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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.
설계변수들의 통계적 특성을 이용한 철근 콘크리트 부재의 구조 안전성 평가
서대원(Seo Dae-Won),남호윤(Nam Ho-Yun),유석형(Yoo Suk-Hyeong),신성우(Shin Sung-Woo) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
The strength of reinforced concrete members may vary from the calculated or the nominal strength due to the variation in the material strength and dimensions of the element. Statistical description of the variabilities of loads and strengths are required in any studies regarding the safety of reinforced concrete members. Therefore, this paper recommend a number of values for the coefficient of variation of concrete, reinforcement, dimension and loads to be used in the probability analysis. Also, this study analyze reinforced concrete members by Advanced First Second Moment(AFOSM) method using statistical characterization of variables. This study shows that Bayes' theorem is an effective tool in updating prior probabilities when the value of a random parameter is known. Finally, the results in this paper contribute to the understanding of the limit states reliabilities implied in current design of reinforced concrete elements.
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.