• 한국건축시공학회지
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• 제2권4호
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• pp.123-129
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• 2002

This research is aiming to specify the requirement of the investment such as initial cost, running cost earning rate to make effective investment considering the purpose of remodeling and economical value of store building enough to meet the initial purpose of remodeling. The review of earning rate for economical evaluation was performed by the on-site auditing on the structure and function of the building and applying the assessment simulation program, which is to find the possible business model to identify the requirement of building owner through case study. After the research, the following results are obtained. First, it is important that many aspects should be carefully analysis and the best method should be selected as characteristics of remodeling can tie defer each other in their implementations. Second, though the remodeling of exist buildings to promote the functions has been applied. no suitable assessment tool has bee developed for deriding the level of remodeling in the view of economical efficiency so far. Third, the economical benefit was evaluated by analysing annual earning rate which is applied by investment items and recovery period for the investment. More specific data base should be established to apply the suggested economic accession in business enough to forecast the future circumstances. More researches should be promoted on this area continuously as well as the integrated economic evaluation of remodeling on existing building.

• 유통과학연구
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• 제15권11호
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• pp.59-72
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• 2017

Purpose - This paper evaluated the efficiency performance of the three major maritime transport markets and examined the determinants of the performance. The firms' revenue fluctuates with the changes of the economic cycle; hence it is important for them to set up business strategies to improve efficiencies. A lack of efficiency measurements for shipping firms leads to a significant gap in determining their overall performance. Research design, data, and methodology - Each of DEA scores was adopted for the evaluation and panel regression was used to examine the impact of determinants on the performance. The analysis included 50 shipping firms from three maritime transport markets as follows; 15 firms of container liners, 18 firms of bulk carrier and 17 firms of tanker carriers, and its period was from 2010 to 2016. Results - In the CCR model, container liners were the highest, tanker carriers were the second, and bulk carriers were the lowest in operation efficiency and financial efficiency. By region, operation efficiency and financial efficiency was high in the order of America, Asia, and Europe. Conclusions - This study suggests business strategies for maritime transport companies based on the analytical results of determinants of operational and financial efficiency.

• 무역학회지
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• 제45권1호
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• pp.47-64
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• 2020

For the past few years, the Korean government has been consistently expanding its national research & development budget to accelerate economic growth through technology innovation and the enhancement of international competitiveness in global markets. The objective of this paper is to define the concept and analyze the current status of national R&D programs by measuring R&D efficiencies. We determine R&D efficiency by reflecting inputs and outcomes of the five main agricultural R&D programs between 2010 to 2015, and by categorizing and regrouping figures that may affect R&D performance. Among 1,128 targeted projects, 832 projects with patents and thesis were selected for analysis in terms of measuring technology efficiency, pure technology efficiency, and efficiency of scale. Also, the Kruskal-Wallis test was also utilized as well. As a result of empirical analysis, figures that affected the efficiency level of national R&D programs included differences in research resources, research management levels and skills, and research field. This study can be utilized as a reference for re-establishing national agricultural R&D policies, such as enhancement of national technology competitiveness in the global market environment, improving and adapting to new agricultural conditions, market expansion, national agricultural R&D efficiency, aging rural population, agricultural management cost increase, and climate change mitigation.

• 설비공학논문집
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• 제23권10호
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• pp.656-661
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• 2011

The amount of water resources that can be used tend to be decreased gradually. In contrast, the rapidly increasing water consumption is a problem that need to be addressed. Renovation and equipment replacement to improve energy efficiency and to reduce expenditure for building usage is required. But the excessive initial investment cost and the prolonged of pay back period may be uneconomical choice. Water usage for cleaning the toilet bowl accounts for 27%of the total water usage. Water-saving valve that can select the amount of water for cleaning toilet bowl can be reduced expenditure. After installing water-saving valve, analysed the economic effects. Water-saving valves compared with flush valves, and researched the amount of water usage. Then analyzed for the economic effects. Water-saving valve was used 5.6 ${\ell}$/time for cleaning toilet bowl. In contrast, flush valve was consumed 8.4 ${\ell}$/time. Water-saving valve's water-saving rate was 33.3%. The initial payback period for Water-saving valve was 459.5 days. By a small investment in water saving valve, the economic benefits can be obtained.

• 에너지공학
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• 제27권4호
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• pp.50-63
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• 2018

화석연료의 무분별한 사용으로 인해 지구 온난화 및 환경오염 문제가 대두되고 있으며, 이에 따라 효율적인 에너지 활용을 위해 기존에 버려지는 폐열을 회수하는 기술에 대한 필요성이 커지고 있다. 산업폐열 발전 시장은 발전효율을 높일 수 있다는 장점으로 인해 연평균 5% 성장하고 있다. 고효율 폐열발전시스템 설계를 위해 열원별 조건에 따른 발전 기술별 경제성을 평가할 수 있는 프로그램 개발이 필요하다. 따라서 본 연구에서는 산업폐열 발전시스템에 최적화된 경제성분석 모듈 개발을 위해 균등화 전력원가를 산출하는 모듈을 개발하고 NETL의 경제성분석 사례를 바탕으로 시스템의 신뢰도를 검증하였다. 검증 결과, 오차율은 약 6~7%로 사업 타당성 평가를 위한 정확도를 만족하였으나, 신뢰성 향상을 위해 NETL에서 사용하는 균등화 방법론을 적용하여 알고리즘을 개선하였고 이에 따라 오차율은 1% 미만으로 신뢰도가 향상되었다.

• 한국터널지하공간학회 논문집
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• 제21권1호
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• pp.79-92
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• 2019

본 논문에서는 공동구 도입과 관련하여 초기 기본 계획 단계에서 보다 효율적으로 수용시설물의 설치여부를 결정하기 위한 기법을 제시하였다. 이를 위해 수용시설물의 구성과 종수를 결정하기 위한 평가체계를 정립하였다. 7개의 수용시설물에 대하여 98개의 조합을 분석하였으며, 수용시설물 평가체계를 위하여 타당성 및 경제성과 관련된 지표 중 기본 계획단계와 관련된 지표를 선별하였다. 선별된 항목을 반영하여 공간적, 효과적, 비용적 평가로 분류된 평가체계를 제시하였으며, 가중치 설정을 위한 AHP분석을 실시하였다. 본 연구의 결과는 공동구 설치를 위한 기본 계획 단계에서 설계자를 포함한 사용자들이 공동구내 수용시설물을 결정하는 과정에서 시간을 단축하고 효율성을 높이는데 도움이 될 것으로 판단된다.

• 한국연소학회지
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• 제18권3호
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• pp.1-8
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• 2013

Thermodynamic and economic analyses of various types of gas turbine combined cycle power plants have been performed to establish criteria for optimization of power plants. The concept of efficiency, in terms of the difference in energy levels of electricity and heat, was introduced. The efficiency of power and heat generation by power plants with other purposes was estimated, and power generation costs were figured out for various types of combined heat and power plants(i.e., fired and unfired, condensing and non-condensing modes, single or double pressure HRSG).

• Design & Manufacturing
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• 제16권2호
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• pp.20-25
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• 2022

In line with the rapid economic growth of many countries, fossil fuel energy sources are also rapidly depleting. Therefore, the price is also rising rapidly, so it is necessary to develop new and renewable energy sources such as hydropower, geothermal power, nuclear power, wind power and solar energy to replace fossil fuel energy in the future. In this study, development of rotating concentrator module system, development of rotating module control control system, development of lamp and charge control controller, configuration and prototype production of rotating concentrating solar LED street light system, efficiency of rotating concentrating solar LED street light, and power production. The research was conducted in the order of evaluation of comprehensive performance tests such as consumption and consumption. As a result, the developed high-efficiency rotation-concentrating hybrid solar LED street light module system has a 50% higher light-gathering efficiency than existing products by tracing sunlight by self-developing a rotation-collecting module on existing solar LED street lamps according to the characteristics of Korea's topography. and the power generation was improved by more than 40%.

• 한국항만경제학회지
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• 제31권1호
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• pp.171-188
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• 2015

물류시스템은 점점 더 중국의 경제성장을 위한 중요한 원동력 중 하나로 인정받고 있습니다. 물류효과의 폭이 넓어의 범위와 중국의 물류인프라, 물류산업의 발전과 함께 급속한 발전을 이루었습니다. 이 논문은 중국에서 2003년부터 2012년까지 기간 동안 31 지방을 포함하는 데이터 집합을 사용하여, 물류 발전과 경제 성장 사이의 관계를 조사합니다. 요인분석은 국가경제성장의 물류의 발전에 미치는 영향을 정의물류함수의 전체평가를 얻기 위해 적용됩니다. 고정효과패널 데이터의 접근방식에 따르면, 중국의 경제성장에 물류발전의 중요하고 긍정적인 영향은 그사이에, 해안지방과 내장 지방 사이 의 경제발전에 대한비교분석 도 실시, 발견된다. 결과는 경제성장에 물류발전의 영향은 서부지역에 비해 동부지역에서 높은 것이 좋습니다.

• 한국지반공학회논문집
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• 제39권5호
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• pp.41-50
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• 2023

본 연구에서는 국내외에서 널리 사용되고 있는 액상화 보강 및 지반 보강 공법들에 대해 공법 특성별로 검토하고, 각 보강방안의 경제성 및 보강효과를 분석하였다. 또한 분석 결과를 바탕으로 신설구조물 및 기존구조물의 액상화 보강시 적절한 보강 방안 적용성 평가를 수행하였다. 보강방안 별 경제성, 보강효과를 바탕으로 보강 방안의 적용성을 평가한 결과, 신설 구조물의 보강시에는 대형장비를 적용하여 시공성이 확보되는 다짐계열 공법이 유리하며, 기존 구조물에서는 저유동성 몰탈 주입공법(C.G.S공법) 및 고압분사공법(J.S.P공법)의 적용이 적절할 것으로 판단된다.