http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
공기윤활시스템 적용 선박의 시운전 속도성능에 대한 불확실성 해석
서대원(Dae-Won Seo),오정근(Jungkeun Oh) 한국항해항만학회 2020 한국항해항만학회지 Vol.44 No.6
A sea trial of the speed performance test is the one of the most important means of verifying a ship s performance, and the International Organization for Standardization established a standard for this test in 2015. Environmental disturbances such as wind and waves are always present under real sea conditions, however, so it is impossible to accurately estimate delivered horsepower under ideal conditions. These disruptive influences also make it difficult to evaluate the positive effect of recently developed energy-saving devices. In this study, uncertainty analysis of improved speed performance was carried out using Monte Carlo simulation to confirm the energy-saving efficiency of a ship equipped with an air-lubrication system. The findings showed the average power saving to be 3.2%, with the expanded uncertainty of ± 2.7% at a 95% confidence level (k=2). 선박의 해상 시운전 중 속도성능시험은 선박의 속도를 입증하기 위한 중요한 시험항목 중 하나이다. 국제표준화기구에서는 2015년 시운전 속도성능시험에 관한 표준 가이드라인을 제정한 바 있다. 일반적인 해상상태에서는 바람과 파도등 환경적 외란의 영향이 언제나 존재하므로, 정확한 전달동력을 추정하기란 불가능 하다. 또한 외란의 영향으로 최근 개발되고 있는 에너지 절감장치의 개선효과를 정확히 평가하는 것도 쉽지 않다. 본 연구에서는 몬테카를로 시뮬레이션을 이용하여 공기윤활시스템을 장착한 선박의 동력 절감량에 관한 불확실성 해석을 수행하였다. 그 결과 공기윤활시스템 가동으로 3.2%의 동력이 절감되었으며, 절감된 동력의 확장불확도는 95% 신뢰수준 (k = 2)에서 약 ± 2.7 % 범위를 갖는 것으로 나타났다.
서대원(Seo Dae-Won),최효준(Choi Hyo-Jun),한범석(Han Byum-Seok),신성우(Shin Sung-Woo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.8
The conventional flat plate systems were designed and built to resist gravity loads only. Because, the conventional flat plate system was designed and built to resist gravity loads only, the slab-column connections this system may not be appropriate to sustain deformation reversals during an earthquake of moderate intensity. This paper presents an analytical approach to evaluation the vulnerability of reinforced concrete flat plate structures subjected to earthquake load. Nonlinear dynamic analysis and reliability evaluation were studied for three type of buildings, 5, 10, and 15 story heights with flat plate structural system. And, a model was developed to predict punching shear failures at interior slab-column connections based on experimental results. Based on the reliability analysis, the probability of failure of existing flat-plate system are presented for different soil conditions and peak ground acceleration varying from 0.05g to 0.3g. The reliability index for typical 5, 10 and 15 story with flat plate structural system was evaluated by the Monte Carlo simulation (MCS). Under seismic loading, the probability of punching failure increased with increasing expected peak ground acceleration and the number of stories in the building. Also, the local soil conditions have a significant effect on the probability of punching failure. Conclusively, the conventional building structures that were designed with flat plate slab system to resist gravity load only, slab-column connections of these building have showed punching failure in this study. So, it is needed to appropriate reinforcing detail to sustain deformation reversals during an earthquake of moderate intensity.