• Journal of Korean Society for Atmospheric Environment
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• v.5 no.2
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• pp.1-11
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• 1989

Sandy dust phenomena was observed from April 19 to 23, 1988 in Seoul. During this period it rained and the precipitation was collected to investigate the rain chemistry. This study was carried out to analyzed the chemical composition of precipitation by the measurements of conditivity, cations $(H^+, NH_4^+, K^+, Na^+, Ca^{2+}, MG^{2+})$, and anions $(SO_4^{2-}, NO_3^-, Cl^-, F^-, Br^-)$ which are believed to be the major ions playing an important role in the acidity of rain water. During the period of sandy dust phenomena the range of pH value and conductivity concentration of rainwater were 6.0-6.7, 172-254 $\mu \mho/cm$. The anions and cations concentrations increased and the orders of these concentrations were $SO_4^{2-} > Cl^- > NO_3^- > Na^+ > Ca^{2+} > NH_4^+ > Mg^{2+}$. THe principal chemical compounds of rainwater were estimated at $(NH_4)_2 SO_4, CaSO_4, NaCl, and MgCl_2$.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.478-484
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• 2009

Currently, the interests of shortage of water supply is on the rise. Even developed countries are also suffering from a drought and insufficient water supply. Likewise other countries, we do have same problem, but unfortunately we do not have any proper solution either. One of the ways suggested to settle the problem is using rain water that gets people's eyes. Rain water is evaluated such as a good way to blow the problem of water shortage out and unlimited resource. So, this study focused on the prospect of rain harvest system and possible economic effects if this system adopt in Main Stadium of Busan Asiad.

• Journal of Radiation Protection and Research
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• v.28 no.4
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• pp.337-342
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• 2003

On a basis of the washout model and concentrations of anthropogenic tritium in rainwater around the Wolsong site, the washout coefficients of tritium by rainwater were calculated, and the validity of washout deposition model are estimated. As the result of that, the washout coefficients in 10 sampling stations around Wolsong site were in the range of $2.9{\times}10^{-5}\;-\;16{\times}10^{-5}\;s^{-1}$ with the mean value of $7.21{\times}10^{-5}\;s^{-1}$. The validity of the washout deposition model was confirmed by comparing the observed data with the calculated ones.

• Advances in environmental research
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• v.2 no.2
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• pp.99-118
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• 2013

Rainwater runoff has been identified as a significant source of contaminants having tremendous impact on the receiving aquatic environment. In the present study, trace element transport by the surface runoff in the predominantly urban catchment of Guwahati city, India was monitored with a view to determine the chemical denudation rates of the land surface. A number of trace metals, namely Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were measured in the runoff after 70 major rain events within the city. Cadmium was found to be the least abundant metal and Iron was the most abundant metal in the runoff. The results are interpreted on the basis of temporal and spatial variations in their concentrations. These variations are quite large in some of the events and reflect changes in the local environmental setting, differences in water utilization, variations in runoff volume, gradient and quality.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.220-223
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• 2021

This paper concerns a flow control method that can reduce rainwater containing non-point contamination accumulated on road surfaces during initial rainfall. In early rainfall, non-point pollutants are blocked from entering rivers and oceans and flow to sewage treatment plants. Afterwards, rainwater, which has been removed from the non-point pollution source through jet lag, is safely flowing into the river.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.411-412
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• 2023

The purpose of this research and development is to develop a structure module that improves the efficiency and constructability of the layout structure as well as the design development of rainwater permeable storage tank blocks using inorganic binders and aggregates with the aim of reducing greenhouse gas (CO₂) with eco-friendly materials. In addition, for the efficient response to flooding of the developed permeable storage structure, we present a technical solution for combining drone mapping technology and flood monitoring technology that can analyze topographical factors in detail.

• Journal of Korean Society of Water and Wastewater
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• v.18 no.5
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• pp.547-557
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• 2004

• Journal of Korean Society of Water and Wastewater
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• v.18 no.3
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• pp.301-305
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• 2004

• Journal of Korean Society of Water and Wastewater
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• v.18 no.2
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• pp.99-109
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• 2004

• Asian Journal of Atmospheric Environment
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• v.11 no.2
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• pp.71-78
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• 2017

Monthly characteristics of rainwater chemistry at a coastal site in southwestern Japan were examined based on an eight year record. In the period November-May when rain was mainly caused by cyclones, the monthly mean concentrations of $nss-{SO_4}^{2-}$, ${NO_3}^-$, ${NH_4}^+$, $nss-Ca^{2+}$, $Na^+$ and $Cl^-$ over the eight years were 25.1-57.8, 9.9-25.0, 11.3-31.4, 5.5-18.7, 24.2-154.9 and $30.0-178.5{\mu}eq\;L^{-1}$, respectively. In June and July when rain was mainly caused by stationary fronts, i.e. Meiyu fronts, the concentrations were 14.4-20.7, 7.2-9.5, 7.7-12.9, 4.1-6.8, 21.7-33.6 and $26.4-40.5{\mu}eq\;L^{-1}$, respectively. In August and September when typhoons contributed substantial rainfall, the respective concentrations of $Na^+$ and $Cl^-$ were as high as 97.7-105.3 and $116.8-122.9{\mu}eq\;L^{-1}$, while the concentrations of other ions were low. These results indicate a large variation of monthly rainwater chemistry, which is basically dependent on the synoptic weather patterns causing rain. From later autumn to early spring, rain contains ions in high concentration and large variation ranges. In the Meiyu season, rain contains less ions which vary in a range much smaller than that in later autumnearly spring. In summer and autumn, the concentrations are low, except $Na^+$ and $Cl^-$ which can be large due to typhoons' contribution.