Transactions of the Society of Instrument and Control Engineers
Online ISSN : 1883-8189
Print ISSN : 0453-4654
ISSN-L : 0453-4654
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Volume 45, Issue 7
Displaying 1-7 of 7 articles from this issue
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Paper
Control
  • Identifiability and Performance Analysis of Output Over-sampling Approach to Direct Closed-loop Identification
    Lianming SUN, Akira SANO
    2009 Volume 45 Issue 7 Pages 339-348
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.339
    JOURNAL FREE ACCESS
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    Output over-sampling based closed-loop identification algorithm is investigated in this paper. Some instinct properties of the continuous stochastic noise and the plant input, output in the over-sampling approach are analyzed, and they are used to demonstrate the identifiability in the over-sampling approach and to evaluate its identification performance. Furthermore, the selection of plant model order, the asymptotic variance of estimated parameters and the asymptotic variance of frequency response of the estimated model are also explored. It shows that the over-sampling approach can guarantee the identifiability and improve the performance of closed-loop identification greatly.
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  • Estimation of the Transition Time of Piecewise Linear Systems by Using Wavelet Analysis
    Tomoaki KASHIWAO, Kenji IKEDA, Takao SHIMOMURA
    2009 Volume 45 Issue 7 Pages 349-355
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.349
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    This paper proposes an estimation method of the transition time of hybrid systems in piecewise linear (PWL) form by using wavelet analysis. If each transition time is known, the continuous dynamics between adjacent discrete transitions will be identified by conventional identification method for continuous systems. The discrete transition is represented as a switching of differential equations or a jump of continuous states. These changes can be detected as characteristic patterns in wavelet transform of an output signal. First, detectability of the discrete transition is defined and its necessary and sufficient condition is derived. Under the assumption of the detectability of the discrete transition, an output signal is represented by using Taylor expansion around the transition time. In addition, the characteristic patterns in the wavelet transform of an output signal are analyzed. An estimation method of the transition time based on the analyzed pattern is proposed. Finally, the effectiveness of the proposed method is illustrated by numerical examples.
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  • Model-matching Quantization for a Class of SISO Nonlinear Systems
    Shun-ichi AZUMA, Toshiharu SUGIE
    2009 Volume 45 Issue 7 Pages 356-360
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.356
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    This paper addresses a model-matching problem between a given SISO nonlinear plant and the cascade connection of the plant and a quantizer to be designed. First, a closed-form solution to the problem is derived. From this, we next show several fundamental properties of the optimal quantization for control. Finally, the performance of the proposed quantizer is demonstrated by numerical simulations.
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Systems and Information
  • Restoration of Halftone Image Using Genetic Algorithms
    Tamotsu FURUYA, Kunihiko MORI
    2009 Volume 45 Issue 7 Pages 361-368
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.361
    JOURNAL FREE ACCESS
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    In this study, we propose a new method for an inverse halftoning technique. Inverse halftoning technique is to restore a continuous tone (gray-scale) image from halftone (bi-level) image. Usually, it is not easy to derive gray-scale color (8bits/color) from only a bi-level data (black and white). We considered generating a gray-scale value from bi-level data as an optimum searching problems. Then, we propose a method of the inverse halftoning technique using the genetic algorithms without depending on the halftone kernel. As a result, a high quality image can be restored without depending on a halftone kernel.
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  • Decomposition and Coordination Method for Flowshop Scheduling Problems Represented by Timed Automata
    Masato WAKATAKE, Tatsushi NISHI, Masahiro INUIGUCHI
    2009 Volume 45 Issue 7 Pages 369-378
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.369
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    In this paper, we propose a decomposition and coordination method for timed automata for modeling and solution of flowshop scheduling problems. Parallel composition of timed automata makes it possible to describe concurrent dynamics for several submodels. To reduce state space explosion for solving an optimal state transition problem represented by the parallel composition of timed automata, a decomposition and coordination method for timed automata is developed. In the proposed method, a feasible solution is derived by the replication of solving each subproblem and coodinating the solution of each decomposed subproblem. Computational experiments demonstrate the effectiveness of the proposed method for flowshop scheduling problems.
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System Integration
  • Robot Pose Estimation on Floor Equipped with a Lattice of RFID Tags
    Kenri KODAKA, Haruhiko NIWA, Yoshihiro SAKAMOTO, Shigeki SUGANO
    2009 Volume 45 Issue 7 Pages 379-387
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.379
    JOURNAL FREE ACCESS
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    A method of estimating pose of a robot on a lattice of RFID tags is described. There is a model room in WABOT-HOUSE Laboratory of Waseda University where the floor is equipped with a lattice of RFID tags at 300 mm intervals, simulating a future home environment where robots interact symbiotically with humans. This paper propose a method that uses Monte Carlo localization to estimate the pose of robot on the lattice more precisely than the interval of tags. The experience shows the position and orientation error converge at about 50 mm (straight movement) / 20 mm (rotating movement) and less than 0.1 radian using some properly designed model-parameters, which are tuned in accordance with our simulation results, when two readers are placed appropriately. Moreover, we describe some items about where readers should be placed.
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