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Younju Choi,Jiyung Kim,Haeng-Shin Lee,Cho-il Kim,In Kyeong Hwang,Hye Kyung Park,Tae-Hwa Kim,Chang-Hwan Oh 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.2
This study was conducted to provide a vitamin B<sub>12</sub> database for the representative Korean food items and to assess the dietary intake assessment of vitamin B<sub>12</sub> for Koreans. The vitamin B<sub>12</sub> content of 106 foods had been determined by high performance liquid chromatography (HPLC) using column switching method. Rich sources of vitamin B<sub>12</sub> were meats, milk, and egg (0.3-3.4 μg/100 g). Vegetables and fruits contained vitamin B<sub>12</sub> below limit of detection (LOD). The major food sources for vitamin B<sub>12</sub> intake were milk (72.0%), meats (22.3%), egg (3.6%), and fishes & shellfishes (2.1%). Mean vitamin B<sub>12</sub> intake of Koreans was 3.16 μg/person/day. The proportion of population with intake below estimate average requirement (EAR) and above recommended intake (RI) of vitamin B<sub>12</sub> was 60.7 and 36.5%, respectively. The vitamin B12 intake level of young children with 1-2 years which was 834.6% of RI while the intake level of the older adults 50 years and older was only 70.0% of RI. Also, there were regional differences between urban and rural area. The population with intake below RI was larger than that with intake above RI in Korea.
CFD를 이용한 Invisible Air vent의 공조성능 최적화
김연주(Younju Kim),최봉근(Bongkeun Choi),유영진(Youngjin Yoo),김무룡(Mooryong Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Air conditioning system in vehicle controls the temperature of cabin to provide driver a convenient and safe environment. Air vent, which is an important component of air conditioning system, controls air flow rate and flow direction. Manual control of air vent can cause unpleasant and dangerous situation while driving. To overcome these problems, invisible air vent was developed. Unlike conventional air vent, invisible air vent is composed of vent and cover. Besides its beautiful appearance, it is able to control the temperature of cabin more naturally than conventional system can do. However it was not easy to distribute flow to all direction. In this research, CFD analysis and optimization were performed to develop the performance of an invisible air vent system. Firstly, optimizing factors and those levels were selected using DOE and from this table CFD analyses were performed to find the optimized design. As a result, it was found that the inner angle of an air vent’s cover hole was the main factor of performance.
Ad - Hoc 네트워크를 위한 효율적 Routing 프로토콜
김민정(Minjeong Kim),김기천(Keecheon Kim),성연주(Younju Sung) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅲ
Ad-Hoc 네트워크에서는 노드의 위상 변화가 빈번히 발생하므로 경로 탐색 및 관리가 중요하다. 그러나 자원의 사용이 제한된 무선망에서 경로 탐색과 관리에 많은 자원을 소비하게 되면, 데이터 처리시의 자원사용에 영향을 미치게되므로 네트워크의 효율이 저하된다. 효율적인 Ad-Hoc 네트워크를 구성하기 위해서는 효율적인 라우팅 프로토콜의 설계가 매우 중요하다. 현재 표준으로 제정된 Ad-Hoc 라우팅 프로토콜들과 그 개선방안에 대해 살펴보고, 보안에 취약한 Ad-Hoc 네트워크에서 보안성을 제공하기 위해 제안된 프로토콜에 관해 살펴본다.
Younju Yoon,Jin Woo Moon,Sooyoug Kim 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.4
This study proposes computational algorithms for prediction of daylight illuminance under various daylight conditions. Five annual daylight simulation methods (ADSM) were developed for the sun and sky. Computer simulations using the ADSM were performed for a classroom with an exterior overhang. In order to validate the simulation results, the results from ADSM were compared with those by Radiance. Results indicate that the prediction by a sunmatching method and reflected daylight coefficient approach were similar to those by Radiance, when methods that consider the effect of sun were used. For the methods that consider the effect of sky, the daylight coefficient approach with four sky patches provided reliable results. The result implies that daylight coefficient approach is a useful method for the prediction of daylight illuminance under daylight conditions. Linear regression models between the results of ADSM and Radiance were acceptable with a significance level of 0.01. This implies that the ADSM can be effectively used for the prediction of indoor daylight illuminance.
Younju Yoon,Jin Woo Moon,Yong-Kyu Baik,Sooyoug Kim 한국생활환경학회 2016 한국생활환경학회지 Vol.23 No.4
This study examines the influence of system components of photoelectric dimming control systems on dimming control performance. Field measurements were performed and a series of computation were conducted. Continuous and integral reset control algorithms were used in connection with two photosensor shielding conditions. Results indicate that the change patterns of daylight illuminance of unshielded photosensor were similar to those of desktop illuminance. When continuous dimming control algorithm was used, unshielded photosensor conditions failed to meet a target illuminance. For the partially-shielded photosensor conditions, lighting fixtures overshot the desktop and less energy savings was achieved compared to the condition of unshielded photosensor. When the integral reset dimming control was used, the system failed to keep enough task illuminance. The desktop illuminance by electric light showed sudden peak values with no dimmed light for a particular time period. Partial shielding conditions were successful under overcast sky conditions, but no lighting energy savings was achieved. Desktop illuminance and light output correlated strongly. The ANOVA test results for the correlation were effective under a significance level of 0.01.
Yoon, Younju,Moon, Jin Woo,Alzoubi, Hussain H.,Kim, Sooyoung Elsevier 2017 Solar Energy Vol.153 No.-
<P><B>Abstract</B></P> <P>This study examines the accuracy of annual daylight simulation method (ADSM) in predicting illuminance for spaces with shading device conditions. ADSM algorithms were developed separately for the sun and sky to predict their effect on indoor daylight illuminance. Sun-matching and daylight coefficient methods were developed for the sun, while sky-matching and daylight coefficient methods with one and four sky patches were developed for the sky. The daylight illuminance computed from ADSM under various daylight conditions was compared with those calculated from Radiance and field measurements.</P> <P>Results imply strong linear correlations existed between the predicted daylight illuminance levels by the ADSM and Radiance under diverse sky conditions based on weather data. The predicted illuminance from ADSM was lower than field measurements for all sky conditions. ADSM computations mostly agree with field measurements. For clear and partly cloudy sky conditions, the daylight coefficient approach for sky of ADSM generated a stronger correlation to measured data, but the sky-matching algorithm showed a stronger correlation to field data. The daylight coefficient approach for sky, combined with ADSM computation algorithms for sun, effectively reduced the difference between the predicted and measured illuminance under clear or partly cloudy sky conditions. Under overcast conditions, there was no significant reduction in difference between simulated and measured illuminance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The accuracy of annual daylight simulation method (ADSM) in predicting illuminance for spaces with shading device conditions was examined. </LI> <LI> ADSM algorithms were developed separately for the sun and sky to predict their effect on indoor daylight illuminance. </LI> <LI> Sun-matching and daylight coefficient methods were developed for the sun, while sky-matching and daylight coefficient methods with one and four sky patches were developed for the sky. </LI> <LI> The daylight illuminance computed from ADSM under various daylight conditions was compared with those calculated from Radiance and field measurements. </LI> </UL> </P>
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.
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.