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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.
유연한 평판을 가진 밀폐계에서의 연성효과 분석과 발포알루미늄 흡음재를 이용한 방사소음 저감
서대원(D.W.Seo),홍정혁(J.H.Hong),오재응(J.E.Oh),이홍권(H.K.Lee),김상헌(S.H.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
This study put a focus on the identification of coupling effects between acoustic modes in the rectangular enclosure with a flexible plate and the vibration of plate. Analysis of structural -acoustic coupled system leads to the investigation of the interior and exterior sound field characteristics of an acoustically loaded rectangular cavity. To reduce the radiated noise. measured admittance of foamed aluminum is applied to the bottom wall in the cavity. Analytical results due to the foamed alumimum in the cavity showed the sound attenuation over 5dB in the interested frequency range over the fundamental acoustic natural frequency.<br/>
서대원(Seo Dae-Won),황기태(Hwang Kee-Tae),김재철(Kim Jae-Cheul),장극관(Chang Kug-Kwan) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The increased use of raised floor closely followed the change of technology from analog to digital equipment in the telecommunication and other industries. Raised floors are also found in control rooms in electric power water gas, and transportation facilities, and in banks and insurance companies. The rapid expansion of Internet servoce accelerated the use of raised floors. This paper will discuss issues related to the seismic performance evaluation methods of raised floors for equipment used in telecommunication facilities, electric power facilities, emergency services, and other applications.
서대원(Dae-Won Seo),이세진(Se-Jin Lee),오정근(Jungkeun Oh) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.1
Stabilizer fins are installed on each side of a ship to control its roll motion. The most common stabilizer fin is a rolling control system that uses the lift force on the fin surface. If the angle of attack of a stabilizer fin is zero or the speed is zero, it cannot control the roll motion. The Coanda effect is well known to generate lift force in marine field. The performance of stabilizer fin that applies the Coanda effect has been verified by model tests and numerical simulations. It was found that a stabilizer fin that applied the Coanda effect at Cj = 0.085 and a zero angle of attack exactly coincided with that of the original fin at α = 26°. In addition, the power needed to generate the Coanda effect was not high compared to the motor power of the original stabilizer fin.
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.