著者

小木曽 公尚 平田 研二

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.26, no.5, pp.156-164, 2013 (Released:2013-08-15)

参考文献数

21

被引用文献数

1

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This paper proposes a remote control method for a linear system with pointwise-in-time state and/or control constraints. Our technique guarantees achievement of tracking performance and constraint fulfillment under simultaneous occurrence of some phenomena over communication links, such as arbitrary and unforeseeable delays and lots of packet losses. Our ideas are to feedback information about not a state but a state-existing area and to share maximal output admissible sets with reference governor and switching control strategy that consist of the proposed technique. Through numerical and experimental examples, we demonstrate effectiveness of the proposed method.

著者

Koji Sasano Hiroshi Okajima Nobutomo Matsunaga

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

Transactions of the Institute of Systems, Control and Information Engineers (ISSN:13425668)

巻号頁・発行日

vol.23, no.11, pp.257-264, 2010 (Released:2011-05-21)

参考文献数

22

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Recently, the fractional order PID (FO-PID) control, which is the extension of the PID control, has been focused on. Even though the FO-PID requires the high-order filter, it is difficult to realize the high-order filter due to the memory limitation of digital computer. For implementation of FO-PID, approximation of the fractional integrator and differentiator are required. Short memory principle (SMP) is one of the effective approximation methods. However, there is a disadvantage that the approximated filter with SMP cannot eliminate the steady-state error. For this problem, we introduce the distributed implementation of the integrator and the dynamic quantizer to make the efficient use of permissible memory. The objective of this study is to clarify how to implement the accurate FO-PID with limited memories. In this paper, we propose the implementation method of FO-PID with memory constraint using dynamic quantizer. And the trade off between approximation of fractional elements and quantized data size are examined so as to close to the ideal FO-PID responses. The effectiveness of proposed method is evaluated by numerical example and experiment in the temperature control of heat plate.

著者

Ishikawa Masaaki

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.25, no.12, pp.343-348, 2012 (Released:2013-03-15)

参考文献数

19

被引用文献数

2 6

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Despite the advanced medical technology, infectious diseases remain a continuing threat to mankind. Hence, a prevention of prevalence of infectious diseases is one of important problems in epidemiology. In the past, the public health system has prepared for some strategies such as antibiotics and vaccines to control the infectious disease development. In order to build up more effective strategies, we need a precise theoretical analysis of infectious diseases. From a theoretical viewpoint, the mathematical model which describes the spread of the infectious disease has a very important role. In this paper, we study the stochastic modeling of the infectious disease in populations consisting of four groups: susceptible, infected, recovered and vaccinated. We consider the optimal vaccination strategy under the framework of the stochastic optimal control problem. Applying the stochastic maximum principle and the four-step scheme to the considered stochastic optimal control problem, we construct a feasible optimal vaccination system.

著者

上田 洋 村上 晴美 辰巳 昭治

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.22, no.6, pp.229-240, 2009 (Released:2011-04-22)

参考文献数

15

被引用文献数

1 2

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Distinguishing different people with identical names is becoming more and more important in person searches on the Web. The aim of this research is to dispatch useful labels for identifying persons in “person clusters,” which are generated as a result of person searches on the Web. In this paper, we propose a method to label person clusters with “vocation-related information.” The vocation-related information includes broader terms that may be considered as vocations, and terms that are useful to infer vocations, not only those rigorously defined as vocations. Our method is based on (a) extracting candidates of vocation-related information by using HTML structures and simple heuristics, and (b) generating vocation-related information by using term frequencies,synonym clustering, and Web search engines. Experimental results revealed the usefulness of the proposed method.

著者

若佐 裕治 荒川 瑞恵 田中 幹也 明石 卓也

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.22, no.10, pp.357-363, 2009 (Released:2011-04-22)

参考文献数

15

被引用文献数

3

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This paper proposes a decentralized model predictive control method based on a dual decomposition technique. A model predictive control problem for a system with multiple subsystems is formulated as a convex optimization problem. In particular, we deal with the case where the control outputs of the subsystems have coupling constraints represented by linear equalities. A dual decomposition technique is applied to this problem in order to derive the dual problem with decoupled equality constraints. A projected subgradient method is used to solve the dual problem, which leads to a decentralized algorithm. In the algorithm, a small-scale problem is solved at each subsystem, and information exchange is performed in each group consisting of some subsystems. Also, it is shown that the computational complexity in the decentralized algorithm is reduced if the dynamics of the subsystems are all the same.

著者

岩村 幸治 眞弓 宗久 谷水 義隆 杉村 延広

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.26, no.4, pp.129-137, 2013 (Released:2013-07-15)

参考文献数

15

被引用文献数

1 1

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Autonomous Distributed Manufacturing Systems (ADMS) have been proposed to realize flexible control structures of manufacturing systems. In the previous researches, a real-time scheduling method based on utility values has been proposed and appliedto the ADMS. In the proposed method, all the job agents and the resource agents evaluate the utility values for the cases where the agent selects the individual candidate agents for the next machining operations. Multi-agent reinforcement learning is newly proposed and implemented to the job agents and resource agents, in order to improve their coordination processes. In the reinforcement learning method, an agent must be able to sense the status of the environment to some extent and must be able to takeactions that affect the status. The agent also must have a goal or goals relating to the status of the environment. The status, the action and the reward are defined for the individual job agents and the resource agents to evaluate the suitable utility values based on the status of the ADMS.

著者

中村 善一 木戸出 正継

出版者

THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.22, no.1, pp.37-47, 2009 (Released:2011-03-03)

参考文献数

29

被引用文献数

1 2

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This paper investigates writer verification using feature parameters based on the knowledge of document examiners, which are automatically extracted from handwritten kanji characters on a digitizing tablet. Criteria of feature selection using the evaluation measure that is obtained by modifying the measure of decidability, d-prime, is established and the criteria are applied to the evaluation measures that are calculated from learning samples. Then two classifiers based on the frequency distribution of deviations of the selected features are proposed and its design method using learning samples is showed. The effectiveness of the proposed method is evaluated by verification experiments with the database including skilled forgeries. The experimental results show that the proposed methods are effective in writer verification.