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Koç, Y. (author), Warnier, M. (author), Kooij, R.E. (author), Brazier, F. (author)Cascading failures are the typical reasons of blackouts in power grids. The grid topology plays an important role in determining the dynamics of cascading failures in power grids. Measures for vulnerability analysis are crucial to assure a higher level of robustness of power grids. Metrics from Complex Networks are widely used to investigate the...conference paper 2014
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Wu, T. (author), Toet, A. (author)We present a color-to-gray conversion algorithm that retains both the overall appearance and the discriminability of details of the input color image. The algorithm employs a weighted pyramid image fusion scheme to blend the R, G, and B color channels of the input image into a single grayscale image. The use of simple visual quality metrics as...article 2014
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Adolph, T. (author), Schwedhelm, H. (author), Lazaro, I. (author), Versmissen, A.C.M. (author), Edwards, M. (author), Thomson, R. (author), Johannsen, H. (author)The goal of the project FIMCAR (Frontal Impact and Compatibility Assessment Research) was to define an integrated set of test procedures and associated metrics to assess a vehicle's frontal impact protection, which includes self-And partner-protection. For the development of the set, two different full-width tests (full-width deformable barrier ...article 2014
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Ellens, W. (author), Kooij, R.E. (author)Network robustness research aims at finding a measure to quantify network robustness. Once such a measure has been established, we will be able to compare networks, to improve existing networks and to design new networks that are able to continue to perform well when it is subject to failures or attacks. In this paper we survey a large amount of...article 2013
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Tak, S. (author), Cockburn, A. (author)Abstract—Treemaps are a well known and powerful space-filling visualisation method for displaying hierarchical data. Many alternative treemap algorithms have been proposed, often with the aim being to optimise performance across several criteria, including spatial stability to assist users in locating and monitoring items of interest. In this...article 2013
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Koç, Y. (author), Warnier, M. (author), Kooij, R.E. (author), Brazier, F.M.T. (author)The cascading failure phenomenon in a power grid is related to both the structural aspects (number and types of buses, density of transmission lines and interconnection of components), and the operative state (flow distribution and demand level). Existing studies most often focus on structural aspects, and not on operative states. This paper...article 2013
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- Alapaty, K. (author), Mathur, R. (author), Pleim, J. (author), Hogrefe, C. (author), Rao, S.T. (author), Ramaswamy, V. (author), Galmarini, S. (author), Schaap, M. (author), Makar, P. (author), Vautard, R. (author), Baklanov, A. (author), Kallos, G. (author), Vogel, B. (author), Sokhi, R. (author) article 2012
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de Smidt-Destombe, K.S. (author), van Elst, N.P. (author), Barros, A.I. (author), Mulder, H. (author), Hontelez, J.A.M. (author)This paper presents a variant of a spare parts inventory model with cold stand-by redundancy on system level. Redundancy on system level implies that not all systems need to be operational in order to have the whole system operational. The cold stand-by feature implies that only the minimum required systems are operational. In order to determine...article 2011
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Krishnan, S. (author), Kerkhoff, H.G. (author)Mahalanobis distance is one of the commonly used multivariate metrics for finely segregating defective devices from non-defective ones. An associated problem with this approach is the estimation of a robust mean and a covariance matrix. In the absence of such robust estimates, especially in the presence of outliers to test-response measurements,...conference paper 2011
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Fay, D. (author), Haddadi, H. (author), Moore, A.W. (author), Mortier, R. (author), Uhlig, S. (author), Jamakovic, A. (author), TNO Informatie- en Comunicatietechnoloie (author)Comparison of graph structures is a frequently encountered problem across a number of problem domains. Comparing graphs requires a metric to discriminate which features of the graphs are considered important. The spectrum of a graph is often claimed to contain all the information within a graph, but the raw spectrum contains too much information...article 2010
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Fay, D. (author), Haddadi, H. (author), Thomason, A. (author), Moore, A.W. (author), Mortier, R. (author), Jamakovic, A. (author), Uhlig, S. (author), Rio, M. (author), TNO Informatie- en Communicatietechnologie (author)Comparing graphs to determine the level of underlying structural similarity between them is a widely encountered problem in computer science. It is particularly relevant to the study of Internet topologies, such as the generation of synthetic topologies to represent the Internet's AS topology. We derive a new metric that enables exactly such a...article 2010
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Leskens, M. (author), de Kruif, B. (author), Belfroid, S.P.C. (author), Smeulers, J.P.M. (author), Gryzlov, A. (author), TNO Industrie en Techniek (author)Multiphase flow meters are indispensable tools for achieving optimal operation and control of wells as these meters deliver real-time information about their performance. For example, multiphase flow meters located downhole can improve the production of multilateral and multizone wells by timely allocating the zone where a gas or water cone...conference paper 2008
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Raaijmakers, S. (author), TNO Informatie- en communicatietechnologie (author)Information diffusion kernels - similarity metrics in non-Euclidean information spaces - have been found to produce state of the art results for document classification. In this paper, we present a novel approach to global sentiment classification using these kernels. We carry out a large array of experiments addressing the well-known movie...conference paper 2007
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Miedema, H.M.E. (author), Borst, H.C. (author), TNO Bouw en Ondergrond (author)A system that rates noise on the basis of noise maps has been developed which is based on empirical exposure-response relationships, so that effects in the community will be lower if the system gives a better rating. It is consistent with noise metrics and effect endpoint chosen in the EU, i.e., it uses L</field>den and L</field>night and...conference paper 2006
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Brümmer, Niko (author), van Leeuwen, D.A. (author), TNO Defensie en Veiligheid (author)Recent publications have examined the topic of calibration of confidence scores in the field of (binary-hypothesis) speaker detection. We extend this topic to the case of multiple-hypothesis language recognition. We analyze the structure of multiple-hypothesis recognition problems to show that any such problem subsumes a multitude of derived sub...conference paper 2006
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TNO Defensie en Veiligheid (author), Roza, M. (author), van Emmerik, M. (author), Voogd, J.M. (author)The REVVA methodology, developed in the WEAG THALES Joint Program 11.20, provides a framework for verification and validation activities resulting in an acceptance recommendation for data, models and simulations. The core of the methodology is the decomposition of the 'intended purpose' into acceptability criteria (AC). The V&V effort focuses on...conference paper 2006
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Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author), Miller, B. (author)We present a new measure called target identifiability, as an efficient alternative for measuring identification scores. Identifiability is operationally defined as the amount of blur required to reduce the target signature to its identification threshold. It can quickly be determined using a simple adjustment procedure. To validate the new...conference paper 2004
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Toet, A. (author), Bijl, P. (author), Valeton, J.M. (author)The TNO Human Factors Searchû2 image dataset consists of: a set of 44 high-resolution digital color images of different complex natural scenes, the ground truth corresponding to each of these scenes, and the results of psychophysical experiments on each of these images. The images in the Searchû2 dataset are a subset of a larger set that has...article 2001
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Passchier-Vermeer, W. (author), Passchier, W.F. (author), TNO Preventie en Gezondheid (author)Exposure to noise constitutes a health risk. There is sufficient scientific evidence that noise exposure can induce hearing impairment, hypertension and ischemic heart disease, annoyance, sleep disturbance, and decreased school performance. For other effects such as changes in the immune system and birth defects, the evidence is limited. Most...article 2000
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TNO Human Factors Research Institute TNO Fysisch en Elektronisch Laboratorium (author), Bijl, P. (author), Valeton, J.M. (author), de Jong, A.N. (author)Identification and recognition performance for four staring and two scanning thermal imagers, were measured in an observer experiment using images that were collected during a NATO field trial in Nettuno, Italy, in 1998. The dataset allows validation of the MRTD and alternative sensor performance measures such as the TOD (Triangle Orientation...conference paper 2000