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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.
서대원(Seo Dae-Won),고정오(Ko Jung-O),이승희(Lee Seung-Hee) 한국항해항만학회 2012 한국항해항만학회지 Vol.36 No.10
최근 아시아의 물류산업은 중국경제의 급부상과 함께 빠른 속도로 성장하고 있으며, 전 세계적으로 물동량이 계속적으로 증가하고 있는 상황에서 물류비용 절감을 위하여 다양한 연구가 활발히 수행중이다. 근해운송시스템은 연안해운을 중심으로 두 가지 이상의 수송연계 수단을 효율적으로 이용하여, 국제간 고부가 가치 물류 시스템을 창출하는 시스템으로써 유럽에서 상당한 성과를 올리고 있다. 따라서 우리나라에 알맞은 근해운송시스템을 도입하기 위해서는 효율적인 선박, 항만, 컨테이너 하역 및 운송 장비, 터미널 운영 및 관리시스템 기술, 화물 정보 추적 및 통신 분야의 요소 기술 개발이 요구된다. 본 논문에서는 현 단계의 요소기술 현황을 살펴보고, 앞으로 나아가야 할 공학적 기술에 대한 시사점을 제시하고자 한다. Recently, the logistics industry in Asia is growing rapidly mostly with Chinese economic development. A variety of studies have been carried out to reduce the logistic cost under the situation that the global freight traffic continues to increasing. The Short Sea Shipping(SSS) system, a multi modal transport system centered around coastal shipping to realize high value-added logistics, achieved considerable success in EU. To implement the SSS system in Korea, it is necessary to develop the various essential technologies related to development of efficient ships and port facilities, including equipment for loading and unloading containers, operating and managing systems for freight terminals and technologies for tracking and securing containers. The present paper focuses on the survey of the current essential technologies available for implementation of the SSS system and suggests the direction of future development in the technologies.
태권도지도자의 번아웃(Burnout)이 직무만족 및 이직의도에 미치는 영향
서대원 ( Seo Dae-won ),김희정 ( Kim Hee-jung ),장순호 ( Jang Soon-ho ) 국기원 2018 국기원태권도연구 Vol.9 No.2
본 연구는 태권도지도자의 번아웃(Burnout)과 직무만족 및 이직의도의 관계를 규명하여 스포츠선수 지도자들 스스로 자신의 번아웃 상태를 점검하는데 활용하고 번아웃을 유발하는 환경을 정화하는 대안을 제시하는데 목적이 있다. 연구의 대상은 2017년도 제98회 전국체육대회에 참가한 태권도선수 지도자를 모집단으로 선정하였으며, 편의표본추출법을 이용하여 176명 표본을 추출하였다. 추출하였다. 수집된 자료는 SPSS 22.0를 이용하여 빈도분석, 탐색적 요인분석, 신뢰도분석, 확인적 요인분석, 상관관계분석 및 다중회귀분석을 실시하였으며, 다음과 같은 결론을 도출하였다. 첫째, 태권도지도자가 인식하는 번아웃이 직무만족에 미치는 영향을 검증한 결과 번아웃 하위요인의 신체적 고갈과 인간관계 불화 요인이 직무만족에 유의한 영향을 미치는 것으로 나타났다. 둘째, 태권도지도자가 번아웃의 하위요인 중 신체적 고갈과 평가 및 대우 불만이 이직의도에 유의한 영향을 미치는 것으로 나타났다. 셋째, 태권도지도자의 직무만족이 이직의도에 유의한 영향을 미치는 것으로 나타났다. The purpose of this study is to check Taekwondo coaches’ burnout level and to suggest alternatives to purify the environment that occur coaches’ burnout by verifying the relationship among burnout, job satisfaction and turnover intention of Taekwondo coaches. Using the convenience sampling method, the researchers surveyed 176 Taekwondo coaches who participated in 98th Korea National Sports Festival. Within the collected data, researchers performed frequency analysis, EFA, internal consistence reliability analysis, CFA, correlation analysis, and multiple regression analysis by SPSS 22.0. Based on the results, researchers found out three facts. Firstly, Physical depletion and human relations friction, the dimensions of burnout are positive predictors to job satisfaction. Secondly, 3 dimensions of burnout, hysical depletion, rating and service complaint are positive predictor to turnover intention. Lastly, Job satisfaction is positive predictor to turnover intention.
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.
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.