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근사 계단 제어 변조로 동작하는 모듈형 멀티 레벨 컨버터를 위한 새로운 초기 충전 기법
김교민(Kyo-Min Kim),김재혁(Jae-Hyuk Kim),김도현(Do-Hyun Kim),한병문(Byung-Moon Han) 대한전기학회 2016 전기학회논문지 Vol.65 No.10
Recently the researches on Modular Multi-level Converter (MMC) are being highlighted because high quality and efficient power transmission are key issues in the High Voltage Direct Current (HVDC) transmission system. This paper proposes an improved pre-charging method for the sub-module capacitors in MMC that operates in Nearest Level Control (NLC) modulation. The proposed method does not require additional circuits or Pulse Width Modulation (PWM) techniques. The feasibility of proposed method was verified through computer simulations for a scaled 3-phase 10㎸A MMC with 12 submodules per each arm. Hardware experiments with a scaled prototype were performed in the lab to confirm the simulation results.
김병선 ( Byeong Sun Kim ),김교민 ( Kyo Min Kim ),김걸 ( Kirl Kim ) 한국도시지리학회 2012 한국도시지리학회지 Vol.15 No.1
The purpose of this research is to analyze the various issues related to U-City and suggest the policy directions for solving the problems of U-City. It looks into U-City issues by reviewing preceding literatures, identifies the relationship of U-City components by using causal loop map, and elicits the basic root of U-City issues. It also performs a survey to find out U-City residents` perception and analyzes their satisfaction to U-City services by using IPA. Based on the survey and IPA results, this research suggests the policy directions for solving the issues of U-City such as the making of the PR strategy for fortifying U-City residents` perception, the establishment of the introduction of public participation U-City, and the preparation of social scientific approaches for improving the quality of life in U-City.
U-City사업에 민간 참여 활성화를 위한 법 · 제도 지원방안 연구
이재용(Lee, Jae Yong),김교민(Kim, Kyo Min) 한국측량학회 2012 한국측량학회 학술대회자료집 Vol.2012 No.4
U-City사업이 본격적으로 추진되면서 U-City건설 및 운영비 조달의 어려움과 시민체감형 서비스의 부족 등 U-City 문제점이 발생되고 있다. 이런 문제를 해결하고 U-City의 지속적 발전을 위한 방안으로 민간사업자를 U-City사업에 참여시키는 방안이 논의되고 있지만 현재까지 민간사업자가 참여할 수 있는 법·제도적 지원이 미흡한 실정이다. 이에 본 연구는 민간사업자가 U-City사업에 참여하기 위한 법?제도 지원방안을 모색하고자 한다. After promoting ubiquitous city business, problems of ubiquitous city are occurred including difficulties of securing ubiquitous city construction and managing cost, insufficient ubiquitous service for citizen, and so on. Current discussion about activation of private participation to solve these problems usually do not consider legal system. Therefore, this study will discuss supporting plan for the activation of private participation in U-City construction based on legal system.