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구연 / 제 1 회의장 / 위장관 2 : 인두 및 후두 증상이 있는 환자에서 상부식도 이소성 위점막 유무에 따른 보행성 24 시간 식도 산도검사의 비교
김은아(E . A . Kim),강동훈(D . H . Kang),조해석(H . S . Cho),박동균(D . K . Park),김선숙(S . S . Park),박종재(S . S . Park),최덕주(J . J . Choi),박현철(D . J . Park),구양서(H . C . Koo),김주현(J . H . Kim) 대한소화기학회 1999 대한소화기학회 추계학술대회 Vol.1999 No.-
Micro V-Groove 가공시 단결정 다이어몬드 공구의 마멸
박동삼(D. S. Park),한진용(J. Y. Han),윤대진(D. J. Yoon),장호수(H. S. Jang) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Fine microgroove is the key component to fabricate micro-grating, micro-grating lens and so on. Conventional groove fabrication methods such as etching and lithography have some problems in efficiency and surface integrity. Therefore, mechanical micromachining methods using single crystal diamond tools is expected to be very efficient, and widely studied. This study deals with tool wear characteristics in the creation of micro V-grooves of electroless nickel coated plate using non-rotational single crystal diamond tool and 3-axis micro stages. For the analysis of tool wear characteristics in micro V-grooving, 3 dimensional images of tool tip are measured using noncontact type 3 dimensional shape measurement system.
다이어몬드 공구를 이용한 Ni 도금층의 Micro V-Groove 가공
박동삼(D. S. Park),윤대진(D. J. Yoon),장호수(H. S. Jang) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Fine microgroove is the key component to fabricate micro-grating, micro-grating lens and so on. Conventional groove fabrication methods such as etching and lithography have some problems in efficiency and surface integrity. Therefore, mechanical micromachining methods using single crystal diamond tools and ultraprecision machine tools are expected to be very efficient, and widely studied. This study deals with creation of ultra-precision micro V-grooves of nickel plated layer using non-rotational single crystal diamond tool and 3-axis micro stages. Micro V-groove shape and chip formation were investigated for the analysis of machinability of Ni plated layer.
박동성(D.-S. Park),주재준(J.-J. Joo),문경모(K.-M. Moon),장용복(Y.-B. Chang),박영민(Y.-M. Park),김남원(N.-W. Kim),이현정(H.-J. Lee),곽상우(S.-W. Kwag),송낙형(N.-H. Song),우인식(I.-S. Woo),양형렬(H.-L. Yang) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Korea Superconducting Tokamak Advanced Research (KSTAR) was constructed for Korean fusion research and has been operated successfully since 2008. Different from other tokamak devices, KSTAR is fully superconducting (SC) magnet tokamak which consists of 30 magnets and is made of Nb₃Sn and NbTi superconductor. To reach appropriate operating condition of the KSTAR SC magnets, the magnets temperature should be cooled down to liquid helium temperature. A Helium Refrigeration System(HRS) with an exegetic equivalent cooling power of 9㎾ at 4.5K is dedicated to cool down and keep the KSTAR SC magnets in cryogenic temperature. Since the commissioning period and the first campaign of KSTAR, the HRS has showed sufficient performance for the KSTAR SC magnets operation. The estimated time of cool-down for KSTAR cold components was 30 days, but the KSTAR SC magnets were reached to cryogenic temperature in 23 days at the first cool-down operation. Due to the long period of the KSTAR campaign, the reliable operation of the HRS is as important as its performance. During the past 4 years of campaign, the abnormal events were occurred several times and they were influenced to the reliability of the KSTAR HRS and the system availability was decreased. This paper will present the operation result of the KSTAR HRS since the first campaign and the record of the abnormal events and reliability will be discussed.