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서대원,김준식,박시홍,Seo, Dae-Won,Kim, Jun-Sik,Park, Shi-Hong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
This paper introduces a gate drive IC for power modules with shoot-through immunity. A new approach uses a bootstrap diode as a high-side voltage bias and a level shift function at the same time. Therefore, the gate drive circuit becomes a simple and low-cost without conventional level shift functions such as HVIC(High-Voltage IC), optocoupler and transformer. The proposed gate drive IC is designed and fabricated using the Dongbu-Hitek's 0.35um BD350BA process. It has been tested and verified with IGBT modules.
태권도 품새 수련이 초등학생의 자세 안정성및 기능성 운동 수행능력에 미치는 영향
서대원(Seo, Dae Won),박정민(Park, Jeong Min) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.12
본 연구는 초등학생 60명을 대상으로 태권도 품새 수련그룹(EG/30)과 태권도 일반 수련그룹(CG/30명)으로 나누어 태권도 품새 수련이 자세안정성 및 기능성운동수 행능력에 미치는 영향을 알아보기 위하여 수행된 연구이다. 태권도 품새 수련 후 자세안정성의 변화는 태권도 품새 운동 그룹에서 앞쪽 , 앞안쪽, 안쪽, 뒤 안쪽, 뒤쪽, 뒤 바깥쪽, 바깥쪽, 앞 바깥쪽에서 통계적으로 유의하게 증가하였으며, 태권도 일반 운동 그룹은 뒤쪽, 뒤 안쪽에서 통계적으로 유의하게 증가하였다. 또한, 그룹 간 차이에서는 사후검사에서 통계적으로 유의하게 증가하였다. 태권도 품새 수련 후 기능성운동수행능력에 관한 연구에서는 태권도 품새 운동 그룹 에서 카리오카, 동시수축, 크로스 오브 업 스텝, 한발멀리뛰기에서 통계적으로 유의한 차이가 나타났으며, 태권도 일반 운동 그룹은 한발멀리뛰기에서 통계적으로 유의한 차이가 나타났다. 그룹 간 차이에서는 사후검사에서 기능적 운동수행능력의 모든 변인이 통계적으로 유의한 차이가 나타났다. 위의 결과로 보아, 태권도 품새 수련이 초등학생의 자세안정성 및 기능성운동수행 능력의 변화에 긍정적인 효과가 있는 것으로 나타났다. 이는 최근 성장기 초등학생 들의 운동부족과 부적절한 생활 식습관으로 인한 신체불균형의 해소와 신체적 운동 수행능력 향상을 통한 건전한 신체활동과 발육발달에 효과적일 것으로 생각된다. This study was to investigate the effects of Taekwondo Poomsae exercise on Elementary school children s posture stability and functional exercise performance abilities in the Elementary school children s. The participants were divided into two groups: Taekwondo Poomsae exercise group (EG, n=30) and Control group (CG, n=30). The EG took part in the Taekwondo Poomsae exercise program for 12 weeks. The results of this study were as follows: First, there were significantly increased in SEBT-A, SEBT-AM, SEBT-M, SEBT-PM, SEBT-P, SEBT-PL, SEBT-L and SEBT-AL in EG compared with CG after 12 weeks. Second, there were significantly increased in carioca, co-contraction, shuttle-run, cross over up step and one-leg hop test in EG compared with CG after 12 weeks. As conclusions, this study confirmed that the Taekwondo Poomsae exercise program could improve the posture stability and functional exercise performance abilities of Elementary school children.
서대원(Dae-Won Seo),권오준(Oh-Joon Kwon),이승희(Seung-Hee Lee) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Typical cross sections of the rudder are modified to implement the Coanda effect and the consequent changes invoked in the flow fields around the sections are carefully examined for the purpose of finding the shapes of Coanda foils showing the better performance. Subsequently, the lift characteristics of the Coanda foils at the various attack angles have been numerically studied. In the process, special attention has been given to the influence of the jet slit and radius of trailing edge on the lift characteristics of the Coanda foil applied USB(Upper Surface Blowing) and CC(Circulation Control) respectively.. Based on the two dimensional results above, the rudder of KVLCC2 is modified to adopt the Coanda effect(USB, CC). Experiments and simulations on flow fields around the Coanda rudder were performed to investigate the effectiveness of the Coanda device on the enhancement of the rudder performance at a range of jet momentums and rudder angles. It is found that the rudder performance of the ship is enhanced considerably with application of the Coanda effect
태권도 심판의 직무스트레스와 번아웃 및 직무만족의 관계
서대원(Seo Dae-Won),심영균(Sim Young-Kyun),윤정욱(Yoon, Jung-Wook) 세계태권도문화학회 2019 세계태권도문화학회지 Vol.10 No.2
The purpose of this study was to investigate the relationship among referee job stress, burnout and job satisfaction of Taekwondo referee. In order to achieve this, a sample of 200 is drawn out of the in korea Tawkwondo association and seoul⋅gyeonggi-do taekwondo association. Data acquired from 22 people are excluded due to inconsistency in their responses. Therefore, the data of 178 people is used for a final analysis. the acquired data is analyzed through the correlation and multiple regression analyses from the SPSS 23.0 program. The results obtained from this process are as follows. First, Taekwondo judge s judgment job stress was found to affect burnout. Second, Taekwondo judge s judgment job stress partially affects job satisfaction. Third, Burnout partially affects job satisfaction. It is meaningful to provide the basic data for the improvement of the treatment of Taekwondo referee and the improvement of the work environment through the result of this study.