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이혜연(H.Y. Lee),이욱화(U.H. Lee),정용호(Y.H. Chung),문형배(H.B. Moon),서우석(W.S. Seo),성판영(P.Y. Sung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문에서는 제주 한림 풍력발전소와 한림 변전소간에 구축할 예정인 80㎸ 60㎿ HVDC 시스템의 계통해석을 위해 PSS/E를 이용하여 HVDC 시스템을 구성하고 그 동작특성을 분석하였다. 개발된 PSS/E HVDC 모델을 이용하여 2012년 제주 Peak 케이스와 Off-Peak 케이스에 대하여 정상상태 계통특성을 검토하였고, 계통 상정 사고를 모의하여 과도상태 계통상황을 검토하고 그 특성을 분석하였다. 또한 그 결과를 바탕으로 국내 기술을 이용하여 개발될 예정인 80㎸ 60㎿ HVDC 시스템의 정격 및 운영전략을 수립하였다.
고집적 스위칭 전원을 위한 LLCT 설계 및 Half-Bridge 직렬공진 컨버터
박진영(J.Y. Park),공영수(Y.S. Kong),김은수(E.S. Kim),이혜연(H.Y Lee) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
High density power supply technology has been researched over the last few years. In this paper, integrated LLCT(Inductor-Inductor-Capacitor-Transformer) structure is described for use in the half-bridge series resonant converter. The structure is analysed by means of FEMM(Finite Element Method Magnetics) and the experimental results of an LLCT structure for a 300W converter are presented.
곽지연,김서연,김자영,이혜연,정문정,진수현,천선우,하소현,한희진,양숙자,김지연 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50
Purpose: The purpose of this study was to identify college student's perception and practice of 'National Cancer Prevention Actions' and the factors that influence the perception and practice. Method: The participants were 310 undergraduates selected by convenience sampling at colleges in Seoul. Instrument was 2014 Survey of Perception and Practice of National Cancer Prevention Actions by National Cancer Center(2014), and has been modified for the purpose of the study. The data were analyzed by t-test, ANOVA and Scheffe test with SPSS 23.0 Windows software. Results: The most recognized action for cancer prevention in college students was "Do not smoke, also avoid smoking smoke"(96.8%) while the most unrecognized was "Get a type B hepatitis vaccination"(58.7%). The most practiced action for cancer prevention in college students was "Sexually as to safe sex"(94.8%) while the most unpracticed was "Exercise five times a week or more, for at least 30 minutes a day"(33.9%). Among general characteristics, participants' age (t=-2.015, p<.05), major (F=3.109, p<.001), and residential type (F=4.959, p<.01) were statistically significant in the recognition of Cancer Prevention Actions and major(F=3.341 p<.05) and residential type(F=3.827, p<.05) were also significant in the practice of Cancer Prevention Actions. Among health characteristics, health concern(F=3.154, p<.05) and education in cancer(t=-3.112, p<.01) showed statistically significant differences in the recognition of Cancer Prevention Actions while health concern(F=7.896 p<.001) and subjective health status(F=9.913, p<.001) showed differences in the practice of Cancer Prevention Actions. Conclusion: These findings showed the gap between the perception and practice of cancer prevention actions. Considering the importance of individual characteristics, it is essential to develop a differentiated cancer prevention education program for college students. Also, nursing intervention program should be developed to raise the alertness of cancer in order to enhance cancer preventive practice.