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International Zurich Symposium on Electromagnetic Compatibility (EMC Zurich)

作者： M.L. Zitzmann T. Clees R. Weigel Institute for Electronics Engineering University of Erlangen Nuremberg Erlangen Germany Algorithms and Scientific Computing Fraunhofer Institute Germany

This paper presents the application of iterative solution techniques to large sparse equation systems derived from PEEC modeling. The PEEC method (partial element equivalent circuit) is an approach to transform conducting objects into linear networks with basic electrical elements. Such equivalent circuit models can be simulated by conventional circuit solvers such as SPICE (simulation program for integrated circuit emphasis) based on the MNA (modified nodal analysis) approach. By applying appropriate sparsification techniques sparse system matrices can be obtained, adequate for iterative solvers. By using multilevel approaches linear complexity in time and memory requirements can be achieved in the best case. The suitability of different iterative methods as applied to such systems is compared by means of examples

关键词： Iterative methods Sparse matrices Circuit simulation Integrated circuit modeling Analytical models Iterative algorithms Equivalent circuits Transforms Integral equations Inductance

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Hybrid solver strategies in automotive EMC simulation

Hybrid solver strategies in automotive EMC simulation

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International Zurich Symposium on Electromagnetic Compatibility (EMC Zurich)

作者： M.L. Zitzmann R. Grillmair T. Clees R. Weigel Institute for Electronics Engineering University of Erlangen Nuremberg Erlangen Germany University of Applied Sciences Munich Germany Fraunhofer Institute for Algorithms and Scientific Computing Sankt Augustin Germany

Switching operations in integrated circuits are often the reason for electromagnetic disturbances which can spread over the whole system. This is especially important for automotive applications where many control systems are connected together via cable harnesses. Although model order reduction techniques help to reduce the computational effort resulting from realistic automotive simulation problems suitable solver strategies are indispensable. Their efficiency highly depends on the matrix properties which are directly affected by the kind of modeling and simulation approach. In this paper it is shown that hybrid solver strategies are most advantageous for flexible EM simulation. Analysis of the matrix properties helps to identify the most appropriate solver

关键词： Automotive engineering Electromagnetic compatibility Circuit simulation Transmission line matrix methods Computational modeling Sparse matrices Power cables Equations Integrated circuit noise Manufacturing

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Grid Added Value to Address Malaria 06

Grid Added Value to Address Malaria

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Proceedings of the Sixth IEEE International Symposium on Cluster computing and the Grid

作者： V. Breton N. Jacq M. Hofmann Université Blaise Pascal/IN2P3 France Communication & Systèmes CS-SI France Fraunhofer Institute for Algorithms and Scientific Computing (SCAI) Germany

ISBN: (纸本)9780769525853

Through this paper, we call for a distributed, internet-based collaboration to address one of the worst plagues of our present world, malaria. The spirit is a non-proprietary peer-production of informationembedding goods. And we propose to use the grid technology to enable such a world wide "open source" like collaboration. The first step towards this vision has been achieved during the summer on the EGEE grid infrastructure where 46 million ligands were docked for a total amount of 80 CPU years in 6 weeks in the quest for new drugs.

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Information extraction technologies for the life science industry

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Drug Discovery Today: Technologies 2005年第3期2卷 217-224页

作者： Fluck, Juliane Zimmermann, Marc Kurapkat, Günther Hofmann, Martin Fraunhofer-Institute for Algorithms and Scientific Computing 53754 Sankt Augustin Germany TEMIS Deutschland GmbH 69115 Heidelberg Kurfürstenanlage 3 Germany

Access to relevant information and knowledge is essential for all steps of the drug discovery process. However, keeping track of relevant information in publications and patents becomes a real challenge for scientists and managers in industrial research. Computer-aided information extraction (IE) systems have been developed to support the work of scientists by extracting relevant information from scientific publications and presenting it in an aggregated, condensed form. In this review, we will give an overview on current information extraction strategies in the life sciences with a special focus on biological entity recognition and more recent developments towards the identification and extraction of chemical compound names and structures. © 2005 Elsevier Ltd. All rights reserved.

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A tightly coupled particle-fluid model for DNA-laden flows in complex microscale geometries

A tightly coupled particle-fluid model for DNA-laden flows i...

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3rd M.I.T. Conference on Computational Fluid and Solid Mechanics

作者： Trebotich, D. Miller, G.H. Colellac, P. Graves, D.T. Martin, D.F. Schwartz, P.O. Lawrence Livermore National Laboratory Center for Applied Scientific Computing PO Box 808 L-560 Livermore CA 94551 United States Department of Applied Science University of California One Shields Avenue Davis CA 95616 United States Applied Numerical Algorithms Group Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 United States

ISBN: (纸本)0080444814

We present a stable and convergent method for the computation of flows of DNA-laden fluids in microchannels with complex geometry. The numerical strategy combines a ball-rod model representation for polymers coupled tightly with a projection method for incompressible viscous flow. We use Cartesian grid embedded boundary methods to discretize the fluid equations in the presence of complex domain boundaries. A sample calculation is presented showing flow through a packed array microchannel in two dimensions. © 2005 Elsevier Ltd.

关键词： Microfluidics

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Cell-centred multigrid revisited

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computing and Visualization in Science 2004年第3期7卷 129-140页

作者： Marcus Mohr Roman Wienands Friedrich-Alexander-University of Erlangen-Nuremberg Erlangen Germany Fraunhofer Institute for Algorithms and Scientific Computing (SCAI) Sankt Augustin Germany

In this paper we treat the cell-centred multigrid approach, which distinguishes itself from the classical vertex-centred multigrid by a non-nested hierarchy of grid nodes and the use of constant, problem-independent transfer operators even in complicated situations. We demonstrate, that the tool of Local Fourier Analysis can also be profitably applied in this setting. We consider in detail the standard transfer operators from literature and their respective polynomial and Fourier orders, paying special attention to the combination of piecewise constant interpolation and its adjoint. Furthermore, we give several numerical examples for model problems and an application from biomedical engineering.

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Vessel segmentation and blood flow simulation using Level-Sets and Embedded Boundary methods

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International Congress Series 2004年第C期1268卷 75-80页

作者： Deschamps, T. Schwartz, P. Trebotich, D. Colella, P. Saloner, D. Malladi, R. Mathematics Department Lawrence Berkeley National Laboratory Berkeley CA 94720 MS50A-1148 Mathematics 1 Cyclotron Road United States Applied Numerical Algorithms Group Lawrence Berkeley National Laboratory United States Center for Applied Scientific Computing Lawrence Livermore National Laboratory United States Vascular Imaging Research Center University of California San Francisco CA United States

In this article we address the problem of blood flow simulation in realistic vascular objects. The anatomical surfaces are extracted by means of Level-Sets methods that accurately model the complex and varying surfaces of pathological objects such as aneurysms and stenoses. The surfaces obtained are defined at the sub-pixel level where they intersect the Cartesian grid of the image domain. It is therefore straightforward to construct embedded boundary representations of these objects on the same grid, for which recent work has enabled discretization of the Navier–Stokes equations for incompressible fluids. While most classical techniques require construction of a structured mesh that approximates the surface in order to extrapolate a 3D finite-element gridding of the whole volume, our method directly simulates the blood flow inside the extracted surface without losing any complicated details and without building additional grids. © 2004 CARS and Elsevier B.V.

关键词： Blood-flow Embedded Boundary methods Fast-Marching Level-Sets Navier–Stokes equations Segmentation

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Air-flow simulation in realistic models of the trachea

Air-flow simulation in realistic models of the trachea

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： T. Deschamps R. Schwartz D. Trebotich Mathematics Department Lawrence Berkeley National Laboratory USA Applied Numerical Algorithms Group Lawrence Berkeley National Laboratory USA Center for Applied Scientific Computing Lawrence Livemore National Laboratory USA

In this article we present preliminary results from a new technique for flow simulation in realistic anatomical airways. The airways are extracted by means of Level-Sets methods that accurately model the complex and varying surfaces of anatomical objects. The surfaces obtained are defined at the sub-pixel level where they intersect the Cartesian grid of the image domain. It is therefore straightforward to construct embedded boundary representations of these objects on the same grid, for which recent work has enabled discretization of the Navier-Stokes equations for incompressible fluids. While most classical techniques require construction of a structured mesh that approximates the surface in order to extrapolate a 3D finite-element griding of the whole volume, our method directly simulates the air-flow inside the extracted surface without losing any complicated details and without building additional grids.

关键词： Computational fluid dynamics Computational modeling Data mining Laboratories Image processing Computed tomography Shape measurement Computational geometry Tracking Equations

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AUTOBENCH/AUTO-OPT: Towards an integrated construction environment for virtual prototyping in the automotive industry

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2840卷 686-690页

作者： Kuhlmann, A. Thole, C.-A. Trottenberg, U. Fraunhofer Institute for Algorithms and Scientific Computing Schloss Birlinghoven 53754 Sankt Augustin Germany

The present paper describes two cooperative projects (AUTOBENCH and AUTO-OPT) carried out with partners in the automotive industries (AUDI, BMW, DaimlerChrysler, Karmann and Porsche), software vendors of simulation software (ESI, INTES, INPRO, SFE) and technology providers (Uni Stuttgart, FhG-SCAI and DLR-SISTEC). Both projects aim at the development of integrated working environments for virtual automotive prototypes. Special focus is on simulation of functional behaviour of the car body, production of its parts and their improvement. New technologies have been developed for the handling of numerical grids, integration of CAE tools, numerical algorithms and visualisation. Parallel computing is supported throughout the projects on a simulation level as well as for optimisation purposes. Ongoing work concentrates on the interactive simulation and optimisation as well as the reuse of the vast amount of resulting data. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Automotive industry

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Multipartite entangled states in coupled quantum dots and cavity QED

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Physical Review A 2003年第2期67卷 022302-022302页

作者： Xiaoguang Wang Mang Feng Barry C. Sanders Department of Physics and Centre for Advanced Computing—Algorithms and Cryptography Macquarie University Sydney New South Wales 2109 Australia Institute for Scientific Interchange (ISI) Foundation Viale Settimio Severo 65 I-10133 Torino Italy

We investigate the generation of multipartite entangled state in a system of N quantum dots embedded in a microcavity and examine the emergence of genuine multipartite entanglement by three different characterizations of entanglement. At certain times of dynamical evolution one can generate multipartite entangled coherent exciton states or multiqubit W states by initially preparing the cavity field in a superposition of coherent states or the Fock state with one photon, respectively. Finally, we study environmental effects on multipartite entanglement generation and find that the decay rate for the entanglement is proportional to the number of excitons.

关键词： Quantum cryptography

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