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보조 스위치를 사용한 ZVS Two-Switch 포워드 컨버터에 대한 연구
정민혁(Min-Hyuk Jung),김용(Yong Kim),엄태민(Tae-Min Um),이규훈(Kyu-Hun Lee),이동현(Dong-Hyun Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this paper, a new soft-switching Two-switch Forward converter topology has been proposed. Compared with conventional two-switch forward converter, the proposed converter employs an auxiliary switch and a clamp capacitor to instead of two reset diodes, not only its duty cycle can exceed 0.5 to achieve wide range input voltage, but also soft switching can be achieved for all switches. Especially, voltage stress across main switches can be clamped at 1/2V<SUB>in</SUB>, voltage stress across auxiliary switch can be clamped at V<SUB>in</SUB>. In addition, due to clamp capacitor series with the transformer, duty ratio can be extended with equation [수식삽입]. Therefore, as a kind of better cost-effective approach, it is very attractive for high input, wide range and high efficiency application.
Boost 컨버터와 Half-Bridge 인버터를 결합한 단일전력단 전자식 안정기에 관한 연구
정민혁(Min-Hyuk Jung),김용(Yong Kim),배진용(Jin-Yong Bae),엄태민(Tae-Min Eom),조규만(Kyu-Man Cho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper presents the Electronic Ballast combine Boost Converter with Half-Bridge Inverter. A Boost Converter is used to control input power factor and a Half-Bridge Inverter is used to drive the fluorescent lamp. The two stages were unified to simplify the design. This electronic ballast presents simplicity of control, allowing the use of small switches when compared another topologies of ballasts.
김상혁 ( Sang Hyuk Kim ),정민혁 ( Min Hyuk Jung ),이강원 ( Kang Won Lee ) 충북대학교 사학회 2010 忠北史學 Vol.24 No.-
Yesandae(曳山臺) is comprehensive stage for puppet play direction in Chosun Period. We analyzed Korean and Chinese related artifacts for understanding of Yesandae`s power supply mechanism. We built the Yesandae`s 3D computer graphic model and miniaturized model based on related literature and artifacts. We also reproduced puppet`s simple motion which powered by Yesandae`s wheels.
건설생산성을 고려한 최적 작업준비시간 도출 - 공종 특성을 반영하여 -
박성은(Park, Seong-Eun),박문서(Park, Moon-Seo),정민혁(Jung, Min-Hyuk),김준영(Kim, Jun-Young) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2
Productivity is core factor to measure efficiency of performance in the construction industry. Although there are various types of preparatory works, Tool Time Meeting(TBM) has most positive impact on overall productivity. Since the aspect of TBM varies depending on the mode of operation, it is necessary to quantify efficiency of TBM and define standards reflecting the characteristics of work section. The purpose of this study is to derive the optimum work preparation time considering construction productivity by reflecting the characteristics of work section. As a result of the study, deriving correlation of optimized TBM duration and direct weight process has been proposed, and this process can be used to derive TBM reference time reflecting the characteristics of work section.