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- 저자 : Kawamura, Yasuaki (검색결과 309 건)
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Driving Performance Experimental Analysis of Series Chopper Based EV Power Train
Kawamura, Atsuo,Guidi, Giuseppe,Watanabe, Yuki,Tsuruta, Yukinori,Motoi, Naoki,Kim, Tae-Woong The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.6
In this paper, the series chopper based power train for electric vehicle is proposed for aiming the increase of one battery charge driving distance. Both the motor test bench based experiments and the chassis dynamo based experiments are tested and then analyzed for EV driving performance that the proposed power train with SAZZ chopper and Quasi-PAM control scheme is compared with or without the series chopper. It is confirmed through two kinds of experimental analyses that the series chopper power train for EV can be useful to extend the driving distance if the high efficiency and the low weight of chopper are satisfied.
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Kawamura, Atsuo,Kim, Tae-Woong The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
The proper equivalent circuit is newly presented for electro-magnetic resonance based wireless power transfer. Based on the proposed equivalent circuit of open-ended helical antennas, the parameter identification of helical antennas can be well derived for highly efficient wireless power transfer. The well-established equivalent circuit in high frequency ranges is developed for analyzing a resonance enhanced-electromagnetic coupling helical antennas and the unknown parameters for helical antennas are identified by experiments. The effectiveness based on the proposed equivalent circuit is verified through experiments.
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Kawamura, Ken-ichi,Watanabe, Kensuke,Nigara, Yutaka,Kaimai, Atsushi,Kawada, Tatsuya,Mizusaki, Junichiro The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.2
The total conductivity and oxygen permeation in (Ce1-xZrxO2)0.9(CaO)0.1 solid solutions were measure das a function of temperature and oxygen partial pressure. Empirically, σ at given x and T was expressed essentially by σ=σo2+σeo Po2-1/4, where σo2 and σeo are constant. Applying a standard defect model in which major defects are Cace", Cece' and Vo in ideal solution, we can assign σo2 as the oxide ion conductivity decreases while the electronic conductivity increases with the increase in Zr content. Using the oxide ion and electronic conductivities thus determined, the oxygen permeation flux was calculated for respective Po2 and T conditions at which the measurements were made. The calculated values were found to agree with the observed ones.
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Rapidly Solidified Powder Metallurgy Mg-Zn-RE Alloys with Long Period Order Structure
Kawamura Yoshihito 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Mg-Zn-RE alloys had a novel lond period stacking ordered (LPO) structure. Their rapidly solidified powder metallurgy (RS P/M) alloys exhibited a combination of high strength and god ductility (tensile yield strength above 550 MPa and elongation above 5%). The LPO Mg-Zn-RE RS P/M alloys had high elevated temperature strength (tensile yield strength above 380 MPa at 473 K) and exhibited a high-strain-rate superplasticity at higher temperatures. In Japan, a national project for developing high strength LPO Mg-Zn-RE RS P/M alloys has started at 2003 for 5 years, which is founded by the Ministry of Economy, Trade and Industry (METI) of Japan. In the national project, project targets in materials performances have been achieved. The developed LPO Mg-Zn-RE RS P/M alloys exhibited higher tensile yield strength, fatigue strength and corrosion resistance than high strength aluminum alloys of extra-super-duralumin (7075-T6).
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Kawamura, K. 제어로봇시스템학회 1997 제어로봇시스템학회지 Vol.3 No.4
이 글에서는 국제적인 연구 개발 과제인 홀로닉 제조시스템에 대하여 개념, 목표와 현황과 HMS에서의 핵심 연구 내용을 기술하였다. 홀로닉 시스템의 개념은 소프트웨어 agent와 agent-based 시스템과 유사하다. 그러나, 가장 큰 차이점은 제조 공정을 조직화하여 표현하는 홀론과 홀론 조직은 부분과 전체의 관계를 더욱 잘 표시할 수 있다는 점이다. HMS 회원사에 의하여 개발되는 모델 시스템들을 통하여 HMS 개념의 중요성과 지능형 제조 시스템에 응용될 수 있다는 점이 확인될 수 있을 것이다.
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