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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.
몬테카를로 기반의 무선랜과 전자 가격표시기 사이의 상호간섭 분석연구
윤혜주(Hye-Ju Yun),김승남(Seung-Nam Kim),이일규(Il-Kyoo Lee),민경일(Kyoung-il Min) 한국정보기술학회 2014 Proceedings of KIIT Conference Vol.2014 No.5
최근 전자가격 표시기가 매장 및 유통업체에서 활성화됨에 따라서 2.4GHz 의 동일 대역을 사용하는 무선랜과의 간섭현상이 발생하게 되었다 무선랜에 의한 전자가격표시기의 간섭영향을 분석하기 위해 간섭시나리오와 확장된 하타 전파모델을 설정하였다 몬테카를로 방법을 적용하여 시뮬레이션을 수행하여 무선랜 간섭으로 부터 전자가격표시기를 보호하기 위한 이격거리를 도출하였다. As ESL(Electronic Shelf Label) system is increased at the market, the interference between ESL system and WLAN(Wireless Local Area Network) at 2.4GHz becomes issue. The interference scenario and propagation of the Extended Hata Model was established to analyze the interference from WLAN into ESL system. Through simulation results based on Monte-Carlo principle, separation distance was obtained to protect ESL system from WLAN interference.