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토카막 장치에서 자석 구조물의 조립에 관한 검토 KSTAR TF
김경민(K.M.Kim),최창호(C.H.Choi),홍권희(K.H.Hong),양형렬(H.L.Yang),유인근(I.K.Yu),허남일(N.I.Her),사정우(G.H.Kim),김학근(S.T.Kim),김근홍(H.T.Kim),김상태(J.S.Yang),김홍택(J.S.Bak),양진석(C.H.Kim),박주식(P.Z.Shick),김재호(J. Z. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
TF magnet structures are the main structural components in the KSTAR magnet systems to protect<br/> the superconducting coils from mechanical, electrical, and thermal loads. TF coil structure supports CS<br/> and PF coil system. The inter-coil structure contains adjustable shear keys and conical bolts to provide<br/> pre-loading in toroidal direction and to resist against in-plane and out-of-plane forces that are the most<br/> critical loads on the TF magnet system. The conical bolts and shear keys are specially designed to<br/> assemble easily and to provide a convenient accommodation for a good alignment. The connection plate<br/> that is one of the prototype fabrications had been manufactured to study adjustability of conical bolts<br/> and shear keys for assembly of TF coil structure. We could measure the misalignments at the keyways<br/> and conical holes with the misalignment measuring instrument.
김경민(K.M. Kim),손기헌(G.H. Son) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Complete numerical simulations are performed for boiling phenomena in water Jet impingement. The governing equations for the conservation of mass, momentum and energy are numerically solved in the liquid, vapor and air phases. The interface between phases is tracked by a level-set method which modified to include the effect of phase change at the liquid-vapor phase. The level set approach is combined with a non-equilibrium k-ε turbulent model.
CAA를 이용한 2D 원형 실린더의 원거리 소음 예측에 관한 연구
김경민(G.M. Kim),박인철(I.C. Park),고영주(Y.J. Go),최종수(J.S. Choi),김병수(B.S. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The change of a vortex-shedding characteristics causes changes in the Strouhal number, characteristics length, and acoustic pressure. It is known that the major parameters to predict the acoustic pressure are the flow velocity, the characteristic length, and the fluctuating lift coefficient. In this paper, numerical analysis of the flow field and acoustic analogy are utilized to predict the noise field about a circular cylinder by using CAA(Computational Aeroacoustics) method of a commercial code, Fluent, and the results are compared to the available experimental data.
체심정방정 구조 Fe-Co계 합금상의 합성 및 그 자기적 특성
김경민(K. M. Kim),권해웅(H. W. Kwon),이정구(J. G. Lee),유지훈(J. H. Yu) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.4
Bulk-type body-centered-tetragonal Fe-Co alloy was synthesised by utilising a conventional alloy preparation technologies, such as melting, solidification, and homogenising treatments, and its magnetic properties were investigated. In the (Fe<SUB>100−x</SUB>Co<SUB>x</SUB>)<SUB>1−y</SUB>C<SUB>y</SUB> alloy, the composition range, from which single phase body-centered-tetragonal alloy (martensite phase) was obtained, was severely limited: Co content x = 2.5, and C content y = 0.062. Tetragonality(c/a) of the synthesised body-centered-tetragonal (Fe<SUB>97.5</SUB>Co<SUB>2.5</SUB>)<SUB>0.938</SUB>C<SUB>0.062</SUB> alloy was 1.05. Magnetocrystalline anisotropy constant (K₁) of the body-centered-tetragonal (Fe<SUB>97.5</SUB>Co<SUB>2.5</SUB>)<SUB>0.938</SUB>C<SUB>0.062</SUB> alloy was measured to be 9.8 × 10⁵ J/㎥), which was 3.1 time as high as the pure iron (α-Fe).
다중스케일법을 이용한 충돌제트의 막비등현상에 대한 수치적 연구
김경민(K.M. Kim),손기헌(G. Son) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
A numerical method is presented for analysis of film boiling in free-surface jet impingement on a hot surface. The conservation equations of mass, momentum and energy are numerically solved in the liquid, vapor and air phases. The level-set formulation for tracking a liquid-gas interface is modified to include the effect of phase change. Also, to efficiently account for the very thin vapor film forming on a high-temperature wall, a simplified microscale vapor film model based on lubrication approximation is incorporated into the macroscale level-set formulation. The multiscale method is applied to investigate the film boiling characteristics in jet impingement.
주기적인 패턴 유리 기판을 사용한 비정질 실리콘 박막 태양전지의 효율 향상에 관한 연구
손찬희,김경민,김재호,홍진,권기청,Son, C.H.,Kim, K.M.,Kim, J.H.,Hong, J.,Kwon, G.C. 한국진공학회 2012 Applied Science and Convergence Technology Vol.21 No.1
본 연구에서는 주기적인 3차원 패턴이 형성된 유리기판을 사용하여 비정질 실리콘 박막 태양전지를 제작하였다. 주기적인 패턴은 일반적인 전도성 투명 산화막(TCO: Trasparent Conductive Oxide) 표면의 불규칙 패턴과 비교하여 더 효율적인 광포획을 가능하게 한다. 태양전지 제작 전 광특성 전산모사를 통하여 주기적인 패턴 유리 기판의 광학적 특성을 알아보았다. 비정질 실리콘 박막 태양전지의 제작은 PECVD를 이용하여 구면 패턴이 형성된 유리기판을 이용하여 제작되었으며, 인공 태양광 조사장치를 이용하여 제작된 태양전지의 성능 평가를 진행하였다. 태양전지 전산모사 결과와 실험 결과들을 비교 분석하여 주기적인 패턴 유리 기판을 이용한 비정질 실리콘 박막 태양전지의 효율향상 가능성을 확인하였다. We fabricated a-Si:H thin-film solar cell using the two-dimensional (2D) periodic patterned glass substrate. The use of a 3D periodic texture rather than a randomly texture at surface of TCO can result in higher short circuit current densities ($J_{sc}$). In order to analyze the optical effect of patterning glasses, ray-tracing simulations were performed. Also, p-i-n cells were deposited on patterned glasses as substrate by PECVD. UV-Vis spectroscopy, light I-V measurement were carried out for the optoelectronic characterization. The anti-reflective and light-trapping performance of patterning glass substrate was investigated by a comparison of experimental results with numerical simulations.