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 conduc...
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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
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 sys...
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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
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 go...
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.
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...
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 t...
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.
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 so...
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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...
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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.
We propose a specification language ProML for protein sequences, structures, and families based on the open XML standard. The language allows for portable, system-independent, machine-parsable and human-readable repre...
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We propose a specification language ProML for protein sequences, structures, and families based on the open XML standard. The language allows for portable, system-independent, machine-parsable and human-readable representation of essential features of proteins. The language is of immediate use for several bioinformatics applications: we discuss clustering of proteins into families and the representation of the specific shared features of the respective clusters. Moreover, we use ProML for specification of data used in fold recognition bench-marks exploiting experimentally derived distance constraints.
Extreme high demands on designing accurate prototypes for example in the fields of medical research, aircraft construction, shipbuilding and automotive industry require multidisciplinary simulations. A large number of...
Extreme high demands on designing accurate prototypes for example in the fields of medical research, aircraft construction, shipbuilding and automotive industry require multidisciplinary simulations. A large number of tools for monodisciplinary simulations are available today. Each of these provides high quality simulation results in a specific physical domain. Now there is also a solution to do multidisciplinary computations: Parallel monodisciplinary codes are coupled with the Mesh based parallel Code Coupling Interface MpCCI to solve multidisciplinary problems with a loose coupled approach. The paper presents applications in the framework of fluid-structure interaction, which demonstrate the advantages of the parallel coupling library for this kind of problems. The computational fluid dynamics code FLOWer developed at the institute of Design Aerodynamics/DLR and the structural mechanics code SIMPACK developed at the institute of Aeroelasticity/DLR are coupled to solve an aeroelastic test problem. The applicability of the coupling library in the field of aeroelasticity is strongly dependent on the integrated interpolations between the involved meshes. In the institute of Aeroelasticity the aeroelastic analysis tool CAESAR was developed which includes aeroelasticity specific interpolation algorithms. These routines are integrated in MpCCI via a special interface. There are two types of interpolation routines included. The first kind of algorithms is based on the method of finite interpolation elements and the second uses radial basis functions.
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