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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).
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.
김경민(K.M.Kim),김경회(K.H.Kim) 한국해양환경·에너지학회 2015 한국해양환경공학회 학술대회논문집 Vol.2015 No.11
본 논문에서는 실내 실험을 시행하여 화력발전소의 산업부산물인 석탄회를 이용하여 인산염제거 가능성을 검토하였다. 20 mg/l의 인산염 용액에 170 mg의 석탄회를 투입하고 24시간 후 인산염농도는 12 mg/l로 감소하였으며, pH는 6.26에서 8.45로 증가하였다. 실험결과 석탄회 1 mg당의 인산염 제거 양은 0.047 mg으로 나타났다. 이상의 결과를 통해 석탄회는 인산염을 제거할 수 있는 재료임을 확인하였다. This paper aims to examine the phosphate removal efficiency of coal ash. In experiment result, the phosphate concentration decreased from 20 mg/l to 12 mg/l in 24hours after adding coal ash. And pH increased from 6.26 to 8.45. The phosphate removal amount per 1 mg of coal ash is 0.047 mg. From the experiment results, it was confirmed that the coal ash is capable of removing phosphate.
김경민(K.M. Kim),이기연(K.Y. Lee),손동휘(D.H. Sohn),박근(K. Park) 한국소성가공학회 2010 금형가공 심포지엄 Vol.2010 No.11
In the design of the injection molding process, various parameters including mold design parameters and molding conditions should be investigated to improve the part quality. The mold temperature is the one of important process parameters that affects the flow characteristics, surface appearance, part deformation, mechanical properties, etc. Numerical analyses have been used to predict the temperature distribution of the mold under the given cooling or heating conditions. However, the conventional approaches have been performed by assuming that the mold material is a single solid even though a number of plates are assembled to construct an injection mold. In the present study, a numerical approach considering the thermal contact resistance is proposed to provide more reliable prediction of the mold temperature distribution by reflecting the heat-resistance between assembled mold plates.
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.
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.