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Wagenaar, C. (author)It is of great importance that enemy aircraft can be detected by a radar. Good knowledge about one’s own detectability is also needed to make one’s own visibility as low as possible. Obtaining the aircraft radar signature involves solving a scattering problem with a large, low-observable aircraft. Briefly explained; the incident radar wave...master thesis 2016
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Runia, T.F.H. (author)In this thesis we design, implement and study a high-speed object detection framework. Our baseline detector uses integral channel features as object representation and AdaBoost as supervised learning algorithm. We suggest the implementation of two approximation techniques for speeding up the baseline detector and show their effectiveness by...master thesis 2015
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Nguyen Hoang Kien, N.H.K. (author)In the regularization of ill-posed problems from image restoration, where we want to recover an image from blurred and noisy data, there are many methods that can be useful. Among those, the TRUSTmu method proposed in Rojas and Steihaug, 2002, is an efficient method for solving large-scale regularization problems with additional non-negativity...master thesis 2014
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Van Witteveen, K. (author)This thesis investigates the applicability of the Probabilistic Inference for Learning COntrol (PILCO) algorithm to large systems and systems with time varying measurement noise. PILCO is a state-of-the-art model-learning Reinforcement Learning (RL) algorithm that uses a Gaussian Process (GP) model to average over uncertainties during learning....master thesis 2014
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Ciobanu, C.B. (author)Processor clock frequencies and the related performance improvements recently stagnated due to severe power and thermal dissipation barriers. As a result, the additional transistors provided by new technology generations are turned into more processing elements on a chip and used for their specialization towards power efficiency. For data...doctoral thesis 2013
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Velez Quintero, C.A. (author)In this research a considerable amount of scientific evidence had been collected which leads to the conclusion that the urban wastewater components should be designed as one integrated system, if the protection of the receiving waters is to be achieved cost-effectively. Even more, there is a need to optimize the design and operation of the...doctoral thesis 2012
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Barreto Cordero, W.J. (author)Flooding in urbanized areas has become a very important issue around the world. The level of service (or performance) of urban drainage systems (UDS) degrades in time for a number of reasons. In order to maintain an acceptable performance of UDS, early rehabilitation plans must be developed and implemented. In developing countries the situation...doctoral thesis 2012
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Collignon, T.P. (author)This dissertation deals mainly with the design, implementation, and analysis of efficient iterative solution methods for large sparse linear systems on distributed and heterogeneous computing systems as found in Grid computing. First, a case study is performed on iteratively solving large symmetric linear systems on both a multi–cluster and a...doctoral thesis 2011
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Pham, T.A. (author)Texture, the pattern of information or arrangement of the structure found in an image, is an important feature of many image types.In a general sense, texture refers to surface characteristics and appearance of an object given by the size, shape, density, arrangement, proportion of its elementary parts. Due to the signification of texture...master thesis 2010
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Zhang, L. (author)Stereo matching has been widely used in many fields, such as viewpoint interpolation, feature detection system and free-view TV. However, the long processing time of stereo matching algorithms has been the major bottleneck that limits their real-time applications. During the past decades, many implementation platforms and corresponding algorithm...master thesis 2010
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Van Velzen, N. (author)The accuracy of dynamic simulation models can be increased by using observations in conjunction with a data assimilation or model calibration algorithm. However, implementing such algorithms usually increases the complexity of the model software significantly. By using concepts from object oriented programming, this thesis proposes a software...doctoral thesis 2010
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Van Wijnen, P.A. (author)This thesis presents a feasibility analysis for hardware acceleration of the pattern recognition algorithms used by the Media Knowledge Engineering department at the Delft University of Technology. The feasibility analysis is conducted on a number of different algorithm classes. The Parzen Window algorithm appeared to be the most suitable option...master thesis 2009
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Heule, M.J.H. (author), Van Maaren, H. (author)We show how to exploit the 32/64 bit architecture of modern computers to accelerate some of the algorithms used in satisfiability solving by modifying assignments to variables in parallel on a single processor. Techniques such as random sampling demonstrate that while using bit vectors instead of Boolean values solutions to satisfiable formulae...journal article 2008
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Baur, O. (author), Austen, G. (author), Kusche, J. (author)We develop and apply an efficient strategy for Earth gravity field recovery from satellite gravity gradiometry data. Our approach is based upon the Paige-Saunders iterative least-squares method using QR decomposition (LSQR). We modify the original algorithm for space-geodetic applications: firstly, we investigate how convergence can be...journal article 2007
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Janiga, G. (author), Gordner, A. (author), Shalaby, H. (author), Thevenin, D. (author)The simulation of a two-dimensional laminar methane/air burner using detailed chemistry is presented in this paper. Using detailed chemistry on a growing number of grid elements rapidly leads to a large discretized equation system and to an enourmous computation time. In this case parallel computations are absolutely necessary. Thanks to...conference paper 2006
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Steijl, R. (author), Barakos, G.N. (author), Badcock, K.J. (author)The focus of this paper is on the parallel computing aspects of multi-physics CFD methods and the implications for the design of a CFD framework encompassing mesh-based and particle-based approaches. In the first part of the paper, the shared-memory parallelisation of a multi-block, structured CFD is described and the parallel performance of...conference paper 2006
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Marchandise, E. (author), Geuzaine, P. (author), Remacle, J.F. (author)The simulation of free surface flow is a computationally demanding task. Real life simulations require often the treatment of unstructured grids to capture the complex geometries and the use of parallel supercomputers for the efficient solution. For that aim, we have developed an efficient parallel free surface flow solver based on a full...conference paper 2006
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Darwish, M.S. (author), Saad, T. (author), Hamdan, Z. (author)This paper deals with the implementation and performance analysis of a parallel Algebraic Multigrid Solver (pAMG) for a finite volume unstructured CFD code. The parallelization of the solver is based on the domain decomposition approach using the single program multiple data paradigm. The Message passing interface Library (MPI) is used for...conference paper 2006
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Zibarov, A.V. (author), Karpov, A.N. (author), Medvedev, A.V. (author), Komarov, I.Y. (author), Orlov, D.A. (author)Nowadays numerical simulation of complicated CFD problems by means of parallel computation is widely used all over the world. There are many CFD codes which can work on multiprocessor systems. The GasDynamicsTool (GDT) package developed by the GDT Software Group is one of them. It is meant for the numerical simulation of gas-dynamics processes...conference paper 2006
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Zibarov, A.V. (author), Karpov, A.N. (author), Medvedev, A.V. (author), Komarov, I.Y. (author), Orlov, D.A. (author)Visualization of data is nowadays an indispensable part of scientific research and effect analysis practically in any field of natural sciences. Graphic presentation of the results in the form of color lay-outs or functional dependence diagrams makes it considerably easier to perceive new information and contributes to a more sophisticated and...conference paper 2006