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Arkesteijn, M.H. (author), Jansen, S.J.T. (author), Kieft, B.B.T. (author), Appel-Meulenbroek, Rianne (author), Hoekstra, Bartele (author), Jongens-Vander Schaaf, Pity (author)Due to the COVID-19 crisis, Dutch employees were told to work from home as much as possible. Homeworking can have benefits both for employees and employers, as some experience a productivity increase and a better work-life balance. However, it is also harder for employers to measure and monitor employees’ performance and for the employee it can...conference paper 2021
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Hoekstra, J.M. (author), Ellerbroek, Joost (author)Purpose of Review A lot of research into decentralised, state-based conflict detection and resolution, or detect and avoid algorithms has been executed. This paper explains the essential properties of state-based conflict detection and reviews the work in the context of applications for not only manned but also unmanned aerial vehicles, where...journal article 2021
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Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Drone-based delivery is likely to reduce energy and greenhouse gas emissions associated with the transport of small express packages, fast-food meals and medicines, especially when deployed in large-scale in urban areas. However, it is an enormous challenge to facilitate such high traffic densities in constrained urban environments. A recent...conference paper 2021
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Badea, C. (author), Morfin Veytia, A. (author), Ribeiro, M.J. (author), Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Road traffic delay and urban overcrowding are increasing rapidly all over the world. As a result, several companies have proposed the use of small unmanned aerial vehicles (sUAVs) as an alternative to road-based transportation. These small autonomous drones are expected to operate within a thin airspace band (Very Low Level) in high traffic...conference paper 2021
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Caranti, L. (author), Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)The capacity of the current system of air traffic is rapidly reaching a limit with the increasing demand for air transportation. Expected future traffic densities not only make automated conflict detection and resolution a necessity, but also force a re-evaluation of coordination elements to decrease conflict rate and severity. It has been...conference paper 2021
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Ahedo, Manuel (author), Hoekstra, J.S.C.M. (author), Extezarreta, Aitziber (author)National housing systems increasingly combine three main types of housing: the private property sector (home ownership and private rental), social and public rental (public and non-profit sectors) and cooperative (social or civil economy). The dominant private type has facilitated housing speculation, which in many countries has become a...journal article 2021
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Gentili, M. (author), Hoekstra, J.S.C.M. (author)Access to homeownership for young adults is becoming more and more difficult. Italy – where homeownership rates for young adults are steadily decreasing – is a case in point. In the recent past, becoming homeowner was an obvious housing pathway for Italian young adults, even from lower-middle class families. If your parents were homeowner,...journal article 2021
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Doole, M.M. (author), Ellerbroek, Joost (author), Knoop, V.L. (author), Hoekstra, J.M. (author)Large-scale adoption of drone-based delivery in urban areas promise societal benefits with respect to emissions and on-ground traffic congestion, as well as potential cost savings for drone-based logistic companies. However, for this to materialise, the ability of accommodating high volumes of drone traffic in an urban airspace is one of the...journal article 2021
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Metz, I.C. (author), Ellerbroek, Joost (author), Mühlhausen, Thorsten (author), Kügler, Dirk (author), Hoekstra, J.M. (author)Bird strike prevention in civil aviation has traditionally focused on the airport perimeter. Since the risk of especially damaging bird strikes outside the airport boundaries is rising, this paper investigates the safety potential of operational bird strike prevention involving pilots and controllers. In such a concept, controllers would be...journal article 2021
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Metz, I.C. (author), Ellerbroek, Joost (author), Mühlhausen, Thorsten (author), Kügler, Dirk (author), Kern, Stefan (author), Hoekstra, J.M. (author)Involving air traffic controllers and pilots into the bird strike prevention process is considered an essential step to increase aviation and avian safety. Prior to implementing operational measures such as real-time warning systems, it is vital to evaluate their feasibility. This paper studies the efficacy of a bird strike advisory system for...journal article 2021
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Hoekstra, J.S.C.M. (author), Dol, C.P. (author)The ageing of European societies, the mounting pressure on pension systems, the rise of home ownership and the growth in house prices have sparked interest in housing equity release options and strategies. Much of the available literature approaches this topic through a financial lens, focusing on equity release schemes as a way to free up...journal article 2021
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Hoekstra, Maxime (author)In this thesis max-plus algebra is introduced and applied to the problem of controlling train delays. Two control strategies for the propagation of delays are discussed. The first is by letting certain trains run faster when a delay is detected, the second is by breaking connections between trains that have to wait for each other in order to...bachelor thesis 2020
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)A detailed situation awareness of the local environment is essential for safe flight in General Aviation. When operating under Visual Flight Rules, eyesight is crucial for maintaining situation awareness and objects may be overlooked. Technical solutions such as Flarm have been sought, but they only work on a basis of co-operation: obstacles...journal article 2020
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Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Driven by rising consumer demand, interest is growing in the application of autonomous unmanned aerial vehicles (drones) for the last-mile delivery of small express packages and fast-food meals in cities. To be realised, this would require the Very Low Level (VLL) urban airspace to be able to cope with high traffic densities of commercial...journal article 2020
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Hoekstra, J.S.C.M. (author), Gentili, M. (author)This report is part of deliverable 4.1 of the H2020 UPLIFT project. It outlines the theoretical and methodological principles of the process of reflexive policy-making that will take place in four UPLIFT implementation sites. In the first part of this report (chapters 2 and 3), these principles are outlined in more detail. After that, a brief...report 2020
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Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Current investigations into urban aerial mobility, as well as the continuing growth of global air transportation, have renewed interest in Conflict Detection and Resolution (CD&R) methods. With the new applications of drones, and the implications of a profoundly different urban airspace, new demands are placed on such algorithms, further...review 2020
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Schlathölter, Thomas (author), Mostafa, Yahia (author), Kamman, Amber (author), Dongelmans, Arnold (author), Arribard, Yann (author), Cazaux, S.M. (author), Hoekstra, Ronnie (author)Abstract: When exposed to a thermal beam of hydrogen atoms, gas-phase coronene cations C<sub>24</sub>H<sub>12</sub><sup>+</sup> can be sequentially hydrogenated. This process is accompanied by a gradual transition of the electronic structure from aromatic to aliphatic. The planar very stable coronene structure transforms into the...journal article 2020
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- Albeda, Hein (author), Hoekstra, J.S.C.M. (author), Van Beusekom, Evelien (author) report 2020
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Hoekstra, Erik (author)In the coming decades, cities will have to house a lot more residents. For now, this unavoidable change is yet unimaginable. However, cities do have to prepare for challenges to come. Cities face the task to offer more housing in an already set framework of the existing context. How can a provision of housing be made in a dense urban context...master thesis 2020
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Maas, J.B. (author), Stefanovici, V. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Many pilots in General Aviation use electronic add-ons aids in flight, which rely on satellite navigation information. This navigation information is often a single point of failure which is undesirable since the pilot relies on the information. This paper presents the results of research whether a novel mobile radar station can be used to...conference paper 2020