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- 저자 : 유재현(J.H. Yoo) (검색결과 11 건)
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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/>
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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 2011 운동과학 Vol.20 No.1
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.
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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.
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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/>
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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."
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