- document
-
Endendijk, Thijs (author), Botzen, W.J. Wouter (author), de Moel, Hans (author), Slager, Kymo (author), Kok, M. (author), Aerts, Jeroen C.J.H. (author)Without taking additional measures, flooding is becoming more likely and intense in a changing climate, which causes large economic damage. Households and firms are directly impacted by physical flood damage, but further ripple effects on society occur through business disruptions. By using post-disaster survey data from the 2021 flood event in...journal article 2024
- document
-
Kok, M. (author), Solin, Arno (author), Schön, Thomas B. (author)Simultaneous localization and mapping (SLAM) is the task of building a map representation of an unknown environment while at the same time using it for positioning. A probabilistic interpretation of the SLAM task allows for incorporating prior knowledge and for operation under uncertainty. Contrary to the common practice of computing point...journal article 2024
- document
-
Hariharan Sudha, S. (author), Ragno, E. (author), Morales Napoles, O. (author), Kok, M. (author)The Netherlands has traditionally focused on managing flood risk. However, the frequent occurrence of droughts in recent years has brought attention to managing both extremes. Transitions between these opposite extremes pose additional challenges to water management, requiring a trade-off between water storage during dry periods and flood...journal article 2024
- document
-
Kok, M. (author), Slager, Kymo (author), de Moel, Hans (author), Botzen, Wouter (author), de Bruijn, Karin (author), Wagenaar, Dennis (author), Rikkert, S.J.H. (author), Koks, Elco (author), van Ginkel, Kees (author)The floods in the Netherlands in the summer of 2021 led to severe economic damage and losses in the affected area. A first estimate in September 2021 showed that more than 2,500 houses, more than 5,000 inhabitants and around 600 businesses were affected. Using the Dutch standard Flood Damage and Loss Model (SSM2017), and based on figures from...journal article 2023
- document
-
Chiasson, David (author), Lin, Yuan (author), Kok, M. (author), Shull, Peter (author)Hyperbolic localization measures the time difference of arrivals (TDOAs) of signals to determine the location of a wireless source or receiver. Traditional methods depend on precise clock synchronization between nodes so that time measurements from independent devices can be meaningfully compared. Imperfect synchronization is often the dominant...journal article 2023
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
- Strijker, B. (author), Kok, M. (author) conference paper 2022
- document
- Kok, M. (author) book chapter 2022
- document
-
Wahlstrom, Johan (author), Kok, M. (author)The last years have seen a growing body of literature on data-driven pedestrian inertial navigation. However, despite this, it is still unclear how to efficiently combine classical models and other a priori information with existing machine learning frameworks. In this paper, we first categorize existing approaches to data-driven pedestrian...journal article 2022
- document
-
Kok, M. (author), Eckhoff, Karsten (author), Weygers, Ive (author), Seel, Thomas (author)Real-time motion tracking of kinematic chains is a key prerequisite in the control of, e.g., robotic actuators and autonomous vehicles and also has numerous biomechanical applications. In recent years, it has been shown that, by placing inertial sensors on segments that are connected by rotational joints, the motion of that kinematic chain...journal article 2022