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J. H. Bae(배정현),H. H. Lee(이현호),Y.-M. Choi(최영만) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Slot die coating is a versatile coating method which has been used widely in large display industry. In slot die coating, one of the coating qualities is coating uniformity. To evaluate the coating uniformity, a method of directly measuring the thickness of the coating after drying of the coating solution is mainly used. However, this method consumes a lot of time and cost, and uncertainty may occur when drying the coating solution. In this paper, the coating uniformity is estimated simply by measuring the flow rate discharged from the slot die nozzle. This method can be a quick evaluation for machine direction uniformity. Using a precision weighing cell, the amount of discharged fluid is weighed and monitored. From the weight data, the flow rate is estimated using filters or wavelet data processing. For verification, a prototype was manufactured using a lab-made precision weighing cell, a syringe pump and a needle nozzle. The validity of the proposed method was confirmed through experiments for various constant flow rates and fluctuated flow rates.
김수열(S.Y. Kim),이원교(W.K. Lee),장병훈(B.H. Chang),전영수(Y.S. Jeon),이세일(S.I. Lee),배정현(J.H. Bae) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
한전 전력연구원은 1990년대부터 FACTS(유연송전시스템 : Flexible AC Transmission System)을 연구해 온 이래 80MVA UPFC(종합조류제어기 : Unified Power Flow Controller)를 2003. 5월 신강진전력소관내 강진변전소에 준공하였다. 효성과 지멘스의 기술제휴를 통해 개발된 강진변전소 UPFC를 통해 FACTS 엔지니어링, 제어 알고리즘 및 유지보수 기술이 확보되었다. 초창기 안정화운전 기간동안 제어핵심기술과 일부예비품의 미확보가 가용율(Availability)에 큰 영향을 미쳤으나, 현재 강진 UPFC는 안정적으로 운전되고 있다. 본 논문에서는 그 동안의 강진 UPFC의 고장내용을 종합분석하고, 가용율을 정리하였다