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A parallel analog intelligent vision sensor with a variable receptive field

systems and computers in Japan 1999年第1期30卷 60-69页

作者： Yagi, Tetsuya Kameda, Seiji Iizuka, Kunihiko Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka 820-8502 Japan Advanced Technology Research Laboratories Sharp Tenri 632-0004 Japan Institute of Physiological Science Okazaki Japan Nagoya Institute of Technology Japan Institute of Electronics Information and Communication Engineers Japan Society of Instrument and Control Engineers Japan Japanese Neural Network Society Japan Association for Research in Vision and Opthalmology Japan Kyushu Institute of Technology Japan Advanced Technology Research Laboratories Tenri Japan

The retina is an intelligent vision sensor indispensable in real-time image information processing of animals. The parallel image processing function of the retina was realized in an analog CMOS integrated circuit (vision chip). The chip was implemented with a one-dimensional Laplacian-Gaussian receptive field the size of which can be controlled by external signals. Active pixel sensors were used in the sensor part of the chip where the light sensitivity can be controlled by varying the accumulation time. Circuits compensating for noise due to the mismatch of transistor characteristics were incorporated, and the experimental results verified that sufficiently accurate outputs can be obtained under natural illumination. The chip can effectively extract the spatial frequency bandwidth of the signal in the presence of noise. © 1999 Scripta Technica.

关键词： Analog VLSI Laplacian-Gaussian Offset compensation Parallel processing Variable receptive field Vision chip

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Smart telephone design-caller identification and answering machine

Smart telephone design-caller identification and answering m...

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IEEE International Conference on Semiconductor Electronics (ICSE)

作者： M.M. Hasan Lim Hooi Jiun Ng Wei Cheun M.S. Shahid Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

This paper presents some advanced facilities and services related to the use of everyday telephones. The caller identification and answering machine are advanced telephone functions. The telephone system can be used as a tele-security system. This research work is based on the potential use of a low cost 8-bit microcontroller. The caller identification (caller ID) system is a feature of digital telephone networks and is supported by signaling system no. 7 (SS7) which uses a separate call data circuit. The caller ID information is transmitted on the subscriber loop using frequency shift key (FSK) modem tones and data is embedded between the first and second ring of the ringing signal. A caller ID decoding circuit has been designed for decoding the FSK modem tone and the appropriate ASCII code is displayed in the LCD unit. An answering machine is a device that answers the telephone calls in the absence of the called party and records the incoming message into a cassette. A ring detector circuit, outgoing message (OGM) sender circuit, tape driver circuit, dual tone multiplexed frequency (DTMF) encoder circuit and calling party control (CPC) circuit have been developed for the answering machine device. The DTMF generator circuit and sensor signal management circuit have been integrated to provide a tele-security system. A PIC 16C84 (8-bit microcontroller) controls all logic operations as it was programmed. Software has been produced in assembly language for programming of the microcontroller.

关键词： Telephony Circuits Frequency shift keying Microcontrollers Modems Decoding Costs communication system signaling Subscriber loops Frequency locked loops

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Handling KDD process iteration by integration of planning and controlling

Handling KDD process iteration by integration of planning an...

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IEEE International Conference on systems, Man and Cybernetics

作者： Chunnian Liu Ning Zhong Department of Computer Science Beijing Polytechnic University Beijing China Department of Computer Science and System Engineering Faculty of Engineering Yamaguchi University Ube Japan

ISBN: (纸本)0780347781

In our GLS (global learning scheme) system, KDD (knowledge discovery in databases) process is modeled as an organized society of intelligent agents (called KDD agents). KDD process planning is a meta-agent in this framework, and some basic AI planning techniques have been used to organize dynamically the KDD process so that the GLS system increases both autonomy and versatility. In this paper, we address some deeper issues concerning KDD process planning. Especially we propose a mechanism integrating process planning with process controlling to formalize process iteration (that is, the re-execution of some agents). In this mode, execution failures causing process iteration, feedback paths and re-execution of the agents in the paths (and even the iterating number for each loop) are determined dynamically and automatically. With this and other deeper issues (such as process evolution) being properly handled, the GLS system is more complete in KDD process modeling, and more flexible and robust for practical use.

关键词： Process planning Automatic control Control systems Intelligent agent Process control Artificial intelligence Production systems Databases Feedback loop Robustness

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Exciton localization in InGaN quantum well devices

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Journal of Vacuum science & Technology B: Microelectronics Processing and Phenomena 1998年第4期16卷 2204-2204页

作者： Chichibu, Shigefusa Sota, Takayuki Wada, Kazumi Nakamura, Shuji Materials Department University of California Santa Barbara California 93106 Faculty of Science and Technology Science University of Tokyo Noda Chiba 278-8510 Japan Department of Electrical Electronics and Computer Engineering Waseda University Shinjuku Tokyo 169-8555 Japan Compound Semiconductor Materials Research NTT System Electronics Laboratories Atsugi Kanagawa 243-0198 Japan Department of Research and Development Nichia Chemical Industries Limited Kaminaka Anan Tokushima 774-8601 Japan

Emission mechanisms of a device-quality quantum well (QW) structure and bulk three dimensional (3D) InGaN materials grown on sapphire substrates without any epitaxial lateral overgrown GaN base layers were investigated. The InxGa1−xN layers showed various degrees of in-plane spatial potential (band gap) inhomogeneity, which is due to a compositional fluctuation or a few monolayers thickness fluctuation. The degree of fluctuation changed remarkably around a nominal InN molar fraction x=0.2, which changes to nearly 0.08–0.1 for the strained InxGa1−xN. This potential fluctuation induces localized energy states both in the QW and 3D InGaN, showing a large Stokes-like shift. The spontaneous emission from undoped InGaN single QW light-emitting diodes (LEDs), undoped 3D LEDs, and multiple QW (MQW) laser diode (LD) wafers was assigned as being due to the recombination of excitons localized at the potential minima, whose lateral size was determined by cathodoluminescence mapping to vary from less than 60 to 300 nm in QWs. Those structures are referred to as quantum disks (Q disks) or segmented QWs depending on the lateral size. Blueshift of the emission peak by an increase of the driving current was explained to be combined effects of band filling of the localized states by excitons and Coulomb screening of the quantum confined Stark effect induced by the piezoelectric field. The lasing mechanisms of the continuous wave In0.15Ga0.85N MQW LDs having small potential fluctuations can be described by the well-known electron-hole-plasma (EHP) picture. However, the inhomogeneous MQW LDs are considered to lase by EHP in segmented QWs 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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Derivation of invariant features using scale factors from a neural network

Derivation of invariant features using scale factors from a ...

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International Joint Conference on Neural Networks (IJCNN)

作者： P. Raveendran S. Omatu Poh Sin Chew Engineering Faculty Universiti Malaya Kuala Lumpur Malaysia Department of Computer and System Science College of Engineering University of Osaka Salai Osaka Japan

Conventional regular moments are only invariant to translation, rotation and equal scaling. It is shown that the conventional regular moment-invariants remain no longer invariant when the image is scaled unequally in the x- and y-directions. The paper addresses this problem by presenting a technique to make the moments invariant to unequal scaling. Consequently, we would be able to obtain features for images that are translated, scaled equally/unequally and rotated. The problem is formulated using conventional regular moments. A neural network is trained to estimate the reference scale factor and together with another computed factor obtained from an equation involving the angle of rotation, the scaling ratio for the particular images can be obtained. From this, moments can be made invariant to unequal scaling. Invariance of rotation is achieved by using the principle axis method to determine the angle of rotation and consequently the moments of the image can be derived in its unrotated form. Validity of this method is demonstrated by experiment.

关键词： Neural networks Layout Pattern recognition Image recognition Silicon compounds Equations Pattern matching Pattern analysis Reflection Marine vehicles

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Agents based approach for QoS adaptation in distributed multimedia applications over ATM networks

Agents based approach for QoS adaptation in distributed mult...

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IEEE International Conference on ATM

作者： F. Nait-Abdesselam N. Agoulmine A. Kasiolas Advanced Communication Engineering Center Department of Electrical and Computer Engineering The Faculty of Engineering Science University of Western Ontario London ONT Canada PRiSM Laboratory University of Versailles Versailles France

Multimedia communications have evolved rapidly during the last few years and they now require communication services with guaranteed quality of service (QoS). For the type of these new distributed multimedia applications, it is crucial to monitor continuously the current QoS parameters of a connection to ensure that they comply with the pre-arranged negotiated values. The method proposed in this paper suggests the use of QoS monitoring agents in the ATM switches as well as in the end systems, in a way that allows automatic recovery, if possible, from all the QoS violations. The recovery will be achieved by redistributing the levels of QoS that should be supported immediately by a component to meet the end-to-end requirements. An initial architecture is proposed as well as the communication protocol between the agents and future directions are given.

关键词： Intelligent networks Quality of service Asynchronous transfer mode Switches Multimedia systems Video on demand Application software Pulse width modulation Multimedia communication Streaming media

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End-to-end QoS architecture for continuous media services

End-to-end QoS architecture for continuous media services

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International Workshop on Database and Expert systems Applications

作者： K. Hashimoto J. Sato Y. Kohsaka Y. Shibata N. Shiratori Faculty of Software and Information Science Iwate Prefectural University Iwate Japan Department of Information and Computer Science Faculty of Engineering Toyo University Kawagoe Saitama Japan Research Institute of Electrical Communication University of Tohoku Sendai Japan

In order to realize multimedia applications such as VOD (Video-on-Demand) over highspeed networks, suitable QoS (Quality of Service) of the continuous media such as audio and video have to be guaranteed in accordance with users' requirements, available computing and network resources during the service session. In this paper, we introduce the Media Coordinate system which provides end-to-end QoS guarantee and negotiation functions consistently from the application through network layers. Within these QoS control functions we introduce a packet rate control method to reduce the packet loss, and a frame rate control method to maintain the frame rate at a constant under the dynamic load conditions. We implemented the media coordinate system as a prototyped Video-on-Demand system and evaluated the performance of these control functions. Through these performance evaluations, we could justify the usefulness of our suggested media coordinate system.

关键词： Streaming media Control systems Resource management Physical layer

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Motion simulation of virtual varicolored carp based on the vibration wing theory

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Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers 1998年第9期52卷 1374-1374页

作者： Manabe, Takahide Harima, Toshio Anzai, Yuichi Chiba, Norishige Saito, Nobuji Ricoh System Development Inc. Totuka-ku Yokohama-shi 244-0817 292 Yoshida-cho Japan Department of Communication Engineering Tohoku Institute of Technology Taihaku-ku Sendai-shi 982-0831 35-l Yagiyama Kasumi-cho Japan Department of Computer Science Faculty of Engineering Iwate University Morioka-shi 020-0066 4-3-5 Ueda Japan

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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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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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