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Wapenaar, C.P.A. (author), Brackenhoff, J. (author), De Ridder, S. (author), Slob, E.C. (author), Snieder, R. (author)
Green’s functions and propagator matrices are both solutions of the wave equation, but whereas Green’s functions obey a causality condition in time (G = 0 for t < 0), propagator matrices obey a boundary condition in space. Marchenko-type focusing functions focus a wave field in space at zero time. We discuss the mutual relations between Green...
conference paper 2023
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Lago, Jesus (author), De Brabandere, Karel (author), De Ridder, Fjo (author), De Schutter, B.H.K. (author)
In recent years, as the share of solar power in the electrical grid has been increasing, accurate methods for forecasting solar irradiance have become necessary to manage the electrical grid. More specifically, as solar generators are geographically dispersed, it is very important to have general models that can predict solar irradiance without...
conference paper 2018
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Wijntjes, M.W.A. (author), De Ridder, H. (author)
Whereas the 17th century painter Canaletto was a master in linear perspective of the architectural elements, he seems to have had considerable difficulty with linear perspective of shadows. A common trick to avoid shadow perspective problems is to set the (solar) illumination direction parallel to the projection screen. We investigated in one...
conference paper 2014
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Van Egmond, R. (author), De Ridder, H. (author), Pappas, T.N. (author), Silva, P.M. (author)
We investigate the effect of contrast enhancement on the subjective roughness of visual textures. Our analysis is based on subjective experiments with seventeen images from the CUReT database in three variants: original, synthesized textures, and contrast-enhanced synthesized textures. In Experiment 1, participants were asked to adjust the...
conference paper 2014
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Li, J. (author), Erkin, Z. (author), De Ridder, H. (author), Vermeeren, A.P.O.S. (author)
Crowd experience is inevitable in daily life. Crowd managers need tools to accurately estimate the psychological aspects of crowds, an important one being crowd emotion. In this study, we explore the feasibility of obtaining a real-time, dynamic map of crowd emotions through self-reporting by crowd members. To this end, a smart phone application...
conference paper 2013
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Jansen, R.J. (author), Van Egmond, R. (author), De Ridder, H. (author), Silvester, S. (author)
Operational police work can be characterized by the continuous switching between surveillance, responding to incidents, and office activities. Transitions between these activities are initiated by radio contact, messages on a mobile data terminal, or personal observations. The “information environment” emerging from these channels may cause...
conference paper 2013
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Demirel, H.C. (author), De Ridder, H.A.J. (author)
Technological advances, financial possibilities and changes of demands have increasingly affected the pavement maintenance environment for outsourcing in recent years. This induces complexity in the contracting methods of pavement maintenance activities. Despite the fact that current contracting practices on pavement maintenance activities are...
conference paper 2013
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Li, J. (author), De Ridder, H. (author), Vermeeren, A.P.O.S. (author), Conrado, C. (author), Martella, C. (author)
This paper investigates the needs or criteria for sustaining well-being in crowded situations through two focus group discussions with a total of ten participants. We conclude that pursuing crowd well-being could be divided into two different cases: one is obtaining the enhancement of the current state in normal situations, and the other is...
conference paper 2013
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Grobbe, N. (author), Schoemaker, F.C. (author), Schakel, M.D. (author), De Ridder, S.A.L. (author), Slob, E.C. (author), Smeulders, D.M.J. (author)
conference paper 2012
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De Ridder, H. (author), Pont, S.C. (author)
In the past decades perceptual (or perceived) image quality has been one of the most important criteria for evaluating digitally processed image and video content. With the growing popularity of new media like stereoscopic displays there is a tendency to replace image quality with viewing experience as the ultimate criterion. Adopting such a...
conference paper 2012
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Van Ledden, M. (author), Lansen, A.J. (author), De Ridder, H.A.J. (author), Edge, B. (author)
This paper reports a reconnaissance level study of a storm surge barrier in the Mississippi River. Historical hurricanes have shown storm surge of several meters along the Mississippi River levees up to and upstream of New Orleans. Future changes due to sea level rise and subsidence will further increase the risk of flooding due to hurricane...
conference paper 2012
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Winterbach, W. (author), De Ridder, D. (author), Wang, H.J. (author), Reinders, M. (author), Van Mieghem, P. (author)
conference paper 2012
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Van Doorn, A.J. (author), Wagemans, J. (author), De Ridder, H. (author), Koenderink, J.J. (author)
A "picture" is a at object covered with pigments in a certain pattern. Human observers, when looking "into" a picture (photograph, painting, drawing, . . . say) often report to experience a three dimensional "pictorial space." This space is a mental entity, apparently triggered by so called pictorial cues. The latter are sub-structures of color...
conference paper 2011
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Van Nederveen, G.A. (author), Soons, F.A.M. (author), Suddle, S.I. (author), De Ridder, H. (author)
In faculties such as Civil Engineering, design is a not a core activity. Core activities at Civil Engineering are structural engineering, structural analysis, mechanics, fluid dynamics, etc. Design education has a relatively small share in the curriculum, compared to faculties such as Industrial Design or Architecture. Against this background,...
conference paper 2011
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De Ridder, H. (author)
The construction industry is not sustainable. Expressed in percentages of the totals in the Netherlands and when calculated over the total lifecycle, from the early start to the processing of waste after demolition, energy consumption is more than 50%, CO2 emission is more than 50%, waste production is 35 %, road transport is 25 %, failure costs...
conference paper 2011
document
De Ridder, H. (author)
The construction industry is not sustainable. Expressed in percentages of the totals in the Netherlands and when calculated over the total lifecycle, from the early start to the processing of waste after demolition, energy consumption is more than 50%, CO2 emission is more than 50%, waste production is 35 %, road transport is 25 %, failure costs...
conference paper 2011
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Meijer, F. (author), Van den Broek, E.L. (author), Schouten, T.E. (author), Damgrave, R.G.J. (author), De Ridder, H. (author)
In this paper, we explored the use of low fidelity Synthetic Environments (SE; i.e., a combination of simulation techniques) for product design. We explored the usefulness of low fidelity SE to make design problems explicit. In particular, we were interested in the influence of interactivity on user experience. For this purpose, an industrial...
conference paper 2010
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Winterbach, W. (author), Wang, H. (author), Reinders, M. (author), Van Mieghem, P. (author), De Ridder, D. (author)
conference paper 2010
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Winterbach, W. (author), Wang, H. (author), Reinders, M. (author), Van Mieghem, P. (author), De Ridder, D. (author)
Biological networks exhibit intriguing topological properties such as small-worldness. In this paper, we investigate whether the topology of a metabolic network is related to its robustness. We do so by perturbing a metabolic system in silico, one reaction at a time and studying the correlations between growth, as predicted by flux balance...
conference paper 2010
document
Verlaan, J.G. (author), De Ridder, H.A.J. (author)
For two years now, Rijkswaterstaat, an agency of the Dutch Ministry of Transport, Public Works and Water Management, is required to have a financial administration, which is based on accrual accounting principles. This involves the use of a balance sheet and the equivalent of a profit and loss statement. These documents will the basis for...
conference paper 2010
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