• 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.

• 한국건축시공학회지
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• 제4권4호
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• pp.135-142
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• 2004

The purpose of this study is to predict remodeling timing of Permanent Rental Housing through historic data and cash flow analysis. For this aim, the study has estimated cash flow of Permanent Rental Housing considering initial construction costs, government supporting fund, rental incomes and maintenance expenses. Based on the expected cash flow analysis, reasonable remodeling timing is predicted for Permanent Rental Housing. The results of this study are as follows: (1) it is analyzed that building a8e of about 27 years is the best time for remodeling because cumulative surplus amounts reach maximum level, (2) it is required that remodeling should be made before 34 years of age roughly because cumulative surplus amounts change into minus from this time.

• 한국건축시공학회지
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• 제5권4호
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• pp.91-98
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• 2005

This paper illustrates a comparative analysis on the economic efficiency of remodeling method that is one of major factors in totting more desirable standards and proposes to utilize LCC calculation techniques in generating a required budget for more effective quantity-based analysis that is both objective and effect. Rather than comparing only the initial lost of two different methods, it seems through to compare their entire life cycle cost that includes any repair and reconstruction/ remodeling expenses, thus generate overall quantitative analysis in objective perspective

• 한국IT서비스학회지
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• 제7권3호
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• pp.129-144
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• 2008

The uncertainty of software projects makes a big gap between the initial schedule/expense and the final one. Moreover, it is difficult for a project manager to reschedule and re-budget for reflecting the effects of changes in the software development. In this paper, we suggest EVM (Earned Value Management) to control the schedule and the expenses of an on-going software development project. In order to apply EVM to a software project, we consider turnkey contracts and propose the way to calculate the earned value for the software development. Finally, we illustrate our method with the case of N-company. We expect our EVM help to analyze and to predict the final schedule and the expense of a software development project.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.235-240
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• 2005

Recently urban utility plants in urban areas of Korea, such as energy supply systems, municipal waste incineration systems, sewage treatment systems and so on, have caused some critical troubles, for instance the insensitive response to the seasonal or daily variation of loads, the low system efficiency and inefficient use of energy because of the large-scale system located a great distance. Therefor the design method of optimal integrated system model of various urban utility plants proposed in this study suitably to the present situation of Korea. Also, the effect analysis for the introduction of compound utility plants was studied for a new town model on a 60,000 persons scale. As the results we found that the complex plant was superior to individual urban utility plant in side of the initial investment expenses, the operating cost and other reasons.

• 대한안전경영과학회지
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• 제9권4호
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• pp.121-127
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• 2007

CSP(Concurrent Spare Parts) is supplied with the procurement of new equipment or weapon system and is used to sustain the equipment without resupply during the initial coverage period. This study is concerned with a problem of determining the near optimal inventory level of the spare parts, especially Concurrent Spare Parts. For this, we utilize the mixed periodic and continuous review polices considering the CSP and (r,Q) Policies concurrently in a two-echelon distribution system. We propose the mathematical model to minimize the total cost which is composed with ordering cost, purchasing cost, holding cost, and stickout cost. If the mixed policy is compared to other policies(CSP, (r,Q)), the proposed methodology performs well and is best policy in the equipment maintenance expenses.

• 한국건설관리학회논문집
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• 제6권6호
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• pp.171-180
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• 2005

공공임대주택은 공공이 건설, 소유하고 관리하는 임대주택으로 사업주체는 건설부터 폐기처분에 이르는 전 과정을 관리하게 된다. 일반분양주택 사업주체가 초기투자비에 적극적인 관심을 보이는 반면, 공공임대주택 사업주체는 초기투자비와 더불어 건물의 유지보전을 위해 지출되는 수선비에 관심을 기울이지 않을 수 없다. 하지만 국내 공공임대주택의 수선비용은 단지 회계상의 지출요소로 관리되어 왔을 뿐, 체계적인 실태조사 및 분석에 대한 선행연구가 많이 부족한 실정이다. 따라서 본 논문은 공동주택 LCC모델링이나 수선비 예측모델의 신뢰성 향상 및 실무적 활용성 제고를 목적으로 공공임대주택에 지출된 수선비 실적자료를 바탕으로 통계적 방법을 활용, 경과연수와 지출비용과의 관계, 단지별 수선비 지출차이, 준공 후 시기에 따른 수선비 지출 경향에 초점을 맞추어 실태를 분석하였고, 단지별 수선비 지출격차가 발생하는 원인과 경과 연수에 따른 수선비 변화의 특성을 파악하여 제시하였다.

• 가정과삶의질연구
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• 제26권2호
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• pp.83-101
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• 2008

This research performs a multi comparison between the age of old households and the economic structure according to accommodation type as well as analyzing the economical structural difference of each type based on the features of aged households. The paper classified aged households into 3 groups according to age distribution. The economic structure analysis according to the age of old households and accommodation type was shown as follow: First, the economical structural analysis based on the age of old households showed a statistical difference in the total, labor, business, property and transfer income variables according to the age of each sample group. However, the non-business income and liabilities did not show a significant difference. Second, in the analysis of different economic earnings and initial expenses of middle-aged households according to the age distribution group showed a disparity in the total, labor, business, property, and transfer income variables according to the age of each sample group. However, aged households showed a statistical difference in total, labor, business and transfer income variables. Third, in the analysis of difference in the expense provision and size of consumption, there was a statistical difference in the expense variables of total consumption, food, dining out, electricity, water, furniture, kitchen supplies, clothing, shoe, education, culture, entertainment, transportation, and communication. Fourth, in the analysis of difference in the size of consumption expense, the initial and middle-aged households showed a statistical difference in the total consumption, food, dining out, electricity, water, furniture, kitchen supplies, clothing, shoe, education, culture, entertainment, transportation, communication, and consumption expense variables. However, the analysis of aged households has shown a statistical difference in the total consumption, food, dining out, electricity, water, furniture, kitchen supplies, clothing, shoe, education, culture, entertainment, transportation, and communication expense variables. The study found a statistical difference in the expense for hygienics that did not appear in the initial and middle-aged households.

• 한국산림과학회지
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• 제107권3호
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• pp.316-323
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• 2018

본 연구는 고사리, 곰취, 산마늘 등 주요 산채류에 대한 재배공정을 조사하여 소득분석을 실시함으로써 향후 임산물에 대한 손실보상 기준 및 임업경영진단 등에 필요한 기초자료를 제공하기 위하여 실시하였다. 조사결과 품목별 재배형태는 크게 노지재배와 산지재배로 구분되었다. 품목별 단위면적당($3.3m^2$) 연간 평균소득은 고사리 노지재배는 6.5천원, 고사리 산지재배는 3.2천원, 곰취 노지재배는 20.4천원, 산마늘 노지재배는 20.9천원, 산마늘 산지재배는 7.3천원 등으로 나타났다. 특히, 최근 소비자 수요가 크게 증가하고 있는 산마늘과 곰취의 노지재배 단위면적당($3.3m^2$) 연간 평균소득은 고사리에 비해서 매우 높은 것으로 분석되었다. 이러한 원인은 고사리 재배 시 경영비(토지임차료, 고용노동비)의 투입비중이 타 품목에 비해 매우 높기 때문이다. 연간 평균소득이 높은 곰취와 산마늘의 경우 종묘 및 종근 구입 등 초기 투자비용이 경영비의 평균 40% 이상을 차지하고 있어 향후 농산촌지역의 소득원 및 재배 활성화를 위해서는 이에 대한 정부의 적절한 지원이 필요할 것으로 판단된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제8권2호
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• pp.55-61
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• 2003

본 연구의 목적은 반응벽체 매질로서 제올라이트의 표면특성을 계면활성제로 변화시켜 제조한 SMZ로 충진된 컬럼 시험을 수행함으로써 질산성 질소의 제거특성을 조사하는 것이다. SMZ컬럼 실험에서 얻어진 파과곡선의 해석결과를 이용하여 일차원 이류확산모델을 통해 예측되는 반응벽체의 질산성 질소(N $O_3$$^{-}$-N)제거효과와 실제 소규모 반응벽체 설계의 기본 인자 도출을 통한 설계방법론을 제시하였다 SMZ충진 컬럼 내 질산성 질소의 파과에 대한 예측이 선형 평형 흡착 이동모델을 이용하여 수행될 수 있음을 알 수 있었다. 유량을 변화시키면서 수행한 파과실험을 통해 얻은 파과시간과 반감기( $t_{\frac{1}{2}}$)는 유량의 크기에 반비례함을 알 수 있었다. 질산성 질소농도가 50mg/L인 지하수를 10 $m^3$/day의 처리용량으로 음용수 수질기준인 10mg/L로 감소시키고자 할 경우, 300 ton의 SMZ를 사용하여 약 6년 간 (5.8년)매질의 교체 없이 SMZ 반응벽체를 사용할 수 있을 것으로 예측되었으며, 초기 건설비용과 조사비용 등을 제외하고는 6년에 한 번씩 교체를 위한 매질비용으로 약 1억 6천 5백만 원과 주기적으로 간단한 유지관리와 모니터링 비용이 소요될 것으로 예측되었다.