• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1176-1182
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• 2009

Due to recession in real estate market, interest of risk analysis is increasing. Feasibility study in the first stage takes a great role in a project. There are not objectified tools which are able to cope with uncertainty of project, and feasibility study based on selected method of determinism does not include liquidity of weight risk. Also, shortage of consideration for subjective and atypical external factors causes inappropriate results. Therefore, this study proposes feasibility study model focused on risk factor influences in construction cost and sales cost. Considering effective level of cost based on objective risk factors and probable weight of risk by this model, real workers are able to bring correct and scientific decisions better than former method based on selective analysis of real estate development.

• 산업공학
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• 제25권3호
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• pp.347-356
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• 2012

The acquisition cost of defense weapon system has been continuously increasing because of art-of-technology of it. This phenomenon requires efficiency and transparency in the weapon system acquisition process through cost estimation. Therefore cost estimation is very important to the government acquisition programs to support decisions about funding and to evaluate resource requirement as a key decision point. The Commercial parametric cost estimating models have been using extensively to obtain appropriate cost estimates in early acquisition phase. These models have many restrictions to ensure the cost estimating result in Korean defense environment because they are developed based on foreign R&D data. Also estimation results are different from Korean defense industry accounting system. So, some studies have been tried to develop a CER (Cost Estimation Relationship) based on the Korean historical data. However, there are some restrictions to improve the predictability and ensure the stability of the developed singular CERs which consider the following data characteristics individually. The the abnormal conditions of data that is multicollinearity, outlier and heteroscedasticity under rack of the number of observations. In this paper, a CER's Linear Combining Model is proposed to overcome those limitations which guarantee more accurate estimation (25.42% higher precision) than other singular CERs. At least, this study is meaningful as a first attempt to improve the predictability of CER with insufficient data. The methodology suggested in this study will be useful to develop a complex Korean version cost estimating model development in future.

• 경영과정보연구
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• 제33권2호
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• pp.301-315
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• 2014

부산의 금정산은 도시 숲의 중요성이 부각되면서 시민들의 방문이 증가하고 있으며 이로 인해 생태계 보전을 위한 비용은 증가하고 있다. 도시 숲에 대한 보전과 이용의 양 측면을 고려하면서 지속가능한 환경자원으로서 금정산을 보호하기 위해서는 비용편익 관점에서 정책적 판단이 중요해지고 있다. 이와 관련하여 도시 숲의 편익을 화폐적 가치로 측정하여 환경정책의 경제적 효율성을 확보하자는 취지에서 금정산의 가치를 추정하였다. 본 연구에서는 금정산을 당일 방문한 20세 이상의 성인 남녀를 개인면접의 방식으로 설문을 조사하여 개인여행비용법(ITCM)으로 가치를 추정하였다. 종속변수인 여행횟수가 특성상 비음정수이므로 가산자료모형인 포아송 모형, 음이항 모형, 절단된 포아송 모형 및 절단된 음이항 모형을 사용하였다. 분석결과를 바탕으로 추정된 금정산의 1회 여행에서 얻은 경제적 가치는 60,669원이고, 총경제적 가치는 252,383원으로 계산되었다. 여행비용(COST)을 적용하였을 때 절단된 음이항 모형으로부터 관광수요모형을 추정하여 보니 예상했던 바와 같이 여행비용(COST)이 적을수록 여행 횟수가 증가하였고, 연령(AGE), 결혼여부(MAR), 그리고 경관 만족도(SATI)는 방문수요에 영향을 미치지 못하는 것으로 분석되었다.

• 대한전기학회논문지:전력기술부문A
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• 제50권9호
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• pp.431-439
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• 2001

This Paper illustrates a new numerical analysis method using a nodal effective load model for nodal probabilistic production cost simulation of the load point in a composite power system. The new effective load model includes capacities and uncertainties of generators as well as transmission lines. The CMELDC(composite power system effective load duration curve) based on the new effective load model at HLll(Hierarchical Level H) has been developed also. The CMELDC can be obtained from convolution integral processing of the outage capacity probabilistic distribution function of the fictitious generator and the original load duration curve given at the load point. It is expected that the new model for the CMELDC proposed in this study will provide some solutions to many problems based on nodal and decentralized operation and control of an electric power systems under competition environment in future. The CMELDC based on the new model at HLll will extend the application areas of nodal probabilistic production cost simulation, outage cost assessment and reliability evaluation etc. at load points. The characteristics and effectiveness of this new model are illustrated by a case study of MRBTS(Modified Roy Billinton Test System).

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.922-925
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• 2008

Many highway projects are under way in Korea. However, owners frequently find that the project cost exceeds the budget and they are unable to identify the underlining reasons. The main purpose of this research is to develop cost models for transportation projects in Korea using the multiple linear regression (MLR). The data consist of 27 completed transportation projects, built from 1991 to 2001, The technique of multiple regression analysis is used to develop the parametric cost estimating model for total budget cost per highway square meter (TBC/$m^2$). Findings of the study indicated that MLR car be applied to highway projects in Korea. There are twf) major contributions of this research. (1) the identification of transportation parameters as a significant cost driver for transportation costs and (2) the successful development of the parametric cost estimating models for transportation projects in Korea.

• Journal of Construction Engineering and Project Management
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• 제4권3호
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• pp.13-20
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• 2014

Estimating time and cost is an important mission in the early phase of a construction project, especially in feasibility study. It provides a foundation for making decision whether or not the project is performed on schedule and within budget. Thus, reliability of this estimate plays a key role in measuring the success of a project. This study was carried out to investigate the time-cost relationship in building construction projects in Bangladesh. The mathematical equation used in this study is based on Bromilow's equation. The research data were collected from sixty-three completed building projects through questionnaire survey. Type of clients, type of projects, and tender methods are the project characteristics considered in this study. The results of analysis indicated that the Bromilow's time-cost (BTC) models developed for each project characteristic are appropriate due to quite high coefficient of determination and relatively small mean percent errors. Among them, the forecasted model for time and cost according to tender methods is the best fit model. It is concluded that the BTC model could be applied in building construction project to predict its time and cost in Bangladesh. Four different regression models were also developed in this study. The results of BTC model between some selected countries were compared to gain the comprehensive view.

• 한국디지털건축인테리어학회논문집
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• 제10권3호
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• pp.11-18
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• 2010

Cost estimation through fast and correct quantity take offs are crucial in the process of construction project. The existing methods for cost estimation are mainly based on 2D-based drawings and the estimation result tends to be different according to the estimator's experience, the quality and quantity of used information and estimation time. To solve these problems, the domestic construction industry have recently tried to use the data extracted from 3D data modeling based on BIM(Building Information Modeling) in order to achieve more accurate and objective cost estimation. However it tends to increase dramatically the quantity of information that can be used in cost estimation by estimators. Therefore in order to achieve quality information data from 3D data modeling, the characteristics of the project should be reflected on the 3D model and it is most important to extract information only for cost estimation from the whole 3D model fast and accurately. Thus this study aims to propose the 3D modeling method through Data Normalization which maximizes the usability of 3D Data modeling in cost estimation process.

• 설비공학논문집
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• 제12권10호
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• pp.950-961
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• 2000

The objective of this study is to develop optimal alternative selection model for renewing building equipments system. Cost Breakdown Structure of LCC in HVAC systems are deduced from resonable data and factors. As for Cost Breakdown Structure of LCC in HVAC system, pertinent level, title, CBS number, and block number are determined efficiently. Especially, in addition to current cost factor, it is possible to make Cost Breakdown Structure using present worth method more clear. A model of POWER LCC ver 1.0 used to analyze primary cooling system, heating system, and air conditioning system are POWER LCC ver 1.0_/sub SYSTEM/ : C1+ C2- C3+ C4+ C5+ C6+ C7±C8+ C9- C10/sub -1/+ C10/sub -2/+ C10/sub -3/, and is implemented with consideration of Cost Breakdown Structure and their summation using present-worth method. It is programmed with one of scientific languages, MATLAB 5.3.

• 한국건축시공학회지
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• 제15권3호
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• pp.307-316
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• 2015

공공건축물공사의 실적공사비제도에서 공사규모에 대한 건축공사비 차이가 크게 나타나므로, 산정방식에서 많은 문제점으로 제기된다. 이에 공사규모에 따라서 선별적, 차등적으로 적용할 예측모형의 개발이 필요하다. 이에 본 연구는 조달청에서 2011~2012년에 발주한 이미 준공된 42개 현장의 실적자료에서 공사규모 $5,000m^2{\sim}20,000m^2$으로 선정하여, 회귀분석을 통해서 추정된 모형을 도출하였다. 이를 근거로 신규공사에 적용하여 검증함으로써 합리적인 건축공사비 예측모형을 제시하였다.

• 디지털융복합연구
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• 제10권6호
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• pp.361-368
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• 2012

우리나라의 이러닝 산업계에서 이러닝 콘텐츠를 제작하는 사업자들은 안정적으로 흑자구조의 사업을 운영하지 못해 진출과 퇴출이 심하거나 영세한 열악한 산업구조를 보이고 있다. 이는 이러닝 산업의 유통구조 내에서 이러닝 콘텐츠 제작과 관련한 많은 문제점 중에서 이러닝 콘텐츠 개발단가에 중대한 문제점이 있기 때문이다. 본 연구는 이러닝 콘텐츠 제작에 필요한 개발단가를 조사하고, 유사한 다른 산업분야와의 비교분석을 통해 합리화 방안을 제시한다. 이러닝 사업의 건전한 유통구조를 위해 각 사업영역 분야별 적정 개발단가 모형을 설계한 후, 전문가 및 기업체 책임자에 대한 인터뷰 실사를 통해 이러닝 콘텐츠와 서비스에 대한 유통구조의 문제점 분석하여 이러닝 개발 용역 표준단가기준안을 도출하였다. 동시에 이러닝 콘텐츠 개발단가 적용을 위한 제도적인 개선방안도 제시하였다.