Searched for: author%3A%22Kok%2C+M.%22
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van der Krogt, M.G. (author), Schweckendiek, T. (author), Kok, M. (author)
During construction of a dike, slope stability often reaches critical levels, due to the excess pore water pressures in the foundation. The loading condition during construction has similarities with the design conditions during flood loading. Not only in terms of the pore water pressures as the main driving force, but also in terms of...
journal article 2021
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Klerk, W.J. (author), Kanning, W. (author), Kok, M. (author), Bronsveld, J. (author), Wolfert, A.R.M. (author)
Prioritisation of flood defence maintenance is typically based on visual inspection. However, literature shows that the Probability of Detection (PoD) of visual inspection can vary significantly. Here we investigate the PoD for visual inspections of flood defence structures, the consistency of damage classification, and the influence of...
journal article 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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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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Klerk, W.J. (author), Kanning, W. (author), Kok, M. (author), Wolfert, A.R.M. (author)
Climate change and deterioration require a continuous effort to reinforce flood defences and meet reliability requirements. To efficiently upgrade flood defence systems, insight in costs and benefits of measures at a system level is required throughout the process of planning and design. Due to the size of flood defence systems the number of...
journal article 2021
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van Dijk, M.P. (author), Kok, M. (author), Berger, Monique A.M. (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author)
In sports, inertial measurement units are often used to measure the orientation of human body segments. A Madgwick (MW) filter can be used to obtain accurate inertial measurement unit (IMU) orientation estimates. This filter combines two different orientation estimates by applying a correction of the (1) gyroscope-based estimate in the...
journal article 2021
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Weygers, Ive (author), Kok, M. (author), Seel, Thomas (author), Shah, Darshan (author), Taylan, Orçun (author), Scheys, Lennart (author), Hallez, Hans (author), Claeys, Kurt (author)
Skin-attached inertial sensors are increasingly used for kinematic analysis. However, their ability to measure outside-lab can only be exploited after correctly aligning the sensor axes with the underlying anatomical axes. Emerging model-based inertial-sensor-to-bone alignment methods relate inertial measurements with a model of the joint to...
journal article 2021
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Jonkman, Sebastiaan N. (author), Moll, J.R. (author), 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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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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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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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
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Marijnissen, Richard (author), Kok, M. (author), Kroeze, Carolien (author), van Loon-Steensma, J.M. (author)
Integrating natural components in flood defence infrastructure can add resilience to sea-level rise. Natural foreshores can keep pace with sea-level rise by accumulating sediment and attenuate waves before reaching the adjacent flood defences. In this study we address how natural foreshores affect the future need for dike heightening. A...
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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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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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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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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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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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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Solin, Arno (author), Kok, M. (author)
Gaussian processes (GPs) provide a powerful framework for extrapolation, interpolation, and noise removal in regression and classification. This paper considers constraining GPs to arbitrarily-shaped domains with boundary conditions. We solve a Fourier-like generalised harmonic feature representation of the GP prior in the domain of interest,...
conference paper 2019
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Klerk, W.J. (author), Schweckendiek, T. (author), den Heijer, Frank (author), Kok, M. (author)
One of the most rapidly emerging measures in infrastructure asset management is Structural Health Monitoring (SHM), which aims at reducing uncertainty in structural performance by using monitoring equipment. As earthen flood defence structures typically have large strength uncertainties, such techniques can be particularly promising. However,...
journal article 2019
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