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윤신천 안동대학교 가정학회 1984 家庭學硏究 Vol.1 No.1
지역사회의 빠른 속도의 변화는 가정의 교육기능이 가정을 벗어나 사회 전문기관에로의 전이를 불러왔다. 특히 우리나라 유아교육은 1980년에 들어 오면서 새삼 크게 거론되어 관심을 불러 일으키고 있고 인간발달의 견지에서나 사회정의, 복지구현을 위해서나 기타 여러 측면에서 강조 되면서 획기적인 발전의 전기를 맞이하고 있다.
S. C. Yun(윤신천),K. J. Euh(어광준),H. W. Kim(김형욱),K. A. Lee(이기안) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
This study attempted to produce a clad sheet with strip casted AA3527 alloy and AA4343 alloy, and attempted to investigate the effect of intermediate heat treatment and brazing treatment on the mechanical properties (hardness, tensile properties) of 3527/4343 aluminum clad sheet. The core sheet (manufactured by strip casting), AA3527 alloy (composition: Al-0.54Si-0.55Fe-0.76Cu-1.18Mn-0.03Mg-0.32Cr-0.08Ti), and surface thin sheet for brazing, AA4343 alloy (composition: Al-7.38Si-0.138Fe-0.01Ti) underwent hot rolling and cold rolling, and then a roll bonding for finishing. The overall thickness of the clad sheet was measured at approximately 0.22mm (AA3527: 0.20mm, AA4343: 0.02mm). The intermediate heat treatments were conducted on the conditions of 360℃-400℃/14 hours. Then, the samples underwent 100 minutes of brazing treatment at temperatures of 610℃. In the 3527 alloy region, Al, Al6Mn and AlFeMnSi phases were observed. In the case of 4343 region, Al, eutectic Si, AlFeSi phases were identified. The microstructure observation results represented partial recovery and recrystalization at temperatures of 360℃ and 380℃ heat treatment conditions, and complete recrystalization was observed at 400℃ condition. Tensile and yield strengths decreased (249.8MPa->203MPa, 203.8MPa->88MPa) and elongation increased (7.6%->10.4%) as heat treatment temperature increased. After brazing treatment, recrystalization and grain growth appears regardless of intermediate heat treatment temperature. Erosion in directed from partial 4343 alloy region to 3527 alloy region was occasionally found. Tensile properties after brazing are identified to be similar regardless of intermediate heat treatment conditions
험지에서의 가변 휠형 무인 자율차량의 자세 제어를 위한 가변 휠의 형상 계획
임경빈(Kyeong Bin Lim),박석훈(Sukhoon Park),윤용산(Yong San Yoon),이상훈(Sang Hoon Lee),강신천(Shincheon Kang) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
Hybrid locomotive UGV with actively articulated legs along with wheeled ends has high traversability to travel over rough terrain. The behavior control method was usually adapted for the controlling of the suspension configuration which determines the traversability of the UGV. In this study, we are proposing a method of configuration planning of the legs without any detail geometric data about the terrain. The terrain was estimated by the traces of each wheel and the leg configurations for the desired posture of the vehicle were set up against the constraints of the terrain. Also, an optimal leg configuration was calculated based on the quasi-static stability and power consumption, and plans for the leg behavior were made. Validity of the proposed method was checked by simulations using some off-the-shelf programs, and showed that the orientation control without geometric features of terrains and simplification of the behavior planning for obstacle negotiation were possible.