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도로변 초미세먼지의 실시간 질량농도 및 부피농도 측정을 이용한 시간별 밀도 분석-광흡수 eBC에 대한 OPS 보정 중심
김은영(Eunyoung Kim),서석준(Seokjun Seo),김선문(Sunmoon Kim),정성운(Sungwoon Jung),이용민(Yongmin Lee),오세호(Sea-Ho Oh),박규태(Gyutae Park),김경훈(Kyunghoon Kim),김정화(Jounghwa Kim),홍유덕(Youdeog Hong),이태형(Taehyoung Lee),배민석(Mi 한국대기환경학회 2018 한국대기환경학회지 Vol.34 No.6
Link, Michael F.,Kim, Jounghwa,Park, Gyutae,Lee, Taehyoung,Park, Taehyun,Babar, Zaeem Bin,Sung, Kijae,Kim, Pilho,Kang, Seokwon,Kim, Jeong Soo,Choi, Yongjoo,Son, Jihawn,Lim, Ho-Jin,Farmer, Delphine K. Elsevier 2017 Atmospheric environment Vol.156 No.-
<P>A vehicle fleet representative of passenger vehicles driven in the Seoul Metropolitan Region was investigated for primary emissions and secondary chemistry. Exhaust was photochemically oxidized in a flow reactor to determine the ammonium nitrate (NH4NO3) aerosol formation potential from vehicles of gasoline, diesel and liquid petroleum gasoline (LPG) fuel types. Secondary formation of aerosol NH4NO3, was larger than primary emissions for all vehicle fuel types except diesel, for which negligible secondary NH4NO3 production was observed. Although diesel vehicles emitted more primary nitrogen oxides than other vehicle types, ammonia emitted from gasoline and liquid petroleum gasoline fuels types limited the secondary production of NH4NO3. The results suggest that gasoline and liquid petroleum gasoline vehicles with three-way catalysts could be an important source of ammonia for NH4NO3 aerosol formation in ammonia-limited environments, including the Seoul Metropolitan Region. (C) 2017 Published by Elsevier Ltd.</P>
미디어 이용에 따른 건강정보 과부하가 건강정보 불신에 미치는 영향
김주미(Kim, Joomi),최정화(Choi, Jounghwa),박동진(Park, Dong-Jin) 한국광고홍보학회 2018 한국광고홍보학보 Vol.20 No.2
최근 과도한 건강정보에의 노출이 미디어 이용자의 건강에 미치는 부정적 영향에 관한 우려가 증가하고 있다. 이에 본 연구는 미디어 유형 및 이용 정도에 따라 건강정보 과부하(구체적으로, 건강정보 과잉과 건강정보 혼동) 양상이 어떻게 다르게 나타나는지, 그리고 이러한 과부하가 건강정보 불신에 어떠한 영향을 미치는지 살펴보고자 하였다. 전국 성인 남녀를 대상으로 진행된 온라인 조사 자료(N = 903)를 토대로 경로 분석 및 다중 회귀 분석을 실시하였다. 분석 결과, 미디어 이용 정도는 건강정보 과잉과 건강정보 혼동 모두에 유의한 영향 변인인 것으로 나타났다. 구체적으로는 온라인 매체 이용 정도가 건강정보 과잉 및 혼동에, 인쇄 매체 이용 정도가 혼동에 통계적으로 유의한 영향을 끼치는 것으로 확인되었다. 한편 건강정보 과잉은 건강정보 혼동을 통하여 건강정보 불신에 영향을 미치는 것으로 나타났다. 본 연구는 국내 미디어 이용자의 건강정보 과부하 유형을 실증적으로 검증함으로써, 이용자의 혼동을 줄일 수 있는 명쾌한 건강정보 제공에 대한 실무적 함의를 제시한다. There have been growing concerns about the negative effects of exposure to excessive health information on the health of media users. Therefore, this study explores how different are the aspects of health information overload (i.e., excessive health information and confusion of health information) depending on the type and usage of the media, and how health information overload influences on distrust of health information. Results from a path analysis and multiple regression analysis supported all of the established hypotheses. In particular, the results revealed that media use influence significantly on both excessive health information and confusion of health information. Confusion of health information significantly mediated the relationship between excessive health information and distrust of health information. Implications of these results for health communication practitioners and media users are discussed.
( Sungwoon Jung ),( Jounghwa Kim ),( Sangwoo Jeon ),( Jaehyun Lim ),( Sangil Kwon ),( Jeongsoo Kim ),( Gwinam Bae ),( Heekyung Hong ),( Meehye Lee ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Characterization of the particulate matter from three different diesel passenger cars in this study under the vehicle driving cycles and regulatory cycle were analyzed. The vehicles were measured in various vehicle speeds with the aim to verify the particulate number and mass with respect to the road traffic conditions. The total particle number emissions (PNEs) at the lower vehicle speeds increased gradually from the highway to the Seoul metropolis. The results showed that the peak size-segregated bin shifts to the larger particles as diluted exhaust gas is cooled. As the average vehicle speed decreases, the size-segregated peak of particle number concentration (PNC) shifts to smaller particles. The PM composition was mostly composed of both soluble organic fraction (SOF) and soot. The effect of the dilution temperature on the total PNC under the New European Driving Cycle (NEDC) was slightly higher than the dilution ratio. In addition, the nucleation particles (DP: ≤ 13nm) were confirmed to be more sensitive to the dilution temperature rather than other particle size ranges. Comparison with particle composition between vehicle speed cycles and regulatory cycle, sulfate was slightly increased at regulatory cycle, while other components were relatively similar. During cold start, effect of cold environment was an increase in semivolatile nucleation particles, but not solid particles. Research into particle formation dependent on dilution process from diesel passenger cars under the NEDC is important because of verifying impact on vehicular traffic and secondary aerosol formation in Seoul. The results of this study will contribute to improve air quality and human health in Seoul.
Jung, Sungwoon,Kim, Jounghwa,Kim, Jeongsoo,Hong, Dahee,Park, Dongjoo Editorial Dept. of Journal of Environmental Scienc 2017 JOURNAL OF ENVIRONMENTAL SCIENCES -BEIJING- Vol.54 No.-
<P>The objective of this study is to estimate the vehicle kilometer traveled (VKT) and on-road emissions using the traffic volume in urban. We estimated two VKT; one is based on registered vehicles and the other is based on traffic volumes. VKT for registered vehicles was 2.11 times greater than that of the applied traffic volumes because each VKT estimation method is different. Therefore, we had to define the inner VKT is moved VKT inner in urban to compare two values. Also, we focused on freight modes because these are discharged much air pollutant emissions. From analysis results, we found middle and large trucks registered in other regions traveled to target city in order to carry freight, target city has included many industrial and logistics areas. Freight is transferred through the harbors, large logistics centers, or via locations before being moved to the final destination. During this process, most freight is moved by middle and large trucks, and trailers rather than small trucks for freight import and export Therefore, these trucks from other areas are inflow more than registered vehicles. Most emissions from diesel trucks had been overestimated in comparison to VKT from applied traffic volumes in target city. From these findings, VKT is essential based on traffic volume and travel speed on road links in order to estimate accurately the emissions of diesel trucks in target city. Our findings support the estimation of the effect of on-road emissions on urban air quality in Korea. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.</P>
국내 EGR과 SCR 장착 중형트럭 대기오염물질 배출 특성
손지환 ( Jihwan Son ),김정화 ( Jounghwa Kim ),정성운 ( Sungwoon Jung ),유흥민 ( Heungmin Yoo ),홍희경 ( Heekyung Hong ),문선희 ( Sunhee Mun ),최광호 ( Kwangho Choi ),이종태 ( Jongtae Lee ),김정수 ( Jeongsoo Kim ) 한국액체미립화학회 2016 한국액체미립화학회지 Vol.21 No.3
NOx and PM are important air pollutants as vehicle management policy aspect. Medium-duty truck is the main source of the pollutants although the vehicle market share is only 3.5%. National emission portion of NOx and PM form the mobile sourece are 14% and 16% respectively. In this study it was investigated that characteristics of air pollutants emission on medium duty truck equipped with EGR and SCR system. Vehicle’s test reflected driving cycle on the chassis dynamometer, and applied test cycle was WHVC(World Harmonized Vehicle Cycle) mode. The test cycle include three segments, represent urban, rural and motorway driving. Based on the test results NOx, PM, HC were less emitted form SCR vehicle than EGR vehicle. And CO was less emitted form EGR vehicle than SCR vehicle due to CO oxidation reaction on DPF surface. And most air pollutants reduced as average vehicle speed increased. Pollutants were less emitted on motorway section than urban and rural sections. But highly NOx emission on motorway section was verified according to increased EGR ratio on fast vehicle speed. HC and CO additional emission was identified as 68%, 58% respectively during SCR vehicle`s cold engine start emission test. NOx additional emission was detected by 24% on SCR vehicle`s condition of engine cold start while not detected on vehicle equipped with EGR. SCR vehicle`s additional NOx emission was derived from low reaction temperature during engine cold start condition. medium-duty truck emission characteristics were investigated in this study and expected to used to improve air pollutants management policy of medium-duty truck equipped with SCR & EGR.