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Mechatronics Education Using Robot Competition in Okayama University of Science
Akagi, Tetsuya,Fujimoto, Shinsaku,Kuno, Hiroaki,Araki, Keisuke,Yamada, Satoshi,Dohta, Shujiro Korean Society for Engineering Education 2010 공학교육연구 Vol.13 No.2
Electronics machines make daily human life more convenient and comfortable and try to ease burdens. When designing and manufacturing such mechatronic systems, the engineers need to have a wide range of knowledge. The purpose of our education is for students to learn to use mechatronic techniques. To realize our goal, we regard "an interest in creation" of our student as an important educational method. In this paper, we propose and try an educational method for mechatronics creation using "their interest". The method is to hold robot competitions between 1st and 3rd year students as a regular curriculum. In order to confirm the progress of our students in our engineering course, in the last year, some students entered the Rescue Robot Contest held in Kobe Japan. As a result, our student team got second place, a great honor considering it was our first attempt. We confirm that the robot competition is a useful method to make students study by themselves.
Self evaluation for gait based on optical flow calculation
Ryo Akagi,Teruo Yamaguchi 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Walking is an activity that can be practiced by almost all people, and it has the effect of preventing diseases and unhealthy conditions that are increasing in many people. If we can walk efficiently, it is expect to reduce the burden on the body and improve our motor skills. At present, it is common for experienced and knowledgeable instructors to evaluate gait in walking, but it is not certain that the evaluation is always objective, and it is time-consuming and costly. Therefore, we expected that if we can analyze the ideal gait and compare our own gait with the ideal gait. we would be able to evaluate how our own gait is close to the ideal gait in a simple way. In this study, to analyze the ideal gait, we measure the head velocity and acceleration of the ideal gait captured by a high-speed camera and compared it with the non-ideal gait using optical flow measurement.
Ground-state Phase Diagram of the Kondo Lattice Model on Triangular-to-kagome Lattices
Yutaka Akagi,Yukitoshi Motome 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We investigate the ground-state phase diagram of the Kondo lattice model with classical localizedspins on triangular-to-kagome lattices by using a variational calculation. We identify the parameterregions where a four-sublattice noncoplanar order is stable with a finite spin scalar chirality whilechanging the lattice structure from triangular to kagome continuously. Although the noncoplanarspin states appear over a wide range of parameters, the spin configurations on the kagome networkbecome coplanar as approaching the kagome lattice; eventually, the scalar chirality vanishes for thekagome lattice model.
A Combined System of a Shunt Passive Filter and a Small Rated Series Active Filter
Hnofunm Akagi 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
This paper describes an approach to harmonic compensation in industrial power systems This consists of a conventional passive filter and a small rated series active filter using three single-phase voltage-source PWM inverters The function of the senes active filter is not to compensate for harmonic currents generated by a, load, but to eliminate all the problems faced by using only llu shunt passive filtei This results in a great conduction of the rating of tlie scries active filter, leading to a practical and economical filter sysem.<br/> A prototypt. model is constancted and tested, where a three phase thynstor bridge converter of rating 20kVA is used as an tx.?nplc of hamnoine generators. As a result, good filtering characteristics are verified by the experiment, which could not be obtainedby the shunt pasiive filter used alone.<br/>
Mechatronics Education Using Robot Competition in Okayama University of Science
T. Akagi,S. Fujimoto,H. Kuno,K. Araki,S. Yamada,S. Dohta 한국공학교육학회 2010 공학교육연구 Vol.13 No.2
Electronics machines make daily human life more convenient and comfortable and try to ease burdens. When designing and manufacturing such mechatronic systems, the engineers need to have a wide range of knowledge. The purpose of our education is for students to learn to use mechatronic techniques. To realize our goal, we regard “an interest in creation” of our student as an important educational method. In this paper, we propose and try an educational method for mechatronics creation using “their interest”. The method is to hold robot competitions between 1st and 3rd year students as a regular curriculum. In order to confirm the progress of our students in our engineering course, in the last year, some students entered the Rescue Robot Contest held in Kobe Japan. As a result, our student team got second place, a great honor considering it was our first attempt. We confirm that the robot competition is a useful method to make students study by themselves.
Present State and Future Trends of Active Power Filters in Japan
Hirofumi Akagi,Noriyuki Watanabe 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
With remarkable development and advance in PWM inverter technology on the basis of fast switching devices in the 1980s, active power filters which are classified into shunt and series active filters have been studied with the focus on their practical installation in industrial power systems. In 1982, a shunt active filter of rating 800kVA was put into practical use for the first time in the world. The main circuit consisted of a current source PWM inverter using GTO thyristors. In 1986, a combined system of a shunt active filter of rating 900kVA and a shunt passive filter of rating 6600kVA was practically installed to suppress the harmonics produced by a large capacity cycloconverter for steel mill drives.<br/> More than one hundred shunt active filters have been operating properly in Japan. The largest one of the shunt active filters is 20MVA, which was developed in 1990 for reactive power and harmonic compensation for an arc furnace with the help of a shunt passive filter of 20MVA.<br/> This paper presents a survey of shunt and series active filters using PWM inverters, paying attention to research and practical applications in Japan.<br/>