• 설비공학논문집
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• 제14권5호
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• pp.377-384
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• 2002

For economic evaluation of cooling plant equipments, it is necessary to simplify energy Prediction method, which should includes efficiency corrected by part-load ratio. This study proposed simplified method with regression equations of time-average partial loads and refrigerator capacity. DOE-2 Program was used to carry out a parametric study of twelve design variables. Five input variables were considered to be significant and were used in the regression equations. To test accuracy of simplified method, calculated results were compared with DOE-2 simulated results. Test result showes a good agreement with the simulation result with an error of 5.9∼7.6%. It is expected that this method can be used as an easy prediction tool for comparing energy use of different cooling plants during the early design stage.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.535-539
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• 1995

In recent years, electric industries in many countries confront with a structural change in business and socio-economic environments. Since 1984, PUC and utilities in U.S.A. have adopted or developing competitive bidding systems, and this new procurement programs prevailing and restructuring the power markets. In Korea, government and the Korea Electric Power Corporation (KEPCO) invited the private sector to build and operate two 500 MW coal plants and two 400 MW LNG plants during 2001 - 2004. The plan also specifies basic concepts and conditions for the IPP projects such that new IPPs are selected through competitive bidding system with the purchased power price based on the avoided cost. In this study, the direction, guideline and scoring methods to Korean IPP bidding system are presented. Also, as a benchmark price and rates for purchased power, the avoided cost calculation models are developed, this study may contribute for the development of private power in Korea, and improve overall economic efficiencies of whole electric power sector.

• 기술사
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• 제30권5호
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• pp.82-95
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• 1997

A Study of Improvement in Reactor Thermal Power Measurement Method using Kalman Filter. The objectives of the safety analysis of nuclear power plants are to maintain the surface temperature of fuel and fuel cladding within limit value in case of Loss of Coolant accident (LOCA) so that it ensures the safety and reliability of nuclear power plants. The new technique evaluating the reactor power and improvement of existing plant system increase the safety margin of nuclear power plant operation, and accordingly, economic effect will be anticipated. Hereby, 1 would like to introduce reactor power measurement method using Kalman filter that enables to calculate the reactor power more precisely combining the parameters, for example, turbine output as the 1 st stage pressure of high pressure turbine, and reactor power using energy equilibrium relation. It is expected that the new technique will enhance the accuracy of measurement of reactor power and maintain the reliability of nuclear power operation by increasing operational safety margin, and gain the economic benefit

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2000년도 추계 학술발표회
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• pp.15.3-15
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• 2000

• 수산경영론집
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• 제44권2호
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• pp.69-81
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• 2013

The purpose of this study is to examine the economic validity of Ecklonia cava aquaculture business for raising fishing people's revenue. The results of this study are summarized as follows: First, the production of Ecklonia cava is estimated about 251 ton or more in Jeju. Second, the distribution structure of Ecklonia cava is not established, but Ecklonia cava is traded much more through bio or processing corporation than through fisheries cooperative like other marine plants. Third, the price of Ecklonia cava should be at least 1,729 won per kilogram under 4.04% of capital cost for economic feasibility of Ecklonia cava aquaculture business. Finally, the results of sensitivity analysis show that there is economic feasibility of Ecklonia cava aquaculture business when the price of Ecklonia cava is more 2,500 won per kilogram and the capital cost is under 8.0%.

• 한국산업융합학회 논문집
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• 제27권2_1호
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• pp.277-285
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• 2024

Hydrogen is considered a key energy source to achieve carbon neutrality through the global goal of 'net zero'. Due to limitations in producing green hydrogen domestically, Korean companies are interested in importing green hydrogen produced overseas. The Middle East has high-quality solar energy resources and is attracting attention as a region producing green hydrogen using renewable energy. To build a green ammonia plant, optimization of the production facility configuration and economic feasibility analysis are required. It is expected that it will contribute to reviewing the economic feasibility of constructing overseas hydrogen production plants through preliminary economic feasibility analysis.

• 열병합발전
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• 통권27호
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• pp.5-9
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• 2002

High pressure steam pipe in power plants is subjected to service conditions under which creep processes take place limiting the component's lifetime. To ensure a safe and economic operation it is necessary to get accurate information about the lifetime situation of single components as well as of the whole system. Careful evaluation is combined with FEM analysis, NDT, microstructure evaluation. Especially, 14MoV63 steel is used as material for main steam pipe for 30 years old power plants. In service inspections have shown an increasing number of cracks and creep cavities beside stress concentration parts. A detailed analysis came to the conclusion that lifetime has been consumed to a high degree, 80%level.

• 산업경영시스템학회지
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• 제23권54호
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• pp.167-177
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• 2000

The problem of system reliability is very important issue in the nuclear power plant, because the failure of its system brings about extravagant economic loss, environment destruction, and quality loss. This paper therefore proposes a normalized scoring model by the qualitative factors order to evaluate the robust reliability of nuclear power plants under uncertainty. Especially, the qualitative factors including risk, functional, human error, and quality function factors for the robust justification has been also introduced. Finally, the analytical reliability and safety assessment model developed in this paper can be used in the real nuclear power plant.

• 농약과학회지
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• 제14권3호
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• pp.241-246
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• 2010

찰옥수수를 가해하는 조명나방의 피해에 대한 요방제 수준을 설정하고자 페로몬 트랩을 이용한 성충의 유살량 조사와 처리구별로 피해율을 조절하여 포장시험을 수행하였다. 춘천 등 도내 5개 지역에 설치한 페로몬 트랩에 조명나방 성충이 찰옥수수 전 생육기간에 걸쳐 유인되었으며, 유살량은 춘천, 철원, 홍천 순으로 많았고, 이에 따른 찰옥수수의 피해율도 같은 경향을 나타냈다. 찰옥수수 출사기에 조명나방의 피해주율을 조절하여 수확기에 처리별로 수량을 조사한 결과, 출사기 피해주율이 11~15%일 때부터 찰옥수수상품수량이 급격히 감소하여 경제적 피해 허용수준을 초과하였으며 따라서 이 수준을 요방제 수준으로 설정하였다.

• 한국경제지리학회지
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• 제15권3호
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• pp.437-455
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• 2012

전 세계적으로 환경문제가 큰 이슈가 됨에 따라, 우리나라에서도 신재생에너지에 대한 관심의 일환으로 전라도를 중심으로 많은 태양광발전소가 건설되었다. 그러나 입지 선정 과정에서 환경 사회적 영향을 충분히 고려하지 않아 각종 문제점들이 야기되었으며, 기존 시설의 입지 타당성 평가와 지속가능한 입지 모색이 요구되었다. 현재까지 환경을 고려한 태양광발전소의 입지 선정 연구는 미미하며, 기존 시설을 평가한 연구도 진행된 바 없다. 따라서 본 연구에서는 전라도에서 환경 사회적 영향을 최소화하는 지속가능한 입지를 제안하고, 현존하는 시설의 입지 타당성을 평가하였다. 이를 위해 연구방법으로 크리깅(Kriging)과 네트워크분석법(Analytic Network Process; ANP)를 이용하였다. 네트워크분석법을 통해 도출된 가중치로 모든 공간데이터를 통합하여 최적의 입지를 도출하고, 환경 사회적으로 영향을 줄 수 있는 구역을 최적지에서 제외하였다. 그 결과, 전반적으로 서해안과 남해안 부근에 적합지가 많은 것으로 나타났다. 또한, 환경 사회적 영향을 고려한 최종 입지 적합도와 기존 시설의 위치를 비교 분석한 결과 총 81곳 중 23곳이 부적합한 태양광발전소로 판단되었다. 본 연구의 결과를 통해 사회적 갈등 및 환경문제를 방지하는 지속가능한 입지 선정이 가능할 것이며, 기존 입지를 객관적으로 파악하는 지표를 제공함으로써 대책 마련에 도움을 줄 것으로 기대된다.