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Hoekstra, J.S.C.M. (author), Gentili, M. (author)In this policy brief, we provide relevant guidelines and recommendations for each of these phases, based on our evaluation of the UPLIFT co-creation process<br/>in the four different cities. These guidelines and recommendations are meant to inspire and provide support to governments and/or service providers<br/>that want to start a similar co...report 2023
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Badea, C. (author), Morfin Veytia, A. (author), Patrinopoulou, Niki (author), Daramouskas, Ioannis (author), Ellerbroek, Joost (author), Lappas, Vaios (author), Kostopoulos, Vassilios (author), Hoekstra, J.M. (author)The use of small aircraft for a wide range of missions in urban airspace is expected to increase in the future. In Europe, efforts have been invested into developing a unified system, called U-space, to manage aircraft in dense very-low-level urban airspace. The Metropolis II project aimed to research what degree of centralisation an air traffic...journal article 2023
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An investigation of operational management solutions and challenges for electric taxiing of aircraftZoutendijk, M. (author), Mitici, M.A. (author), Hoekstra, J.M. (author)Taxiing aircraft using electric towing vehicles (ETVs) is expected to significantly contribute to the objective of climate-neutral aviation by 2050. This study reviews existing work on operational aspects of electric towing of aircraft, and discusses management solutions. We first discuss the varying electric taxi systems currently under...journal article 2023
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Groot, D.J. (author), Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)The number of unmanned aircraft operating in the airspace is expected to grow exponentially during the next decades. This will likely lead to traffic densities that are higher than those currently observed in civil and general aviation, and might require both a different airspace structure compared to conventional aviation, as well as different...conference paper 2023
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Roosenbrand, E.J. (author), Sun, Junzi (author), Hoekstra, J.M. (author)Contrails contribute to global warming by trapping outgoing terrestrial radiation, exerting an immediate warming influence on the climate. The climatic impact of contrails is potentially comparable to that of aviation’s carbon emissions. This underlines the importance of minimizing contrail formation to mitigate the climate effects of aviation,...conference paper 2023
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Chamari, L. (author), van der Weijden, J.A.M. (author), Boonstra, L. (author), Hoekstra, W.S. (author), Petrova, E. (author), Pauwels, P. (author)The integration of data from a variety of systems is critical for developing smart building applications. Design, construction, maintenance, energy management, and automation data are among few. For this integration, having a comprehensive metadata schema is crucial. Semantic web technologies and domain ontologies have been proposed as a means...conference paper 2023
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Bohm, N.L. (author), Hoekstra, M.J. (author), van den Burg, L.P.J. (author), Reincke, M.M.O. (author)In this case study, we answer the question: what are design characteristics for a personal development line integrated in undergraduate engineering curricula? We investigated the development of such a line in a Bachelor of Architecture, Urbanism and Building Sciences in The Netherlands. We documented and analysed the preparation of and...conference paper 2023
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Croon, T.M. (author), Hoekstra, J.S.C.M. (author), Dubois, Ute (author)This report addresses energy poverty in social housing, proposing solutions to aid an inclusive energy transition. It highlights the disproportionate impact of rising prices on vulnerable tenants, suggesting short-term measures like energy advice and energy-saving kits, along with long-term strategies such as prioritising renovations for those...report 2023
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Appel-Meulenbroek, Rianne (author), Voulon, Thijs (author), Bergefurt, Lisanne (author), Arkesteijn, M.H. (author), Hoekstra, B.S. (author), der Schaaf, Pity Jongens Van (author)BACKGROUND: During the COVID-19 pandemic, office workers were obliged to work from home (WFH). Alongside known positive aspects of home-based telework, it is associated with reduced health and productivity impacts. Its success depends on employee and environmental characteristics. OBJECTIVE: This paper fills the gap in knowledge on the...journal article 2023
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Roosenbrand, E.J. (author), Sun, Junzi (author), Hoekstra, J.M. (author)As global flight volume rises, the aviation industry is facing increasing climate challenges. One major factor is the impact of contrails, which trap outgoing terrestrial radiation and counteract emission reduction benefits from emission-optimized flight routes. Our study quantifies contrail-forming flights globally and assesses altitude...journal article 2023
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Croon, T.M. (author), Hoekstra, J.S.C.M. (author), Elsinga, M.G. (author), Dalla Longa, F. (author), Mulder, Peter (author)Recent energy price spikes have led to increased energy poverty among low-income households living in inefficient homes. Accurate statistics on energy poverty help inform resource allocation and better target relief schemes and retrofit funds. Existing indicators are predominantly defined in terms of a headcount ratio – the share of population...journal article 2023
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van Oosterom, S.J.M. (author), Mitici, M.A. (author), Hoekstra, J.M. (author)Following the Paris Accords, the aviation industry aims to become climate neutral by 2050. In this line, electric vehicles that tow aircraft during taxiing are a promising emerging technology to reduce emissions at airports. This paper proposes an end-to-end optimization framework for electric towing vehicles (ETVs) dispatchment at large...journal article 2023
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Patrinopoulou, N. (author), Daramouskas, I. (author), Lappas, V. (author), Morfin Veytia, A. (author), Badea, C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), De Vries, V. (author), Van Ham, J. (author)Metropolis II aims to provide insights in what is needed to enable high-density urban air operations. It does this by investigating the foundation for U-space U3/U4 services. The final goal is to provide a unified approach for strategic deconfliction, tactical deconfliction, and dynamic capacity management. Highly-dense operations in...conference paper 2022
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Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Package delivery via autonomous drones is often presumed to hold commercial and societal value when applied to urban environments. However, to realise the benefits, the challenge of safely managing high traffic densities of drones in heavily constrained urban spaces needs to be addressed. This paper applies the principles of traffic segmentation...journal article 2022
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Gentili, M. (author), Hoekstra, J.S.C.M. (author)This report examines the scales and dimensions of inequality in the functional urban area (FUA) of Amsterdam, the Netherlands. Our purpose is to understand how the drivers of socio-economic inequality, and the policies responding to these, operate in this local context. Particular attention is paid to the room for action of local policies and...report 2022
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Gentili, M. (author), Hoekstra, J.S.C.M. (author)This report examines the scales and dimensions of inequality in the functional urban area (FUA) of Leuven, in the Flemish region of Belgium. Our purpose is to understand how the drivers of socio-economic inequality, and the policies responding to these, operate in this local context. Particular attention is paid to the room for action of local...report 2022
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Roosenbrand, E.J. (author), Sun, Junzi (author), Dedoussi, I.C. (author), Stam, D.M. (author), Hoekstra, J.M. (author)Sustainability is the biggest challenge facing the aerospace industry today. With the global number of flights expected to rise, the climate impact of aviation will continue to increase. Current research states that the rerouting of aircraft through wind-optimisation for the purpose of fuel usage minimisation and emission reduction is an...conference paper 2022
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Groot, D.J. (author), Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Current estimates show that the presence of unmanned aviation is likely to grow exponentially over the course of the next decades. Even with the more conservative estimates, these expected high traffic densities require a re-evaluation of the airspace structure to ensure safe and efficient operations. One structure that scored high on both the...conference paper 2022
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Badea, C. (author), Groot, D.J. (author), Morfin Veytia, A. (author), Ribeiro, M.J. (author), Dalmau, Ramon (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Air traffic demand has increased at an unprecedented rate in the last decade (albeit interrupted by the COVID pandemic), but capacity has not increased at the same rate. Higher levels of automation and the implementation of decision-support tools for air traffic controllers could help increase capacity and catch up with demand. The air traffic...conference paper 2022
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Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Future high traffic densities with drone operations are expected to exceed the number of aircraft that current air traffic control procedures can control simultaneously. Despite extensive research on geometric CR methods, at higher densities, their performance is hindered by the unpredictable emergent behaviour from surrounding aircraft. In...journal article 2022