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Volume 114, Issue 5
Displaying 1-16 of 16 articles from this issue
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Katsuo Aizawa1994 Volume 114 Issue 5 Pages 507
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Yukihiro Ozaki1994 Volume 114 Issue 5 Pages 508-514
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Aritake Mizuno1994 Volume 114 Issue 5 Pages 515-521
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Tsunenori Arai1994 Volume 114 Issue 5 Pages 522-528
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Katsuhiko Sato, Shinichi Fujisaka1994 Volume 114 Issue 5 Pages 529-534
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Takeshi Takemura1994 Volume 114 Issue 5 Pages 535-541
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Tetsuya Okunaka, Katsuo Aizawa1994 Volume 114 Issue 5 Pages 542-545
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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Satoshi Ichikawa, Hiroya Tsuji1994 Volume 114 Issue 5 Pages 546-552
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper presents a method to analyze the electric circuit composed of linear subcircuit and nonlinear resistors, inductors capacitors and periodically excited sources. The method uses the generalized power series expansion formulas for nonlinear elements. Harmonic balance type nonlinear equation in the complex frequency domain to determine the steady state response has been obtained by the multinomial expansion theorem up to now. But the process to get the equation is very complicated and cumbersome, so we propose a new method based on the nonlinear steady state response method. This method is suited to the analysis of nonlinear circuit with multi-frequency excitation of arbitrary frequency separation.
Practical computer algorithm is presented and validity of the method is shown by illustrative examples.View full abstractDownload PDF (1219K) -
Hiromitsu Shiraki1994 Volume 114 Issue 5 Pages 553-560
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA current amplifing image sensor with buried driving electrodes, was proposed to increse photo-sensitivity and dynamic range. The proposed structure allows to remove all electrodes from photo-electric conversion region surface except for vertical signal line and includes thick conversion area and high impurity concentration storage region. Then, high photo-sensitivity and wide dynamic range are anticipated. Mode selection is carried out from the buried driving electrodes.
Readout signal amplitude is determined by the amount of signal charge stored in each photodiode. The operation and performace of the structure were simulated for a device of 1, 000×1, 000 cells/cm2. The simulation indicated that number of noise eqivalent signal charge, which is decided by the linear region drain conductance at readout time, is 170 holes/cell and that dynamic range is 60 dBs'.View full abstractDownload PDF (1741K) -
Toshihiro Nishimura, Takeshi Inoue, Tetsuji Eguchi, Masao Saito1994 Volume 114 Issue 5 Pages 561-568
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSSince treatment at present does not consider the circadian variation of blood pressure in patients, adverse reactions such as over reduction of blood pressure by drug administration and the harm not to reduce blood pressure still remain. There are few researches to analyze quantitatively by employing a mathematical model. It is important that a mathematical model is contracted to treat hypertension quantitatively. In this paper, the submodel for endocrine system is proposed employing biochemical substances which regulate mean blood pressure. The submodel for autonomic nervous system is proposed. And a model for mean blood pressure is proposed employing the submodel for endocrine system and the submodel for autonomic nervous system. The method that decides the parameters in the model for mean blood pressure was discussed. The circadian variation of heart rate and mean blood pressure was estimated using the presented model. Absolute error between estimated results and measured results was discussed.View full abstractDownload PDF (1433K) -
Xiaomang Zhang, Keiji Taniguchi, Rokuro Matsubara1994 Volume 114 Issue 5 Pages 569-578
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper presents a method for extracting the pigmented nerve cell bodies from their background. The proposed method is based on the four concepts: semithreshold, scissor-cut technique, precision processing and processing criterion. An empirical formula is introduced to semithreshold the original ima_??_e. The remaining background existing in the semithresholded image can be deleted by using both the scissor-cut technique and the precision processing. The scissor-cut technique used here can separate two or more tightly adjacent cell bodies from each other and extract them properly. This technique also can be used to cut out the undesired spots around the cell bodies. The precision processing is used to extract the cell bodies delicately. Our motivation comes from practical applications, where the traditional method, i.e., the mode method, can not always give good segmented results. The processed procedure is supervised under the processing criterion and this can guarantee to give a reasonable result under the sense of the dynamic threshold value. The proposed method performed very well through practical test.View full abstractDownload PDF (6471K) -
Yoshitaka Maekawa, Mitsuo Tamura, Isao Nakayama, Yasuhiko Yoshinari, H ...1994 Volume 114 Issue 5 Pages 579-587
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper proposes a parallel processing scheme of electronic circuit simulation using direct method and evaluates performance of the scheme on a multiprocessor system. A special purpose compiler is developed for efficient near fine grain parallel processing of circuit simulation using direct method, which has not been realized in an actual multiprocessor system. The compiler automatically generates circuit simulation program using a special intermediate language from SPICE input data format. The intermediate language has three types of structured control instructions and directives specifying task boundary. The compiler decomposes the program into tasks, analyzes data dependencies among tasks, schedules the tasks to processors and generates optimized parallel machine code. Next the parallel machine code generator generates different machine codes, each of which consists of instructions for task, data transfer and synchronization, for processors by using statically scheduling results.View full abstractDownload PDF (1543K) -
Kuninobu Tanno, Toshihiro Taketa, Susumu Horiguchi1994 Volume 114 Issue 5 Pages 588-594
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe two-dimensional fast Fourier transform (2-D FFT), which has a wide variety of application areas such as digital signal processing, speech recognition, and image processing, requires quite high-speed computing to handle a huge amount of data. Many parallel hardware FFT algorithms have been proposed for various types of parallel computers.
This paper discusses 2-D FFT algorithms which are implemented on an eight-neighbor processor array. These algorithms combine effectively the direct 2-D FFT algorithm and the communication capability of the 8-neighbor processor array. We propose three types of algorithms by taking account of data allocation strategies which are related to the number of processors P and the number of data elements N to be transformed. Algorithm 1 is a parallel FFT for the case N≤P. For N>P, Algorithm 2 and Algorithm 3 are proposed as two data allocation methods: a similarity allocation method and a superposition allocation method, respectively. By evaluating and comparing their processing times, we show that Algorithm 3 is fastest, and that the processor utilization rate is 100%. Further, we show that Algorithm 3 is faster than the algorithm proposed for a four-neighbor (mesh) processor array.View full abstractDownload PDF (974K) -
Chun-Zhi Jin, Kiyoshi Wada, Koutaro Hirasawa, Junichi Murata, Setsuo S ...1994 Volume 114 Issue 5 Pages 595-602
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSMost of real systems are continuous systems with nonlinearity. Usually, the systems are approximated by linear models, and are analyzed and designed using the well established linear system theory, because the analysis and the design of nonlinear systems are difficult, and the theories for them are not well established. However, there must be an approximation error due to the nonlinearity. In this paper, an approach to identification of nonlinear continuous time systems with measurement noise is proposed. In the approach the parameters of the linear approximate model are estimated from the sampled input-output data of the nonlinear systems by a low-pass filtering method, and the modeling error due to the nonlinearity is compensated by using neural network. Two types of neural network compensators are obtained based on two different ways of approximating the noise removed system output. In the training of the neural network, the teaching signals are provided by data smoothing method which enables on-line noise filtering and thus on-line training. The trained network compensats the modeling error effectively. An illustrative example is given to demonstrate the effectiveness of the proposed approach.View full abstractDownload PDF (1215K) -
Takatomo Mori, Hisaya Fukuda, Katsuari Kamei, Kazuo Inoue1994 Volume 114 Issue 5 Pages 603-608
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper describes the sensor fusion system using monocular vision and sonar sensor to recognize an environment for an indoor mobile robot. In our system the environment is represented by using the occupancy grids that Elfes has proposed. The occupancy grids are two-dimensional tessellations of space into cells where each cell contains a probabilistic estimate of its occupancy. Since they supply a common underlying representation for the interpretation of qualitatively different sensors, they also provide a natural framework for sensor integration. In order to cope with weakness of each sensor, the occupancy grids derived from camera and sonar are integrated into local map using Bayesian estimation procedure. The weakness of vision is to occur errors in distance due to shadows and reflections, while one of sonar is to occur errors in width due to beam width. Further, local maps made at different location are integrated into global map for robot navigation.View full abstractDownload PDF (2382K) -
Hideaki Ito, Takayuki Terashima, Nobuyuki Imai1994 Volume 114 Issue 5 Pages 609-610
Published: May 20, 1994
Released on J-STAGE: December 19, 2008
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