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Volume 38, Issue 7
Displaying 1-10 of 10 articles from this issue
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Takashi WATANABE, Kajiro WATANABE2002 Volume 38 Issue 7 Pages 581-589
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper describes a method to judge the sleep stages given by the 6 categories i.e., wake, REM sleep, Non-REM sleep of 1st, 2nd, 3rd and 4th stages. The conventional Rechtschaffen & Kales method using an expensive and sophisticated polygraph is the international standard to judge the sleep stages, but it gives strong physical and mental stress. The proposed method estimates the stages from the heartbeats and body motions in the sleep, non-invasively measured by a simple sensor. From the knowledge that the heartbeats change is strongly correlated with the sleep stages, the sleep stages given by the 6 categories are determined by categorizing the change in the heartbeats and body motion occurring for each sleep stages. The estimated sleep stages for the clinical trials over 27 nights and for 8 samples show satisfactory results to be used at home.View full abstractDownload PDF (2614K) -
Hirohisa SAKURAI2002 Volume 38 Issue 7 Pages 590-596
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe hydrostatic correction coefficients of the triple point cell of water are directly measured using two different types of cells and 3 different thermometers. The mean value of these coefficients obtained in this experiment is -0.856(15)mK/m, which is about 15% lower than the value assigned by the International Temperature Scale of 1990. The pressure dependency of the water-ice equilibrium is also directly measured using a specially designed triple point cell, which is possible to pressurize the water-ice equilibrium by helium. The pressure dependency of -73.9(1)mK/MPa is obtained, which is equivalent to the hydrostatic coefficient of -0.724(1)mK/m. The difference between these coefficients, which is larger than the experimental uncertainties, is shortly discussed comparing the experimental results of the hydrostatic coefficient of a floating ice mantle around the thermometer well. The temperatures at the bottom of the thermometer well is found to be about 0.2mK lower than the temperature extrapolated to the bottom of the well by the hydrostatic correction coefficient.View full abstractDownload PDF (1980K) -
Masaki MATSUOKA, Kojiro HAGINO2002 Volume 38 Issue 7 Pages 597-603
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we propose a design method of an adaptive gain controller using an observer for a linear timeinvariant system with uncertainties in the system matrix and the input matrix. The proposed controller consists of a fixed gain part and an adaptive gain part related to estimated values and inputs. In the case that uncertainties in the system matrix and the input matrix satisfy the matching conditions, we need no information on the upper bound of matched uncertainties for the design process. Finally, the effectiveness of the proposed controller is demonstrated by numerical simulations.View full abstractDownload PDF (1754K) -
Hisao KATOH, Yasuyuki FUNAHASHI, Wataru BANNO2002 Volume 38 Issue 7 Pages 604-608
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we consider the continuous-time preview control problem. We use H2 and H∞ norms as the performance indices of control systems. Using so-called factorization approach, the problems are transformed to model-matching forms. Then, we solve them by the method that is the extension of causal-type one.View full abstractDownload PDF (1207K) -
Akira KOJIMA, Manfred MORARI2002 Volume 38 Issue 7 Pages 609-616
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA design method for LQ optimal control law is considered for constrained continuous-time systems. By introducing singular value decomposition for finite-horizon linear systems, the sequence of LQ sub-optimal control laws, which converges to the exact solution, is obtained based on quadratic programming. It is also shown that the nonlinear sub-optimal feedback gain is found by the union of affine state functions.View full abstractDownload PDF (2243K) -
Toshiyuki OHTSUKA, Akira KODAMA2002 Volume 38 Issue 7 Pages 617-623
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper describes a piece of software that generates automatically a simulation program for nonlinear receding horizon control (NRHC). First, this paper summarizes the problem formulation and a real-time algorithm for NRHC. Then this paper describes the components and usage of the automatic code generation system named AutoGen and useful Mathematica functions for developing the system. A numerical example of a two-wheeled car is shown to demonstrate the developed system.View full abstractDownload PDF (1981K) -
Application to Grade Transition Problems of Polymerization ProcessYasunori SUZUKI, Chie SATO, Kyoko IZUMI, Tetsuya OHTANI2002 Volume 38 Issue 7 Pages 624-631
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn an industrial polymerization process, operating conditions are frequently changed in order to produce various grades of polymer sequentially in a single reactor. The process dynamics change globally due to grade changes and load changes. Therefore, the robust servo controller is required in order to make grade transitions more quickly and fewer products with off-specification during grade changeovers. In this paper, a robust design method of the two-degree-of-freedom servosystems is proposed. This method is based on the robust pole assignment. The robust pole assignment minimizes the condition number that is the index of robustness so that the sensitivity of the poles to perturbations is minimized. The tracking performance is assigned by the closed-loop poles and the robustness property is optimized simultaneously by the robust pole assignment. The proposed robust servo controller is applied to the ideal process model of a polyethylene gas-phase polymerization process, and the robust performance is showed. Finally, the controller is applied to the process simulator that has more reality in the process behavior. This robust servo controller resulted in better control performance than conventional PID controllers did.View full abstractDownload PDF (1624K) -
Hiroshi KAWAKAMI, Tadataka KONISHI, Hidetsugu SUTO, Osamu KATAI2002 Volume 38 Issue 7 Pages 632-640
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSFor supporting functional design process by using computer, one of the promising way is to utilize knowledge or tips on design. One practical way for supporting functional design is to facilitate designers to refer to well-organized and sophisticated knowledge-bases of inventive principles and of physical effects. Designers are, however, required training to deal with these kinds of abstract pieces of knowledge and to combine them for creating design concepts. Thus, we will examine a case-based reasoning framework in which design examples instead of highly abstract inventive principles are utilized. Based on the assumption that each example in the case-base functions by employing physical laws and effects, and the examples are selected so as to be subject to Design Axioms introduced by Suh, the present work proposes a method to acquire physical causal networks which reflect design knowledge and to utilize them for re-design process for supporting designers.View full abstractDownload PDF (2636K) -
Kousuke INOUE, Jun OTA, Tamio ARAI2002 Volume 38 Issue 7 Pages 641-648
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper proposes a method for acquisition of behavior capable of multiple tasks by an agent with non-predesigned and continuous observation space in partially observable environment. In the proposed method, the agent discriminates the ongoing task from other tasks using experience acquired in acquisition process of behaviors corresponding to the tasks, and applies knowledge for the corresponding task. In order to cope with lack of clues for task-identification and bad influence on the task-execution behavior by the task-identifying behavior, additional learning process is executed as the need arises. Simulation results shows the proposed method can build a suitable behavior for multiple tasks in a simple partially observable grid-environment.View full abstractDownload PDF (3399K) -
Shigeru NINAGAWA, Akira SHINTANI2002 Volume 38 Issue 7 Pages 649-651
Published: July 31, 2002
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn the evolution of strategies in the iterated Prisoner's Dilemma, the abrupt decrease of species and the following return to the stationary value have been observed. This phenomena called punctuated equilibrium always accompanies the collapse of the cooperative relationship.View full abstractDownload PDF (459K)
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