• 상하수도학회지
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• 제27권6호
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• pp.679-687
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• 2013

Although stable and safe drinking water supply to the customers is a basic function of multi-regional water supply systems in Korea, most systems have their vulnerabilities in emergency time due to the branch-type. Application of connections from the other water supply system can provide a solutions for these tentative problems. This paper describes reduction planning of water supply accidents that can minimize a service interruption to customers in multi-regional water supply system by connecting pipe lines between local water supply systems in Mokpo city areas. The result of this study shows that Juam dam multi-regional water supply systems can cover all of the water shortage in southern parts of Jeonnam multi-regional water supply systems by transmitting water through connected pipes between local networks. This can be effective to supply water interactively in various contingencies, when a pipe line accident occurs in southern area of Jeonnam multi-regional water supply systems. On the contrary, southern area of Jeonnam multi-regional water supply systems can cover 99.5 %($62,500m^3/day$) of the water shortage of Juam dam multi-regional water supply systems when service interruptions caused by various pipe accidents occur in the system.

• 상하수도학회지
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• 제33권4호
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• pp.269-279
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• 2019

This study would present a risk analysis method to evaluate stable tap water supply in a multi-regional water supply system and propose a measure for the evaluation of the effect of the conjunctive operation of the multi-regional water supply system using this. Judging from the vulnerability for the crisis response of the entire N. multi-regional water supply system, as compared to the result of Scenario 1 in which no conjunctive pipes were operated, it was found that in Scenario 2, in which conjunctive pipes were partially operated, the vulnerability of crisis response decreased by about 30.6%, and as compared to Scenario 3, the vulnerability of crisis response decreased by 86.2%. In setting a plan for stable tap water supply in N multi-regional water supply system, using the estimated value and the method for the evaluation of the vulnerability of crisis response by pipe, by interval and by line, it is judged that this can be utilized as a basis for the judgment of the evaluation of the operation or the additional installation of conjunctive pipes.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.165-170
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• 2001

An extensive range of pumping facilities are employed in the regional water supply system in metropolitan areas, and optimization and the systematic combination of the Pump facilities have direct bearing on the stability and economy of the water supply system concerned. These systems must be able to guarantee stability, efficiency and offer high reliability. Preparation of metropolitan area regional water supply system construction project must include a basic plan which takes into account the suitability of pumping facilities to be used, the environment in which facilities will be installed, man-power requirements and basic operational and management policies. This paper contains over-all analysis of the management of metropolitan area regional water supply systems as like Jayang, Paldang 1st pump station. In the study, it aims to prepare counterplan which will be operated and managed the pump upon the operational conditions and to suggest the proposal for water facilities codes to decides total head of pump in Korea.

• 한국환경과학회지
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• 제22권5호
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• pp.639-649
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• 2013

Over 96.2% of the agricultural water in Jeju Island is obtained from groundwater and there are quite distinct characteristics of agricultural water demand/supply spatially because of regional and seasonal differences in cropping system and rainfall amount. Land use for cultivating crops is expected to decrease 7.4% (4,215 ha) in 2020 compared to 2010, while market garden including various vegetable crop types having high water demand is increasing over the Island, especially western area having lower rainfall amount compared to southern area. On the other hand, land use for fruit including citrus and mandarin having low water demand is widely distributed over southern and northern part having higher rainfall amount. The agricultural water demand of $1,214{\times}10^3\;m^3/day$ in 2020 is estimated about 1.39 times compared to groundwater supply capacity of $874{\times}10^3\;m^3/day$ in 2010 with 42.4% of eastern, 103.1% of western, 61.9% of southern, and 77.0% of northern region. Moreover, net secured amount of agricultural groundwater would be expected to be much smaller due to regional disparity of water demand/supply, the lack of linkage system between the agricultural water supply facilities, and high percentage of private wells. Therefore, it is necessary to ensure the total net secured amount of agricultural groundwater to overcome the expected regional discrepancy of water demand and supply by establishing policy alternative of regional water supply plan over the Island, including linkage system between wells, water tank enlargement, private wells maintenance and public wells development, and continuous enlargement of rainwater utilization facilities.

• 한국수자원학회논문집
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• 제55권8호
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• pp.589-601
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• 2022

가뭄은 자연적 현상이지만, 지역의 물리적 및 사회적 요소와 결합되어 피해가 발생한다. 특히, 각종 용수 공급 및 수요과 연관되어 사회 경제적으로 큰 피해를 야기시킨다. 비슷한 심도의 기상학적 가뭄에도 지역의 특성과 용수공급체계에 따라 실제로 발생하는 가뭄 피해는 다르다. 본 연구에서는 지역의 사회·경제적 인자와 용수공급체계를 고려하여 가뭄 위험도를 평가하였다. 노출성은 용수공급 과부족량을 나타내는 결합가뭄관리지수(JDMI)를 등급화하여 평가하였다. 취약성은 가뭄에 영향을 받는 10개의 사회·경제적 인자에 엔트로피, PCA 및 GMM를 적용하여 가중평균하여 평가하였다. 대응능력은 지역의 용수능력을 나타내는 인자들을 베이지안 네트워크에 적용하여 평가하였다. 위험도는 노출성, 취약성 및 대응능력을 통합하여 결정하였다. 용수공급 실패 사상의 발생 가능성을 의미하는 가뭄 노출성을 평가한 결과, 괴산군이 0.81로 가장 높게 나타났다. 가뭄 취약성의 경우, 대전광역시가 0.61로 매우 취약한 것으로 나타났다. 지역의 용수공급체계가 고려된 가뭄 대응능력을 평가한 결과, 세종시가 가뭄 대응능력이 가장 낮은 것으로 나타났다. 마지막으로 위험도를 평가한 결과, 청주시가 가장 높게 나타났다. 이러한 결과를 통해 가뭄에 대한 위험 및 취약 원인을 파악하였으며, 향후 지역의 특성을 고려한 가뭄 피해 저감 정책 마련이 가능하다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1124-1125
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• 2008

본 연구는 한국수자원공사에서 국제기후변화협약 등 정부의 신재생에너지 개발계획에 적극 동참하고, 우리공사에서 운영관리하고 있는 수자원시설물의 잠재에너지를 발굴하기 위하여 경남지역본부 본포취수장에 설치하여 운영관리중인 시설용량 99kWp의 태양광발전설비에 대한 주요 설비와 운영관리를 하는데 불편한 사항에 대한 개선내용을 소개함으로써 향후 우리시스템과 유사한 조건(무인사업장)에 시설하여 운영할 설비를 효과적으로 관리하기 위한 내용을 소개하고 있다.

• 상하수도학회지
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• 제13권1호
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• pp.95-112
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• 1999

In this research, it is proposed that optimization method is introduced and applied to the design of pipeline system in multi-regional water supply project, which has been constructed to settle the regional unbalance problems of available water resources. For the purpose, interface programs are developed to integrate linear programming model and KYPIPE model which is used for optimization and hydraulic analysis, respectively. The developed program is applied to the pipeline system design of multi-regional water supply project. The optimal diameters from the application of linear programming technique are compared with those from conventional method that is time-consuming and tedious trail and error process. Since the conventional design largely depends upon the experience of designers and the results of general hydraulic analysis, it can not be reasonable and consistent. The application of linear programming technique can make it possible to design pipeline system optimally by using same design factors of general hydraulic models. The model can select commercial discrete pipe diameter as optimal size by using pipe length as decision variables. The developed model is applied to Pohang multi-regional water supply system design with two different objective functions, which are initial construction cost and annual cost including electric cost. As results, it is calculated that the initial construction cost of 1,449,740 thousand won is saved and annual cost of 128,951 thousand won is saved for a year within study year. Also, the optimal site of pump station is selected on 5th pipe, which is located between the diverging junction to Kangdong(2) province and the diverging junction to Cheonbuk province. It is explained that pump cost is less than pipe cost in this application case study due to little pump station scale. In the case of water supply with large pump capacity, it is reasonal that the increase of pipe size is more efficient instead the increase of pump station capacity to save annual cost.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.159-164
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• 2001

An extensive range of pumping facilities are employed in the regional water supply system in metropolitan areas, and optimization and the systematic combination of the pump facilities have direct bearing on the stability and economy of the water supply system concerned. These systems must be able to guarantee stability, efficiency and offer high reliability. Preparation of metropolitan area regional water supply system construction project must include a basic plan which takes into account the suitability of pumping facilities to be used, the environment in which facilities will be installed, man-power requirements and basic operational and management policies. This paper contains over-all analysis of the management of metropolitan area regional water supply systems and highlights the cause of Inefficiency and energy waste and puts forward a remedial plan of action. In addition, pump/motor specification programs were developed using Visual Basic to assist selection of the same.

• 한국수자원학회논문집
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• 제32권5호
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• pp.537-545
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• 1999

본 연구에서는 다음과 같은 세 가지 측면에서 광역상수도 요금제도 개선 방향을 분석하였다. 첫째, 지금까지 기존 연구에서는 거의 논의가 없었던 용도별(생활용수, 공업용수) 차등요금을 부과하는 방안을 분석하였다. 먼저 현행 용도별 동일 요금체계의 문제점을 지적하고 용도별 차등화 요금 설정을 위한 몇 가지 방법론을 제시하였으며, 다소 제약적인 가정에서지만 실증자료를 이용하여 람지(Ramsey) 가격을 계산해 보았다. 둘째, 첨두부하요금(계절별 차등 요금)과 관련하여 일반론적인 측면에서의 첨두부하 요금 적용의 근거 외에 광역상수도 공급 시스템이 특수하게 가지고 있는 댐 설비와의 관련성을 고려한 계절별 차등요금의 근거도 있음을 지적하고 이러한 두 측면을 모두 종합적으로 고려해야 함을 지적하였다. 셋째, 현재 계획 부하에 대한 책임소재를 불분명하게 만드는 배분량, 급수 결정량 제도의 문제점을 자세히 지적하고 지방자치단체에게 광역상수도 건설 수요(계획 부하)에 대한 책임을 부과하고 지방자치단체간 비용부담의 형평성을 유지하게 해주는 '책임수량제(責任水量制)'의 광역상수도 적용필요성을 제시하였다.

• 상하수도학회지
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• 제31권6호
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• pp.511-519
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• 2017

Multi-regional water supply system, which installed for supplying multiple water demands, is characterized by large-sized, long-distance, tree-type layout. This system is vulnerable to long-standing service interruption when a pipe breaks is occurred. In this study, a numerical method is proposed to calculate drainage time that directly affects time of service interruption. To begin with, governing equations are formulated to embed the delayed drainage effect by the friction loss, and to resolve complicated connection of pipelines, which are derived from the continuity and energy equations. The nonlinear hydraulic equations are solved by using explicit time integration method and the Newton-Raphson method. The developed model is verified by comparing the result with analytical solution. Furthermore, the model's applicability is validated by the examples of pipelines in serial, in parallel, and complex layout. Finally, the model is utilized to suggest an appropriate actions to reduce the deviation of draining time in the C transmission line of the B multi-regional water supply system.