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퍼지 PI scaling factor의 분석적인 유도방법에 관한 연구
조정민(Jeong-Min Jho),전기영(Kee-Young Jun),이승환(Seung-Hwan Lee),오봉환(Bong-Hwan Oh),이훈구(Hoon-Goo Lee),한경희(Kyung-Hee Han) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Fuzzy logic control(FLC) has been studied extensively and has been applied in various applications. The most popular control strategy takes the Fuzzy Proportional-Integral(FPI) form. While systematic methods have been developed to derive the fuzzy rules and membership functions, the choice of the scaling factors remains an open problem. In this paper, an analytical FPI scaling factor determining method is derived, based on the functional equivalence of the PI and FPI controllers. Simulations have been carried out with a brushiess DC motor drive system as test-bed, the obtained results have verified that the derived method is applicable to both the initial choice and further tuning of the FPI scaling factors.
대학 유도선수들의 지도자신뢰와 스포츠자신감 및 경기력 간의 관계
이혜선(Lee, HyeSun),전기영(Jun, KeeYoung),정성숙(Jung, SungSook),홍승분(Hong, SeungBun) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.17
이 연구는 대학 유도선수들을 대상으로 지도자신뢰가 경기력에 미치는 영향을 살펴보고, 지도자신뢰와 경기력 간의 관계에서 스포츠자신감이 어떠한 매개효과를 보이는지 검증하는데 그 목적이 있다. 이를 규명하기 위해 2016년 대한유도회에 등록된 대학선수 330명의 대상에게 설문조사를 실시하였다. 최종적으로 유효한 설문지 300부를 분석한 결과, 다음과 같은 결과를 도출하였다. 첫째, 대학 유도선수들이 지각하는 지도자신뢰 중 감성적 신뢰와 행동적 신뢰는 스포츠자신감에 정(+)의 영향을 미치는 것으로 나타났으며, 인지적 신뢰는 스포츠자신감에 부(-)의 영향을 미치는 것으로 나타났다. 둘째, 지도자신뢰 중 행동적 신뢰는 경기력에 정(+)의 영향을 미치는 것으로 나타났으며, 감성적 신뢰는 경기력에 부(-)의 영향을 미치는 것으로 나타났다. 셋째, 스포츠자신감에서는 사회적지지 요인에서만 경기력에 정(+)의 영향을 미치는 것으로 나타났다. 마지막으로, 지도자신뢰와 경기력의 관계에서 스포츠자신감은 부분매개효과가 있는 것으로 나타났다. The purpose of this study was to investigate the effects of university judo players ’ trust in their coach and sports self-confidence in performance and to examine the mediating effects of sports self-confidence in the relationship between trust in coach and performance. For data collection, the questionnaire was administered to 330 university players who were enrolled in the Korea Judo Association in 2016. The results of analyzing the total of received 300 responses are as follows. First, as the results of analysis on the effects of university judo players ’ trust in their coach on sports self-confidence, among trust in coach the emotional trust and behavior trust had a positive effect on sports self-confidence, and the cognitive trust had a negative effect on sports self-confidence. Second, as the results of analysis on the effects of trust in coach on performance, the behavior trust had a positive effect on performance, and the emotional trust had a negative effect on performance. Third, as the results of analysis on the effects of sports self-confidence on the performance, that had a positive effect on only social support factor. Lastly, in the relationship between trust in coach and performance, sports self-confidence had a mediator effect.
인버터 구동 시스템에서의 EMI 저감을 위한 새로운 PWM 구현
함년근(Hahm Nyon Kun),김이훈(Kim Lee-Hun),전기영(Jun Ki-Young),천광수(Chun Kwang-Su),원충연(Won Chung-Yuen),한경희(Han Kyung-Hee) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
High frequency common mode voltage produced by power inverters are a major cause of conducted EMI, creating motor ground currents, bearing currents and other harmful by products. This paper focuses on a new SVPWM method with random PWM injection to reduce conducted EMI noise. A New PWM technique associated with the common mode voltage can be significantly reducing and contributes to mitigate. The common mode voltage to 50% in comparison with that for conventional SVPWM technique. Validation of the theory and reduction methods are then performed experiment ally based on an induction motor drive.