• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.338-341
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• 2011

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 fort he 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.

• 산업공학
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• 제20권3호
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• pp.267-276
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• 2007

When a company makes a decision on an investment for a new product as a source for a new program, it is not easy for them to take a proper decision-making process in this highly volatile market. There could be several ways to make an investment decision on a new program. A company needs to choose the most suitable way of investment which is reflected current corporate circumstances and potential risks. We check up the process of the engineering economic decision in a automotive part manufacturing company. We define the gap between the theory and practice on engineering economic decisions. We present advices to make a decision desirably.

• 한국콘텐츠학회논문지
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• 제18권9호
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• pp.584-593
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• 2018

창업은 국가 경제성장에 기여하고 고용창출 효과가 크므로 국가는 창업활성화의 다양한 정책들을 추진하고 있다. 그러나 기술창업은 2016년 현재 2013년 대비 오히려 5.0%p 감소하였다. 정부가 추진하는 창업투자활성화는 벤처캐피탈과 엔젤 펀드들을 통해 창업 이후 성장기 또는 주식상장 2~3년 전의 유망한 벤처기업들에 주로 투자되며, 실제적으로 창업기의 투자와는 투자의 시기적 차이가 있고, 이러한 벤처기업에 투자하는 투자의사결정요소에 관한 연구는 많다. 창업활성화는 민간의 창업투자가 활발하도록 환경조성이 필요하며 창업기에 투자하는 민간 투자금의 현금화 가능성과 수익성에 관해 투자자들의 기대에 대한 연구가 필요하다. 창업기에는 창업자, 가족, 친구, 바보들 등의 비공식투자자들에 의해 투자되고 공식투자자들인 벤처캐피탈 및 엔젤펀드 등의 전문투자에 비해 비정형화된 투자의사결정이 이루어지는 것이 일반적이다. 본 연구는 비공식투자자의 특성과 투자의사결정요소, 그리고 투자금의 현금화 가능성 및 투자수익성이 투자의도에 미치는 영향을 분석하는 것으로서, 현금화 가능성은 자영업창업의 투자의도에 매개효과가 있고, 투자수익성은 기업창업의 투자의도에 매개효과가 있는 것으로 분석되었다.

• Journal of Forest and Environmental Science
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• 제34권4호
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• pp.352-358
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• 2018

This research paper investigates available options for implementing clean development mechanism (CDM) project in Sarawak state, Malaysia. To investigate economic feasibility, data was collected using survey and field research methods. Also, economic analysis was estimated using net present value (NPV), internal rate of return (IRR) and payback period (PBP) during the 30 years CDM: afforestation and reforestation periods. The result of economic analysis indicated that, the payback period was estimated at 9 years with 18 percent of internal rate of return (IRR). This study also highlighted that CDM biomass supply project have a lot of challenges due to the reduction and exclusion of bio-Solid Recovered Fuel (SRF), supply and demand scenario, and impact of restriction of illegal logging in Malaysia. This study results demonstrate the methodology and guideline for future CDM investment and projects.

• KIEAE Journal
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• 제13권2호
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• pp.53-60
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• 2013

This study examined the building envelope structure used in small housings near urban area which have not good energy source in relation to the application of passive design for energy saving of small-sized architectural design firms in local cities and aimed to provide the basic materials of future design direction of designers and housing owners by analyzing economy of a project in order to know the amount of energy saving and additional expenses depending on the building envelope pattern. As a result of comparing and examining the energy saving cost from the period of use compared to investment by the thickness of insulating materials based on building envelope pattern for energy saving, it was found that the thicker the insulating materials are, the more energy saving amount is. While the current bead-type insulating materials have short payback period due to low initial investment, extruded insulating materials show the difference of five years compared to bead-type insulation because of its high initial investment.

• 동력기계공학회지
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• 제8권1호
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• pp.48-54
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• 2004

In this study, waste heat of Jeju City Waste Environment Center is investigated and the utilization method is suggested with economical analysis of additional investment that needed for new facility. Energy balance of the typical facilities is considered in this study such as incineration plant and LFG power plant. The payback period of the investment which is used for the LFG power plant waste heat utilization facility is about 2.4 years and the economic profit of the facility during 10 years operation is up to 926 million won.

• 전기학회논문지
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• 제61권9호
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• pp.1260-1268
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• 2012

Recently, lack of power reserve margin was observed quite often. In this paper, we studied the method to secure power source for a short time, to cut the utility power peak load, and to reduce the users electricity bills. Emergency diesel generator of an office building is to be converted into a dual-fuel engine generator which is responsible for a portion of the peak load. Compared to the conventional diesel fuel generator, the proposed dual-fuel engine is able to reduce the generation power cost by dual-fuel combustion, and it also mitigates the building's utility power peak load by charging the building's peak load. If the dead resources (a group of emergency dual-fuel engine generators), as a Virtual Power Plant, are operating in peak time, we can significantly reduce future large power development costs. We investigated the current general purpose electricity bills as well as the records of the building electric power usage, and calculated diesel engine generator renovation costs, generation fuel costs, driving conditions, and savings in electricity bills. The proposed dual-fuel engine generation method reduces 18.1% of utility power peak load, and turned out to be highly attractive investment alternative which shows more than 27% of IRR, 76 million won of NPV, and 20~53 months of payback periods. The results of this study are expected to be useful to developing the policy & strategy of the energy department.

• Korean Chemical Engineering Research
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• 제54권3호
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• pp.320-331
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• 2016

제철소에서 부생되는 LDG (Linze Donawitz gas) 가스는 일산화탄소(CO)를 60% 이상 포함한다. LDG로부터 CO를 고순도로 분리하는 2가지 공정을 고려하였다: COSORB와 CO-PSA (pressure swing adsorption). 이 연구의 목적은 기술경제성평가(TEA: techno-economic analysis)를 통하여 이 두 공정 중 어떤 공정이 더 경제성이 높은 지를 결정하는 하는 것이었다. TEA의 기술적 측면에서는 초기투자비(TCI: total capital investment)와 총생산비용(TPC: total production cost)을 추정하기 위하여 먼저 공정흐름도(PFD: process flow diagram)를 완성하고, 물질 및 에너지 수지식을 계산한 후, 장치 종류 및 크기를 결정하였다. TEA의 경제성 측면에서는 투자회수율(ROI: return on investment) 및 투자회수기간(PBP: payback period)과 같은 경제성 판단기준을 산출하였고, ROI와 PBP에 가장 큰 영향을 주는 인자들을 찾기 위하여 민감도 분석을 수행하였다. CO-PSA 공정은COSORB 공정 보다 더 높은 ROI와 더 낮은 PBP로 인하여 경제적 우위를 보여주었다. CO의 가격은 ROI와 PBP에 가장 큰 영향을 주는 인자로 파악되었다.

• 에너지공학
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• 제10권4호
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• pp.327-334
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• 2001

산업단지와 같은 공장이 많이 밀집되어 있는 곳에서 열은 많이 버려지고 있다. 본 연구는 폐열을 신속하게 이용하기 위하여 폐열을 발굴하여 실재 사업 실행에 이르기 전까지의 내용을 단계적으로 나타내었으며 사업에 직접 적용할 수 있는 폐열 이용방안을 제시하였다. 특히, 열공급처와 수요처의 열공급 및 수요조사를 통하여 상호간의 열 이용을 분석하였으며 열공급 수송의 기본설계를 하였고 열 수요처에 공급하는 열에 대하여 경제성 및 타당성을 검토하였다. 이에 따른 실증분석에 수요처 열사용 투자회수기간은 1,909년으로 비교적 짧은 것으로 나타났다.

• 농업과학연구
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• 제24권2호
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• pp.170-181
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• 1997

The number of modernized green houses have been increased to produce high quality and high-payoff farm products. The unit investment costs per pyeong($3.3058m^2$) for building a glass house was estimated at 449 thousand won. On the other hand, the unit prices for the PC house with iron frame and the vynil house with automatic control system were revealed 365 thousand won and 93 thousand won respectively. The main objective of the study was to identify the financial feasibility of the green house investment prevailed in rural area. At present, some farmers have selected the green house without any consideration of profitability of crops and accessiblity of their fanning practices and technology. For the soundness of green house cultivation and management, the indices of finacial efficiency for the modernized green houses were necessary. The decesion making criteria such as NPV(Net Present Value), IRR(Internal Rate of Return), B/C Ratio and Payback Period were analyzed for the individual high investment facilities considering the present farmer's technology and on-farm benefits and costs. The results of the feasibility analysis of green houses were as follows: 1. In case of 100% private burden of the investment costs, NPV revealed only positive value for the vinyl house with automatic system and IRR for the house was also estimated at more than 10% and B/C Ratio was amounted to more than 1.0. On the other hand, the other glass and PC houses showed negative NPV and unacceptable B/C ratio and IRR. 2. In case of the following terms and conditions as 50% Government subsidy, 20% loans and 30% farmers burden of the total investment cost, all the green houses showed acceptable IRR, B/C Ratio and NPV. 3. The financial feasibility of the glass house was acceptable in tomato cultivation rather than in cucumber cultivation. The payback periods of cucumber were represented as 8.9 years for glass house, 8.5 years for PC house and 4.1 years for vinyl house with automatic system respectively. In conclution, the glass and PC house cultivation of high value vegetables were only acceptable under the Goverment subsidy and loan systems from the view point of farmer's financial situations. On account of the unacceptable economic rate of return, the government subsidy and loan policy for glass house cultivation should be transfered to the vinyl and pc houses in the future.