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박연민(Park, Yeon-Min),성태경(Sung, Tae-Kyung),김병철(Kim, Byung-Chul),김민석(Kim, Min-Seok),정채봉(Joung, Che-Bong) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.4
In this paper, we provided a light diffusion simulation of one-side patterned acrylic sheet for the daylighting system. First, the light diffusing performance comparison of the several commercial pattern sheets had been done. In case of the making a big-size daylight collector for the huge space, collecting sheets would be installed in multi-layered manner to improve the insulation performance of the whole system. We only focused on double layered cases to simplify the problem. Secondly, overall light diffusing simulation had been done for various two layered combinations, such as face to face, face to back. The results shows that the smaller curved pattern the better in light diffusion performance and that double face lower pattern combination is the best regardless of the gap between two sheets.
성태경(Sung Tae-Kyung),박연민(Park Yeon-Min),김종민(Kim Joung-Min),이충식(Lee Chung-Sik),이을영(Lee Euol-Young),정채봉(Joung Che-Bong),김병철(Kim Byung-Chul) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.5
Whereas recent domestic buildings and industrial facilities are being constructed as large as possible, the daylighting systems for the large space have rarely been developed. Domestic situation has been reported as only several small or medium sized daylighting systems have been developed, and the large scaled systems have entirely being imported from abroad. We have developed a large scaled daylighting system for the big space. The developed system have been evaluated in terms of the average system efficiency and daylighting factor. Each results are shown with tabulated experimental data.
이충식(Lee, Chung-Sik),박연민(Park, Yeon-Min),오동현(Oh, Dong-Hyun),이을영,성태경(Sung, Tae-Kyung),정채봉(Joung, Che-Bong),김병철(Kim, Byung-Chul) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
In this papers, we analyzed the performance evaluation for Multi face primatic Daylighting System. For this research, we conducted optical simulations using Lighting Tools Program for 12 models under various conditions. We selected 2 type models on the simulation results. And we compared model Ⅰ(azimuth tracking model)"s field test result with simulation result. Results show that system efficiency of the tracking system is higher 18.5% than the passive. This means that if the performance ratio of the passive model is assuming 100%, it is similar to simulation"s result 113%.
김경미(Kyungmi Kim),염유식(Yoosik Youm),박연민(Younmin Park) 한국콘텐츠학회 2013 한국콘텐츠학회논문지 Vol.13 No.9
본 연구는 학교폭력 경험이 한국 청소년의 심리적 안녕감에 미치는 영향을 다룬다. 학교폭력 경험을 피해형, 가해형, 피해-가해형, 무경험형으로 구분해, 주관적 행복감과 자살충동에 미치는 영향을 분석했다. 2013년 연세대 사회발전연구소의 조사 자료를 이용, 다중 회귀와 이항 로지스틱 분석을 실시했다. 분석결과, 학교폭력은 피해, 가해 등 경험 유형에 상관없이 학생들의 자살위험을 높였다. 특히, 학교폭력 피해와 가해를 중복적으로 경험한 양자형의 자살충동은 무경험형과 비교해 7.1배나 높았다. 한편, 학교폭력 경험이 주관적 행복감에 미치는 영향은 다소 제한적이었다. 즉, 피해 경험과 피해-가해 중복 경험만이 주관적 행복감에 영향을 미쳤으며, 가해경험은 유의한 영향을 미치지 않았다. 주관적 행복감 분석에서는 통제변인으로 사용된 스트레스 변인의 영향력이 부각됐다. 특히, 친구관계에서 비롯된 스트레스가 주관적 행복감에 압도적인 영향을 미쳤다. 본 연구는 학교폭력 경험의 영향을 부정적 안녕감(자살충동) 측면에서만 다루지 않고, 긍정적 안녕감(주관적 행복감)까지 동시에 분석한 최초의 시도로서, 학교폭력 경험이 미치는 영향에 대한 복합적인 이해를 가능케 할 것으로 보인다. This study examines the impact of school violence on South Korean students’ psychological well-being. The research is designed to analyze how different types of experiences of school violence ? victim, perpetrator, victim-perpetrator, and non-involvement ? influence students’ suicidal impulse and sense of happiness. Empirical data was gained from a national-scale survey conducted by Social Development Research Institute at Yonsei University in 2013, and was analyzed using binary logistic and multiple regression methods. Findings suggest that any types of experiences of school violence had significant effect on suicidal impulse. In particular, the likelihood of victim-perpetrator to experience suicidal impulse was 7.1 times stronger than non-involvement. However, the effect of experiences of school violence on students’ sense of happiness was insignificant. While the impact of school violence on sense of happiness among victims and victim-perpetrators was significant, its impact among perpetrators proved insignificant. Rather, stress factor - in particular, stress from peers ? had more significant impact on the level of students’ happiness. This study contributes to understanding the multiple effect of school violence by examining both negative and positive dimensions of psychological well-being.
다중 파라볼릭 반사경 방식을 이용한 추적식 집광시스템 개발
이충식(Lee, Chung-Sik),김종민(Kim, Jong-Min),박연민(Park, Yeon-Min),성태경(Sung, Tae-Kyung),정채봉(Joung, Che-Bong),강승훈(Kang, Seung-Hoon),김병철(Kim, Byung-Chul) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.2
Daylighting system is an alternative lighting system using daylight collecting device, light transformer and light diffuser. In this paper, we developed a daylighting system in which the collecting device composed by dual parabolic reflectors, the silica optical fiber adapted to the light transformer and light diffuser made of the polyglass squaresheet. We have estimated the system efficiency and general color rendering index(Ra)of the developed system. The system efficiency measured to 23.8% and Ra was revealed as 95. Ra number of the developed system is bigger than the number(65) of the previous fresnel lens based sunlight collector.