• Ocean and Polar Research
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• 제36권2호
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• pp.157-163
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• 2014

This study analysed the economic feasibility per hectare of grow out phase production of Oyster farming by rising water temperature in Ocean. Elevated Water temperature by climate change had a bad influence for oyster production and economic feasibility. In the case of production units, the total output of oyster decreases from 213,840 to 205,594 units. Using cost-benefit analysis with discounting rates (5.5%), we estimated the net present value (NPV) and benefit cost ratio (BCR) until 2100 years. The model results showed that the NPV without water temperature rise was 1,565,619,893 won and the NPV with water temperature rise was 1,540,493,059 won. Also, BCR estimated that the former was 2.095 better than the latter was 2.077. To summarise, the economic effect per hectare of water temperature rise in ocean did the damage to the economic loss about 25,126,834 won.

• 환경영향평가
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• 제20권4호
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• pp.565-574
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• 2011

This paper aims to design a policy-assessment tool liking the Environmental Impact Assessment(EIA) and the Cost Benefit Analysis (CBA). As a step towards the incorporation of environmental and economic considerations, the approach used herein takes the form of integrating quantitative information on environmental benefits and costs associated with implementing the project into the existing framework of the EIA. Our case study is an project appraisal of a solar energy plant. It is confirmed that the technique is operational, however, there are certain limitations for a complete assessment. The difficulty mainly originated from the omission of important information from each step of the valuation process. Alternatively stated, some environmental services are not identified, nor quantified, and nor monetized in the process. More case studies are warranted in the future along with elaboration in methodology of techniques. In addition, the construction of a database on environmental values will be required to accumulate reliable and systematized data. These are the necessary conditions to improving quality in application of techniques as well as providing comprehensive and balanced information to decision makers.

• Journal of Electrical Engineering and Technology
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• 제13권2호
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• pp.659-668
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• 2018

This paper proposes an optimization approach of a grid-connected photovoltaic and wind hybrid energy system including energy storage considering voltage fluctuation in the electricity grid. A techno-economic analysis is carried out in order to minimize the size of hybrid system by considering the benefit-cost. Lithium-ion battery type is used for both managing the electricity selling to the grid and reducing voltage fluctuation. A new technique is developed to limit the voltage perturbation caused by the solar irradiance and the wind speed through determining the state-of-charge of battery for every hour of a day. Improved particle swarm optimization (PSO) methods, referred to as FC-VACPSO which combines Fast Convergence Particle Swarm Optimization (FCPSO) method and Variable Acceleration Coefficient Based Particle Swarm Optimization (VACPSO) method are used to solve the optimization problem. A comparative study has been performed between standard PSO method and PSO based methods to extract the best size with the benefit cost. A sensitivity analysis has been studied for different kinds and costs of batteries, by considering variable and constant state-ofcharge of battery. The simulations, performed under Matlab environment, yield good results using the FC-VACPSO method regarding the convergence and the benefit cost of the hybrid system.

• 한국건축시공학회지
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• 제13권4호
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• pp.416-423
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• 2013

An adjusted assessment model based on benefit-cost analysis (BCA) is proposed for evaluating the economic efficiency of automated construction technologies. In contrast to conventional BCA, the model does not compare monetary values, but the differences in benefits and costs between traditional and automated construction methods. To verify the usefulness of the model, it was applied to a real-scale building construction project that used a fully automated building construction system, and the face validity of the model was confirmed. The results indicate that the model can support decision makers in identifying valuable benefit factors and in assessing the cost effectiveness of the system.

• Current Research on Agriculture and Life Sciences
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• 제32권3호
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• pp.165-169
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• 2014

계란 세척기 평가 금액 추정 결과는 다음과 같다. 계란 세척기 총수입(인건비 절감으로부터의 조수입 증대)에서 산정하였으며, 계란 세척기 총비용은 구입가격, 고정비용 및 유동비용의 합계로 나타내었다. 계란 세척기 평가액은 할인율 수준에 따라 최소 44,778천원(할인율 10%)에서 최대 45,778천원(할인율 5%), 평균 45,278천원으로 추정된다(Table 7). 계란세척기의 경제적 타당성을 살펴보면, 내부수익율 IRR의 값은 가정했던 할인율(5%~10%)보다 훨씬 높고, 순현재가치(NPV)는 0보다 훨씬 크며, B/C 비율도 1.0 이상으로 나타나 계란 세척기 개발사업의 경제적 타당성은 있는 것으로 판단된다(Table 8).

• 사회복지연구
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• 제41권3호
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• pp.299-326
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• 2010

본 연구는 우리나라의 전체 자활사업에 대한 비용-편익 분석을 목적으로 한다. 자활사업을 통해 투입된 비용과 자활사업을 통해 산출된 편익의 규모를 파악하고, 이를 비교 평가함으로써 자활사업의 효율성에 대해 분석해 보고자 한다. 첫째, 회계적 관점에서 (기초수급자들이 자활사업 참여 전에 근로하지 않고 기초급여에 의존하였다는 가정에 기반하여) 비용-편익 분석한 결과, 전체 자활사업의 경우 참여자 입장과 사회전체적 입장에서 순편익이 발생하는 것으로 나타났다. 둘째, 대안적 관점에서 비용-편익 분석을 실시한 결과 탈수급율과 취업률의 향상이 있을 경우 편익이 급속하게 증가하는 것으로 나타났다. 본 연구는 우리나라 전체 자활사업의 비용과 편익을 분석한 최초의 연구로서의 의의를 가진다.

• 한국철도학회논문집
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• 제13권3호
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• pp.333-338
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• 2010

철도투자사업의 경제성 증대를 위해서는 새로운 편익의 발굴도 중요하지만 비용 부문에서 과다하게 책정되는 부분을 개선하는 것도 매우 중요하다. 본 논문은 철도부문의 편익을 제고하기 위해 철도차량의 정차 패턴까지 고려한 최적화 모형을 이용하여 분석할 것을 제안한다. 기존의 방법은 주요 역에 모두 정차한다는 시나리오를 토대로 운행시간을 작성하였으나 이는 실제 운행 여건과는 맞지 않는다. 열차별 정차 패턴을 고려하여 소요 차량수를 산정할 경우 계획 단계에서 적용되는 차량구입비를 합리적으로 산정할 수 있고 경제성 분석에도 긍정적인 영향을 주는 것으로 분석되었다.

• Journal of Electrical Engineering and Technology
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• 제9권4호
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• pp.1240-1247
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• 2014

The applications of Distributed Generation (DG) in a smart distribution grid environment are widely employed especially for power balancing and supporting demand responses. Using these applications can have both positive and negative impacts on the distribution system. The sizing and location of their installations are the issues that should be taken into consideration to gain the maximum benefit from them when considering the economic aspects. This paper presents an application of the Bat Algorithm (BA) for the optimal sizing and siting of DG in a smart distribution power system in order to maximize the Benefit to Cost Ratio (BCR), subjected to system constraints including real and reactive power generation, line and transformer loading, voltage profile, energy losses, fault level as well as DG operating limits. To demonstrate the effectiveness of the proposed methodology and the impact of considering economic issues on DG placement, a simplify 9-bus radial distribution system of the Provincial Electricity Authority of Thailand (PEA) is selected for the computer simulation to explore the benefit of the optimal DG placement and the performance of the proposed approach.

• 아태비즈니스연구
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• 제13권2호
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• pp.139-154
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• 2022

Purpose - This study aims to analyzing of solar power generation cost-benefit. Design/methodology/approach - We analyzed whether there is economic feasibility by selecting parking lots and idle sites located in four areas of Seoul, Gyeonggi, Chungcheong, Jeolla, and Gyeongsang areas nationwide, and analyzing site conditions and installation capacity. Findings - According to the results of the analysis, it was found that there is low profitability in Seoul, Gyeonggi and Chungcheong regions, where the solar radiation was not excellent even if REC is selected through the contract market. However, it is necessary to analyzed the economical validity the profitable validity including environmental benefits (greenhouse gas reduction, NOx, SOx reduction effect) and social benefits (renewable power supply) that is analyzed by income and operating costs which is occurred from electricity sales and REC sales when installing solar power generation facilities. Research implications or Originality - In this study, economic feasibility was evaluated additionally in consideration of environmental and social benefits. In conclusion, it was shown that businesses are not economical when considering only simple financial aspects are also sufficiently economical when it is considering environmental and social benefits.

• 한국산학기술학회논문지
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• 제21권5호
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• pp.274-280
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• 2020

이 연구의 목적은 건강보험심사평가원에서 공개한 2015년 4월부터 2018년 4월까지 상급종합병원의 비급여 진료비 자료를 사용하여 비급여 진료비 항목별로 현황 및 평균 비용과 변이가 있는지 파악하는 것이다. 조사대상은 2015년, 2016년, 2017년, 2018년 4월 기준 상급종합병원 44개 기관 중 취소되거나 신규로 지정된 기관은 제외하고 최종 41개 상급종합병원의 비급여 진료비 현황이다. 연구방법은 건강보험심사평가원 정보공개창구에서 공개 자료를 요청한 후 승인을 받아 진행하였다. 분석방법은 일반적 특성과 연도별 비급여 항목 현황은 빈도분석, 연도별 변이 파악은 변동계수(C.V.)를 선정하여 분석하였다. 연구 결과, 비급여 진료비 세부항목의 현황을 비교 분석한 결과 비급여 항목의 개수가 2015년에는 총 51개였지만, 2016년 53개, 2017년, 98개로 점점 증가 추세를 보였으며 2018년에는 총 193개 항목으로 급격히 증가하였다. 상급종합병원 비급여 진료비 변이에 따른 항목 표준화를 위해서 정부는 비급여 진료비 표준화를 확대하고 의료기관은 표준화된 비급여 진료비 항목이나 명칭 등을 사용하도록 의무화하여야 한다.