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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society for Atmospheric Environment
Journal Basic Information
Journal DOI :
Korean Society for Atmospheric Environment
Editor in Chief :
Volume & Issues
Volume 15, Issue 6 - Dec 1999
Volume 15, Issue 5 - Oct 1999
Volume 15, Issue 4 - Aug 1999
Volume 15, Issue 3 - Jun 1999
Volume 15, Issue 2 - Apr 1999
Volume 15, Issue 1 - Feb 1999
Volume 5, Issue 4 - 00 1999
Volume 5, Issue 3 - 00 1999
Volume 15, Issue E - 00 1999
Selecting the target year
Numerical Simulation of the Wind Flow Over a Triangular Prism with a Porous Windbreak
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 223~233
The wind-flow characteristics over a two-dimensional triangular prism with a porous windbreak are numerically investigated. The geometry is a simplified model of large outdoor stack with a frontal wall-type windbreak which is used to prevent particle dispersion by reducing wind speed over stak surface. In the present numerical model, the RNG k-
model, the orthogonal grid system and the QUICK scheme are employed for the successful simulation of separated flow. The predicted results are compared and validated with the associated wind-tunnel experiments. In addition, the trajectories of dispersed particles and their sedimentation characteristics are quantitatively investingated using a Lagrangian turbulent-dispersion model.
A Study of Workplace Air Quality in the Eastern Seoul
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 235~247
This study was performed to investigate what was the most serious occupational factors in small scale industries. Twenty-three occupatonally hazardous substances were measured at the five workplaces in the Eastern Seoul during 1995∼1996. Total of 2,020 samples were analyzed by either GC/FID for organic vapors or AAS for heavy metals. From the results of this study noise was the most serious factor at the selected workplaces. Noise level in the metal processing, the printing, and the auto repairing industries exceeded the 8 hr PEL by 19.7%, 13.6%, and 11.6%, respectively. Mean concentrations of toluene in the shoe making and the printing industries exceeded the assessment crieterion by 6.0% and 3.8%, respectively. Further study of risk assessment of occupational exposure may be required to protect workers from hazardous working conditons.
Effect of Additives on Catalytic Activity in Thermal Catalytic De-NOx Process
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 249~255
We sdudied effect of additives on catalytic activity in thermal catalytic de-NOx process which was composed of thermal reduction, catalytic reduction and catalytic oxidation stage. Pd-Pt/
catalysts with the addition of transition metals(Co, Cu, Fe, Ni, W, Zn, Zr) and rare earth metals(Ce, Sr) were prepared by the conventional washcoating method. Those catalysts were characterized by CO pulse chemisorption, ICP,
adsorption, SEM and XRD. The effect of catalyst additives on NOx removal for diesel emission was studied in thermal catalytic de-NOx process at reduction temperature(350~50
), space velocity(5,000~20,000
) and the engine load(0~120kW). The concentraton of CO,
, NO and
in the exhaust gas increased with the engine load. On the other hand the concentration of
decreased. The de-NOx activityof all prepared catalysts increased with respect to high CO and low
level in the thermal reduction stage of the process. Insertion of Ce to Pt-Pd/
catalyst showed the best activity of all the catalysts under these experimental conditions. De-NOx catalysts are effective to remove CO in addition to NOx in the catalytic reduction stage.
Statistical Analysis of the Meteorological Elements for Ozone and Development of the Simplified Model for Ozone Concentration
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 257~266
In order to analyze the effect of meteorological elements on ozone concentration, we carried out cross-correlation of the elements with ozone concentraton, and time series analysis on them. As a result, it revealed that temperature, wind speed and humidity are not independent variables with ozone concentrations, and also, solar radiation and mixing height are the major elements that affect them. We developed models for ozone with solar radiation and mixing height as dependent variables to verify the effect of major meteorological elements. The predicted ozone concentration has strong correlation coefficients, So, We could conclude that we can predict ozone concentreation only with solar raidation and mixing height as dependents.
Studies of High-Ozone Episodes in the Greater Seoul Area between 1990 and 1997
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 267~280
To investigate the characteristics of high-ozone occurrences in the Greater Seoul Area(GSA), three high-ozone episodes were selected, for which the ozone warning for concentration above 120 ppb might be issued. The selection was on the basis of morning wind directions and speeds, and daily maximum ozone concentrations measured between 1990 and 1997. The episodes chosen to meet selection criteria were seven days in July 1992, nine days in July 1994, and three days in August 1994, as respectively characterized by southwesterly, easterly, and calm winds in the morning. However, more than 80% of high-ozone days in the GSA were associated with calm winds and the concomitant accumulation of local emission in the morning, rather than being due to transport of ozone or its precursors. This is believed to be the primary reason why ozone concentrations in the GSA varied in a completely different manner even between adjacent monitoring stations. Several premises for initiating research studies for resolving these local variations of ozone concentrations in the GSA are also discussed.
Development of a New E-
Turbulence Model for Analysing the Air Flow Field within an Urban Street Canyon
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 281~289
A new E-
turbulence numerical model is proposed for analysing the turbulent air flow field within are urban street canyon. In this model the equations of eddy viscosity and energy dissipation ae reformed by considering the Kolmogorov time scale and streamline curvature effect. Application results of the new E-
model have been compared with those of standard E-
model and Yang and Shih's one, which are commonly used ones in engineering fields, and with field experiment results of DePaul and Sheih. The new model appears to be generally superior to other both models in the prediction of an air flow field within street canyon.
Study of Deposition Flux of Dustfall and Metallic Elements in Western Coastal City, Kunsan, Korea
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 291~303
The purpose of this experimental study is to investigate seasonal deposition flux variations of the total dustfall and various inorganic elements in it. Total of 84 dustfall samples were collected from September, 1997 thur August, 1998 at 7 different sites in Kunsan. Each sample was analyzed by an AAS to determine the levels of 5 inorganic elements Zn, Cd, Cr, Fe and Pb. Deposition fluxes, soluble/total fractions for each element were extensively investigated. Estimated depositon fluxes of dustfall and elements in Kunsan were in the range of 37.5~45.1 ton/
/yr for dustfall, 43.5~81.8kg/
/yr for Zn, 6.6~11.0kg/
/yr for Cd, 44.8~110.0kg/
/yr for Cr, 223~323 kg/
/yr for Fe, 10.9~22.3 kg/
/yr for Pb, respectively. Thus, the estimated average total deposition fluxes of dustfall in Kunsan(376.35
) per day were 43.3 ton and 58.6 kg for Zn, 8.9 kg for Cd, 80.6 kg for Cr, 293.8 kg for Fe and 14.1 kg for Pb, respectively.
Characteristics of Acidic Air Pollutants and
Species in Seoul-Metropolitan Areas Using an ADS
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 305~315
The annular denuder system(ADS) was used to determine characteristics of acidic air pollutants and
species in Seoul-metropolitan areas. All measurements were done simultaneously in downtown(Kwanghwamun, Mullae, Chamshil, Ssangmun dongs) and outskirts(Puch n, Kuri cities) during four seasons. The samples were analyzed using ion chromatography for gas-phase matters(HCl,
) and particulate phase matters(
) and was measured fine particles(
). The seasonal mean concentrations of HCl, HNO2, HNO3 and SO2 in downtown and outskirt areas were very similar. All chemical species monitored from this study showed seasonal variations. Nitric acid(HNO3) and Nitrous acid(HNO2) were showed higher concentrations during the summer.
in the particulate phase matters were higher levels during the winter months. The concentrations of these components were 54.8, 3.82, 2.49, 1.80 and 1.02
A Study on the Estimation of Exhaust Emission by Nonroad Construction Equipments
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 317~325
The demand of diesel engine on the construction equipment has been rapidly increased because of high thermal efficiency and fuel economy. The exhaust emission from nonroad vehicles equipped with diesel engine such as construction equipment, ship, and agricultural equipment, etc. Which are known to be harmful to human health and environment, has not been regulated in our country. But the regulation for nonroad vehicle has been already progressed in advanced country. So we investigated the contribution ratio of air pollution by construction equipment in order to establish the exhaust emission management strategy for nonroad vehicle. Based on the statistical data for construction equipment, 5 kinds of equipment are selected and tested in the engine dynamometer to determine the emission factor. And the amount of air pollutant from construction equipment are calculated by using of the emission factor and recommended exhaust emission standard for construction equipment.
Determinaton of Chloride Ion Captured into Strong NaOH Solution from Chimney by Capillary Electrophoresis
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 327~333
Determination of chloride ion in concentrated NaOH solution by capillary electrophoresis has been studied. The analysis was performed by indirect UV absorption detection using chromate buffer at 254nm. The matrix effect of the sample has been observed so that the sensitivity in strong NaOH solutaion has decreased up to 10% of that in distilled water. The pH effect of the sample on the sensitivity of CE peaks has been investigated. The method for increasing the sensitivity have been investigated and the optimum pH and concentration of the buffer were 7.5 and 10mM, respectively. A cationic surfactant cetyltrimethylammonium bromide(CTAB), was added to a buffer solution in order to reverse the electroosmotic flow(EOF) in the capillary. This results in a short analysis time and better peak shapes. Using this optimum condition, the determination of chloride ion in real environmental sample has been performed, which is captured in strong NaOH absorbent prepared for absorbing gas from chimney. The standard addition method has been applied for the quantitative analysis, and it was obtained the good reproducibility.
Review on the Air Quality Modeling in Korea
Journal of Korean Society for Atmospheric Environment, volume 15, issue 3, 1999, Pages 335~366