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이강주(Kang-Ju Lee),구성영(Seoung-Young Koo),김동욱(Dong-Wook Kim) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
본 논문은 현대중공업에서 추진하고 있는 1.65MW급 풍력터빈에 적용된 이중여자 권선형 유도발전기 제어를 위한 핵심장치인 전력변환 장치 기술개발에 대해 기술한다. 1.65MW DFIG 제어를 위해 Back-to-back IGBT Converter를 설계하고, 방열을 위해 수냉식 구조를 갖는 전력스택을 채택하였으며, 풍력터빈에 의해 발전된 전력을 계통에 연계하기 위한 제반 기술과 Grid-code에 대응하기 위한 제어알고리즘등이 반영된다.
입력전류 주입을 이용한 PWM 컨버터의 직류 커패시터 용량 추정
이강주(Kang-Ju Lee),이동춘(Dong-Choon Lee),석줄기(Jul-Ki Seok) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, a novel on-line dc capacitance estimation method for the PWM converter is proposed At no load, Input current at a low frequency is injected, which causes dc voltage ripple with the ac voltage and current ripple components of the dc side, the capacitance can be calculated Experimental result shows that the estimation error is less than 2%.
3상 AC/DC/AC PWM 컨버터의 DC-Link 커패시터 용량 추정
이강주(Kang-Ju Lee),이동춘(Dong-Choon Lee),석줄기(Jul-Ki Seok) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, the novel method is proposed to measure the capacitance of the dc link capacitor<br/> Advantage of the method is not to separate capacitor from 3-phase AC/DC/ AC converters in the proposed method, a specific low frequency current is injected to oscillate the voltage of dc capacitor at no load condition The capacitance of dc capacitor is calculated with the effective values of this ripple voltage and current The validity of the proposed method is confirmed by PSIM simulation.
이강주(Kang Ju Lee),한경택(Kyung Taek Han),윤인섭(En Sup Yoon) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper presents the simulation architecture and strategy for dynamic simulation of chemical process and describes key features of developed dynamic simulation system, MOSA (Multi-Objective Simulation Architecture). A plant structure may be partioned into several strong coupling units, called cluster. If this cluster is solved simultaneously, it is possible to simulate whole plant without introducing convergence problem of tear streams. In this study, a flexible modular approach based on clusters was proposed as a promising architecture for dynamic chemical process simulator.
이강주 ( Kang Ju Lee ),이나경 ( Na Gyung Lee ),주현정 ( Hyun Jeong Ju ),박선화 ( Sun Hwa Park ),임차영 ( Cha Young Lim ),오효원 ( Hyo Won Oh ),이흥수 ( Heung Soo Lee ) 대한예방치과·구강보건학회 2013 大韓口腔保健學會誌 Vol.37 No.4
Objectives: This study investigated the busyness of dentists and analyzed factors related to busyness in these professionals. Methods: The subjects were 243 practicing dentists. Surveys were carried out via mail. Busyness was measured by using the Mumma scale. The data were analyzed using the Kruskal-Wallis test. Results: The dentists` busyness index was 1.91. Of the participants, 40% of practicing dentists wanted more patients, 30.8% did not overwork but did not want more patients, and 27.1% overworked and did not want more patients. The busyness index was significantly related to the number of dental hygienists and dentists. However, it did not differ with respect to the number of assistant nurses. Conclusions: The busyness index should be considered when developing relevant human resource plans.