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전도냉각형 고온초전도 Wire의 전류도입부에서의 열적 퀜치
배준한,배덕권,박해용,손명환,성기철,Bae, Joon-Han,Bae, Duck-Kweon,Park, Hae-Yong,Shon, Myung-Hwan,Seong, Ki-Chul 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
The heat generation in the high-$T_c$ superconducting (HTS) wire is related with the cost efficiency and safe factor of HTS devices. This paper deals with the thermal quench at the conduction-cooled joint between HTS wire and copper terminals. The 3-D numerical simulation of thermal distributions in part of the copper terminals was implemented and the premature quench at copper block was observed through the test. The results will be helpful to design the conduction-cooled HTS magnets.
裵俊漢(Joon-Han Bae),成耆哲(Ki-Chul Seong) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
We designed and manufactured a 1.8T high temperature superconducting (HTS) insert coil for a NMR magnet operated at 4.2 K. Suitable HTS superconductor and HTS coil were carefully designed and developed. We have selected multi-filamentary Bi2223 conductor fabricated by American Superconductor Corporation(AMSC). The selected conductor consists of Bi2223 filaments of 55, silver stabilizer and stainless steel reinforcement tapes. Therefore, it shows good hoop strength as well as compression tolerance. The conductor has a tape cross-section of 0.31㎜×4.8㎜. the Bi2223 conductor shows large anisotropy of critical current. The critical current of conductor in magnetic field parallel to the flat surface are much higher than that in magnetic field perpendicular, The HTS coil has an inner diameter of 78 ㎜, an outer diameter of 127 ㎜ and a coil length of 600 ㎜. In this paper, the detailed design, fabrication and test results on the HTS insert coil are presented.
소프트웨어 신디사이저를 이용한 전기자동차 엔진 사운드 디자인
배준,김장영,Bae, June,Kim, Jangyoung 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.8
전기자동차는 내연기관차와 달리 엔진 소리가 거의 없고 매우 조용하여 다양한 문제를 발생시킨다. 예를 들면, 보행자들이 차가 다가오는 것을 느낄 수 없어 안전에 큰 위협이 된다. 또한 운전자는 자신의 자동차가 어느 정도 속도로 달리고 있는지 청각적으로 인식할 수 없게 된다. 이러한 문제를 해결하기 위해 전기자동차는 인위적으로 엔진소리를 만들어 재생하여야 한다. 이 논문은 기존 전기자동차의 샘플링 방식의 엔진 사운드 방식에 대해 알아보고 그 문제점을 알아본다. 향상방안으로 본 논문에서는 기존 샘플링 방식 대신 소프트웨어 신디사이저의 알고리즘을 구현하고 프로그래밍 언어를 통해 엔진 사운드를 소프트웨어적으로 구현한다. 신디사이저를 이용한 방식이 기존 샘플링 방식에 비해 우수한 성능을 가진 것으로 실험결과를 통해 입증되었다. 또한, 이러한 엔진 사운드 신디사이징을 통해 점차 보급률이 높아지고 있는 전기자동차의 안전성과 운전의 편의성, 즐거움을 줄 것으로 기대한다. Unlike diesel locomotives, electric vehicles have various issues because they have very quiet engine sound. For example, pedestrians are exposed to the dangerous electric vehicles on the road because they can not recognize the electric vehicles' sound. Moreover, the driver is unable to recognize how fast driver's car is driving at a certain speed. To solve these problems, electric cars' sound needs to be artificially implemented and played. This paper examines the problems of the previous sampling engine sound approach. In this paper, instead of using sampling sounds, we developed a novel synthesizer algorithm via programming languages as a software. In experimental results, we demonstrated and verified our proposed synthesizer's approach is superior to the previous sampling approach. In addition, through these synthesizer's approach, we highly expect the proposed synthesizer's approach will give safety, convenience and comfort to the electric vehicles' users.
고온초전도 전력케이블의 안정도 평가를 위한 교류손실에 관한 연구
裵俊漢(J.H. Bae),崔錫鎭(S.J. Choi),李相鎭(S.J. Lee),趙全旭(J.W. Cho) 대한전기학회 2007 전기학회논문지 Vol.56 No.7
In order to evaluate if the high-To superconducting(HTS) power cable is operating stably, the characteristics of the HTS power cable should be found out. The properties of HTS tapes by measuring the voltage with respect to the current can be archived. But, the HTS power cable is different from the case of HTS tapes. This method is invalid because of the electromagnetic fields caused by other HTS tapes. In this paper, the stability evaluation of the HTS cable was performed by the following procedure. First, the voltage-current characteristics of HTS tape were measured and the electromagnetic field distributions of the HTS power cable with the external magnetic field were analyzed. Second, the losses of the HTS power cable were calculated using the result of the measurement and the analysis. Finally, the stable operation of the HTS power cable was evaluated on the basis of the losses of the superconducting cable.