• Korean Journal of Hydrosciences
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• 제4권
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• pp.65-79
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• 1993

Selection of the best operating rule among a set of alternatives for a multipurpose reservoir system operation requires to evaluate many minor criteria in addition to the major objectives assessed to the system. These problems are sufficiently complex and difficult that they are beyond heuristic decision rules and experiences in case several noncommensurable multiple criteria are included in the evaluation. With the assistance of multicriterion decision analysis techniques, it is possible to select the best one among various alternatives by systematically comparing and ranking the alternatives with respect to the criteria of choice. Evaluation criteria for multipurpose reservoir system operating rules were identified and defined, and the multicriterion decision analysis techniques were applied to evaluate the four existing operating rules of the Chungju multipurpose project according to the identified nine multiple criteria. The application results show that the methodology is very efficient to select the best operation alternative among a finite number of operating rules with many evaluation criteria for a large-scale reservoir system operation.

• Water Engineering Research
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• 제5권1호
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• pp.17-36
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• 2004

This paper evaluated the water resources aspect of the operating results of the Daecheong Multipurpose Dam for the last 21 years. The elements that were evaluated included the amount of water supply from the dam. volume of outflow from the regulating dam, changes in the runoff volume at the dam site and downstream, and variations in the water supply capacity of the Daecheong Multipurpose Dam and the Geum River Barrage Dam situated in the estuary. The rainfall-runoff model was used to evaluate the changes in the runoff volume, and the water balance analysis system was used to evaluate the variations in the dams'water supply capacities. The volume of domestic and industrial water supply from the Daecheong Multipurpose Dam increased to 6.1 times for the last 21 years from 61${\times}$$10^6$$m^3$ in 1981 to 375${\times}$$10^6$$m^3$in 2001. The rate of outflow to inflow of the Daecheong Dam was analyzed 1.30 times in dry season, 1.12 times in semi-dry season, and 0.90 times in rainy season. The volume of inflow to the Geum River Barrage Dam down- stream after the dam's construction increased to 1.25 times in dry season and 1.02 times in semi-dry season and decreased to 0.94 times in rainy season. The water supply capacity of the estuary barrage dam almost did not change in cases with or without the Daecheong Multipurpose Dam, but storages were largely affected by the outflows of the Daecheong Multipurpose Dam.

• 물과 미래
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• 제25권1호
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• pp.83-92
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• 1992

다목적 저수지의 운영을 위해서 여러 가지 대안의 운영율로부터 최상의 안을 선택할 때에는 시스템에 주어진 주요 목적에 부가하여 세부적인 평가 기준들도 고려하여야 한다. 특히 평가 단위가 서로 다른 여러개의 평가기준을 고려할 때에는 경험이나 발견법 만으로는 최상의 안을 선택하기가 어렵게 된다. 다기준 의사 분석기법을 이요하면 여러대안들을 각 평가 기준에 다라 체계적으로 비교하여 대안들의 우선 순위를 결정함으로써 최상의 운영율을 선택할 수 있다. 본 연구에서는 다목적 저수지 시스템의 운영율 평가를 위한 평가 기준을 규명하여 제시하였으며, 다기준 의사분석 기법을 이용하여 충주 다목적 저수지 시스템에 대한 4개의 운영율을 9개의 평가 기준에 따라 평가하였다. 적용 결과 대규모 다목적 저수지 시스템의 운여오가 같이 많은 평가기준을 고려하여 여러 가지 대안의 운영율을 평가할 때에는 이러한 기법이 매우 효율적임을 알 수 있다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.903-908
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• 2006

Building energy simulation has become a useful tool for predicting cooling, heating and air-conditioning loads for facilities. It is important to provide building energy performances feed back to the mechanical and electrical system operator and engineer for energy conservation and maintenance of building. From this research, we set up the typical weather data of location, basic description of building, geometric modelling data and the specification of Installed primary HVAC system for establishing the simulation model about energy consuming that take place in multipurpose building complex. The simulation tool of building energy - EnergyPlus (DOE and BLAST based simulation S/W), it has been used and accomplished calculations and analyses for evaluating the effect of the system types and operating condition of central HVAC plant on the building energy consumption. In this paper, we offer comparison and simultaneous results those involve electricity consumption pattern and amount between actual operation versus EnergyPlus simulation to the object building during summer season.

• 생물환경조절학회지
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• 제13권3호
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• pp.143-148
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• 2004

시설원예 작업의 생력화을 위해 화훼온실, 육묘장, 잔디온실 및 분화재배온실에서 사용할 수 있는 다목적 자동작업장치를 개발하였다. 본 시스템의 구성은 주행부, 높이조절부, 살수부, 송풍부 및 흡입부로 되어 있다. 다목적 자동작업장치를 이용하여 다음과 같은 결과를 얻었다. 다이얼 변화에 따른 속도는 0.047～0.027 m/s로 나타났고, 에어커튼의 풍속은 고속, 중속, 저속에서 3.9 m/s, 3.6m/s, 3.4m/s로 나타났으나, 중앙 50cm의 위치에서는 0.2 m/s정도로 차이가 없었다. 관수압력이 높을수록 관수량이 많아졌으나 10kg/$\textrm{cm}^2$와 15kg/$\textrm{cm}^2$에서의 차이는 약 60ml, 15kg/$\textrm{cm}^2$와 20g/$\textrm{cm}^2$의 사이에는 약 20m1의 차이를 보였다. 흡입은 해충과 유사한 3～4 mm정도의 스티로폼 가루 및 풀 씨앗을 이용하여 측정한 결과 평균 유속은 3.64 m/s이고, 흡입유량은 0.044 ㎥/s이었다.

• 생물환경조절학회지
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• 제13권3호
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• pp.149-155
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• 2004

본 연구에서는 주행경로의 설정 및 제어가 용이한 고정 경로 방식을 이용한 주행 시스템을 개발하여 온실의 형태, 고랑의 위치 등에 무관하게 자동관수 및 송풍장치에 따른 생육상태를 실험할 수 있는 다목적 자동작업시스템을 개발하였다. 이 시스템의 성능들을 알아보기 써해 초화류에 대하여 실험한 결과 다음과 같은 결과론 얻었다. 인력두상관수 처리구에서는 전반적으로 생육의 부진을 나타냈으며, 자동관수 처리 중 송풍을 하지 않은 무풍처리구치 경우, 초장 및 엽면적이 높은 것으로 나타났다. 초장의 억제는 저속과 고속송풍처리구에 있어 초장억제 효과가 유의성이 있게 나타났으며, 풍속이 빠를수록 초장억제효과가 높게 나타났다. 줄기의 지름은 송풍을 하지 않고, 자동관수 3회를 한 경우 줄기의 지름이 작은 것으로 나타났다. 엽수는 인력관수나 자동관수 2회 처리에 비하여 3회 처리가 더 많은 것으로 나타났다. 생육은 관수회수가 많을수록 생장량이 높게 나타났다.

• 전기학회논문지
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• 제66권10호
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• pp.1532-1539
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• 2017

The floating photovoltaic system is a new concept in the renewable energy technology. That is similar to land based photovoltaic technology except floating system. So the system needs buoyant objects, mooring, ect, besides modules and supports, and that is able to withstand in water level changes and wind strength. Therefore the floating photovoltaic system is much different from land photovoltaic system. K-water (Korea Water Resources Corporation) has been operating two floating photovoltaic system that's capacity is 100 kW and 500 kW respectively since in summer 2011 for commercial generation, and have construction project for 2,000 kW in Boryeong multipurpose Dam and other areas. Furthermore K-water was developing a tracking-type floating photovoltaic system at Daecheong multipurpose Dam and developed and installed an ocean floating photovoltaic demonstration plant at Sihwa Lake in October 2013 for R&D. In this paper, we introduce that structure of floating photovoltaic system include buoyant structure, mooring system and auxiliary device. Especially the rope which is in part of mooring should be always maintain tension under any water level. Also we explain about structure design concept to wind load in an every loading condition and a kind of structure materials and PV structure types used in water environment. Especially ocean floating PV system is affected by tidal current and typhoon. So there are considering the elements in design. Finally we compare with floating and land photovoltaic on power amount. As a result of that we verified the floating photovoltaic system is more about 6.6~14.2 % efficiency than a general land photovoltaic system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 하계학술대회 논문집
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• pp.450-451
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• 2010

In this paper, the low-cost drive circuit of dc motor for a multipurpose small-size electric vehicle is developed. In order to change smoothly the rotating direction of dc motor for traction, the operating sequence of both the field current and the armature voltage according to the angle of a pedal of vehicle is suggested. The simulation study is carrier out to verify the proposed method, and the control system is implemented with 8-bit AVR.

• 대한기계학회논문집B
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• 제30권9호
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• pp.858-865
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• 2006

SMART Pilot is a multipurpose small capacity integral type reactor. Main coolant pump (MCP) of SMART Pilot is a canned-motor-type axial pump to circulate the primary coolant between nuclear fuel and steam generator in the primary system. The reactor is designed to operate under condition of $310^{\circ}C$ and 14.7MPa. Thus MCP has to be tested under same operating condition as reactor design condition to verify its performance and safety. In present wort a test apparatus to simulate real operating situations of the reactor has been designed and constructed to test MCP. And then functional tests, performance tests, and endurance tests have been carried out upon a prototype MCP. Canned motor characteristics, homologous head/torque curves, coast-down curves, NPSH curves and lift-time performance variations were obtained from the qualification test as well as hydraulic performance characteristics of MCP.

• 대한토목학회논문집
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• 제33권4호
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• pp.1389-1400
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• 2013

본 연구에서는 농업용 둑높임저수지의 다중용수공급능력(관개 및 하천유지용수) 평가에 따른 이수운영기준곡선을 개발하였다. 20개 둑높이기 사업지구를 대상으로 특성분석에 따른 4개(웅양, 궁촌, 용암, 운암)의 대표 저수지를 선정하고, 이수운영모형을 이용한 물수지분석을 통해 하천유지용수 공급 가능량을 산정하였다. 이수운영기준은 관개기와 비관개기에 대해 방류제한수위(사업전 만수위)에서 상시만수위까지의 저수위구간을 하천유지용수공급 가능 수위로 설정하고 신뢰도, 회복도 및 취약도 지수를 이용하여 각 둑높임저수지 특성별 물공급 능력을 평가하였다. 이수운영기준 적용에 따른 둑높임저수지의 이수운영기준곡선은 과거 이수운영모의결과로부터 일별 저수위를 백분위(Percentile Rank)로 표현하였다. 각 분위별 저수위 구간을 3개의 완충구간(Buffer)으로 나누어 갈수년(5~25%), 평수년(25~75%) 및 풍수년(75~95%)에 해당하는 저수지 운영이 가능하도록 하였다.