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Viset, F.M. (author), Gravdahl, Jan Tommy (author), Kok, M. (author)We propose an application of magnetic field norm simultaneous localisation and mapping to measurements from a foot-mounted sensor for pedestrian navigation. The algorithm is, to the best of the authors’ knowledge, the first three dimensional drift-compensating indoor navigation method using only accelerometer, gyroscope and magnetometer...conference paper 2021
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Remmerswaal, Evan (author), Weygers, Ive (author), Smit, G. (author), Kok, M. (author)We present a novel approach to estimate the relative sensor orientation from inertial sensors placed on connected body segments. Drift in the relative orientation estimates obtained by integrating the gyroscope measurements is corrected solely by incorporating common information in the inertial sensor measurements due to the connection of the...conference paper 2021
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Marijnissen, Richard J.C. (author), Kok, M. (author), Kroeze, Carolien (author), van Loon-Steensma, J.M. (author)In this paper the safety of a double-dike system (or twin dikes) is assessed. Such a system consist of two parallel lines of flood defences. During storms the combined strength of the parallel flood defences must prevent flooding of the hinterland. A culvert can be implemented for the tidal exchange of sea water to enable new land-uses in the...journal article 2021
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Rongen, G.W.F. (author), Strijker, B. (author), Pol, J.C. (author), Kok, M. (author), Kolen, B. (author), Rikkert, S.J.H. (author), Schlumberger, J. (author), van Haren, M. (author), Wüthrich, D. (author)In juli 2021 zijn grote delen van Limburg getroffen door hevige regenval en overstromingen. Ook delen van België en Duitsland overstroomden met zeer veel schade en verlies aan mensenlevens tot gevolg. Dit betrof een extreme en ongeëvenaarde gebeurtenis met enorme impact. Daarom is naar aanleiding van de overstromingen deze verkenning uitgevoerd...report 2021
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Vergara Barrios, P.P. (author), Subramanian, Arun (author), Van Der Veen, Aliene (author), Kok, Koen (author)In this paper, a co-simulation framework is presented to assess the impact on the distribution network of provision of support services (i.e. voltage support) by smart residential users. Such users are capable of providing flexibility by increasing/decreasing generation/consumption controlling the operation of an available set of flexible...conference paper 2021
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Wewer, M. (author), Aguilar Lopez, J.P. (author), Kok, M. (author), Bogaard, T.A. (author)Backward erosion piping is an internal erosion process, which compromises the stability of water retaining structures such as dams and levees. In this paper, we propose a numerical solution that combines a 2D Darcy groundwater solution with Exner's 1D sediment transport mass conservation equation. As an estimate of sediment transport, we...journal article 2021
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Vittorietti, M. (author), Kok, Piet J.J. (author), Sietsma, J. (author), Li, W. (author), Jongbloed, G. (author)Modeling microstructures is an interesting problem not just in materials science, but also in mathematics and statistics. The most basic model for steel microstructure is the Poisson-Voronoi diagram. It has mathematically attractive properties and it has been used in the approximation of single-phase steel microstructures. The aim of this...journal article 2020
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Weygers, Ive (author), Kok, M. (author), Konings, Marco (author), Hallez, Hans (author), De Vroey, Henri (author), Claeys, Kurt (author)The use of inertial measurement units (IMUs) has gained popularity for the estimation of lower limb kinematics. However, implementations in clinical practice are still lacking. The aim of this review is twofold-to evaluate the methodological requirements for IMU-based joint kinematic estimation to be applicable in a clinical setting, and to...review 2020
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van der Krogt, M.G. (author), Klerk, W.J. (author), Kanning, W. (author), Schweckendiek, T. (author), Kok, M. (author)Spatial variability and limited measurements often result in low reliability estimates of geotechnical failure modes of dikes (i.e., earthen flood defences). Required dike reinforcements are usually not executed within a few years after inception, which enables efforts to improve reliability estimates by reducing uncertainty. Often decision...journal article 2020
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Costa, Ana Laura (author), Kok, Sien (author), Korff, M. (author)In the Netherlands, subsidence of peat and clay soils due to (artificial) lowering of the groundwater table and loading of soft soils is commonplace, causing extensive damage to exposed and vulnerable assets. Awareness of subsidence-related damage to buildings has recently increased in the Netherlands, particularly after reported damages due...journal article 2020
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Kok, R.N. (author), Hebert, Laetitia (author), Huelsz-Prince, Guizela (author), Goos, Yvonne J. (author), Zheng, X.Z. (author), Bozek, Katarzyna (author), Stephens, Greg J. (author), Tans, S.J. (author), Van Zon, Jeroen S. (author)Time-lapse microscopy is routinely used to follow cells within organoids, allowing direct study of division and differentiation patterns. There is an increasing interest in cell tracking in organoids, which makes it possible to study their growth and homeostasis at the singlecell level. As tracking these cells by hand is prohibitively time...journal article 2020
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Weygers, Ive (author), Kok, M. (author), De Vroey, Henri (author), Verbeerst, Tommy (author), Versteyhe, Mark (author), Hallez, Hans (author), Claeys, Kurt (author)The ability to capture joint kinematics in outside-laboratory environments is clinically relevant. In order to estimate kinematics, inertial measurement units can be attached to body segments and their absolute orientations can be estimated. However, the heading part of such orientation estimates is known to drift over time, resulting in...journal article 2020
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Olsson, Fredrik (author), Kok, M. (author), Seel, Thomas (author), Halvorsen, Kjartan (author)Inertial motion capture relies on accurate sensor-to-segment calibration. When two segments are connected by a hinge joint, for example in human knee or finger joints as well as in many robotic limbs, then the joint axis vector must be identified in the intrinsic sensor coordinate systems. Methods for estimating the joint axis using...journal article 2020
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Milidonis, Xenios (author), Nazir, Muhummad Sohaib (author), Schneider, Torben (author), Capstick, Myles (author), Drost, S. (author), Kok, Gertjan (author), Pelevic, Nikola (author), Poelma, C. (author), Schaeffter, Tobias (author), Chiribiri, Amedeo (author)Purpose: Cardiovascular magnetic resonance first-pass perfusion for the pixel-wise detection of coronary artery disease is rapidly becoming the clinical standard, yet no widely available method exists for its assessment and validation. This study introduces a novel phantom capable of generating spatially dependent flow values to enable...journal article 2020
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Wahlström, Johan (author), Kok, M. (author), Porto Buarque de Gusmão, Pedro (author), Abrudan, Traian E. (author), Trigoni, Niki (author), Markham, Andrew (author)Magneto-inductive navigation is an inexpensive and easily deployable solution to many of today’s navigation problems. By utilizing very low frequency magnetic fields, magneto-inductive technology circumvents the problems with attenuation and multipath that often plague competing modalities. Using triaxial transmitter and receiver coils, it is...journal article 2020
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Curran, A.N. (author), de Bruijn, K.M. (author), Domeneghetti, Alessio (author), Bianchi, Federica (author), Kok, M. (author), Vorogushyn, Sergiy (author), Castellarin, Attilio (author)Reliable hazard analysis is crucial in the flood risk management of river basins. For the floodplains of large, developed rivers, flood hazard analysis often needs to account for the complex hydrology of multiple tributaries and the potential failure of dikes. Estimating this hazard using deterministic methods ignores two major aspects of...journal article 2020
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Seel, Thomas (author), Kok, M. (author), McGinnis, Ryan S. (author)This editorial provides a concise introduction to the methods and applications of inertial sensors. We briefly describe the main characteristics of inertial sensors and highlight the broad range of applications as well as the methodological challenges. Finally, for the reader’s guidance, we give a succinct overview of the papers included in...contribution to periodical 2020
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Girrbach, Fabian (author), Kok, M. (author), Zandbergen, Raymond (author), Hageman, Tijmen (author), Diehl, Moritz (author)Robust and accurate pose estimation of moving systems is a challenging task that is often tackled by combining information from different sensor subsystems in a multi-sensor fusion setup. To obtain robust and accurate estimates, it is crucial to respect the exact time of each measurement. Data fusion is additionally challenged when the...conference paper 2020
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Hiemstra, K.S. (author), van Vuren, S. (author), Vinke, Frederik R.S. (author), Jorissen, Richard E. (author), Kok, M. (author)Worldwide, rivers provide important socio-economic and environmental functions and are essential to human well-being. The growing demand of user-functions and the change in river conditions due to large-scale morphology and climate change, increase the pressure on lowland river systems (e.g. Rhine, Meuse, Danube and Mississippi). To ensure a...journal article 2020
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Marijnissen, Richard (author), Esselink, Peter (author), Kok, M. (author), Kroeze, Carolien (author), van Loon-Steensma, J.M. (author)Effective adaptation to sea-level rise is critical for future flood protection. Nature-based solutions including salt marshes have been proposed to naturally enhance coastal infrastructure. A gently sloping grass-covered dike (i.e. Wide Green Dike) can be strengthened with clay accumulating locally in the salt marsh. This study explores the...journal article 2020