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Effectiveness of resistive boundary conditions for plane gratings

Electronics and Communications in Japan (Part II: Electronics) 1998年第12期80卷

作者： Hideaki Wakabayashi Jiro Yamakita Keiji Matsumoto Masamitsu Asai Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Japan 719-1197 Faculty of Engineering Osaka Sangyo University Daito Japan 574-8530 Faculty of Biology-Oriented Science and Technology Kinki University Wakayama Japan 649-6493

The spectral Galerkin procedure is often used to analyze scattering by metallic gratings. The resistive boundary condition is applied to metallic gratings that are assumed to be zero-thickness plane gratings. However, it is difficult to simulate plane gratings without knowing the limits of thickness in the application of such boundary conditions. In this report, the relations between a plane metallic grating and a thin dielectric grating with complex permittivity are investigated by using the conventional method for dielectric gratings. From numerical results, the effectiveness of resistive boundary conditions is discussed. © 1998 Scripta Technica. Electron Comm Jpn Pt 2, 80(12): 7–17, 1997

关键词： resistive boundary condition plane grating dielectric grating spectral Galerkin procedure

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Primary structures of sperm-specific basic nuclear proteins and gene expression in Japanese newt, Cynops pyrrhogaster

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Molecular Reproduction and Development 1998年第3期46卷

作者： Kumiko Yoshinobu Toshihiro Kondo Masayuki Takai Chiaki Katagiri Hiroyuki Tou Shin-Ichi Abe Kazufumi Takamune Gene Technology Center Kumamoto University Kumamoto Japan Department of Biological Science Faculty of Science Kumamoto University Kumamoto Japan Central Laboratory for Medical Study and Research Equipment Saga Medical School Saga Japan Biological Laboratory Saga Medical School Saga Japan Division of Biological Science Graduate School of Science Hokkaido University Sapporo Japan Department of Biochemical Engineering and Science Faculty of Computer Science and System Engineering Kyusyu Institute of Technology Iizuka Japan

Electrophoretic analyses of acid extracts from mature sperm of newt, Cynops pyrrhogaster, on acid/urea/Triton X-100 polyacrylamide gel showed the exclusive occurrence of sperm-specific nuclear basic proteins (SBPs), which moved faster than somatic histones on the gel. These SBPs were eluted separately by reversed phase-high-performance liquid chromatography as two large peaks and a few small peaks. Of these, only the small peaks disappeared with treatment of the acid extracts with alkaline phosphatase before they were injected into the column, so that there were only two distinct components: NP1 and NP2. Determination of amino acid sequences by the Edman method as well as by sequencing of cDNA for both components indicated that each protein consisted of 43 (NP1) or 48 (NP2) amino acid residues, rich in arginine residues (53.5% in NP1; 47.9% in NP2), forming the clusters. They had molecular masses of 5,386 Da (NP1) and 5,748 Da (NP2), respectively. Northern blot analysis using cDNAs as probes indicated that mRNAs for both NP1 and NP2 occurred not in primary spermatocytes but in round spermatids. In situ hybridization analyses using antisense RNA for NP1 as a probe clearly showed the first appearance of NP1 mRNA at the late stage of round spermatid. Mol. Reprod. Dev. 46:243–251, 1997. © 1997 Wiley-Liss, Inc.

关键词： protamine spermatogenesis testis amphibian

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Associative memories in cellular neural networks using a singular value decomposition

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC science 1997年第1期80卷 59-68页

作者： Kawabata, H Zhang, Z Kanagawa, A Takahashi, H Kuwaki, H Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Japan 719-11 Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Japan 719-11 Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Japan 719-11 Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Japan 719-11 Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Japan 719-11

Using various templates, many applications of cellular neural network (CNN), such as a feature extraction, an edge detection and a pattern classification have been considered. In a Hopfield network, an image to be stored corresponds to the minimum value of the energy of the network. However, in CNN, an image corresponds to the equilibrium state of a differential equation. A synthesis procedure for designing a CNN that will store a set of desired vectors as memory points using a singular value matrix decomposition is considered. Also analyzed here is the indeterminate phenomenon of the equilibrium states of some cells that arise in the case in which more than two similar patterns are stored for Chinese characters.

关键词： cellular neural network template matrix associative memory singular value decomposition

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Multimode optical fiber demultiplexer-star coupler using a single gradient-index-rod lens and a multi-facet grating

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OPTICAL REVIEW 1997年第1A期4卷 80-84页

作者： Fukushima, T Sakamoto, T Department of System Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719–11 Japan

An optical fiber multi-function device consisting of a single gradient-index-rod lens and a multi-facet blazed reflection grating is proposed to simultaneously realize functions of wavelength demultiplexing and optical signal distribution in a multimode optical fiber transmission system. We analyzed the demultiplexing characteristics and the tolerance of optical components using the ray trace method. This device can realize not only low loss optical signal distribution but also offers improved demultiplexing characteristics in comparison with the previously proposed demultiplexer-multiposition switch. The following characteristics are expected from the design using commercially available optical components: a working band of 0.64-0.88 mu m, channel separation of 34-36 nm, 3 dB bandwidth of 27-28 nm, channel cross-talk of less than -40 dB and minimum excess insertion loss of 0.9-2.1 dB.

关键词： wavelength division multiplexing wavelength demultiplexer optical signal distribution multifunction device optical fiber array gradient-index-rod lens multi-facet grating

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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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Optical signal inverter using injection locking of coupled semiconductor lasers

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 1997年第3A期36卷 L280-L282页

作者： Fukushima, T Sakamoto, T Department of System Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-11 Japan

We propose and demonstrate a unique optical signal inverter using injection locking in coupled semiconductor lasers with a narrow-band Fabry-Perot (F-P) etalon. In this method, one laser diode is operated as a master laser to control the injection locking and the other is operated as a slave laser. By setting of the F-P etalon inside the coupled cavity, the locking and unlocking states can be allocated to the lon and high levels for the output power respectively. Under direct modulation of the master laser, the inverted light signal is available from the output port. This optical inverter can be operated at an output power of similar to 7 mW.

关键词： optical signal inverter injection locking semiconductor laser Fabry-Perot etalon coupled cavity direct modulation

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A class of trellis-codes for partial response channel

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND computer scienceS 1997年第2期E80A卷 386-392页

作者： Wadayama, T Nagao, A Wakasugi, K Kasahara, M Faculty of Computer Science and System Engineering Okayama Prefectural University Soja-shi 719-11 Japan

We present a new class of trellis-codes for partial-response channel. Our code configuration is based on the coded 1 - D scheme due to Wolf rind Ungerboeck. However, no precoder between a convolutional encoder and the partial-response channel is used. A new lower bound on the minimum free squared Euclidean distance of channel code is shown. The bound is available for any PR channel with a finite response New codes for 1 - D and (1 - D)(1 + D)(2) channels are found by computer code starch using the lower bound. Some of the new codes have excellent properties: a significant d(free)(2) and a small decoding complexity.

关键词： trellis-code partial-response channel

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Magnetostatic wave soliton in the microstrip line with YIG film substrate

Magnetostatic wave soliton in the microstrip line with YIG f...

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Asia-Pacific Conference on Microwave

作者： K. Okubo M. Tsutsumi Faculty of Computer Science and System Engineering Okayama Prefectural University Okayama Japan

In this paper, the envelope soliton behavior of a magnetostatic forward volume wave propagating in a microstrip line with a YIG film substrate is discussed both experimentally and theoretically from a point of view of generation of short microwave pulse. Experiments are carried out at around a frequency of 3 GHz. It is observed that input pulse signal of 35 ns duration is compressed into 10 ns by soliton. To explain the soliton properties, simulations are carried out using the split step Fourier transform method. It is shown theoretically that observed pulse compression characteristics are caused by the nonlinear effect of the permeability in the YIG film, and that a non-uniform DC bias magnetic field is effective in reducing attenuation and to observe the compressed pulse. These results can be useful for microwave pulse compression devices or generating a microwave short pulse.

关键词： Magnetostatic waves Solitons Microstrip Pulse compression methods Microwave generation Pulse generation Microwave devices Microwave propagation Substrates Frequency

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Hidden-layer size reducing for multilayer neural networks using the orthogonal least-squares method

Hidden-layer size reducing for multilayer neural networks us...

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SICE Annual Conference

作者： Zi-Jiang Yang Faculty of Computer Engineering and System Science Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)0780342089

This paper proposes a new approach to hidden-layer size reducing for multilayer neural networks, using the orthogonal least-squares (OLS) method based on the Gram-Schmidt orthogonal transformation. A neural network with a large hidden-layer size is first trained via a standard training rule. Then the OLS method is introduced to identify and eliminate redundant neurons such that a simpler neural network is obtained. The OLS method is employed as a forward regression procedure to select a suitable set of neurons from a large set of preliminarily trained hidden neurons, such that the input to the output-layer neuron is reconstructed with less hidden neurons. Simulation results are included to show the efficiency of the proposed method.

关键词： Multi-layer neural network Neural networks Neurons Redundancy Training data computer networks systems engineering and theory Paper technology Backpropagation Pattern classification

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Sequential self-reorganization method of symptom parameters and identification method of membership function for fuzzy diagnosis

Sequential self-reorganization method of symptom parameters ...

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： P. Chen M. Nasu T. Toyota Faculty of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan

When building up a fuzzy diagnosis system, symptom parameters (SPs) must be extracted and the membership functions between the symptom parameters and failure categories must be defined for fuzzy inference. Currently, however, there is no acceptable method for extracting the optimum SP by which the failure types can be sensitively distinguished. In order to overcome this difficulty and ensure highly accurate failure diagnosis, in this paper, a new method called "sequential self-reorganization of symptom parameters" is proposed by using genetic algorithms (GA). Also the identification method of membership functions of symptom parameters is discussed by using the possibility theory. The efficiency of these methods is verified by applying them to a ball bearing diagnosis system. The new methods proposed here can also be applied to other pattern recognition problems.

关键词： Pattern recognition Possibility theory Ball bearings Fuzzy systems computer science systems engineering and theory Signal resolution Genetic algorithms Probability density function Rotating machines

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