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作者： Liu, K. Wang, Xiao-Bing Zhang, Yang Liao, Cheng Institute of Electromagnetics Southwest Jiaotong University Chengdu Sichuan 610031 China School of Computer Science and Engineering University of Electronic Science and Technology of China China Hardware Architecture Sector of S3 Graphics ShangHai China

ISBN: (纸本)1424401623

The Time-Domain Finite Element Method is used extensively in areas of microwave engineering. However, TD-FEM runs too slow for some simulations to be practical, especially when run on standard personal computers. The propriety of hardware for the acceleration of TD-FEM computations has been investigated. It is well known that the key of TD-FEM is matrix operation. There always be an obstacle that the speedup of dense matrices operations in graphics Processor Units fields. This situation will be improved in next generation. Even though the presence of the obstacle, the standard consumer graphics Processor Units (GPUs) can be used to accelerate TD-FEM simulations by a factor of close to two yet, relative to an Intel CPU of similar technology generation. With OpenGL as the Application Programming Interface (API), a standard commercial graphics card has been programmed to solve a 2-D electromagnetic radiation problem.

关键词： Electromagnetic waves

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A NEW POINT-BASED RENDERING METHOD FOR RAY TRACING

A NEW POINT-BASED RENDERING METHOD FOR RAY TRACING

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2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： GUO-LIANG ZHOU YUN-JIE PANG ZHEN-HUA ZHANG YONG QUAN WEN-HUI LI Computer Graphics Laboratory College of Computer Science and Technology Jilin University Qianwei Key Laboratory for Symbolic Computation and Knowledge Engineering of Ministry of Education

In this paper a new point-based rendering method for ray tracing is presented. An oriented spherical patch that passes a surface point is used to approximate the vicinity of that *** this paper the spherical patch together with the surface point is called "Spherical Patch Point" (SPP). Due to property of curvature, SPP can achieve similar visual quality compared with previous methods with much fewer points. This paper defines new point attributes for the purpose of efficiently locating the intersection between incoming ray and ***, an algorithm of intersecting a ray with point geometry is proposed. The algorithm can achieve a higher rendering speed in comparison with previous methods. The presented technique deals well with shadow, reflection and refraction.

关键词： Point-based rendering Curvature Spherical patch Radius Ray tracing

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COMPUTING AND RAY TRACING POINT-BASED GEOMETRY

COMPUTING AND RAY TRACING POINT-BASED GEOMETRY

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2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： YUN-JIE PANG BIN ZHOU YONG QUAN WEN-HUI LI Computer Graphics Laboratory College of Computer Science and Technology Jilin University Qianwei Key Laboratory for Symbolic Computation and Knowledge Engineering of Ministry of Education

In this paper a new technique for computing and ray tracing point based geometry is presented. It uses a novel point primitive that is called "Spherical Patch Point" (SPP) to approximate the vicinity of a surface point. Due to property of curvature, SPP can achieve similar visual quality compared with previous methods with much fewer primitives for the cost of a few additional bytes per point and thus makes a significant reduction in rendering time. During pre-process,important attributes are added to each SPP for the purpose of ray tracing. During rendering, an intersection algorithm different from previous ones has been demonstrated to get satisfied results. The proposed technique makes it possible to render high quality ray traced images with global illumination using SPPs. It offers a higher ray tracing speed in comparison with previous methods.

关键词： Points Curvature Sphere Radius Ray tracing

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Monte Carlo go has a way to go

Monte Carlo go has a way to go

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21st National Conference on Artificial Intelligence and the 18th Innovative Applications of Artificial Intelligence Conference, AAAI-06/IAAI-06

作者： Yoshimoto, Haruhiro Yoshizoe, Kazuki Kaneko, Tomoyuki Kishimoto, Akihiro Taura, Kenjiro Department of Information and Communication Engineering University of Tokyo Japan Graduate School of Information Science and Technology University of Tokyo Japan Department of Graphics and Computer Sciences University of Tokyo Japan Department of Media Architecture Future University Hakodate Japan

ISBN: (纸本)1577352815

Monte Carlo Go is a promising method to improve the performance of computer Go programs. This approach determines the next move to play based on many Monte Carlo samples. This paper examines the relative advantages of additional samples and enhancements for Monte Carlo Go. By parallelizing Monte Carlo Go, we could increase sample sizes by two orders of magnitude. Experimental results obtained in 9 × 9 Go show strong evidence that there are trade-offs among these advantages and performance, indicating a way for Monte Carlo Go to go. Copyright © 2006, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Monte Carlo methods

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Visual culling techniques for geometric processing in walkthrough application

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Journal of Computational Information Systems 2006年第1期2卷 421-427页

作者： Sunar, Mohd Shahrizal Sembok, Tengku Mohd Tengku Zin, Abdullah Mohd Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System University Teknology Malaysia 81310 Skudai Johor Malaysia Faculty of Information Science and Technology University Kebangsaan Malaysia 43600 Bangi Selangor Malaysia

Virtual reality is a modern approach for problem solving and strategy planning. It saves cost and time for production. Virtual walkthrough application allows users to navigate and absorb in the generated 3D environment with computer graphics assistance. Virtual reality engine is the most important component in virtual reality system. The basic element in virtual reality engine is graphics display. Nevertheless, on the system development where 3D graphics is necessary, there is a conflict between realistic and real time. This paper illustrates the implementation of visual culling techniques such as view frustum culling, back face culling and occlusion culling in the virtual walkthrough application. With the visual culling techniques implemented in the proposed virtual walkthrough system works in real time mode without scarifying realism factor.

关键词： Virtual reality

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Design of a Navigator for the Optimized Path-Tracking of Underwater ROVs using a Nero-Genetic Fuzzy Controller

Design of a Navigator for the Optimized Path-Tracking of Und...

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Proceedings of the Biannual World Automation Congress

作者： Hamed Kashani Mohammad Hossein Saghafi Mahmood Fathy Mohsen Soriani Computer Engineering Iran University of Science and Technology Iran MSc. Student of Computer Eng. at Iran University of Science and Technology(IUST) Iran MSc. Student of Mechanical Eng. at Sharif University of Technology Iran Computer Engineering IUST University Iran Professor of Computer Eng. at IUST Iran Mohsen Soriani Assistant Professor of Computer Eng. at IUST Iran

This paper proposes a sub-time-optimum soft-computing based controller to follow a desired path with a desired velocity by mobile robots with identified dynamical behavior. This method consists of a fuzzy controller where a trained neural network sets its membership functions values in on-line mode. Training of the network is done by a genetic algorithm for various vehicle initial positions and different path convexities in off-line. After the training of the network, during vehicle motion, it retrieves sub-optimized fuzziness values and sends them to the fuzzy control algorithm according to the vehicle position. Meanwhile, the influential of the path convexity is considered in fuzziness of membership functions. This method leads us to make almost the best decision for the mobile robot at each moment. This method is applied to an underwater remotely operated vehicle (ROV) to develop an autopilot for its control system. Simulation results show good performance of the method in this specifics problem.

关键词： Navigation Design optimization Remotely operated vehicles Fuzzy control Mobile robots Velocity control Fuzzy neural networks Fuzzy sets Neural networks Genetic algorithms

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Anycast Algorithms Supporting Optical Burst Switched Grid Networks

Anycast Algorithms Supporting Optical Burst Switched Grid Ne...

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International Conference on Networking and Services (ICNS)

作者： M. De Leenheer F. Farahmand Kejie Lu Tao Zhang P. Thysebaert B. Volckaert F. De Turck B. Dhoedt P. Demeester J.P. Jue Department of Information Technology Ghent University - IBBT - IMEC Department of Computer Electronics and Graphics Technology Central Connecticut State University Department of Electrical and Computer Engineering University of Puerto Rico at Mayagüez Department of Computer Science New York Institute of Technology Old Westbury Department of Electrical Engineering and Computer Science The University of Texas at Dallas

In this paper we consider implementing optical burst switching as a technology for building grids with computationally intensive requirements. This architecture has been referred to as grid-over-OBS (GoOBS). First, we briefly describe the proposed layered grid architecture and show how OBS can be positioned within the grid architecture. Then, we present a generic framework for anycast routing in the context of GoOBS when requests don't have an explicit destination address and they can be serviced by any appropriate grid resource. We also develop several algorithms to support anycasting when only a single copy of a request is transmitted. Through simulation analysis, we show the performance of our anycast algorithms and compare them with traditional shortest-path unicast routing in which all jobs have specific addresses. Our performance analysis focuses on blocking probability of requests and average end-to-end delay

关键词： Optical fiber networks computer architecture Routing Performance analysis Optical burst switching Buildings Grid computing Optical computing Context-aware services Analytical models

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Special Issue on Variable Structure System Control — New Designs and Applications

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Asian Journal of Control 2008年第4期5卷

作者： Prof. Jian-Xin Xu Prof. Leonid Fridman Department of Electrical and Computer Eng. National University of Singapore 4 Engineering Drive 3 Singapore 117576 Tel +65 6874-2566 Fax +65 6779-1103 Dr Jian-Xin Xu received his Bachelor degree from Zhejiang University China in 1982. He attended the University of Tokyo Japan where he received his Master's and Ph.D. degrees in 1986 and 1989 respectively. All his degrees are in Electrical Engineering. He worked for one year in the Hitachi research Laboratory Japan and for more than one year in Ohio State University U.S.A. as a Visiting Scholar. In 1991 he joined the National University of Singapore and is currently an associate professor in the Department of Electrical Engineering. His research interests lie in the fields of learning control variable structure control fuzzy logic control discontinuous signal processing and applications to motion control and process control problems. He is the associate editor of Asian Journal of Control member of TC on variable structure systems and sliding mode control of IEEE Control Systems Society and a senior member of IEEE. He has produced more than 90 peer-refereed journal papers near 160 technical papers in conference proceedings and authored/edited 4 books. Division de Estudios de Posgrado Facultad de Ingenieria National Autonomous University of Mexico DEP-FI UNAM Edificio “A” Circuito Exterior Ciudad Universitaria A. P. 70–256 C.P.04510 Mexico D.F. Mexico Tel +52 55 56223014 Fax +52 55 56161719 Dr. Leonid M. Fridman received his M.S in mathematics from Kuibyshev (Samara) State University Russia Ph.D. in Applied Mathematics from Institute of Control Science (Moscow) and Dr. of Science degrees in Control Science from Moscow State University of Mathematics and Electronics in 1976 1988 and 1998 respectively. In 1976–1999 Dr. Fridman was with the Department of Mathematics at the Samara State Architecture and Civil Engineering Academy Samara Russia. In 2000–2002 he was with the Department of Postgraduate Study and Investigations at the Chihuahu

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Range Detection Approach in Interactive Virtual Heritage Walkthrough

Range Detection Approach in Interactive Virtual Heritage Wal...

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International Conference on Artificial Reality and Telexistence (ICAT)

作者： M.S. Sunar A.M. Zin T.M.T. Sembok Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

Exploring virtual world will give a memorable experience to the users. Generally, they are expecting smooth navigation with high quality image drawn into their eyes. Nevertheless, when the virtual world is growing simultaneously with the number of objects, the navigation will be detained. Yet, the frame rates can become unacceptable. In this paper, we present and examine range detection approach for view frustum culling to effectively speed-up the interactive virtual heritage project namely Ancient Malacca Virtual Walkthrough. Normal six plane view frustum culling approach use the plane equation to test whether objects is within the visible region. However, range detection approach is different with normal six plane view frustum. It is based on camera referential point and tests the objects if they are in the viewing range. The results show that this approach is able to increase the rendering performance of the virtual walkthrough without sacrificing the visual quality.

关键词： computer graphics Application software Navigation Rendering (computer graphics) Visualization Testing Cameras Virtual environment Multimedia systems computer science

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Accelerating virtual walkthrough with visual culling techniques

Accelerating virtual walkthrough with visual culling techniq...

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International Conference on Computing & Informatics (ICOCI)

作者： Mohd Shahrizal Sunar Tengku Mohd Tengku Sembok Abdullah Mohd Zin Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

Virtual walkthrough application allows users to navigate and immerse in the generated 3D environment with computer graphics assist. The 3D environment requires a large amount of geometry to make it look realistic. When the number of geometry increase, the performance of the application will become slower. Consequently, it creates a conflict between the needs of realistic and real time. In this paper, we discuss the implementation of visual culling techniques such as view frustum culling, back face culling and occlusion culling in the virtual walkthrough application. We render only what we can see during the application runtime and cull away unnecessary geometry. This will accelerate the performance of the system. Without the culling techniques implemented in virtual reality application such as virtual walkthrough, the system has to allocate a large space of memory to store the geometry data. We have tested these techniques to the Ancient Malacca data. With the visual culling techniques implemented, the virtual walkthrough system can work in real time mode without scarifying realism factor.

关键词： Acceleration Computational modeling Geometry Virtual reality computer graphics Application software Navigation Testing Real time systems Visualization

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