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김재언,김영민,이민구,김종빈,최태성,박민수 대한전기학회 2022 전기학회논문지 Vol.71 No.12
A refrigerator that maintains the appopriate temperature is an important factor for safe medicines and foods. Accordinly, the standards of the Food Safety Management Certification Standard (HACCP) are being strengthened. HACCP certification is immediately revoked if the management standards of critical management facilities are deviated from the implementation of the One-Strikeout System in 2015. Aging refrigerators are causing a numerous problems in recent summer operation. However, replacing all aging refrigerators is expensive and time consuming. It requires a high level of skill to inspect a condition of refrigerator only with limited pressure and temperature without special measuring equipment. Currently, on-site inspections and repairs rely only on experience and knowledge of operators. Therefore, unskilled workers face difficulties in inspection and repair. In order to solve this problem, this paper proposes a fault diagnosis method using PLC.
김재언,김도형 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.2
21세기에 접어들면서 본격적인 정보화 사회로의 진입이 가속화됨과 동시에 고품질의 전력을 요구하는 고기능 정보화 기기가 대량 보급/운용되고 있는 실정이어서 이를 위한 전력품질향상기기(Custom Power Deivces)의 개발과 보급이 진행되고 있다. 그러나, 국내의 경우 이리한 전력품질향상기기의 최적설계 및 제작에 필요한 성능평가기준이 마련되어 있질 않다. 따라서, 본 논문에서는 국내에 보급되는 고기능 정보화기기부하를 고려한 전력품질향상기기의 성능평가기준을 결정하는 방법을 제안한다. In the beginning of the 21st century, Custom Power Devices have been developed and applied to electrical power systems for supplying high quality electricity as the information society is speeded up and many information processing devices are diffused into electrical networks. But in Korea the performance level of the Custom Power Devices has not been established until now, which is necessary to design and make them optimally. This paper proposes a method for determining the performance level of the Custom Power Devices considering the characteristic of the high function information device and electrical power systems.