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이영환,Lee, Y.H. 한국전자통신연구원 2000 전자통신동향분석 Vol.15 No.1
구내통신선로설비는 초고속정보통신망을 건물 내의 이용자의 단말까지 연결해주는 설비로서 향후의 새로운 정보통신서비스를 위해서는 매우 중요하다. 기존의 국내의 구내통신선로설비는 음성급 전화 서비스 위주로 구성되어 있고 새로운 초고속정보통신망의 멀티미디어서비스를 수용하기 위한 구내통신선로설비를 구축하기 위해서는 관련 표준 및 기술기준의 개선이 매우 필요하다. 본 논문에서는 구내통신선로설비의 제외국의 표준화 및 기술기준 제정 현황을 살펴보고 국내의 현행 기술표준 및 기술기준과 비교.분석하였다. 이를 토대로 구내통신선로설비의 고도화를 위한 현행 기술기준과 관련 표준에 대한 문제점과 개선방안을 제안하였다.
이영환(Y. H. Lee),이연원(Y. W. Lee) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper focuses on the experiments to minimize freezing phenomena in the freezer of a household refrigerator. In the climate chamber, frosting characteristics and freezing phenomena in the freezer was investigated experimentally. Also, we performed the. experiments to find operation characteristics of refrigerator and measure freezing accumulation inside the freezer compartments with door opening and closing. The freezing accumulation measured much on grille fan, ceiling, shelf, left and right wall in order. At the same time, improvement plan and experiment based on these experiments were performed and examined successfully.
이영환(Y. H. Lee),이연원(Y. W. Lee) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper focuses on the simulation and characteristics of cold flow in the freezer of a household refrigerator. This flow field has been simulated with the standard κ-ε turbulence model by using 3-dimensional, steady and incompressible flow. It has been computed with door closing. And, we could find supercooled regions that vapor density rise. It is considered that deflections of temperature and velocity resulted from supercooled area in the freezer promote inflow moisture with door opening, as the results, heat and mass transfer in the freezer is fostered by the inflow moisture. At the same time, improvement plan and experiment based on these flow simulation were performed and examined successfully.
이영환(Y. H. Lee),이연원(Y. W. Lee),김남식(N. S. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper focus on the freezing mechanism in order to quantify the freezing amount in freezer of domestic refrigerator. It has been based on the foundation experiments and the results were applied to various improvement plans and experiments in order to minimize the freezing phenomena in freezer. First, freezing mechanism consists of inflow moisture with door opening and closing, evaporator freezing, defrosting vapor, wall freezing, drain water and remained vapor in freezer with door closing. Second, it was possible for us to quantify freezing amount and to design the improvement plans. Finally, we could minimize freezing phenomena in freezer through freezing mechanism and various improvement plans.
이영환(Y. H. Lee),이연원(Y. W. Lee),김남식(N. S. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper focus on the freezing experiments to minimize freezing phenomena in freezer of domestic refrigerator. In the wind tunnel, the frosting characteristic was investigated experimentally. Here, frosted weight increased with increasing air velocity and decreasing cooling plate temperature. In the climate chamber, freezing phenomena in freezer was investigated experimentally. Here, we performed foundation and improvement experiments in order to minimize the freezing phenomena in freezer, Also, we measured freezing amount in freezer insides and refrigerator weight. At the same time, various improvement plans and experiments based on these results were performed and examined successfully.