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윤연주(Younju Yoon),문진우(Jin Woo Moon),김수영(Sooyoung Kim) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.1
This study proposes a simulation method for effective prediction of photosensor illuminance under various daylight conditions. Computational theory for simulation was developed and prediction results by the simulations were validated against field measurement results. Results indicate that difference range between simulation and measurement was wide when direct component of daylight was strong. The absolute difference range under overcast sky was narrow compared with that under clear and partly cloudy sky. Correlation between simulated and measured illuminance was strong. Linear relationship between them was strongest under clear sky and weakest under overcast sky conditions.Regression models for the difference was acceptable under a low significance level.
윤연주(Younju Yoon),문진우(Jin Woo Moon),김수영(Sooyoung Kim) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.5
A theoretical method for the prediction of illuminance under diverse sky conditions was proposed in order to examine the variation of daylight illuminance at photosensors. The method was used to predict the illuminance of photosensor with a full-shielding condition. The prediction results were validated using the results of field measurement under various daylight conditions. Results imply that the predicted values were lower than those of measurement under clear and partly-cloudy sky, but the predicted values were greater under overcast sky. Percent differences between predicted and measured values decreased as the distant between window and photosensor positions increased. The coefficient of determination between predicted and measured global illuminance was greater than 0.9912 under all sky conditions. The correlation between predicted and measured photosensor illuminance was also strong under clear and partly-cloudy sky, but the correlation was weak under overcast sky. Statistical test results showed that the linear regression models between predicted and measured values were acceptable with a significance level of 0.01.
소규모 사무실에 적용된 조광제어 시스템의 최적제어를 위한 주광변화 분석
윤연주(Younju Yoon),백용규(Yong-Kyu Baik),김수영(Sooyoung Kim) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.5
The influence of outdoor sky conditions on photosensor signals were examined to determine an appropriate index that is effectively used for optimum illuminance fluctuation when a daylight dimming system is used for a small office. Field measurements were conducted under various sky conditions. Results indicate that the outdoor global and vertical illuminance fluctuated within narrow ranges under clear and overcast sky conditions. The fluctuation of sky ratio under partly-cloudy sky caused wide ranges of illumnance fluctuation. A partially-shielded photosensor at backwall produced 56% of light output from fixtures controlled by a photosensor at ceiling. This implies that the photosensor at backwall does not always guarantee target illuminance due to the less output. The fluctuation of light output from fixtures were insignificant under clear and overcast sky. The fluctuation range of photosensor illuminance under partly-cloudy sky caused wide fluctuation ranges of light output. Regression result implies that the outdoor vertical illuminance was recommended for an effective index that is used for control of light output.
Android 기반 매립환경 모바일 영상 감시시스템 구축에 관한 연구
윤연주(Yeon-Joo Yoon),조성윤(Sung-Yun Cho) 한국컴퓨터정보학회 2013 한국컴퓨터정보학회 학술발표논문집 Vol.21 No.2
생활 폐기물매립지의 효율적인 관리를 위하여 매립장 내 매립작업 진척상황과 매립작업 관리를 24시간 관리 체계를 구축하고 이를 안드로이드 기반 영상감시 시스템과 연계함으로써 시설 관리자의 상시 감시 체계를 완성하였다. 이는 매립 진척 상황과 침출수 관리를 관리사무소의 관제시스템에서만 관찰하게 되어 있어 기상변화와 위급상황에 대처능력이 전무한 실정이다. 이번 연구를 통해서 매립시설 운영자가 외부에 있는 경우에도 매립지 전경 및 침출수 상황을 관찰을 할 수 있도록 모바일 네트워크를 이용해 외부에서도 매립지 관찰을 할 수 있는 스마트폰 앱을 개발하여 24시간/365일 매립지 관찰을 할 수 있는 환경을 제공하고자 한다. 이러한 기본 개념들을 실제 안성시 생활 폐기물 매립장에 적용하기 위한 시스템 아키텍처 및 지능형 CCTV 컨트롤 시스템 스키마 등을 연구하였다.
윤연주(Younju Yoon),문진우(Jin Woo Moon),김수영(Sooyoung Kim) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.2
A computational simulation method was discussed in this study in order to predict photosensor signals under a variety of sky conditions. Theoretical approaches for a simulation method were proposed for prediction, and simulation results were compared with the results of field measurements. Results indicate that differences between prediction and measurement of outdoor global illuminance were higher under a clear sky condition compared to that under partly cloud and overcast sky condition. A photosensor positioned closer to window generated less difference between predicted and measured photosensor signals. Percent errors between predicted and measured photosensor signals under overcast sky conditions were higher than those under partly cloudy and clear sky conditions. Prediction models showed that strong correlations existed between predicted and measured photosensor signals.
사무실 공간에서 광선반 적용조건에 따른 조명제어 시스템의 효율 분석
윤연주(Younju Yoon),문진우(Jin Woo Moon),김수영(Sooyoung Kim) 한국생활환경학회 2016 한국생활환경학회지 Vol.23 No.2
This study examines the influence of lightshelf configurations on photosensor-based lighting control in a narrow-shaped office space. Computer simulations were conducted for three options for window configurations including lightshelf under a variety of daylight conditions. Results indicate that daylight factors under lightshelves conditions were lower than that of the conditions without lightshelf, since the lightshelf functions as an overhang that blocked incoming daylight to workplanes. The amount of dimmed light for the case with and without lightshelf was approximately equal. The photosensor positioned 2 m away from window provided excessive dimming under all sky conditions and failed to provide a target illuminance. The photosensors at 5 m and 8 m away from the window were effective under clear and partly cloudy sky conditions. The control system generated excessive dimming under overcast sky and undershot the target illuminance. When lightshelves were used, the correlation between workplane illuminance and photosensor illuminance by daylight was stronger compared to the case of no lightshelf. At least, 67.8% of lighting energy savings on average was achieved by the lighting control system.
윤연주(Younju Yoon),문진우(Jin Woo Moon),김수영(Sooyoung Kim) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.2
This study proposes simulation methods for effective prediction of annual illuminance due to sun and sky, separately. Computational theory for simulation was developed and prediction results by the simulations were validated against the prediction results by RADIANCE program. Among the proposed annual simulation methods for sun, the daylight coefficient method using 4 neighboring skies was most effective for prediction. Sun matching method caused errors in the estimation of direct sunlight due to the location difference between the actual sun and the matched sun. Among the developed annual simulation methods for sky, the daylight coefficient method based on 145 sky patches provides better accuracy in the calculation of illuminance compared to sky matching method. Correlation between illuminance computed using proposed annual daylight simulation methods and the illuminance computed using RADIANCE was strong. Regression models for the difference was acceptable under a significance level of 0.01.
단시간의 고강도 서킷 트레이닝이 비만 남자 직장인의 신체조성, 혈중지질 및 체력에 미치는 영향
윤연주(Yoon, Yeon-Joo),김아람(Kim, Ah-Ram),이호성(Lee, Ho-Seong) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.4
The purpose of this study was to investigate the effects of a short-term high-intensity circuit training on body composition, blood lipid profile and physical fitness in obese men office worker. Eighteen obese men office worker (BMI 〈25 kg/m²) were randomly assigned to high-intensity circuit training group (HICT, n=13) and control group (CON, n=5). High-intensity circuit training was consisting of 30-minute exercise session, 3-4 times a week, for 12 weeks. Body composition, blood lipids profile and physical fitness were measured before and after high intensity circuit training. Body weight, BMI and body fat were significantly decreased in HICT after circuit training than at before circuit training (p〈.01). TG was significantly decreased in HICT after circuit training than at before circuit training (p〈.05), and TC tended to be reduced than at before circuit training (p=.053). Squat (p〈.05), sit-up (p〈.01) and push-up (p〈.01) were significantly increased in HICT after circuit training than at before circuit training. However, all parameters in CON were not significantly different at between times. These results of this study may suggest that short-time high-intensity circuit training improves body composition and blood lipids, and increase physical fitness.