論文 - 穂高 一条
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Optimal Wireless Power Transfer Circuit without a Capacitor on the Secondary Side 査読あり 国際共著
Sabriansyah Rizqika Akbar, Eko Setiawan, Takuya Hirata, Ichijo Hodaka
Energies 16 ( 6 ) 2023年3月
担当区分：責任著者 掲載種別：研究論文（学術雑誌）
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A Practical Method for Estimating Mutual Inductance in Wireless Power Transmission System 査読あり 国際共著
Takuto Nakamura, Takuya Hirata, Eko Setiawan, Ichijo Hodaka
International Journal of Circuits, Systems and Signal Processing 16 1027 - 1034 2022年6月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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The Frequency Response and Steady-State Analysis on Wireless Power Transfer Using Square Wave Input 査読あり
Sabriansyah Rizqika Akbar; Eko Setiawan; Takuya Hirata; Kazuya Yamaguchi; Ichijo Hodaka
2021 International Conference on Sustainable Information Engineering and Technology (SIET) 2021年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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A Design Approach to Wireless High-Power Transfer to Multiple Receivers with Asymmetric Circuit 査読あり
Sabriansyah Rizqika Akbar, Ichijo Hodaka
international journal of circuits, systems and signal processing 15 125 - 134 2021年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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A fast spotting strategy of optimal frequency in wireless power transfer 査読あり
Akbar S.R., Hodaka I.
International Journal of Electrical and Electronic Engineering and Telecommunications 9 ( 4 ) 242 - 246 2020年7月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Electrical and Electronic Engineering and Telecommunications
© 2020 Int. J. Elec. & Elecn. Eng. & Telcomm. One of the most common questions in the Wireless Power Transfer (WPT) system is how to transfer much power over coils driven by the AC power source. This paper concerns how to determine the frequency of AC power source optimal to maximum WPT. Although it is theoretically possible to determine the optimal frequency by wide range frequency sweep, it is practically important to spot it in a few trials of frequency. This paper proposes a frequency spotting strategy using a square wave input power signal. The strategy avoids a long time-consuming sweeping process with knowledge of response by square wave input. The Automatic Multiscale-based Peak Detection (AMPD) algorithm is applied to select the initial peak finding on every data sample increment iteration to further analysis to find the set of peak patterns by calculating error parameters.
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A novel nonlinear control of boost converter using CCM phase plane 査読あり
Setiawan E., Hodaka I.
International Journal of Electrical and Computer Engineering 8 ( 6 ) 4282 - 4289 2018年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Electrical and Computer Engineering
© 2018 Institute of Advanced Engineering and Science. All rights reserved. Boost converter is one of fundamental DC-DC converters and used to deliver electric power with boosted voltage in many electrical systems. Several control strategies have been applied to control a boost converter delivering a constant output voltage. Generally, boost converter works in two modes; one is called a Continuous Conduction Mode (CCM). Many researches use CCM model in the controller design, but they never ensure that the controller always works in CCM. This paper proposes novel nonlinear controller of boost converter designed using the modification of flow in phase plane. The proposed controller guarantees that the boost converter works only in CCM region. The simulation result confirms that our proposed controller brings the state variables from any initial point to a desired operating point successfully. copy; 2018 Institute of Advanced Engineering and Science.
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An automatic pressure control method to continuous hydrogen generation system 査読あり
Yu Cherry Aung, Ichijo Hodaka
2018 Joint International Conference on Science, Technology and Innovation, Mandalay with Japan University & Company Research Group cooperated by IEEE 2018年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Power efficiency improvement of wireless power transfer using magnetic material 査読あり
Morita S., Hirata T., Setiawan E., Hodaka I.
Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017 2017-January 304 - 307 2017年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017
© 2017 IEEE. Efficiency improvement of wireless power transfer system is studied using ferrite bars with keeping distance of electric power transmission. Experiments are performed to decide better installation of ferrite bars for improving efficiency; there are many possibilities how and where to install them. We conducted several experiments and devised a method of installing ferrite bar with high effect on WPT. Each result is compared with the case of no ferrite bar system. The result of experiments shows using ferrite bars is practical and cost effective. Some suggestion is given to drive wireless power transfer system with lower frequency, which is also noteworthy about the limitation of available power source.
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Accurate Symbolic Steady State Modeling of Buck Converter 査読あり
Eko Setiawan, Takuya Hirata, Ichijo Hodaka
International Journal of Electrical and Computer Engineering 7 ( 5 ) 2374 - 2381 2017年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Embedded System Based on PWM Control of Hydrogen Generator with SEPIC Converter 査読あり
Cheikh Fall, Eko Setiawan, M.Afnan Habibi, Ichijo Hodaka
AIP Conference Proceedings 2017年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
DOI： 10.1063/1.5003501
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The use of mathematics and electric circuit simulator software in the learning process of wireless power transfer for electrical engineering students 査読あり
M.Afnan Habibi,Cheikh Fall, Eko Setiawan, Ichijo Hodaka
AIP Conference Proceedings 2017年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
DOI： 10.1063/1.5003500
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Top-down Approach in Control Engineering Education: Hydrogen Generation Case 査読あり
Eko Setiawan, M.Afnan Habibi,Cheikh Fall, Ichijo Hodaka
AIP Conference Proceedings 2017年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
DOI： 10.1063/1.5003499
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Different Frequencies between Power and Efficiency in Wireless Power Transfer
Muhammad Afnan, Habibi, Hodaka, Ichijo
Memoirs of Faculty of Engineering, University of Miyazaki 46 31 - 34 2017年7月
記述言語：英語 掲載種別：研究論文（大学，研究機関等紀要）
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Steady State Symbolic Analysis of Buck Converter using Fourier series 査読あり
Eko Setiawan, Takuya Hirata, Ichijo Hodaka
2017 2nd International Conference on Frontiers of Sensors Technologies (ICFST) 2017年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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A criterion on existence and uniqueness of behavior in electric circuit 査読あり
Hirata T., Setiawan E., Yamaguchi K., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 4 ) 1529 - 1533 2016年8月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. Behavior of electric circuits can be observed by solving circuit equations symbolically as well as numerically. In general, symbolic computation for circuits with certain number of circuit elements needs much more time than numerical computation. It is reasonable to check the existence and uniqueness of the solution to circuit equations beforehand in order to avoid computation for the case of no solution. Indeed, some circuits have no solution; in that case, one should notice it and avoid to wait meaningless computation. This paper proposes a new theorem to check whether given circuit equations have a solution and their voltages and currents of all circuit elements are uniquely determined or not. The theorem is suitable for developing a computer algorithm and helps quick symbolic computation for electric circuits.
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熱電発電システムにおける開放電圧を用いた最大出力点の探索法 査読あり
奥将俊, 石津智子, 田島大輔, 迫田達也, 林則行, 穂高一条
日本太陽エネルギー学会誌 42 ( 4 ) 49 - 55 2016年7月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Using square wave input for wireless power transfer 査読あり
Yamaguchi K., Hirata T., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 1 ) 431 - 437 2016年2月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. A wireless power transfer (WPT) circuit is composed of a transmitting circuit with an AC power supply and a receiving circuit with a load, and the circuits are wirelessly connected each other. Then a designer chooses the wave form of the AC power supply. Many papers about WPT adopt a sinusoidal wave as the input. The frequency of the sinusoidal wave is generally determined to the resonant frequency of the circuit for high power transfer. Since the number of circuit elements in the power supply to generate a square wave is much less than that of a sinusoidal wave, WPT with a square wave input should be treated. In fact, some papers adopt a square wave as the input, and adjust the frequency of the square wave to the resonant frequency of the circuit. In this paper, we examine how the frequency of a square wave input affects power and efficiency of WPT circuits, and propose a procedure how to determine the frequency of the input to improve power and efficiency. Finally we discuss which wave should be adopted as an input and how the frequency of the input should be determined, regardless of whether resonant phenomena occur or not.
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High power wireless power transfer driven by square wave inputs 査読あり
Yamaguchi K., Hirata T., Hodaka I.
Advances in Intelligent Systems and Computing 388 341 - 346 2016年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Advances in Intelligent Systems and Computing
© Springer International Publishing Switzerland 2016. A power source used in wireless power transfer generates an AC wave to transfer electric power to a load which is not connected electrically but connected electromagnetically to the power source. In this paper, the power and efficiency are compared when a sinusoidal and a square waves which are typical AC waves are applied as power source voltage outputs. The condition under which the two waves respectively transfer equivalent power with electric wires is examined to figure out the effect of different waves. Then the power and efficiency are calculated by a mathematical approach with practical values of elements on various situations. Finally, this paper explores how input waves should be chosen for ideal wireless power transfer.
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A general method to parameter optimization for highly efficientwireless power transfer 査読あり
Yamaguchi K., Hirata T., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 6 ) 3217 - 3221 2016年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. This paper proposes a new and general method to optimize a working frequency and a load resistance in order to realize highly efficient wireless power transfer. It should be noticed that neither resonant frequency nor matched impedance maximizes efficiency of wireless power transfer circuit, in general. This paper establishes a mathematical model of a commonly used wireless power transfer circuit, and derives a mathematical expression of circuit efficiency which involves a working frequency, a load resistance and the other parameters as symbols. This enables us to find the optimal working frequency and load resistance. The result of this paper is compared with results by a method based on resonance and impedance matching, and then clarified by a numerical example.
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A symbolic equation modeler for electric circuits 査読あり
Hirata T., Yamaguchi K., Hodaka I.
ACM Communications in Computer Algebra 49 ( 3 ) 80 - 82 2015年9月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ACM Communications in Computer Algebra
When users analyze symbolically physical phenomena, software products which partially help them write a symbolic equation to the phenomena are available. In electric engineering, there are a few software products which compute symbolically voltages and currents of electric circuits. They cover the frequency response analysis on behavior of linear time-invariant (LTI) circuits. However, they do not cover symbolic computation on the time response of circuits. This paper introduces a software product which generates a model for computing the time response of LTI circuits.
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On Circuit Topologies of Wireless Power Transmission with Relay Coils 査読あり
Takuya Hirata, Yuta Yamamoto, Kazuya Yamaguchi, Eko Setiawan and Ichijo Hodaka
The 3rd International Conference on Computer Engineering and Mathematical Sciences 200 - 202 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Mathematical Expression of Optimal Frequencies for Wireless Power Transfer 査読あり
Kazuya Yamaguchi, Yuta Yamamoto, Takuya Hirata, Eko Setiawan and Ichijo Hodaka
The 3rd International Conference on Computer Engineering and Mathematical Sciences 826 - 827 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Frequency auto-tuning for efficient wireless power transmission by using system identification method 査読あり
Yuta Yamamoto, Kazuya Yamaguchi, Takuya Hirata, Eko Setiawan and Ichijo Hodaka
The 3rd International Conference on Computer Engineering and Mathematical Sciences 798 - 799 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Factorizing the Monodromy Matrix of Linear Periodic Systems 査読あり
Ichiro Jikuya, Ichijo Hodaka
Proceedings of 19th IFAC World Congress 2014年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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A note on the input-output structure of linear periodic continuous-time systems with complex-valued coefficients 査読あり
Ichiro Jikuya, Ichijo Hodaka
the 21st International Symposium on Mathematical Theory of Networks and Systems (MTNS 2014) 2014年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Kalman canonical decomposition of linear time-varying systems 査読あり
Jikuya I., Hodaka I.
SIAM Journal on Control and Optimization 52 ( 1 ) 274 - 310 2014年3月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：SIAM Journal on Control and Optimization
In this paper, a Kalman canonical decomposition of finite-dimensional linear timevarying continuous-time systems is revisited. Two types of Kalman canonical decompositions are considered; one is collectively dubbed the intervalwise Kalman canonical decomposition and the other is collectively dubbed the global Kalman canonical decomposition. Each type is classified into subtypes resulting from variants of controllabilities (i.e., controllability, reachability, and influenceability) and observabilities (i.e., observability, determinability, and visibility). This paper first investigates the invariance properties of subspaces resulting from variants of controllabilities and observabilities. This paper then gives a self-contained exposition of each Kalman canonical decomposition on an interval. The main result is to prove the existence of intervals on each of which each Kalman canonical decomposition exists. Moreover, the relations among different Kalman canonical decompositions are extensively studied and the inconsistency between the works by Youla and Weiss is resolved. © 2014 Society for Industrial and Applied Mathematics.
DOI： 10.1137/120873455
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Symbolic Computer-Aided Design for Wireless Power Transmission 査読あり
Takuya Hirata, Ichijo Hodaka
Proceedings of the 2014 International Conference on Circuits, Systems, Signal Processing, Communications and Computers (CSSCC 2014) 2014年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Using Non-Sinusoidal Inputs for Efficient Wireless Power Transmission 査読あり
Yuta Yamamoto, Ichijo Hodaka
Proceedings of the 2014 International Conference on Circuits, Systems, Signal Processing, Communications and Computers (CSSCC 2014) 2014年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Efficient Wireless Power Transfer - Resonance Does Not Imply High Efficiency 査読あり
Kazuya Yamaguchi, Ichijo Hodaka
Recent Advances in Electrical and Computer Engineering 45 - 48 2014年3月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Resonance and efficiency inwireless power transfer system 査読あり
Yamaguchi K., Hirata T., Yamamoto Y., Hodaka I.
WSEAS Transactions on Circuits and Systems 13 218 - 223 2014年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：WSEAS Transactions on Circuits and Systems
Many papers about wireless power transfer use resonant phenomena. In general if input frequency is adjusted to the resonant frequency, the amplitude of current or voltage will be maximal. Since the power of resistive load is determined by its current or voltage, the power will be maximal at the resonance. As for wireless power transfer, it is one of significant specifications to transfer power as much as possible. Then it is natural to try to maximize transmitted power with resonant phenomena. On the other hand, efficiency is another significant specification on wireless power transfer. However efficiency is defined as a ratio with two different powers, and it cannot be concluded that efficiency is always maximal when either power is maximal. Therefore efficiency has no straightforward relation with resonance in contrast with the relation between resonance and power. In this paper, we show an example which cannot realize the maximal efficiency, although resonant phenomena are caused and discuss why the situation is caused. An analytical method for wireless power transfer is clarified and how to choose an optimal frequency is scrutinized. The power of transmitting and receiving sides and efficiency are calculated by using mathematical models, e.g. a state equation, a transfer function.
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Feedback effect for wireless high-power transmission 査読あり
Yamamoto Y., Yamaguchi K., Hirata T., Hodaka I.
WSEAS Transactions on Circuits and Systems 13 241 - 245 2014年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：WSEAS Transactions on Circuits and Systems
Wireless power transmission is based on electromagnetical phenomenon between two separate coils. In order to transfer power from one to the other, we have to cause a time-varying current along one coil. Many of conventional wireless power transmission systems suppose a sinusoidal current of the coil. One reason for it could be the convenience that we have a sinusoidal power source as the industry standard. If we can use a power source which generates many types of wave form, we do not necessarily use the sinusoidal wave. In this study, we propose to add a feedback signal on a sinusoidal signal, that is, we propose to utilize a non-sinusoidal input. We will evaluate the sinusoidal wave and non-sinusoidal wave from the viewpoint of transmission power and efficiency to secondary side.
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Factorizing the monodromy matrix of linear periodic systems 査読あり
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 19 11743 - 11748 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IFAC Proceedings Volumes (IFAC-PapersOnline)
© IFAC. This note proposes a new approach to computing the Kalman canonical decomposition of finite-dimensional linear periodic continuous-time systems by extending the Floquet theory. Controllable and observable subspaces are characterized by factorizing the monodromy matrix. Then, the conditions for the existence of several periodic Kalman canonical decompositions are extensively studied. The relations to the Floquet factorization, the Floquet-like factorization, and the period-specific realization are also discussed.
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Hirata T., Yamamoto Y., Yamaguchi K., Hodaka I.
WSEAS Transactions on Circuits and Systems 13 266 - 273 2014年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：WSEAS Transactions on Circuits and Systems
Conventional researches onWireless Power Transmission systems use experimental or numerical method to analyze the systems. However, the situation will be better if symbolic method is available. This paper develops a software which generates a state equation directly from schematics. The software helps engineers that design circuits and obtain characteristics of circuits to analyze the behavior of circuits with circuit parameters by symbolic computing. Our software also provides various perspectives of the system with circuit parameters.
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Jikuya I., Hodaka I.
Proceedings of the American Control Conference 3171 - 3176 2013年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Proceedings of the American Control Conference
In this paper, a Kalman canonical decomposition of finite-dimensional linear periodic continuous-time systems is considered. This paper firstly investigates the invariance properties of the controllable subspace and the observable subspace. This paper then illustrates a counterexample to the existence of the periodic Kalman canonical decomposition in a typical setting, where the coefficients are restricted to be real-valued and the period of the transformed system is restricted to be the same as the given system. Motivated by this counterexample, this paper gives a self-contained exposition of the periodic Kalman canonical decomposition in real-valued coefficients. © 2013 AACC American Automatic Control Council.
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A New Arrangement with Time-Varying Capacitance for Power Generation 査読あり
Takuya Hirata, Ichijo Hodaka, Masanori Ushimizu
International Journal of Energy 7 ( 1 ) 19 - 22 2013年5月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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A period-specific realization of linear continuous-time systems 査読あり
Hodaka I., Jikuya I.
Systems and Control Letters 62 ( 5 ) 395 - 400 2013年3月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Systems and Control Letters
It is a well-known fact that a weighting pattern matrix has a periodic realization if and only if the matrix is separable and periodic. This fact, however, does not cope with a reasonable question of period-specific realization problem: for a given weighting pattern matrix and a given positive real number, find a periodic realization corresponding to the given matrix and with a period equal to the given number. This paper answers the question by showing that the period-specific realization problem has a solution if and only if the given weighting pattern matrix is separable and has a period equal to the given positive real number. To this end, two types of period-specific realizations are constructed. One is with a constant A-matrix whose dimension is not necessarily minimal among all possible period-specific realizations. The other is with a non-constant and periodically time-varying A-matrix whose dimension turned out minimal among all possible period-specific realizations. © 2013 Elsevier B.V. All rights reserved.
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Study of Power Gneneration By Using Capacitor 査読あり
Takuya Hirata, Ichijo Hodaka, Masanori Ushimizu
Proceedings of the 12th International Conference on Electronics, Hardware, Wireless and Optical Communications (EHAC '13) 2013年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Control of PWM on A Switching Circuit for Maximum Power Point Tracking 査読あり
Masanori Ushimizu, Ichijo Hodaka
Proceedings of the 12th International Conference on Electronics, Hardware, Wireless and Optical Communications (EHAC '13) 2013年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Estimation of Coupling Coefficient for Wireless Power Transfer 査読あり
Kazuya Yamaguchi, Ichijo Hodaka, Yuta Yamamoto
Recent Advances in Circuits, Communications and Signal Processing 2013年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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A Practical Method to Diagnostics for DC-DC Converter By System Identification Approach 査読あり
Yuta Yamamoto, Ichijo Hodaka, Kazuya Yamaguchi
Recent Advances in Circuits, Communications and Signal Processing 101 - 104 2013年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Improvement of maximum power point tracking based on nonlinear control of boost converter 査読あり
Setiawan E., Hodaka I., Yamamoto Y., Jikuya I.
Proceedings of 2012 IEEE Conference on Control, Systems and Industrial Informatics, ICCSII 2012 180 - 184 2012年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Proceedings of 2012 IEEE Conference on Control, Systems and Industrial Informatics, ICCSII 2012
A Maximum Power Point Tracking (MPPT) is commonly applied in photovoltaic system in order to harvest the maximal power. One of the widely used MPPT techniques is socalled Perturb and Observe (P & O). However, P & O MPPT has a shortage on operating point swinging around maximum power point (MPP), where one can never achieve a MPP. In order to reduce the shortage, new nonlinear control is presented. The proposed control is applied for boost converter which is commonly used in photovoltaic system. The controller is designed based on state-space averaging and nonlinear control theory. In the experiment, the proposed controller is implemented in a real circuit that utilizes solar array simulator to displace the photovoltaic module. Experiment result shows that the proposed method can suppress the oscillation of MPPT. © 2012 IEEE.
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Symbolic Analysis of Maximizing Efficiency of Photovoltaic Power Generation Circuits 査読あり
Eko Setiawan, Ichijo Hodaka, Yuta Yamamoto
Proceedings of 11th WSEAS Int. Conf. on SYSTEM SCIENCE and SIMULATION in ENGINEERING (ICOSSSE '12) 2012年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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System Identification Approach to Diagnostics for Switching Circuits 査読あり
Yuta Yamamoto, Ichijo Hodaka, Eko Setiawan
Proceedings of 11th WSEAS Int. Conf. on SYSTEM SCIENCE and SIMULATION in ENGINEERING (ICOSSSE '12) 2012年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 18 ( PART 1 ) 1307 - 1312 2011年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IFAC Proceedings Volumes (IFAC-PapersOnline)
This note discusses the steady state response of a linear periodic system with a periodic input, especially for linear systems with periodic and piecewise continuous coefficients. The first order approximation of the steady state response with respect to the period of time is obtained for general linear periodic systems. This result is then applied to analyze the buck-boost converter operating in continuous conduction mode. This mathematically clarifies conventional results of switching converters which have been deduced under physical inspections or assumptions. © 2011 IFAC.
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On the Klimushchev–Krasovskii theorem 査読あり
Ichiro Jikuya, Ichijo Hodaka
Automatica 47 ( 10 ) 2323 - 2325 2011年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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An Explicit Parametrization of the Set of All Solutions to Linear Periodic Systems 査読あり
Ichiro Jikuya, Ichijo Hodaka
Proceedings of The 19th International Symposium on Mathematical Theory of Networks and Systems (MTNS 2010) 2010年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Maximum parametrization of the set of all solutions to linear periodic systems 査読あり
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 4 ( PART 1 ) 7 - 11 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IFAC Proceedings Volumes (IFAC-PapersOnline)
In the Floquet representation theorem, a state transition matrix whose second argument is 0 is represented as a product of a real-valued periodic matrix function and a real-valued matrix exponential function. In contrast, we have proposed a novel representation as a product of a real-valued periodic matrix function and two real-valued matrix exponential functions. In this note, the structure of the previously proposed representation is intensively investigated in terms of the maximum parametrization. © 2010 IFAC.
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A floquet-like factorization for linear periodic systems 査読あり
Jikuya I., Hodaka I.
Proceedings of the IEEE Conference on Decision and Control 6432 - 6437 2009年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of the IEEE Conference on Decision and Control
In this note, the novel representation is proposed for a linear periodic continuous-time system with T-periodic real-valued coefficients. We prove that a T-periodic real-valued factor and two real-valued matrix exponential functions can be extracted from a state transition matrix, while, in the wellknown Floquet representation theorem, a 2T-periodic real-valued factor and a real-valued matrix exponential function are extracted from the state transition matrix. Then we also proved that any T-periodic system can be transformed to a system with T-periodic real-valued trigonometric coefficients using a T-periodic real-valued coordinate transformation, while, in the well-known Lyapunov reducibility theorem, a 2T-periodic real-valued coordinate transformation is utilized to transform the given periodic system into a time-invariant system with real coefficients. This new information can be useful for designing a T-periodic control law. ©2009 IEEE.
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電気二重層キャパシタ充電回路の制御
穂高一条，永松和也
宮崎大学工学部紀要 ( 38 ) 165 - 172 2009年9月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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磁気トルカを用いた小型衛星の姿勢制御の可制御性について
穂高一条，渡邉泰三
宮崎大学工学部紀要 ( 38 ) 173 - 180 2009年9月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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太陽電池・電気的特性シミュレータの開発
穂高一条，平井大雅
宮崎大学工学部紀要 ( 38 ) 189 - 194 2009年9月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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太陽光発電のためのNi-MH電池充電回路の制御
穂高一条，輝直樹
宮崎大学工学部紀要 ( 38 ) 181 - 188 2009年9月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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A period-specific realization of linear continuous-time systems 査読あり
Hodaka I., Jikuya I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 17 ( 1 PART 1 ) 2008年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IFAC Proceedings Volumes (IFAC-PapersOnline)
It is a well-known fact that a weighting pattern matrix is realizable as a linear periodic system if and only if the matrix is separable and periodic. This fact, however, can not cope with a reasonable question when a weighting pattern matrix can be realized as a linear periodic system with a specific period of time. This paper answers the question by constructing two types of period-specific realizations. Moreover, this paper describes in detail how the lowest dimension of period-specific realizations is identified. Copyright © 2007 International Federation of Automatic Control All Rights Reserved.
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連続時間線形周期システムの Kalman 正準分解に関する一考察 : システムの倍周期での状態空間の可制御・不可制御部分への分解 査読あり
軸屋 一郎, 穂高 一条
計測自動制御学会論文集 44 ( 8 ) 692 - 694 2008年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：計測自動制御学会
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A Period-Specific Realization of Linear Continuous-Time Systems 査読あり
I. Hodaka, I. Jikuya
Proceedings of the 17th IFAC World Congress 1287 - 1292 2008年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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連続時間線形周期システムのKalman正準分解に関する一考察:システムの倍周期での状態空間の可制御・不可制御部分への分解 査読あり
軸屋 一郎, 穂高 一条
計測自動制御学会論文集 44 ( 8 ) 692 - 694 2008年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：The Society of Instrument and Control Engineers
Although it was shown in our previous paper that canonical periodic decomposition with the same period of a given linear periodic continuous-time system is invalid in general, it is shown here that decomposition with the double period is valid without any exception.
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穂高 一条, 軸屋 一郎
計測自動制御学会論文集 44 ( 4 ) 302 - 308 2008年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：The Society of Instrument and Control Engineers
This paper develops the realization theory for linear periodic continuous-time systems. The substantial difficulty in the period-specific realization problem is that there may be no solution among linear periodic systems whose dimensions are equal to the order of a given weighting pattern matrix, in sharp contrast with realization problems for general linear time-varying systems or linear time-invariant systems. This paper proves the existence of period-specific realizations even when there exists no realization with dimension equal to the order of the weighting pattern matrix. It is finally shown that the realizations obtained in this paper have a <I>minimal</I> dimension among all of possible realizations with a specific period of time.
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穂高 一条, 軸屋 一郎
計測自動制御学会論文集 43 ( 12 ) 1090 - 1096 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：計測自動制御学会
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On Kalman canonical decomposition of linear periodic continuous-time systems with real coefficients 査読あり
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 3 ( PART 1 ) 257 - 262 2007年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IFAC Proceedings Volumes (IFAC-PapersOnline)
In this note, structural decomposition of linear periodic continuous-time systems is discussed. A fundamental problem to decompose a state of a periodic system into controllable and uncontrollable parts is conjectured to be achieved by a continuously differentiable and periodic coordinate transformation with the same period of the system, however there is a counterexample to this conjecture. Hence we derive a condition for the existence of such a coordinate transformation. We also prove that, by relaxing a class of coordinate transformation, it is always possible to construct a periodic coordinate transformation with the double period of the periodic system.
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連続時間線形周期システムのKalman正準分解に関する一考察 - システムと同じ周期での状態空間の可制御・不可制御部分への分解 査読あり
軸屋一郎・穂高一条
計測自動制御学会論文集 43 ( 10 ) 892 - 900 2007年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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On Kalman Canonical Decomposition of Linear Periodic Continuous-Time Systems with Real Coefficients 査読あり
I. Jikuya, I. Hodaka
Preprints of 3rd IFAC Workshop ``Periodic Control Systems'' PSYCO 2007 (CD-ROM) 2007年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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連続時間線形周期システムの可制御・不可制御部分への分解可能性について 査読あり
穂高一条・軸屋一郎
計測自動制御学会論文集 43 ( 3 ) 239 - 241 2007年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Hodaka I., Jikuya I.
WSEAS Transactions on Systems 6 ( 1 ) 32 - 39 2007年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：WSEAS Transactions on Systems
This paper proposes an explicit formula for designing a periodic state feedback control law for a class of linear periodic continuous-time systems. The proposed control law sufficiently raises the frequency of a periodic coefficient matrix of a resultant closed-loop system so that the closed-loop system is exponentially stabilized, which is proved by introducing an averaging technique with quantitative evaluation. This enables closed-loop characteristic multipliers to converge to desired place, which are arbitrarily specified by the pole placement design for an averaged linear time-invariant system. The effectiveness of the proposed control law is demonstrated in a numerical example of attitude control of small satellites with magnetic actuator.
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Jikuya I., Hodaka I.
WSEAS Transactions on Systems 6 ( 1 ) 1 - 8 2007年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：WSEAS Transactions on Systems
This paper presents a geometric interpretation of stabilizability of linear periodic continuous-time systems, which is an extension of the well-known geometric approach for linear time-invariant systems. Although the existence of linear periodic state feedback with the same period of the system has been discussed in the conventional results, we admit a broader class and discuss a periodic state feedback with a twice period of a system (briefly double periodic state feedback) in order to derive a stabilizability condition in the coordinate free setting. For this end, stable, unstable and reachable subspaces in the state space for linear periodic systems are introduced. It will be shown that those subspaces are spanned by a smooth and doubly periodic basis and are invariant with respect to the fundamental solution. With these notions, it will be proven that a linear periodic system is stabilizable by doubly periodic state feedback if and only if the unstable subspace is contained in the reachable subspace, which is a well-known fact for linear time-invariant case.
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A Geometric Characterization of Stabilizability by Double Periodic State Feedback for Linear Periodic Continuous-Time Systems 査読あり
I. Jikuya, I. Hodaka
WSEAS Transactions on Systems 6 ( 1 ) 1 - 8 2007年1月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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A Periodic State Feedback Control Law by Raising Frequency for a Class of Linear Periodic Continuous-Time Systems 査読あり
I. Hodaka, I. Jikuya
WSEAS Transactions on Systems 6 ( 1 ) 32 - 39 2007年1月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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穂高 一条, 軸屋 一郎
計測自動制御学会論文集 43 ( 12 ) 1090 - 1096 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：The Society of Instrument and Control Engineers
This paper presents a new insight into controllability for linear periodic continuous-time systems. A number of necessary and sufficient conditions for linear periodic systems to be controllable have been proposed in mutually different forms. However, it is common for these conditions to be described in terms of input coefficients and fundamental solution matrices or transition matrices of the systems. On the other hand, more convenient controllability criterions such as PBH test are available for linear time-invariant systems: the criterions can be described by system matrices in the state-space representations instead of fundamental solution matrices. The purpose of this paper is to derive a controllability criterion in terms of system matrices for linear periodic systems in parallel with the case of linear time-invariant systems. To be precise, this paper proves the existence of <I>particular</I> state-space representations where controllability can be checked directly through system matrices.
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Stabilizability of Linear Periodic Continuous-Time Systems by Double Periodic State Feedback 査読あり
I. Jikuya, I. Hodaka
Proceedings of the 2nd WSEAS International Conference on Dynamical Systems and Control (CR-ROM) 2006年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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A Periodic State Feedback Control Law for a Class of Continuous-Time Linear Periodic Systems 査読あり
I. Hodaka, I. Jikuya
Proceedings of the 2nd WSEAS International Conference on Dynamical Systems and Control (CD-ROM) 2006年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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線形周期係数システムに対する周期指定の実現問題 査読あり
穂高一条
計測自動制御学会論文集 42 ( 7 ) 806 - 813 2006年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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A New Geometric Characterization of Stabilizability for Linear Periodic Continuous-Time Systems 査読あり
I. Jikuya, I. Hodaka
Proceedings of 17th International Symposium on Mathematical Theory of Networks and Systems 2928 - 2933 2006年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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特異摂動システムの漸近安定性に対する必要条件について 査読あり
穂高一条
計測自動制御学会論文集 42 ( 6 ) 701 - 703 2006年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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高周波化制御による漸近的な特性乗数配置 査読あり
軸屋一郎・穂高一条
計測自動制御学会論文集 42 ( 5 ) 475 - 482 2006年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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高周波化フィードバックによる線形周期係数システムの特性乗数配置 査読あり
穂高一条・軸屋一郎
計測自動制御学会論文集 42 ( 5 ) 551 - 558 2006年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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On the Use of the Averaging Method for the Characteristic Multiplier Placement Problem 査読あり
I. Jikuya, I. Hodaka
Proceedings of the 44th IEEE Conference on Decision and Control, 2005 and 2005 European Control Conference 7870 - 7875 2005年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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On the use of the averaging method for the characteristic multiplier placement problem 査読あり
Jikuya I., Hodaka I.
Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05 2005 7870 - 7875 2005年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05
This paper proposes a novel approach for designing a periodic state feedback control law for a class of continuous-time linear periodic systems. The control law generates the sufficiently high frequency sinusoidal in the coefficient of the closed loop systems, then the closed loop solution is shown to be exponentially stable based on the averaging method. It is also shown that the closed loop solution is approximated by the solution of the average system. © 2005 IEEE.
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A Periodic Feedback Control Strategy of Magnetic Torquers in Satellite Attitude Control Problems 査読あり
M. Ando, I. Hodaka
Proceedings of Gyeongnam-Tokai Special Sessions in 2005 JSASS-KSAS Joint International Symposium on Aerospace Engineering (CD-ROM) 2005年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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飛行機縦運動の自動操縦系統設計における減衰比と固有振動数の指定について-特異摂動法に基づくアプローチ 査読あり
軸屋一郎・穂高一条
日本航空宇宙学会論文集 53 ( 615 ) 147 - 153 2005年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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連続時間・線形周期係数システムの高周波化フィードバック制御 査読あり
穂高一条・軸屋一郎
計測自動制御学会論文集 40 ( 10 ) 1054 - 1059 2004年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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A Flat-plate Wings Model for the Longitudinal Motion of Airplanes 査読あり
Y. Sunaga, I. Hodaka
Proceedings of 4th Gyeongnam-Tokai Aerospace Technology Symposium 206 - 211 2003年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Attitude and Vibration Control of Space Structures Using Two Actuators 査読あり
B. Xu, I. Hodaka, M. Suzuki
Transactions of the Japan Society for Aeronautical and Space Sciences 46 ( 151 ) 1 - 6 2003年5月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Attitude and vibration control of space structures using two actuators 査読あり
Bo X., Hodaka I., Suzuki M.
Transactions of the Japan Society for Aeronautical and Space Sciences 46 ( 151 ) 1 - 6 2003年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Transactions of the Japan Society for Aeronautical and Space Sciences
In this paper, we propose a control design method to suppress flexible appendage vibration while controlling the attitude motion of space structures simultaneously using two different actuators; one a "slow" actuator, and the other a "fast" actuator. Because the frequency of flexible appendage vibration is much higher than that of attitude motion, this system naturally exhibits a two-time-scale dynamic behavior. After describing this system as a singularly perturbed system, the control laws of each subsystem were determined to have the following properties: the slow actuator only controls the attitude motion of space structures, and the fast actuator only suppresses flexible appendage vibration. A composite state feedback control is obtained by combining the slow subsystem and fast subsystem control laws. Simulation results are presented to show the effectiveness of this control design method.
DOI： 10.2322/tjsass.46.1
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A Pole Assignment Method for Two-Time-Scale Systems in Controlling Longitudinal Motion of Airplane 査読あり
I. Hodaka, M. Suzuki
Proceedings of the ICASE/SICE Joint Workshop 77 - 78 2002年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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非線形特異摂動システムに対する動的な合成制御則 査読あり
穂高一条・鈴木正之
計測自動制御学会論文集 37 ( 10 ) 934 - 943 2001年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Attitude and Vibration Control of Space Structures by Singular Perturbation Approach 査読あり
B. Xu, I. Hodaka, M. Suzuki
Proceedings of the 5th WSEAS International Multi-Conference on Circuits, Systems, Communications and Computers 195 - 199 2001年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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特異摂動システムの安定化とロバスト安定性 査読あり
穂高一条・鈴木正之
計測自動制御学会論文集 36 ( 9 ) 757 - 765 2000年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Stabilization and Robust Stability of Singularly Perturbed Systems 査読あり
I. Hodaka, M. Suzuki
Preprints of 3rd IFAC Symposium on Robust Control Design 36 ( 9 ) 757 - 765 2000年6月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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New results for strict positive realness and feedback stability 査読あり
I. Hodaka, N. Sakamoto, M. Suzuki
IEEE Transactions on Automatic Control 45 ( 4 ) 813 - 819 2000年4月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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New results for strict positive realness and feedback stability 査読あり
Hodaka I., Sakamoto N., Suzuki M.
IEEE Transactions on Automatic Control 45 ( 4 ) 813 - 819 2000年4月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE Transactions on Automatic Control
This paper proposes an algorithm which enables the authors to characterize positive realness and three different classes of strict positive realness in terms of Riccati equations and inherent integrations. It has been an open question whether or not the feedback system consisting of a weakly strict positive realness and a nonlinear passivity is asymptotically stable. This paper also shows that the statement is indeed the case.
DOI： 10.1109/9.847128
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安定余裕を指定した部分極配置-多項式ILQ法の拡張- 査読あり
佐藤淳・穂高一条・杉本謙二
システム制御情報学会論文誌 13 ( 1 ) 30 - 37 2000年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Partial Pole Placement with Specified stability margins 査読あり
A. Satoh, I. Hodaka, K. Sugimoto
Proceedings of the 38th IEEE Conference on Decision and Control 2 1389 - 1390 1999年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Partial pole placement with specified stability margins 査読あり
Satoh A., Hodaka I., Sugimoto K.
Proceedings of the IEEE Conference on Decision and Control 2 1389 - 1390 1999年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of the IEEE Conference on Decision and Control
This paper proposes a design method for state feedback control law which simultaneously ensures specified stability margins and partial pole placement. This design problem is reduced to a feasibility problem with LMI constraints and a non-linear equality constraint.
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開ループシステムの消散性に基づくロバスト制御 査読あり
穂高一条・鈴木正之・坂本登
システム制御情報学会論文誌 12 ( 9 ) 549 - 557 1999年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Loopshaping by Quadratic Constraints on Open-Loop Transfer Functions 査読あり
I. Hodaka, M. Suzuki, N. Sakamoto
Learning, Control and Hybrid Systems, Springer Lecture Notes in Control and Information Sciences 241 416 - 431 1999年5月
記述言語：英語 掲載種別：研究論文（その他学術会議資料等）
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指定されたゲイン余裕と位相余裕を確保するコントローラの設計 査読あり
穂高一条・鈴木正之・坂本登
計測自動制御学会論文集 35 ( 4 ) 577 - 579 1999年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Robust Control Design with Specified Gain and Phase Margins and Its Applications 査読あり
I. Hodaka, M. Suzuki, M. Itoh
Proceedings of the Mathematical Theory of Networks and Systems Symposium 189 - 192 1998年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Output Feedback Control with Specified Gain and Phase Margins 査読あり
I. Hodaka, N. Sakamoto, M. Suzuki
Proceedings of IEEE Singapore International Symposium on Control Theory and Applications 152 - 155 1997年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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疑似強正実条件による受動定理 査読あり
穂高一条・鈴木正之
計測自動制御学会論文集 32 ( 8 ) 1183 - 1189 1996年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌）