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정태성(Tae Sung Jeong),제갈소영(Soyoung Jekal),임성현(S. H. Rhim),홍순철(S. C. Hong) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.2
Recent study shows that ordered alloy of L1₂ XPt₃ (M= V, Cr, Mn, Co, and Fe) exhibits various magnetic phases such as ferromagnetic-to-antiferromagnetic transition at the MnPt₃ surface. Moreover, it has been argued that CrPt₃, in particular, possess large magnetocrystalline anisotropy and Kerr rotation with possible violation of Hund’s rule. As such, we extend our work to thickness dependence of the magnetic structure of CrPt₃ thin film using density functional theory. Magnetic ground state of the bulk CrPt₃ turns out to be ferromagnetic (FM), where other magnetic phases such as A-type (A-AF), C-type (C-AF), and G-type antiferromagnetic (GAF) state have higher total energies than FM by 0.517, 0.591, and 0.183 eV, respectively, and magnetic moments of Cr in bulk are respectively 2.807 (FM), 2.805 (A-AF), 2.794 (C-AF) and 2.869 μ<SUB>B</SUB> (G-AF). We extend our study to CrPt₃(001) thin films with CrPtand Pt-termination. The thickness and surface-termination dependences of magnetism are investigated for 3-9 monolayers (ML), where different magnetic phases from bulk emerge: C-AF for CrPt-terminated 3ML and G-AF for Pt-terminated 5ML have energy difference relative to FM by 8 and 54 meV, respectively. Furthermore, thickness- and surface-termination-dependent magnetocrystalline anisotropies of the CrPt₃(001) films are discussed.
Graves` Disease 환자의 I 치료후 장기관찰
홍순철 ( S. C. Hong ),김영수 ( Y. S. Kim ),배성호 ( S. H. Bae ),전명흡 ( M. H. Chun ),서덕수 ( D. S. Suh ),도상희 ( S. H. Toh ) 대한내과학회 1969 대한내과학회지 Vol.12 No.9
One hundred and sixty-one cases of Graves Disease were treated with I during the period from May, 1960 to August 1968 at the Taegu Presbyterian Hospital. During follow-up periods ranging from 6 months to 8 Years, 2% of those [treated with I131 became hypot
87C196CB 마이크로 프로세서를 이용한 천연가스엔진의 엔진제어장치 개발에 관한 연구
최인영(I.Y.Choi),원문철(M.C.Won),홍순철(S.C.Hong) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The number of spark ignition engines using compressed natural gas(CNG) is increasing as the automotive air pollution problem is becoming a serious social problem. In this study, an Electronic control unit(ECU) for MPI type CNG engines is developed using Intel 87cl96CB Micro-processor. The developed system consists of ECU hardware, software program written in assembly and C language, PC monitoring system. The ECU system is tested an a 2000cc CNG engine converted from a gasoline engine, and shows promissing results on air/fuel ratio regulation, and output torque generation.<br/>
홍순철(S.C.Hong),이장희(J.H.Lee),정용일(Y.I.Jeong) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The prime power sources of the hybrid electric-engine vehicle consist of an internal combustion engine and an electric traction motor. To effectively utilize the power sources, a number of different power train configuration are possible, but, in general, fall into one of two basic categories-series and parallel type. The target of operating objectives is energy saving and exhaust gas reduction. This paper examines the pontential of hybrid electric vehicle using the parallel system. The optimization scheme for the power train control to meet these particular operating objectives is discussed.<br/>