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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.
다이어몬드 공구를 이용한 V-groove 가공시 비균질면 검출과 공구변형 해석
박동삼(D. S. Park),서태일(T. I. Seo),조명우(M. W. Cho),배종석(J. S. Bea),성은제(E. J. Seong),한진용(J. Y. Han),김건희(K. H. Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 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. This study deals with the creation of ultra-precision micro grooves using non-rotational single crystal diamond tools implemented on a 3-axis micro stage. In the case of machining with micro pattern on large surface, occur the inhomogeneous surface in the machined surface. Therefore, in this research, achieved research that presume inhomogeneous surface occurrence position through inhomogeneous surface detection algorithm. For the analysis of machining characteristics in micro V-grooving, three components of cutting forces are measured, and those are used for the calculation of tool deflection and stresses of the tool by FEM. From the results of this study, the proposed micro V-grooving technique could be successfully applied to forming the precise optical parts like prism patterns on light guide panel of TFT-LCD.