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Transient Stability Analysis using Large-Scale Real Time Digital Simulator
Yoon, Yong-Beum,Kim, Tae-Kyun,Won, Jong-Ryul,Shin, Jeong-Hoon,Kim, Yong-Hak,Cha, Seung-Tae,Choo, Jin-Boo The Korean Institute of Electrical Engineers 2001 KIEE International Transactions on Power Engineeri Vol.a11 No.4
The KEPS(KEPCO's Enhanced Power system Simulator) Real Time Digital Simulator(RTDS) is the largest real time power system simulator ever built. A power system which includes 320 (3-phase) buses and 90 generators has been modeled and run in real time. Since such large-scale systems were involved, it was not practical to validate them using non-real time electro-magnetic transient programs such as EMTDC™ or EMTP. Instead, the results of the real time electromagnetic transient simulation were validated by comparing to transient stability simulations run using PTI's PSS/E™ program. The comparison of results from the two programs is very good in almost all cases. However, as expected, some differences did exist and were investigated. The differences in the results were primarily traced to the fact that the electromagnetic transient solution algorithm provides more detail solutions and therefore greater accuracy than the transient stability algorithm. After finding very good comparison of results between RTDS Simulator and PSS/E, and after investigating the discrepancies found, KEPCO gained the necessary confidence to use the large-scale real time simulator to analyze and develop their power system.
근저항 트레이닝이 혈중 과산화지질 및 항산화효소 농도에 미치는 영향
주용식(Yong Sik Ju),이상우(Sang Woo Lee),서해근(Hae Guen Seo),김준모(Jun Mo Kim),정종윤(Jong Youn Chung),강신범(Shin Beum Kang) 한국사회체육학회 2004 한국사회체육학회지 Vol.0 No.22
The purpose of this study was to investigate the effect of exercise trainings, 12 weeks Muscle resistance training(MRT) based on the changes of MDA, SOD, CAT, and GPX concentrations which were known to be markers of antioxidant defense system. To accomplish this purpose, high school students was selected and chosen as the subjects and also were divided in muscle resistance training. Muscle resistance training group conducted their respective exercise trainings in 3 times a week for 3 months at 70~80% of respectively The results were as follows : 1. In MRT group, MDA concentration in all-out stage was found to have a significant increased. 2. In MRT group, SOD concentration was found to have a significant difference in resting and all-out respectively before and after training. 3. In MRT group, CAT concentration was found to have a significant difference in resting and all-out stages, respectively, before and after training. 4. In MET group, GPX concentration was found to have a significant difference in all-out stage As a result, it was found that Muscle resistance training increased not only MDA but antioxidant enzyme concentrations. In particular, Muscle resistance training was found to have more effective increase than Muscle resistance training in SOD, CAT and GPX concentrations.
대학교양 댄스스포츠 참가자의 여가태도와 재미요인이 심리적행복감과 삶의 질에 미치는 영향
강신범(Kang, Shin-Beum),장재용(Jang, Jae-Yong),김창숙(Kim, Chang-Suk),정상훈(Jeong, Sang-Hoon) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.1
The purpose of this study was to investigate the relationship between leisure attitude and fun factors on the psychological well-being and quality of life of college students in dance sports. The subject of this study is to find out the questionnaire by using the nominal sampling method for the students who took the liberal dance sports lessons to setting the university in B metropolitan city as the population in 2017. Data processing methods were frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis and multiple regression analysis. In this way the results are as follows. First, cognitive, positive, and behavioral attitudes of leisure attitude showed a static effect on feeling of flow, and cognitive and behavioral attitude had a positive effect on happiness. Second, the cognitive, positive and behavioral attitudes of leisure attitude showed a statistically significant effect on the psychological domain and the positive and behavioral attitudes on the living environment and self satisfaction. Third, all the sub factors of fun factor had a positive effect on the feeling of flow and happiness of psychological well-being. Fourth, all the sub factors of fun factors showed a statistically significant effect on the psychological domain, life environment and self satisfaction of the quality of life. In other words, leisure attitude and fun were predictive factors in improving psychological well-being and quality of life.
최대 전력점 추종의 속응성을 고려한 무인 태양광 자동차 시스템 설계
신예슬(Yesl Shin),이교범(Kyo-Beum Lee),전용호(Yong-Ho Jeon),송봉섭(Bong-Sob Song) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.4
This paper proposes an improved Maximum Power Point Tracking method and design methods of unmanned solar vehicle system by parts of hardware, unmanned driving control and power conversion. The hardware design is offered on the weight reduction and structural reliability by using structural analysis software. The technique of curve fitting is applied to unmanned control system due to minimizing the vehicle’s behavior. Furthermore, lateral controller applying actuator dynamics is robust enough to prevent performance degradation by measurement noise regarding position and heading angle. The power conversion system contains battery charger system and tapped-inductor boost converter. In the battery charger system, variable step-size MPPT is conducted for quick response of maximum power point tracking. The validity of the proposed algorithm are verified by simulations and experiments.
해양스포츠 참가자의 재미요인과 몰입이 여가만족에 미치는 영향
장재용(Jae-Yong Jang),권오륜(Oh-Ryun Kwon),강신범(Shin-Beum Kang) 한국항해항만학회 2013 한국항해항만학회지 Vol.37 No.1
The following study holds its purpose on verifying primary fun factors of participation and satisfaction on marine sports. The results are: 1) The efficiency, effectiveness of exercise, self-satisfaction, and family support turned out to be higher in the group with longer and higher period, time, and frequency of participation than those of the control group. 2) The period of participation, speculation on engagement according to the frequency, and behavioral factors were shown to be higher in the group with longer and higher period, time, and frequency of participation than those of the control group. 3) Satisfaction on leisure on social, physical, emotional, and educational means were higher in the group with longer and higher period, time, and frequency of participation than those of the control group. 4) The fun factors of marine sports- self-satisfaction, effectiveness of excercise, efficiency, and family support- had a positive effect on increasing satisfaction in leisure. 5) The fun factors of marine sports- effectiveness of excercise, self-satisfaction, and family support- had a positive effect on increasing satisfaction in leisure. 6) The speculation of engagement in sports and the reinforcement of engagement had a positive effect on increasing satisfaction of leisure. 본 연구는 해양스포츠 참가자의 재미요인과 몰입 그리고 여가만족도에 미치는 영향을 알아보기 위해 부산경남지역376명을 대상으로 신뢰도 분석, 요인분석, 일원분산분석, 회귀분석을 실시하였다. 연구결과는 1) 참가기간, 시간, 빈도에 따른 재미요인에서 효율성, 운동효과, 자기만족, 가족의 지원 요인에서 참가기간, 시간, 빈도가 높은 집단이 낮은 집단보다 높은 것으로 나타났다. 2) 참가기간, 빈도에 따른 몰입도의 인지, 행위 요인에서 참가기간, 빈도, 시간이 높은 집단이 낮은 집단보다 높은 것으로 나타났다. 3) 참가기간, 빈도, 시간 따른 여가만족도의 사회적, 신체적, 정서적, 교육적 만족 요인에서 참가기간, 빈도, 시간이 높은 집단이 낮은 집단보다 높은 것으로 나타났다. 4) 해양스포츠 참가자의 재미요인의 자기만족, 운동효과, 효율성, 가족의 지원 요인은 여가만족도에 긍정적인 영향을 미친 것으로 나타났다. 5) 해양스포츠 참가자의 재미요인의 운동효과, 자기만족, 가족의 지원 요인은 여가만족도에 긍정적인 영향을 미친 것으로 나타났다. 6) 해양스포츠 참가자의 몰입도의 인지ㆍ몰입 요인은 여가만족도에 긍정적인 영향을 미친 것으로 나타났다.