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Journal of computer Science & technology 2006年第5期21卷 665-673页

作者：陈国良孙广中张云泉莫则尧 Anhui Province-MOST Key Co-Lab of High Performance Computing and Its Applications Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 P.R. China Laboratory of Parallel Computing Institute of Software Chinese Academy of Sciences Beijing 100080 P.R. China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 P.R. China

In this paper, we present a general survey on parallel computing. The main contents include parallel computer system which is the hardware platform of parallel computing, parallel algorithm which is the theoretical base of parallel computing, parallel programming which is the software support of parallel computing. After that, we also introduce some parallel applications and enabling technologies. We argue that parallel computing research should form an integrated methodology of ＂architecture algorithm programming application＂. Only in this way, parallel computing research becomes continuous development and more realistic.

关键词： parallel computing parallel architecture parallel programming parallel algorithm parallel application

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A CLASS OF TWO-STEP CONTINUITY RUNGE-KUTTA METHODS FOR SOLVING SINGULAR DELAY DIFFERENTIAL EQUATIONS AND ITS STABILITY ANALYSIS

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Journal of Computational Mathematics 2005年第6期23卷 647-656页

作者： Xin Leng De-gui Liu Xiao-qiu Song Li-rong Chen Beijing Institute of Computer Application and Simulation Technology 100854 China Beijing Institute of Applied Physics and Computational Mathematics 100088 China

In this paper, a class of two-step continuity Runge-Kutta（TSCRK） methods for solving singular delay differential equations（DDEs） is presented. Analysis of numerical stability of this methods is given. We consider the two distinct cases：（i）τ≥ h, （ii）τ 〈 h, where the delay τ and step size h of the two-step continuity Runge-Kutta methods are both constant. The absolute stability regions of some methods are plotted and numerical examples show the efficiency of the method.

关键词： Analysis of numerical stability Singular delay differential equations Two-step continuity Runge-Kutta methods

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Illustrative visualization

Illustrative visualization

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VIS 05: IEEE Visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： Visualization

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Soil moisture retrieval from MODIS data in northern china plain using thermal inertia model (SoA-TI)

Soil moisture retrieval from MODIS data in northern china pl...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Guoyin Cai Jian Wu Yong Xue Yincui Hu Jianping Guo Jiakui Tang State Key Laboratory of Remote Sensing Science Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing Normal University Beijing China Department of Computer Science Beijing Information Technology College Beijing China Department of Computing London Metropolitan University London UK

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The recent research on virtual prototyping engineering for complex products

The recent research on virtual prototyping engineering for c...

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International Conference on computer Supported Cooperative Work in Design

作者： Bo Hu Li Xudong Chai Wenhai Zhu Yanqiang Di Xiao Song Xuefeng Yan Peng Wang Baocun Hou Gouqiang Shi Xiaohua Wang Beijing Aeronautics and Astronautics University Beijing China Beijing Simulation Center Beijing China CS Department Beijing Institute of Technology Beijing China Computer Science & Technology Institute Harbin Institute of Technology Harbin China

ISBN: (纸本)0780379411

In recent years, based on the previous research work, "virtual prototyping engineering for complex product (CPVPE)" project, combined with current technology developments and application requirements, is further studied and practiced. Some latest research results gained are introduced in This work in detail, which include the collaborative simulation grid based system technology for CPVPE, component based collaborative modeling and simulation technology for CPVP (complex product virtual prototype), multidisciplinary design optimization technology for CPVP, collaborative virtual environment technology, collaborative simulation grid platform based supporting environment technology for CPVPE, etc. Furthermore, a tools suit for CPVPE, namely COSIM-grid, developed by authors and their colleagues is presented. At last, some typical cases based on COSIM-grid are also presented.

关键词： Virtual prototyping Design engineering Space technology Design optimization Collaboration Collaborative work Virtual environment Automotive engineering Systems engineering and theory Collaborative tools

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Distributed ids tracing back to attacking sources

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2nd International Workshop on Grid and Cooperative Computing, GCC 2003

作者： Liu, Wu Duan, Hai-Xin Wu, Jian-Ping Ren, Ping Lu, Li-Hua Chengdu Institute of Computer Applications Chinese Academy of Sciences Chengdu610041 China Network Research Center of Tsinghua University Beijing100084 China Sichuan Agricultural University DujiangyanSichuan611830 China Business Management School of Sichuan University Chengdu610064 China Electronic Science and Technical College National University of Defense Technology Changsha410073 China

ISBN: (纸本)3540219889

In this paper we present robust algorithms of transmission and reconstruction of attacking path(s) in IDS for providing traceback information in IP packets without requiring interactive operational support from Internet Service Providers, which is based on IP address compression techniques, polynomial theory and techniques from algebraic coding theory. Our best scheme has improved robustness over previous combinatorial approaches, both for noise elimination and multiple-path re-construction. Another key advantage of our schemes is that they will automatically benefit from any improvement in the underlying mathematical techniques, for which progress has been steady in recent years. © Springer-Verlag Berlin Heidelberg 2004.

关键词： computer programming

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Class of modified parallel combined methods of real-time numerical simulation for a stiff system

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Chinese Journal of Systems Engineering and Electronics 2004年第3期000卷

A class of modified parallel combined methods of real-time numerical simulation are presented for a stiff dynamic system. By combining the parallelism across the system with the parallelism across the method, and relaxing the dependence of stage value computation on sampling time of input function, a class of modified real-time parallel combined methods are constructed. Stiff and nonstiff subsystems are solved in parallel on a parallel computer by a parallel Rosenbrock method and a parallel RK method, respectively. Their order conditions and convergences are discussed. The numerical simulation experiments show that this class of modified algorithms can get high speed and efficiency.

关键词： stiff system real-time numerical simulation parallel combined method

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Shift visual cryptography scheme of two secret images

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自然科学进展(英文版) 2003年第6期13卷 457-463页

作者： WANG Daoshun LUO Ping YANG Lu Qi Dongxu Dai Yiqi Department of Computer Science and Technology Tsinghua University Beijing 100084 China Chengdu Institute of Computer Applications Chinese Academy of Sciences Chengdu 610041 China School of Information Science and Technology Zhongshan University Guangzhou 510275 China

A new visual cryptography scheme of two secret images, which is named the shift visual cryptography of two secret images, is given. The compound function family of a general construction model is also introduced. The uniqueness and validity of this model are proved, and the minimum rows and columns for realizing the scheme are obtained. Compared with visual cryptography of one secret image, the shift visual cryptography scheme can share two secret images with the same size of pixels expansion without losing the contrast. It has randomness and various forms, and furthermore, we can also visually recover two secret images even if the two shares are different in form and color.

关键词： visual cryptography compound function family minimum threshold scheme

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A new method for classification and segmentation of the textured images

A new method for classification and segmentation of the text...

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Picture Coding Symposium

作者： Wang, Yao-Wei Wang, Yan-Fei Gao, Wen Xue, Yong Institute of Computer and Technology Chinese Academy of Sciences Beijing 100080 China Lab. of Remote Sensing Info. Sci. Inst. of Remote Sensing Applications Chinese Academy of Sciences PO Box 9718 Beijing 100101 China Department of Computing London Metropolitan University 166-220 Holloway Road London N7 8DB United Kingdom

ISBN: (纸本)2726112420

Texture provides a very useful cue for retrieving images from a database. Many objects can be recognized based on their distinctive texture patterns. In this paper, we propose a new method, called the regularized simultaneous autoregressive method (RSAR), for texture classification and segmentation. The usual approach is the LSE method. But we observe that LSE is unstable in practical applications. To overcome this shortcoming, we introduce the regularization technique, i.e., the new method uses the basic SAR model and add a regularization term. With this technique, experiments are given to show the new algorithm RSAR outperforms the traditional algorithm LSE for classification and segmentation of the textured images.

关键词： Image analysis

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Wavelet-based analysis of network security databases

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International Conference on Communication technology (ICCT)

作者： Wu Liu Haixin Duan Peng Wang Jianping Wu Lu Yang Department of Computer Science and technology Sichuan Agricultural University Dujiangyan China Network Research Center Tsinghua University Beijing China Chengdu Institute of Computer Applications Chinese Academy and Sciences Chengdu China

ISBN: (纸本)7563506861

The phenomenal increase in the amounts of network security data are due to the hacker attacks, virus, worm and Shapper etc. Network security log file databases are very important in computer forensics. From researches, a lot of data mining methods have been found, such as content-based queries and similarity searches to manage and use such data. Fast and accurate retrievals for content-based queries are crucial for such numerous database systems to be useful. In this paper, a new method is provided to analyze and mine this kind of time-serial database. We first signalize the NSD databases, then we use these wavelet based transform to analyze the NSD and get the periodic law of intrusion event.

关键词： Wavelet analysis Data security Databases computer hacking computer worms computer security computer networks Forensics Data mining Content management

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