• 한국대기환경학회지
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• 제18권4호
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• pp.317-325
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• 2002

An air pollution monitoring station has been operated at Tokchok Island since April 1999 to characterize the background atmosphere in the vicinity of the Yellow Sea. In this study, eight chemical species in PM$_{2.5}$ and three gaseous species were analyzed. A total of 53 samples were collected for the analysis of PM$_{2.5}$ and gaseous species from April, 1999 to April, 2001. The overall mean mass concentration of PM$_{2.5}$ was 20.8 $\mu\textrm{g}$/㎥ and the eight soluble ionic species accounted for about 46.8% of PM$_{2.5}$ mass. Approximately 80% of samples appeared to experience the chloride loss effect. Air pollutant sources of PM$_{2.5}$ measured at Tokchok Island were qualitatively identified by the principal component analysis. It was found that five principal components are secondary aerosol, soil, incineration, phase change of nitrate, and ocean.and ocean.

• 한국대기환경학회지
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• 제34권5호
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• pp.659-667
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• 2018

$NO_x$ and $SO_2$ are mainly generated in the combustion of fossil fuels, and they cause secondary aerosol formation and acid rain in the atmosphere. Many studies have been conducted on the wet scrubbing process which can simultaneously reduce $NO_x$ and $SO_2$ at relatively low temperature. In this study, we conducted an experimental study on wet scrubbing by using NaOH solution. Especially, this study focuses on $NO_x$ and $SO_2$ removal characteristics by varying $NO_2/NO_x$ ratio and $SO_2$ concentration.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2000년도 춘계학술대회 논문집
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• pp.191-192
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• 2000

최근 동아시아 지역의 산업의 발전과 함께 대기오염물질이 발생하여 인접국가간에 상호영향을 미치므로, 이들 오염물질들의 이동에 관한 정량적 파악과 영향에 대한 규명이 필요하다. 대기중의 입자상 이온물질중 질산염과 황산염의 경우 대부분이 인간활동의 결과로 유입된 NOx와 대기중의 SO$_2$가 대기 중에서 화학적 반응에 의해 형성된 2차 오염물질이다. 자동차, 공장의 가동 등으로 인하여 발생되는 이들 오염물질들은 국지적으로 기상조건에 따라 이동되고 있는 것으로 알려져 있고, 각 지역에서 측정을 비롯한 많은 연구가 이루어지고 있다. (중략)

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2000년도 춘계학술대회 논문집
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• pp.333-334
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• 2000

전세계적으로 온실기체에 의한 지구온난화 문제가 대표적 환경파괴현상으로써 크게 주목받고 있는 현실이다 이러한 온난화에 기여하는 주요 인자로 $H_2O$, $CO_2$, 오존, 에어로졸 둥이 알려져 있으며, 각국에서는 이들 물질의 발생 및 순환 메커니즘 둥을 규명하기 위한 연구가 활발히 진행되고 있다. 그중 에어로졸은 산란과 흡수에 따른 방사효과가 지구온난화 영향인자 중의 하나로써 주목받고 있다. 에러로졸의 방사효과에는 태양방사를 산란.흡수하는 직접효과와 함께 구름입자의 응결 핵이 되면서 구름의 광학적 성질을 변화시키는 간접적 효과가 있다. (중략)

• 한국대기환경학회지
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• 제31권6호
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• pp.520-529
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• 2015

The ambient $PM_{2.5}$ samples were collected by $PM_{2.5}$ sampler from September 2010 to December 2012 at Daegu University, Gyeongsan. A total of 260 samples were collected and 27 species were analyzed by inductively coupled plasma, ion chromatography, and thermal optical reflectance methods. Factor analysis identified four sources such as biomass burning source/secondary aerosol source, soil source, industry source, and incinerator source/mobile source. Also, backward trajectories were calculated using HYSPLIT 4 (Hybrid single-particle lagrangian integrated trajectory) model and PSCF (Potential source contribution function) model was applied to identify the possible source locations of carbonaceous species and water soluble ions species. PSCF results showed that the possible source locations of most chemical constituents measured in Gyeongsan were the industrial areas in the eastern coast of China, northeast regions of China, the Gobi Desert, and east sea of Korea.

• Journal of Korean Society for Atmospheric Environment
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• 제23권E1호
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• pp.29-38
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• 2007

A cylindrical tube connection that has a voltage difference and is separated electrically by an insulator was modelled. The penetration efficiencies of charged particles passing through the connector tube were investigated. Typically, as the particle size decreases and the applied voltage difference increases, the penetration efficiency decreases. To assess the effect of the electrode geometry, various lengths of electric insulator and aerosol flow rate with a fixed tube length and tube diameter were used when calculating penetration efficiencies. The comparison of penetration efficiencies for various electrode geometry setups suggests that the penetration efficiency can be described as a function of the product of applied voltage and electrical mobility of charged particles. The diffusion loss from this and previous studies are compared. Further, an explicit form for penetration efficiency is provided as a function of a new non-dimensional parameter, $Es(=Z_pV/U_{avg}W);\;P_{es}=0.2{\cdot}{\exp}(-Es/0.6342)+0.8{\cdot}{\exp}(-Es/4.7914)$.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2001년도 추계학술대회 논문집
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• pp.435-436
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• 2001

대기 중 에어로졸 입자의 크기 분포를 측정하는 기기 중 광학적 입자 계수기(Optical Particle Counter)는 0.3$\mu\textrm{m}$에서 25$\mu\textrm{m}$ 사이의 입자의 크기를 개개의 입자에 대한 산란광의 강도를 측정하여 그 강도와 미리 정해진 강도와의 관계에 의해 입자의 크기를 추정한다(Chun et al., 2001). 본 연구에서는 2001년 4월 제주 고산에서 실시된 ACE-Asia(Asian Pacific Regional Aerosol Characterization Experiment) 집중 관측 기간 중 광학적 입자 계수기(Optical Particle Counter; HIAC/ROYCO 5230)를 이용하여 측정한 이 기간 중 에어로졸 입자의 크기 분포의 특성을 황사시와 비황사시, 그리고 강수시와 비강수시로 나누고 그 특징을 비교하여 보았다. (중략)

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2001년도 추계학술대회 논문집
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• pp.356-357
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• 2001

대기 중의 에어로졸은 지구의 복사평형에 직ㆍ간접적으로 영향을 끼친다. 직접적인 영향으로는 에어로졸이 가시광선과 자외선 영역의 에너지를 산란 또는 흡수함으로써 기후에 영향을 미치며, 간접적으로는 microphysical process에 의한 구름의 특성을 변화시키거나 불균일적인 화학반응을 통해서 복사특성을 지니는 가스들을 변화시킴으로써 기후에 영향을 미친다. 이러한 복합적 영향에 의한 인위적 에어로졸의 복사강제효과는 온실가스와는 반대의 영향을 끼치며 그 양은 -0.4~-3.0 W/$m^2$로 온실가스에 상응하는 값을 지니고 그 양과 공간적 분포로 인한 불확실성을 가지고 있다. (중략)

• 한국대기환경학회지
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• 제13권4호
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• pp.269-284
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• 1997

The ambient concentrations of gaseous and particulate phase ionic species and gaseous organic species in the Yochon industrial estate were measured during the spring ans summer of 1996. A three-stage filter pack sampler was used to collect particles and gaseous species, and stainless steel air sampling containers were used to collect air samples for organic species analyses. The concentrations of ions in aerosol wree comparable to those measured in Seoul. Aerosols measured were acidic, thus, most volatile acidic species were in the gas phase. The concentrations of organic species were highly variable, implying those were strongly dependent on the emissions of organic species from petrochemical plants. The concentrations of a few hazardous organic components were higher than those in Seoul or some populated areas in USA.

• 한국대기환경학회지
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• 제12권3호
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• pp.279-287
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• 1996

Pressure drop and fractional collection efficiency of automotive cabin air filters were examined to obtain the basic data for the development of high performance domestic cabin air filters. Pressure drop of MA-V100 was higher than that of VF-V100, and it increased with the air flow rate. VF-V100 had longer time to rise the critical pressure drop than that MA-V100 had. Total collection efficiency of MA-V100 for initial and dust loaded conditions was higher than that of VF-V100. Also, fractional collection efficiency of MA-V100 for the fine particles was higher than that of VF-V100. Particla size distribution for the minimum collection efficiency ranged from 0.02 $\mu$m to 0.04 $\mu$m for MA-V100 and it ranged from 0.02 $\mu$m to 0.15 $\mu$m for VF-V100.