Searched for: author:"Kok, M."
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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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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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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), 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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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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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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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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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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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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Girrbach, Fabian (author), Zandbergen, Raymond (author), Kok, M. (author), Hageman, Tijmen (author), Bellusci, Giovanni (author), DIehl, Moritz (author)
Inertial sensors are used in an increasing number of autonomous applications. Integrating such sensors into dynamic systems, the problem of their calibration arises naturally. Existing methods often require the sensor to be accurately placed in certain poses, which can be infeasible in practice. In this paper, we present an optimization-based...
conference paper 2019
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Yunika, A. (author), Kok, M. (author), de Gijt, J.G. (author), Huizinga, J. (author), Ginting, S. (author)
Digital Elevation Model (DEM) is an important component in flood inundation modelling as a part of flood risk analysis. However, Digital Surface Model (DSM) which still contains noises of artefacts is more common to be available than DEM. Then DSM misleads the inundation extent. This study will evaluate a measure to obtain a bare-earth...
journal article 2019
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Lorenz, Michael (author), Taetz, Bertram (author), Kok, M. (author), Bleser, Gabriele (author)
This paper presents a study of the behavior of seven different attitude representations in a batchwise orientation smoothing problem. The representations include the well-known unit quaternions and rotation vectors(/axis-angle), as well as modified Rodrigues parameters (MRPs). We consider error states as well as direct orientation formulations...
conference paper 2019
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Nowka, Danny (author), Kok, M. (author), Seel, Thomas (author)
In inertial motion tracking of kinematic chains, inertial measurement units (IMUs) are attached to each segment in order to track their motion in three-dimensional space. Determining the relations between the functional axes of a joint and the local coordinate system of the attached sensor is a crucial requirement. For the case of hinge...
conference paper 2019
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Marijnissen, R.J.C. (author), Kok, M. (author), Kroeze, Carolien (author), van Loon-Steensma, J.M. (author)
It is not uncommon for a flood defence to be combined with other societal uses as a multifunctional flood defence, from housing in urban areas to nature conservation in rural areas. The assessment of the safety of multifunctional flood defences is often done using conservative estimates. This study synthesizes new probabilistic approaches to...
journal article 2019
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Kok, M. (author), Schön, Thomas B. (author)
We present a novel algorithm for online, real-time orientation estimation. Our algorithm integrates gyroscope data and corrects the resulting orientation estimate for integration drift using accelerometer and magnetometer data. This correction is computed, at each time instance, using a single gradient descent step with fixed step length. This...
journal article 2019
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van der Krogt, M.G. (author), Schweckendiek, T. (author), Kok, M. (author)
One of the failure mechanisms of dikes is slope instability at the landward side. Often, one instability does not lead to flooding, and several successive instabilities are needed before the dike overtops, and erosion and breaching can occur, especially at lower water levels. In this paper we propose a method to estimate the probability of...
conference paper 2019
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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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Kok, M. (author), van de Riet, O. (author), Walker, W.E. (author)
Here we examine whether a study conducted 25 years ago (1992) would have had different conclusions if concepts and analytical methods developed since then had been used. The 1992 problem was to identify a strategy for reducing flood risk in the Netherlands by, for example, strengthening the river dikes against the risk of flooding. Since then,...
journal article 2019
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Curran, A.N. (author), de Bruijn, Karin M. (author), Klerk, W.J. (author), Kok, M. (author)
To make informed flood risk management (FRM) decisions in large protected river systems, flood risk and hazard analyses should include the potential for dike breaching. 'Load interdependency' analyses attempt to include the system-wide effects of dike breaching while accounting for the uncertainty of both river loads and dike fragility. The...
journal article 2019
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Lendering, K.T. (author), Sebastian, Antonia (author), Jonkman, Sebastiaan N. (author), Kok, M. (author)
The application of risk-based approaches for the design of flood infrastructure has become increasingly common in flood management. This approach, based on risk reduction and reliability, is used to assess the performance of conventional interventions (e.g., flood defences and dams) and to support decisions regarding their implementation....
journal article 2018
Searched for: author:"Kok, M."
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