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International Parallel and Distributed Processing Symposium, IPDPS 2003

作者： Wang, Kai Kim, Sangbae Zhang, Jun Nakajima, Kengo Okuda, Hiroshi Laboratory for High Performance Scientific Computing and Computer Simulation Department of Computer Science University of Kentucky LexingtonKY40506-0046 United States 2-2-54 Naka-Meguro Meguro-ku Tokyo153-0061 Japan Department of Quantum Engineering and System Sciences University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan

ISBN: (纸本)0769519261

We investigate and compare a few parallel preconditioning techniques in the iterative solution of large sparse linear systems arising from solid Earth simulation with and without using contact information in the domain partitioning process. Previous studies are focused on using static or matrix pattern based incomplete LU (ILU) preconditioners in a localized preconditioner implementation. Our current studies are concerned with preconditioner performance for solving two different cases with and without known contact information. For the cases with contact information, we use localized threshold value based incomplete LU (ILUT) preconditioner to improve efficiency. For the cases without contact information, we use a global sparse approximate inverse preconditioner with a static sparsity pattern to achieve robustness. Numerical results from simulating ground motion on a parallel supercomputer are given to compare the effectiveness of these parallel preconditioning techniques. © 2003 IEEE.

关键词： Linear systems

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Visualizing spatial and temporal variability in coastal observatories

Visualizing spatial and temporal variability in coastal obse...

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IEEE Conference on Visualization

作者： W.H. Jimenez W.T. Correa C.T. Silva A.M. Baptista OGI School of Science & Engineering Oregon Health and Sciences University USA Department of Computer Science Princeton University Princeton NJ USA Scientific Computing and Imaging Institute School of Computing University of Utah Salt Lake UT USA

In this paper, we describe a set of 3D and 4D visualization tools and techniques for CORIE, a complex environmental observation and forecasting system (EOFS) for the Columbia River. The Columbia River, a complex and highly variable estuary, is the target of numerous cross-disciplinary ecosystem research projects and is at the heart of multiple sustainable development issues with long reaching implications for the Pacific Northwest. However, there has been until recently no comprehensive and objective system available for modeling this environment, and as a consequence, researchers and agencies have had inadequate tools for evaluating the effects of natural resource management decisions. CORIE was designed to address this gap and is a major step towards the vision of a scalable, multi-use, real-time EOFS. Although CORIE already had a rich set of visualization tools, most of them produced 2D visualizations and did not allow for interactive visualization. Our work adds advanced interactive 3D tools to CORIE, which can be used for further inspection of the simulated and measured data.

关键词： Sea measurements Observatories Rivers Ecosystems Data visualization Predictive models Heart Sustainable development Computational modeling Power engineering computing

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Global and localized parallel preconditioning techniques for large scale solid Earth simulations

Global and localized parallel preconditioning techniques for...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Kai Wang Sangbae Kim Jun Zhang K. Nakajima H. Okuda Laboratory for High Performance Scientific Computing and Computer Simulation Department of Computer Science University of Kentucky Lexington KY USA Research Organization for Information Science and Technology Meguro Tokyo Japan Department of Quantum Engineering and System Sciences University of Tokyo Bunkyo Tokyo Japan

关键词： Large-scale systems Earth Solid modeling Linear systems Sparse matrices Computational modeling computer simulation Uniform resource locators Geoscience Information science

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A NOTE ON VECTOR CASCADE ALGORITHM

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Journal of Computational Mathematics 2002年第4期20卷 363-372页

作者： Qiu-hui Chen Jin-zhao Liu Wen-sheng Zhang Department of Scientific Computing and Computer Applications Zhongshan UniversityGuangzhou510275China Department of Geophysics Peking UniversityBeijing 100871China ICMSEC Academy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China

The focus of this paper is on the relationship between accuracy of multivariate refinable vector and vector cascade algorithm. We show that, if the vector cascade algorithm (1.5) with isotropic dilation converges to a... 详细信息

关键词： cascade algorithm accuracy symbol refinable vector

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C¹ modeling with hybrid multiple-sided a-patches

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International Journal of Foundations of computer Science 2002年第2期13卷 261-284页

作者： Xu, Guoliang Bajaj, Chandrajit L. Evans, Susan State Key Lab. of Scientific and Engineering Computing ICMSEC Chinese Academy of Sciences Beijing China Department of Computer Science University of Texas Austin TX 78712 United States Department of Computer Science University of Purdue West Lafayette IN United States

We propose a new scheme for modeling a smooth interpolatory surface, from a surface discretization consisting of triangles, quadrilaterals and pentagons, by algebraic surface patches which are subsets of real zero contours of trivariate rational functions defined on a collection of tetrahedra and pyramids. The rational form of the modeling function provides enough degrees of freedom so that the number of the surface patches is significantly reduced, and the surface has quadratic recover property. © 2002 World scientific Publishing Company.

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Acoustic scattering on arbitrary manifold surfaces

Acoustic scattering on arbitrary manifold surfaces

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Geometric Modeling and Processing, GMP 2002

作者： Bajaj, C. Xu, Guoliang Warren, J. Department of Computer Sciences Texas Institute of Computational and Applied Mathematics University of Texas AustinTX78712 United States Institute of Computational Mathematics and Scientific/Engineering Computing Chinese Academy of Sciences Beijing China Department of Computer Science Rice University HoustonTX United States

ISBN: (纸本)0769516742

We propose the use of surface subdivision as adaptive and higher-order boundary elements for solving a Helmholtz partial differential equation to calculate accurate acoustic scattering on arbitrary manifolds. Such acoustic transfer functions prove useful for designing and tuning hearing aid devices for hearing impaired individuals. The number of unknowns of the discretized linear system is the same as that in a linear element approach. Our results show that the accuracy of the subdivision approach is much better than that of the linear element approach. © 2002 IEEE.

关键词： Hearing aids

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Rate scalable video compression based on flexible block wavelet coding technique

Rate scalable video compression based on flexible block wave...

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Data Compression Conference (DCC)

作者： Ming Wei Hongyang Chao Department of Computer Sciences University of North Texas Denton TX USA Department of Scientific Computing and Computer Applications Zhongshan University Guangzhou China

ISBN: (纸本)0769514774

Summary form only given. We present a new wavelet coding technique, flexible block wavelet coding (FBWC). It is specially designed for delta frame compression. FBWC not only makes delta frame compression more efficient but also keeps the rate scalability and other scalabilities of wavelet based scalable video compression techniques. Based on this new delta frame compression technique, we have implemented a highly efficient rate scalable video codec. Its overall performance surpasses the video codec based on SPIHT and is comparable to that of H.263. Using FBWC, delta frames are compressed in three steps: First, we use motion compensation to eliminate the temporal redundancy between adjacent frames and the predicted error frames (PEF) are generated. Next, the PEF are transformed into the wavelet domain using the flexible block wavelet transform (FBWT). Finally, the zerotree coding mechanism and entropy coder are used to actually compress the FBWT transformed wavelet coefficients to the target data rate.

关键词： Video compression Wavelet transforms Scalability Motion compensation Chaos Video codecs Wavelet domain PSNR scientific computing computer applications

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A NOTE ON FINITE ELEMENT WAVELETS

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Acta Mathematicae Applicatae Sinica 2001年第4期17卷 517-525页

作者：谌秋辉陈翰麟 Department of Scientific Computing and Computer Application Zhongshan University Guangzhou China Institute of Mathematics Academy of Mathematics and System Science Chinese Academy of Sciences Beijing China

The refinability and approximation order of finite element multi-scale vector are discussed in [1]. But the coefficients in the conditions of approximation order of finite element multi-scale vector are incorrect there. The main purpose of this note is to make a correction of the error in the main result of [1]. These Cuefficients are very important for the properties of wavelets, such as vanishing moments and regularity.

关键词： Approximation order symbol multi-scale vector matrix dilation equation

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Intelligent diabetes management

Intelligent diabetes management

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Garcia, Mario A. Steidley, Carl Dantu, Maruthi Shen, Rui Texas A and M Univ. Corpus Christi Department of Computer Science Department of Computing Sciences NASA Ames Research Center Oak Ridge Natl. Labs. Electro Scientific Industries Portland

Diabetes is a disease that affects many people in the world1. Diabetes cost in the U.S.A. is estimated to represent 5.8% of total personal health-care expenditures. In Europe diabetes is estimated to consume about 10% of the total health care budget. An Intelligent Diabetes Management System was developed by computer science students at Texas A&M University Corpus Christi to help people monitor and control the blood glucose level. The diabetes experts were Dr. Steve Ponder and Dr. Hilda Ramirez from Driscoll Children's Hospital. This paper describes the steps followed to implement it.

关键词： Intelligent agents

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Adaptive fairing of surface meshes by geometric diffusion

Adaptive fairing of surface meshes by geometric diffusion

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International Conference on Information Visualisation (IV)

作者： C.L. Bajaj Guoliang Xu Department of Computer Sciences University of Technology Austin TX USA State Key Laboratory of Scientific and Engineering Computing Chinese Academy and Sciences Beijing China

In triangulated surface meshes, there are often very noticeable size variances (the vertices are distributed unevenly). The presented noise of such surface meshes is therefore composite of vast frequencies. We solve a diffusion partial differential equation numerically for noise removal of arbitrary triangular manifolds using an adaptive time discretization. The proposed approach is simple and is easy to incorporate into any uniform timestep diffusion implementation with significant improvements over evolution results with the uniform timesteps. As an additional alternative to the adaptive discretization in the time direction, we also provide an approach for the choice of an adaptive diffusion tensor in the diffusion equation.

关键词： Laplace equations Frequency Low-frequency noise Smoothing methods Differential equations Tensile stress Noise reduction Image processing Filters Partial differential equations

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