• KCID journal
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• v.4 no.2
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• pp.10-24
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• 1997

This study is to analyse the reliability of storm sewer in urban area by applying the reliability analysis method. Two methods (MVFOSM and AFOSM) are applied to 6 drainage area in Seoul city and risk-safety factor curves are derived. Because risk-safety f

• Proceedings of the Mineralogical Society of Korea Conference
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• 2000.05a
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• pp.43-43
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• 2000

• 한국석유지질학회:학술대회논문집
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• autumn
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• pp.36-36
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• 2000

• 한국석유지질학회:학술대회논문집
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• autumn
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• pp.14-14
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• 2000

• Proceedings of KHEA Conference
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• 1997.07a
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• pp.67-67
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• 1997

• Proceedings of KHEA Conference
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• 1997.07a
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• pp.96-96
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• 1997

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1999.04a
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• pp.8-8
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• 1999

• Journal of Korean Society for Atmospheric Environment
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• v.7 no.3
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• pp.156-168
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• 1991

The purpose of this paper is to develop a stochastic model for daily sulphur dioxide $(SO_2)$ concentrations prediction in urban area (Seoul). For this, the influence of the meteorological parameters on the $SO_2$ concentrations is investigated by a statistical analysis of the 24-hr averaged $SO_2$ levels of Seoul area during 1989 $\sim$ 1990. The annual fluctuations of the regression trend, periodicity and dependence of the daily concentration are also analyzed. Based on these, a nonlinear regression transfer function model for the prediction of daily $SO_2$ concentrations is derived. A statistical procedure for using the model to predict the concentration level is also proposed.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.631-634
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• 1999

A series of in-situ inspection and measurements have been conducted to estimate rebar corrosion incidence of freeway concrete bridges in Seoul metropolitan area. The results of this study have been analysed to identify the extent of chloride concentration and incidence of steel corrosion in various ages and in the different members of the structures. About 34% of the freeway structures had a value lower than - 350mV(vs CSE), so it could conclude that the excessive chloride concentration was a major cause of rebar corrosion.

• Journal of the Korean Statistical Society
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• v.14 no.2
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• pp.100-117
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• 1985

This paper describes an outline of the sampling design for crop area survey and product survey in Korea. The design attempts to from a double statification, to obtain an efficient allocation of the sample and to reduce the sampling error by establishign crop concentrated strata. The optimum numbers of sample field and sample plot are investigated. The design is made it possible to reduce the sampling errors as well as to reduce the sample size further than the present survey.