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1998 International Conference on Communication Technology

作者： Woo-Sug Jung Kwang-Suk Song Hyeong-Ho Lee BoSeob Kwon Processor system Team Electronics and Telecommunication Research Institute 161 Kajong-DongYusung-GuTaejon305-350KOREA Department of Computer Engineering Education Andong National University388 Songchun-dongAndongKyungbuk760-749 KOREA

ISBN: (纸本)7800908275

In this paper,we describe a novel duplicated fault tolerance control module using concurrent-write for ATM switching *** implement a fault tolerance control module,we expand to a bus between main memory and memory controller that we called memory bus. We devise a special kind of switch to implement it. In our approach,the memory is consists of CWM (Concurrent-Write Memory) and NCM(Non Concurrent-write memory).The memory controller is always accessible to NCM but is impossible to access a self-CWM in standby *** duplicated operating mode,a memory controller of active module has a responsibility for refresh cycle of standby memory as well as self-side *** it happens a write transaction to memory,it naturally reflects an other-side memory with simultaneous by concurrent-write channel as well as a selfmemory. This control module can widely apply to commercial system,which require a cost-effective fault tolerance control module.

关键词： A cost-effective fault-tolerance control modules using concurrent write method for ATM switching system ATM

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Nonlinear behavior of electromagnetic waves in the YIG film microstrip line

Nonlinear behavior of electromagnetic waves in the YIG film ...

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Microwave, MTT-S International Symposium

作者： M. Tsutsurni T. Ueda K. Okubo Dept. of Electron. & Inf. Sci. Kyoto Inst. of Technol. Japan Department of Electronics and Information Science Kyoto Institute of Technology Matsugasaki Kyoto Japan Faculty of Computer Science and System Engineering Okayama Prefectural University Okayama Japan

The limiter and microwave soliton behavior were experimentally demonstrated in the microstrip line using the 20 /spl mu/m thick yttrium iron garnet film substrate at S band. These nonlinear phenomena were explained by the strong coupling between quasi-TEM and magnetostatic forward volume wave modes at magnetic resonance frequency of /spl gamma//spl mu//sub 0/H/sub 0//2/spl pi/ from an implicit dispersion relation of the stripline.

关键词： Electromagnetic scattering Magnetic resonance Magnetic films Solitons Microstrip Yttrium Iron Garnet films Substrates Couplings

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An upper bound on bit error rate for concatenated convolutional code

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IEICE TRANSACTIONS ON FUNDAMENTALS OF electronics COMMUNICATIONS AND computer SCIENCES 1997年第11期E80A卷 2123-2129页

作者： Wadayama, T Wakasugi, K Kasahara, M Faculty of Computer Science and System Engineering Okayama Prefectural University Soja-shi 719-11 Japan Department of Electronics and Information Science Kyoto Institute of Technology Kyoto-shi 606 Japan

This paper presents a new upper bound on overall bit error rate (BER) for a concatenated code which consists of an inner convolutional code and an outer interleaved Reed-Solomon code. The upper bound on BER is derived based on a lower bound on the effective minimum distance of the concatenated code. This upper bound can be used for the cases when the interleaver size is small such that the conventional upper bound is not applicable.

关键词： concatenated code convolutional code interleave Reed-Solomon code burst correction

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Video On Demand system For Interactive Multimedia Services

Video On Demand System For Interactive Multimedia Services

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IEEE International Conference on Consumer electronics (ICCE)

作者： Jun Jae Yoo Chang Woo Jee Sun Hun Jung Hyung Su Lee Sung Han Park System Research Team Korea Electronics and Technology Institute South Korea Department of Computer Science & Engineering Hanyang University South Korea

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Cascade-CMAC neural network applications on the color scanner to printer calibration

Cascade-CMAC neural network applications on the color scanne...

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International Conference on Neural Networks

作者： King-Lung Huang Shu-Cheng Hsieh Hsin-Chia Fu Opto-Electronics and System Laboratories Industrial Technology and Research Institute Department of Computer Science & Information Engineering National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)0780341228

This paper presents an application of using a cascade-CMAC (cerebellar model articulation controller) neural network to solve some color calibration problems, which include color differences induced from gamuts mis-match and the nonlinear transformation characteristics between color scanning input devices and color printing output devices. For this purpose, we proposed a scalable learning architecture "cascade-CMAC" to implement an adaptive color calibration system. By analyzing the preliminary learning situation, the scalable architecture can dynamically create a new learning unit to better represent a finer color resolution, so that the learning capacity as well as the color details of the system can be greatly improved. From the experimental results, the proposed cascade-CMAC architecture can improve the rate of convergence and also can adjust the learning architecture effectively. The learning speed can be 2/spl sim/4 times faster than the conventional CMAC. The effectiveness of this neural network has been tested by observing the differences between the calibrated and the un-calibrated output on a number of known samples. By using the Macbeth color-checker which contains 24 color patches as benchmark, the average color differences between the original and the calibrated print-out is improved from 15 /spl Delta/E/sub ab/ to 8 /spl Delta/E/sub ab/ under the 3 /spl Delta/E/sub ab/ convergent criterion for training. The calibration performance is somewhat significant.

关键词： Neural networks Printers Calibration Application software Color Laboratories computer industry Electrical equipment industry computer science Printing

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Digital Adaptive Motion Control for a Servo Mechanism

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IFAC Proceedings Volumes 1997年第11期30卷 323-328页

作者： T. Suehiro F. Ohkawa T. Hokamura S. Sagara Electronics Division Mechanics & Electronics Research Institute Fukuoka Industrial Technology Center 3-6-1 Norimatsu. Yahatanishi-ku Kitakyushu-shi 807 Japan Department of Control Engineering and Science Faculty of Computer & System Engineering Kyushu Institute of Technology lizuka 820 Japan Department of Control Engineering Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804 Japan

This paper is concerned with an application of a digital adaptive control system to a servo mechanism. Mechanical systems in general include nonlinearities and additional uncertainties and which result from inertia and friction. So it is difficult to ensure robust performance and high accuracy for motion control. The digital adaptive control system presented here is considered to overcome the above stated problem. Experimental results from a feed drive system demonstrate the effectiveness of the proposed control scheme.

关键词： Adaptive Control Servomechanism Nonlinearity Uncertainty Friction

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Recovery in a shared disk parallel database system using DFeRAM

Recovery in a shared disk parallel database system using DFe...

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International Conference on High Performance Computing in the Asia-Pacific Region

作者： Yong Keol Kim Young Sik Baek Seong II Jin Sung Hyun Cho Department of Office Automation Taejon Medical Junior College South Korea System Technology Section Electronics and Telecommunications Research Institute South Korea Department of Computer Science Chungnam National University South Korea Division of Electronics and Computer Engineering Hongik University South Korea

A nonvolatile memory called FeRAM (Ferroelectronic Random Access Memory) is one of the promising memory devices. This paper presents a dual plane FeRAM (DFeRAM) architecture for recovery in the shared disk parallel database system. This paper also presents a recovery algorithm based on a shadow paging method using a DFeRAM architecture. We compare the performance of the log based method and that of our method based on simulation results, which show that our method is better than the log based method when both methods use a nonvolatile memory.

关键词： Database systems Nonvolatile memory Random access memory Ferroelectric films Transaction databases Object oriented modeling Maintenance Discrete event simulation Communication system control Flash memory

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Localized Excitons in InGaN

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MRS Online Proceedings Library 1997年第1期482卷 648-659页

作者： S. Cmchibu T. Deguchi T. Sota K. Wada S. Nakamura Materials Department University of California Santa Barbara USA Faculty of Science and Technology Science University of Tokyo Chiba 278 Japan Department of Electrical Electronics and Computer Engineering Waseda University Tokyo 169 Japan Compound Semiconductor Materials Research NTT System Electronics Laboratories Kanagawa Japan Department of Research and Development Nichia Chemical Industries Ltd. Tokushima 774 Japan

Emission mechanisms of the device-quality quantum well (QW) structure and bulk three dimensional (3D) InGaN materials grown on sapphire substrates without any epitaxial lateral overgrown GaN (ELOG) base layers were investigated. The InxGx1−xN layers showed various degree of spatial potential (bandgap) fluctuation, which is probably due to a compositional inhomogeneity or monolayer thickness fluctuation produced by some kinetic driving forces initiated by the threading dislocations (TDs) or growth steps during the growth. The degree of fluctuation changed remarkably around nominal InN molar fraction x=0.2, which changes to nearly 8–10 % for the strained InxGa1−xN. This potential fluctuation induces energy tail states both in QW and 3D InGaN, showing a large Stokes-like shift combined with the red shift due to quantum confined Stark effect (QCSE) induced by the piezoelectric field. The spontaneous emission from undoped InGaN single quantum well (SQW) light-emitting diodes (LED’s), undoped 3D double heterostructure (DH) LED’s, and multiple quantum well (MQW) laser diode (LD) wafers was assigned as being due to the recombination of excitons localized at the potential minima, whose area was determined by cathodoluminescence (CL) mapping to vary from less than 60 nm to 300 nm in lateral size in the case of QW’s. The lasing mechanisms of the cw In0.15Gao.85N MQW LD’s having small potential fluctuation, whose bandgap broadenings are less than about 50 meV, can be described by the well-known electron-hole-plasma (EIHP) picture with Coulomb enhancement. The inhomogenous MQW LD’s are considered to lase by EHP in segmented QW’s or Q-disks. It is desirable to use entire QW planes with small potential inhomogeneity as gain media for higher performance LD operation.

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An importance sampling for the coded satellite systems with memory

An importance sampling for the coded satellite systems with ...

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IEEE International Conference on Communications (ICC)

作者： Sung-Chan Ko Junghwan Kim Jae-Moung Kim Ji Won Jung Department of Information and Communication National An Dong University Gyeongsangbuk South Korea Department of Electrical Engineering and Computer Sciense University of Tolctlo and Eötvös Lárand University Toledo OH USA Satellite Communications System Division Electronics and Telecommunications Research Institute Taejon South Korea Department of Radio Science and Engineering Korea Maritime University busan South Korea

ISBN: (纸本)0780339258

For the estimation of average bit error rate (BER) of complex digital communication systems, Monte-Carlo (MC) simulation technique has been widely used because of its simplicity. However, it requires excessively long execution time to estimate lower BER. Although this time can substantially be reduced by using importance sampling (IS), IS has not been quite successful in the simulation of practical nonlinear satellite communication systems that typically consist of memory components and forward error correction (FEC) scheme. In this paper, we propose a new algorithm for the simulation of Viterbi decoder using sequentially implemented IS. We then combine it with the efficient importance sampling (EIS) technique to resolve the problems associated with memory. Results from this integration exhibit dramatic reduction of simulation time. Principles of the new simulation method of Viterbi decoding are presented. Details on the integration with EIS are followed with some numerical examples.

关键词： Monte Carlo methods Decoding Bit error rate Viterbi algorithm Computational modeling Satellite communication Forward error correction Discrete event simulation Convolutional codes Digital communication

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Matched design method for concatenated trellis-coded modulation

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IEICE TRANSACTIONS ON FUNDAMENTALS OF electronics COMMUNICATIONS AND computer SCIENCES 1996年第11期E79A卷 1911-1917页

A new design method, which is referred to as the matched design method, for concatenated trellis-coded modulation (TCM) is presented. Most of the conventional concatenated TCM employs TCM designed to maximize the minimum squared Euclidean free distance, d(free)(2). With the matched design method, we maximize d(1)(2)(t) instead of d(free)(2), where d(1)(2)(t) is the effective minimum squared Euclidean distance (MSED) when the outer code has a t-error correcting capability. The effective MSED is derived from the Euclidean/Hamming (E/H) joint weight distribution of terminated TCM. We here assume the concatenated TCM whose transmitted symbol corresponds to a symbol of outer code. The new classes of 2-dimensional(2D) and 4-dimensional(4D) codes are found by a computer search. Under the performance measures of the effective MSED or the effective multiplicity, these codes are superior to the conventional codes such as the Ungerboeck's 2D-codes when those are used as an inner code. We disclose an interesting fact that the new class of codes using rate-1/2 encoder is superior to the class of codes using rate-2/3 encoder. This fact implies that the codes using rate-1/2 encoder have two advantages: 1) better overall decoding performance and 2) less decoding complexity.

关键词： trellis-coded modulation concatenated code weight distribution

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