IEEJ Transactions on Electronics, Information and Systems
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
Volume 121 , Issue 4
Showing 1-19 articles out of 19 articles from the selected issue
  • Akinobu Tanaka, Fei Qian, Hironiri Hirata
    2001 Volume 121 Issue 4 Pages 703-709
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We propose a model of multi-agents with multi-teacher learning automata for cooperative pursuit prob-lems. Each agent must have a communication mechanism to realize cooperative properties. However, since the communication mechanism makes the theoretical analysis of the total system difficult, we make its effects on the completion of the task clear using computer simulation. We show that our method has some efficient properties of pursuing with cooperation.
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  • Noboru Sugio, Yohsuke Kinouchi, Fumio Shirai
    2001 Volume 121 Issue 4 Pages 710-717
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It is very useful to apply a reinforcement learning for controlling a robot hand with tactile sensors which can grasp and manipulate an object delicately like a human hand. A reinforcement learning based on trial and error is proposed here, which is expected to learn autonomously the optimum manipulation from experiences. In computer simulations, the learning algorithm is applied to controlling a simple hand with two fingers and four fingers to investigate its validity . As a result, it has acquired autonomously almost the optimum control for the manipulation of the hand to grasp and convey an object. Therefore, the learning algorithm proposed may be useful basically for controlling a robot hand.
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  • Yoji Taniguchi, Hiroshi Yajima
    2001 Volume 121 Issue 4 Pages 718-725
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In the financial field, the use of customer information analysis systems is important to the customer support section to improve customer service. A customer information analysis system is composed of an analysis system and a storage system. It pays attention to data mining technology that analyses the customer confluence. But when the above technique was applied to actual data, it was found that in some cases, rules that included parity expressions were in the majority. In other cases, most rules were formed from the character of specific demographic clusters.
    A rule generation support method was proposed for deriving useful rules from rules generated by the rule induction method. A prototype of the customer information analysis system was developed using the proposed method. This prototype was applied to actual data from the customer support section of the financial field, and confirmed its usefulness.
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  • Hiroyuki Nakano, Hideo Furuhashi, Toshio Yoshikawa, Akinori Maeda, Yos ...
    2001 Volume 121 Issue 4 Pages 726-732
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The vanadyl-phthalocyanine (VOPc) films were prepared by MBE method on the KBr and quartz substrates. They were treated in organic gas. The film thickness prepared on KBr was 96nm. The morphologies of VOPc films were characterized with the optical absorption spectra of visible and infrared regions (VIS/UV) and SEM image. The second and third hormonic generations (SHG and THG) of VOPc film were also measured by Maker fringe method using a Nd-YAG laser. From results obtained, we concluded that the transition from pseudomorphic epitaxy to epitaxy of VOPc film was caused by the treatment in organic gas and also showed that the nonlinear optical properties of VOPc film were improved by the transition.
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  • Mitsuki Hinosugi, Yoshitaka Tsunekawa, Mamoru Miura
    2001 Volume 121 Issue 4 Pages 733-741
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose the very high-speed redundant binary adder-subtractor without sign changer. Firstly, we consider the subtraction method using redundant binary representation. So we propose the com-putation rule in subtraction. We design the redundant binary subtractor based on that computation rule. Using a hybrid representation method, which attempts to represent each digit by hybrid 2 bits/3 bits, we improve the subtractor at the same delay time as our already proposed high-speed redundant binary adder. Moreover, we develop the adder-subtractor without sign changer. The proposed adder-subtractor is logi-cally compared with the conventional adder-subtractor in terms of gate counts and delay time. Finally, by using PARTHENON, a CAD (Computer Aided Design) system for VLSI, this adder-subtractor is designed and evaluated, based on 5 volt, 0.6μm CMOS process technology. As a result, the speed of the proposed adder-subtractor is about 1.6 times as compared with the conventional adder-subtractor.
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  • Naomichi Sueda, Shigeaki Sakurai, Tsuyoshi Shimada, Yukimitu Touda, Sa ...
    2001 Volume 121 Issue 4 Pages 742-747
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In recent years, image-processing technology has advanced with the progress in digital signal processing and semiconductor technology, etc.. So, image processing technology has been used in the fields of OA, FA, and EA. However, a domain expert must spend a great amount of time applying the technology to his field, because he must understand how to use the software package.
    In order to solve this problem, we developed MMS (Mother Machine System), which generates an opti-mized image processing program by using GA (genetic algorithm). It has been used in many fields, such as in inspection systems for semiconductors, etc.. The conventional MMS needed the input of an outline processing procedure in order to generate a program. To input the outline processing procedure was too difficult for people other than experts in the image processing domain.
    In order to reduce the difficulties further, we improved the system so that past cases and genetic informa-tion could be used. This framework is called CBR (Case-Based Reasoning). In this paper, we show that the system applying CBR can generate image processing program more powerful than the conventional system.
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  • Hayao Miyagi, Josiah L. Munda, Norio Miyagi
    2001 Volume 121 Issue 4 Pages 748-755
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, a generalized Lyapunov function for the Lienard-type nonlinear system which is important as a representative system expressing LRC electric circuits and mechanical spring-mass systems etc., is con-structed using the Lagrange-Charpit method. The Lyapunov function includes particular nonlinear terms as arbitrary functions, by which the quadratic term appearing in the Luré-type Lyapunov function can be extended. The result yields all the conventional Lyapunov functions as special cases, changing the forms of the arbitrary functions. To investigate the relation between the arbitrary function in the Lyapunov function and the stability region obtained, the stability boundaries for various types of the arbitrary functions are illustrated in the application to a simple system. In addition, numerical values of the time derivative of the Lyapunov function along the stability boundary are calculated to study the relation between the stability region and the values of the time derivative.
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  • Miyagi Hayao, Fan Yiping, Yamashita Katsumi
    2001 Volume 121 Issue 4 Pages 756-761
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    An analytic method for solving fuzzy relaion equation has been presented by Sanchez. He has dealt with Max•min composite equation A_??_R=B. The main feature of his method is to define composite operator, i.e., α -composite operator, to derive the maximum values of the solution. Actually, true solution is given by interval values. He has also considered Min•max composite equation AΔR=B for which e -composite operator is defined. The operator can derive the minimum values of interval solution. The characteristic feature of this paper is to exploit such composite operators which can derive whole solutions for Max•min and Min•max composite eqations. The advantage of using these operators is to be able to derive answers elegantly. As the result, _??_ and _??_ composite operators are presented to derive whole interval solutions for Max•min and Min•max composite eqations, respectively. The elegancy appears in the formulation of calculating answer set, evading traditional laborious algorithms for obtaining whole interval solutions.
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  • Kuniaki Kawabata, Tatsuya Ishikawa, Teruo Fujii, Hajime Asama, Isao En ...
    2001 Volume 121 Issue 4 Pages 762-768
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a behavior learning method of a mobile robot using visual information in real environment. View information, which is a characteristic of image, is utilized for input value in proposed method. The input value is a sort compressed data that original image from camera is projected. Proposed system consists of two networks for state expression and behavior generation. State expression network, which is based on self-organizing algorithm, categorizes the robot's states from view information. Therefore, state expression network acquires how to express the state of system in real environment. Also, behavior generation network autonomously acquires the robot's behaviors using output value of state expression net-work. For training behavior generation network, we utilize Actor-Critic method as a sort of unsupervised learning scheme. We report some experimental running results using a mobile robot in real environment. As the result, the mobile robot generates adaptive behaviors utilizing visual information, autonomously.
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  • Kenichi Kubota, Mitsuo Okine
    2001 Volume 121 Issue 4 Pages 769-774
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A current-mode signal processing circuit is quite attractive from low supply voltage operation and high frequency application. A current-mode continuous-time filters consist of simple bipolar current mirrors and capacitors and are quite suitable for monolithic integration.
    In this paper, we proposed a design of multi-port gyrator using current mirror circuits. Using the multi-port gyrator and capacitors, we can simulate the passive LC filters. The tuning of the filter frequency can be achieved by adjusting the current of a single DC current source.
    As examples, third-order and fifth-order lowpass filters are designed for frequencies of 20MHz to 80MHz. SPICE simulation results are shown to demonstrate the effectiveness of the proposed method.
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  • Hiroshi NARITA, Kazuhiko HAMAMOTO
    2001 Volume 121 Issue 4 Pages 775-781
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Recently, increasing the household with older adults, many studies on taking vital signs of older adults in the house automatically have been proceeded. However, the research for taking diagnostic images is not enough in this area. On the other hand, it's known that the ultrasonic diagnosis equipment has various good points for home health care. Although it's expected for the care, it also has weak points. The image resolution is poor and the quality depends on user's skill. In order to overcome these weak points, ultrasonic computed tomography techniques, which used the algorithm of X-ray CT have been proposed. However, the good points of the ultrasonic diagnosis equipment are lost because of CT algorithm.
    The purpose of this study is to develop an ultrasonic imaging system for home health care. The system keeps the good points of ultrasonic equipment. Measure of ultrasonic data to reconstruct image is achieved in a bathtub automatically. The ultrasonic elements are placed on the side of the bathtub. In this method, ultrasonic cone-beam is used. And the signal received at each element is processed by Wiener Filter or Inverse Filter to detect the reflective index. This paper shows the ability of this method by Point Spread Function simulation using the simple back projection method.
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  • Takahiro AKIYAMA, Yutaka MAEDA
    2001 Volume 121 Issue 4 Pages 782-788
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    When independent plural signals are mixed and the mixed plural signals are measured, blind signal sepa-ration technique is very interesting approach to separate these signals only based on the measured signals.
    In this paper, we propose a recursive method to obtain the separating matrix based on the mutual in-formation, via the simultaneous perturbation optimization method. The simultaneous perturbation method updates the separating matrix by using only two values of the mutual information.
    Some examples for audio signals are shown to confirm viability of the proposed method. In these examples, our method separated two original signals from mixed ones properly. This method is applicable to on-line separation because of a simplicity of the algorithm.
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  • Hiroyuki Dekihara, Yasuaki Nakamura
    2001 Volume 121 Issue 4 Pages 789-794
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Abstract: A spatio-temporal data structure, called the MT-PMD tree, is proposed for managing spatio-temporal data with multiple time attributes. The MT-PMD tree is developed by extending the PMD-tree data structure that provides multi-version accesses to spatio-temporal data. The MT-PMD tree can support retrievals based any combination of transaction time interval, valid time interval, and spatial intervals. By simulation tests, the amount of required storage and performances of searches are evaluated for spatio-temporal data with multiple time attributes.
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  • Kiyoshi WADA, Lijuan JIA, Takeshi HANADA, Jun IMAI
    2001 Volume 121 Issue 4 Pages 795-799
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Least squares (LS) method is the most widely used method for the parameter estimation. However when applying directly the LS method to estimate transfer function parameters in the presence of noise, the LS method becomes an asymptotically biased estimator and is unable to be a consistent estimator. There have been many studies to solve the problem of bias and one of them is bias-eliminated least-squares (BELS) method. BELS method is one of consistent estimation methods for unknown parameters of transfer functions. In this paper, we discuss the equivalence of BELS method and IV method under certain condition.
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  • Yutaka Satoh, Shun'ichi Kaneko, Satoru Igarashi
    2001 Volume 121 Issue 4 Pages 800-807
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We propose a new method for robust image registration called ‘Selective Correlation Coefficient (SCC)’ in order to search images under ill-conditioned illumination or partial occlusion. A correlation mask image is generated for selecting pixels of a image before matching. The mask image can be derived from a binary-coded increment sign image defined from any object image and the template image. The masking rate of occluded regions is theoretically expected to be 50%, while un-occluded regions have much lower rate than 50%. We realize robustness under ill-conditioned environment since inconsistent brightness of occluded regions can be omitted by the masking operation. We propose, furthermore, the mask expanding procedure to get more stable robustness. The effectiveness of probabilistic masking increases by the procedure, resulting the rate around 70% of masking of occluded regions. This paper includes a theoretical modeling and analysis of the proposed method and some experimental results with real images.
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  • Wataru Kase
    2001 Volume 121 Issue 4 Pages 808-813
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    An interactor matrix plays several important roles in the control system theory. In this paper, we present a simple method to derive the special interactor matrix using Moore-Penrose pseudoinverse. By the presented method, all zeros of the interactor lie at the origin. Moreover, the interactor by the proposed method has the all-pass property in the discrete-time. A systematic procedure to obtain the identity interactor, which has the arbitrary zeros, is also shown.
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  • Miyagoshi Takashi, Noda Toru, Hatakeyama Toyomasa
    2001 Volume 121 Issue 4 Pages 814-815
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We have analyzed sequence of human T-cell receptor. A histogram showing the numbers of the neighboring base pairs was made. It indicates the following characteristics: (1) the numbers of the same base pair are larger than these of the theoretical values. (2) the numbers of C→G pair are much less than their theoretical values. (3) The sequence holds properties based on the complementarily of them.
    Moreover, we have obtained the theoretical values of the interval in that a given base does not appear, and compared with the actually measured value. We would like to clarify statistical characteristics of the sequence by the information theory approach.
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  • Kozo Taguchi, Masaur Tanaka, Masamichi Tsuda, Masahiro Ikeda
    2001 Volume 121 Issue 4 Pages 816-817
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Tandem optical trapping of micro-spheres was successfully demonstrated by the laser beam emerging from an optical fiber end. We could move this tandem aligned micro-spheres all together for all directions. Fur-thermore, we experimentally investigated the relation between the optically trapped micro-sphere and other micro-spheres dispersed in ethanol in terms of the laser power and the distance between the micro-spheres. From these experimental results, we verified that selective tandem optical trapping of micro-spheres could be obtained.
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  • Teruo Shimomura, Masaki Fujise, Seiichi Serikawa
    2001 Volume 121 Issue 4 Pages 818-819
    Published: April 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A method for measurement of garishness of metallic painted surfaces is proposed in this paper. The light distribution reflected from the surface is captured with a TV camera. To measure the degree of the unevenness of the distribution, the normalized brightness of the distribution is converted into roughness-height. The roughness parameter Ry and Ra which are defined in JIS B0601 are calculated using the roughness-height. As a result, it has been understood that Ry and Ra are highly correlated with the psychological garishness.
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