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자연채광을 이용한 인공조명의 제어방법에 관한 실험적 연구
차광석,김회서 한국조명전기설비학회 1994 조명.전기설비 Vol.8 No.1
기존 상업용빌딩은 실내 시환경 개선의 필요성이 중시됨에 따라서 자연채광과 인공조명을 겸용하는 천장형태에 따른 조명제어 방법으로 전기에너지도 절약하면서 실내의 작업면 조도는 적정조도를 이루게 하는 방안을 찾고자 한다. 이에 본 논문에서는 창 유리의 종류와 실내의 마감색채, 천장타입에 따른 인공조명의 제어방법을 가지고 실험을 하였으며, 실험한 데이터는 실내의 조명설계시 참고할 수 있는 기초적 자료로 제시하고자 했다. It is very important and necessary to predict luminous enviroment in an interior space. This paper has described about energy saving and evaluated interior visual environment in a office building having on/off turning control lighting system utilizing daylight. In order to predict the interior varior illumination distribution, the scale model was made and examined under various conditions, such ad difference of window glass, and color pattern of wall, floor, and also ceiling lighting system type. This paper suggests that basic fundamental data of lighting design performance in the concept and schematic stages of design.
고분자전해질 연료전지의 중저온 열원을 건물난방에 이용하기 위한 온도 제어장치 개발
차광석,김회서,Cha, Kwang-Seok,Kim, Hway-Suh 한국플랜트학회 2014 플랜트 저널 Vol.10 No.3
본 연구에서는 기존 가정용연료전지에서 활용이 미약한 중저온의 배열을 건물난방부하에 적용할 수 있도록 온도 안정화 장치를 개발하였으며 이 장치가 기존 난방설비와 연계가 가능하도록 제어시스템을 구축하였다. 연료전지 시스템의 정상작동을 위해서는 연료전지로부터 배출되는 온수의 공급온도가 $60^{\circ}C$이어야 하고 다시 연료전지로 회수되는 작동 유체의 환수온도는 항상 $55^{\circ}C$로 유지하여야 한다. 본고에서는 먼저 스택배열 활용을 극대화하기 위해 CFD 분석을 통해 소형열교환기와 기존 난방설비배관과의 최적 연계장치시스템을 구성하였다. 또한 계절별 난방 수온의 불규칙한 온도변화에 대응하기 위해서 연료전지 스택의 열원과 아파트세대 난방용 환수관을 연결한 온도자동조절 밸브를 사용하여 온도안정화 장치를 개발하였다. 소형열교환기와 통합 활용할 수 있도록 설정된 온수의 온도가 편차 ${\pm}0.5^{\circ}C$ 이내에서 유지되도록 하였다. 이 연구결과를 통해 연료전지인 PEMFC의 배열을 건물난방부하에 활용이 추후 가능할 것으로 예상된다. This study performs several experiments on a newly developed temperature safety system that can be used for residential building heating systems, the heat source of which is derived from a conventional fuel cell. Prior to this, the hot water made from a fuel cell was not used in residential housing but just went to waste. The present safety system is installed in the current underfloor heating system. At first we used the CFD technique to develop a new heat exchanger. The fuel cell must satisfy the thermal conditions of the inlet temperature being $55^{\circ}C$ and the outlet temperature being $60^{\circ}C$. But variations in weather cause fluctuations in the heating water temperature. The experimental results show our new system capable of maintaining the temperature difference within a ${\pm}0.5^{\circ}C$ range. So we believe that our new PFMFC fuel cell stack array is a good candidate for being used in residential heating systems.
중년 남성의 유산소성 운동능력과 심혈관질환 인자와의 관계
김영길,차광석 서울産業大學校 1996 논문집 Vol.44 No.1
The purpose of this study was to identify the relation between the aerobic power and the risk for cardiovascular disease in middle-aged men. The subjects of this study were 30 males with age range 50-59. The % body fat was calculated from the skinfold thickness of the chest, abdomen, and thigh. The risk factors for cardiovascular disease were serum TC, TG, HDL-C, SBP, and DBP. Variables of cardiopulmonary function were VO₂max, VEmax, HRmax, and Exercise times. The results were summarized as follwos : 1. There was significant correlation between the systolic blood pressures and the skinfold thickness of the chest, abdomen(P<.05). Also, there was significant correlation between the diastolic blood pressures and the skinfold thickness of the abdomen(P<.05). But, there was not significant correlation between the blood pressure and the % body fat (P<.05). 2. There was significant correlation between the exercise times and the % body fat calculated from the skinfold thickness of the chest, abdomen, thigh (P<.05). But, there was not significant correlation between the other cardiopulmonary functions and the % body fat from the skinfold thickness of three sites (P<.05). 3. There was significant correlation between the exercise times and serum TG levels (P<.05). But, there was not significant correlation between the other cardiopulmonary functions and the concentrations of the other blood lipids components (P<.05). 4. The was not significant correlation between the aerobic power and the blood pressures (P<.05). Probably, the relation among the % body fat, the cardiopulmonary capacity, and cardiovascular risk factors may be different from the aged groups. Also, these relationships may be affected by the exercise habits.