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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： B. Kurceren J.W. Modestino Dept. of Electr. Comput. & Syst. Eng. Rensselaer Polytech. Inst. Troy NY USA Electrical Computer and Systems Engineering Department Center for Image Processing Research Rensselaer Polytechnic Institute Troy NY USA

The use of forward error-control (FEC) coding, possibly in conjunction with passive-error recovery techniques, has emerged as a promising approach for real-time video transport over ATM networks for cell loss recovery and/or bit error correction, such as might be required for wireless links. Although FEC provides cell-loss recovery, through its erasure correcting capabilities, it also introduces transmission overhead which can possibly cause additional cell losses. A joint source-channel coding methodology is described to maximize the number of video sources multiplexed at a given quality of service (QoS), measured in terms of overall reproduced video quality. The transport channel is modeled as a block interference channel (BIC) and the multiplexer as a single server, deterministic service, finite buffer supporting N users. Based upon an information-theoretic characterization of the BIC and large deviation bounds on the buffer overflow probability, we describe a methodology that provides theoretically achievable upper limits on the number of sources multiplexed at a given level of performance. Performance of a specific coding technique using an MPEG-2 source encoder and interlaced non-binary Reed-Solomon (RS) channel codes is illustrated and shown to approach the information-theoretic predictions with increasing levels of complexity.

关键词： Forward error correction Quality of service Error correction Asynchronous transfer mode Error correction codes Propagation losses Interference channels Multiplexing Buffer overflow Reed-Solomon codes

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Hydrodynamics of otoacoustic emissions

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Canadian Acoustics - Acoustique Canadienne 2000年第3期28卷 152-153页

作者： Jaffer, Taha Kunov, Hans Inst. of Biomaterial/Biomed. Eng. University of Toronto Toronto Ont. M5S 3G9 Canada Dept. of Elec./Computer Engineering University of Toronto Toronto Ont. M5S 3G4 Canada

The basal boundary condition for the classical one-dimensional cochlear model was reconsidered. A revision of the basal boundary condition was derived by considering that the movement of the cochlear partition (CP) introduces additional fluid volume displacements to the stapedial pumping of the oval window. A preliminary simulation was constructed to test the effectiveness of this revised basal boundary condition.

关键词： Acoustic emissions

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Electromagnetic limits of planar integrated resonant/transformer structures for power electronic applications

Electromagnetic limits of planar integrated resonant/transfo...

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IEEE International Workshop on Integrated Power Packaging

作者： J.T. Strydom J.D. Van Wyk J.A. Ferreira Bradley Dept. of Electr. & Comput. Eng. Virginia Polytech. Inst. & State Univ. Blacksburg VA USA NSF ERC for Power Electronics Systems The Bradley Department of Electricaland Computer Engineering Virginia Polytechnic and State University Blacksburg VA USA

ISBN: (纸本)0780364376

The integrated planar resonant/transformer structure analysed is constructed from planar ferrites, conductive layers, leakage layers and slabs of ceramic dielectric. The electromagnetic limits are analysed in terms of the permeabilities, permittivities and conductivities, skin effect, breakdown field and physical dimensions. An example of a converter with an integrated resonant/transformer (LLCT) structure is used to illustrate the analysis. This analysis indicates that the electromagnetic limits results in volumes two orders of magnitude smaller than at present, illustrating that the power density is currently only limited by construction technology. The thermal limit is expected to be the next barrier within one order of magnitude.

关键词： Resonance Electromagnetic analysis Ferrites Slabs Ceramics Dielectrics Electromagnetic fields Permeability Permittivity Conductivity

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Survey of computational complexity results in systems and control

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Automatica 2000年第9期36卷 1249-1274页

作者： Blondel, Vincent D. Tsitsiklis, John N. Dept. of Mathematical Engineering Ctr. Syst. Eng. Appl. and Mechanics University of Louvain B-1348 Louvain-la-Neuve Belgium Lab. for Info. and Decision Systems Massachusetts Inst. of Technology Cambridge MA 02139 United States Massachusetts Inst. of Technology Cambridge MA United States Department of Electrical Engineering Stanford University Stanford CA United States Dept. of EECS University of California Berkeley CA United States Institute for Computer Science Iraklion Greece University of Louvain Louvain-la-Neuve Belgium Fr. Natl. Res. Ctr. Contr. Comp. S. INRIA Paris France Ecole Normale Supérieure Lyon France

The purpose of this paper is twofold: (a) to provide a tutorial introduction to some key concepts from the theory of computational complexity, highlighting their relevance to systems and control theory, and (b) to survey the relatively recent research activity lying at the interface between these fields. We begin with a brief introduction to models of computation, the concepts of undecidability, polynomial-time algorithms, NP-completeness, and the implications of intractability results. We then survey a number of problems that arise in systems and control theory, some of them classical, some of them related to current research. We discuss them from the point of view of computational complexity and also point out many open problems. In particular, we consider problems related to stability or stabilizability of linear systems with parametric uncertainty, robust control, time-varying linear systems, nonlinear and hybrid systems, and stochastic optimal control.

关键词： Computational complexity

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Application of a genetic algorithm in triangulation of a 3-D object surface

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International Journal of computers and Applications 2000年第2期22卷 73-77页

作者： Zhenyu, Chen Mbede, J.B. Yan, Zhou Dehua, Li Hanping, Hu State Commn. Res. Open Lab. Image P. Inst. Pattern Recog. Artif. Intell. Huazhong Univ. of Sci. and Technol. 430074 Wuhan China Intelligent Contr. and Robotics Lab. Dept. of Contr. Sci. and Engineering Huazhong Univ. of Sci. and Technol. 430074 Wuhan China Second Artillery Institute Huazhong Univ. of Sci. and Technol. Inst. Pattern Recog. Artif. Intell. Huazhong Univ. of Sci. and Technol. Second Artillery Institute China Wuhan University China Artificial Intelligence Department University of Edinburgh Inst. of AI and Pattern Recognition Huazhong Univ. of Sci. and Technol. China Cogn. Sci. Natl. Key Found. Res. P. Douala University Cameroon Tübingen University Germany Automatic Control Laboratory Darmstadt University Department of Service Cameroon Min. of National Education Robotics Laboratory Huazhong Univ. of Sci. and Technol. Wuhan China Assoc. Connectionnistes These-ACTH Rennes France IEEE Soc. of Robotics and Automation IEEE Society of Control Systems IASTED Assoc. Jeunes Chercheurs Robotique France Navy University of Engineering China Huazhong Univ. of Sci. and Technol. China Department of Computer Science Airforce Radar Acad. of Engineering China Inst. of P.R and AI Huazhong Univ. of Sci. and Technol.

This paper proposes a genetic-based algorithm for surface reconstruction of three-dimension (3-D) objects from a group of contours representing its section plane lines. The algorithm can optimize the triangulation of the surface of 3-D objects with a multi-objective optimization function to meet the needs of a wide range of applications. Further, a new crossover operator for triangulation and a new 3-D quadrilateral mutation operator are also introduced.

关键词： Object recognition

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Undefined character processing system using character structure analysis by mathematical morphology

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Systems and computers in Japan 2000年第9期31卷 60-71页

作者： Zhu, Qing Kodate, Akihisa Kim, Woontae Urano, Yoshiyori Tominaga, Hideyoshi Telecom. Adv. Organization of Japan Waseda Research Center Tokyo 169-0051 Japan Global Info. Telecommunication Inst. Waseda University Tokyo 169-0051 Japan Dept. Electronics Info. Commun. E. Waseda University Tokyo 169-8555 Japan Beijing Computer Institute Waseda University Telecom. Adv. Organization of Japan Waseda Research Center Info. Processing Society of Japan School of Science and Engineering Waseda University Hanover University Germany Inst. Image Electronics Engineers J. Gyeonggi University Inst. Image Electronics Engineers J. Korea Inst. Telematics Electronics

In this paper, we propose a character processing system (undefined character processing system) that handles characters for which fonts or character code systems have not been provided on the terminals (undefined characters). The undefined characters include characters historically not inst.lled in the input/output environment, such as ancient characters or characters used by minority groups, and characters not used in a particular language system environment. The proposed system uses morphology to analyze the structures of the target undefined characters, generates codes which describe the characters' shapes based on the analysis results, and reconstructs the characters from these codes. A prototype of this system was constructed. The results of the structural analysis of the undefined characters and their reconstructions verified the effectiveness of the proposed system.

关键词： Image reconstruction

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Floating point vectoring algorithm based on fast rotations

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Journal of VLSI Signal Processing Systems for Signal, Image, and Video technology 2000年第2期25卷 125-139页

作者： Van Der Kolk, Kess-Jan Lee, Jeong-A Deprettere, E.F.A. Delft University of Technology Dept. of Info. Technol. and Systems Mekelweg 4 2628 CD Delft Netherlands Chosun University Department of Computer Science SeoSukDong 375 DongGu Kwang-Ju City 501-759 Korea Republic of Leiden University Leiden Inst. of Adv. Comp. Science Niels Bohrweg 1 2333 CA Leiden Netherlands Indiana University Bloomington IN United States University of California Los Angeles CA United States Ghent State University Ghent Belgium Delft University of Technology Delft Netherlands Leiden Inst. of Adv. Comp. Sciences Leiden University Leiden Netherlands Philips Research Eindhoven Netherlands

The idea of approximate rotations has been introduced by J. Gotze and G. Hekstra. G. Hekstra and E. Deprettere extended the concept to orthogonal fast rotations and formalized the concept by providing a fast rotation theory. In this theory, the emphasis has been on fast rotation, whereas fast rotation-based vectorization has only been considered in an approximating sense in examples published by J. Gotze and G. Hekstra. The formalization of fast rotation-based vectorization is the subject of this paper. The few known approximate fast vectorization algorithms are special cases of the generic fast rotation-based vectorization algorithm proposed in this paper.

关键词： VLSI circuits

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A provably efficient computational model for approximate spatiotemporal retrieval 99

A provably efficient computational model for approximate spa...

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7th ACM International Symposium on Advances in Geographic Information Systems, GIS 1999

作者： Vasilis, Delis Christos, Makris Spiros, Sioutas Computer Engineering And Informatics Dept. University Of Patras Greece Greece Computer Technology Institute Patras Greece

ISBN: (纸本)1581132352

The paper is concerned with the effective and efficient processing of spatiotemporal selection queries under varying degrees of approximation. Such queries may employ operators like overlaps, north, during, etc., and their result is a set of entities standing approximately in some spatiotemporal relation? with respect to a query object X. The contribution of our work is twofold: i) First we describe a mathematical framework for representing multidimensional relations at varying granularity levels, modelling relation approximation through the concept of relation convexity. ii) We subsequently exploit the framework for developing approximate spatiotemporal retrieval mechanisms, employing a set of existing as well as new main memory and secondary memory data structures that achieve either optimal or the best known performance in terms of time and space complexity, for both static and dynamic problems. © 1999 ACM.

关键词： Structural optimization

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POS disambiguation and unknown word guessing with decision trees 9

POS disambiguation and unknown word guessing with decision t...

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9th Conference of the European Chapter of the Association for Computational Linguistics, EACL 1999

作者： Orphanos, Giorgos S. Christodoulakis, Dimitris N. Computer Engineering and Informatics Dept. Computer Technology Institute University of Patras Rion Patras26500 Greece

This paper presents a decision-tree approach to the problems of part-of-speech disambiguation and unknown word guessing as they appear in Modern Greek, a highly inflectional language. The learning procedure is tag-set independent and reflects the linguistic reasoning on the specific problems. The decision trees induced are combined with a high-coverage lexicon to form a tagger that achieves 93,5% overall disambiguation accuracy. © EACL 1999. All rights reserved.

关键词： Decision trees

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Utilizing image processing techniques for 3D reconstruction of laser-scanned data

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CIRP Annals - Manufacturing technology 1999年第1期48卷 99-102页

作者： Fischer, A. Manor, A. Lab. for Computer Graphics and CAD Dept. of Mechanical Engineering Technion - Israel Inst. of Technol. Haifa Israel

In Reverse engineering, laser scanners are commonly used since they can sample 3D data fast and very accurately relative to other systems. Laser scanner systems, however, yield an enormous amount of irregular and scattered digitized point data that requires intensive processing in order to reconstruct the surface of the object. It appears that combining 3D scanned data with 2D intensity images can significantly improve the reconstruction process. This paper proposes a new adaptive reconstruction method that integrates information from a CCD camera with scanned laser data. The method is based on: (a) Detecting a 3D boundary of the parametric base surface. (b) Adaptively reconstructing a parametric base surface with a non-self-intersecting grid. (c) Calculating the parameterization of the 3D sampled points. (d) Fitting the surface by applying a least square (LSQ) approximation method with boundary constraints. The feasibility of the parameterization algorithm is demonstrated on sculptured free objects.

关键词： Image reconstruction

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