765 kV 2회선 송전선 활선 작업자 인체내부 유도전류 밀도 해석

송기현,민석원,Song, Ki-Hyun,Min, Suk-Won 대한전기학회 2006 전기학회논문지C Vol.55 No.5

This paper analysed the induced current density inside human body of hot-line worker for 765kV double circuit transmission line according to locations of human body. Human model was composed of several organs and other parts, whose shapes were expressed by spheroids or cylinders. Organs such as the brain, heart, lungs, liver and intestines were taken into account. Applying the 3 dimensional boundary element method, we calculated induced current density in case a worker was located inside and outside a lowest phase of 765 kV transmission line in which a 60% current of maximum load flowed. As results of study, we found a maximum induced current density in all organs was less than $10mA/m^2$ when a wonder was outside. As one in brain and heart was higher than $10mA/m^2$ when a worker was inside, we propose a method for lowering current density.

60Hz ELF 자계에 대한 고 도전율 및 고 투자율 재료의 차폐효과 분석

송기현,명성호,민석원,Song Ki-Hyun,Myung Sung-Ho,Min Suk-Won 대한전기학회 2005 전기학회논문지C Vol.54 No.4

Shielding methods on ELF(Extremely Low Frequency) magnetic fields may include the use of induced currents, modification of magnetic field flux patterns using high permeability and/or high conductivity materials, and others. The magnetic shielding properties of enclosures can be utilized to reduce the magnetic field of current carrying conductors. In this paper, to get a more practical understanding of shielding phenomena, we have investigated the magnetic field reduction by means of 3 dimensional numerical analysis and experiments. We found copper could reduce flux density more then permalloy in both cases of box shield and cylindrical shield. Iron under l0$\mu$T of 1 phase could reduce flux density about $20\%$ more than silicon steel, but both of them under 50$\mu$T has a similar reduction rate of $10\%$. The 3 phase horizontal model gave the highest reduction rate and the 1mm thickness iron under 10$\mu$T of 3 phase lines did lowest.

생활체육 참여자의 각성추구성향과 운동몰입 및 여가만족의 관계

송기현(Ki Hyun Song),허진영(Jin Young Huh) 한국여가레크리에이션학회 2010 한국여가레크리에이션학회지 Vol.34 No.1

The purpose of this study was to identify Relationship among arousal seeking, exercise commitment, and leisure satisfaction in the participant of sports for all. In order to obtain purpose of the study, member of sport for all clubs (N=275) who are currently registered in business sport center were recruited in Seoul and Gyeonggi-Do area by using the convenience sampling technique. The data were recorded and analyzed using SPSS ver. 14.0 to perform Frequency Analysis, Correlation Analysis and Multiple Regress Analysis. Results are as follows. First, arousal seeking have significantly influenced on exercise commitment. Thrill seeking has not influenced on both recognition and behavior flow. Novelty seeking has influenced on both recognition and behavior flow. Second, exercise flow of participant has influenced on leisure satisfaction. Recognition flow has influenced on all sub factors of leisure satisfaction, such as emotion, social, physical, environmental, and education satisfaction. Third, arousal seeking of participant has partially influenced on leisure satisfaction. Thrill seeking has influence on only environmental satisfaction. Novelty seeking has influenced on all sub factors of leisure satisfaction.

구조개선을 통한 전계완화용 폴리머컷아웃스위치의 개발

송기현(Ki-Hyun Song),민석원(Suk-Won Min),안소윤(So-Yoon An),김영희(Young-Hee Kim) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.7

체육수업에서 성취행동 예측을 위한 교사의 동기부여방식과 결과기대 및 과제관여의 관계모형 검증

송기현(Song, Ki-Hyun),임현묵(Lim, Hyuni-Muk),김승용(Kim, Seung-Yong) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2

The purpose of this study was to investigate structural relations among teachers` motivation styles perceived by outcome expectancy, task engagement and achievement behavior in physical education(PE) classes in middle school. The subjects include middle school students in the Seoul metropolitan region. Total 407 questionnaires were included as valid samples through convenience sampling. Data was treated with the SPSS 20.0 and AMOS 20.0 programs. The hypotheses were tested after checking the fitness of the overall model. The findings were as follows: First, autonomy support, one of subfactor of motivation styles, had significant effects on outcome expectancy, whereas controlling behavior had no significant effects on it. Second, autonomy support, one of subfactor of motivation styles, had significant effects on outcome expectancy, whereas controlling behavior had no significant effects on it. Third, students` outcome expectancy had significant impacts on their task engagement. Fourth, outcome expectancy had significant impacts on their achievement behavior. Fifth, task engagement had significant impacts on their achievement behavior. Lastly, outcome Expectancy, task Engagement had mediating effects on relations between teachers` motivation styles(autonomy support) and achievement behavior.

25.8kV Dry-air 가스절연 개폐장치에서의 상배열 방식에 따른 절연성능 고찰

송기현(Ki-hyun Song),이창환(Chang-hwan Lee),조유호(You-ho Cho),서왕벽(Wang-byuck Suh) 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.11

신체활동 참여 노인의 건강신념과 활력 및 성공적 노화의 구조적 관계

송기현(Song, Ki-Hyun) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.58

This study aimed at examining the relationship among the healt hbelief, vitality and successful aging of the elderly using the health belief model(HBM), which is helpfullyu sed in health promotion areas. To this end, a total of 302 male and female elderly people aged 65 or more hwo were participating in physical activities at public and private sports centers and elderly welfare factiliies in the metropolitan area were selected using convenience sampling, and the data collected from them were usde for final analysis. The data were analyzed using SPSS 18.0 and AMOS 18.0 program. After checking the vericifation of the goodness-of-fit of the entire model, the hypotheses were tested. The results are as follows. First, an examination of the relationship between the health bleief and vitality of the elderly participating in physical activities found that perceived benefit and perceived severity of health benefit had a positive effect on the vitality of elderly. Perceived susceptibility had a negatiev effect on vitality, and barriers to exercise turned out not to have a significant effect on vitality. Second, the vitality of the elderly participating in physical activities exerted a positive influence on their successful aging. Third, an examination into the relationship between the health belief and successful aging of the elderly participatin ginto physical activities found that perceived benefit of health benefit alone had a positive effect on the successful aging of the elderly. Finally, vitality turned out to serve as a medium between the health benefit (perceived benefit, severity and susceptibility) and successful aging of the elderly.

e스포츠 1인 미디어 속성과 지각된 유용성 및 재이용의 관계

송기현(Song, Ki-Hyun) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.6

This study aimed to analyze the attributes of one-person e-sports media and relations between perceived usefulness and reuse and further the mediating effects of perceived usefulness on relations between the attributes of one-person media and reuse. For this purpose, the investigator conducted an online survey with adults aged 19 or older who had experiences with watching one-person gaming broadcasting via PC, TV, or smartphone. The questionnaire was sent via SNS including Kakao Talk, Facebook, text message, and online community cafes, and 286 people filled it out voluntarily via the URL. Data collected from them was treated with SPSS 20.0 and AMOS 20.0 and tested for fitness for the entire model. Hypothesis testing led to the following conclusions: first, the study examined relations between the attributes of one-person media and perceived usefulness and found that reliability and intimacy had significant positive effects on perceived usefulness; secondly, reliability and intimacy from the attributes of one-person media had significant effects on reuse; thirdly, perceived usefulness had significant effects on reuse; and finally, perceived usefulness had mediating effects on relations between the attributes of one-person media and reuse.

체육수업에서 지각된 학습환경과 그릿의 관계에서 결과기대와 자기모니터링의 매개효과

송기현(Song, Ki-Hyun),임현묵(Lim, Hyun-Muk) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4

The purpose of this study analyzed the structural relationship between outcome Expectancy and self-monitoring grit according to learning environment in middle school physical education class, and tried to verify the mediating effect of outcome Expectancy and self-monitoring. subjects of this study were 500 middle school students in the metropolitan area, and 418 copies were used as final analysis data. data were processed using SPSS WIN Ver. 20.0 and AMOS 20.0 to perform confirmatory factor analysis, structural equation model analysis, and boot strap. Analysis result, First, the effort/challenge perceived environment and competency perceived environment of learning environment had a significant effect on outcome Expectancy, and threat perceived environment did not have a significant effect on outcome Expectancy. Second, the effort/challenge perceived environment of learning environment had a positive effect on self-monitoring. the threat perceived environment negatively affected self-monitoring. but the competence perceived environment did not have a significant effect on self-monitoring. Third, the outcome Expectancy did not have a significant effect on the grit. Fourth, self-monitoring had a significant effect on grit. Fifth, In the relationship between learning environment and grit, outcome expectation was not mediated, self-monitoring was mediated.

대학 스키, 스노보드 수업에서 지각된 지도자의 피드백과 동기-행동적 조절전략 및 지속의도의 관계

송기현(Song Ki-Hyun),허진영(Huh Jin-Young) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.3

The purpose of this study was to identify relationship among perceived teacher’s feedback, motivational-behavioral regulation strategies, and exercise adherence in participants of university ski and snowboard class. In order to obtain purpose of the study, participants of activity courses at D university (N=276) were recruited by using the convenience sampling technique. The data were recorded and analyzed using PASW Statistics 18.0 to perform frequency analysis, exploratory factor analysis, correlation analysis and Multiple Regress Analysis. Results are as follows. First, the negative nonverbal feedback of perceived teacher’s feedback has negatively influenced on self-efficacy, goal-orientation, and achievement value of motivational-behavioral regulation strategies. The positive nonverbal feedback has positively influenced on self-efficacy and achievement value. The positive general feedback has influenced on goal orientation of motivational-behavioral regulation strategies. Second, the knowledge performance of perceived teacher’s feedback has influenced on behavioral control and help-seeking of motivationalbehavioral regulation strategies. The negative nonverbal feedback has negatively influenced on behavioral control. The positive nonverbal feedback has positively influenced on help seeking. Third, the self efficacy, goal orientation, achievement value have influenced on intention to continuance. Fourth, the behavioral control and help seeking has influenced on intention to continuance. Fifth, the knowledge of performance has influenced on intention to continuance. The negative nonverbal feedback has negatively influenced on intention to continuance.