Searched for: subject%3A%22Computational%255C%2Bmethods%22
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Konings, L. (author), Kuipers, T. (author), Thepass, S. (author)
Future conflicts will increasingly take place in complex, urban environments. This calls for a change from operating in large formations and from static encampments to dispersed, networked, decentralized and small-scale operations. Concept development for dispersed operations and their accompanying strategies has only just begun. To aid in this...
conference paper 2022
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Davydenko, I.Y. (author), Fransen, R.W. (author)
Deep sea international ports are competitive businesses serving the transshipment needs of shipping lines linking seaborne freight with hinterland connections. The level of service is one of the important decision factors for the shipping lines' decision on whether to call at a port. Therefore, port performance is a vital competitive component...
conference paper 2019
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Wedley, W.C. (author), Choo, E.U. (author), Wijnmalen, D.J.D. (author)
The true pairwise comparison matrix is simulated and used as a benchmark for evaluating different priority vectors derived from a decision maker's pairwise comparison matrix. The accuracy of the decision maker's comparisons are progressively improved until they emulate the true values. Using four different distance measures to evaluate five...
article 2016
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Attema, T. (author), van Maanen, P.P. (author), Meeuwissen, E. (author)
This paper concerns multi-agent models predicting Twitter trends. We use a step-wise approach to develop a novel agent-based model with the following properties: (1) it uses individual behavior parameters for a set of Twitter users and (2) it uses a retweet graph to model the underlying social network structure of these Twitter users to predict...
conference paper 2015
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Worm, D. (author), Langley, D.J. (author), Becker, J. (author)
The aim of this paper is to improve scientific modeling of interdependent socio-technical networks. In these networks the interplay between technical or infrastructural elements on the one hand and social and behavioral aspects on the other hand, plays an important role. Examples include electricity networks, financial networks, residential...
conference paper 2014
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van den Berg, R.L.J. (author), Steenbergen, R.D.J.M. (author)
In this paper, a damping model for a high-rise building is introduced. This model is used to investigate the possibilities to identify the relative damping contribution of the internal material damping in building elements, energy loss at element interfaces and energy outflow at the interface with the ground. The building is modeled as an Euler...
conference paper 2013
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Kalkman, I.M. (author), Lentzen, S.S.K. (author), Courage, W.M.G. (author), Napoles, O.M. (author), Galanti, F.M.B. (author)
In general the condition of a structure can be assessed in terms of a performance indicator. For example, this can be the strength of a structure. An asset manager is concerned with ensuring that the performance of a structure does not fall below a given minimum level. This can be achieved by inspecting or monitoring the structure. As the...
conference paper 2011
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Meekes, J.A.C. (author), Zhang, X. (author), Abdul Fattah, R. (author)
Geophysical monitoring of the dynamical behavior of subsurface reservoirs (oil, gas, CO2) remains an important issue in geophysical research. A new idea for reservoir monitoring based on electrical resistivity tomography was developed at TNO. The essential element of the so-called BSEMT (Borehole to Surface Electrical Monitoring Technique)...
conference paper 2011
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van der Meer, B. (author), Egberts, P. (author), TNO Bouw en Ondergrond (author)
Often we need to know how much CO2 we can store in a certain underground space, or how much such space we need to store a given amount of CO2. In a recent attempt (Bradshaw et al., 2006) to list various regional and global estimates of CO2 storage capacity (Figure 1), the estimates reported are often quoted as "very large" with ranges in the...
article 2008
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Smit, R. (author), Poelman, M. (author), Schrijver, J. (author), TNO Bouw en Ondergrond (author)
Does consideration of average speed distributions on roads-as compared to single mean speed-lead to different results in emission modelling of large road networks? To address this question, a post-processing method is developed to predict mean speed distributions using available traffic data from a dynamic macroscopic traffic model (Indy) that...
article 2008
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Vermeulen, P.T.M. (author), Heemink, A.W. (author), Valstar, J.R. (author)
Numerical groundwater flow models often have a very high number of model cells (greater than a million). Such models are computationally very demanding, which is disadvantageous for inverse modeling. This paper describes a low-dimensional formulation for groundwater flow that reduces the computational burden necessary for inverse modeling. The...
article 2005
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Rhebergen, J.B. (author), van Wijk, R. (author)
During the past couple of years, several GPR data sets have been acquired at the TNO-FEL test-site "Waalsdorp". Simultaneously a detection algorithm, based on autoregressive modelling has been developed and implemented. This algorithm first determines a measure of the information content of data from known mine locations, by means of minimum...
conference paper 2004
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Zijl, W. (author), Nawalany, M. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)
We present a velocity-oriented discrete analog of the partial differential equations governing porous media flow: the edge-based face element method. Conventional finite element techniques calculate pressures in the nodes of the grid. However, such methods do not satisfy the requirement of flux continuity at the faces. In contrast, the edge...
article 2004
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Ainslie, M.A. (author), Robins, A.J. (author), Simons, D.G. (author), TNO Fysisch en Elektronisch Laboratorium (author)
A compilation of analytical formulas is presented, describing ray properties of a family of sediment sound speed profiles. The profiles are described as "generalized power law" profiles because they are generalizations of a similar family of simpler power law profiles considered in earlier work [M. A. Ainslie, J. Acoust. Soc. Am. 96, 2506–2515 ...
article 2004
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Technisch Physische Dienst TNO - TH (author), Haagh, G.A.A.V. (author), Peters, G.W.M. (author), van de Vosse, F.N. (author), Meijer, H.E.H. (author)
Although gas-assisted injection molding (GAIM) has been practiced in industry for more than a decade, the process is not completely understood, particularly with respect to the gas penetration mechanism. Consequently, mold design and process control are often governed by trial-and-error, and reliable information on the gas distribution and the...
article 2004
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Lubelli, B. (author), van Hees, R.P.J. (author), Brocken, H.J.P. (author)
Salt crystallisation is one of the main causes of masonry decay in monuments. The salt content in a wall is a very important parameter that should be known in order to give a reliable diagnosis on the causes of damage; if a restoration work and a surface treatment are necessary, the salt content has to be known. In fact the presence of salts in...
article 2004
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TNO Technische Menskunde (author), Toet, A. (author), Hogervorst, M.A. (author), Bijl, P. (author)
We argue that visual conspicuity and identifiability are two efficient task-related measures that can be deployed to calibrate synthetic imagery that is intended to be used for human visual search and detection tasks. The conspicuity of a target is operationally defined as the region around the center of the visual field where the target is...
conference paper 2004
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Nijkerk, M.D. (author), Kruit, P. (author)
A Monte Carlo simulation tool, which was used to evaluate the influence of discrete space charge effects on self-consistent calculations of cathode-ray tube optics, was discussed. It was found that interactions in the space charge cloud affect the electron trajectories such that the velocity distribution is Maxwellian, regardless of the current...
article 2004
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Golliard, J. (author), Technisch Physische Dienst TNO - TH (author)
In this paper, the impedance of a rectangular opening submitted to a turbulent grazing flow is investigated experimentally. The opening is located in a flat plate where a turbulent boundary layer flow develops. The impedance is measured with a two-microphone measuring pipe installed below the opening. The opening has a rectangular shape of large...
conference paper 2003
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van den Berg, P.M. (author), Korkmaz, E. (author), Abubakar, A. (author)
It is well-known that electromagnetic solutions of boundary integral equations for perfectly electrically conducting scatterers are nonunique for those frequencies which correspond to interior resonances of the scatterer. In this paper a simple and efficient computational method is developed, in which the interior integral representations,...
article 2003
Searched for: subject%3A%22Computational%255C%2Bmethods%22
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