05cbdc6","Behind the Scenes of Scenario-Based Training: Understanding Scenario Design and Requirements in High-Risk and Uncertain Environments","Noori, Nadia Saad (University of Agder); Wang, Y. (TU Delft Policy Analysis); Comes, M. (University of Agder); Lukosch, H.K. (TU Delft Policy Analysis)","","2017","Simulation exercises as a training tool for enhancing preparedness for emergency response are widely adopted in disaster management. This paper addresses current scenario design processes, proposes an alternative approach for simulation exercises and introduces a conceptual design of an adaptive scenario generator. Our work is based on a systematic literature review and observations made during TRIPLEX-2016 exercise in Farsund, Norway. The planning process and scenario selection of simulation exercises impact directly the effectiveness of intra- and interorganizational cooperation. However, collective learning goals are rarely addressed and most simulations are focused on institution-specific learning goals. Current scenario design processes are often inflexible and begin from scratch for each exercise. In our approach, we address both individual and collective learning goals and the demand to develop scenarios on different layers of organizational learning. Further, we propose a scenario generator that partly automates the scenario selection and adaptively responds to the exercise evolvement.","Humanitarian simulation exercise; scenario design process; collective learning; interorganizational coordination","en","conference paper","","","","","","","","","","","Policy Analysis","","",""
"uuid:7310152a-2209-49ca-b271-f1b3da0942ed","http://resolver.tudelft.nl/uuid:7310152a-2209-49ca-b271-f1b3da0942ed","Sharedness of team mental models in the course of design-related interaction between architects and clients","Casakin, Hernan (Ariel University); Badke-Schaub, P.G. (TU Delft OLD Design Theory and Methodology)","","2017","This study deals with the role of mental models in the coordination of team activities during design problem-solving. The work centers on the sharedness of mental models in a design team setting, mainly on the interaction between an architect and two clients. A major goal is to gain insight into how modifications in mental models affect coordination, and how sharedness develops through the process. Our focus is to explore, through a case study, the individual contributions of the architect and the clients to coordination of the work process, and how sharedness of the development of the team mental model evolves in the early stage of concept generation. Our claim is that work teams develop a certain degree of sharedness of the mental models of individual team members during information exchange. This team mental model can be insufficient or even wrong, but as long as the team members feel agreement in the team, they coordinate their work on that basis. Thus, sharedness of mental models is believed to be a powerful team asset, especially when it is reached in the earlier phases of the design process. Our findings suggest that in order to attain sharedness among design team members, design activities related to the task mental model should be encouraged, specifically the generation of new ideas and the analysis of solutions. Implications for practice and education are suggested","mental model; sharedness; coordination; architectural design; design problemsolving","en","journal article","","","","","","","","","","","OLD Design Theory and Methodology","","",""
"uuid:390947fa-87f4-45c5-9442-657263105a2e","http://resolver.tudelft.nl/uuid:390947fa-87f4-45c5-9442-657263105a2e","Coordinated Border Management Through Digital Trade Infrastructures and Trans-National Government Cooperation: The FloraHolland Case","Rukanova, B.D. (TU Delft Information and Communication Technology); Huiden, Roel (Royal FloraHolland); Tan, Y. (TU Delft Information and Communication Technology)","","2017","Digital infrastructures (DI) that support information exchange related to international trade processes (here referred to as Digital Trade Infrastructures (DTI)) have been seen as an instrument to help address the trade facilitation and security challenges. Data pipelines can be seen as an example of a DTI. Data pipelines are IT innovations that enable the timely provision of data captured at the source from different information systems available in the supply chain. Using the pipeline companies can share information with authorities and enjoy trade facilitation in return. The benefits of such data pipelines have been showcased in demonstrator settings. However, outside the controlled environment of demonstrator installations, the adoption and growth of these DTIs has been limited. The benefits based on purely implementing the data pipeline are limited. Combining data pipeline capability with Coordinated Border Management (CBM) has potential to articulate more clear benefits for stakeholders and push further investments and wider adoption. In this paper based on the FloraHolland trade lane related to exporting flowers from Kenya to the Netherlands we discuss a data pipeline/ CBM innovation. Through the conceptual lens of DI (examining architectural, process and governance dimensions) we demonstrate the potential benefits of data pipeline/ CBM innovation and the complex alignment processes between business and government actors needed for the further adoption. From a theoretical point of view we enhance the understanding regarding the governance dimension of such data pipeline/ CBM innovations by identifying four type of alignments processes involving businesses and government actors nationally and internationally. As such the paper contributes to the body of research on DI and more specifically DTI. Form a point of view of practice, the insights from our analysis can be used to better understand other data pipeline/ CBM innovation alignment processes in other domains as well.","Digital Trade Infrastructures; Data pipelines; Coordinated Border Management; Cost-benefit; International Government Collaboration; Governance","en","book chapter","Springer","","","","","","","","","","Information and Communication Technology","","",""
"uuid:285d2c6f-3a83-41f1-9085-78080ddceedb","http://resolver.tudelft.nl/uuid:285d2c6f-3a83-41f1-9085-78080ddceedb","Language Equations for Maximal Decompositions in Coordination Control","Komenda, Jan (Institute of Mathematics, Academy of Sciences of the Czech Republic); Lin, Feng (Wayne State University); van Schuppen, J.H. (TU Delft Mathematical Physics)","Dochain, D. (editor); Henrion, D. (editor); Peaucelle, D. (editor)","2017","The problem considered is to construct all solutions of an equation for a tuple of languages. The tuple in synchronous composition should equal a considered language. Of special interest are the maximal solutions with respect to a partial order relation on the set of solutions. The motivation of the problem is coordination control. The approach to the problem is to transform the equation to a fixedpoint equation. An algorithm is proposed which constructs tuples of maximal solutions by convergence of a sequence of tuples to a solution of the fixed-point equation. Modular supervisory control is shown to benefit from the proposed approach.","Discrete-event system; coordination control; convergence; automata; supervisory control","en","conference paper","Elsevier","","","","","","","","","","Mathematical Physics","","",""
"uuid:c6049c97-c213-4a51-9d9f-bb1069291b7f","http://resolver.tudelft.nl/uuid:c6049c97-c213-4a51-9d9f-bb1069291b7f","Time Series Analysis of 3D Coordinates Using Nonstochastic Observations","Velsink, H. (TU Delft Mathematical Geodesy and Positioning)","","2016","Adjustment and testing of a combination of stochastic and nonstochastic observations is applied to the deformation analysis of a time series of 3D coordinates. Nonstochastic observations are constant values that are treated as if they were observations. They are used to formulate constraints on the unknown parameters of the adjustment problem. Thus they describe deformation patterns. If deformation is absent, the epochs of the time series are supposed to be related via affine, similarity or congruence transformations. S-basis invariant testing of deformation patterns is treated. The model is experimentally validated by showing the procedure for a point set of 3D coordinates, determined from total station measurements during five epochs. The modelling of two patterns, the movement of just one point in several epochs, and of several points, is shown. Full, rank deficient covariance matrices of the 3D coordinates, resulting from free network adjustments of the total station measurements of each epoch, are used in the analysis.","3D Coordinates; Full; Geodetic Deformation Analysis; Nonstochastic Observations; S-basis Invariant Testing; Singular Covariance Matrices; Time Series","en","journal article","","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:e155b7cf-3bf7-4079-830f-1a801d49e3ca","http://resolver.tudelft.nl/uuid:e155b7cf-3bf7-4079-830f-1a801d49e3ca","BIM Implementation and Project Coordination In Design-Built Procurement","Aibinu, Ajibade A. (University of Melbourne); Papadonikolaki, E. (TU Delft Design & Construction Management)","","2016","Various procurement methods have been proposed as being more appropriate for implementing BIM. Simultaneously, BIM implementation affects the project coordination. Whereas many approaches to BIM implementation have considered integrated procurement, not all are applicable to various local markets. Particularly in the Netherlands, BIM implementation is characterized by 'ground-up' and self-regulated initiatives. This paper aims to explore and identify the relationship between design-build procurement and the emerging coordination structures from BIM. Exploratory case study research has been undertaken. The findings included two main coordination structures: centralized and decentralized. These two structures subsequently carry implications for various construction firms and their respective business models, as well as BIM implementation in general.","building information modelling; procurement; management; coordination","en","conference paper","ARCOM, Association of Researchers in Construction Management","","","","","","","","","","Design & Construction Management","","",""
"uuid:dc668d48-c94d-43a2-8bea-f3a58047904c","http://resolver.tudelft.nl/uuid:dc668d48-c94d-43a2-8bea-f3a58047904c","Quantification and Mitigation of Unfairness in Active Power Curtailment of Rooftop Photovoltaic Systems Using Sensitivity Based Coordinated Control","Latif, Aadil (AIT Austrian Institute of Technology); Gawlik, Wolfgang (Technische Universität Wien); Palensky, P. (TU Delft Intelligent Electrical Power Grids)","","2016","With increasing photovoltaic (PV) penetration in low voltage networks (LVNs), voltage regulation is a challenge. Active power curtailment (APC) is one possible solution for mitigating over voltages resulting from active power injection in LVNs. There is an inherent unfairness in the APC scheme. When generation is high and consumption is low, the voltages at the end of the feeder tend to be the highest. This results in high curtailment of active power output of the inverters located at the end of the feeder and low or even no curtailment for the inverts located closer to the transformer. A secondary voltage controller has been implemented to mitigate this unfairness in APC based voltage support schemes. The focus of this work is to quantify this unfairness and develop
methods that enable residential PV owners serviced by the same feeder to participate equally in voltage regulation in the LVN.","over-voltage; active power curtailment (APC); coordinated control; sensitivity based control","en","journal article","","","","","","This article belongs to the Special Issue Distributed Renewable Generation.","","","","","Intelligent Electrical Power Grids","","",""
"uuid:7752719b-3bb4-4711-8690-323538a002f9","http://resolver.tudelft.nl/uuid:7752719b-3bb4-4711-8690-323538a002f9","Improving situation awareness in crisis response teams: An experimental analysis of enriched information and centralized coordination","van de Walle, B.A. (TU Delft Policy Analysis); Brugghemans, Bert; Comes, M. (University of Agder)","","2016","In responding to an emergency, the actions of emergency response teams critically depend upon the situation awareness the team members have acquired. Situation awareness, and the design of systems to support it, has been a focus in recent emergency management research. In this paper, we introduce two interventions to the core processes of information processing and information sharing in emergency response teams to analyze their effect on the teams’ situation awareness: (1) we enrich raw incoming information by adding a summary of the information received, and (2) we channel all incoming information to a central coordinator who then decides upon further distribution within the team. The effect of both interventions is investigated through a controlled experiment with experienced professional responders. Our results show distinctly different effects for information enrichment and centralization, both for the teams and for the coordinators within the team. While the interaction effects of both conditions cannot be discerned, it is apparent that processing non-enriched information and non-centralized information sharing leads to a worse overall team situation awareness. Our work suggests several implications for the design of emergency response management information systems.","Coordination; Crisis response; Fast-burning crisis; Information sharing; Situation awareness","en","journal article","","","","","","","","2018-08-23","","","Policy Analysis","","",""
"uuid:31ca3f8e-64b4-40f9-b136-db52ceff2b2c","http://resolver.tudelft.nl/uuid:31ca3f8e-64b4-40f9-b136-db52ceff2b2c","Bounded acceleration capacity drop in a Lagrangian formulation of the kinematic wave model with vehicle characteristics and unconstrained overtaking","Calvert, S.C.; Snelder, M.; Taale, H.; Van Wageningen-Kessels, F.L.M.; Hoogendoorn, S.P.","","2015","In this contribution a model-based analysis of the application of bounded acceleration in traffic flow is considered as a cause for the capacity drop. This is performed in a Lagrangian formulation of the kinematic wave model with general vehicle specific characteristics. Unconstrained overtaking is presumed, which allows a demonstration to be given of the influence that constraints in traffic flow may have on the capacity drop. An experimental case demonstrates that bounded acceleration in traffic flow with unconstrained overtaking has very limited effect on the capacity drop. This implies that the capacity drop when incurred through bounded acceleration must make use of (semi-)constrained traffic flow, in which variety in vehicle acceleration ability may also be required to increase inhomogeneity. This is an important conclusion as it further defines the conditions required for capacity drop. The application of a Lagrangian formulation with advection invariant combined with bounded acceleration is also novel. The contribution further shows that the application of bounded acceleration in the presented model is feasible, although adjustments are required to capture the capacity drop through bounded acceleration.","raffic modelling; capacity drop; bounded acceleration; kinematic wave model; Lagrangian coordinates; invariant advection","en","conference paper","IEEE","","","","","","","","Civil Engineering and Geosciences","Transport and Planning","","","",""
"uuid:9b9e60bc-1edd-449a-84c6-7485d9bde012","http://resolver.tudelft.nl/uuid:9b9e60bc-1edd-449a-84c6-7485d9bde012","Open data infrastructures: The design of an infrastructure to enhance the coordination of open data use","Zuiderwijk, A.M.G.","Janssen, M.F.W.H.A. (promotor)","2015","Governments and researchers traditionally focus on the publication of Open Government Data (OGD), whereas the actual use of the data is often neglected. Open data initiatives are often criticized for not realising the promoted benefits, yet only the use of OGD can result in these benefits. OGD use requires several actors, activities and tools; however, these are fragmented and depending on each other. The OGD infrastructure presented in this dissertation aims to enhance the coordination of OGD use. Core components are an advanced and interoperable three-tier metadata model to find, analyse, visualise, interact about and assess OGD, interaction mechanisms to stimulate interaction between OGD users, OGD providers and governmental policy makers, and data quality indicators to assess the data’s fitness for use. This study is among the first to describe the design of an OGD infrastructure. This dissertation contributes to science by providing a comprehensive overview of barriers and functional requirements for OGD use from the perspective of the OGD user, by defining functional building blocks for the design of the OGD infrastructure, and by developing and evaluating a prototype of the OGD infrastructure. Furthermore, this study is the first to apply coordination theory in the field of OGD and shows that coordination of OGD use does not merely require a focus on processes, but additionally requires a technical perspective including the integration of tools, a social perspective including interaction between involved actors, and the interaction between the social and technical perspective. Moreover, while OGD infrastructures traditionally mainly provide discovery metadata, this study confirms several recent studies that different types of metadata (discovery, contextual and detailed metadata) need to be combined to improve OGD use. Finally, whereas kernel theories concerning coordination, metadata, interaction and data quality are often studied separately, this study reveals that it is essential for the development of OGD infrastructures to combine these four kernel theories.","open data; open government data; use; infrastructures; coordination; metadata; interaction; data quality","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","Engineering Systems and Services","","","",""
"uuid:24ff01b3-cb96-4a30-8ab0-1b88f65cc9c7","http://resolver.tudelft.nl/uuid:24ff01b3-cb96-4a30-8ab0-1b88f65cc9c7","Cognitive Coordination for Cooperative Multi-Robot Teamwork","Wei, C.","Jonker, C.M. (promotor)","2015","Multi-robot teams have potential advantages over a single robot. Robots in a team can serve different functionalities, so a team of robots can be more efficient, robust and reliable than a single robot. In this dissertation, we are in particular interested in human level intelligent multi-robot teams. Social deliberation should be taken into consideration in such a multi-robot system, which requires that the robots are capable of generating long term plans to achieve a global or team goal, rather than just dealing with the problems at hand. Robots in a team have to cope with dynamic environments due to the presence of the others. Thus, a robot cannot foresee what its environment will be because other robots may change the environment. Moreover, multiple robots may interfere with each other. We can say that the need for coordination in a robot team stems from interdependence relationships between the robots. More specifically, one robot performing an activity may influence another robot's activity. In order to achieve good team performance, the robots in a team all need to well coordinate their activities. This dissertation studies the multi-robot teamwork in the context of search and retrieval, which is known as foraging in robotics. In a foraging task, a team of robots is required to search targets of interest in the environment and also deliver them back to a home base. Many practical applications require search and retrieval such as urban search and rescue robots, deep-sea mining robots, and autonomous warehouse robots. Requiring both searching and delivering makes a foraging task more complicated than a pure searching, exploration or coverage task. Foraging robots have to consider not only where to explore but also when to explore. Coordination for a foraging task concerns how to direct the movements of the robots and how to distribute the workload more evenly in a team. In this dissertation, we first proposed an agent-based cognitive robot architecture that is used to bridge the gap between low-level robotic control with high-level cognitive reasoning. Cognitive agents realized by means of the agent programming language GOAL are used to control both real and simulated robots. We carried out an empirical study to investigate the role of communication and its impact on team performance. The results and findings were used to study the multi-robot pathfinding and multi-robot task allocation problems. A novel fully decentralized approach was proposed to deal with the multi-robot pathfinding problem, which also reduces the communication overhead, compared to usual decentralized approaches. An auction-based approach and a prediction approach were proposed to deal with the dynamic foraging task allocation problem. The difference is that the prediction approach performs better with respect to completion time, while the auction-based approach performs better with respect to travel costs. In order to facilitate the identification of interdependence relationships between the agents in the early design phase of a multi-agent system, we developed a formal domain-independent graphical language that reflects the need for coordination in multi-agent teamwork.","multi-agent/robot systems; coordination; cognitive robots; teamwork","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Intelligent Systems","","","",""
"uuid:dda90f15-f0e1-4739-8746-d0eba91d92f7","http://resolver.tudelft.nl/uuid:dda90f15-f0e1-4739-8746-d0eba91d92f7","Participatory Demand-supply Systems","Rezaee, S.A.; Oey, M.A.; Nevejan, C.I.M.; Brazier, F.M.","","2015","Introducing the notion of Participatory Demand-Supply (PDS) systems as socio-technical systems, this paper focuses on a new approach to coordinating demand and supply in dynamic environments. A participatory approach to demand and supply provides a new frame of reference for system design, for which the engagement of all stakeholders plays an important role, as does distributed ICT. This approach has been applied to an industrial case to explore new opportunities enabled by distributed ICT for communication, negotiation, joint decision-making, and collective learning required for coordinating demand and supply. The application results in a platform as a test-bed for collecting relevant information to study the participation of stakeholders (actors) in coordinating a PDS system.","Demand-Supply Systems; participatory systems; Participatory Demand-Supply Systems; coordination","en","journal article","Elsevier","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:f80e4ee9-433a-4d56-88e3-1f2f0c27e1aa","http://resolver.tudelft.nl/uuid:f80e4ee9-433a-4d56-88e3-1f2f0c27e1aa","MVMO-based approach for optimal placement and tuning of supplementary damping controller","Rueda Torres, J.L.; Gonzalez-Longatt, F.","","2015","This paper introduces an approach based on the Swarm Variant of the Mean-Variance Mapping Optimization (MVMO-S) to solve the multi-scenario formulation of the optimal placement and coordinated tuning of power system supplementary damping controllers (POCDCs). The effectiveness of the approach is evaluated based on the classical IEEE 39-bus (New England) test system. Numerical results include performance comparisons with other metaheuristic optimization techniques, namely, comprehensive learning particle swarm optimization (CLPSO), genetic algorithm with multi-parent crossover (GA-MPC), differential evolution DE algorithm with adaptive crossover operator, linearized biogeography-based optimization with reinitialization (LBBO), and covariance matrix adaptation evolution strategy (CMA-ES).","coordinated control; damping controllers; metaheuristics; small-signal stability","en","journal article","Engg Journals Publications","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Electrical Sustainable Energy","","","",""
"uuid:f42446bc-a2c4-477b-8b04-cf4bc7c5d91f","http://resolver.tudelft.nl/uuid:f42446bc-a2c4-477b-8b04-cf4bc7c5d91f","Supporting developers' coordination in the IDE","Guzzi, A.; Bacchelli, A. (TU Delft Software Engineering); Riche, Yann (Microsoft); van Deursen, A. (TU Delft Software Technology)","","2015","Teamwork in software engineering is time-consuming and problematic. In this paper, we explore how to better support developers' collaboration in teamwork, focusing on the software implementation phase happening in the integrated development environment (IDE). Conducting a qualitative investigation, we learn that developers' teamwork needs mostly regard coordination, rather than concurrent work on the same (sub)task, and that developers successfully deal with scenarios considered problematic in literature, but they have problems dealing with breaking changes made by peers on the same project. We derive implications and recommendations. Based on one of the latter, we analyze the current IDE support for receiving code changes, finding that historical information is neither visible nor easily accessible. Consequently, we devise and qualitatively evaluate BELLEVUE, the design of an IDE extension to make received changes always visible and code history accessible in the editor.","Developers' coordination; IDE extension; Qualitative study.","en","conference paper","Association for Computing Machinery (ACM)","","","","","","","","","Software Technology","Software Engineering","","",""
"uuid:3aebb1f4-93e7-43b3-8b33-58f7f6f8478d","http://resolver.tudelft.nl/uuid:3aebb1f4-93e7-43b3-8b33-58f7f6f8478d","From networks to hybrids: Strategic behaviour and crisis-driven change in the regulation and governance of the European financial and economic system,","Groenleer, M.L.P.; Mijs, A.; Ten Heuvelhof, E.F.; Meeuwen, B.; Van der Puil, J.","","2014","A key challenge that European decision-makers struggle with today is regulating and governing the European financial and economic system in a way that is both effective and legitimate. To help address this challenge, this paper asks why regulatory gaps occurred and European governance has been weak, and how these gaps and weaknesses allowed risky behaviour. It then scrutinizes the regulatory governance structures that have emerged in response, particularly at the EU level, to coordinate the financial and economic system. Two illustrative cases are examined: self- regulation by and national supervision of banks and ‘decentred’ fiscal policy coordination by eurozone countries. We point to strategic behaviour as a key driver of the crisis. We also argue that changes in regulatory governance to curb such behaviour have entailed introduction of some form of hierarchy at the supranational level, yet still combined with strong network characteristics, thus creating or strengthening hybridity in regulatory governance.","agencies; coordination and decision-making processes; financial and economic system; governance; hierarchies; hybrids; networks; (self-)regulation; strategic behaviour","en","journal article","The Hebrew University","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:c87e196a-97dd-4ce5-ae36-e57af3ab1275","http://resolver.tudelft.nl/uuid:c87e196a-97dd-4ce5-ae36-e57af3ab1275","Initial Analysis of the Second FIG 3D Cadastres Questionnaire: Status in 2014 and Expectations for 2018","van Oosterom, Peter; Stoter, Jantien; Ploeger, Hendrik; Lemmen, Christiaan; Thompson, Rod; Karki, Sudarshan","","2014","In this paper we present the initial analysis of the second FIG 3D Cadastres questionnaire, spanning the years 2014-2018. The first version of the 3D Cadastres questionnaire was conducted in 2010 and collected the status of 2010 and the expectations or ambitions for 2014. Most of the FIG 3D Cadastres working group members had completed the 2010 questionnaire. Four years after the first questionnaire, the second FIG 3D Cadastres questionnaire has been disseminated. All members of the FIG 3D Cadastres working group were requested to complete before 1 October 2014 the second questionnaire in order to create an inventory of the 2014 status (and expectations for 2018). In total 31 completed questionnaires have been received by time of conducting the initial analysis as described in this paper. Similar to the first questionnaire, it is likely that there will be some completed questionnaires that will arrive later. As several new countries participated in the second questionnaire, it can be concluded that the interest is further growing. From the completed questionnaires 2014-2018, it can further be concluded that there has been significant progress on nearly all aspects of 3D Cadastres: legislation, initial registration of 3D parcels, 3D cadastral data management, and dissemination. Of course, there is quite a large difference between the individual countries: ranging from no progress to realizing a full implementation of 3D Cadastre during the last 4 years.","Dissemination; 3D Cadastres; Questionnaire; 3D Real-world; Z Coordinates/Height Representation; Temporal Data; RRRs (Rights, Restrictions and Responsibilities); Cadastral Database; Survey Plans","en","conference paper","","","","","","","","","","","","","",""
"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:b2686ad8-237c-4d3a-bd78-3c5c35f70f56","http://resolver.tudelft.nl/uuid:b2686ad8-237c-4d3a-bd78-3c5c35f70f56","Accurate vertical profiles of turbulent flow in z-layer models","Platzek, F.W.; Stelling, G.S.; Jankowski, J.A.; Pietrzak, J.D.","","2014","Three-dimensional hydrodynamic z-layer models, which are used for simulating the flow in rivers, estuaries, and oceans, suffer from an inaccurate and often discontinuous bottom shear stress representation, due to the staircase bottom. We analyze the governing equations and clearly show the cause of the inaccuracies. Based on the analysis, we present a new method that significantly reduces the errors and the grid dependency of the results. The method consists of a near-bed layer-remapping and a modified near-bed discretization of the k???? turbulence model. We demonstrate the applicability of the approach for uniform channel flow, using a schematized two-dimensional vertical model and for the flow over a bottom sill using the Delft3D modeling system.","hydrodynamics; boundary layer flow; z-coordinates; discretization errors; k-epsilon turbulence; staircase problem","en","journal article","American Geophysical Union","","","","","","","2014-09-11","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:538d22b0-4a30-45af-8b7c-920f290559f4","http://resolver.tudelft.nl/uuid:538d22b0-4a30-45af-8b7c-920f290559f4","Protein metal complexes as reversible sacrificial bonds in self-healing biopolymers","Schmitt, C.N.Z.; Politi, Y.; Fratzl, P.; Harrington, M.J.","","2013","Abstract only.","biomaterials; self-healing; metal coordination; Raman; EXAFS","en","conference paper","","","","","","","","","","","","","",""
"uuid:5aa68671-676c-4c7d-ba1f-0c223dd1fb03","http://resolver.tudelft.nl/uuid:5aa68671-676c-4c7d-ba1f-0c223dd1fb03","Semi-crystalline framework provides elastic recovery in self-healing biological fibers","Krauss, S.; Metzger, H.; Fratzl, P.; Harrington, M.J.","","2013","Abstract only.","bio-inspiration; metal coordination; SAXS; molecular healing","en","conference paper","","","","","","","","","","","","","",""
"uuid:fc5280fd-27d9-41e1-9b5a-2bc146f1c5ef","http://resolver.tudelft.nl/uuid:fc5280fd-27d9-41e1-9b5a-2bc146f1c5ef","Coordinated Multi-Agent Planning and Scheduling","Steenhuisen, J.R.","Witteveen, C. (promotor)","2013","","coordination; planning; scheduling","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Computer Science","","","",""
"uuid:492b1dbd-e735-4ac8-a025-bae4a3a42d5e","http://resolver.tudelft.nl/uuid:492b1dbd-e735-4ac8-a025-bae4a3a42d5e","Intention-Aware Routing to Minimise Delays at Electric Vehicle Charging Stations","De Weerdt, M.M.; Gerding, E.H.; Stein, S.; Robu, V.; Jennings, N.R.","","2013","En-route charging stations allow electric vehicles to greatly extend their range. However, as a full charge takes a considerable amount of time, there may be significant waiting times at peak hours. To address this problem, we propose a novel navigation system, which communicates its intentions (i.e., routing policies) to other drivers. Using these intentions, our system accurately predicts congestion at charging stations and suggests the most efficient route to its user. We achieve this by extending existing time-dependent stochastic routing algorithms to include the battery's state of charge and charging stations. Furthermore, we describe a novel technique for combining historical information with agent intentions to predict the queues at charging stations. Through simulations we show that our system leads to a significant increase in utility compared to existing approaches that do not explicitly model waiting times or use intentions, in some cases reducing waiting times by over 80% and achieving near-optimal overall journey times.","multi-agent planning; computational sustainability; coordination and collaboration; multi-agent systems; energy; shortest-path planning","en","conference paper","AAAI Press","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software and Computer Technology","","","",""
"uuid:cc1f8e6d-8c86-4b20-98bc-29159a9386ba","http://resolver.tudelft.nl/uuid:cc1f8e6d-8c86-4b20-98bc-29159a9386ba","Lagrangian Multi-Class Traffic State Estimation","Yuan, Y.","Hoogendoorn, S.P. (promotor)","2013","Road traffic is important to everybody in the world. People travel and commute everyday. For those who travel by cars (or other types of road vehicles), traffic congestion is a daily experience. One essential goal of traffic researchers is to reduce traffic congestion and to improve the whole traffic system operation and the environment. To achieve this goal, we have to first understand prevailing traffic situations, then perform pro-active traffic control and management. The estimation of traffic states in the past, in the present and in the future plays an important role in traffic management and control systems. This thesis focuses on the development of traffic state estimation approaches, which provide such traffic state information. In road networks, traffic states refer to typical quantities, such as travel times, traffic speeds, traffic flow and density. These quantities reflect the traffic conditions. Based on these data, we are able to find out when a traffic jam starts, or where a traffic accident occurs. However, it is not feasible to get the full picture of traffic states from the current monitoring systems. Due to cost and technical constraints, we can only obtain spatially and temporally discretised traffic data. These traffic data are collected mainly from point-based sensors, such as inductive loops, radars, and cameras. Alternatively, traffic information might be observed by probe vehicles with a selected penetration rate. In all cases, the detected data usually contain errors and noise, which might hinder further analyses. Based on these constraints, this thesis aims to develop a traffic state estimation procedure to solve the foregoing problems and to provide accurate and complete traffic state information. In this procedure, both traffic flow models and the available observation data are used to estimate the most probable traffic states within a data-assimilation framework. Our approach is formulated using a moving observer perspective, resulting in a Lagrangian formulation of traffic state estimation. In the Lagrangian coordinate system, coordinates move with the vehicles. The Lagrangian formulated first-order traffic flow model is applied to describe the evolution of traffic state variables. The proposed Lagrangian formulation of traffic state estimation offers both theoretical and computational advantages over the conventional Eulerian formation. Moreover, this approach can capture the dynamics of multiple vehicle classes by implementing a multi-class traffic flow model. In this thesis, data pre-processing methods are also developed to improve the quality of the observation inputs. Both Eulerian and Lagrangian sensing data are incorporated into the state estimation. The online technique, known as the Extended Kalman Filter (EKF), is applied for data assimilation: this combines traffic model prediction with observation input correction. Importantly, the Lagrangian concept is not restricted to the EKF method with the first-order traffic flow model, but can also be applied to other data-assimilation techniques in combination with more involved macroscopic traffic flow models. A series of experimental studies based on both synthetic and real-world data have been performed to test the proposed methodology. These studies have validated both the mixed-class and the multi-class traffic state estimation methods. The results have demonstrated that the Lagrangian traffic state estimation outperforms the Eulerian approaches in the EKF-based framework, and the multi-class approach further improves the performance of state estimation compared with the mixed-class case. In summary, Lagrangian multi-class state estimation can provide accurate class-specific traffic information for class-specific control applications and traffic management.","traffic state estimation; Lagrangian coordinates; multi-class modelling; dynamic traffic management","en","doctoral thesis","TRAIL Research School","","","","","","","","Civil Engineering and Geosciences","Transport & Planning","","","",""
"uuid:e7ed020a-ee53-4010-a14c-4db3ae31a01b","http://resolver.tudelft.nl/uuid:e7ed020a-ee53-4010-a14c-4db3ae31a01b","Coordinating autonomous planning and scheduling","Yadati Narasimha, C.","Witteveen, C. (promotor)","2013","","coordination; scheduling; planning; decomposition","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:6e60680b-7e07-4f1d-9240-1ed5453022ee","http://resolver.tudelft.nl/uuid:6e60680b-7e07-4f1d-9240-1ed5453022ee","Renewable Energy for Electric Vehicles: Price Based Charging Coordination","Richstein, J.C.; Schuller, A.; Dinther, C.; Ketter, W.; Weinhardt, C.","","2012","In this paper we investigate the charging coordination of battery electric vehicles (BEV) with respect to the availability of intermittent renewable energy generation considering individual real world driving profiles in a deterministic simulation based analysis, mapping a part of the German power system in 2009. We propose a price based charging approach, initiated by an aggregator, which combines numerous BEVs in his fleet in order to optimize the utilization of energy from renewable sources, here wind and solar, thus offering a renewable tariff to consumers. Our results show that a price mechanism based on the availability of renewable energy and the charging availability of the BEVs combined with a voluntary reduction of the individual charging power to 1 kW, can increase the share of renewable energy charged in a year from 53 % to 75 % as compared to no charging coordination under similar conditions. An additional average cost evaluation of the proposed renewable energy tariff shows that wind power can be competitive with conventional sources at the end consumer level, while enabling considerable carbon emission reductions.","electric vehicle; charging coordination; renewable energy; aggregator","en","conference paper","","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:d7278a2c-6a58-4228-8313-5e66d733daba","http://resolver.tudelft.nl/uuid:d7278a2c-6a58-4228-8313-5e66d733daba","ePartners for Dynamic Task Allocation and Coordination","De Greef, T.","Neerincx, M. (promotor)","2012","This dissertation promotes a focus shift from automation extending human capabilities to automation partnering with the human. Highly automated systems tend to be incompatible with humans, leading to degradations in performance that may lead to serious problems in high-risk professional domains, such as the Navy and Urban Search and Rescue. This dissertation shows how an electronic partner (ePartner) can act as task allocator and coordination facilitator to substantially improve the human-automation teamwork in these high-risk professional domains. Adaptive automation concerns the dynamic allocation of tasks between the human and the automation, based on ePartner’s proposal or decision. The effects of adaptive automation using the object-oriented task model and the hybrid triggering mechanism have been investigated with Navy officers. The results revealed a large performance improvement, especially in the more complex condition. This latter finding makes adaptive automation a likely candidate to incorporate in future combat management systems as military scenarios are expected to become complex (asymmetrical) while manning reduction initiatives stress the military system. Observability displays are proposed to supports the coordination process while working in a distributed setting. A number of experimental studies have demonstrated that observability displays improve backing-up behavior, performance, and resilience while coordinating activities compared with conventional communication technologies. These results clearly show the power of observability displays as a mean to support the team process between human actors and have the potential to support Urban Search & Rescue missions.","ePartners; Coordination Support; Human Agent Teamwork; USAR; Navy; Adaptive Automation; Distributed Operations","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Mediamatics","","","",""
"uuid:cd59aaf4-dc7d-422f-9b80-aefc93c4f703","http://resolver.tudelft.nl/uuid:cd59aaf4-dc7d-422f-9b80-aefc93c4f703","Regulation of gas infrastructure expansion","De Joode, J.","Weijnen, M.P.C. (promotor); De Vries, L.J. (promotor)","2012","The topic of this dissertation is the regulation of gas infrastructure expansion in the European Union (EU). While the gas market has been liberalised, the gas infrastructure has largely remained in the regulated domain. However, not necessarily all gas infrastructure facilities – such as gas storage facilities, LNG import terminals and certain gas transmission pipelines – need to be regulated, as there may be scope for competition. In practice, the choice of regulation of gas infrastructure expansion varies among different types of gas infrastructure facilities and across EU Member States. Based on a review of economic literature and on a series of in-depth case studies, this study explains these differences in choices of regulation from differences in policy objectives, differences in local circumstances and differences in the intrinsic characteristics of the infrastructure projects. An important conclusion is that there is potential for a larger role for competition in gas infrastructure expansion.","natural gas; regulation; infrastructure; investment; European Union; external effects; security of supply; competition; coordination","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:af4e49ad-3943-4a3f-9b91-6e233cbb21cf","http://resolver.tudelft.nl/uuid:af4e49ad-3943-4a3f-9b91-6e233cbb21cf","Incentivizing Cooperation in P2P File Sharing: Indirect Interaction as an Incentive to Seed","Noroozian, A.; De Weerdt, M.M.; Witteveen, C.","","2012","The fundamental problem with P2P networks is that quality of service depends on altruistic resource sharing by participating peers. Many peers freeride on the generosity of others. Current solutions like sharing ratio enforcement and reputation systems are complex, exploitable, inaccurate or unfair at times. The need to design scalable mechanisms that incentivize cooperation is evident. We focus on BitTorrent as the most popular P2P file sharing application and introduce an extension which we refer to as the indirect interaction mechanism (IIM). With IIM BitTorrent peers are able to barter pieces of different files (indirect interaction). We provide novel game theoretical models of BitTorrent and the IIM mechanism and demonstrate through analysis and simulations that IIM improves BitTorrent performance. We conclude that IIM is a practical solution to the fundamental problem of incentivizing cooperation in P2P networks.","Incentives for Cooperation; Peer to peer coordination","en","conference paper","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:93615a93-f777-4180-aeeb-2d862bfefd8e","http://resolver.tudelft.nl/uuid:93615a93-f777-4180-aeeb-2d862bfefd8e","Optimal inter-area coordination of train rescheduling decisions","Corman, F.; D'Ariano, A.; Pacciarelli, D.; Pranzo, M.","","2011","Railway dispatchers reschedule trains in real-time in order to limit the propagation of disturbances and to regulate traffic in their respective dispatching areas by minimizing the deviation from the off-line timetable. However, the decisions taken in one area may influence the quality and even the feasibility of train schedules in the other areas. Regional control centers coordinate the dispatchers’ work for multiple areas in order to regulate traffic at the global level and to avoid situations of global infeasibility. Differently from the dispatcher problem, the coordination activity of regional control centers is still underinvestigated, even if this activity is a key factor for effective traffic management. This paper studies the problem of coordinating several dispatchers with the objective of driving their behavior towards globally optimal solutions. With our model, a coordinator may impose constraints at the border of each dispatching area. Each dispatcher must then schedule trains in its area by producing a locally feasible solution compliant with the border constraints imposed by the coordinator. The problem faced by the coordinator is therefore a bilevel programming problem in which the variables controlled by the coordinator are the border constraints. We demonstrate that the coordinator problem can be solved to optimality with a branch and bound procedure. The coordination algorithm has been tested on a large real railway network in the Netherlands with busy traffic conditions. Our experimental results show that a proven optimal solution is frequently found for various network divisions within computation times compatible with real-time operations.","Train Delay Minimization; schedule coordination; bilevel programming","en","journal article","Elsevier","","","","","","","","Civil Engineering and Geosciences","Transport & Planning","","","",""
"uuid:221228b5-eadc-459b-a5f1-eba1ff6a0fb2","http://resolver.tudelft.nl/uuid:221228b5-eadc-459b-a5f1-eba1ff6a0fb2","Unravelling Interdependence: Coordinating Public-Private Service Networks","Klievink, B.","Tan, Y.H. (promotor)","2011","Governments aim to improve service delivery towards citizens and businesses. One of the main trends in this area is that organisations are increasingly trying to integrate service delivery by using information and communication technology (ICT). Service integration is necessary as individual service offerings are often just a part of a bigger process. This overall process does not stop at the boundaries of individual organisations, or at the boundary between the public and the private sector. Therefore, in order to improve service delivery, the service providers have to collaborate and integrate their services across organisational boundaries. The challenges that these collaborations face are varied, including heterogeneous organisations, a variety of processes, and fragmented information systems. How can we deal with these challenges to realise integrated service delivery? It is this question that is the background of this dissertation. It is addressed by exploring the interdependence in integrated service delivery, provided by networks of public and private organisations. Ultimately, the dissertation improves the understanding of the coordination of such public-private service networks.","public-private service delivery; coordination; integrated service delivery; e-government","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","Infrastructure Systems & Services","","","",""
"uuid:a7011d1b-8eb5-48a7-9d0c-94329768c800","http://resolver.tudelft.nl/uuid:a7011d1b-8eb5-48a7-9d0c-94329768c800","Service Composition: A Method for Developing Compositions in a Multi-actor Context","Feenstra, R.","Tan, Y.H. (promotor); Janssen, M.F.W.H.A. (promotor)","2011","","service composition; service portfolio; dependencies; coordination; service composition design methods","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","Infrastructures, Systems and Services","","","",""
"uuid:8f6dfa30-e8bb-46a1-ac00-72be27222f7f","http://resolver.tudelft.nl/uuid:8f6dfa30-e8bb-46a1-ac00-72be27222f7f","GPS position time-series analysis based on asymptotic normality of M-estimation","Khodabandeh, A.; Amiri-Simkooei, A.R.; Sharifi, M.A.","","2011","The efficacy of robust M-estimators is a well-known issue when dealing with observational blunders. When the number of observations is considerably large—long time series for instance—one can take advantage of the asymptotic normality of the M-estimation and compute reasonable estimates for the unknown parameters of interest. A few leading M-estimators have been employed to identify the most likely functional model for GPS coordinate time series. This includes the simultaneous detection of periodic patterns and offsets in the GPS time series. Estimates of white noise, flicker noise, and random walk noise components are also achieved using the robust M-estimators of (co)variance components, developed in the framework of the least-squares variance component estimation (LS-VCE) theory. The method allows one to compute confidence interval for the (co)variance components in asymptotic sense. Simulated time series using white noise plus flicker noise show that the estimates of random walk noise fluctuate more than those of flicker noise for different M-estimators. This is because random walk noise is not an appropriate noise structure for the series. The same phenomenon is observed using the results of real GPS time series, which implies that the combination of white plus flicker noise is well described for GPS time series. Some of the estimated noise components of LS-VCE differ significantly from those of other M- estimators. This reveals that there are a large number of outliers in the series. This conclusion is also affirmed by performing the statistical tests, which detect (large) parts of the outliers but can also leave parts to be undetected.","M-estimation; least squares variance component estimation (LS-VCE); robust variance component estimation; GPS coordinate time series; asymptotic normality","en","journal article","Springer","","","","","","","","Aerospace Engineering","Remote Sensing","","","",""
"uuid:7a2d7332-2e12-447a-9f20-34809fa8aad6","http://resolver.tudelft.nl/uuid:7a2d7332-2e12-447a-9f20-34809fa8aad6","Efficient model predictive control for large-scale urban traffic networks","Lin, S.","De Schutter, B. (promotor); Hellendoorn, J. (promotor); Xi, Y. (promotor)","2011","Model Predictive Control is applied to control and coordinate large-scale urban traffic networks. However, due to the large scale or the nonlinear, non-convex nature of the on-line optimization problems solved, the MPC controllers become real-time infeasible in practice, even though the problem is solvable in theory. In this thesis, we mainly focus on the solutions for increasing the real-time feasibility of the MPC controllers for large-scale urban traffic networks.","urban traffic network control; coordinated traffic control; urban traffic network modelling; model predictive control","en","doctoral thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Delft Center for Systems and Control","","","",""
"uuid:7864f564-5975-4167-b71c-7b50122f0955","http://resolver.tudelft.nl/uuid:7864f564-5975-4167-b71c-7b50122f0955","Netcentric Information Orchestration: Assuring Information and System Quality in Public Safety Networks","Bharosa, N.","Tan, Y.H. (promotor); Janssen, M.F.W.H.A. (promotor)","2011","During daily operations, relief agencies such as police, fire brigade and medical services manage information in accordance with their respective processes and organization structure. When disaster strikes, the ad-hoc combinations of such hierarchy based information systems fail to assure high information quality (IQ) and system quality (SQ) for relief workers. Disaster such as 9/11, Katrina and the Polderbaan-crash have taught us that poor IQ and SQ significantly hamper disaster response efforts and can be lethal for relief workers and citizens. Drawing on empirical data (field studies) and pathways in ‘state of the art’ theories, this dissertation presents ten design principles for assuring IQ and SQ in public safety networks. These principles are the cornerstones of a design theory coined as ‘Netcentric Information Orchestration’ and are meant to guide information system architects, practitioners, software vendors and policy makers in the (re)design of information systems for disaster response. We evaluated the design principles on their technical feasibility (using prototyping) and on their ability to assure IQ and SQ for relief workers (using quasi-experimental gaming-simulation). Findings indicate that the proposed design principles assure higher levels for most IQ and SQ dimensions.","Netcentric Orchestration; Information Quality; System Quality; Disaster Response; Coordination; Public Safety Networks","en","doctoral thesis","Uitgeverij BOXpress","","","","","","","2011-01-18","Technology, Policy and Management","Information and Communication Technology","","","",""
"uuid:48d76a17-2947-4aef-b861-e8225befa1cd","http://resolver.tudelft.nl/uuid:48d76a17-2947-4aef-b861-e8225befa1cd","Centralized versus distributed systems to reschedule trains in two dispatching areas","Corman, F.; D'Ariano, A.; Pacciarelli, D.; Pranzo, M.","","2010","Railway dispatchers are in charge of rescheduling trains during operations in order to limit propagation of disturbances occurring in real-time. To help the dispatchers in such task, an advanced decision support system, ROMA (Railway traffic Optimization by Means of Alternative graphs), has been recently implemented to optimize railway traffic within a single dispatching area. This paper presents a novel distributed optimization system to control trains running in a Dutch railway network that is divided into two complex dispatching areas with dense traffic, each one controlled by a single dispatcher with the support of a local ROMA. A coordination level is introduced in order to manage the interaction among the two local ROMAs. An extensive computational assessment of the centralized and distributed systems is performed by using simple and advanced train scheduling algorithms, including dispatching rules adopted during operations. The effectiveness of the distributed system.","Railway rescheduling; Traffic optimization; Schedule coordination","en","journal article","Springer Verlag","","","","","","","","Civil Engineering and Geosciences","Transport and Planning","","","",""
"uuid:36f91f13-9dd3-4f1c-a06a-06592d0bd959","http://resolver.tudelft.nl/uuid:36f91f13-9dd3-4f1c-a06a-06592d0bd959","The Role of Technology in Distributed Team Coordination: A multi-method investigation of a technology change process in the field","Bayerl, P.S.","Lauche, K. (promotor); Badke-Schaub, P. (promotor)","2010","The goal of this project was two-fold: firstly, to add to the theoretical knowledge about the impact of complex media combinations for distributed team coordination, and secondly, to increase the practical knowledge for organizations and designers on how to design and implement complex technological solutions for the support of distributed teams. In this thesis I report the results of six empirical studies conducted in offshore oil production teams. The main theoretical contributions lay in the introduction of the concept of asymmetry and its effects on distributed team work, the reframing of IT implementation and adoption as a team-level process, the development of a model for IT adoption in distributed teams, a delineation of effects of technological versus structural means to bridge geographic distribution, and a detailed view on the processes, with which multiple technologies impact on team functioning and more specifically intra-team coordination in mature distributed teams. For organizations, the knowledge gained from this project can help anticipate effects of media choices on their distributed work force and guide decisions of technology choice and design. The valence–alignment framework introduced in this thesis further provides managers and organizations with a framework to analyze reactions of user to technology implementations and devise strategies against resistance. For designers this projects aims to raise awareness for the relevance of social inter-dependencies and dynamics for product acceptance and use, the possibility of disparate or even conflicting user requirements in multi-user contexts, and the importance of a stronger process view from initial attitudes to long-term use.","technology implementation; technology adoption; distributed teams; technology design; coordination; ICT; diversity; field study; organizational change","en","doctoral thesis","","","","","","","","","Industrial Design Engineering","Product Innovation Managment","","","",""
"uuid:47260585-5d75-4766-bb52-77c93f3a30da","http://resolver.tudelft.nl/uuid:47260585-5d75-4766-bb52-77c93f3a30da","Technology Effects in Distributed Team Coordination—High-Interdependency Tasks in Offshore Oil Production","Bayerl, P.S.; Lauche, K.","","2010","For highly interdependent yet location-specific tasks, distributed teams need to closely coordinate activities and processes. This field study in the upstream oil and gas industry focused on challenges in the coordination of highly interdependent tasks if teams work remotely on an ongoing basis. Based on 78 semi-structured interviews and observations over a period of 12 months, we identified coordination requirements for primary team activities, as well as effects of changing media capabilities to overcome difficulties of ongoing distribution. Implications for media requirements in the support of ongoing distributed teams are discussed.","computer-mediated communication; coordination; distributed teams; task interdependency","en","journal article","Springer","","","","","","","","Industrial Design Engineering","Product Innovation Management","","","",""
"uuid:82033a15-8402-4b47-b7ae-733b3a1f03ac","http://resolver.tudelft.nl/uuid:82033a15-8402-4b47-b7ae-733b3a1f03ac","Reciprocity Theorems for One-Way Wave Fields in Curvilinear Coordinate Systems","Frijlink, M.; Wapenaar, C.P.A.","","2010","One-way wave equations conveniently describe wave propagation in media with discontinuous and/or rapid variations in one direction, but with smooth and slow variations in the complementary transverse directions. In the past, reciprocity theorems have been developed in terms of one-way wave fields. The boundaries of the integration volumes and the variations of the medium parameters must adhere to strict conditions. The variations must have the smoothness required by pseudodifferential operators, while the boundaries have to be flat. To extend the applicability to nonflat boundaries, this paper formulates one-way wave equations and corresponding reciprocity theorems in terms of curvilinear coordinates of the semiorthogonal (SO) type. In SO coordinate systems, one of the covariant basis vectors is orthogonal to the others, which can be nonorthogonal among each other. The same applies to the contravariant basis vectors. Furthermore, the orthogonal directions coincide; that is, the orthogonal co- and contravariant basis vectors coincide. SO coordinates are characterized by a local property of the basis vectors. An extra specification is necessary to make them conform in any way to nonflat boundaries. This can be done in terms of so-called lateral Cartesian (LC) coordinates. Cartesian coordinates are mapped to LC coordinates by applying an invertible transformation to one coordinate while keeping the others the same. LC coordinates are a straightforward means to describe or conform to nonflat boundaries. Applications of the extended reciprocity theorems include removal of multiple reflections, removal of complex propagation effects, wave field extrapolation, and synthesis of unrecorded data.","reciprocity theorems; curvilinear coordinates; one-way wave fields","en","journal article","Society for Industrial and Applied Mathematics","","","","","","","","Civil Engineering and Geosciences","Geotechnology","","","",""
"uuid:7528c7fd-9eac-43b7-95cf-2646aef4c132","http://resolver.tudelft.nl/uuid:7528c7fd-9eac-43b7-95cf-2646aef4c132","A Framework for ICT-Supported Coordination in Crisis Response","Gonzalez, R.A.","Sol, H.G. (promotor)","2010","Crisis response efforts often require coordinating a previously unknown adhocracy of agencies under time pressure. While current technologies that support coordination are successful for well-defined static process descriptions, they may fall short in the face of more complex and unpredictable scenarios, such as a crisis or emergency. Using design science research, this thesis contributes a set of design artifacts that are used to gain insight into coordination in crisis response and its support with information and communication technology (ICT). A simulation model, together with the constructs, methods and design models that went into its development, was built for this purpose. The simulation model operationalizes constructs from the information-processing view of coordination in crisis response, using an agent-based representation that enables experimenting with both mediated as well as mutually adjusted coordination mechanisms for a crisis response organization in a specific crisis scenario. Findings indicate that coordination in crisis response emerges through the interaction between different coordination mechanisms and that simulation can be used to enable a comparison between them and to assess the potential effect of using ICT.","coordination; crisis response; agent-based simulation; design science research; information systems","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"uuid:f272117c-e1b5-4ae6-96cb-aa86fe62a015","http://resolver.tudelft.nl/uuid:f272117c-e1b5-4ae6-96cb-aa86fe62a015","Overview of Methods for Multi-Level and/or Multi-Disciplinary Optimization","De Wit, A.J.; Van Keulen, A.","","2010","Multi-level optimization and multi-disciplinary optimization are areas of research that are concerned with developing efficient analysis and optimization techniques for complex systems that are made up of coupled elements (components). Within the field of multilevel optimization and multi-disciplinary optimization a large number of techniques have been developed for efficient analysis and optimization of complex systems. This paper presents an unified overview of main stream approaches that were found in the literature. Four general steps are distinguished in both multi-level optimization and multi-disciplinary optimization: physical coupling, optimization problem coupling, coordination and solution sequence. Via these four steps approaches are classified and possibilities for combining aspects of different methods are given. Finally, advantages and disadvantages of approaches applied to engineering problems are discussed and directions for further research are given.","multi-level; multi-disciplinary; optimization; decomposition; coordination; overview","en","conference paper","American Institute of Aeronautics and Astronautics (AIAA)","","","","","","","","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:e54870ba-7db7-41cd-86f1-97c485500b34","http://resolver.tudelft.nl/uuid:e54870ba-7db7-41cd-86f1-97c485500b34","Computational Modelling of Particle Packing in Concrete","He, H.","Sluys, L.J. (promotor)","2010","Physical particle packing is becoming a hot topic in concrete technology as more and more types of granular materials are used in concrete either for ecological or for engineering purposes. Although various analytical methods have been developed for optimum mixture design, comprehensive information on particle packing properties is still missing, e.g. on the impact of the packing method on such properties. Computer simulation therefore provides a promising perspective for particle packing simulation. However, developing flexible algorithms for simulation of arbitrary shaped particle packing still remains a challenge for concrete researches. This study aim offers a solution for these problems. The strategy of simulating particles of arbitrary shape is based on an experimental approach to this problem. The simulation strategies are thereupon implemented into a DEM-based dynamic concurrent algorithm-based simulation (CAS) approach for particle packing. Finally, influences of particle shape, particle size and packing method on packing density are evaluated and discussed. This methodology renders possible producing virtual concrete on meso-level. In combination with FEM, the influence of particle packing on mechanical properties of concrete has been assessed in this way. In the same way the simulation of cement particle packing can be realized on micro-level. Upon simulation of hydration, the capacity of self-healing of cracks due to unhydrated cement is assessed by a DEM-based simulation system for different cement types and packing densities.","particle packing; image analysis; DEM; packing density; coordination number; FEM; the Youngs modulus; Fracture behaviour; self-healing","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","Design and Construction - Section of Materials and Environment (M&E) and Section of Structural Mechanics","","","",""
"uuid:ef31a5af-4b47-4126-9157-02b1963cdccc","http://resolver.tudelft.nl/uuid:ef31a5af-4b47-4126-9157-02b1963cdccc","Coordination concepts for ramp metering control in a freeway network","Yuan, Y.; Daamen, W.; Hoogendoorn, S.; Vrancken, D.","","2010","The steadily increasing numbers and lengths of traffic jams on freeways have led to the application of Dynamic Traffic Management (DTM) measures all over the world. Ramp metering control has proven to be one of the most efficient means to reduce freeway congestion. Currently, it is expected that integrated and coordinated application of DTM measures will further improve its impact. This paper studies a coordinated ramp metering control algorithm called HERO/RWS. This algorithm has been developed for the current Dutch ramp metering systems and it will be applied on the Amsterdam A10 freeway network in the near future. The aim of this algorithm is to postpone congestion on freeways by effectively using ramp storage space from upstream on-ramps. VISSIM-based microscopic simulation results show that the HERO/RWS coordinated control outperforms noncoordinated ramp metering control. Parameter settings have been optimized for the specific A10-west network through a robustness study. In addition, the concept of coordination between ramp meter and upstream intersection traffic controllers is developed. The feasibility of this idea has been proven by a simulation study.","HERO/RWS ramp metering coordination algorithm; upstream intersection coordination; Amsterdam A10 beltway; microscopic simulation","en","conference paper","IFAC","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:cc0ddc3e-4f47-4426-93d6-ce599af0645e","http://resolver.tudelft.nl/uuid:cc0ddc3e-4f47-4426-93d6-ce599af0645e","Leadership for Distributed Teams","De Rooij, J.P.G.","Andriessen, J.H.T.H. (promotor); Den Hartog, D.N. (promotor)","2009","The aim of this dissertation was to study the little examined, yet important issue of leadership for distributed teams. Distributed teams are defined as: “teams of which members are geographically distributed and are therefore working predominantly via mediated communication means on an interdependent task and in realizing a joint goal” (adapted from Bell & Kozlowski, 2002 and Dubé & Paré, 2004). Chapter 1 first presents the outline of the dissertation. Next, several characteristics of distributed teams are discussed. These characteristics render team processes more difficult. Because theory on management and leadership is based mostly on research in conventional (co-located) organizations there is a need to address leadership in distributed teams. The dissertation aims do this by answering the question: “What is effective leadership for distributed teams?” In chapter 1, several developments, which have lead to the increased use of distributed teams in organizations are discussed. One of these developments is considered an enabler (ICT developments), while others are considered drivers (e.g. globalisation, cost reduction, business continuity, flexibility and using networks of expertise). In the discussion of these developments, some examples of distributed teams that have emerged in organizations are presented. In the second part of Chapter 1, a body of literature on leadership for distributed teams is reviewed. First, based on practitioner oriented sources, some tasks, roles and responsibilities of leaders of distributed teams are discussed. This is followed by a review of findings of empirical studied aimed at leadership in distributed teams. The chapter concludes that empirical research aimed at leadership in distributed teams has been scarce, particularly when it comes to field studies. It also concludes that transformational leadership seems promising for distributed teams, as it is associated with favourable team outcomes. Findings from the normative literature and explorative studies have not been integrated in quantitative field studies. For field studies of leadership in distributed teams a hybrid approach, which combines existing leadership theory with new leadership concepts, while incorporating team context systematically, is proposed. In Chapter 2, findings of an explorative study (study 1) are reported. The main purpose of study 1 was to investigate the challenges associated with characteristics of distributed teams, as well as leadership actions and behaviours to overcome these challenges. Four questions were posed at the beginning of this study: 1. “How do leaders from distributed teams in organizations perceive the impact of geographic distribution, mediated communication, time dispersion and cultural differences on distributed team work?” 2. “What are the most important challenges with distributed team work, as perceived by distributed team leaders?” 3. “What, according to leaders, are effective leader behaviors to overcome these challenges?” 4. “What can we learn from this first study in terms of promising areas for research?” For this study a series of semi-structured interviews (n=50) with team leaders of distributed teams from nine different multinational organizations was held. Before the interviews, information about the team’s tasks and management structures was gathered by means of a short on-line questionnaire (see Appendix II). For the purpose of these interviews a general interview script was designed (see Appendix III). Leaders were asked how they experienced characteristics of their distributed teams as influencing their team and their role as leaders. All interviews were recorded, transcribed and then analyzed with a program that supports analysis of unstructured data (Atlasti). In this process a codebook was generated (see appendix IV). The second part of Chapter 2 presents several types of distributed teams, as well as the results of the study in the following order: geographic distribution, mediated communication, time differences and cultural diversity. Respondents indicated that geographic distance lead to complex team structures and the emergence of sub-teams. Mediated communication leads to a lack of visual cues, a lack of awareness and a lack of informal encounters. Few problems were reported as a result of time differences, although the planning of meetings was sometimes difficult. Cultural diversity was mentioned to lead to differences in communication styles, to language problems and to differences in hierarchy perception. From the results of study 1, two major challenges emerged (1) development of effective working relationships and (2) development of shared understanding. The third part of Chapter 2, presents a list of leadership actions and behaviours that were mentioned as useful for leaders of distributed teams, particularly to overcome the two challenges. Leadership in distributed teams was found typical in its active component. Five general focus areas for distributed team leadership were identified: (1) facilitating awareness, (2) developing an effective communication climate (3) motivating members, (4) formalizing and structuring and (5) focusing on the team as a whole. Chapter 3 presents the development of a research model. First, literature is discussed on the specific elements of the context of distributed teams and the extensive debate that has taken place. Research findings of the impact of team characteristics on team processes and outcomes are presented, followed by a presentation of theoretical concepts related to the two challenges derived from Study 1, i.e. the development of effective working relationships, and the development of shared understanding. In the third part of the chapter a research model is presented. It contains a number of hypotheses about the relationships between leadership approaches, i.e. transactional, transformational leadership and distance leadership, team processes, i.e. shared understanding and trust in the knowledge of team colleagues, and outcomes, i.e. team performance and innovative behaviour. The model displays associations between leadership and team outcomes, which are mediated by team processes. Two team characteristics, i.e. geographic dispersion and team members specialization, are expected to moderate the relationships of leadership with team processes. Chapter 4 reports study 2. This is a quantitative field study aimed to test the hypotheses presented in Chapter 3 in three steps: (1) the relationship between leadership behaviors, innovative behavior and team performance, (2) the mediating roles of shared understanding and trust in the knowledge of team colleagues in these associations and (3) the moderating roles of geographic distance and specialization in the association between leadership, shared understanding and trust in the knowledge of team colleagues. The study took place in 35 distributed teams which were working in innovative and technological disciplines. The teams originated from 8 different organizations involved in the (management of) development of technology. The study used mostly existing measurement scales for the variables under study. Aggregation of the individual level data to the team level was problematic for some variables and therefore most analyses were performed at the individual level. To test hypotheses, mediated and moderated regression analyses were performed, supported by SPSS. Results of this study provide support for transformational and distance leadership to influence team processes and outcomes in distributed teams. Shared understanding mediated the association of transformational and distance leadership with innovative behaviour and team performance. Partial mediation was found in most cases and full mediation occurred for the association between distance leadership and team performance. Trust in the knowledge of team colleagues was found to partially mediate the relationship between leadership styles and team performance, however, trust did not mediate the relationship of the leadership styles with innovative behaviour. Contrary to expectations, in study 2 no support was found for the moderating role of geographic distribution in associations of leadership with team processes, i.e. shared understanding, and trust in the knowledge of team colleagues. Specialization of knowledge was found to moderate the association of transformational leadership with shared understanding. In Chapter 5 theoretical and empirical findings are discussed and integrated. After an introduction, first the role of transformational leadership at a distance is discussed. Transformational leadership was found the strongest predictor of shared understanding, trust and team outcomes. Surprisingly, the degree of geographic dispersion did not moderate the impact of leadership on team processes, whereas a recent study by Joshi and colleagues (2009) did find this effect. Next, the importance of shared understanding and trust for team effectiveness is discussed. Shared understanding was found to be a challenge for distributed teams and to be an important mechanism to reach team performance. Surprisingly it received relatively little research attention in distributed teams. Some measurement issues are discussed, particularly in the case of field studies. The role of trust is important for team performance, but less important for innovative behaviour. Suggestions to develop shared understanding and trust in distributed teams are discussed. Next, the attention is focused to how distributed teams are (un)like conventional colocated teams. It is concluded that distributed teams are in many respects different from conventional teams, which renders these teams to be less ‘teamy’. Several team characteristics are discussed with regard to their effects on the ‘teamness’ of distributed teams, as well as several approaches to study the effects of these characteristics. Next, the practical implications of the studies reported in this dissertation are discussed in three areas, i.e. selection and development of team leaders, the role of face-to-face meetings and the use of ‘richer’ technology for development of shared understanding, and the characteristics to look for in members of distributed teams. Finally, a reflection on the results is presented followed by suggestions for further research in four domains, i.e. further exploring the effects of the distributed team context, further exploring and analysing the value of distance leadership behaviours, exploring the different domains of shared understanding, and investigating the development of shared understanding over time.","Leadership; Distributed teams; Virtual teams; New work forms; Coordination; International teams; Mediated communication; Virtuele teams; Het nieuwe werken; Leiderschap","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","Organizatioanl Behaviour and Innovation","","","",""
"uuid:d8f58668-ba49-441d-bbf0-aa8c7114da4a","http://resolver.tudelft.nl/uuid:d8f58668-ba49-441d-bbf0-aa8c7114da4a","A Unified Approach towards Decomposition and Coordination for Multi-level Optimization","De Wit, A.J.","Van Keulen, A. (promotor)","2009","Complex systems, such as those encountered in aerospace engineering, can typically be considered as a hierarchy of individual coupled elements. This hierarchy is reflected in the analysis techniques that are used to analyze the physcial characteristics of the system. Consequently, a hierarchy of coupled models is to be used, accounting for different physical scales, components and/or disciplines. Numerical optimization of complex systems with embedded hierarchy is accomplished via multi-level optimization methods. Multi-level optimization methods utilize the hierarchical nature of complex systems to distribute the optimization process into smaller coupled less complex optimization problems located at the individual elements of the hierarchy. The present thesis presents a generalized approach towards decomposition and coordination for the numerical optimization of complex systems with embedded hierarchy. The developed methods are applied to numericaly maximizing the range of a supersonic business jet via multi-level optimization considering coupling between multiple engineering disciplines.","multi-level; multi-disciplinary; optimization; decomposition; coordination","en","doctoral thesis","","","","","","","","2009-11-30","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:ab049f2e-fabd-42e1-8bd0-e4b9e8a396b6","http://resolver.tudelft.nl/uuid:ab049f2e-fabd-42e1-8bd0-e4b9e8a396b6","Crisis response simulation combining discrete-event and agent-based modeling","Gonzalez, R.A.","","2009","This paper presents a crisis response simulation model architecture combining a discrete-event simulation (DES) environment for a crisis scenario with an agent-based model of the response organization. In multi-agent systems (MAS) as a computational organization, agents are modeled and implemented separately from the environmental model. We follow this perspective and submit an architecture in which the environment is modeled as a discreteevent simulation, and the crisis response agents are modeled as a multi-agent system. The simultaneous integration and separation of both models allows for independent modifications of the response organization and the scenario, resulting in a testbed that allows testing different organizations to respond to the same scenario or different emergencies for the same organization. It also provides a high-level architecture suggesting the way in which DES and MAS can be combined into a single simulation in a simple way.","multi-agent systems; discrete-event simulation; coordination; crisis response","en","conference paper","ISCRAM","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","","",""
"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:a31d9d87-fd5d-460b-996d-0298fca22353","http://resolver.tudelft.nl/uuid:a31d9d87-fd5d-460b-996d-0298fca22353","Coordination by design and the price of autonomy","Ter Mors, A.W.; Yadati, C.; Witteveen, C.; Zhang, Y.","","2009","We consider a multi-agent planning problem as a set of activities that has to be planned by several autonomous agents. In general, due to the possible dependencies between the agents’ activities or interactions during execution of those activities, allowing agents to plan individually may lead to a very inefficient or even infeasible solution to the multi-agent planning problem. This is exactly where plan coordination methods come into play. In this paper, we aim at the development of coordination by design techniques that (i) let each agent construct its plan completely independent of the others while (ii) guaranteeing that the joint combination of their plans always is coordinated. The contribution of this paper is twofold. Firstly, instead of focusing only on the feasibility of the resulting plans, we will investigate the additional costs incurred by the coordination by design method, that means, we propose to take into account the price of autonomy: the ratio of the costs of a solution obtained by coordinating selfish agents versus the costs of an optimal solution. Secondly, we will point out that in general there exist at least two ways to achieve coordination by design: one called concurrent decomposition and the other sequential decomposition. We will briefly discuss the applicability of these two methods, and then illustrate them with two specific coordination problems: coordinating tasks and coordinating resource usage.We also investigate some aspects of the price of autonomy of these two coordination methods.","Multi-agent systems; Coordination; Autonomous planning; Algorithms","en","journal article","Springer","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Technology","","","",""
"uuid:2b87b82b-7ee0-4d8a-9730-59ac37c1a67a","http://resolver.tudelft.nl/uuid:2b87b82b-7ee0-4d8a-9730-59ac37c1a67a","Distorted octahedral coordination of tungstate in a subfamily of specific binding proteins","Hollenstein, K.; Comellas-Bigler, M.; Bevers, L.E.; Feiters, M.C.; Meyer-Klaucke, W.; Hagedoorn, P.L.; Locher, K.P.","","2009","Bacteria and archaea import molybdenum and tungsten from the environment in the form of the oxyanions molybdate (MoO4 2?) and tungstate (WO4 2?). These substrates are captured by an external, high-affinity binding protein, and delivered to ATP binding cassette transporters, which move them across the cell membrane. We have recently reported a crystal structure of the molybdate/tungstate binding protein ModA/WtpA from Archaeoglobus fulgidus, which revealed an octahedrally coordinated central metal atom. By contrast, the previously determined structures of three bacterial homologs showed tetracoordinate molybdenum and tungsten atoms in their binding pockets. Until then, coordination numbers above four had only been found for molybdenum/tungsten in metalloenzymes where these metal atoms are part of the catalytic cofactors and coordinated by mostly non-oxygen ligands. We now report a high-resolution structure of A. fulgidus ModA/WtpA, as well as crystal structures of four additional homologs, all bound to tungstate. These crystal structures match X-ray absorption spectroscopy measurements from soluble, tungstate-bound protein, and reveal the details of the distorted octahedral coordination. Our results demonstrate that the distorted octahedral geometry is not an exclusive feature of the A. fulgidus protein, and suggest distinct binding modes of the binding proteins from archaea and bacteria.","Tungsten; Binding proteins; Octahedral coordination; Crystal structure; Extended X-ray absorption fine structure","en","journal article","Springer","","","","","","","","Applied Sciences","Biotechnology","","","",""
"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:c5f8e2e3-682f-4a4e-b192-bd0e7c7da39e","http://resolver.tudelft.nl/uuid:c5f8e2e3-682f-4a4e-b192-bd0e7c7da39e","Extensions of Parallel Coordinates for Interactive Exploration of Large Multi-Timepoint Data Sets","Blaas, J.; Botha, C.P.; Post, F.H.","","2008","Parallel coordinate plots (PCPs) are commonly used in information visualization to provide insight into multi-variate data. These plots help to spot correlations between variables. PCPs have been successfully applied to unstructured datasets up to a few millions of points. In this paper, we present techniques to enhance the usability of PCPs for the exploration of large, multi-timepoint volumetric data sets, containing tens of millions of points per timestep. The main difficulties that arise when applying PCPs to large numbers of data points are visual clutter and slow performance, making interactive exploration infeasible. Moreover, the spatial context of the volumetric data is usually lost. We describe techniques for preprocessing using data quantization and compression, and for fast GPU-based rendering of PCPs using joint density distributions for each pair of consecutive variables, resulting in a smooth, continuous visualization. Also, fast brushing techniques are proposed for interactive data selection in multiple linked views, including a 3D spatial volume view. These techniques have been successfully applied to three large data sets: Hurricane Isabel (Vis’04 contest), the ionization front instability data set (Vis’08 design contest), and data from a large-eddy simulation of cumulus clouds. With these data, we show how PCPs can be extended to successfully visualize and interactively explore multi-timepoint volumetric datasets with an order of magnitude more data points.","parallel coordinate plots; time-varying; multi-field; linked related views","en","journal article","IEEE","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Mediamatics","","","",""
"uuid:178b886e-d6c8-4d39-be5d-03d9fa3a680f","http://resolver.tudelft.nl/uuid:178b886e-d6c8-4d39-be5d-03d9fa3a680f","Improving real-time train dispatching: Models, algorithms and applications","D'Ariano, A.","Hansen, I.A. (promotor)","2008","Traffic controllers monitor railway traffic sequencing train movements and setting routes with the aim of ensuring smooth train behaviour and limiting as much as existing delays. Due to the strict time limit available for computing a new timetable during operations, which so far is rather infeasible by using existing tools, railway traffic controllers usually restrict themselves mostly to a few manual timetable modifications and the chosen traffic control actions may be often sub-optimal. This PhD thesis is principally concerned with the design, implementation and evaluation of an advanced and robust laboratory tool for supporting railway traffic controllers in the everyday task of managing timetable disturbances. This dynamic traffic control system co-ordinates the speed of successive trains on open track, solves expected route conflicts and provides dynamic use of platform tracks in stations or alternative paths in a corridor between stations. Blocking time theory for modeling track occupation and signaling constraints is combined with alternative graphs for solving dynamic traffic control problems with the aim of increasing the punctuality and the use of infrastructure capacity at a network scale. The feasibility of the dispatching options is verified in a very short computation time by dynamic updating of the corresponding headways, train speeds and blocking time graphs, while the costs of the alternative dispatching options are measured in terms of maximum and average delays between consecutive trains at stations and other relevant points within the investigated network. To this end, the following achievements are included: (i) An innovative model for railway traffic optimization is presented to predict accurately train traffic flows and to enable the computation of optimal network schedules, i.e., all trains are managed simultaneously in a railway network for a given time period. (ii) The development of fast and effective scheduling algorithms based on the proposed model for the real-time management of a complex railway network is addressed. The objectives are to predict the evolution of train traffic within short computation times and to improve the punctuality by pro-actively detecting and solving train conflicts. (iii) A better use of rail capacity and a further improvement of punctuality are achieved by an iterative adjustment of train orders and routes in case of disturbances. Novel problem dedicated algorithms highlight the potential use of rerouting instead of only rescheduling the trains in order to limit the delay propagation as much as possible. (iv) Constructive algorithms for the dynamic modification of running times are provided that satisfy the timetable constraints of train orders and routes and guarantee the real-time feasibility of the running times, while respecting the signaling and safety systems in use. (v) A temporal decomposition method is introduced for the short-term traffic planning and control over a time period of up to several hours. This approach is of interest for traffic controllers since delays between running trains propagate considerably in time and space during heavily perturbed operations. (vi) A large set of computational studies on real-world instances proves that the automated decision support tool provides better solutions in terms of delay minimization compared to dispatching rules adopted by traffic controllers. Test beds are the hourly timetables of the Schiphol railway bottleneck and of the Utrecht - Den Bosch dispatching area. We study practical size instances and different types of disturbances, including multiple delayed trains, dwell time perturbations and blockage of some tracks.","real-time rail traffic management; decision support systems; alternative graph; scheduling; routing; blocking time theory; train speed coordination","en","doctoral thesis","TRAIL Research School","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:92a019ab-d5c7-4b33-8643-1548014a3a3b","http://resolver.tudelft.nl/uuid:92a019ab-d5c7-4b33-8643-1548014a3a3b","Multi-Agent Look-Ahead Traffic-Adaptive Control","Van Katwijk, R.T.","Hellendoorn, J. (promotor); De Schutter, B. (promotor)","2008","The objective of this thesis is to create a distributed, multi-agent, approach to traffic control. This PhD thesis' focus is on the control of a network instrumented by traffic signals.A thorough literature study has been performed, reviewing the current state of the art in traffic signal control. On the basis of this literature survey, a taxonomy of existing systems was constructed. The design of a traffic-adaptive control system is as well a science as an art. Along the way compromises have to be made in order to end up with a workable system that is not only able to come up with good signal timings, but is also able to deliver them on time. The taxonomy constructed of the various traffic-adaptive control algorithms is based both on the underlying principles and on the compromises that were made to come up with a workable, albeit less optimal system. A new adaptive control algorithm is subsequently developed that incorporates the strong points of each of the algorithms reviewed. The algorithm determines a short term policy on the basis of a long-term analysis and considers the individual signal groups as the smallest controllable entity. Although state of the practice in vehicle-actuated control, look-ahead adaptive control still use stages as the smallest controllable entity, which reduced the flexibility of this approach. The developed algorithm is capable of controlling a single intersection, but can be configured for use in a network. When configured for use in a network the controller shares its intentions regarding its control plan with nearby intersection controllers and informs them of traffic that it plans to release. In order to enable cooperation controllers must be willing to adjust their locally optimal control plan for the benefit of the network. In order to achieve this controllers are informed about the cost inflicted by them to nearby controllers. Using this information, intersection controllers can iteratively adjust their plan to the benefit of the network. In order to evaluate the developed control algorithms a test bed was developed during the course of this thesis. The test bed was essential in the development and testing of the algorithm. The test bed was also used in a proof-of-concept study for the N470, whereas the performance of the algorithm was benchmarked for a corridor against freshly optimized traffic-actuated controllers.","traffic; control; adaptive; look-ahead; coordination","en","doctoral thesis","","","","","","","","","Trail","","","","",""
"uuid:ceba2e4a-3cbd-47c9-b74c-b963f760cb5f","http://resolver.tudelft.nl/uuid:ceba2e4a-3cbd-47c9-b74c-b963f760cb5f","Coordinating Planning Agents for Moderately and Tightly-Coupled Tasks","Steenhuisen, J.R.; Witteveen, C.","","2007","","planning; qualitative temporal constraints; coordination","en","conference paper","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:8370d5f4-aea9-49cf-b8e8-99b27aeadca5","http://resolver.tudelft.nl/uuid:8370d5f4-aea9-49cf-b8e8-99b27aeadca5","Enabling Agility through Coordinating Temporally Constrained Planning Agents","Steenhuisen, J.R.; De Weerdt, M.M.; Witteveen, C.","","2007","In crisis response, hierarchical organizations are being replaced by dynamic assemblies of autonomous agents that promise more agility. However, these autonomous agents might cause a decrease in effectiveness when individually constructed plans for moderately-coupled tasks are not jointly feasible. Existing coordination techniques can be applied in the pre-planning phase to guarantee feasible joint plans for partially-ordered tasks, which allows for human improvisation in the planning phase. Temporal relations in crisis response are often more complex than the simple precedence relations in current work. Therefore, we analyze whether temporal information can be dealt with by a conversion to partially-ordered tasks with only precedence constraints. Time windows and two temporal constraints (overlaps and during) can be rewritten in such a way that the task remains partially-ordered. When other temporal constraints (meets, starts, finishes, and equals) are used, tasks become tightly-coupled, requiring coordination in the execution phase as well. This work shows the applicability of pre-planning coordination as an enabling technology for the effective formation of agile organizations.","multi-agent system; planning; qualitative temporal constraints; coordination","en","conference paper","ISCRAM","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""
"uuid:aa5bddd2-9dfd-4952-a5bb-d0e2091947bc","http://resolver.tudelft.nl/uuid:aa5bddd2-9dfd-4952-a5bb-d0e2091947bc","The influence of experience and camera holding on laparoscopic instrument movements measured with the TrEndo tracking system","Chmarra, M.K.; Kolkman, W.; Jansen, F.W.; Grimbergen, C.A.; Dankelman, J.","","2007","","Endoscope; Eye¿hand coordination: motion analysis; Laparoscopy: training","en","journal article","Springer","","","","","","","","Mechanical, Maritime and Materials Engineering","","","","",""
"uuid:3bda0794-1032-4c88-a728-40f4a110223b","http://resolver.tudelft.nl/uuid:3bda0794-1032-4c88-a728-40f4a110223b","Coordination among Autonomous Planners","Valk, J.M.","Sips, H.J. (promotor)","2005","","coordination; autonomous agents; AI planning","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:0ee5148b-ee03-49f1-af70-9532c8343503","http://resolver.tudelft.nl/uuid:0ee5148b-ee03-49f1-af70-9532c8343503","Model Predictive Control for Integrating Traffic Control Measures","Hegyi, A.","Hellendoorn, J. (promotor)","2004","Dynamic traffic control measures, such as ramp metering and dynamic speed limits, can be used to better utilize the available road capacity. Due to the increasing traffic volumes and the increasing number of traffic jams the interaction between the control measures has increased such that local control measures are often not sufficient anymore. In order to take into account these interactions, the control measures need to be coordinated such that they all serve the same objective. The central topic of this Ph.D. thesis is the coordinated control of traffic control measures with model predictive control. Besides the theoretical formulation of the general traffic control problem in the framework of model predictive control, a number of case studies are performed with this control approach. Model predictive control is a very suitable control method for traffic control problems, since it includes all elements that are necessary for a successful control of a traffic network: - the integration of the control measures, - the prediction of the effects of the control measures, which is necessary to take into account the effects on longer distances in the network, - a policy-based control goal, - the ability to cope with constraints on the control signal and the admissible traffic states. In this thesis we investigate through simulation the following traffic control scenarios, formulated in the MPC framework: - dynamic speed limits to eliminate shock waves on freeways, - coordinated speed limits and ramp metering to eliminate traffic jams on the freeway at the on-ramp, - coordinated dynamic route guidance and ramp metering to optimize route choice and to provide travel time information to drivers, - integrated control of a mixed urban-freeway network, to prevent shifting problems from one network to the other. Although these simulations give excellent results, traffic control is not a panacea for all traffic problems. Therefore, we present the necessary conditions for successful control, which are essential for an analysis before the control system is applied in practice.","dynacmic traffic control; coordinated control; traffic operations; speed limits; ramp metering; route guidance; optimal control","en","doctoral thesis","A. Hegyi","","","","","","","","Design, Engineering and Production","","","","",""
"uuid:6dc1c92d-e485-4c01-802a-28b9628e7cb9","http://resolver.tudelft.nl/uuid:6dc1c92d-e485-4c01-802a-28b9628e7cb9","Plan Merging in Multi-Agent Systems","De Weerdt, M.M.","Sips, H.J. (promotor); Meyer, J.J.Ch. (promotor)","2003","","multi-agent systems; AI planning; coordination; resource allocation","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:49a2bfdd-3200-4e53-8189-87f8073553b9","http://resolver.tudelft.nl/uuid:49a2bfdd-3200-4e53-8189-87f8073553b9","Coordinating distributed work: Exploring situated coordination with gaming-simulation","van Laere, J.","Sol, H.G. (promotor)","2003","Organizational work has become more and more distributed nowadays. Information and communication technologies (ICT) provide opportunities to improve coordination of distributed work, but in practice many organizations struggle with integrating new organizational structures, new work practices and ICT. In this dissertation we present a design approach for improving the coordination of distributed work. First we develop an integrated view on coordination, based on observations of current coordination practices at the Amsterdam Police Force and on a literature study of various theoretical perspectives from disciplines like organization science, information systems research, group dynamics and social psychology. In the coordination framework we distinguish 4 main coordination choices for employees at the group level (concerning composition, commitment, contact and content) and 4 related coordination choices for managers at the organizational level (concerning competence, cohesiveness, connection and context). These choices enable us to explain why ICT both enhance and complicate coordination of distributed work. Potentially, ICT has a positive impact on the dimensions of composition and contact and a negative impact on the dimensions of commitment and content. But the success or failure of ICT supported coordination largely depends on how employees and managers apply and use ICT. Consequently a neutral but critical attitude towards ICT support is needed. To improve coordination we apply paradoxical guidelines that take into account the dual impacts of ICT and a multitude of other influencing factors. In simulation games we enable organizational employees to explore future coordination alternatives and to gain experience in making situated coordination choices. The validity and usefulness of this design approach has been explored in two action research studies at the Amsterdam Police Force.","coordination; distributed work; distributed groups; virtual groups; gaming-simulation; gaming; computer supported cooperative work; business engineering; organization science","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:70d80827-8f89-48bc-9e61-f382fc316181","http://resolver.tudelft.nl/uuid:70d80827-8f89-48bc-9e61-f382fc316181","Energy integral method for gravity field determination from satellite orbit coordinates","Visser, P.N.A.M.; Sneeuw, N.; Gerlach, C.","","2003","A fast iterative method for gravity field determination from low Earth satellite orbit coordinates has been developed and implemented successfully. The method is based on energy conservation and avoids problems related to orbit dynamics and initial state. In addition, the particular geometry of a repeat orbit is exploited by using a very efficient iterative estimation scheme, in which a set of normal equations is approximated by a sparse block-diagonal equivalent. Recovery experiments for spherical harmonic gravity field models up to degree and order 80 and 120 were conducted based on a 29-day simulated data set of orbit coordinates. The method was found to be very flexible and could be easily adapted to include observations of non-conservative accelerations, such as (to be) provided by satellites like CHAMP, GRACE, and GOCE. A serious drawback of the method is its large sensitivity to satellite velocity errors. Existing orbit determination strategies need to be altered or augmented to include algorithms that focus on optimizing the accuracy of estimated velocities.","energy integral; gravity field determination; accelerometer observations; block-diagonal matrix; orbit errors; orbit coordinates","en","journal article","Springer","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:536f5c31-638a-4566-b798-3fc6bd892c77","http://resolver.tudelft.nl/uuid:536f5c31-638a-4566-b798-3fc6bd892c77","Hand-eye coordination in minimally invasive surgery: Theory, surgical practice & training","Wentink, M.","Stassen, H.G. (promotor); Wieringa, P.A. (promotor); Bonjer, H.J. (promotor)","2003","","Minimally invasive surgery; hand-eye coordination; sensorimotor transformations; training","en","doctoral thesis","","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"uuid:5792f355-4846-4a45-a711-5af06c51174d","http://resolver.tudelft.nl/uuid:5792f355-4846-4a45-a711-5af06c51174d","Supporting distributed planning in a dynamic environment: An observational study in operating room management","De Visser, J.; Wieringa, P.A.; Moss, J.; Xiao, Y.","","2002","","coordination; planning board; distributed planning; observational study","en","conference paper","University of Glasgow","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"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:8f202e69-1744-4f75-830a-2a76f191018b","http://resolver.tudelft.nl/uuid:8f202e69-1744-4f75-830a-2a76f191018b","Eye-hand coordination problems during minimally invasive surgery: From theory to clinical solution","Wentink, M.","","1999","","minimally invasive surgery; eye-hand coordination model; camera-rotation","en","conference paper","Group D Publications Ltd","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"uuid:dc89868a-1825-400f-b488-40596684881b","http://resolver.tudelft.nl/uuid:dc89868a-1825-400f-b488-40596684881b","A Design Coordination Approach to Design For X","Tichem, M.","Reijers, L.N. (promotor)","1997","","engineering design; design for x; design coordination","en","doctoral thesis","","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"uuid:d8bb57c3-cd09-40a8-ae10-b28a1cae11fe","http://resolver.tudelft.nl/uuid:d8bb57c3-cd09-40a8-ae10-b28a1cae11fe","The structure of business communication: Theory, model and application","Van Reijswoud, V.E.","Dietz, J.L.G. (promotor); Widdershoven, G.A.M. (promotor)","1996","","communication; coordination; organizational modeling","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:1dd32b47-4975-4750-a7e0-56a1ff73afaa","http://resolver.tudelft.nl/uuid:1dd32b47-4975-4750-a7e0-56a1ff73afaa","Designing organizational coordination","Eijck, D.T.T.","Sol, H.G. (promotor)","1996","","coordination; organizational management; process management","en","doctoral thesis","","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:954b1a19-b62e-42d0-8719-f60826b74ed3","http://resolver.tudelft.nl/uuid:954b1a19-b62e-42d0-8719-f60826b74ed3","3D-numerieke modellering gedeeltelijk geopende Haringvlietsluizen: Sluisformuleringen en testberekeningen voor implementatie in TRIWAQ KEPS02, fase 1","Kester, J.A.T.M. van; Stelling, G.S.","","1996","","Haringvliet; numerieke modellen; numerical modelling; zoutwaterindringing; salt water intrusion; stoftransport; mass transport; coordinatenstelsels; coordinate systems","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:9127c207-69ab-4b17-ae0b-44225a9a94de","http://resolver.tudelft.nl/uuid:9127c207-69ab-4b17-ae0b-44225a9a94de","Finite-Volume Computation of Incompressible Turbulent Flows in General Coordinates on Staggered Grids","Zijlema, M.; Segal, A.; Wesseling, P.","","1995","","finite volume curvilinear coordinates staggered grid turbulent recirculating flow navier-stokes equations nonsymmetric linear-systems invariant discretization diffuser solver scheme gmres; volume","en","journal article","","","","","","","","","","","","","",""
"uuid:16f48609-6c26-4dc6-9341-97db4d7bb98c","http://resolver.tudelft.nl/uuid:16f48609-6c26-4dc6-9341-97db4d7bb98c","Invariant discretization of the - model in general co-ordinates for prediction of turbulent flow in complicated geometries","Zijlema, M.; Segal, A.; Wesseling, P.","","1995","","navier-stokes equations; Turbulence Modeling Turbulent flow Curvilinear coordinates Navier Stokes equations Shell and tube exchanger Numerical simulation Pressure distribution Velocity distribution Turbulence Modelisation Ecoulement turbulent Coordonnee curviligne Equation Navier; volume","en","journal article","","","","","","","","","","","","","",""
"uuid:5ff272eb-8f55-4918-a405-9b2b6a02e4b4","http://resolver.tudelft.nl/uuid:5ff272eb-8f55-4918-a405-9b2b6a02e4b4","An Ilu Smoother for the Incompressible Navier-Stokes Equations in General Coordinates","Zeng, S.; Wesseling, P.","","1995","","navier-stokes equations; navier-stokes equations multigrid method smoothing method ilu factorization general coordinates invariant discretization transforming smoothers multigrid solution convergence algorithms flows grids heat","en","journal article","","","","","","","","","","","","","",""
"uuid:249e9c23-0175-4b74-90a2-38658d187c3b","http://resolver.tudelft.nl/uuid:249e9c23-0175-4b74-90a2-38658d187c3b","Multigrid Solution of the Incompressible Navier-Stokes Equations in General Coordinates","Zeng, S.; Wesseling, P.","","1994","","multigrid methods incompressible navier stokes equations staggered grid general coordinates invariant discretization diffusion equation interface problems convergence; navier-stokes equations","en","journal article","","","","","","","","","","","","","",""
"uuid:96c36c0d-f0d4-4dc3-9c91-1cdabd92bbc6","http://resolver.tudelft.nl/uuid:96c36c0d-f0d4-4dc3-9c91-1cdabd92bbc6","Multigrid schemes for time-dependent incompressible Navier-Stokes equations","Oosterlee, C.W.; Wesseling, P.","","1993","","differential-equations; Navier-Stokes-equations; multigrid-schemes; incompressible-Navier-Stokes-equations; finite-volume-method; curvilinear-coordinates; staggered-grid; time-dependent-equations; time-marching-scheme; parabolic-multigrid-scheme; multigrid-waveform; volume; navier-stokes equations","en","journal article","","","","","","","","","","","","","",""
"uuid:cfa3a53b-3231-4ef7-8583-178d246c58a2","http://resolver.tudelft.nl/uuid:cfa3a53b-3231-4ef7-8583-178d246c58a2","A robust multigrid method for a discretization of the incompressible Navier-Stokes equations in general coordinates","Oosterlee, C.W.; Wesseling, P.","","1993","","finite-element-analysis flow-simulation Navier-Stokes-equations contravariant-flux robust-multigrid-method discretization- incompressible-Navier-Stokes-equations general-coordinates stationary- finite-volume-method curvilinear-coordinates arbitrarily-shap; volume; navier-stokes equations","en","journal article","","","","","","","","","","","","","",""
"uuid:855a39c3-8652-4f8e-9d7f-03f2310592ba","http://resolver.tudelft.nl/uuid:855a39c3-8652-4f8e-9d7f-03f2310592ba","Benchmark Solutions for the Incompressible Navier-Stokes Equations in General Coordinates on Staggered Grids","Oosterlee, C.W.; Wesseling, P.; Segal, A.; Brakkee, E.","","1993","","benchmark solution incompressible navier-stokes staggered grid general coordinates multigrid coordinate systems fluid-flow invariant discretization primitive variables complex geometries multigrid method formulation boundaries domains solver; volume; navier-stokes equations","en","journal article","","","","","","","","","","","","","",""
"uuid:8bda5c9e-e094-4b09-af63-0aea45bdf3ac","http://resolver.tudelft.nl/uuid:8bda5c9e-e094-4b09-af63-0aea45bdf3ac","Invariant Discretization of the Incompressible Navier-Stokes Equations in Boundary Fitted Coordinates","Segal, A.; Wesseling, P.; Vankan, J.; Oosterlee, C.W.; Kassels, K.","","1992","","navier-stokes equations incompressible boundary-fitted coordinates boundary conditions invariant discretization complex geometries turbulent-flow system; navier-stokes equations","en","journal article","","","","","","","","","","","","","",""
"uuid:972910d1-5298-4de3-8094-ca3cc9290d25","http://resolver.tudelft.nl/uuid:972910d1-5298-4de3-8094-ca3cc9290d25","Experiences with two GPS SPS receivers in northern Europe","Pietersen, O.B.M.","","1991","Results are given of measurements with two hand-held GPS C/A- code SPS (Standard Positioning Service) receivers at thirty locations in Finland, Norway and Sweden. Comparison is made between computed positions by the receivers and positions on geographic maps. It is concluded that both receivers have pros en cons. A combination of the characteristics of the two would give a nearly ideal receiver. The measured accuracies are within the specifications given by the USA for SPS receivers. However to arrive at these results extra coordinate transformations, not available to an ordinary user, were necessary in the case of Finland and Sweden.","performance tests; Scandinavia; Global Positioning System; NAVSTAR satellites; position errors; instrument errors; radio receiver; portable equipment; equipment specifications; geodetic coordinates; maps","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:067dbe18-9453-48b7-ac39-3cd64199fa51","http://resolver.tudelft.nl/uuid:067dbe18-9453-48b7-ac39-3cd64199fa51","Large scale modeling in computational fluid dynamics","Wesseling, P.","","1991","","fluid-dynamics; fluid-dynamics Navier-Stokes-equations numerical-methods grid-generation software-development discretization-methods Cartesian-coordinates multigrid-solutions computational-fluid-dynamics domain-decomposition general-boundary-fitted-coordinates","en","conference paper","Elsevier, Amsterdam, Netherlands","","","","","","","","","","","","",""
"uuid:35342f3e-5fb4-4de2-8422-610e840f08ee","http://resolver.tudelft.nl/uuid:35342f3e-5fb4-4de2-8422-610e840f08ee","Radio positioning at sea: Geodetic survey computations, least squares adjustment","Bakker, G.; De Munck, J.C.; Strang van Hees, G.L.","","1989","Student edition","coordinate computation","en","book","Delft University Press","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:a10e13d5-e74a-40c0-82bf-08237baa32e5","http://resolver.tudelft.nl/uuid:a10e13d5-e74a-40c0-82bf-08237baa32e5","SIC: A new career in (tele)science?","Vreeburg, J.P.B.","","1989","In order to generate constructive discussion on the use of the Space Station for scientific purposes, a possible realisation of operations management is presented. The realisation is chosen to deal with the two main user concerns viz. realtime experiment control and priority allocation in experiment scheduling. From Spacelab it is known that the first is too complicated for the occasional investigator whereas the second subject should be much more transparent for relaxed planning by users. The proposed operations are anchored on a key individual, the Science Interface Coordinator (SIC) . Each SIC has a professional accreditation with the Operations Control Centre for the Space Station and has thereby acquired an account for two types of operations currency, viz. Priorities and Utility Credits. The SIC is the single point of contact for his scientist-clients to the Space Station, as a lawyer is to a court of law. Only the SIC has mandate to enter experiment scenarios in the Timeline of scheduled operations. Such scenarios are accompanied by a priority declaration and by resource allocation requests for which the SIC account is to be charged. A scheduled operation has its priority Increased automatically when overtaken by a time horizon that is part of the planning structure. Thence, early planning opens the possibility to save Priorities. Other incentive schemes are possible since both Priorities and Utility Credits are transferable. The prerequisites, advantages and disadvantages of this hypothetical operations scheme will be discussed, for the elucidation of the merits of actually planned implementations.","Science Interface Coordinator (SIC)","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:0d2c8652-a131-43f7-86a7-83bb94abccb2","http://resolver.tudelft.nl/uuid:0d2c8652-a131-43f7-86a7-83bb94abccb2","The geometry of geodetic inverse linear mapping and non-linear adjustment","Teunissen, P.J.G.","Waarda, W. (promotor); Rummel, R. (promotor)","1985","","shape of the earth; coordinate computation","en","doctoral thesis","","","","","","","","","","","","","",""
"uuid:fc16e3a4-309b-4b2b-b9cf-4c270be0c844","http://resolver.tudelft.nl/uuid:fc16e3a4-309b-4b2b-b9cf-4c270be0c844","Towards digital computer simulation of the dynamics of flexible spacecraft","van Woerkom, P.T.L.M.","","1983","Software design for digital computer simulation of the dynamics of flexible spacecraft equipped with actuators and sensors, should take into account two properties of the overall system: (i) s.ampled-data control of the spacecraft leads to discontinuous inputs (forcing functions) in the differential equations of motion, thereby requiring modification of the integration algorithm whenever an input change occurs, and (ii) numerical simulation of the structural vibrations in the higher frequency range requires small integration steps, thereby leading to long computer running times. The system of differential equations which describes the dynamics, is transformed sequentially to a modified modal form. The resulting system displays maximum decoupling between the system elements. It can be integrated analytically. Thus, exact difference equations are obtained for the numerical simulation. The associated time interval is determined mainly by measurement times, control update times, and measurement- and system noise simulation requirements. Use of the system of difference equations instead of the differential equations equations is expected to lead to an increase in accuracy. Also, the execution time of the numerical simulation is expected to decrease considerably, especially for flexible spacecraft with high model frequencies.","satellite attitude control; guidance sensors; actuators; mathematical models; parameterization; dynamic models; equations of motion; flexible spacecraft; infrared astronomy satellite; flexible bodies; appendages; coordinate transformations; state vectors; quaternions; algorithms; digital simulation; finite element method","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:0fbe9b9c-65d7-43ab-9cf2-7cb43df4b387","http://resolver.tudelft.nl/uuid:0fbe9b9c-65d7-43ab-9cf2-7cb43df4b387","Three-dimensional flight-path reconstruction by means of spline approximation","Best, M.R.","","1983","In NLR TR 82075 U, a method has been developed to reconstruct the flight-path of a symmetric flight, by representing this path by a set of splines. In the present report, the same method is being applied to a three-dimensional flight over a rotating earth. Preliminary results are comparable in accuracy and computing time to the Kalman (Square Root Information) Smoother, but reduction in computing time seems feasible.","aircraft manoeuvers; equations of motion; trajectory measurement; state vectors; spline functions; coordinate transformation; Kalman filters; three-dimensional motion; geocentric coordinates; geodetic coordinates; parameter identification; data smoothing; computer programs; running time (computers)","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:7001bac6-4a4f-49e0-b2f8-a10a81487a0d","http://resolver.tudelft.nl/uuid:7001bac6-4a4f-49e0-b2f8-a10a81487a0d","Improvement of the superposition of geographical data in KOSMOSS","van Popta, R.G.","","1983","Since mid 1982, the Royal Netherlands Meteorological Institute KNMI has to its possession a ground station (KOSMOSS), which receives and processes high resolution imagery, acquired from Tiros-N type weather satellites. To determine the weather positions in the images, the ground station is equipped with the capability to superpose, in real time, geographical data (e.g. coast contour lines) to the weather images. The applied superposition shows some imperfections: -the position deviation of the superposed geographical data is visible and disturbing, and -the superposed coast contour lines are too coarse. This report describes the results of an investigation to remove that imperfections through the application of more accurate orbital data, and more detailed coast contour lines. Further, thanges in the KOSMOSS software are proposed, of thiwh it is expected that they yield a substantial superposition improvement without decreasing the image production capacity of the KOSMOSS ground station.","satellite photography; TIROS-N satellite; superposition (mathematics); ground stations; orhital position prediction; position errors; image processing; meteorological charts; computer aided mapping; shorelines; computer programs; coordinate transformations","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:81330722-2009-4ce1-9cb9-9f25fb1d1e42","http://resolver.tudelft.nl/uuid:81330722-2009-4ce1-9cb9-9f25fb1d1e42","Hybrid equations for translational and rotational motion of flexible spacecraft","van Woerkom, P.T.L.M.","","1981","The report deals with the equations of motion of spacecraft with rigid main body, flexible appendages, and rotors and jets on the main body. The hybrid coordinate modelling method is applied. The resulting equations describe the translational motion of the spacecraft, the rotational motion, and the coupling between these two types of motion. The results are then specialized for the case of motion of threeaxis stabilized, flexible spacecraft, and foi- the case of pure planar motion.","Satellite attitude control; Spacecraft control; Spacecraft maneuvers; Three-axis stabilization; Spin stabilization; Mathematical models; Dynamic models; Equations of motion; Flexible spacecraft; Flexible bodies; Appendages; Coordinate transformation","en","report","Nationaal Lucht- en Ruimtevaartlaboratorium","","","","","","Campus only","","","","","","",""
"uuid:e655a52b-9261-4536-80c0-a4e6ccc013c4","http://resolver.tudelft.nl/uuid:e655a52b-9261-4536-80c0-a4e6ccc013c4","Supporting Developers’ Coordination in The IDE","Guzzi, A.; Bachelli, A.; Riche, Y.; Van Deursen, A.","","","Teamwork in software engineering is time-consuming and problematic. In this paper, we explore how to better support developers’ collaboration in teamwork, focusing on the software implementation phase happening in the integrated development environment (IDE). Conducting a qualitative investigation, we learn that developers’ teamwork needs mostly regard coordination, rather than concurrent work on the same (sub)task, and that developers successfully deal with scenarios considered problematic in literature, but they have problems dealing with breaking changes made by peers on the same project. We derive implications and recommendations. Based on one of the latter, we analyze the current IDE support for receiving code changes, finding that historical information is neither visible nor easily accessible. Consequently, we devise and qualitatively evaluate BELLEVUE, the design of an IDE extension to make received changes always visible and code history accessible in the editor.","developers' coordination; IDE extension; qualitative study","en","report","Delft University of Technology, Software Engineering Research Group","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Software Computer Technology","","","",""