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조위변화를고려한 해상처분장 2열 연직차수공에서의 오염물질 이동특성 평가
채광석(Kwangseok Chae),오명학(Myounghak Oh) 한국연안방재학회 2020 한국연안방재학회지 Vol.7 No.3
Vertical hydraulic barrier is essential component to prevent leachate leakage in offshore containment facilities. Double steel pipe sheet pile is one of effectively used as vertical hydraulic barrier in Japanese offshore waste landfill sites. In this study, two-dimensional finite element analysis was performed to evaluate contaminant transport characteristics considering advection-dispersion-diffusion through double steel pipe sheet pile according to tidal fluctuation and different water level in landfill by using SEEP/W and CTRAN/W. Numerical analysis results indicate that water level in landfill should be maintain similar or lower compared with sea water level to prevent the leakage from landfill to sea. In addition, double steel pipe sheet pile was effective to prevent contaminant leakage to outside sea since filling zone between two barrier act as buffer zone for spreading contaminant.
수치해석을 통한 해상처분장 연직차수공 안정성 및 지반 내 흐름특성 평가
채광석(Kwangseok Chae),오명학(Myounghak Oh) 한국연안방재학회 2021 한국연안방재학회지 Vol.8 No.2
Preventing leakage and structural stability of vertical barrier at offshore containment facilities are very important. Two-dimensional numerical analysis were performed to evaluate seepage and flow characteristics regarding to different embedded depths and hydraulic permeability of vertical barrier. In addition, stress and displacement at corner of vertical barrier were evaluated by using 3-dimensional numerical analysis. The effluent flux in the case of vertical barrier with insufficient embedded depth was significantly increased by 200 ~ 240 times compared with the case of embedded barrier in low permeable clay layer. The effluent flux was increased by 4.5 and 45 times according to 10 and 100 times increase of hydraulic permeability of vertical barrier, respectively. The seepage and flow analysis results imply that the most important factor to prevent leakage is to embed the vertical barrier in low permeable layer. The 3-dimensional stress and displacement analysis results showed small displacement but large moment and shear stress at the corner of vertical barrier. Therefore, the stiffness and strength at the corner of vertical barrier compared with other parts should be increased to secure stability of vertical barrier at offshore disposal facilities.
Kwansoo Kim,Donghwan An,Kwangseok Chae 한국농업경제학회 2007 農業經濟硏究 Vol.48 No.4
This paper tests whether exogenous shocks including agricultural policies, trade liberalization and financial crisis have impacts on the structural changes in the farm or farm household income. Unlike previous studies that specify break points prior to the estimation of regression, this paper estimates break points by fitting time series models. Tests for the structural breaks show that there is no structural break in the real farm household income whereas real farm income has five break points. Especially the break at 1997 can be interpreted as the impacts of financial crisis. The break points of 1983, 1987 and 1992 approximately match with the timings of agricultural policies that aimed better structure of agriculture and rural area were implemented. The assessed impacts of exogenous shocks at 1970, 1983, 1987 and 1992 are all positive. However, the assessed impacted of the shock at 1997 is negative. The impacts of the shock at 1997 are assessed within the range between -1,141,432 won and -3,167,804 won.
( Kwansoo Kim ),( Donghwan An ),( Kwangseok Chae ) 한국농업경제학회 2007 KOREAN JOURNAL OF AGRICULTURAL ECONOMICS(KJAT) Vol.48 No.3
This paper tests whether exogenous shocks including agricultural policies, trade liberalization and financial crisis have impacts on the structural changes in the farm or farm household income. Unlike previous studies that specify break points prior to the estimation of regression, this paper estimates break points by fitting time series models. Tests for the structural breaks show that there is no structural break in the real farm household income whereas real farm income has five break points. Especially the break at 1997 can be interpreted as the impacts of financial crisis. The break points of 1983, 1987 and 1992 approximately match with the timings of agricultural policies that aimed better structure of agriculture and rural area were implemented. The assessed impacts of exogenous shocks at 1970, 1983, 1987 and 1992 are all positive. However, the assessed impacted of the shock at 1997 is negative. The impacts of the shock at 1997 are assessed within the range between -1,141,432 won and -3,167,804 won.
( Kwansoo Kim ),( Donghwan An ),( Kwangseok Chae ) 한국농업경제학회 2007 농업경제연구 Vol.48 No.3
This paper tests whether exogenous shocks including agricultural policies, trade liberalization and financial crisis have impacts on the structural changes in the farm or farm household income. Unlike previous studies that specify break points prior to the estimation of regression, this paper estimates break points by fitting time series models. Tests for the structural breaks show that there is no structural break in the real farm household income whereas real farm income has five break points. Especially the break at 1997 can be interpreted as the impacts of financial crisis. The break points of 1983, 1987 and 1992 approximately match with the timings of agricultural policies that aimed better structure of agriculture and rural area were implemented. The assessed impacts of exogenous shocks at 1970, 1983, 1987 and 1992 are all positive. However, the assessed impacted of the shock at 1997 is negative. The impacts of the shock at 1997 are assessed within the range between -1,141,432 won and -3,167,804 won.