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Scharpff, J. (author), Spaan, M.T.J. (author), Volker, L. (author), De Weerdt, M.M. (author)We address efficient planning of maintenance activities in infrastructural networks, inspired by the real-world problem of servicing a highway network. A road authority is responsible for the quality, throughput and maintenance costs of the network, while the actual maintenance is performed by autonomous, third-party contractors. From a (multi...conference paper 2013
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- Scharpff, J. (author), Spaan, T.J. (author), Volker, L. (author), De Weerdt, M. (author) conference paper 2013
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Oliehoek, F.A. (author), Spaan, M.T.J. (author), Amato, C. (author), Whiteson, S. (author)This article presents the state-of-the-art in optimal solution methods for decentralized partially observable Markov decision processes (Dec-POMDPs), which are general models for collaborative multiagent planning under uncertainty. Building off the generalized multiagent A* (GMAA*) algorithm, which reduces the problem to a tree of one-shot...journal article 2013
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Scharpff, J.C.D. (author), Spaan, M.T.J. (author), De Weerdt, M.M. (author)We study the planning of maintenance activities on public infrastructural networks – road networks, Internet, power grids, etc. – in contingent environments such that the negative impact on the network user is minimised. Traditional efforts hereto are mainly of a regulatory nature, whereas we propose charging the service-providers (agents)...conference paper 2012
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Spaan, M.T.J. (author), Oliehoek, F.A. (author)Multiagent Partially Observable Markov Decision Processes (MPOMDPs) provide a powerful framework for optimal decision making under the assumption of instantaneous communication. We focus on a delayed communication setting (MPOMDP-DC), in which broadcasted information is delayed by at most one time step. In this paper, we show that computation of...conference paper 2012
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Spaan, M.T.J. (author), Oliehoek, F.A. (author), Amato, C. (author)We advance the state of the art in optimal solving of decentralized partially observable Markov decision processes (Dec-POMDPs), which provide a formal model for multiagent planning under uncertainty.conference paper 2011
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Van den Wijngaard, J.P.H.M. (author), Kolyva, C. (author), Siebes, M. (author), Dankelman, J. (author), Van Gemert, M.J.C. (author), Piek, J.J. (author), Spaan, J.A.E. (author)The subendocardium is most vulnerable to ischemia, which is ameliorated by relaxation during diastole and increased coronary pressure. Recent clinical techniques permit the measuring of subendocardial perfusion and it is therefore important to gain insight into how measurements depend on perfusion conditions of the heart. Using data from...journal article 2008
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- Verboomen, J. (author), Schavemaker, P.H. (author), Kling, W.L. (author), van Hertem, D. (author), Spaan, F.J.C.M. (author), Delince, J.M. (author) journal article 2007
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- Dankelman, J. (author), Cornelissen, A.J.M. (author), Lagro, J. (author), VanBavel, E. (author), Spaan, J.A.E. (author) journal article 2007
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- Spaan, F.H.P. (author) doctoral thesis 2000
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- Haaren, Y.H.G. van (author), Spaan, G.B.H. (author) report 1998
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- Haaren, Y.H.G. van (author), Spaan, G.B.H. (author) report 1997
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- Spaan, G.B.H. (author) report 1997
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- Spaan, G.B.H. (author), Vledder, G.P. van (author), Hurdle, D.P. (author) report 1996
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Spaan, F.H.P. (author), Kramer, A.J. (author)The schlleren observation technic[ue can be used in microgravity experiments. Alignment features for the gratings of a multiple source sharp focusing schlieren system have been analysed. Measurements have been performed to verify the theoretical predictions which show good agreement with the analysis results. The analysis allows for the...report 1993
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- Spaan, F.H.P. (author) report 1992
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Spaan, F.H.P. (author), Kramer, A.J. (author)At NLR a multiple source schlieren observation system has been developed as part of the Tele-operated Prototype Optical Diagnostic Instrument (TelePODI). A technique for the tele-operated alignment of the gratings of the schlieren system is described. Future requirements for teleoperation/automation motivated a detailed analysis as a case study....report 1992
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Spaan, F.H.P. (author)A study has been carried out to define a first concept of the Analysis Facility of the Bioscreening with Robotics facility (BioRob). The feasibility has been investigated of incorporating spectral analysis, inspection microscopy or both. Intensity and scatter measurement have also been assessed briefly. The fluid samples for analysis are...report 1992
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Pinches, C.L. (author), Kuijpers, E.A. (author), Spaan, F. (author)Microgravity experiments operated using telescience concepts face certain constraints. The effect of these constraints on the focusing task are identified. Four types of focusing strategy, which provide a natural means of focusing in the presence of these constraints, are described. Three specific strategies are implemented as part of the...report 1991
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van den Assem, D. (author), Spaan, F. (author), Vreeburg, J. (author), Falk, F. (author), Heide, W. (author), Langbein, D. (author)This executive summary reports the results of the conceptual study of a mini fluid science laboratory (MFSL). The MFSL is designed to provide effective microgravity on earth and so allows substantiation of the viability of fluid physics experiments in space-based laboratories. Detailed results have been reported in parts I through III of NLR CR...report 1990