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Transactions of the Institute of Systems, Control and Information Engineers Vol. 15 (2002), No. 11

ISIJ International
belloff
ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668
Publisher: THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

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Transactions of the Institute of Systems, Control and Information Engineers Vol. 15 (2002), No. 11

Short-Range Communication Using Airborne Ultrasonic Wave and Its Application to Support Walking for Visually Handicapped Persons

Kazuhiro KOSHI, Yoshiaki TADOKORO

pp. 569-576

DOI:

10.5687/iscie.15.569

Abstract

This paper presents a short-range communication system using airborne ultrasonic wave. This system is well suited to transmit environmental information in small area. In this paper, we also consider to apply the system to a sign-post system for visually handicapped persons. The sign-post system plays an important role in supporting the visually handicapped who walk without a supporter.

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Short-Range Communication Using Airborne Ultrasonic Wave and Its Application to Support Walking for Visually Handicapped Persons

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Ris

Smith Predicted Type Robust PI Controller with Adaptive Modification for the Thickness Control in the Rolling Mill

Satoshi NISHINO, Akira KITAMURA

pp. 577-585

DOI:

10.5687/iscie.15.577

Abstract

This paper proposes a new thickness control method for the rolling mill using the robust PI controller with Smith predictor and adaptive modification. In the rolling process, Several kind of AGC (Automatic Gage Control) were proposed. However, there remain problems that are an absence of robust stability and the difficulty of tuning and maintenance for the parameter change. The proposed method compensates the time delay by Smith method and stabilizes robustly the Smith predictor having vulnerability for the parameter change. And the adjustment and the maintenance of the contoroller become easy, because the PI controller is used as the main regulator. Moreover, Adaptive modification for the accelerating rolling speed enable the excellent thickness property every part of the strip. The results of numerical experiment show the usefulness of the proposed controller.

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Smith Predicted Type Robust PI Controller with Adaptive Modification for the Thickness Control in the Rolling Mill

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An Analytical Criterion for Stability Boundaries of Non-Autonomous Systems Based on Melnikov's Method

Yoshihiko SUSUKI, Takashi HIKIHARA

pp. 586-592

DOI:

10.5687/iscie.15.586

Abstract

This paper proposes an analytical criterion for stability boundaries of non-autonomous systems. The criterion can analytically enlarge the conservative stability limits obtained by the classical Lyapunov's direct method almost up to the exact stability boundaries even for non-autonomous systems. It is based on the Melnikov's method which estimates homoclinic intersections in the dynamical systems theory. The definition of the criterion has strong advantages in its easy and quick estimation of the stability, compared with the numerical integration of the non-autonomous systems. The effectiveness is confirmed in its application to an electric power system with dc transmission under periodic swing.

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An Analytical Criterion for Stability Boundaries of Non-Autonomous Systems Based on Melnikov's Method

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Stabilization of Control Systems with a Periodic Communication Constraint by an Observer-based Controller

Shigeru YAMAMOTO, Taiki KAWAGOE, Toshimitsu USHIO

pp. 593-599

DOI:

10.5687/iscie.15.593

Abstract

This paper considers a stabilization problem for a communication system where a controller and a plant are linked with a network bus. The network bus usually has a capacity constraint so that it is impossible to transmit or receive all data at the same time which we need to control the plant. In this paper, we assume a periodic constraint of the data transmission. To solve such a stabilization problem with the periodic constraint, we adopt a periodic observer-based controller. Furthermore, we derive stabilizability and detectability conditions for the system and develop the design method of the periodic controller gain.

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Stabilization of Control Systems with a Periodic Communication Constraint by an Observer-based Controller

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Associative Memory with Hidden Units by a Hybrid Learning

Jun TSUZURUGI, Norikazu TAKAHASHI, Shin ISHII

pp. 600-606

DOI:

10.5687/iscie.15.600

Abstract

In the conventional neural associative memories, auto-correlation (Hebbian) learning has often been used. This paper proposes an associative memory model consisting of visible units and hidden units. The connections among the visible units are determined by auto-correlation learning, and the connections between the visible units and hidden units are determined by the error back-propagation learning. These two kinds of learning constitiute a hybrid unsupervised learning. Experiments show that our associative memory based on the hybrid learning has larger basins of attraction and less spurious memories than the existing models.

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Associative Memory with Hidden Units by a Hybrid Learning

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Training of Support Vector Machines by the Steepest Ascent Method

Shigeo ABE, Youichi HIROKAWA, Seiichi OZAWA

pp. 607-614

DOI:

10.5687/iscie.15.607

Abstract

Since the training of support vector machines needs to solve the dual problem with the number of variables equal to the number of training data, the training becomes slow when the number of training data is large. To speed up training the Sequential Minimal Optimization (SMO) technique has been proposed, in which two data are optimized simultaneously. In this paper, we propose to extend SMO so that more than two data are optimized simultaneously. Namely, we select a working set including variables, solve the equality constraint for one variable included in the working set, and substitute it into the objective function. Then we solve the subproblem related to the working set by calculating the inverse of the Hessian matrix. We evaluate our method for the five benchmark data sets and show the speed-up of training over SMO.

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Training of Support Vector Machines by the Steepest Ascent Method

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Realization of Spin Motion of Spacecraft by Two Wheels

Katsuhiko YAMADA, Shoji YOSHIKAWA

pp. 615-623

DOI:

10.5687/iscie.15.615

Abstract

We investigate a method of attitude control with two wheels when a spacecraft has initial angular momentum. If we assume the wheels as attitude control actuators, the spacecraft body generally rotates since the whole angular momentum of the spacecraft is conserved in the inertial system. Assuming the motion of the spacecraft body as pure spin motion around a certain axis, we consider the problem of directing the axis of rotation to the desired direction in the inertial system. The attitude control law proposed here has a very simple form and can achieve the desired motion with the wheels by devising the attitude variables and the direction of the inertial system. Finally, we confirm the effectiveness of this attitude control law by numerical simulations.

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Realization of Spin Motion of Spacecraft by Two Wheels

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