Transactions of the Institute of Systems, Control and Information Engineers
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ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668

Transactions of the Institute of Systems, Control and Information Engineers Vol. 6 (1993), No. 10

  • A Solution of a Modified Flowshop Scheduling Problem by Using Genetic Algorithm

    pp. 437-445

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    DOI:10.5687/iscie.6.437

    This paper deals with an optimal production ordering problem for a modified flow-shop manufacturing process having two machines and a carrier. The carrier carries a product between machines and yards. Through the motion of the carrier, the succeeding part (Machine 2) gives an influence on the preceding part (Machine 1). This leads to a complicated constraint of the problem. Further, the objective function is defined for evaluating a constant rate of production as well as the total processing time. For obtaining a good suboptimal solution, the genetic algorithm is applied to this problem. A procedure for carrying out the operations of reproduction, crossover and mutation is shown. In particular, a desirable combination of individual description and crossover operation is found out for this problem.
  • Recognition of Automobiles from TV Video Signals

    pp. 446-453

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    DOI:10.5687/iscie.6.446

    The measurement of moving vehicles is necessary to grasp automobile trafficflow. Recently the image-processing type vehicle detector has been noticed as a new sensor. However, as it is very difficult in real time processing and moreover it has particular technical problems for image-processing in the outdoor environment, it has not been sufficiently utilized.
    In this paper, we propose a vehicle detecting method using waveform analysis on frequency domain to the brightness distribution signal from TV monitor. The features of our method are simple system construction because detection is achieved using finite frequency components and its spectrum ratio.
    The certitude and robustness of this method has been verified with recognition experiments.
  • An Efficient Method of Layering High Layer Protocol for ISDN Applications

    pp. 454-461

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    DOI:10.5687/iscie.6.454

    Recently ISDN (Integrated Services Digital Network) is getting popular to be used in data communications. It will open the wide area of application in various aspects in the near future. In this paper, in order to develop a variety of applications for ISDN communications, an effective construction method is proposed. First, a layered structure for communication systems is described together with the layer operation on the communication objects and the disciplines for layering system. Then, the ISDN communication toolkit is developed according to the layered structure. Finally, applying the proposed construction method, a novel image transmission system is realized, which was used in the experiment of image transmission during the international flower and green expo '90 in Osaka. By using the image transmission system, a distance database of Hi-Vision image was re-constructed, which was used in the teleprinting experiment in August 1990. The results of two experiments were quite acceptable. And, the proposed method is effective for constructing ISDN communication systems, which needs fewer changes for re-construction.
  • Optimal Tracking Control of Nonsquare Systems

    pp. 462-470

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    DOI:10.5687/iscie.6.462

    For nonsquare plants, we propose a method for designing optimal tracking and servo systems based on quadratic performance indices. It is assumed that the number of inputs of the plant is greater than that of outputs. In this case, the steady-state input achieving a specified reference signal at the output is not unique. We utilize this freedom to improve the transient behavior of tracking. The optimal control laws are composed of state feedback with an optimal regulator gain, feedforward of the reference signal, and a constant term determined by the initial state of the system. The constant term is not needed if we assume that the change of the reference signal occurs only when the plant is in a steady state.
  • Experimental Study of Control Systems Using Fuzzy Inference for Absorption Chillers/Heaters

    pp. 471-478

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    DOI:10.5687/iscie.6.471

    Generally speaking, it is difficult to make a model which satisfies completely all the characteristics for absorption chillers/heaters, therefore PID control is often used. In this paper, to improve energy saving with stable and fast response, we apply fuzzy control using well-known characteristics as knowledge for fuzzy inference to absorption chillers/heaters.
    Consequently it is verified with experiments on a 100 USRton double stage absorption chillers/heaters that proposed multi-input fuzzy controlled system is better then PID controlled system with gains adjusted by fuzzy interence, when refrigeration load is quickly changed like step change, start-up and temperature of cooling water increases.

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