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이사영(SY Lee),오봉환(BH OH),김봉희(BH Kim),박현준(HJ Park),김길동(GD Kim),이승학(SH Lee),이미영(MY Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper presents PWM method which modulates two third period only during one cycle of power converter. This method is compared with the convention! sinusoidal modulation method applying to the power converter with large capacity necessitating low switching frequency. The presented modulation method enables to reduce power semiconductor rating, minimize switching loss, and improve the current wave form.<br/> <br/>
박기준(KJ Park),안태기(TK Ahn),이호용(HY Lee),김길동(GD Kim),한석윤(SY Han) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The standardization of the urban transit maintenance system consists of BOM System, maintenance parts code system, and accident/trouble code system standardization. This paper is described only the result of BOM System, maintenance parts code system, and accident/trouble code system standardization. The results of standardization are using urban transit maintenance IT system and apply Expert System, RAMS System, and DATABASE contents of various kinds.