Transactions of the Institute of Systems, Control and Information Engineers
Online ISSN : 2185-811X
Print ISSN : 1342-5668
ISSN-L : 1342-5668
Volume 7 , Issue 5
Showing 1-7 articles out of 7 articles from the selected issue
  • Taikyu KIM, Toshiyuki MAEDA, Takahisa ONO, Haruhisa HUJITA
    1994 Volume 7 Issue 5 Pages 153-159
    Published: May 15, 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
    An approach to improving attenuation cutoffs is proposed to linear phase filters based on the Lagrangean B-filters approximating the ideal low-pass filter. The impulse response of the mth order Lagragean B-filter holds a non-negative even function symmetry, and all its derivatives of order up to (m-1) are continuos. Hence, the B-filters have linear phase properties in nature. The mth order B-filters are connected in parallel in view of more convenient implementations of circuits than conventional cases, and then each peak component of sidelobe spectra standing close by the main lobes of their frequency domains is cancelled out. This can result in sharper attenuation cutoffs than the mth order B-filter. These mth order linear phase filters realized by this method preserve the bandwith and the asymptotic decay rate of the sidelobe envelope in the mth order B-filter. This approach is illustrated by a few numerical examples.
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  • Shin HASEGAWA, Toshiyuki INAGAKI
    1994 Volume 7 Issue 5 Pages 160-167
    Published: May 15, 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
    This paper gives a Dempster-Shafer (DS) theoretic approach for realizing decision support in safety-control for large-complex systems. We show that rules of combination in the conventional framework of the DS theory are not always adequate for representing various knowledge on characterisitics of systems which must be controlled. This paper extends the current framework of the DS theory into a general one so that it can reflect operators' system-specific knowledge. Usefulness of our extension is proven by taking a safety-control problem as an example.
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  • Masao KAWASAKI, Yasuo ARIKI, Yoshiaki INOUE
    1994 Volume 7 Issue 5 Pages 168-175
    Published: May 15, 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
    At present, print boad checking devices (called jig) are widely used for electrical checking of multi-layer print boards. To design these devices, it is required to extract points, which correspond to ends of electrical circuits, from the print films. The point extraction work has been done by human beings and it makes their eyes extremely tired.
    This paper describes an image processing system for newly developed for automatic point extraction, after feeding print films by one-dimensional line sensor with high resolution.
    The features of the system to extract the points are :
    (1) Local image processing is carried out on the large amount of data for processing efficiency.
    (2) Global processing that signal connection is checked between print boards is incorporated for processing accuracy.
    (3) The system is designed to be universal so that multi-layer print boards can be dealt with.
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  • Masashi NAKAMOTO, Keiko SHIMIZU, Hiroshi FUKUDA, Shiro HINO
    1994 Volume 7 Issue 5 Pages 176-184
    Published: May 15, 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
    In this paper H control has been applied to an interactive steam pressure and steam flow control system of a Heat Recovery Steam Generator (HRSG) of a thermal power plant. The controller structure is taken account for practical applications on a commercial plant. H control for the interactive system is verified the experiments on a commercial sized test facility. In addition to the nominal performance, robustness of Hcontrol has been also verified. To demonstrate a practical applicability, the experiments for signal saturation and noise reduction have been accomplished.
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  • Yasumasa FUJISAKI, Masao IKEDA
    1994 Volume 7 Issue 5 Pages 185-191
    Published: May 15, 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
    A two-degree-of-freedom model following servosystem is proposed. First, a model following control system with no integral compensator is designed for a nominal plant, a given reference model, and a specified performance index. The obtained control system is augmented with an integral compensator. Then, additional feedforward and feedback are introduced at the output of the integrator to cancel the integral action for reference signals under the assumptions that there is no modeling error of the plant and no disturbance input to the plant. When the modeling error or the disturbance input exists, the integral effect appears so that the steady state error in the control output is eliminated.
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  • Toshiro ONO, Masafumi YAMAMOTO, Teruyo WADA
    1994 Volume 7 Issue 5 Pages 192-194
    Published: May 15, 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
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  • 1994 Volume 7 Issue 5 Pages e1
    Published: 1994
    Released: October 13, 2011
    JOURNALS FREE ACCESS
    Download PDF (71K)
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