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김기철(Kim, K.C.),전중환(Jun, J.H.),김승구(Kim, S.G.),국승택(Kuk, S.T.),임희천(Lim, H.C.),정병수(Jung, B.S.) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Quality evaluation of laser welded MCFC separator panels with large active area was performed. Lap joint was applied to produce stable air-tight seam weld by employing Nd:YAG laser. Results showed that surface contamination played a key role to form weld defects at the joint interface. However, there was no evidence that weld width at the lap joint changed after the stack operation time of 2,890h. Test results also revealed that the reinforcement values which were measured on the weld line after long time operation, were stable.
디지틀 컴퓨터에 의한 복합영농(複合營農) 시스템의 최적화(最適化) 연구(硏究) (I) -수학적(數學的) 모형(模型)
장동일,김기철,이상우,김만수,Chang, D.I.,Kim, K.C.,Lee, S.W.,Kim, M.S. 한국농업기계학회 1986 바이오시스템공학 Vol.11 No.1
The objective of this study was to develop a mathematical model for optimum design of diversified farming systems which have the regional characteristics. For this purpose, the farming surveys were conducted for mainly 1984 agriculture. They were carried out on January and July 1985 for three villages of central region of Korea. The surveyed data were analyzed by systems analysis and the diversified farming systems were modeled. They consist of four and six croping patterns for paddy and upland, two and three kinds of fruit crop and livestock, and seven kinds of farm machinery for each work system. Then a mathematical model was developed by the multiple objective decision making (MODM) method in order to design optimum systems of diversified farming. It consists of 23 decision variables, two objective functions and nine constraint functions. The goals of objective function are maximization of agricultural incomes and power inputs of farm machinery, and the modeled factors for constraint function are arable land, available capital, labor, and land utilization.
디지틀 컴퓨터에 의한 복합영농(複合營農) 시스템의 최적화(最適化) 연구(硏究)(II) -최적설계(最適設計)
장동일,김기철,이상우,김만수,Chang, D.I.,Kim, K.C.,Lee, S.W.,Kim, M.S. 한국농업기계학회 1986 바이오시스템공학 Vol.11 No.2
This study was carried out to design the optimal systems of diversified farming by the mathematical model developed. In order to achieve this goal, a computer program named DFSDINGP was developed by the nonlinear goal programming(NGP), and for testing its effectiveness, the optimal systems of diversified farming were designed for three regions surveyed and compared them with those of the conventional. DFSDINGP was programmed with FORTRAN 77 and it could handle the NGP problem having 25 independent variables and 75 constraint functions. The study results showed that the developed models and DFSDINGP could design the optimal systems of diversified farming satisfying two goals which are maximum agricultural income and maximum power inputs of agricultural machinery. The agricultural incomes and power inputs of farm machinery of the optimal systems were more than those of the conventional as much as 29-62% and 9-134%, respectively.
여준기,양일석,김기철,노태문,김종대,Lyuh, C.G.,Yang, Y.S.,Kim, K.C.,Roh, T.M.,Kim, J.D. 한국전자통신연구원 2007 전자통신동향분석 Vol.22 No.5
유비쿼터스 사회에서는 언제, 어디서나 네트워크에 연결하여 다양한 형태의 실감 정보를 제공 받아 더욱더 풍요로운 삶을 누릴 수 있을 것이다. 이것은 음성인식 및 영상합성 생성기술, 입체 영상/음향 입?출력기술, IT-NT-BT 기술융합의 가속화로 지능형 실감형 정보처리는 물론 휴먼정보 등의 다양한 정보처리가 가능한 유비쿼터스 휴대 단말기에 의해서 실현될 것이다. 휴대 단말기에서 반도체는 약 $40{\sim}50%$의 비중을 차지하는 가장 중요한 부품이며, 다양한 지능형 실감형 정보를 처리하기 위하여 막대한 양의 데이터를 처리할 수 있는 저전력 고성능 반도체 SoC 개발이 필수적이다. 본고에서는 휴대 단말기에 사용되는 SoC 기술 및 재구성형 프로세서 기술 동향을 파악함으로써, 유비쿼터스 단말기에서 필수적으로 사용될 반도체 SoC 기술의 발전 방향에 대해서 전망해 보았다.
돈분사일리지의 발효성장에 미치는 수분함량 및 당밀대체수준의 영향
정태영(T . Y . Chung),김기철(K . C . Kim),이상락(S . R . Lee),김종민(C . M . Kim),최일(I . Choi),장문백(M . B . Chang),맹원재(W . J . Maeng) 한국축산학회 1993 한국축산학회지 Vol.35 No.5
In view of the effective recycling of animal waste, the fermentation characteristics of swine manure ensiled under various conditions were investigated as the first step to search how to reuse animal waste as feed for animals. The moisture content of swine manure was adjusted to 30, 50 and 70%, respectively and molasses was substituted at the levels of 0, 15 and 30% in each treatment. Small vinyl bags were used as silos for ensiling, and changes of the contents of various organic compounds were measured during the ensiling period of 0, 3, 10 and 30 days, respectively. The temperature for ensiling was constant to be 22℃ for all treatments. The silage pH which is generally used as a criterion to evaluate the fermentation quality of silage was significantly (p$lt;0.001) decreased as levels of moisture and molasses content were increased. In contrast, the content of water soluble carbohydrate was significantly(p$lt;0.01) decreased with higher contents of moisture and molasses. This results may indicate molasses were used as an effective source of energy for the fermentation of swine manure. However, because the values of pH in this study were higher in all treatments than that of the general forage silage, it was presumed that the supply of available energy for microbial growth was a~ot enough in all treatments of this experiment. Furthermore, this inference was supported by the fact that lactic acid was not detected in all treatments so that the fermentation was not progressed up to that of lactic acid formation. More detailed research regarding the sources and levels of available energy for microbial growth may be needed in the future particularly when ensiling swine manure.