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6th IEEE International Conference on Electronics, Circuits and Systems, ICECS 1999

作者： Vergos, H.T. Bellos, M. Nikolos, D. Dept. of Computer Engineering and Informatics University of Patras Rio26 500 Greece Computer Technology Intsitute 3 Kolokotroni Str. Patras262 61 Greece

ISBN: (纸本)0780356829

In this paper we present two methods for path delay fault testing of circuit-switched Benes Multistage Interconnection Networks (MINs) with centralized control. Although the number of paths is O(n3), the first method exploiting the inherent parallelism of the Benes MIN requires O(n2) pairs of test vectors. In the second method we propose the selection of a minimal subset of paths, that are robustly testable by only O(log2n) test vector pairs. The delay along all other paths can be calculated based on the selected path delays. © 1999 IEEE.

关键词： Delay circuits

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Edge coloring of bipartite graphs with constraints 24th

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24th International Symposium on Mathematical Foundations of computer Science, MFCS 1999

作者： Caragiannis, Ioannis Kaklamanis, Christos Persiano, Pino Computer Technology Institute and Dept. of Computer Engineering and Informatics University of Patras Rio26500 Greece Dipartimento di Informatica ed Appl Università di Salerno Baronissi84081 Italy

ISBN: (纸本)3540664084

It is a classical result from graph theory that the edges of an l-regular bipartite graph can be colored using exactly l colors so that edges that share an endpoint are assigned different colors. In this paper we study two constrained versions of the bipartite edge coloring problem. Some of the edges adjacent to a pair of opposite vertices of an l-regular bipartite graph are already colored with S colors that appear only on one edge (single colors) and D colors that appear in two edges (double colors). We show that the rest of the edges can be colored using at most max{min{l+D,3/l2},l+S+D/2} total colors. We also show that this bound is tight by constructing inst.nces in which max{min{l+D,3/l2},l+S+D/2} colors are indeed necessary. Some of the edges of an l-regular bipartite graph are already colored with S colors that appear only on one edge. We show that the rest of the edges can be colored using at most max{l + S/2, S} total colors. We also show that this bound is tight by constructing inst.nces in which max{l + S/2, S total colors are necessary. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Color

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A Web-based distributed environment to support teleteaching: design and implementation issues

A Web-based distributed environment to support teleteaching:...

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International Workshop on Database and Expert Systems Applications

作者： Ch. Couras A. Gkamas Th. Tsiatsos Comput. Technol. Inst. Patras Univ. Greece Computer Technology Institute Greece Computer Engineering and Informatics Department University of Patras Greece

Web based systems have been shown to be useful tools for supporting educational communication for teachers and students. In this paper we present such a system, which is an integrated distributed learning environment (IDLE). We present the technical description of this IDLE and we discuss its main characteristics like the transmission of multimedia data over the network, the manipulation of the educational procedure and the management of the users. In addition we list the functionalities of the IDLE and also discuss some implementation issues.

关键词： Educational technology informatics Multimedia systems Collaborative tools World Wide Web computer networks Web and internet services Transport protocols Application software Learning systems

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Caption segmentation method in videos using isodata clustering of topographical features

Caption segmentation method in videos using isodata clusteri...

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1999 IEEE Region 10 Conference, TENCON 1999

作者： Chun, Byung Tae Bae, Yonglae Kim, Tai-Yun Image Process. Dept. Electron. and Telecommun. Res. Inst. 161 Kajong-Dong Daejeon305-350 Korea Republic of Dept. of Computer Science and Engineering Korea University Anam-dong Seongbuk-ku Seoul136-701 Korea Republic of

ISBN: (纸本)0780357396

Conventional caption extraction approaches often use a spatial variance method or a color reduction method such as color histogram and color quantization. These methods are time-consuming and restrict the colors for extracting captions. In this paper we propose a method that extracts caption areas using TFs (topographical features) and isodata color clustering. After extracting TFs points using the topographical characteristics of characters, the isodata clustering method is used to cluster the similar colors. The point-line-region method is used to construct the blocks for each of the clustered groups. Constructed blocks are verified and candidate areas are decided. Caption regions are determined by testing several conditions and verifying those candidate areas. Experimental results show that the candidate region extraction rate is 100%, and the character region extraction rate is 98%. © 1999 IEEE.

关键词： Color

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BER Analysis of Binary CP-FSK with Energy Detection and Sequence Estimation on Frequency Selective Multipath Channels

BER Analysis of Binary CP-FSK with Energy Detection and Sequ...

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1999 IEEE International Conference on Communications, ICC 1999

作者： Iwanami, Yasunori Wittke, Paul H. Dept. of Electr. and Comput. Eng. Nagoya Inst. of Technol. Japan Department of Electrical and Computer Engineering Queen's University KingstonONK7L3N6 Canada

ISBN: (纸本)078035284X

The energy detection of continuous phase frequency shift keying (CP-FSK) signals is the optimum noncoherent detection technique yielding a minimum bit error rate (BER) on the additive white Gaussian noise (AWGN) channel. This scheme is usually used when carrier phase estimation is difficult. When a CP-FSK signal is passed through a frequency selective multipath fading channel, inter-symbol interference (ISI) is introduced which distorts the received signal waveform. However, this ISI can be compensated and the BER improved by use of sequence estimation at the output of the energy detectors. In this paper, we derive an analytical upper bound as well as a lower bound on the BER for this scheme on the multipath fading channels and compare the results with the computer simulation to show the effectiveness of the technique. © 1999 IEEE.

关键词： Bit error rate

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A hierarchical workcell model for intelligent assembly and disassembly 3

A hierarchical workcell model for intelligent assembly and d...

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3rd IEEE International Symposium on Computational Intelligence in Robotics and Automation, CIRA 1999

作者： Mok, Swee M. Wu, Chi-Haur Lee, D.T. Motorola Inc. 1301 East Algonquin Road SchaumburgIL60196 United States Dept. of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Inst. of Information Science Academia Sinica Nankang Taipei Taiwan

ISBN: (纸本)0780358066

An intelligent Virtual Assembly and Disassembly (VIRAD) system that can be integrated into a CAD/CAM environment is developed for designers to evaluate products for assembly and disassembly efficiencies during the design process. The VIRAD system uses a hierarchical model of a Generic Assembly and Disassembly (GENAD) workcell to generate merging trees for simulating assembly and disassembly processes. In a GENAD workcell, every object is either a part for making a product or a handler to facilitate the workcell operations. Each workcell operation is associated with a cost for product assembly and disassembly. The estimated cost is used for representing a product's manufacturability, providing important feedback for the designer. This paper presents details of the GENAD workcell model and its inner representation. © 1999 IEEE.

关键词： Assembly

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Control of ferroelectric properties of PbZrxTi1-xO3 thin film for electron emission device driven by low voltage

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Materials Research Society Symposium - Proceedings 1999年 541卷 759-764页

作者： Yamagata, Y. Yamazato, M. Ikegami, T. Ebihara, K. Narayan, J. Grishin, A.M. Dept. of Electrical and Computer Engineering Kumamoto Univ. Kumamoto 860-8555 Japan Dept. of Materials Science and Engineering North Carolina State University 2147 Burlington Labs. Raleigh NC 27695-7916 United States Dept. of Condensed Matter Physics Royal Inst. of Technology S-100 44 Stockholm Sweden

Epitaxial PbZr0.52Ti0.48O3/YBa2Cu3O7-x heterostructures on Nd:YAlO3 and MgO substrates were fabricated by KrF pulsed laser deposition. The coercive electric field of the PZT films increased with decrease of the film thickness from 1.2 μm to 0.04 μm, while the magnitude of spontaneous polarization was almost constant in this thickness range. It was found that the dependence of the film thickness d on the coercive electric field Ec was Ec ∝ d-2/3. This results from that the PZT/YBCO heterostructure has the one dimensional ferroelectric domain growth without non-ferroelectric phase. The polarization of Au/PZT/YBCO/(MgO or YAlO) capacitors can be changed by the applied voltage below 5 V.

关键词： Semiconducting lead compounds

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Collision resolution in packet radio networks using rotational invariance techniques

Collision resolution in packet radio networks using rotation...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Ruifeng Zhang N.D. Sidiropoulos M.K. Tsatsanis Dept. of Electr. & Comput. Eng. Stevens Inst. of Technol. Hoboken NJ USA Department of Electrical & Computer Engineering Stevens Institute of Technology Hoboken NJ USA

This paper deals with the multiple medium access problem in the packet radio environment. Under the framework of Network-assisted Diversity Multiple Access (NDMA), a recently proposed multiple access method, rotational invariance and PARAllel FACtor (PARAFAC) analysis signal processing tools are employed for blind collision resolution. The proposed approach (dubbed B-NDMA for Blind NDMA) overcomes the difficulty of orthogonal identification codes required by the original protocol, thereby improving channel utilization and system capacity, while being insensitive to multipath effects and synchronization errors. Performance issues are addressed both analytically and numerically.

关键词： Intelligent networks Packet radio networks Access protocols Multiaccess communication Signal resolution Base stations Signal processing Bit rate Frequency division multiaccess Time division multiple access

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Short-term transmission line maintenance scheduling in a deregulated system

Short-term transmission line maintenance scheduling in a der...

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Power Industry computer Application Conference (PICA)

作者： M.K.C. Marwali S.M. Shahidehpour Dept. of Electr. & Comput. Eng. Illinois Inst. of Technol. Chicago IL USA Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA

In this paper we present a decomposition approach based on duality theory for line maintenance scheduling with transmission and voltage constraints. The given formulation consists of a master program and sub-problems with two independent programs. In the master problem, the maintenance problem is solved and in the subproblems, transmission and voltage problems are solved independently. Since cancelling a transaction or purchasing reactive power relates to the loss of revenue, the trade-off between maintenance cost and revenue loss is be optimized in the proposed method. The test results on the modified IEEE 118-bus system demonstrate that limits on transmission and voltage affect the line maintenance scheduling and increase the maintenance cost. While introducing the loss of revenue as one of the objective functions, the proposed method is flexible enough to accommodate various pricing objectives and methods.

关键词： Transmission lines Voltage Power transmission lines Transmission line theory Constraint theory Reactive power Cost function Optimization methods System testing Pricing

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Novel fuzzy-neural network with general parameter learning applied to sliding mode control systems

Novel fuzzy-neural network with general parameter learning a...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Y. Tamal D. Akhmetov Y. Dote Dept. of Comput. Sci. & Syst. Eng. Muroran Inst. of Technol. Hokkaido Japan Department of Computer Science and Systems Engineering Muroran Institute of Technology Mizumoto Japan

This paper proposes a novel fuzzy-neural network for chattering free sliding mode control. Firstly, soft computing which is the fusion or combination of fuzzy systems, neural networks and genetic algorithms is studied. Then, by taking advantages of fuzzy systems and neural networks a novel fuzzy-neural network with a general parameter learning algorithm and system structure determination is developed. The network is based on a local basis function network. The general parameter method (GP) is based on GMDH (group methods of data handling). The GP is used for a learning algorithm and the structure determination of the developed fuzzy neural network. As the resulting network needs only fuzzy inference computation with GP calculations, which is, generally speaking, the combination of soft and hard computing, called computational intelligence, is suitable to solve nonlinear problems, it especially needs a little computation time. Therefore, it is easy to implement with a HITACHI RISC+DSP microprocessor fast enough for real time operations. The developed signal processor is self-organizing, self-tuning and automated designed. In order to confirm the feasibility of fault diagnosis performance by the developed network, it is applied to chattering free sliding mode control. It is found that the developed method is suitable to other nonlinear control methods.

关键词： computer networks Sliding mode control Genetic programming Fuzzy systems Neural networks Signal processing algorithms Fuzzy neural networks Genetic algorithms Data handling Inference algorithms

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