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유도전동기 벡터제어 시스템의 EMI저감을 위한 새로운 PWM기법
배우리(W.R Bae),이원철(W.C Lee),유재성(J.S Yu),김이훈(L.H Kim),함년근(N.K Hahm),원충연(C.Y Won) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper describes the application of newly developed conducted EMI reduction technique of SVPWM in induction motor drive. The newly developed common mode voltage reduction SVPWM technique doesn't any zero-voltage vector states for inverter control. Hence it can restrict the common mode voltage better than conventional PWM technique. The proposed technique is verified through simulation and experimental results. And by applying vector-controled system, the proposed technique have superior ability of reducing EMI and equal control performance comparing conventional SVPWM technique
PWM 스위칭 기법에 의한 유도전동기 구동시스템의 전도노이즈 저감
김홍주(H.J. Kim),이원철(W.C. Lee),김이훈(L.H. Kim),원충연(C.Y. Won),최세완(S.Y. Choi),김규식(G.S. Kim),정동효(D.H. Jeong) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Conventional SVPWM method has null switching vectors. Null switching vectors cause high common-mode voltage in induction motor drive system. The newly developed common mode voltage reduction PWM technique don't use zero switching state for inverter control. It is realized by changing software without additional hardware. Simulation and experimental results show that proposed method are reduced common mode voltage more than conventional method.
지역사회 여성 주민의 건강보험제도를 활용한 건강검진 및 암검사 수검 특성
김영복,이원철,노운녕,조선진,백희정,손혜현,이순영,맹광호 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.1
This study, performed to analyze the factors associated with health and cancer screening using preventive programs from health insurance among the women of a community, through a survey of about 923 women in Euijungbu-city. The subjects of the study were selected by a proportional cluster sampling method. The self-reported questionnaire was intended to find factors associated with health screening and cancer screening. The results of this study were as follows: 1. In the case of health screening using health insurance, 14.1% of the subjects turned out to have been screened once or more in their respective life-time. Reasons given for non-participation in the screening were : 'lacking screening information', a belief that'it's not useful' and a belief that they' weren't sick'. 2. The factors associated with health screening behavior were age, educational level, number of doctor visits, BMI and health promotion behavior(p<01, p<05). Also, the factor associated with health screening behavior were cue to action and health status, and the predictors on health screening behavior were age and health promotion behavior(p<01, p<05). 3. In the case of cancer screening through the health insurance, 7.4% of the subjects turned out to have been screened once or more respectively in their life-times. Reasons given for non-participation in the screening were : 'lacking screening information',a belief they 'weren't sick' and that' it's not useful'. 4. The factors associated with cancer screening behavior were age, educational level, income, alcholol intake, excercise, number of doctor visits and BMI(p<01, p<05). Aditional factors associated with cancer screening behavior were cue to action, health belief score and health status. Predictors for cancer screening behavior were: age, health belief score, screening attitude and health status(p<01,p<05). As indicated by the above results, a lack of information was an important factor for a lack of participation in screening. Age and cue to action were also important factors in promoting the cancer screening rate. Therefore, a dissemination of information about cancer screening contributes to the promotion of a screening rate, and cooperation between health insurance and local health center facilitates to be public the community-based cancer screening program.