• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1433-1439
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• 2009

Best value is the ultimate goal of the owner and can thus have diverse meanings according to the project characteristic, owner's purpose, user groups' payment capability, etc.. Recently, resettlement problems of the marginalized members in the urban regeneration area have been issued in Korea because they have no capability to purchase (or lease) redeveloped housing (or apartment). It means that a minimized production cost for reducing supply price of housing is a key factor in establishing the best value of the marginalized members. The lowest-price bidding system serves the purpose of ensuring a minimized production cost, but due to the low-cost investments, it creates various problems, such as sloppy construction, lowered quality, an increased LCC, and worsening profitability for builders. Thus, to help them resettle, it is necessary to supply affordable housing geared towards a certain appropriate quality and minimum construction costs. Towards this end, this study aimed to propose a cost reduction bidding system based on a technical proposal. The proposed technical-proposal-based cost reduction bidding system consists of the following components: work-unit-based, project-unit-based, and construction-period-reducing technical proposals. These components are evaluated to select the best bidder for a given project. The technical proposal based cost reduction bidding system proposed herein is expected to provide facilities with appropriate supply prices and appropriate quality levels, to bolster the technological competitiveness of builders.

• 산업융합연구
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• 제20권5호
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• pp.1-9
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• 2022

오늘날 주거형태 중 공동주택이 차지하는 비중은 매우 높다. 본 연구는 장기수선충당금과 일반보수비를 사용한 입찰공사비의 차이와 이들 두 항목의 사용액에 영향을 미치는 요인들의 차이를 분석하였다. 이를 위해 공동주택관리정보시스템에서 2017년부터 2021년까지 부산시의 대표적인 7개 구에 소재하는 공동주택단지에 대한 관련 자료를 수집하여 분석하였다. 통계분석결과 입찰형태변수가 입찰공사비에 가장 큰 음(-)의 영향을 미쳤고, 그 다음으로 영향을 미치는 요인은 장기수선충당금 사용액과 일반보수비 사용액 간에 차이가 있었다. 또한 입찰공사건수에 대한 공사년도별 입찰형태도 장기수선충당금을 사용한 경우와 일반보수비를 사용한 경우 간에 통계적 유의성에 차이가 있었다. 본 분석결과는 입찰공사비의 절감방안을 모색하는데 도움이 될 것이다. 다만 기술능력 등 좀 더 세부적인 변수의 투입을 통해 추가적인 의미를 찾기를 기대한다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.479-487
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• 2013

State Highway Agencies (SHAs) have started utilizing cost-plus-time bidding (A+B bidding) since Federal Highway Agency (FHWA) declared it operational on May 4, 1995. Although this technique has successfully accelerated many projects by incorporating construction time in the bidding competition, a framework to illustrate the interactions of incentive/disincentive (I/D) rates on the competitiveness of contractors participating in the bid competition is yet to be developed. In a previous research, authors indicated that for each bid competition there is an efficient cap for I/D rates which are dictated by the capabilities of contractors in project acceleration. However, the results of previous study were based on the assumption that there is a statistically significant relationship between cost and time. In this study, the entire cost-plus-time projects implemented by the Oklahoma Department of Transportation (ODOT) were investigated. Then the significance of relationship between cost and time were analyzed for each contractor utilizing Analysis of Variance (ANOVA) technique, and the price-time function of each contractor was determined by regression analysis. The results of the analysis indicate that there is a significant relationship between cost and time for the majority of contractors. However, a quadratic relationship is not always significant and for some contractors a linear price-time relationship is significant. The results of this project can be used not only by ODOT to optimize the incentive/disincentive rates but also by contractors to determine the most competitive strategies of other bid participants.

• 한국건축시공학회지
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• 제8권1호
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• pp.97-102
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• 2008

The report of the Korean Board of Audit and Inspection(BAI) on May 2007 indicates the problems of Life Cycle Cost (LCC) analysis and evaluation in the Design-Build(Turn-Key) and alternative bidding system. The point which the report indicates is that the cost estimation system for LCC analysis has nothing in common each other and there's no consistency among the repair cycle and ratio per facilities parts. For solving these problems, BAI demands the establishment of the guidelines for LCC analysis and evaluation from the competent authority Korean Ministry of Construction And Transportation(MOCT). The objective of this study is to develop the improvement directions for LCC analysis and evaluation which are suitable to the public construction projects especially for the Design-Build and alternative bidding system in Korea. For this study, the LCC related raws and regulations, LCC analysis guidelines of public cooperations, actual condition of LCC analysis and evaluation which include, the elements of LCC, the estimation rules of the initial cost and the maintenance cost, the analysis standards of time value of money, etc. are investigated to provide the improvement directions for LCC analysis and evaluation.

• Architectural research
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• 제13권3호
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• pp.49-56
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• 2011

Competitive bidding in construction is concerned with contractors making strategic decisions in respect of determination of bid price if contractors opt to bid. This study presents a strategy model for deciding optimum tender price with reflecting appropriate profit in competitive bidding using Bayesian regression analysis (BRA). The purpose of the developed model is to help contractors to secure suitable profitability by predicting the actual profit based on key variables. They may affect construction cost at bidding phase, ultimately which help contractors to secure high quality output. The model was tested empirically by application to a bidding dataset collected from a large South Korea contractor. BRA allows contractors to estimate more accurate actual profit by reflecting not only objective information but also subjective experiences and judgments. Consequently, the model can contribute to improvement of decision-making process for setting an optimum tender price.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.417-423
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• 2005

Contractor's opportunistic bidding behavior refers to contractor's deliberate low-bid, which cannot accord with the cost, and expectation for beyond-contractual reward (BCR), the compensation earned through cutting corners or claims after undertaking the construction project. This research applies System Dynamics to develop a model of contractor's pricing with consideration for dimensions of "cost", "market competition", and "BCR". Iterative computer simulations were performed to analyze the effects of contractor's pricing on the market price. The results were then examined by statistical analysis on data collected from 44 highway projects in Taiwan. It is found that the critical force driving the contractors to bid opportunistically is their excessive expectations in BCR under the current environment. Within the price competition mechanism, if the problem of BCR exists, even if the bidding system is further improved, contractors would still prefer opportunistic bidding behavior, and eventually make the whole construction industry operate ineffectively. Therefore, it is crucial to remedy the aforementioned BCR problem by more effective management policy.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.163-164
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• 2023

The technical proposal bidding system emphasizes the evaluation of the construction company's technical capabilities, with the aim of improving the quality and cost-effectiveness of the construction. However, in the VE analysis and proposal process for technical proposal bidding, the ideas are often reused from similar past construction projects, and the application of new construction technologies/methods is often lacking. Therefore, this study proposes a methodology for managing VE proposal information by integrating it into a BIM model using parametric modeling. This research developed database based on the existing VE proposals and new construction technology/method information from the Korea Institute of Civil Engineering and Building Technology. And by using parametric modeling, the proposed method integrate the VE database with BIM model. The methodology proposed in this study is expected to improve the reliability and effectiveness of VE-related idea proposals in technical proposal bidding.

• 한국건설관리학회논문집
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• 제4권4호
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• pp.192-200
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• 2003

본 연구는 공공건설 공사에 실적자료에 의한 공사비산정 방법의 전산화 적용을 목적으로 먼저 실적공사비의 정의 및 구조와 현행 실적공사비 운영체계 이해를 통해 전산화의 문제점 및 개선기준을 공사비 산정방법 중심으로 분석 기술하였으며 제안한 기준에 따라 전산화 알고리즘을 제시하였다. 기존 예정공사비 산정방법은 일반적인 공종별 분류에 따른 실적자료조건과 단순히 물가지수, 연면적규모에 따른 시공단가를 적용함으로서 공사비산정의 정확성이 요구되며, 본 연구는 이에 대한 개선 안으로 부위와 부분별 공종분류 방식에 의한 데이터 추출조건으로 실적자료의 적용성과 신뢰성을 높였다. 또한 물량규모에 의한 공사비 변동요인을 물량규모 대비 단가의 확률적 회귀분석으로 예측 추정하여 실행 가능한 적정 공사비 산정방법을 제시하였다. 따라서 본 연구에서는 전산화 적용 방안으로 확률적 예정공사비산정방법을 기준으로 시스템 프로세스를 각 영역별로 구축하고 그에 따른 윈도우 어플리케이션 활용 툴과 개별 전산화에 대한 알고리즘을 구축하였다.

• 한국건설관리학회논문집
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• 제2권3호
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• pp.75-82
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• 2001

과거의 입찰방식은 행정의 투명성과 공정성에 대하여 많은 문제점을 가지고 있고, 조달업체들에게도 많은 비용을 소모시킨다. 이의 해결책으로 일부 공공기관에서 전자입찰을 위한 시스템을 구축하였거나 구축 중에 있다. 그러나 이러한 시스템이 여러가지 측면에서 많은 문제점을 안고 있다. 따라서 본 논문의 목적은 문헌조사, 사례분석 및 프로세스 맵핑 기법을 활용하여 현행의 입찰업무를 분석하고, 이 결과와 구축된 시스템과 비교하여, 향후 구축될 시스템의 개선 방안을 제시하는 것이다. 본 논문의 연구결과 일반적인 입찰업무에 대하여 핵심프로세스를 식별하였으며 국내 건설분야 공공조달에 적용되고 있는 계약자선정방식을 분류하였다. 이러한 분석결과는 입찰업무의 시스템 구축의 기준으로 활용될 수 있다. 또한 향후 관련 시스템의 구축시 고려되어야 할 사항으로 통합추진체계의 구성, 정보공유를 위한 데이터 베이스구축, 국가차원의 표준화 마련 등의 방안을 제시하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2002년도 학술대회지
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• pp.131-138
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• 2002

과거의 입찰방식은 행정의 투명성과 공정성에 대하여 많은 문제점을 가지고 있고, 건설업체들에게 많은 비용을 소모시킨다. 이의 해결책으로 일부 공공기관에서 전자입찰을 위한 시스템을 구축하였거나 구축 중에 있다. 그러나 이러한 시스템이 중복투자 등 여러 가지 측면에서 많은 문제점을 안고 있다. 따라서 본 논문의 목적은 공공건설 부문의 입찰업무 현황을 파악하여 입찰 프로세스를 분석하여 문제점을 도출하고, 도출된 내용을 기초로 개선방안을 설정하여 효과를 분석, 향후 국내 공공건설분야 입찰관리 정보시스템의 모델을 제안하는 것이다.