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문경모(K.M. Moon),주재준(J.J. Joo),박동성(D.S. Park),장용복(Y.B. Chang),곽상우(S.W. Kwag),송낙형(N.H. Song),이현정(H.J Lee),박영민(Y.M. Park),김남원(N.W. Kim),김세현(S.Y. Kim),우인식(I.S. Woo),양형렬(H.L. Yang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The helium refrigeration system (HRS) has been operated since the 1st KSTAR campaign in 2008. It is necessary of many efforts for the stable operation of the KSTAR HRS, because the HRS consists of many components such as the compressors, motors, turbines, pumps, valves and so on. So that reason, there had been several abnormal events on the HRS such as the oil pump failures, the turbines trip, the supercritical helium (SHe) circulator trip and the cold compressor (CC) failure until the 3rd campaign of KSTAR. Some of the abnormal events were the severe to the HRS operation and the rest of them were minor. To prevent such abnormal events, the careful maintenance jobs were performed. In this paper, the brief operation result during the 4th KSTAR campaign will be presented.
김순경(S. K. Kim),김문경(M K. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
An extensive investigation was conducted to assess the influence of steel sheet surface finish on pained surface appearance. Several kinds of textured steel sheet were painted simultaneously using advanced solvent-based luxury vehicle paint systems. Especially, the current emphasis on control of surface roughness of cold rolled steel sheet has been prompted by the automotive industry's concern with the as-painted appearance of sheet products, because the influence of such characteristics on paintability, formability and painted surface appearance is important in defining steel surface requirements for automotive industries. The results are discussed in detail with respect to 1) the influence of different steel surface textures on paint appearance, 2) the evolution of surface topography during painting, and 3) the implication of this work. 4) Painted sheet appearance is strongly affected by surface roughness and peak count of base-metal and influenced by the topographical properties of substrate, paint thickness and zinc coating variables. 5) The painted appearance of shot blast textured(SBT) and electro-discharge textured(EDT) automotive cold rolled steel sheets was determined and related to surface roughness parameters, zinc coating method, and paint thickness.
윤순현,김문경,이대희,Yoon, S.H.,Kim, M.K.,Lee, D.H. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
Heat transfer characteristics of a two-dimensional oblique impinging jet were experimentally investigated. The local heat transfer coefficients were measured by a thermochromic liquid crystal. The jet Reynolds number studied was varied from 10000 to 35000, the nozzle-to-plate distance(H/B) from 2 to 16, and the oblique angle($\alpha$) from $60^{\circ}$ to $90^{\circ}$. It was observed that the local Nusselt numbers in the minor flow region were larger than those in the major flow region at the same distance along the plate due to the higher levels in the turbulent intensity caused by more active mixing of the jet flow.
Plasma-PVD법에 의해 제작한 Zn-Mg합금 박막의 특성 분석
이경희(K. H. Lee),배일용(I. Y. Bae),김여중(Y. J. Kim),문경만(K. M. Moon),이명훈(M. H. Lee) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
(100-x)ZnㆍMg alloy films are prepared onto cold-rolled steel substrates; where x ranged from 0 to about 38 atomic %. The alloy films show microcrystalline and grain structures respectively, according to preparation conditions such as composition ratio of zinc and magnesium or gas pressures etc.. And X-ray diffraction analysis indicates not only the presence of Zn-Mg thin films with forced solid solution but also the one of MgZn₂ alloy films partly. In addition the influence of Mg/Zn composition ratio and morphology of the Zn-Mg alloy films on corrosion behavior is evaluated by electro-chemical anodic polarization tests in deaerated 3% NaCl solution. From this experimental results, all the prepared Zn-Mg alloy films showed obviously good corrosion resistance to compare with 99.99% Zn and 99.99% Mg Ingots for evaporation metal. It is thought that the Zn-Mg films with effective forced solid solution prepared by plasma enhanced PVD method, produces smaller and denser grain structure so that may improve the formation of homogeneous passive layer in corrosion environment.
2011년 KSTAR 캠페인 중 HRS 비상정지 복구 결과
주재준(J.J. Joo),문경모(K.M. Moon),박동성(D.S. Park),장용복(Y.B. Chang),곽상우(S.W. Kwag),송낙형(N.H. Song),이현정(H.J. Lee),박영민(Y.M. Park),김남원(N.W. Kim),우인식(I.S. Woo),양형렬(H.L. Yang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The KSTAR cool-down operation is divided 3 steps. One is cool down from ambient temperature to 4.5 K and another is keeping cryogenic state during the plasma experiment and the other is warm up to room temperature. During the 4th campaign of KSTAR, the Helium Refrigeration System (HRS) had been operated for 4 months. In this period, four times of the emergency shutdown (ESD) were happened due to the various reasons. The recovery process from the ESD should be different depending on the temperature of KSTAR cold system and the HRS operating status. At each phase, recovery procedure and recovery period are different.