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Volume 52, Issue 7
Displaying 1-7 of 7 articles from this issue
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Paper
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Takuro KATO, Takayuki ISHIZAKI, Masakazu KOIKE, Jun-ichi IMURA2016 Volume 52 Issue 7 Pages 359-367
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSIn this paper, we propose a synthesis method of multi-time-resolved control systems for discrete-time linear systems. In this method, on the basis of a low-rank model stemming from the Wedderburn rank reduction, we derive a redundant state-space realization of systems that enables a systematic design of a dynamical compensator stabilizing the short-time behavior of systems. Owing to the fact that the low-rank model has the same reachable and observable subspaces as the original system, we can systematically design a multiresolved control system while explicitly considering the short-time and long-time behavior of systems. The efficiency of the multiresolved control is shown through an illustrative example of frequency control of power systems.View full abstractDownload PDF (938K) -
Yuji OKAMOTO, Jun-ichi IMURA, Mariko OKADA-HATAKEYAMA2016 Volume 52 Issue 7 Pages 368-375
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSThis paper proposes a new system representation called a positive quadratic system for analysis and synthesis of molecular interaction in a cell, which includes a signal transduction pathway and a gene expression transcriptional regulation. One of the features of the proposed model is that it can capture the quadratic property of molecular interaction as well as the positivity properties of the state variables in terms of a rather simple form. Based on this model, we derive a sufficient condition of the stability of the origin in the sense of Lyapunov, and present a method for estimating an invariant set depending on the initial state and a positive invariant set. We show that the proposed method is effective by numerical simulations of two fundamental biological models.View full abstractDownload PDF (687K) -
Kanaru OOOKA, Toshiki OGUCHI2016 Volume 52 Issue 7 Pages 376-384
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSThis paper considers the synchronization problem in networks of nonlinear systems with time-delayed couplings. We show that synchronization patterns can be estimated from eigenvectors of the graph Laplacian combined with the scaling method for synchronization conditions. Furthermore, we consider synchronization in large-scale networks created by taking a couple of graph products of networks. By combining the proposed estimation method with the properties of graph products, we can easily detect synchronization patterns emerging in the networks from the eigenvalues of the original networks. Some numerical examples illustrate the validity of the proposed estimation methods.View full abstractDownload PDF (5728K) -
Akira IKUTA, Hisako ORIMOTO2016 Volume 52 Issue 7 Pages 385-392
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSIn the actual sound environment system, the observed data are inevitably contaminated by the background noise of arbitrary distribution type. Furthermore, the observations often contain fuzziness due to several causes and exhibit level saturation owing to the existence of a finite dynamic range. In this study, a signal processing method for estimating a specific signal based on fuzzy observations with the existence of background noise of non-Gaussian distribution forms is proposed in a form appropriate for the finite level range of the measured data. More specifically, after introducing a Jacobi polynomial defined within a finite fluctuation range of sound level, by considering the probability measure of fuzzy events, a method to estimate the fluctuation wave form of a specific signal under existence of background noise is theoretically proposed. The effectiveness of the proposed theory is confirmed by applying it to actual traffic noise data.View full abstractDownload PDF (905K) -
Hiroshi OKAJIMA, Yuki MINAMI, Nobutomo MATSUNAGA2016 Volume 52 Issue 7 Pages 393-400
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSNetworked control has been studied by many researchers in recent years. This paper proposes a new system structure of the networked control systems. The evaluation system is presented to find the performance degradation caused by the communication channels. The proposed system has high degree of freedom for design and is not cumbersome structure. The effectiveness of the proposed structure is illustrated by numerical simulations.View full abstractDownload PDF (1219K) -
Kengo URATA, Masaki INOUE2016 Volume 52 Issue 7 Pages 401-407
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSWe propose a class of dynamical systems that enables us to quantitatively evaluate dissipation performance in addition to expressing qualitative dissipative properties. Assuming that two subsystems belong to the proposed class, we show that the dissipation performance is strictly improved via feedback connection. We construct a larger-scale system via recursive feedback connection of the dissipate subsystems. Then, the performance of the entire network system is gradually reinforced with the increase of the number of subsystems. Ultimately, the output of the system cannot be driven by any disturbance input.View full abstractDownload PDF (603K)
Short Paper
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Hirokazu TANIMOTO, Ryo AMANO, Youji OCHI, Yoshinobu MAEDA2016 Volume 52 Issue 7 Pages 408-410
Published: 2016
Released on J-STAGE: September 29, 2016
JOURNAL FREE ACCESSWe demonstrated a pup-up tag which is attached to fish and records action data for a fixed period. The tag is collected using the ARGOS system. The pop-up tag has an accelerometer, an angular velocity sensor and a pressure/temperature sensor. The characteristics of the accelerometer showed available performance from the relation between the acceleration and the angular velocity of turntable.View full abstractDownload PDF (482K)
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