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van der Stel, Stefan D. (author), Lai, Marco (author), Groen, Harald C. (author), Witteveen, Mark (author), Kuhlmann, Koert F.D. (author), Grotenhuis, Brechtje A. (author), Kok, Niels F.M. (author), van Gastel, Mark (author), Hendriks, B.H.W. (author), Ruers, Theo J.M. (author)Introduction: Anastomotic leakage after gastrointestinal surgery has a high impact on patient's quality of life and its origin is associated with inadequate perfusion. Imaging photoplethysmography (iPPG) is a noninvasive imaging technique that measures blood-volume changes in the microvascular tissue bed and detects changes in tissue...journal article 2023
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van Oorschot, Janneke (author), Sprecher, Benjamin (author), Rijken, Bart (author), Witteveen, Pieter (author), Blok, Merlijn (author), Schouten, Nico (author), van der Voet, Ester (author)Buildings are an important part of society's environmental impacts, both in the construction and in the use phase. As the energy performance of buildings improve, construction materials become more important as a cause of environmental impact. Less attention has been given to those materials. We explore, as an alternative for conventional...journal article 2023
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The effect of China’s plastic waste import ban on plastic waste leakage into the aquatic environmentWitteveen, Pieter (author)Many higher-income countries export plastic waste to lower and middle-income countries where treatment facilities are often less advanced, which therefore comes with greater environmental consequences. China was the largest importer of plastic waste until it issued the Prohibition of Foreign Garbage Imports (referred to as "the China import ban"...master thesis 2022
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Witteveen, Beer (author)A large portion of the global population, mostly in the Sub-Saharan African region, still has no access to electricity. Due to the remoteness and limited accessibility of some communities, off-grid solutions such as mini-grids are required to electrify these regions. An essential part of such an isolated mini-grid is the energy storage system....master thesis 2020
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Linear power flow method improved with numerical analysis techniques applied to a very large networkSereeter, B. (author), van Westering, W.H.P. (author), Vuik, Cornelis (author), Witteveen, C. (author)In this paper, we propose a fast linear power flow method using a constant impedance load model to simulate both the entire Low Voltage (LV) and Medium Voltage (MV) networks in a single simulation. Accuracy and efficiency of this linear approach are validated by comparing it with the Newton power flow algorithm and a commercial network design...journal article 2019
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Sereeter, B. (author), Vuik, Cornelis (author), Witteveen, C. (author)A general framework is given for applying the Newton–Raphson method to solve power flow problems, using power and current-mismatch functions in polar, Cartesian coordinates and complex form. These two mismatch functions and three coordinates, result in six possible ways to apply the Newton–Raphson method for the solution of power flow...journal article 2019
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Sereeter, B. (author), Vuik, Cornelis (author), Witteveen, C. (author), Palensky, P. (author)In this paper, we study four equivalent mathematical formulations of the Optimal Power Flow (OPF) problem and their impacts on the performance of solution methods. We show how four mathematical formulations of the OPF problem can be obtained by rewriting equality constraints given as the power flow problem into four equivalent mathematical...conference paper 2019
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Grzelak, L.A. (author), Witteveen, J.A.S. (author), Oosterlee, C.W. (author), Suárez-Taboada, M. (author)In this article, we propose an efficient approach for inverting computationally expensive cumulative distribution functions. A collocation method, called the Stochastic Collocation Monte Carlo sampler (SCMC sampler), within a polynomial chaos expansion framework, allows us the generation of any number of Monte Carlo samples based on only a...journal article 2018
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Suárez-Taboada, María (author), Witteveen, Jeroen A.S. (author), Grzelak, L.A. (author), Oosterlee, C.W. (author)In this paper, we study the impact of the parameters involved in Heston model by means of Uncertainty Quantification. The Stochastic Collocation Method already used for example in computational fluid dynamics, has been applied throughout this work in order to compute the propagation of the uncertainty from the parameters of the model to the...journal article 2018
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Virgolin, M. (author), Alderliesten, Tanja (author), Bel, Arjan (author), Witteveen, C. (author), Bosman, P.A.N. (author)The recently introduced Gene-pool Optimal Mixing Evolutionary Algorithm for Genetic Programming (GP-GOMEA) has been shown to find much smaller solutions of equally high quality compared to other state-of-the-art GP approaches. This is an interesting aspect as small solutions better enable human interpretation. In this paper, an adaptation of...conference paper 2018
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Witteveen, Annemieke (author), Nane, G.F. (author), Vliegen, Ingrid M.H. (author), Siesling, Sabine (author), IJzerman, Maarten J. (author)Purpose. For individualized follow-up, accurate prediction of locoregional recurrence (LRR) and second primary (SP) breast cancer risk is required. Current prediction models employ regression, but with large data sets, machine-learning techniques such as Bayesian Networks (BNs) may be better alternatives. In this study, logistic regression...journal article 2018
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Witteveen, Evelien (author)Rembrandt was a unique painter of his era, and one of his most outstanding pieces is The Jewish Bride. He mastered the art of manipulating pigments to create unique paint mixtures and textures. This can be seen in his painting, The Jewish Bride.<br/>In the background of The Jewish Bride, Rembrandt mixed five pigments together: bone black, red...master thesis 2017
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Sereeter, B. (author), Vuik, Cornelis (author), Witteveen, C. (author)Two mismatch functions (power or current) and three coordinates (polar, Cartesian andcomplex form) result in six versions of the Newton–Raphson method for the solution of powerflow problems. In this paper, five new versions of the Newton power flow method developed forsingle-phase problems in our previous paper are extended to three-phase power...journal article 2017
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Witteveen, R.F.W. (author)This thesis is written in the context of a world in which renewable energy assumes an ever growing share within the Dutch electricity sector. Given the fluctuating output of renewable energy sources, the importance of the Dutch secondary reserve capacity market is expected to increase considerably in upcoming years. Its architecture, a monopsony...master thesis 2016
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Plesa, C. (author), Verschueren, D.V. (author), Pud, S. (author), van der Torre, J. (author), Ruitenberg, J.W. (author), Witteveen, M.J. (author), Jonsson, P.M. (author), Grosberg, Alexander Y. (author), Rabin, Yitzhak (author), Dekker, C. (author)Long DNA molecules can self-entangle into knots. Experimental techniques for observing such DNA knots (primarily gel electrophoresis) are limited to bulk methods and circular molecules below 10 kilobase pairs in length. Here, we show that solid-state nanopores can be used to directly observe individual knots in both linear and circular single...journal article 2016
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- Virgolin, M. (author), Dijk van, Irma (author), Wiersma, Jan (author), Ronckers, Cecile (author), Witteveen, C. (author), Rasch, Coen (author), Bel, Arjan (author), Alderliesten, Tanja (author), Bosman, P.A.N. (author) conference paper 2016
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- Witteveen, A.M. (author) master thesis 2014
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Witteveen, M.J. (author)Motivation: Identification and elucidation of eQTL has long been an active area of research. Finding cis-eQTL has been a manageable problem because of the limited number of candidates. Finding transeQTL has on the other hand been much more challenging because of the issue of multiple hypothesis testing. It has been suggested that additional...master thesis 2014
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Tang, J.M. (author), Vuik, C. (author), Witteveen, C. (author)In this report, the recent and future contributions of experts and groups of Delft University of Technology (DUT) on the topic of smart grids (SG) are presented. This may provide guidelines on how DUT can contribute in current and future SG projects, such as the current TKI project on “Smart Grid Evolution (SGE): Developing a service platform...report 2014
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Kreutzberger, E.D. (author), Konings, J.W. (author), Meijer, S. (author), Witteveen, C. (author), Meijers, B.M. (author), Pekin, E. (author), Macharis, C. (author), Kiel, J. (author), Kawabata, Y. (author), Vos, W. (author)This report is the first deliverable of the project Intermodal Rail Freight Twin Hub Network Northwest Europe. We call its subject Twin hub network and the organisational entity to carry out the actions the Twin hub project. The project is funded by INTERREG NWE (programme IVb). Its work started in December 2011 and will end by the end of 2015....report 2014