• Architectural research
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• 제9권2호
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• pp.27-35
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• 2007

Our nation has a problem with discrimination of income distribution and inefficient of resources distribution caused by real estate price rising from a sudden economy growth and industrialization. Specially, in recent years, there is a great disparity of apartment price between the north and south of the Han river. Because the housing price is decided by the immanent value of a house and neighborhood effects of the regional where the house is situated, the housing price is occurred difference. The purpose of study was to analyze the influence of various factors of housing price. Also, this study tried to predict real estate market and to establish previous effective real estate policy. In this study, we analyzed the differences of housing price determinants about apartment developments between the north and south of the Han river, and found the important factors that affect the housing price using Structural Equation Modeling(SEM). As a result of this study, the older the buildings are, the more the housing price and the housing price rising ratio have increased, in Gang Nam area. This reason is that these have large possibility to be reconstructed and many convenient facilities, in this area. In the case of Kang Buk area, the increase rate of housing price are so low that they couldn't take effect on the housing price and they were declined. So to speak, constructing the infrastructure which takes effect on the increase rate of housing price is very urgent.

• 대한토목학회논문집
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• 제38권2호
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• pp.237-247
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• 2018

유역 특성은 유역과 하도망의 지형학적인 구성에 대한 특성을 반영하는 것으로 유출 특성에 영향을 준다. 본 연구에서는 유역의 형태학적 특성과 유출의 관계를 분석하기 위해 한강 유역의 19개 하천의 27개 지점을 대상으로 유역 형태학적 특성을 Arc-map을 이용하여 구하였다. 하천 형태학적 특성은 선형, 면적, 기복 측면으로 구분하여 산정하였고, 강우에 의한 유역의 반응인 연평균 유출률은 실측 강수량과 유출량 자료를 이용하여 산정하였다. 각각의 형태학적 매개변수에 대한 상관을 도식화하고, 상관특성을 분석하였다. 길이비, 형상계수, 형상인자, 면적비, 기복비, 함몰도에 의한 연간 유출률에 대한 다중 회귀분석식을 제시하였고, 결정계수는 0.691로 나타났다. 실측과 회귀분석식에 의해 계산된 연간 유출률과의 RMSE와 MAPE는 각각 0.09, 11.61%로 나타나 비교적 정확히 예측하였다.

• 한국환경과학회지
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• 제27권12호
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• pp.1179-1193
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• 2018

The purpose of this study at water quality pollutants to propose proper management method for the Osu-A unit watershed which is the influent tributary located upstream of the Sumjin -river among the 13 unit watersheds in the Sumjin-river water system. Analyzed the correlation between flow-pollution loading and the correlation between land use type, BOD and TP items, and analyzed 8-day intervals Cumulative Flow Duration Curve (CFDC) and Load Duration Curve (LDC) to evaluate water quality damage. As a result, both BOD and TP were larger than 1 and the concentration of water pollutants increased with increasing flow. BOD was positively correlated with Urban and Field, and TP was positively correlated with Field with 0.710. As a result of the LDC, BOD was analyzed that the target water quality was achieved with the excess rate of less than 50%, and TP exceeded the target water quality by 50.1%. BOD usually exceeded the standard value (exceedance probability 50%) at low flow zone and On the other hand, TP usually exceeded the standard value at high flow zone. Monthly BOD (April to June) and TP (May to August) exceeded the standard. Sewage Wastewater treatment and non-point pollution control is Osu-A unit watersheds are effective in improving BOD and TP.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.366-375
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• 2007

Our nation has a problem with discrimination of income distribution and inefficient of resources distribution caused by real estate price rising from a sudden economy growth and industrialization. Specially, in recent years, there is a great disparity of condominium price between the north and south of the Han river. Because the housing price is deciede by the immanent value of a house and neighborhood effects of the regional where the house is situated, the housing price is occurred difference. In this study, I analyzed the differences of housing price determinants about condominium developments in the old and new residential areas, and found the important factors that affect the condominium price using Structural Equation Modeling(SEM) The purpose of study is to analyze the influence of various factors of housing price. Also, this study tried to predict real estate market and to establish previous effective real estate policy.

• 환경영향평가
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• 제27권4호
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• pp.353-366
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• 2018

본 연구의 목적은 임진강 수질오염총량관리제도를 위한 단위유역의 2012년 1월부터 2016년 12월까지 유량과 수질자료를 통계분석기법에 이용하여 수질특성을 평가하는 것이다. 유량과 수질은 평균 8일 간격으로 측정하였으며 11개 항목을 상관분석, 주성분 분석, 요인분석, 군집분석에 사용하였다. 군집분석의 결과 공간변화에 따라 자연형 하천, 도시형 하천, 점오염원 영향이 큰 지점 등으로 3개의 그룹으로 분류되었으며, 오염원의 종류와 수질 유사성이 군집 분류에 영향을 미치는 것으로 나타났다. 일원 분산분석과 사후검정을 이용하여 군집간의 평균사이에는 통계적으로 유의한 수준의 차이가 있는 것으로 나타났다. 상관분석에서 $COD_{Mn}$와 TOC의 상관계수가 0.951(p<0.01)로 상관성이 통계적으로 유의하게 높게 나타났다. 주성분 분석 결과 3개의 주성분으로 전체 수질특성의 72%를 설명할 수 있으며 요인분석에서 주요 요인은 EC, $BOD_5$, $COD_{Mn}$, TN, TP, TOC 항목으로 나타나 유기물과 영양염류 간접지표가 수질에 영향을 미치는 것으로 나타났다. 본 연구에서 요인점수를 다중 선형회귀분석에 적용하여 회귀 방정식을 제시하고 임진강 유역 수질관리에 유기물 및 영양염류 간접지표 항목의 관리가 중요하다고 판단된다.

• 환경영향평가
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• 제7권1호
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• pp.81-91
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• 1998

The objective of this study was to use remotely sensed data, combined with in situ data, for the assessment of trophic state for Daecheong reservoir. Three Landsat TM(Thematic Mapper) imagery data were processed to portray trophic state conditions. The remotely sensed data and the measured data were obtained on 20 June 1995. Regression models have been developed between the chlorophyll-a concentration and reflectance which was converted to Landsat TM digital data. The regression model was determined based on the correlation coefficient which was higher than 0.7 and was applied to the entire study area to generate a distribution map of chlorophyll-a and trophic state. The equation, providing estimates of chlorophyll-a concentration, represented the year-to-year spatial variation of trophic zones in the reservoir. Satellite remote sensing data derived from Landsat TM had been successfully used for trophic slate mapping in Daecheong reservoir.

• 산업기술연구
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• 제32권A호
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• pp.47-55
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• 2012

Currently, we only estimate the average flood water level by the cross-sections of the river using one-dimensional numerical analysis when establishing the basic plans. However, the reliability decreases when it comes to the river bend. In river bend, the difference of water-level between the inside and the outside of the river arises by centrifugal force. And it is estimated less than what it could be estimated when establishing the plan with average estimate of flood level. It is apprehended that the exterior of the river will be under-constructed when establishing the scour depth only with the mean depth. In the case of local scour of the abutment, it is difficult to estimate its depth precisely, and it tends to be over-estimated in the case of the empirical formulas. Therefore, the modification considering the deviation of the water depth of the exterior of the river bend is needed. In observing the deviation of each formula in river bend, it is found: Andru's formula for 58%, followed by the Laursen's for 26%, and the C.S.U's for 17% in pier, while it is 44% for Froehlich's formula in abutment. Under the 500CMS of the flood discharge, the deviation of the scour depth between pier and abutment was about 10 %. However, in further flood discharge, it shows 24~58% the biggest in deviation of piers. It is concluded that the scour depth estimate should be done with 2-dimensional numerical analysis.

• 대한토목학회논문집
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• 제14권4호
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• pp.847-857
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• 1994

본 연구에서는 미국 교통성에서 개발된 2차원 수리계산모형인 FESWMS-2DH를 갈수기 감조구간인 잠실수중보와 신곡수중보 구간에 적용하여 모형의 적용성을 검토하고 수위관측자료와 유량자료를 이용하여 유속과 수위를 계산하였다. 이 모형은 Galerkin 유한요소법을 이용하여 부정류 해석을 할 수 있으며 삼각형 요소와 사각형 요소를 혼합하여 요소망을 구성할 수 있다. 모형의 적용결과 유속분포 및 수면형과 질량 유출입 보존 등의 면에서 정밀성과 안정성이 우수하게 나타났으며 연구결과는 수질관리 및 새로운 인공구조물 설치를 위한 가본자료로 사용될 수 있을 것이다.

• 물과 미래
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• 제28권2호
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• pp.103-114
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• 1995

하천 수질변동의 예측을 위한 추계학적 모형 STO-RIV를 개발하였다. STO-RIV는 Streeter-Phelps 확장식의 해석적인 해와 Monte-Carlo 기법으로 구성하였다. 본 모형은 왜관에서 물금에 이르는 낙동강 유역에 적용하여 장래의 물금지점에서의 하천수질의 확률론적 특성이 정량적으로 계산될 수 있었다. 또한 금호강의 처리도 등을 고려한 여러 가지의 수질관리 대안에 대한 수질변동 특성의 해석이 수행되었다. 본 STO-RIV모형은 수질관련변수들의 변동성이 크게 나타나고 있는 국내하천 수질관리에 크게 활용될 수 있을 것으로 기대된다.

• 한국농공학회지
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• 제29권4호
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• pp.59-72
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• 1987

Although long-term runoff analysis is important as much as flood analysis in the design of water works, the technological level of the former is relatively lower than that of the latter. In this respect, the precise estimation model for the volume of successive runoff should he developed as soon as possible. Up to now, in Korea, Gajiyama's formula has been widely used in long-term runoff analysis, which has many problems in applying in real situation. On the other hand, in flood analysis, unit hydrograph method has been exclusively used. Therefore, this study aims at trying to apply unit hydrograph method in long-term runoff analysis for the betterment of its estimation. Four test catchment areas were selected ; Maesan area in Namlum river as a representative area of Han river system, Cheongju area in Musim river as one of Geum river system, Hwasun area in Hwasun river as one of Yongsan river system, and Supyung area in Geum river as one of Nakdong river system. In the analysis of unit hydrograph, seperation of effective rainfall was carried out firstly. Considering that effective rainfall and moisture condition of catchrnent area are inside and outside of a phenomenon respectively and the latter is not considered in the analysis, Initial base flow(qb)was selected as an index of moisture condition. At the same time, basic equation(Eq.7) was established, in which qb can take a role as a parameter in relating between cumulative rainfall(P) and cumulative loss of rainfall(Ld). Based on the above equation, computer program for estimation model of qbwas seperately developed according to the range of qb, Developed model was applied to measured hydrographs and hyetographs for total 10 years in 4 test areas and effective rainfall was estimated. Estimation precision of model was checked as shown in Tab- 6 and Fig.8. In the next stage, based on the estimated effective rainfall(R) and runoff(Qd), a runoff distribution ratio was calculated for each teat area using by computerised least square method and used in making unit hydrographs in each test area. Significance of induced hydrographs was tested by checking the relative errors between estimated and measured runoff volume(Tab-9, 10). According to the results, runoff estimation error by unit hydrograph itself was merely 2 or 3 %, but other 2 or 3 % of error proved to be transferred error in the seperation of effective rainfall. In this study, special attentioning point is that, in spite of different river systems and forest conditions of test areas, standardized unit hydrographs for them have very similar curve shape, which can be explained by having similar catchinent characteristics such as stream length, catchinent area, slope, and vegetation intensity. That fact should be treated as important factor ingeneralization of unit hydrograph method.