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노태환,강일구 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.3
The effect of low-temperature annealing on magnetic properties has been investigated in order to clarify the structural relaxation of a metal-metalloid type amorphous alloy, For amorphous Fe_(33)Ni_(50)P_(17) alloy, the saturation magnetization at T= OK was estimated to be almost not affected by annealing at 450k for 3hr indicating the little change of the neighbouring metalloid surroundings. The Curie temperature increased with In t_a kinetics for Fe_(33)Ni_(50)P_(17) alloy annealed at 400-450 K. From the composition dependence of the Curie temperature for amorphous (Fe_(1-x)Ni_x)_(83)P_(17) alloys (x=0-0.6), the increase in Curie temperature was interpreted to originate from the coupling between Fe and Ni atoms. The activation energy for the low-temperature relaxation causing the change in Curie temperature was about 1.3eV.
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Fe_(73.5)Cu₁Nb₃Si_(13.5)B_(9) 초미세 결정립 합금의 분말코아 특성
노태환,최혁열 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6
The melt-spun Fe_(73.5)Cu₁Nb₃Si_(13.5)B_(9) ribbons so called Finemet alloy were annealed in the temperature range of 490 to 610℃ for 1 h and milled by using a planetary ball mill into the powders with the size of 250~850 sm. Then the powder cores were produced through the blending of the magnetic powders with the 5 wt% of ceramic insulator and cold compaction. Further the annealing responses of magnetic, electrical properties and microstructure were investigated. At the annealing temperature of 550℃, the microstructure was transformed from amorphous to crystalline a-Fe phase with the grain size of 10.7 nm, and the electrical resistivity of 117 μΩ-㎝ was obtained. At the same time, the effective permeability and quality factor reached 120 and 50, respectively, and the permeability persisted up to about 500 kHz. Moreover the core loss at the frequency of 50 kHz and the magnetic induction of 0.1 T was about 300 mW/cm³. These magnetic properties were comparable to the conventional powder core materials such as MPP(molybdenum permalloy powder), Sendust etc. However the dc bias characteristics represented by the permeability stability upon dc magnetic field superposition were found to be unsatisfactory. (Received February 16, 2004)
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노태환,이영아,이지은,이심성,정옥상,Jung Woon Lee 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.3
Reaction of AgNO₃with triethanolaminetriisonicotinate (L) produces 1 D coordination polymer of [Ag₃(L)₂](NO₃)₃and the same treatment of Cu(NO₃)₂with L gives 1D coordination polymer of [Cu(L)₂](NO₃)₂. The nonrigid triethanolaminetriisonicotinate acts as a m 3-bridged tridentate for [Ag₃(L)₂](NO₃)₃and a μ₂-bridged bidentate for [Cu(L)₂](NO₃)₂ to produce unusual motifs. The NO₃- anions can be smoothly exchanged by PF6- anions in an aqueous suspension without destruction of the skeletal structure.
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제일원리계산방법에 의한 결정 구조에 따른 덩치 망간의 전자 구조와 자성 변화 연구 : 면심입방과체심입방 구조의 망간 fcc and bcc Mn
노태환,홍순철 울산대학교 2002 자연과학논문집 Vol.11 No.2
덩치 망간의 평형상태에서의 결정구조와 자성 구조는 아주 복잡한 것으로 알려져 있다. 본 연구에서는 자성 연구에서 가장 적합한 방법으로 알려져 있는 Full-potential Linearized Augmented Plane Wave(FLAPW) 방법을 사용하여 격자상수의 함수로 면심입방 Mn과 체심입방 Mn의 계산 가능한 자성 상태(상자성, 강자성, 반강자성 상태)의 총에너지를 계산하여 결정구조에 따른 Mn의 자성 변화를 연구하였다. 계산 결과, 면심입방 Mn은 반강자성 상태가 안정하고 체심입방 Mn은 강자성상태가 안정한 것으로 밝혀졌다. 면심입방 Mn과 체심입방 Mn의 평형상태의 격자상수는 각각 6.750, 5.314 a.u. 이었고 자기모멘트는 1.15 μ_B과 0.85 μ_B인 것으로 계산되었다. 면심입방의 경우는 강자성 상태가, 체심입방의 경우는 반강자성 상태가 전혀 안정되지 못하는 것으로 나타났다. Manganese is known to have a very complicated crystal structure due to its complex magnetism. In this study we investigated the magnetism of fee and bcc Mn as functions of lattice constants, using Full-potential Linearized Augmented Plane Wave(FLAPW) method and assuming para-, ferro-, and antifcrro-magnetic states. The anti ferromagnetic and ferromagnetic states were calculated to be energetically stable for fee Mn and bcc Mn, respectively. The lattice constants of fee and bcc Mn at equilibrium are 6.750 and 5.314 a.u. and the magnetic moments are 1.15 and 0.85 μ_B, respectively. The ferro- and antiferro-magnetic states are so unstable (not even metastable) that the states were converged to the other magnetic states in self-consistent calculations.
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노태환,한재도,진승우,백세일 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
항공기의 구조해석을 위한 외부하중은 일반적으로 해당 항공기의 공력 및 중량 데이터베이스를 바탕으로 기동 시뮬레이션 등을 통해 계산된다. 본 연구에서는 이러한 외부하중의 재생성 절차 없이 기존의 하중 생성 결과 혹은 비행시험 결과로 얻어진 항공기 각 단면의 하중 정보들을 활용하여 전기체 유한요소모델에 해당 하중을 재분배하는 방안을 수립하였다. 전기체 유한요소 해석을 통해, 기존의 하중 분포에 의한 항공기 각 부재의 내부하중 분포와 하중 재분배 후의 내부하중 분포를 비교하였으며, 이를 통해 본 하중 재분배 방법의 타당성을 확인하였다. Aircraft external loads for structural analysis are usually developed from maneuver simulations based on the aerodynamic and mass database of the aircraft. In this research, external load redistribution method for full-scale aircraft finite element model is investigated using the aircraft section loads from previous load analysis or flight test results. Using the full-scale FE model, internal load distribution of the aircraft structures, as a result of the external load redistribution, were compared with the previous one from the original external loads. The comparison result shows good match and the redistribution method is to be valid for actual application.
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