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원준희(June-Hee Won),정달호(Dal-Ho Cheong),오재윤(Jae-Yoon Oh) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, the new control algorithm is proposed that compensates instantaneously the active and reactive components of the input currents by the synchronous d,q axis conversion of a single-phase current in controlling the single-phase AC/DC parallel converters for a high speed train. The leakage inductance of a transformer was used as a boost inductance and the ripple of a transformer's primary current was reduced considerably by the parallel operation of the two converters with a proper switching phase-shift. The stable and fast control response characteristic is certificated by a simulation.
단상 AC/DC 병렬 컨버터 제어 알고리즘의 비교, 분석
원준희(June-Hee Won),이강희(Kang-Hee Lee),김윤호(Yoon-Ho Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, the algorithm which controls output voltage and power factor independently and the algorithm which controls output voltage with fixed unity power factor are compared and analyzed. These algorithms are applied to<br/> single-phase AC/DC parallel converters for a<br/> high speed train system. The control characteristic of the algorithms are compared and analyzed with respect to the output voltage and input power factor when system parameters vary.
R plasmid와 bla Gene을 이용한 병원 내 유행 ${\beta}$-lactam 내성 장내세균의 확인
설성용,원준희,김능희,유학선,이유철,조동택,김정완,Seol, Sung-Yong,Won, June-Hee,Kim, Neung-Hee,Yu, Hak-Sun,Lee, Yoo-Chul,Cho, Dong-Taek,Kim, Jung-Wan 대한미생물학회 2001 Journal of Bacteriology and Virology Vol.31 No.3
Clinical isolates of Enterobacteriaceae (189 Klebsiella, 61 Enterobacter, 32 Serratia, 19 E. coli, 7 Proteus, and 3 Citrobacter) from one university hospital were epidemiologically analyzed by using transferable R plasmids resistant ${\beta}$-lactam antibiotics including broad-spectrum cephalosporins. About 30% of E. cloacae and S. marcescens and about 5% of K. pneumoniae were resistant to one or more broad-spectrum ${\beta}$-lactam antibiotics including cefotaxim, ceftazidime, aztreonam, or cefoxitin but all isolates of E. aerogenes, K. oxytoca, and P. mirabilis were susceptible. Thirty-six conjugative R plasmids including 8 plasmids resistant expanded-spectrum cephalosporins were obtained from multiple resistant K. pneumoniae (19), E. cloacae (9), E. coli (4), and C. freundii (1). Thirty-one plasmids were subjected to R plasmid analysis and classified 20 different plasmid types. Among them 5, 2, and 2 plasmids belong to 3 different types respectively showed identical molecular size, endonuclease fragment pattern by Southern hybridization pattern by TEM-1 probe, pI value by isoelctric focusing, and also identical antibiogram and biotype of wild strains harboring plasmids. But all of plasmids resistant to cefotaxim, ceftazidime, aztreonam or cefoxitin showed different palsmid anlysis patterns. These results indicate that the epidemic strains of 3 clonal types had been present in this hospital and anlysis using transferable R plasmid and bla gene can be used to discriminate multi-resistant clinical isolates of Enterobacteriaceae.