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Anitori, L. (author), Maleki, A. (author), Otten, M.P.G. (author), Baraniuk, R.G. (author), Hoogeboom, P. (author)We consider the problem of target detection from a set of Compressed Sensing (CS) radar measurements corrupted by additive white Gaussian noise. We propose two novel architectures and compare their performance by means of Receiver Operating Characteristic (ROC) curves. Using asymptotic arguments and the Complex Approximate Message Passing (CAMP)...article 2013
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Helmholt, K.A. (author), Courage, W.M.G. (author)Underground infrastructures can fail due to ground movements. Due to the underground nature this is difficult to detect above ground. In a collaboration of multiple research institutes a new approach has been developed to estimate the probability of failure using underground position sensors. A Proof of Principle monitoring system was developed...conference paper 2013
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Hogervorst, M.A. (author), Toet, A. (author), Bijl, P. (author)We investigate how human visual search performance with field of view (FOV) restrictions depends on scan speed, zoom factor, target location, and conspicuity. First, observers search a FOV that moves at a constant speed along a predefined path over a visual search scene (the field of regard, or FOR), and we measure the effects of scan speed,...article 2013
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Zouch, M. (author), Courage, W. (author), Nápoles, O.M. (author)We present a framework to investigate new monitoring techniques for infrastructures and assess their potential value for the network management. This framework is based on a social cost benefit analysis tool that aims to (i) assist decision makers in selecting and developing cost-effective new monitoring techniques and (ii) provide managers with...article 2013
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Toet, A. (author), Hogervorst, M.A. (author)We present a new method to derive a multiscale urban camouflage pattern from a given set of background image samples. We applied this method to design a camouflage pattern for a given (semi-arid) urban environment. We performed a human visual search experiment and a computational evaluation study to assess the effectiveness of this multiscale...article 2013
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Grossiord, N. (author), Kroon, J.M. (author), Andriessen, H.A.J.M. (author), Blom, P.W.M. (author)In the present review, the main degradation mechanisms occurring in the different layer stacking (i.e. photoactive layer, electrode, encapsulation film, interconnection) of polymeric organic solar cells and modules are discussed. Bulk and interfacial, as well as chemical and physical degradation mechanisms are reviewed, as well as their...article 2012
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Klein Wolterink, W. (author), Heijenk, G. (author), van den Berg, J.L. (author)In this paper we present an analytical model accurately describing the behaviour of a multi-hop broadcast protocol. Our model covers the scenario in which a message is forwarded over a straight road and inter-node distances are distributed exponentially. Intermediate forwarders draw a small random delay before forwarding a message such as is...conference paper 2012
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Anitori, L. (author), Otten, M.P.G. (author), van Rossum, W.L. (author), Maleki, A. (author), Baraniuk, R. (author)In this paper we develop the first Compressive Sensing (CS) adaptive radar detector. We propose three novel architectures and demonstrate how a classical Constant False Alarm Rate (CFAR) detector can be combined with ℓ1-norm minimization. Using asymptotic arguments and the Complex Approximate Message Passing (CAMP) algorithm we characterize the...conference paper 2012
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Ellens, W. (author), Zivkovic, M. (author), Akkerboom, J.D. (author), Litjens, R. (author), van den Berg, J.L. (author)In this paper we consider the general problem of resource provisioning within cloud computing. We analyze the problem of how to allocate resources to different clients such that the service level agreements (SLAs) for all of these clients are met. A model with multiple service request classes generated by different clients is proposed to...conference paper 2012
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Anitori, L. (author), Otten, M.P.G. (author), Hoogeboom, P. (author)In this paper false alarm probability (FAP) estimation of a radar using Compressive Sensing (CS) in the frequency domain is investigated. Compressive Sensing is a recently proposed technique which allows reconstruction of sparse signal from sub-Nyquist rate measurements. The estimation of the FAP is based on an empirical model derived from...conference paper 2011
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Haas, F.J.L.M. (author), Schutgens, R.E.G. (author), Kluft, C. (author), Biesma, D.H. (author)Introduction. The exclusion of deep venous thrombosis (DVT) by pre-test probability (PTP) and D-dimer in the elderly is safe, but has a low specificity. There is increasing interest in the diagnostic role of thrombin generation in patients with thrombosis. We evaluated the value of thrombin generation in the exclusion of DVT, especially in...article 2011
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Baart, F. (author), Bakker, M.A.J. (author), van Dongeren, A. (author), den Heijer, C. (author), van Heteren, S. (author), Smit, M.W.J. (author), van Koningsveld, M. (author), Pool, A. (author)For the design of cost-effective coastal defence a precise estimate is needed of the 1/10 000 per year storm surge. A more precise estimate requires more observations. Therefore, the three greatest storm surges that hit the northern part of the Holland Coast in the 18th century are reconstructed. The reconstructions are based on paintings,...article 2011
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Steenbergen, R.D.J.M. (author), de Boer, A. (author), van der Veen, C. (author)Evaluating and upgrading concrete slab bridges is an important issue. A large part of the existing infrastructure has been built about 50 years ago and the design life has been reached or will be reached in the near future. Also traffic loads have increased significantly over the last 50 years. These structures need to be reassessed in order to...conference paper 2011
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Faber, M.H. (author), Vrouwenvelder, A.C.W.M. (author), Sørensen, J.D. (author), Chryssanthopoulos, M.K. (author), Narasimhan, H. (author)In 2005, the Joint Committee on Structural Safety (JCSS) together with Working Commission (WC) 1 of the International Association of Bridge and Structural Engineering (IABSE) organized a workshop on robustness of structures. Two important decisions resulted from this workshop, namely the development of a joint European project on structural...conference paper 2011
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Toet, A. (author), TNO Defensie en Veiligheid (author)The recently introduced TSSIM clutter metric is currently the best predictor of human visual search performance for natural images (Chang and Zhang [1]). The TSSIM quantifies the similarity of a target to its background in terms luminance, contrast and structure. It correlates stronger with experimental mean search times and detection...article 2010
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van den Broek, T.H.A. (author), Ploeg, J. (author)In this paper, a collision warning method between the host vehicle and target object(s) is studied. A probabilistic collision warning method is proposed, which is, in particular, useful for objects, e.g. vulnerable road users, which trajectories can rapidly change heading and/or velocity with respect to time. A vehicle is equipped with the...conference paper 2010
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Nepveu, M. (author), Kroon, I.C. (author), Fokker, P.A. (author), TNO Bouw en Ondergrond (author)We present a general framework that enables decision-making when a threshold in a process is about to be exceeded (an event). Measurements are combined with prior information to update the probability of such an event. This prior information is derived from the results of an ensemble of model realisations that span the uncertainty present in the...article 2010
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Moet, D.J.D. (author), Lenes, M. (author), Morana, M. (author), Azimi, H. (author), Brabec, C.J. (author), Blom, P.W.M. (author), TNO Industrie en Techniek (author)The improved photovoltaic performance of narrow band gap polymer:fullerene solar cells processed from solutions containing small amounts of 1,8-octanedithiol is analyzed by modeling of the experimental photocurrent. In contrast to devices that are spin coated from pristine chlorobenzene, these cells do not produce a recombination-limited...article 2010
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van Buuren, S. (author), Ooms, J.C.L. (author), TNO Kwaliteit van Leven (author)This paper presents a method for calculating stage line diagrams, a novel type of reference diagram useful for tracking developmental processes over time. Potential fields of applications include: dentistry (tooth eruption), oncology (tumor grading, cancer staging), virology (HIV infection and disease staging), psychology (stages of cognitive...article 2009
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Bloom, J.G.P. (author), Stelwagen, U. (author), Mast, A. (author), Volker, A.W.F. (author), Krom, A.H.M. (author), Mohamoud, A.A. (author), van Gils, G.P. (author), TNO Industrie en Techniek (author)Risk based inspection strategies rely on detailed knowledge of the performance of inspection techniques. It is well known that every inspection technique has limitations in terms of reliability and effectiveness. Moreover, these are influenced by many factors. E.g. it depends on operator skills, inspection procedure, defect and object geometry...conference paper 2009