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作者： Matsuoka, Satoshi Shimojo, Sinji Aoyagi, Mutsumi Sekiguchi, Satoshi Usami, Hitohide Miura, Kenichi Global Scientific Information and Computing Center Tokyo Institute of Technology Tokyo 152-8550 Japan NAREGI Project National Institute of Informatics Tokyo 101-0051 Japan Cybermedia Center Osaka University Osaka 567-0047 Japan Computing and Communications Center Kyushu University Fukuoka 812-8581 Japan Tsukuba 305-8568 Japan Computational Science And Engineering Center Fujitsu Ltd. Chiba 261-8588 Japan Tokyo 101-0051 Japan Fujitsu Laboratory Kanagawa 211-8588 Japan

The National Research Grid Initiative (NAREGI) is one of the major Japanese national IT projects currently being conducted. NAREGI will cover the period 2003-2007, and collaboration among industry, academia, and the government will play a key role in its success. The Center for Grid Research and Development has been established as a center for R&D of high-performance, scalable grid middleware technologies, which are aimed at enabling major computing centers to host grids over high-speed networks to provide a future computational infrastructure for scientific and engineering research in the 21st century. As an example of utilizing such grid computing technologies, the Center for Application Research and Development is conducting research on leading-edge, grid-enabled nanoscience and nanotechnology simulation applications, which will lead to the discovery and development of new materials and next-generation nanodevices. These two centers are collaborating to establish daily research use of a multiteraflop grid testbed infrastructure, which will be built to demonstrate the advantages of grid technologies for future applications in all areas of science and engineering. © 2005 IEEE.

关键词： Computation theory

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Complex Nonlinear Deformation of Nanometer Intergranular Glassy Films in β−Si3N4

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Physical Review Letters 2005年第25期95卷 256103-256103页

作者： Jun Chen Lizhi Ouyang Paul Rulis Anil Misra W. Y. Ching Department of Physics University of Missouri–Kansas City Kansas City Missouri 64110 USA Institute of Applied Physics and Computational Mathematics Beijing China 100088 Department of Civil and Mechanical Engineering School of Computing and Engineering University of Missouri–Kansas City Kansas City Missouri 64110 USA

The mechanical properties of a model of Y-doped intergranular glassy film in silicon nitride ceramics are studied by large-scale ab initio modeling. By linking directly to its electronic structure, it is shown that this microstructure has a complex nonlinear deformation under stress and Y doping significantly enhances the mechanical properties. The calculation of the electrostatic potential across the film supports the space charge model in ceramic microstructures.

关键词： Thin films

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ICDAR2005 page segmentation competition

ICDAR2005 page segmentation competition

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International Conference on Document Analysis and Recognition

作者： A. Antonacopoulos B. Gatos D. Bridson Pattern Recognition and Image Analysis (PRImA) Research Laboratory School of Computing Science and Engineering University of Sanford Manchester UK Computational Intelligence Laboratory National Center for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece

There is an established need for objective evaluation of layout analysis methods, in realistic circumstances. This paper describes the page segmentation competition (modus operandi, dataset and evaluation criteria) held in the context of ICDAR2005 and presents the results of the evaluation of four candidate methods. The main objective of the competition was to compare the performance of such methods using scanned documents from commonly-occurring publications. The results indicate that although methods seem to be maturing, there is still a considerable need to develop robust methods that deal with everyday documents.

关键词： Image analysis Performance analysis Image segmentation Text analysis Optical character recognition software Pattern recognition Telecommunication computing computational intelligence Laboratories Informatics

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Automated Characterization of cellular migration phenomena

Automated Characterization of cellular migration phenomena

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2005 IEEE computational Systems Bioinformatics Conference, Workshops and Poster Abstracts

作者： Beaudry, Christian Berens, Michael E. Doker, Tarek El Joy, Anna M. Karam, Lina J. Lacroix, Zoe Lutfi, Jad A. Motoru, Sai Renaut, Rosemary A. Rich, Ian J. Translational Genomics Research Institute Phoenix AZ United States Department of Electrical Engineering Machine Perception Laboratory Northern Arizona University United States Department of Electrical Engineering Image Video and Usability and Multi-D Signal Processing Labs. Arizona State University United States Department of Mechanical and Aerospace Engineering Scientific Data Management Lab. Arizona State University United States Department of Mathematics Computational Biosciences Program Arizona State University United States

No abstract available

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Image-based 3D face modeling system

Image-based 3D face modeling system

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作者： Park, In Kyu Zhang, Hui Vezhnevets, Vladimir School of Information and Communication Engineering Inha University 253 Younghyun-dong Nam-gu Incheon 402-751 Korea Republic of Computing Lab Samsung Advanced Institute of Technology San 14-1 Nongseo-ri Giheung-eup Yongin 449-712 Korea Republic of Graphics and Media Lab Department of Computational Mathematics and Cybernetics Moscow State University Moscow 119899 Russia School of Information and Communication Engineering Inha University Korea Republic of IEEE IEEE Computer Society ACM Samsung Advanced Institute of Technology Yongin Korea Republic of Graphics and Media Lab Computer Science Department Moscow State University

This paper describes an automatic system for 3D face modeling using frontal and profile images taken by an ordinary digital camera. The system consists of four subsystems including frontal feature detection, profile feature detection, shape deformation, and texture generation modules. The frontal and profile feature detection modules automatically extract the facial parts such as the eye, nose, mouth, and ear. The shape deformation module utilizes the detected features to deform the generic head mesh model such that the deformed model coincides with the detected features. A texture is created by combining the facial textures augmented from the input images and the synthesized texture and mapped onto the deformed generic head model. This paper provides a practical system for 3D face modeling, which is highly automated by aggregating, customizing, and optimizing a bunch of individual computer vision algorithms. The experimental results show a highly automated process of modeling, which is sufficiently robust to various imaging conditions. The whole model creation including all the optional manual corrections takes only 2-3 minutes. © 2005 Hindawi Publishing Corporation.

关键词： Computer simulation

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Methods for wave equation prestack depth migration and numerical experiments

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Science China mathematics 2004年第z1期47卷 111-120页

作者： ZHANG Guanquan ZHANG Wensheng Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

In this paper the methods of wave theory based prestack depth migration and their implementation are studied. Using the splitting of wave operator, the wavefield extrapolation equations are deduced and the numerical schemes are presented. The numerical tests for SEG/EAEG model with MPI are performed on the PC-cluster. The numerical results show that the methods of single-shot (common-shot) migration and synthesized-shot migration are of practical values and can be applied to field data processing of 3D prestack depth migration.

关键词： wave operator splitting, 3D prestack depth migration, SEG/EAEG model, synthesized-shot, finite-difference method, factorization method, hybrid method, MPI.

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Towards Matrix-Free AD-Based Preconditioning of KKT Systems in PDE-Constrained Optimization

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PAMM 2005年第1期5卷

作者： Roland Griesse Andrea Walther Johann Radon Institute for Computational and Applied Mathematics (RICAM) Linz Austria Institute of Scientific Computing Technische Universität Dresden Dresden Germany

The presented approach aims at solving an equality constrained, finite-dimensional optimization problem, where the constraints arise from the discretization of some partial differential equation (PDE) on a given space grid. For this purpose, a stationary point of the Lagrangian is computed using Newton's method, which requires the repeated solution of KKT systems. The proposed algorithm focuses on two topics: Firstly, Algorithmic Differentiation (AD) will be used to evaluate the necessary computations of gradients, Jacobian-vector products, and Hessian-vector products, so that only the objective f ( y , u ) and the PDE constraint e ( y , u ) = 0 have to be specified by the user. Secondly, we solve the KKT system iteratively using the QMR algorithm, with preconditioning provided by a multigrid approach. We wish to explore whether the Jacobian-vector products provided by AD are sufficient to construct suitable multigrid preconditioners. Our approach is then embedded into a globalized optimization routine. Numerical results for optimization problems involving a nonlinear reaction-diffusion model will be given. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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Adaptive simulation: dynamic data driven application in geophysical mass flows

Adaptive simulation: dynamic data driven application in geop...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： M.D. Jones A.K. Patra K. Dalbey E.B. Pitman A.C. Bauer Center for Computational Research State University of New York Buffalo NY USA Department of Mechanical and AeroSpace Engineering State University of New York Buffalo NY USA Department of Mathematics State University of New York Buffalo NY USA Scientific Computation Research Center Rensselaer Polytechnic Institute Troy NY USA

The ability to dynamically change data input to a computation is a key feature enabling simulation to be used in many applications. In this study, computation of geophysical mass flow is updated on the fly by changing terrain data. Accommodating such changes in a parallel environment entails new developments in parallel data management and gridding. Adaptivity, and in particular unrefinement, is critical for maintaining parallel efficiency. The application under study in this work is the result of a multidisciplinary collaboration between engineers, mathematicians, geologists, and hazard assessment personnel. In addition, adaptive gridding enables efficient use of computational resources, allowing for run-time determination of optimal computing resources. Combining these attributes allows run time conditions to inform calculations, which in turn provide up-to-date information to hazard management personnel.

关键词： Geophysics computing computational modeling Hazards Personnel Grid computing Data flow computing Environmental management Collaborative work Maintenance engineering Geology

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A non-conforming domain decomposition for Raviart-Thomas vector fields in three dimensions

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Science China mathematics 2004年第z1期47卷 190-199页

作者： HU Qiya Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

In this paper we are concerned with a domain decomposition method with nonmatching grids for Raviart-Thomas finite elements. In this method, the normal complement of the resulting approximation is not continuous across the interface. To handle such non-conformity, a new matching condition will be introduced. Such matching condition still results in a symmetric and positive definite stiffness matrix. It will be shown that the approximate solution generated by the domain decomposition possesses the optimal energy error estimate.

关键词： domain decomposition, nonmatching grids, Raviart-Thomas finite elements, matching condition, error estimate.

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Lie Point Symmetries of Differential-Difference Equations

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Communications in Theoretical Physics 2004年第5期41卷 645-648页

作者： DING Wei~1 TANG Xiao-Yan~(2,3) 1 Department of Applied mathematics,Shanghai Jiao Tong University,Shanghai 200030,China2 Department of Physics,Shanghai Jiao Tong University,Shanghai 200030,China3 State Key Laboratory of scientific and engineering computing,institute of computational mathematics and scientific engineering computing,Academy of mathematics and System Sciences,the Chinese Academy of Sciences,P.O.Box 2719,Beijing 100080,China State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and System Sciences the Chinese Academy of Sciences P.O. Box 2719 Beijing 100080 China

In this paper,the classical Lie group approach is extended to find some Lie point symmetries of differential-difference *** reveals that the obtained Lie point symmetries can constitute a Kac-Moody-Virasoro algebra.

关键词： Lie point symmetry differential-difference equation Kac Moody-Virasoro algebra

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