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Maeda, Tetsuhiko,Nishida, Keiichi,Hasegawa, Yasuo,Kawakami, Yoshiaki,Masuda, Masao The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
Authors have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for load leveling and stabilizing the grid system. THEUS consists of fuel cells, water electrolyzers, hydrogen storage and their auxiliary machinery. The basic operation for load leveling is as follows: In the nighttime, it produces hydrogen through water electrolysis by using low-cost electric power and stores the hydrogen. In the daytime, it conducts fuel cell generation using the stored hydrogen to meet the demand. Hydrogen storage equipment is the core of THEUS. In this paper, the metal hydride tank was chosen as hydrogen storage. The hydrogen desorption process is endothermic reaction. It is possible to use the cool heat for air conditioning. It is necessary to develop a useful numerical simulation code for not only the operation method but also the optimization of the structure of the tank. We developed the simulation code. The validity of the code has been improved by comparing with experimental results. Concretely, the following points were considered. (1)The thermal capacity of the tank. (2)Heat loss to the outside. (3)The copper plate effect. The simulation results become in good agreement with experimental results. And to achieve hydrogen high flow rate, new design tank performance was investigated.
신장성 수축 운동이 근력 발현 최적 길이에 미치는 영향
이해동(Lee Hae Dong),김승재(Kim Seung Jae),Kawakami Yasuo,이대연(Lee Dae Yeon),이중현(Lee Jung Hyun),권순국(Kwon Soon Kuk),이영신(Lee Young Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The purpose of this study was to investigate shift in optimum length following unaccustomed eccentric exercise for human tibialis anterior in-vivo. It was observed that the optimum ankle joint angle changed by 3° following 120-repetition eccentric platarflexion contractions with subject's (n = 11) maximum effort. This observation supports the idea that the increased compliance of the muscle due to micro muscle damage is responsible for the observed shift of the optimum joint angle.
신장성 수축 운동에 의한 인체 하지 전경골근의 족배굴곡 토크-발목 각도 특성 변화
이해동(Lee Hae-Dong),김승재(Kim Seung-Jae),야수오 카와카미(Yasuo Kawakami) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The purpose of this study was to investigate how maximum-effort eccentric exercise over different contraction ranges affects the characteristics of torque-angle relationship of human ankle plantarflexor in-vivo. Subjects were randomly assigned in two groups. One group (n=6) performed 120 maximum-effort eccentric ankle dorsiflexion contractions at short muscle length (ankle range of motion from -5 to 15 deg) and the other group (n=6) at long (ankle range of motion from 10 to 30 deg) muscle length. Eccentric exercise decreased the maximum isometric ankle plantarflexion torque ~40%. It was found that the optimum ankle joint angle changed from 7.5 deg to 11.1 deg and 10.1 deg, shifted toward the longer muscle length, regardless of the exercise range. The results of this study suggest that eccentric exercise alters the characteristics of torqueangle relationship of the muscle but there is no differential effect of the eccentric contraction range.