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Huibregtse, O.L. (author), Hoogendoorn, S.P. (author), Pel, A.J. (author), Bliemer, M.C.J. (author)A method is described to develop a set of optimal instructions to evacuate by car the population of a region threatened by a hazard. By giving these instructions to the evacuees, traffic conditions and therefore the evacuation efficiency can be optimized. The instructions, containing a departure time, a destination, and a route, are created...conference paper 2010
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Zuurbier, F.S. (author), Hegyi, A. (author), Hoogendoorn, S.P. (author)Marginal costs in traffic networks are the extra costs incurred to the system as the result of extra traffic. Marginal costs are required frequently e.g. when considering system optimal traffic assignment or tolling problems. When explicitly considering spillback in a traffic flow model, one can use a numerical derivative or resort to heuristics...conference paper 2010
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Urbach, H.P. (author), Pereira, S.F. (author), Broer, D.J. (author)We determine field distributions in the pupil of a high NA lens, that give, for a given power incident on the lens, the maximum electric field amplitude in focus in a specific direction. We consider in particular the cases of maximum longitudinal and maximum transverse components. The distribution of the maximum longitudinal component in the...conference paper 2009
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Van den Hof, P.M.J. (author), Jansen, J.D. (author), Van Essen, G.M. (author), Bosgra, O.H. (author)Due to urgent needs to increase efficiency in oil recovery from subsurface reservoirs new technology is developed that allows more detailed sensing and actuation of multiphase flow properties in oil reservoirs. One of the examples is the controlled injection of water through injection wells with the purpose to displace the oil in an appropriate...conference paper 2009
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Arnold, M. (author), Negenborn, R.R. (author), Andersson, G. (author), De Schutter, B. (author)The optimal operation of an integrated electricity and natural gas infrastructure is investigated. The couplings between the electricity system and the gas system are modeled by so-called energy hubs, which represent the interface between the loads on the one hand and the transmission infrastructures on the other. To increase reliability and...conference paper 2009
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Snellen, M. (author), Siemes, K. (author), Simons, D.G. (author)Nowadays extensive use is made of multibeam echosounders (MBES) for mapping the bathymetry of sea- and river-floors. The MBES is capable of covering large areas in limited time by emitting an acoustic pulse along a wide swathe perpendicular to the sailing direction. The angle and the corresponding two-way travel-time of the received signals are...conference paper 2009
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Simons, D.G. (author), Snellen, M. (author), Siemes, K. (author)Seafloor characterization is important in many fields including hydrography, marine geology, coastal engineering and habitat mapping. The advantage of non-invasive acoustic methods for sediment characterization over conventional bottom grabbing is the nearly continuous versus sparse sensing and the enormous reduction in survey time and costs....conference paper 2009
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- Wang, H. (author), Van Mieghem, P. (author) conference paper 2008
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- Karimi Nejadasl, F. (author), Gorte, B.G.H. (author), Hoogendoorn, S.P. (author), Snellen, M. (author) conference paper 2008
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Van Turnhout, M. (author), Bociort, F. (author)Local optimization algorithms, when they are optimized only for speed, have in certain situations an unpredictable behavior: starting points very close to each other lead after optimization to different minima. In these cases, the sets of points, which, when chosen as starting points for local optimization, lead to the same minimum (the so...conference paper 2007
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Bociort, F. (author), Van Turnhout, M. (author), Marinescu, O. (author)Saddle-point construction (SPC) is a new method to insert lenses into an existing design. With SPC, by inserting and extracting lenses new system shapes can be obtained very rapidly, and we believe that, if added to the optical designer’s arsenal, this new tool can significantly increase design productivity in certain situations. Despite the...conference paper 2007
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- Kumar, P. (author), Bauer, P. (author) conference paper 2007
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Daumas, L. (author), Dinh, Q.V. (author), Kleinveld, S. (author), Rogé, G. (author)Preliminary results on shape optimization of a wing-body configuration aiming at reducing sonic boom overpressure will be discussed. The optimization process uses a CAD modeler and an Euler CFD code with adjoint. Thickness, scale, twist and camber at section level were used to obtain gains in ground pressure signature.conference paper 2006
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Papadimitriou, D.I. (author), Giannakoglou, K.C. (author)This paper summarizes progress, recently made in the Lab. of Thermal Turbomachines of NTUA, on the formulation and use of the continuous adjoint methods in aerodynamic shape optimization problems. The basic features of state of the art adjoint methods and tools which are capable of handling arbitrary objective functions, cast in the form of...conference paper 2006
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- Pironneau, O. (author) conference paper 2006
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- Homsi, P. (author) conference paper 2006
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Mirzaei, M. (author), Roshanian, J. (author), Nasrin Hosseini, S. (author)A gradient based method is presented for optimization of an airfoil configuration. The flow is governed by two dimensional, compressible Euler equations. A finite volume code based on unstructured grid is developed to solve the equations. The procedure is carried out for optimizing an airfoil with initial configuration of NACA 0012. The...conference paper 2006
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Bletzinger, K.U. (author), Gallinger, T. (author), Kupzok, A. (author), Wüchner, R. (author)In this paper the possibility of the optimization of coupled problems in partitioned approaches is discussed. As a special focus, surface coupled problems of fluid-structure interaction are considered. Well established methods of optimization are analyzed for usage in the context of coupled problems and in particular for a solution through...conference paper 2006
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Wild, J. (author), Brezillon, J. (author), Mertins, R. (author), Quagliarella, D. (author), Germain, E. (author), Amoignon, O. (author), Moens, F. (author)The design activity within the EUROLIFT II project is targeted towards an improvement of the take-off performance of a generic transport aircraft configuration by a re-design of the trailing edge flap. The involved partners applied different optimization strategies as well as different types of flow solvers in order to cover a wide range of...conference paper 2006
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Bociort, F. (author), Van Turnhout, M. (author)In present-day optical system design, it is tacitly assumed that local minima are points in the merit function landscapewithout relationships between them. We will show however that there is a certain degree of order in the design landscapeand that this order is best observed when we change the dimensionality of the optimization problem and when...conference paper 2006