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Roosenbrand, E.J. (author), Sun, Junzi (author), Hoekstra, J.M. (author)
One of the biggest challenges facing the aerospace industry today is its sustainability. As the number of flights is expected to rise globally, aviation’s climate impact will continue to increase. Current research has extensively addressed the rerouting of aircraft through wind-optimization in order to minimize fuel burn and emissions. Such...
conference paper 2022
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Vlaskin, A. (author), Sun, Junzi (author), Hoekstra, J.M. (author)
The consumer drone sector is expected to grow rapidly in the coming decades. In Europe alone, some predictions show as many as seven million drones will be flying by 2050. This poses a challenge for surveillance. In this paper, we study an Automatic Dependent Surveillance system concept similar to the one for current aircraft surveillance, which...
conference paper 2022
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Giliam, M.A. (author), Ellerbroek, Joost (author), Badea, C. (author), Morfin Veytia, A. (author), Hoekstra, J.M. (author)
In order to enable the safe and efficient integration of Unmanned Aerial Vehicles into very low level airspace, current day research focuses on the development of new traffic services and procedures. One of these is the geovectoring protocol, which aims to reduce traffic complexity by setting limits on the allowed ground speed, course, and...
conference paper 2022
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Morfin Veytia, A. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)
The rate of urbanization is expected to continue increasing. This has led to an interest in using drones and air taxis for urban transportation in place of the current methods, which often lead to road congestion. In most places urban air operations will happen above buildings. However, in many cities with large skyscrapers it may not be...
conference paper 2022
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Groot, D.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)
Over the next decades, it is expected that the number of unmanned aerial vehicles (UAVs) operating in the airspace will grow rapidly. Both the FAA (Federal Aviation Administration) and the ICAO (International Civil Aviation Organisation) have already stated that aircraft operating autonomously or beyond their operators’ line of sight are...
conference paper 2022
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Badea, C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)
The interest for using small aircraft for missions in urban airspace is growing for applications like parcel deliveries. Research shows that conventional airspace structure and conflict detection and resolution techniques are not suitable for main- taining a high level of safety in constrained urban environments, especially when aircraft are...
conference paper 2022
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Groot, D.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)
Deep Reinforcement Learning has seen more usage in the field of Air Traffic Control over the last couple of years. As the number of aircraft in a given sector of airspace is not constant, there is a need for methods to be invariant to the number of agents in the system. Often this is done by making a selection of the aircraft that will be...
conference paper 2022
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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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Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)
Future operations involving drones are expected to result in traffic densities that are orders of magnitude higher than any observed in manned aviation. Current geometric conflict resolution (CR) methods have proven to be very efficient at relatively moderate densities. However, at higher densities, performance is hindered by the...
journal article 2022
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Hoekstra, J.S.C.M. (author), Gentili, M. (author)
This deliverable is titled ‘Updated Action Plans for the co-creation process’ and it consists of a common methodological approach, the state of the art of the Local Action Plans of the four WP4 implementation sites, and a reflection on the co-creation process.<br/>This deliverable is the formal update of D4.1, which is taken as the starting...
report 2021
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Huygen, W.J.M. (author), Sun, Junzi (author), Hoekstra, J.M. (author)
Automatic Dependent Surveillance-Broadcast (ADS-B) enables aircraft to periodically broadcast their flight states such as position and velocity. Compared to classical radar surveillance, it increases update rate and accuracy. Currently, Mode S Extended Squitter is the most common implementation for ADS-B. Due to the simplicity of Mode S design,...
journal article 2021
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Bonifazi, A. (author), Sun, Junzi (author), van Baren, Gerben (author), Hoekstra, J.M. (author)
Not all flight data anomalies correspond to operational safety concerns. But anomalous safety events can be linked to anomalies in flight data. During the final phases of a flight, two significant safety events are unstable approach and goaround. In this paper, using Automatic Dependent Surveillance- Broadcast (ADS-B) data, we develop several...
conference paper 2021
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Nurmohamed, F. Ruben H.A. (author), Van Dijk, Bruce (author), Veltman, Ewout S. (author), Hoekstra, Marrit (author), Rentenaar, Rob J. (author), Weinans, Harrie (author), Vogely, H. Charles (author), Van Der Wal, Bart C.H. (author)
Introduction: Debridement, antibiotics and implant retention (DAIR) procedures are effective treatments for acute postoperative or acute hematogenous periprosthetic joint infections. However, literature reporting on the effectiveness of DAIR procedures performed after a one- or two-stage revision because of a prosthetic joint infection (PJI) ...
journal article 2021
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Graas, R. (author), Sun, Junzi (author), Hoekstra, J.M. (author)
Several initiatives are developed to shift the current paradigm in Air Traffic Management from the tactical-based approach to more strategic-based coordination of flights. This transformation of the ATM system relies on the improvement of predictive models for the 4D flight trajectories. A variety of performance-based and data-driven approaches...
conference paper 2021
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Zhang, Qian (author), Hoekstra, J.S.C.M. (author)
Traditionally, Chinese migrant workers are housed in dormitories or in the private rental sector. In recent years, however, an increasing proportion of the migrant workers has managed to become home owners. This paper further analyzes this trend, which may signify a new phase in the Chinese urbanization process. After a review of the existing...
conference paper 2021
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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&amp;R) methods. The use of drones for applications such as package delivery, would result in traffic densities that are orders of magnitude higher than those currently...
journal article 2021
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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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