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지방상수도 서비스의 생산비용 및 요금에 관한 영향요인 연구
정성영 ( Seong Young Jeong ),조세현 ( Sae Hyen Cho ),현대용 ( Dae Yong Hyun ),배수호 ( Su Ho Bae ) 한국지방행정연구원 2012 地方行政硏究 Vol.26 No.3
The purpose of this paper is to examine factors affecting local water supply costs and water prices in Korea. Our major concerns are in the following: (1) supply-side factors, (2) demand-side factors, and (3) institutional and financial factors. We utilize a seemingly unrelated regression (SUR) estimation method to take into account the correlations between the residuals in the both equations for our dependent variables, i.e., water supply costs and water prices. In doing that, it utilizes panel data (2000 to 2009) from 156 local water suppliers in Korea. According to empirical findings, institutional and financial factors, along with supply-side and demand-side factors, significantly affect local water supply costs and water prices. In details, water supply capacity and population density have negative effects on water supply costs, while water supply rates, water leakage rates, single household rates, multiple household rates, and water supply-related debts have positive effects. Water supply capacity, population density, and local financial autonomy make contributions to a decrease in water prices, while pipe length, a local government categorized as a city rather than a county, and water supply-related debts contribute to an increase in water prices. These findings suggest that we need to consider not only supply-side and demand-side factors but also institutional and financial factors in order to reduce water supply costs and prices.
김정석(Kim Jung Seok),정종철(Jeong Jong Cheol),한정우(Han Jeong Woo),한성호(Han Seong Ho),조세현(Cho Sae Hyun),서승일(Seo Sung Il) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper explains the fatigue test for a composite train carbody. The composite carbody with length of 23m was manufactured as a sandwich structure composed of a aluminium honeycomb core and woven fabric carbon/epoxy face. In order to evaluate fatigue strength of the composite carbody, the carbody was excited by two 50-ton capacity hydraulic actuators. The excitation frequency was determined by natural frequency evaluation test under full weight condition. The test was conducted for 2x106cycles. During the fatigue test, fatigue cracks of the composite carbody and steel underframe were inspected by the nondestructive tests using X-ray and liquid penetrant. From test tests, no fatigue crack was detected.
李南宰,曺世鉉 최신의학사 1968 最新醫學 Vol.11 No.10
This paper reports two cases of fecalith-induced small bowel obstruction in &year.old boy and 43-year; old. woman. It is desirable to consider the possibility of diospyrobezoar in the etiologic diagnosis of the intestinal obstruction and of vague gastrointestinal complaints.. to find out the cause of them.