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RISS 인기검색어
- 검색키워드
- 저자 : 홍유덕(Y.D.Hong) (검색결과 4 건)
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홍유덕(Y.D.Hong),김종춘(J.C.Kim),조강래(K.R.Cho) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
In Korea, three way catalytic converter equipped cars have been produced by car manufacturers to satisfy more stringent exhaust emission standards since July, 1987. Until now, about 90 percent of registered passenger cars were switched to low emission cars and the exhaust emission from the cars reduced dramatically. But these low emission cars could emit much pollutants because of the deterioration of emission related parts, long driving distance, poor maintenance and bad driving habits. Therefore, periodic inspection and maintenance is needed to reduce the exhaust emission from the cars in use. In this study, 139 vehicles - 94 gasoline vehicles and 45 LPG vehicles - which classified with kinds and mileage were tested by CVS-75 test procedure to know the characteristics of exhaust emission from catalytic converter equipped cars in use.<br/>
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한반도 서해상으로 장거리 이동하는 SO₂의 농도 및 연직분포 특징
한진석,안준영,홍유덕,공부주,이석조,선우영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.5
This study was carried out to understand long-range transport of SO₂ using aircraft measurements for the identification of it's horizontal and vertical concentration and distribution pattern. Thirteen missions of aircraft measurements have been done around 37˚00′/124˚30′ from October 1997 to November 2001. Concentrations of SO₂ was 1.5~2.0 ppb in the below mixing layer, 0.6~1.1 ppb in the above mixing layer. SO₂was found to be relatively higher than marine background level, 0.08~0.2ppb, indicating the western coast being influenced by long-range transport except for the summer season. The vertical distribution of SO₂was classified into 3 groups using its vertical sounding and meteorology pattern; the first is linear decay pattern, the second is exponential decay pattern, and the last is gaussian distribution pattern in the below mixing layer, 2 patterns of linear decay and gaussian distribution patterns in the upper layer. It is founded that vertical distribution pattern is strongly dependent on meteorological condition, for example atmospheric stability and predominant air flow.
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2000~2002년 우리나라에서 관측된 황사의 화학 조성 및 특성
신선아,한진석,홍유덕,안준영,문광주,이석조,김신도 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
The ambient TSP data measured at Seoul, Incheon, Taean, Daegu, Busan in Korea were used to explain the chemical composition and general features of Asian Dust (AD) observed in Korea. 9 episodes out of 19 were sampled from 2000 through May 2002, and measurements were conducted covering ionic and metal components with mass concentration. The results showed that daily averaged mass concentration (TSP) during the AD episodes was 458 ㎍/m₃, and ionic and metal concentrations were 27.93 ㎍/m₃ and 71.7 ㎍/m₃, respectively, accounting for 6.1% and 15.5% of the total aerosol mass. TSP concentrations during episodes were varied from 120 to 1742 ㎍/m₃ according to the impact of Asian Dusts and had a tendency of showing higher values at sites in the west side of Korea, which can be explained by the effect of diffusion and deposition. In this study, ionic components like Ca (NO₃)₂, CaSO₄, NaNO₃, Na₂SO₄ were prominent types in secondary aerosol during AD periods and also indicated that V, Co as well as soil elements such as Ca, Fe, Mg, Mn, K correlated well with Al, while Cu, Cd, Pb, Zn didn’t agree well with it. In addition, enrichment factors (EFs) for each metal component were obtained to provide simple information about source contribution of Asian Dust, and the results were compared with those from other AD studies. In this study, the results showed that aerosol properties in Korea during the Asian Dust were considerably different from those of general atmospheric condition and specially varied from case to case rather than site to site, which implies that there are certain variations in the soil of source region, pathways of air mass, and meteorologicalcondition. For the enhanced study, those factors should be combined with the features of Asian Dust resolved from this study.
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한진석,문광주,류성윤,안준영,공부주,홍유덕,김영준 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.4
Size-segregated measurements of aerosol composition using X-stage DRUM impactor are used to determine the transport of natural and anthropogenic aerosols at Gosan site from 29 March to 30 May in 2002. Separation of ambient aerosols by DRUM impactor offers many advantages over other standard filtration techniques. Some of the most important advantages are the ability to segregate into details by particle size, to better preserve chemical integrity since the air stream doesn't pass through the deposit, to collect samples as a function of time, and to have a wide variety of impaction surfaces available to match analytical needs. Although the transport of Yellow sand is a well-known phenomenon in springtime, the result of measurement shows that not only soil dust but also anthropogenic aerosols, including sulfur, enriched trace metals such as Pb, Ni, Zn, Cu, Cr, As, Se, Hr, are transported to Gosan in springtime. This study combines the size- and time- resolved aerosol composition measurements with isentropic, backward air-mass trajectories in order to identify some potential source regions of anthropogenic aerosols. As a result, during the NYS period, the average concentration of PM_(10) was 46 ㎍/㎥. Si, Al, S, Fe, Cl, K, Ca were higher than 1,000 ㎍/㎥ and Ti was about 100 ㎍/㎥. The concentrations of Zn, Mn, Cu, Pb, Br, Rb, V, Cr, Ni, As, Se ranged between 1 and 70 ㎍/㎥. More than 50% of typical soil elements, such as Al, Si, Fe, Ca, Ti, Cr, Cu, Br, were distributed in a coarse particle range (5.0 ∼ 12μm). In other hand, anthropogenic pollutants, such as S, N, Vi, were mainly distributed in a fine particle range (0.09 ∼ 0.56μm). During the YS period, PM_(10) increased about 8 times than NYS period, and main soil elements, such as Al, Si, S, K, V, Mn, Fe also doubled in coarse particle range (1.15 ∼ 12μm). But Zn, As, Pb, Cu and Se, which distributed in the fine aerosols (0.09 ∼0.56μm), were on the same level with or decreased than NYS period. Finally, except the YS period, coarse particles (2.5 ∼ 12μm) arc inferred to be influenced by soil, coal combustion, waste incineration, ferrous and nonferrous sources through similar pathways with Yellow Sand. But line particles have different sources, such as coal combustion, gasoline vehicle, biomass burning, oil or coal combustion, nonferrous and ferrous metal sources, which are transported from China, Korea peninsula and local sources.
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