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Surge Analysis on a Long Underground Cable System
Kawamura, Kazuki,Ametani, Akihiro,Gudmundsdottir, Unnur Stella The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.2
This paper investigates a basic characteristic of fault surge in a long cable system based on EMTP simulations. It is made clear from the simulation results that the sheath over-voltage is higher on a cross-bonded cable than that on a normal-bonded cable. Also, a resonant overvoltage appears when cables with shunt reactors are disconnected. It becomes clear that the period of the beat becomes long as the compensation rate increases. From simulations with earth continuity conductor (ECC), the ECC is effective to reduce an overvoltage in the case of a fault at an overhead line connected to the cable.
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.
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.
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).
日本語學習のためのインタ―ネット活用術 -自律學習で語彙力を高めるには-
( Kawamura Yoshiko ) 한국일어교육학회 2012 일본어교육연구 Vol.0 No.23
This paper reports on the application of Information and Communication Technology (ICT) to Japanese language education. We have already developed a reading tutorial system called Reading Tutor, and a multi-lingual Japanese dictionary system called Reading Tutor``s Web Dictionary. These systems are available on line, and offer a learning environment on the Web for Japanese language learners. Using these systems, Japanese language teachers are also able to develop educational materials. In this paper, we introduce how to use the tutorial tools for Japanese language learning, and then how to develop educational materials. The materials reported on here are aimed specifically at foreign care works. This could be referred to as JSP, Japanese for Specific Purposes. Foreign care workers who come to Japan as part of EPA (economic partnership agreement) are tasked with successful completion of the national certificate examination within four years after they begin working at Japanese care facilities. Experts in the field point to the need for specifically designed study materials and effective methodology to learn. In order to meet this requirement, Reading Tutor``s Web Dictionary has incorporated multi-lingual mini-dictionaries containing lexical items specific to the care worker industry as part of this need. As the next step, we have built learning materials specifically for care workers studying for the national examination. This paper will explain the nature of the tools used to develop this material and the steps taken to develop appropriate materials. This explanation will be followed by suggestions for changes in teaching methodology to complement the use of Web based material. It is our sincere wish that both the materials and teaching methodology introduced here will positively affect Japanese language education in general, and more specifically, Japanese for specific purpose education.