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김현진,유정목,박찬우,김아영,이준우,Kim, H.J.,Yoo, J.M.,Park, C.W.,Kim, A.Y.,Lee, J.W. 한국전자통신연구원 2014 전자통신동향분석 Vol.29 No.1
최근 모바일앱 시장이 급속하게 성장함에 따라, 모바일 사용자의 실제 사용 데이터를 수집해서 사용자의 행태를 분석하고 이를 앱 개발 및 마케팅 전략을 수립하는데 사용하는 모바일앱 분석기술에 대한 수요가 급증하고 있다. 본고에서는 모바일앱 분석기술을 이용해서 모바일앱 개발사나 운영자가 효율적으로 모바일 서비스를 운영할 수 있고 의사결정을 내릴 수 있는 데이터를 제공하는 도구 및 플랫폼에 대한 기술현황을 국내외로 나누어 소개한다.
김현진,이원학,Kim, H.J.,Lee, W.H. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.2
This study presents a way of improving the stability of fixed scroll in scroll compressors. For the scroll compressor whose fixed scroll is designed to move in the axial direction for the axial compliance, the fixed scroll is under the influence of the overturning moment produced by internal gas forces. Unless the overturning moment is properly compensated by the moments of reaction forces at the suspension of the fixed scroll to the compressor frame, the fixed scroll would exhibit wobbling motion, increasing gas leakage through the gap induced by the wobbling of the fixed scroll between the two scroll members. The conditions on which the wobbling motion can be suppressed have been found analytically; The axial position of the fixed scroll suspension should be made within a certain range. The upper limit of this range is the axial location for the o-rings which are inserted between the fixed scroll and the back pressure chamber to promote sealing for the gas in the back pressure chamber. And the lower limit is mainly determined by the magnitude of the axial sealing force. As long as the axial sealing force is not negative over all crank angles, the lower limit is not above the mid-height of the scroll wrap. Larger axial sealing force lower the lower limit.
김현진(H. J. Kim),이진갑(J. K. Lee) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
For a reciprocating compressor of household refrigerators, a direct analogy between the pipe flow network and the electric circuit network has been utilized to set up a mathematical model for oil supply system. Individual lubrication elements of the oil supply system, such as propeller- installed oil cap, oil galleries, radial oil feeding holes, spiral oil grooves, and various sliding surfaces have been analogized by equivalent electric elements, and these have been combined together to form an electric circuit corresponding to the whole oil supply system. By solving the closed network equations of the model, oil flow rates at various lubrication elements could be obtained. Total amount of the oil flow rate drawn into the shaft has been measured and compared reasonably well with the prediction of the numerical simulation.