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장방형내 함수 다공성 물질의 동결거동에 관한 실험적 연구
김병철,김종일,김진흥,Kim, B.C.,Kim, J.I.,Kim, J.H. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.5
Freezing of saturated porous media contained in a rectangular cavity has been studied experimentally. Water and different diameter glass beads consitituted the liquid and porous media. Solidification front shape, the effects of bead diameter and initial liquid temperature was investigated. When the hot wall temperature was below $4^{\circ}C$, the freezing rate was higher at the top than at the bottom due to the density inversion, but with increasing the hot wall temperature the freezing rate at the top was effected by the liquid temperature and was lower than at the bottom. With increasing the bead diameter, the difference of freezing rate between top and bottom was increased and depends on thermal conductivity. When the liquid temperature was low in the beginning, the freezing rate was high, but with increasing the time almost the same with those of high temperature liquid.
이민석(M . S . Rhee),이유인(Y . I . Lee),이석(S . Lee),김성훈(S . H . Kim),정영철(Y . C . Jung),고경철(K . C . Koh),홍기창(K . C . Hong),김병철(B . C . Kim) 한국축산학회 1996 한국축산학회지 Vol.38 No.5
A total of 115 pork carcasses (L = Landrace; Y = Large Yorkshire; D = Duroc; F₁ = Landrxe × Large Yorkshire; F₂ = Duroc × Landrace × Large Yorkshire) in Korea was tested to compare their carcass values and meat quality for the development of high pork quality. Carcass values that were measured included dressing percentage (DP), backfat thickness (BF), loin eye area (LEA) and meat percentage (MP). The following measurements of meat quality were carried out : pH-value at 1hr and 24hrs postmortem, subjective scoring test ; color, firmness, marbling degree, meat color ; L^* , a^* , b^* , chroma and Co¨fo-value, water holding capacity (WHC); filterpaper absorption method and bag drip method. In carcass values, D had lower MP and thicker BF compared to the others and they also had the smallest LEA(p$lt;.05). D and F₂ had significantly higher mailing scores than others but F₁ had the lowest(p$lt;.05). D and Y showed lower L^* and higher WHC. On the contrary, F₂ had lower WHC. In meat quality, D was superior to others in terms of moderate marbling, lower lightness and the lowest drip. In spite of the bad carcass values in D, it could be concluded that D must be utilized in a crossing system for the production of higher quality pork.
김병철(B. C. Kim),목형수(H. S. Mok),구현철(H. C. Ku),허정(J. Hur),이강윤(K. Y. Lee),유명종(M. J. You),최상문(S. M. Choe) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 Ansoft의 PExprt를 소개하고 PExprt를 사용하여 변압기 및 인덕터를 설계하는 방법을 다루었다. PEprt에서 지원하는 FEM 해석을 이용하여 설계된 변압기와 인덕터를 Simplorer용 모델로 변환하고 시뮬레이션에 사용함으로써 보다 정확한 시뮬레이션 결과를 얻을 수 있었다. 변압기와 인덕터의 실제 제작을 통하여 PExprt의 설계 결과를 확인하고 실험 결과를 통하여 FEM 해석을 통한 Simplorer 모델의 동작을 확인하였다.