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Menzen, C.M. (author), Memmel, E.M. (author), Batselier, K. (author), Kok, M. (author)This paper presents a method for approximate Gaussian process (GP) regression with tensor networks (TNs). A parametric approximation of a GP uses a linear combination of basis functions, where the accuracy of the approximation depends on the total number of basis functions M. We develop an approach that allows us to use an exponential amount...journal article 2023
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de Bruin, P. E. (author), Kaczmarek, M.B. (author), Kok, M. (author), Hassan HosseinNia, S. (author)This study evaluates three recursive Bayesian input and state estimation algorithms, as introduced in the field of Structural Health Monitoring, for estimating modal contributions for high-tech compliant mechanisms. The aim of estimating modal contributions is the use for active vibration control. High-tech compliant motion stages allow for...journal article 2023
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Menzen, C.M. (author), Fetter, Marnix (author), Kok, M. (author)We present a mapping algorithm to compute large-scale magnetic field maps in indoor environments with approximate Gaussian process (GP) regression. Mapping the spatial variations in the ambient magnetic field can be used for 10-calization algorithms in indoor areas. To compute such a map, GP regression is a suitable tool because it provides...conference paper 2023
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Edridge, T.I. (author), Kok, M. (author)Ferromagnetic materials in indoor environments give rise to disturbances in the ambient magnetic field. Maps of these magnetic disturbances can be used for indoor localisation. A Gaussian process can be used to learn the spatially varying magnitude of the magnetic field using magnetometer measurements and information about the position of the...conference paper 2023
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Viset, F.M. (author), Helmons, R.L.J. (author), Kok, M. (author)Accurately estimating the positions of multi-agent systems in indoor environments is challenging due to the lack of Global Navigation Satelite System (GNSS) signals. Noisy measurements of position and orientation can cause the integrated position estimate to drift without bound. Previous research has proposed using magnetic field simultaneous...conference paper 2023
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van der Holst, Bart (author), Verhoeven, Gijs (author), Matthijssen, E.F. (author), Vrijlandt, Mark (author), van der Meer, A.A. (author), Plug, R.B.F. (author), Kok, Koen (author)Due to the increasing penetration of distributed energy resources, congestion problems are already emerging in Dutch distribution grids. The available flexibility of assets in the built environment could have the potential to reduce congestion if prosumers are properly incentivized by distribution grid operators (DSOs). However, it is not yet...conference paper 2023
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Eichengreen, Adva (author), Tsou, Yung Ting (author), Nasri, Maedeh (author), van Klaveren, Lisa Maria (author), Li, Boya (author), Koutamanis, A. (author), Baratchi, Mitra (author), Blijd-Hoogewys, Els (author), Kok, Joost (author), Rieffe, Carolien (author)Social connectedness at school is crucial to children's development, yet very little is known about the way it has been affected by school closures during COVID-19 pandemic. We compared pre-post lockdown levels of social connectedness at a school playground in forty-three primary school-aged children, using wearable sensors, observations,...journal article 2023
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- Iglesias van Montfort, H.P. (author), Subramanian, S.S. (author), Irtem, I.E. (author), Sassenburg, M. (author), Li, Mengran (author), Kok, J.J. (author), Middelkoop, J. (author), Burdyny, T.E. (author) journal article 2023
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Endendijk, Thijs (author), Botzen, W. J. Wouter (author), de Moel, Hans (author), Aerts, Jeroen C. J. H. (author), Slager, Kymo (author), Kok, M. (author)Flood events are expected to increase in their frequency and severity, which results in higher flood risk without additional adaptation measures. The information gained from flood risk models is essential in effective disaster risk management. However, vulnerability estimations are often a large driver of uncertainty, and flood damage is...journal article 2023
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Pol, J.C. (author), Kindermann, P.E. (author), van der Krogt, M.G. (author), van Bergeijk, Vera M. (author), Remmerswaal, G. (author), Kanning, W. (author), Jonkman, Sebastiaan N. (author), Kok, M. (author)Structural reliability analysis often considers failure mechanisms as correlated but non-interacting processes. Interacting failure mechanisms affect each others performance, and thereby the system reliability. We describe such interactions in the context of flood defenses, and analyze under which conditions such interactions have a large impact...journal article 2023
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Endendijk, Thijs (author), Botzen, W.J. Wouter (author), de Moel, Hans (author), Aerts, Jeroen C.J.H. (author), Duijndam, Sem J. (author), Slager, Kymo (author), Kolen, B. (author), Kok, M. (author)This study provides an overview of the impact of the 2021 Summer floods in the Netherlands and the assessment of the effectiveness of various adaptation measures, evacuation strategies, and their impact on society. The floods were characterized by record rainfall in the cross-border region of the Meuse and Rhine basins and resulted in...journal article 2023
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van der Voorn, Tom (author), Quist, J.N. (author), Svenfelt, Åsa (author), Kok, Kasper (author), Hickman, Robin (author), Sheppard, Stephen (author), Kanyama, Annika Carlsson (author), Banister, David (author)In the face of climate change, a major challenge is to inform and guide long-term climate change adaptation planning under deep uncertainty, while aiming at transformative change. Normative futures studies approaches, such as participatory backcasting, visioning and transition management, are increasingly applied, but their potential for climate...journal article 2023
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Kok, Sjaak (author), Amoozandeh, A. (author), Radaelli, G. (author)Elastic structures that can deflect without springback, known as neutrally stable structures, form a remarkable group within their field, since they require the energetic state to remain unchanged during elastic deformation. Several examples in the literature obtain this state of neutral stability by the application of pre-stress, either as a...journal article 2023
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Klerk, W.J. (author), van Bergeijk, Vera (author), Kanning, W. (author), Wolfert, A.R.M. (author), Kok, M. (author)The condition of flood defence revetments is influenced by many different degradation processes such as animal burrowing, rutting and growth of weeds. Many of these processes are shock-based rather than progressive continuous. As shocks can cause a drop in performance, this means that the condition of a revetment can suddenly decrease,...journal article 2023
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den Heijer, F. (author), Kok, M. (author)A system of dikes in flood-prone areas continuously requires measures to mitigate changes such as ageing and climate change. Planning costly measures requires proper insight into system risk effects. Especially in a riverine dike system, the risk contributions of individual assets to the system flood risks are not independent, because...journal article 2023
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Skog, Isaac (author), Hendeby, Gustaf (author), Kok, M. (author)A framework for tightly integrated motion mode classification and state estimation in motion-constrained inertial navigation systems is presented. The framework uses a jump Markov model to describe the navigation system's motion mode and navigation state dynamics with a single model. A bank of Kalman filters is then used for joint inference...conference paper 2023
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Kok, Joëlle (author)Flyco is a large airline company who has built its strategy emphasising on operational excellence. Yet, since competitors can now achieve similar results, they have expanded their strategy to offering excellent customer experience too, resulting in the foundation of the Customer Experience (CX) department. Nevertheless, Flyco notices their NPS...master thesis 2022
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Kok, Reinier (author)In the case of the 2017 Grenfell Tower, the fire affected those who were already socio-economically underprivileged. Many residents of the Grenfell tower did not just become homeless or lost personal belongings, approximately two-thirds suffer from post-traumatic stress. Such layered and systemic disparities in the built environment as well as...master thesis 2022
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Balbo, Giorgio (author), Blom, Lisa (author), Kok, Jelle (author), Miranda de Andrade Veiga, Constanca (author), Pabsch, Christoph (author), Pszczółkowski, Igor (author), Shu, Luke (author), Stokman, Annemijn (author), Thornton, Jenny (author), Van, Guillermo (author)Reducing the emissions of ultra-fine particles in the vicinity of airports to minimise detrimental health effects for near-airport residents and airport personnel has been the main objective of the project. This report details the realisation of this goal which was done by designing a hybrid aircraft with notable improvements in the efficiency...bachelor thesis 2022
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Kok, Jim (author)COVID-19 drastically raised the importance of non-contact based healthcare methods. Low blood oxygen levels of a person, which can be unnoticeable, are potentially a precursor of COVID-19. Contact based methods for measuring blood oxygen saturation could spread the contagious disease. Therefore, this paper investigates non-contact RGB camera...master thesis 2022