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태양전지의 전기적 출력 특성을 갖는 PWM컨버터 설계 및 제어
유재현(J.H Yoo),한정만(J.M Han),류태규(T.G Ryu),고재석(J.S Gho),목형수(H.S. Mok),최규하(G.H Choe) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
Solar energy has many advantage like as purity and infinity. Recently many researches about new energy source are processing in several places around the world in this paper, the virtual implement of solar cell was proposed to solve the problems as reappearance and repetition of some situation in experiment of photovoltaic. To realize the VISC, mathematical model of solar cell for driving converter was studied and the buck converter were compared in viewpoint of tracking error of characteristic curve of solar cell using computer simulation Also, Output characteristics of system analyzed through an experiment.<br/> <br/>
폐경 전,후 여성의 운동 및 음주습관에 따른 골밀도와 체력에 관한 연구
유재현 ( J. H. Yoo ),박은경 ( E. K. Park ),유광욱 ( K. W. Yoo ) 한국운동생리학회(구-한국운동과학회) 2011 운동과학 Vol.20 No.1
본 연구는 폐경 전·후 여성을 대상으로 운동습관과 음주습관에 따라 골밀도와 체력에 미치는 영향을 분석하여 운동프로그램에 관련된 유용한 정보를 제공하는데 목적이 있다. 연구를 수행하기 위하여 강원도 C보건소를 내원한 여성 508명(폐경 전 215명, 폐경 후 293명)을 대상으로 하였다. 피험자들은 운동습관에 따라 비운동군, 저운동군(주당 2회 이하 운동), 중정도 운동군(주당 3회 이상)으로, 음주습관에 따라서는 비음주군과 음주군(주당 2회 이하 음주)으로 각각 분류하였다. 측정변인은 골밀도와 최대산소섭취량, 체지방률, 악력, 유연성, 민첩성, 평형성으로 하였으며, 집단 간 차이를 검증하기 위하여 운동습관에 따라서 one-way ANOVA, 음주습관에 따라서 Independent t-test를 각각 실시하였다. 폐경 전의 경우, 운동습관에 따라 유연성에서만 유의한 차이를 보였으며, 골밀도 및 기타 체력요인에서는 유의한 차이를 나타내지 않았다. 폐경 후의 경우, 골밀도와 체지방율에서 통계적으로 유의한 차이를 나타내었다. 음주습관에 따라서는 폐경 전 음주군이 비음주군에 비하여 골밀도가 낮았으나 통계적으로 유의하지는 않았다. 하지만 폐경 후의 경우, 음주군이 비음주군에 비하여 통계적으로 유의한 수준에서 높은 수준을 나타내었다. 결론적으로 규칙적인 운동은 골밀도와 체력유지에 도움을 주지만 본 연구에 비추어 볼 때, 성별, 연령별 특성을 고려한 운동목적의 설정과 교육 및 홍보가 필요하다고 사료되어진다. The purpose of the this study was to examine the comparison of bone mineral density and health related physical fitness induced exercise & drinking habits on pre and post-menopause of female. Using a cross-sectional approach, we studied 508 women(respectively, pre menopausal 215, post menopausal 293) who visited the C health center at Kangwon-Do. Subjects were divided into 3 groups depended on exercise habit(sedentary, exercise less than twice a week and more than three time a week) also, 2 groups depended on drinking habit(not drink and drink less than twice a week), respectively. We measured bone mineral density and health related physical fitness. One-way ANOVA were used to assess differences among 3 groups divided on exercise habits. Independent t-test were used to assess differences between drinkers and non-drinkers. Significance was accepted at p<.05. In pre-menopause, exclude sit & reach, physical fitness and BMD showed no significant difference among the exercise habits. Also, comparing with the non-drinkers, the drinkers had no significant differences in bone mineral density and physical fitness levels. In post-menopause, BMD and % of body fat showed significant differences among the exercise habits. Also, bone mineral density of drinkers showed a higher tendency than non-drinkers, but physical fitness had no significant differences between the groups. This study suggests that regular exercise can improve bone health by increasing bone mass or preventing age-related bone loss. Also, low intake of alcohol in pre-menopausal women may have decreased the bone mineral density, but in post-menopausal women may prevent decreasing of bone mineral density.
태양전지 가상 구현 모듈의 직ㆍ병렬 특성 해석 및 제어
한정만(J.M. Han),류태규(T.G. Ryu),유재현(J.H. Yoo),고재석(J.S. Gho),최규하(G.H. Choe) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
The solar energy is purity and infinity. Solar power converter were used to convert the electrical energy from the solar arrays to a stable and reliable power source. So much country research this solar energy system. The photovoltaic system is construct many solar cell array. In this paper, new implementation solar system was showed buck converter that V-I curve produced. This system can be used to study the short-term and long-term performances of solar cell and efficiency This system is a far more cost effective and reliable replacement for field and outdoor flight testing.<br/> Study of buck converter, analysis and control shun t ?series connection characteristics of solar cell array.<br/>
최해룡(H.R. Choi),이정민(J.M. Lee),고재석(J.S. Gho),유재현(J.H. Yoo),이승학(S.H. Lee),최규하(G.H. Choe) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper proposes the virtual implementation of solar cell(VISC) for photovoltaic system, It is required to make operation condition of solar cell arrays where is the limit of time and space<br/> The main advantage of the simulator is its ability to simulate different types and sizes of arrays considering V-I characteristics of data sheet. The VISC with buck-boost converter can be used to study the short-term and long-term performances of PV cells, The simulator is a far more cost effective and reliable replacement for field and ,flight testing.
MPEG-I Immersive Audio 표준화 및 기술 동향
장대영,강경옥,이용주,유재현,이태진,Jang, D.Y.,Kang, K.O.,Lee, Y.J.,Yoo, J.H.,Lee, T.J. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.3
Immersive media, also known as spatial media, has become essential with the decrease in face-to-face activities in the COVID-19 pandemic era. Teleconference, metaverse, and digital twin have been developed with high expectations as immersive media services, and the demand for hyper-realistic media is increasing. Under these circumstances, MPEG-I Immersive Media is being standardized as a technologies of navigable virtual reality, which is expected to be launched in the first half of 2024, and the Audio Group is working to standardize the immersive audio technology. Following this trend, this article introduces the trend in MPEG-I immersive audio standardization. Further, it describes the features of the immersive audio rendering technology, focusing on the structure and function of the RM0 base technology, which was chosen after evaluating all the technologies proposed in the January 2022 "MPEG Audio Meeting."
태양전지의 V-I특성 구현을 위한 PWM컨버터의 해석 및 제어
류태규(T.G Ryu),유재현(J.H Yoo),한정만(J.M Han),고재석(J.S Gho),최규하(G.H Choe) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, the virtual implement of solar cell was proposed to solve the problems as reappearance and repetition of some situation in experiment of photovoltaic. To realize the VISC, mathematical model of solar cell for driving converter was studied and the buck converter were compared in viewpoint of tracking error of characteristic curve of solar cell using computer simulation.