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ISM 기기에 의한 디지털 방송 서비스 간섭 영향 분석
심용섭(Yong-Sup Shim),이일규(Il-Kyoo Lee),박승근(Seung-Keun Park),민경일(Kyoung-Il Min) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.2
This paper analyzes the interference effect of ISM(Industrial Scientific Medical) equipment on Digital Broadcasting Service in ISM frequency band. For setting up interference power of ISM equipment, CISPR(International Special Committee on Radio Interference) 11 radiation limit standard was used. Then, MCL(Minimum Coupling Loss) which is for worst case and MC(Monte Carlo) which is for statistic analysis considering mobility of digital broadcasting receiver are used to get protection distance. Finally, according to each channel number 14, 40, 60, protection distance of 184.97m, 104.67m, 73.79m were calculated separately for the worst case. The protection distance of 29m to meet 5% of interference probability was calculated for statistic analysis regardless of channels. As a result, this protection distance was suggested to protect digital broadcasting service from ISM devices.
A Study on Combustion Characteristics of Methyl/Ethyl Butyrate blend
김성우(Kim, Sungwoo),이민호(Lee, Minho),김정환(Kim, Jeonghwan),민경일(Min, Kyoung-Il),김기호(Kim, Kiho),임의순(Yim, Eui-Soon),정충섭(Jung, Choong Sub) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
This study is a part of the project that investigates a possibility of using methyl/ethyl butyrate as an alternative material of MTBE. To investigate characteristics of the two materials, a 2.0L 4-cylinders SI engine that was coupled to an 160kw EC engine dynamometer was used and operated several conditions. Two exhaust gas analyzer was used to measure CO, NOx and THC of after and before of a catalyst. Also, to compare combustion characteristics of the fuels a combustion analyzer was used for measuring pressure of inside of a cylinder. The results show no special difference between MTBE and the two materials from the emission and combustion characteristics aspect.
식물 재배용 대전력 LED 조명을 위한 무선 제어기 설계
주동만(Dong-man Joo),윤혜주(Hye-ju Yun),민경일(Kyoung-il Min),이일규(Il-kyoo Lee) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.1
In this paper, the design method of driving circuit for high power LED lighting and wireless control circuit is are proposed and measurement results are presented. The high power LED lighting controller was constructed with a micro-controller unit, the field-effect transistor, FET driver, and ZIGBEE transceiver. For the implementation of the driving circuit and wireless control circuit, performance parameters such as driving power, switching frequency, duty rate, lighting intensity were considered. As a result, driving power of 314W, the switching frequency of 10Hz ~ 25KHz, duty rate of 10 to 90% and lighting intensity of 0 ~ 300umol were obtained for driving circuit performance. The communication speed of 240kbps, communication distance of 100m in out-door and communication distance of 50m in in-door were achieved for wireless control circuit performance. The implemented wireless controller is available for High Power LED Light in Plant Glower.