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Computing electromagnetic fields in inhomogeneous media using lattice gas automata 12

Computing electromagnetic fields in inhomogeneous media usin...

12th international Symposium on Antenna Technology and applied Electromagnetics and Canadian Radio Sciences conference, Antem/URSI 2006

作者： Zhang, M. Cule, D. Shafai, L. Bridges, G. Simons, N. Department of Electrical and Computer Engineering University of Manitoba WinnipegR3T 5V6 Canada VPRS Communications Research Centre OttawaK2H 8S2 Canada Antennas and Integrated Electronics Communications Research Centre OttawaK2H 8S2 Canada

ISBN: (纸本)9780973842517

Lattice Gas Automata (LGA) can be considered as an alternative to the conventional differential equation description of problems in electromagnetics. LGAs are discrete dynamical systems that are based on a microscopic model of the physics being simulated. the basic constituents of an LGA are discrete cells. these cells are interconnected according to certain symmetric requirements to form an extremely large regular lattice. the cells of an LGA are extremely simple, requiring only a few bits to completely describe their states. Even through they are simple however, the collective behaviour of LGA microscopic systems are capable of exhibiting those behaviours described by partial differential equations for real physical systems. One type of simple LGA, the HPP LGA, is constructed with only a few bits per cell and operated on a rectangular lattice. We have demonstrated [1] that it is capable of simulating two dimensional electromagnetic fields. Furthermore, the inherent parallelism and simplicity of LGA algorithms make them ideally suited to implementation in a parallel processing architecture. © 2006 ANTEMURSI.

关键词： Cells

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A new insight to the matrices extraction in a MOESP type subspace identification algorithm

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international JOURNAL OF SYSTEMS SCIENCE 2006年第8期37卷 565-574页

作者： Delgado, Catarina J. M. Dos Santos, P. Lopes Martins De Carvalho, J. L. Univ Porto Fac Econ ISR Porto P-4200464 Oporto Portugal Univ Porto Fac Engn ISR Porto P-4200465 Oporto Portugal

In this paper we analyse the estimates of the matrices produced by the non-biased deterministic-stochastic subspace identification algorithms (NBDSSI) proposed by Van Overschee and De Moor ( 1996). First, an alternate expression is derived for the A and C estimates. It is shown that the Chiuso and Picci result ( Chiuso and Picci 2004) stating that the A and C estimates delivered by this algorithm robust version and by the Verhaegen's MOESP (Verhaegen and Dewilde 1992a, Verhaegen and Dewilde 1992b, Verhaegen 1993, Verhaegen 1994) are equal, can be obtained from this expression. An alternative approach for the estimation of matrices B and D in subspace identification is also described. It is shown that the least squares approach for the estimation of these matrices estimation can be just expressed as an orthogonal projection of the future outputs on a lower dimension subspace in the orthogonal complement of the column space of the extended observability matrix. Since this subspace has a dimension equal to the number of outputs, a simpler and numerically more efficient ( but equally accurate) new subspace algorithm is provided.

关键词： subspace identification methods parameter estimation state-space models discrete-time linear systems

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A new insight to the matrices extraction in a MOESP type subspace identification algorithm

A new insight to the matrices extraction in a MOESP type sub...

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6th Portuguese conference on Automatic Control

作者： Delgado, Catarina J. M. Dos Santos, P. Lopes Martins De Carvalho, J. L. Univ Porto Fac Econ ISR Porto P-4200464 Oporto Portugal Univ Porto Fac Engn ISR Porto P-4200465 Oporto Portugal

关键词： subspace identification methods parameter estimation state-space models discrete-time linear systems

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Partial Sum Based Algorithm for the discrete Cosine Transform

Partial Sum Based Algorithm for the Discrete Cosine Transfor...

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international conference on ITS Telecommunications (ITST)

作者： Mao Tian Guang-jun Li Qi-zong Peng University of Electronic Science and Technology China

In this paper, a fast algorithm and its corresponding hardware structure are developed for the 2 M times2 M type discrete cosine transform. the transform output is transformed into a mul-add format by the definition of the 2-D DCT/IDCT. the output data set is partitioned into several subsets each having the same multiplicands that we call partial sum. By computing partial sum, the addition and multiplication operation times can be greatly reduced. In final, its corresponding hardware architecture is presented for VLSI implementation. the synthesis result shows that the algorithm is efficient and reliable

关键词： discrete cosine transforms Hardware Partitioning algorithms Very large scale integration Costs throughput discrete transforms Computer architecture Field programmable gate arrays

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Design & Implementation of the Civil Digital Walkie-talkie Signaling System by SDL

Design & Implementation of the Civil Digital Walkie-talkie S...

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international conference on ITS Telecommunications (ITST)

作者： Qiu Jigang Lin Xiaokang Department of Electronic Engineering Tsinghua University Beijing China

Because the communication mechanism and the applied filed of the civil digital walkie-talkie (DWT) are different to the traditional walkie-talkie, the signaling technology of the traditional walkie-talkie can't be applied to the civil DWT. So the signaling technology of civil DWT must be designed renewedly. this paper analyzes the call loss ratio and delay of the civil DWT, and brings forward a signaling structure (N+1). In addition, this paper introduces the signaling technology of implementing single call service, group call service, broadcast service and short message service especially. And then how to use the SDL tools to implement the signaling technology is addressed in detail. At last, this paper introduces the process of using VC and SDL language to build a test bench to validate the proposed signaling protocol

关键词： Signal design Communication system signaling discrete wavelet transforms Signal analysis Delay Broadcast technology Broadcasting Message service Virtual colonoscopy Testing

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Abstracts from the 6th international conference on the Engineering of Sport, 10-14 July 2006, Olympic Hall, Munich, Germany Abstracts

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SPORTS ENGINEERING 2006年第3期9卷 175-190页

作者： [Anonymous] University of Exeter UK Cranfield University UK University of Ulster UK R&A Rules Limited UK Instituto de Biomecánica de Valencia (IBV) Spain Movement Sciences Group Department of Health Sciences Universiteit Maastricht Netherlands Terra Sports Technology Canada Otto-von-Guericke-University Magdeburg Germany Sports Technology Research Group Loughborough University UK University of Stuttgart Germany Loughborough University UK Sports Engineering CSES Sheffield Hallam University UK Department of Anatomy Bristol University Bristol UK Department of Mechanical Engineering Bristol University Bristol UK Engineering Mechanics United States Air Force Academy Colorado Springs USA Wright Patterson Air Force Base Ohio USA Department Product Development TU Munich Germany Department of Sport Science Otto-von-Guericke University Magdeburg Germany Department of Sport Science University of Vienna Austria Department of Mechanical Engineering Bristol University UK University of Cambridge UK University of Glamorgan UK TUM Sport Equipment & Materials Germany Sports Engineering Research Group University of Sheffield UK Audi Sport USA Royal Melbourne Institute of Technology Australia University of Bath UK University of Wales Institute Cardiff UK Graduate School of Information Science & Engineering Tokyo Institute of Technology Japan Cranfield Centre for Sports Surfaces Cranfield University UK Institute of Mechatronics Chemnitz Germany Institute for Applied Training Science Leipzig Germany Swedish Defence Research Agency Sweden Department of Sport Science University of Innsbruck Austria Department of Engineering Mathematics Geometry & Computer Science University of Innsbruck Austria Department of Mechanics & Mechatronics Vienna University of Technology Austria HTM Tyrolia Schwechat Austria College of Engineering Chubu University Japan Graduate Student of Engineering Chubu University Japan Department of Mechanical Engineering Chubu University Japan The University of We

the primary aim of this study was to assess the feasibility of using a soil laboratory designed for testing of industrial equipment, for the biomechanical assessment of sports movements and footwear. this was achieved by the investigation of the influence of three different footwear types on in-shoe pressures to assess cushioning provided by the footwear for two surface conditions of differing density. Six subjects each performed running trials on the two surfaces in three pairs of footwear: molded boots, boots with studs and trainers. Inshoe pressure data were collected for six running steps for each shoe-surface condition, with peak heel force values used to quantify cushioning. Within each surface condition, similar peak heel force values were obtained for each of the footwear conditions. the comparison of surfaces revealed significantly higher heel impact forces when running on the higher density surface, suggesting a lower cushioning effect of this surface condition. this study demonstrates the potential of the described novel methodology to investigate footwear-surface combinations for controlled natural soil conditions. Combining these data with simultaneously measured pressures at different soil depths will allow the development of surface designs to best cope with the forces applied by the human.

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Quaternary Reed-Muller codes

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IEEE TRANSACTIONS ON INFORMATION thEORY 2005年第7期51卷 2686-2691页

作者： Borges, J Fernández, C Phelps, KT Autonomous Univ Barcelona Dept Comp Sci E-08193 Barcelona Spain Auburn Univ Dept Discrete & Stat Sci Auburn AL 36849 USA

the class of quaternary Reed-Muller codes is introduced as a generalization of Reed-Muller codes to Z(4)-linear codes. Properties of this class of codes are established including the rank and kernel of the Gray map im... 详细信息

关键词： kernel quaternary codes quaternary Reed-Muller (QRM) rank Reed-Muller

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algorithms for polyominoes based on the discrete Green theorem

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discrete applied mathematics 2005年第2-3期147卷 187-205页

作者： Brlek, S Labelle, G Lacasse, A Univ Quebec LaCIM Montreal PQ H3C 3P8 Canada

the use of Green's theorem and bivariate difference calculus provides a general and unifying framework for the description and generation of incremental algorithms. the method is applied in order to provide algorithms computing various statistics about polyominoes coded by 4-letter words describing their contour. these statistics include area, coordinates of the center of gravity, moment of inertia, size of projections, hook lengths, number of pixels in common with a given set of pixels, in particular the intersection of two polyominoes and also q-statistics for projections. (c) 2004 Elsevier B.V. All rights reserved.

关键词： discrete Green theorem algorithms statistics about polyominoes

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algorithms for polyominoes based on the discrete Green theorem

Algorithms for polyominoes based on the discrete Green theor...

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11th international conference on discrete Geometry for Computer Imagery

作者： Brlek, S Labelle, G Lacasse, A Univ Quebec LaCIM Montreal PQ H3C 3P8 Canada

关键词： discrete Green theorem algorithms statistics about polyominoes

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Invertible smoothing preconditioners for linear discrete ill-posed problems

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applied NUMERICAL mathematics 2005年第2期54卷 135-149页

作者： Calvetti, D Reichel, L Shuibi, A Kent State Univ Dept Math Sci Kent OH 44242 USA Case Western Reserve Univ Dept Math Cleveland OH 44106 USA De Paul Univ Dept Math Sci Chicago IL 60614 USA

the solution of large linear discrete ill-posed problems by iterative methods has recently received considerable attention. this paper presents invertible smoothing preconditioners which are well suited for use with t... 详细信息

关键词： ill-posed problem iterative method GMRES RRGMRES LSQR preconditioning

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