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경북서부지방 가축에서 분리된 Salmonella 속균의 생물화학적 특성 및 혈청형
김규태 ( Kyoo Tae Kim ),김정화 ( Jung Hwa Kim ),우정희 ( Jung Hee Woo ),장영술 ( Young Sool Chang ),김대원 ( Dae Won Kim ),김봉환 ( Bong Hwan Kim ) 한국동물위생학회 2002 한국동물위생학회지 (KOJVS) Vol.25 No.3
The present study was conducted to investigate the prevalence, biochemical properties and serotypes of Salmonella organisms in the domestic animals in Western Gyeongbuk province during the period from January to December 2000. Salmonella spp were isolated from 51(1.62%) of 3,141 cases of domestic animals. Serotypes of isolates were S enteritidis 17(29.6% of isolates), S agona 11(20.3%), S rissen 8(14.8%), S gallinarum 4(7.4%), S derby 3(5.5%), S typhimurium 2(3.7%), S travis 1(1.8%), S montevideo 1(1.8%) and untypable 4(12.9%), in order. The majority of isolates were highly susceptible to amikacin, ampicillin, ciprofloxacin, cephalothin, chloramphenicol, trimethoprim-sulfamethoxazole, norfloxacin and gentamicin, whereas all isolates were resistant to bacitracin, erythromycin, tiamulin and tylosin, and the majority of them were highly resistant to penicillin, streptomycin and tetracycline.
연료첨가제 주입에 따른 승용차의 규제물질 배출특성 분석
정성운 ( Sung Woon Jung ),손지환 ( Ji Hwan Son ),홍희경 ( Hee Kyoung Hong ),성기재 ( Ki Jae Sung ),김정수 ( Jeong Soo Kim ),김정화 ( Joung Hwa Kim ) 한국분무공학회 2015 한국액체미립화학회지 Vol.20 No.4
This paper was designed to investigate emission characteristics of regulated pollutants (CO, HC, NOx and PM) from 134 diesel and gasoline passenger cars based on emission standards according to fuel additives. The experiments using chassis dynamometer were conducted under NEDC and CVS-75 modes. Comparison for fuel additive management and test between Korea, USA, EU and Japan, Korea was more strict than others. The fuel additives of this study was satisfied within fuel manufacturing standards. For with/without fuel additives according to diesel emission standards, NOx of EURO 4 and EURO 5 showed a relatively similar tendency. In the case of PM reduction rate, EURO 5 was over 20% increased than EURO 4.In the case of standard deviation/average ratio for gasoline vehicles, variation interval was big for LEV 23.3~58% and ULEV 31.6~56.4%. Following the imposition of stricter regulations (EURO 5 and ULEV), difference rate for standard deviation was big. Especially, in the case of diesel vehicles, difference rate for NOx 68% and PM 48% was most big. The results of present study will be of assistance in completing the legislative process and will provide basic data to set up emission standards for fuel additives in Korea.
대형경유자동차의 NO₂/NO<SUB>X</SUB> 비율과 NO<SUB>X</SUB> 배출특성에 관한 연구
정택호(Taek Ho Chung),김선문(Sun Moon Kim),문선희(Sun Hee Mun),홍희경(Hee Kyoung Hong),이승환(Seoung Hwan Lee),서석준(Seok Jun Seo),김정화(Joung Hwa Kim),정성운(Sung Woon Jung),김인구(In Gu Kim),이종철(Jong Chul Lee),이종태(Jong Tae 대한환경공학회 2019 대한환경공학회지 Vol.41 No.4
대형경유자동차에서 배출되는 NOx는 국내 NOx 배출량 중 높은 비율을 차지하고 있으며, NO₂는 인체에 유해하며 대기환경을 오염시키는 물질로 알려져 있다. 본 연구에서는 대형경유트럭과 대형경유버스에서 배출되는 NOx를 실시간으로 측정하였으며, 다양한 조건에 따른 NO₂/NOx 비율과 NOX 배출특성을 파악하였다. 실시간으로 NOx의 농도를 측정한 결과 NO와 NO₂의 농도는 높은 출력을 요구하는 가속구간에서 증가하는 것으로 나타났다. 시험모드별 대형트럭의 NOX 배출량은 WHVC>NIER 9>UDDS 순으로 낮은 평균속도에서 높게 배출되었다. 반면, 대형버스의 NOx 배출량은 평균속도가 증가할수록 높게 배출되는 것을 확인하였다. 엔진 상태에 따른 대형트럭과 버스의 NOX 배출량은 엔진 미가열조건에서 23%, 78% 높게 배출되었다. 대형트럭과 대형버스의 NO₂/NOx 비율은 엔진 가열조건에서 각각 0.7~1.0%, 7.7~7.8%로 확인되었다. 본 연구의 결과는 도로변대기측정망의 NO₂ 농도 산정을 위한 기초자료로 활용될 것으로 기대한다. NOx emitted from heavy-duty diesel vehicles has a high percentage of domestic emissions in Korea. It is known that the NO₂ emission was polluted the atmospheric environments and was harmful to humans. Therefore, investigation on NO₂//NOx Ratio and NOx Emission Characteristics of Heavy-Duty Diesel Vehicles were carried out. In this study, NOx emissions from heavy-duty trucks and buses were measured by chassis dynamometer for heavy-duty vehicle in real time. Also, NO₂/NOx ratio and NOx emission characteristics were analyzed by emission analyzer according to various conditions. It is revealed that NO and NO₂ concentrations were increased in the acceleration section from results of NOx concentration in real time. The NOx emissions of heavy-duty trucks in test mode was confirmed a high level in order the average speed, but NOx emissions of heavy-duty buses were increased as the average speed increased. The NO₂/NOx ratio of heavy duty trucks and buses was 0.7~1.0% and 7.7~7.8% at hot start engine condition. The results of this study will contribute to be used as basic data for the estimation of NO₂ concentration in the roadside air monitoring network.