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서충열(Chungyoul Seo),곽순철(Soonchul Gwoak),박정민(Jungmin Park),강대일(Daeil Kang),임윤성(Yunsung Lim),황춘식(Chunshik Hwang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Bio-diesels are getting interest recently because of there low environmental impact when used as alternative fuels for diesel engines. Futhermore, the engines would not require any significant modification. The tested diesel engine was fueled on blends of 5 and 20% soybean bio-diesel/ultra low sulfur diesel(ULSD)fuel. The emissions were analyzed for the regulated items such as CO, NOx, HC, and PM. The results of 5% biodiesel reduced carbon monoxide(CO) and nitrogen oxides(NOx) comparing to ULSD. while total hydrocarbons(THC) were increased. The addition of 20% bio-diesel(BD20) to ULSD has reduced carbon monoxide(CO), total hydrocarbons(THC) and particulate matter(PM) except nitrogen oxides(NOx) that was increased.
일부 수도권 지하철 내 극저주파 자기장(ELF-MF) 노출 특성 현황
정대관,정준식,이규목,박형규,이재원,서충열,이우석,권오상,구진회 한국냄새환경학회 2015 실내환경 및 냄새 학회지 Vol.14 No.1
In this study, ELF-MF levels of subway trains were measured to understand the status of the intensity of ELFMF. The measurement points for the train are selected in the center of each train compartment(pantagraph compartment, motor-driven compartment and the compartment that is not connected to any other electric equipment) using EMDEX II. ELF-MF levels of trains were measured from the starting to the terminal station in each lines(Seoul line 1-9, Incheon line 1, Incheon international airport line, Gyungui line, Bundang line, Gyeongchun line, Joongang line, Suin line). We found that the mean and range of ELF-MF levels in the DC power subway train are 2.4 and 0.1~125.9 mG, respectively, while the mean and range of ELF-MF levels in the AC power subway train are 10.4and 0.0~156.3 mG, respectively. Furthermore, the maximum ELF-MF level(156.3 mG) was lower than the reference level(ICNIRP 833 mG, 60Hz). The findings of this study in relation to the characteristics of ELF-MF for subway will be useful to derive the ELF-MF exposure coefficient from our living environment in a subsequent study.