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Volume 36, Issue 10
Displaying 1-9 of 9 articles from this issue
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Masahiro YOKOMICHI, Masasuke SHIMA2000 Volume 36 Issue 10 Pages 819-825
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, the output regulation problem for nonlinear systems is considered. It is known that, this problem is solvable iff there exists a solution of partial differential-algebraic equation (PDAE) associated with the dynamics and the output equation of the systems. In general, it is difficult to solve such PDAE and several approximate solutions have been proposed. The radial basis function (RBF) network is adopted in order to solve the PDE approximately. The effectiveness of the approach is examined by numerical experiment for the well-known ball and beam system.View full abstractDownload PDF (1764K) -
Takao HINAMOTO, Takuya INOUE2000 Volume 36 Issue 10 Pages 826-832
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a set of the optimal state-space descriptions with minimum L2-sensitivity is synthesized for continuous-time linear systems. First, an L2-sensitivity measure is defined for continuous-time linear systems by using a pure L2-norm. An expression is then developed for evaluating L2-sensitivity in continuous-time linear systems. Next, an iterative method is applied for obtaining the optimal coordinate transformation that minimizes the L2-sensitivity measure. Finally, a numerical example is given to illustrate the utility of the proposed technique.View full abstractDownload PDF (1106K) -
Masatoshi HARIGAE, Toshiaki TSUJII, Masaaki MURATA2000 Volume 36 Issue 10 Pages 833-841
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWith the focus on the taxi guidance phase where an airplane runs on a taxi-way, this paper investigates how to build a navigation system which not only measures the airplane's position precisely but also detects obstacles in its path to avoid collision. For that purpose, the system combines the kinematic GPS with camera images. The idea is to detect obstacles by calculating the difference between the synthetic vision made by position and attitude data of the kinematic GPS and the camera images. Carrying the system, the airplane will be able to perform the autonomous traffic control for the taxi guidance phase.View full abstractDownload PDF (4733K) -
Takahiro YOSHIMI, Toshiharu TAURA2000 Volume 36 Issue 10 Pages 842-851
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWhen a machine learning system solves problems, all of the ‘properties’ of the input information are not always required. Therefore, the authors assume that a certain mechanism which can select specific properties to be gazed. For the realization and discussion of this mechanism, the authors have focused on the Classifier System (CS). The CS also involves such “duality” that both the optimization processes of rules for problem solving and the generalization processes of input information are in a single process, which may lead to problems. In this paper, the authors propose a computational model in which these two processes are explicitly separated. The key concept of the proposed model is the Gazing point Controlling Process for the purpose of using rules for selecting properties to be gazed. This is separated from the standard rules for solving problems. A computer system is developed to evaluate the utility of this model. The results acquired by applying the model to an example problem are summarized as follows: (1) by means of using the model here, the process of selecting properties are explicitly observed which is hidden in the standard CS, (2) the model can handle another kind of input information of selecting properties and (3) it results in more effectively than the standard CS.View full abstractDownload PDF (5671K) -
Yoshio MOGAMI, Norio BABA, Nobuhiro TANI2000 Volume 36 Issue 10 Pages 852-858
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, an LR-I type learning algorithm is constructed for variable hierarchical structure learning automata with S-model stationary random environment at each level. The learning propertiy of our algorithm is considered theoretically, and it is proved that the probability finding the optimal objective path can be approached 1 as much as possible by using our algorithm. In numerical simulation, the usefulness of our algorithm is shown.View full abstractDownload PDF (1790K) -
Takashi AKAHANE, Yoshihiro MIYAKE, Yoko YAMAGUCHI2000 Volume 36 Issue 10 Pages 859-868
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSBiological system can adapt to dynamic environments by including both flexibility to environments and consistency as a whole system. What is the mechanism of such biological autonomy? In this paper, we try to clarify the mechanism by developing the adaptation model of Physarum, which consists of mechanical system in endoplasmic sol and chemical system in ectoplasmic gel. As the results, chemical-oscillator system in ectoplasm was shown to generate the information for spatial relationship in the whole system, and hydrodynamic system in endoplasm was shown to affect the chemical system on large time scale. Through chemo-mechanical coupling between these two systems, it was clarified that its temporal development has a character of hysteresis and that adaptation to dynamic environments is realized based on this process.View full abstractDownload PDF (4307K) -
Kenji TAKAHARA, Hidetoshi WAKAMATSU, Itsuro MIYAZATO2000 Volume 36 Issue 10 Pages 869-874
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSAn automatic control system is proposed for respiratory failure patients under artificial ventilation. The whole control system is designed as a 2-input 2-output system based on an adaptive pole-assignment method. In this study, ventilation rate and inspired O2 tension are chosen as the input values, alveolar CO2 tension and arterial O2 saturation as the controlled values. The control system is divided into two subsystems: one is the control system of alveolar CO2 tension and the other is the control system of arterial O2 saturation. It is not so difficult to control alveolar CO2 tension, because the dynamic characteristics of alveolar CO2 tension are described as a 1-input 1-output system. On the other hand, it is rather difficult to control arterial O2 saturation, because the dynamic characteristics of arterial O2 saturation are described as a 2-input 1-output system, including the cross effects of ventilation rate and inspired O2 tension on arterial O2 saturation. Hereby, the dynamic characteristics of arterial O2 saturation are assumed to be represented by a 2-input 1-output mathematical model. Then, the effect of ventilation rate on arterial O2 saturation is regarded as an offset term. In which case, the proposed method makes the control system of arterial O2 saturation a 1-input 1-output system including the effect of ventilation rate. The effectiveness of the proposed control system is confirmed using a dynamic mathematical model of a human respiratory system, in both conditions of rest and a changing metabolic state..View full abstractDownload PDF (1520K) -
Hajime KITA, Isao ONO, Shigenobu KOBAYASHI2000 Volume 36 Issue 10 Pages 875-883
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe unimodal normal distribution crossover (UNDX) for the real-coded genetic algorithms (RCGA) proposed by Ono et al. shows excellent performance in optimization problems of multimodal and non-separable fitness functions in continuous search space. Through theoretical analysis of the UNDX, the authors have proposed design guidelines for crossover operators for the RCGA. In the present paper, a multi-parental extension of the UNDX is proposed so as to enhance its exploration ability. The formula of the extended UNDX called ‘UNDX-m’ is derived based on the aforesaid design guidelines. Further, the performance of the UNDX-m is evaluated by numerical experiments.View full abstractDownload PDF (2561K) -
Toshihiko WATANABE, Kayako OMURA, Kazuhiro FURUKAWA, Shozo WATANABE, M ...2000 Volume 36 Issue 10 Pages 884-886
Published: October 31, 2000
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn continuous casting process, it is important to keep the mold level steady in order to improve product quality and to maintain stable operation. We propose an improvement of mold level control using sliding mode control particularly for transitional operation such as starting up of the process. This system is applied to the process and found to be effective.View full abstractDownload PDF (527K)
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