• Journal of Preventive Medicine and Public Health
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• 제22권2호
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• pp.283-289
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• 1989

This study was conducted to investigate the association of the occurrence of pediatric diseases with environmental, seasonal and atmospheric factors. The data were collected at 5 pediatric clinics in Seoul and the Department of Pediatrics of Yongin Severance Hospital from May 1986 to April 1987. The results were as follows: 1. Vacation periods had a great influence upon the occurrence of pediatric diseases. 2. The majority of pediatric diseases occurred mainly in spring and autumn, not in summer and winter. 3. The higher the average relative humidity was, the less diseases occurred : and the higher the maximum change of daily temperature, the more diseases occurred. 4. In summer, the pattern of diseases varied along with the environmental factors(eg., toilet).

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.189-192
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• 2005

Desertification is one of the main global environmental phenomena. It has resulted in deterioration environment and poor economy, and imposed threat to the surviving environment of the overall mankind. Therefore, creating of methods for monitoring and estimate of risk desertification are necessary. Early warning system is one of important ways for monitoring and forecasting of desertification. Remote Sensing and GIS technology are as suitable tools and methods for early warning system. In this aim, we have evaluated of applications of remote sensing and GIS in monitoring and estimating desertification process (case study in Fars Province of Iran). In this research, we have considered erosion and vegetation cover parameters as main factors affecting in desertification process. The result shows that remote sensing and GIS technology could be useful in evaluation of desertification as one method for desertification early warning. Also, Results suggested that erosion and plant cover are affecting in develop the desertification process in study area.

• 한국전산유체공학회지
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• 제3권1호
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• pp.63-72
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• 1998

The numerical simulations of flowfield and pollutant dispersion over two-dimensional hills of various shapes are described. The Reynolds-averaged Wavier-Stokes equations and concentration diffusion equation based on the gradient diffusion theory have been applied to the atmospheric shear flow over the bell-shaped hills which are basic components of the complex terrain. The flow characteristics such as velocity profiles of the geophysical boundary layer, speed-up phenomena, mean pollutant concentration profiles are compared with experimental data to validate the present numerical procedure and it has been found that the present numerical results agree well with experiments and other numerical data. It has been also found that the distributions of ground level concentration are strongly influenced by the source location and height.

• 한국대기환경학회지
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• 제1권1호
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• pp.33-41
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• 1985

In order to investigate the Phenomenon of Acid Precipitation, pH value and Anions of Fluroide, chloride, nitrite, phosphate, bromide, nitrate and sulfate were measured from the acid precipitations sampled around 7 districts over seoul area during period of 9 months from January till September, in 1985. From the distribution of pH value gatnered, acid precipitations were noticed during period from January till Aprill, and from as of April 22nd, situation gradually recovered. The average pH value till April showed comparatively low, ranging 4.0-5.0. The pH value of 4.5-5.6 in average over whole year reaches to similar level of those in Japan. Anion analysis revealed that the main factor of pH value in Seoul district attribute mainly to the sulfate ion and nitrate ion. Moreover, these Phenomena of acid precipitation in Seoul area appeared to concentrate on certain districts, and they are slowly moving toward other directions due to such factors as wind-velocity and directions.

• 한국대기환경학회지
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• 제12권5호
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• pp.593-596
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• 1996

The encironmental consequences of airborne mercury (Hg) release from waste incineration system are wellperceived. To provide some insights into those phenomena, we have assessed annual emission rates of Hg for several major incineration systems in Korea following the procedures developed abroad. The results of our computation, derived on the basis of dividing the whole amounts of annually incinerated wastes into municipal solid Wastes (MSW), and medical solid wastes (MDW), indicate that the extent of Hg release may be significant nationwide, possibly approaching a few tonnes of Hg per year basis. Knowing that the airborne transport and the resulting deposition of Hg can exert serious pollutions to the aquatic ecosystems, of particular fisheries, we are obliged to establish a stringent measure to confine the amount of Hg released via incineration.

• 한국대기환경학회지
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• 제8권1호
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• pp.52-57
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• 1992

The influence of soil particles on TSP transported from China contient to Seoul by the Yellow sand phenomenon was investigated from the analytical results of TSP during three years, April 1988 through May 1991. The TSP was collected by a high volume air sampler abour five times a month, and then analyzed by A.A.S. and UV-Visible spectrophotometry. During the Yellow sand phenomenon, the mean concentration of TSP at Seoul was about 578 $\mug/m^3$ and three times higher than that in the ordinary time which was about 194 $\mug/m^3$. The mean contribution of soil particles calculated by Al content to TSP was 28% in the ordinary time, but the degree of contribution jumped to about 60% during the Yellow sand phenomena. The concentration of soil particles transported from China continent to Seoul was estimated to be 175.1 $\mug/m^3$ on an average(104 $\mug/m^3-231 \mug/m^3$).

• 한국대기환경학회지
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• 제15권5호
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• pp.625-638
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• 1999

Air quality modeling for coastal urban region has been composed of a complex system including meteorological, chemical and physical processes and emission characteristics in complex terrain. In this study, we studied about an effect prediction for deposition phenomenon affecting on air quality in Pusan metopolitan metropolitan city. In air quality modeling including ship sources, a situation considered deposition process habe better result than not considered when compared with observed value. Air pollutants emitted into urban air during the daytime nearly removed through urban atmosphere polluted. Also these phenomena correlated concentration variation connent with sea/land breezes and terrain effect. Therefore we conclude that the concentration was low at daytime when deposition flux is high, and deposition effect on industrial complex and Dongrae region is considerable in particular.

• 한국대기환경학회지
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• 제13권4호
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• pp.307-317
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• 1997

Samples of fine particle $(d_P<2.5 \mum)$ were taken in Chongju area using a dichotomous sampler. The data set was collected on fifty-eight different days with 24 hour sampling period from October 27, 1995 through August 25, 1996. The samples were analyzed using a proton induced x-ray emission (PIXE) for Na, Mg, Al, Si, S, Cl, K, Ca, Ti, V, Cr, M, Fe, Ni, Cu, Zn, Br and Pb. Values of Fe, Ca, Si, Cu, K and Cl exhibit marked seasonal variations. Mean concentrations for this study had the following order S > Cl > Si > K > Al > Fe on fine particle. Concentrations of Ca, Si and Fe were higher during the spring season compared with any other season. These phenomena may be attributable to soil dust. Cl and K were higher in the winter, which may be explained by combustion of fossil fuel. Higher values for Cu and Zn in the Winter may be due to the combustion and incineration.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.255.2-255.2
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• 2014

Electrode erosion is indispensable for atmospheric plasma systems, as well as for switching devices, due to the high heat flux transferred from arc plasmas to contacts, but experimental and theoretical works have not identified the characteristic phenomena because of the complex physical processes. Our investigation is concerned with argon free-burning arcs with anode erosion at atmospheric pressure by computational fluid dynamics (CFD) analysis. We are also interested in the energy flux and temperature transferring to the anode with a simplified unified model of arcs and their electrodes. In order to determine two thermodynamic quantities such as temperature and pressure and flow characteristics we have modified Navier-Stokes equations to take into account radiation transport, electrical power input and the electromagnetic driving forces with the relevant Maxwell equations. From the simplified self-consistent solution the energy flux to the anode can be derived.

• 한국대기환경학회지
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• 제11권2호
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• pp.163-170
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• 1995

The STEM II(Sulfur Transport Eulerian Model II) was adapted to investigate air pollutant transport phenomena between Eastern China and Korea. The movement of the high concentration region was clearly identified for the sulfate but was mot visible for SO$_{2}$. The 10.sim. 16 times more amount of SO$_{2}$ is transported to Korea compared to that of the local emission while the amount of the sulfate transported to Korea is 1 .sim. 1.3 times more than that of the sulfate produced by photo-chemical reaction in Korea. APTIs(Air Pollutant Transport Indices) for SO$_{2}$ and sulfate are approximately 0.85, which implies that the most of the SO$_{2}$ and sulfate existed in Korea are transported from Eastern China.