• 한국건설관리학회논문집
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• 제4권4호
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• pp.106-113
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• 2003

The purpose of this thesis is to provide an appropriate trade-off information for the conflicting interests caused by the various factors between building owner and contractor during selecting the contractor and performing the construction work, in which the construction was contracted by open bidding from the government or private organizations. In order to propose the legitimate evidence, the differences between the domestic contract sheet of drawing change and the process of drawing change and those of the foreign countries were compared and analysed The number of construction ordered in Youngdong area in 2001 whose construction expenses are more than 100,000,000 won is 218 items and 147,005,000,000 won in total cost Among them, the number of 218 items whose total cost amounts to 16,705,000,000 (11.36$\%$) is in case of increase of construction expenses due to the drawing changes, and the number of 48 items whose tool cost amounts to 2,009,000,000 won (1.37$\%$) is the case of decrease. In conclusions, the contractor could have more benefits than the building owner in case they submit the detailed estimate sheet without eliminating the increasing expenses of construction. It is shown that the building owner's loss is increasing whenever the labor cost is higher material cost Therefore, this thesis proposes a proper standards for the harmonious compromise between the contractor and the building owner for the problems caused by the drawing changes when the contract agreement is occurred.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.153-158
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• 2017

Procurement system of public construction projects in Japan is changing with diversity in rapid pace. The quality assurance and risk management of construction projects should be more certain as the projects are turning into larger scale and more complexed. The clients in the public sector will want to make the relation of responsibility among the client, the designer (architects and engineers), and contractor clearer in terms of role and risk. Public-Private Partnership (PPP) is one of the methods for collaboration of the public sector and the private sector in public construction projects where the public utilizes the ability and suggestion of the private. Private Finance Initiative (PFI), Design-Build-Operate (DBO), market testing, designated manager system, outsourcing of tasks in local governments are well-known as examples of PPP in Japan. Indeed, there is an obvious trend that Design-Build (DB) is adopted in public construction projects in many countries including Japan. In this paper, the public construction projects in various procurement systems are surveyed and analyzed. They are not limited within the traditional procurement, Design-bid-Build, a separate order system of design and construction. Design-Build or PFI are adopted. In particular, contract by wide range including maintenance of equipment can be found. On the other hand, modification from originally typical PFI is taking place, such as concept design and project finance are removed from the roles and the tasks of the special purpose company (SPC) in PFI. Standard roles and tasks in a construction project are modeled in this paper.

• 한국건축시공학회지
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• 제3권3호
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• pp.113-120
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• 2003

The purpose of this thesis is to provide an appropriate trade-off information for the conflicting interests caused by the various factors between building owner and contractor during selecting the contractor and performing the construction work, in which the construction was contracted by open bidding from the government or private organizations. In order to propose the legitimate evidence, the differences between the domestic contract sheet of drawing change and the process of drawing change and those of the foreign countries were compared and analysed. The number of construction ordered in Youngdong area in 2001 whose construction expenses are more than 100,000,000 won is 218 items and 147,005,000,000 won in total cost. Among them, the number of 218 items whose total cost amounts to 16,705,000,000 (11.36%) is in case of increase of construction expenses due to the drawing changes, and the number of 48 items whose total cost amounts to 2,009,000,000 won (1.37%) is the case of decrease. In conclusions, the contractor could have more benefits than the building owner in case they submit the detailed estimate sheet without eliminating the increasing expenses of construction. It is shown that the building owner's loss is increasing whenever the labor cost is higher than material cost. Therefore, this thesis proposes a proper standards for the harmonious compromise between the contractor and the building owner for the problems caused by the drawing changes when the contract agreement is occurred.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.986-991
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• 2005

Intense competition existing in construction market creates an industry that is dominated by the client groups. Numerous studies dealing with private clients' needs and expectations from contractor firms exist in the literature. However in the unique construction industry, in addition to clients, consultants as representatives of clients will almost always have very important roles to play as well. By presenting survey findings of 50 consultant firms, this study provides insights into consultants' general needs and expectations from contracting organizations on behalf of their clients by using the data from Northern Cyprus private building construction market.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.704-710
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• 2007

This paper examines the operations of private housing developers (PHDs) based on Social Network Theory. PHDs need to choose the best consultants, contractors and suppliers (CCS) to make sure the project run and complete successfully. PHDs gather the scarce resources from the external environment through personal network. This research used the social network method which relies on alliances based on network, social, tie and trust. The more people/firm PHDs network with, the better chances of finding the right CCS.

• 건축역사연구
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• 제29권2호
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• pp.7-18
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• 2020

The purpose of this study is to examine the construction industry of Korea from the 1920s to the 1930s by analyzing activities of construction-contractors trying to overcome the recession of the construction industry and intensified competition in the industry. In this paper, I looked at the activities of Hanazono Sakichi as concrete examples. First of all, with the strategy of the vertical integration, by manufacturing and selling building materials, Hanazono Sakichi expanded his company and the scope of contract business. The second, he attempted to diversify related projects. Through related diversification, he seemed to have earned not only land management profit but also advantages from related construction. These aspects were not only seen by Hanazono's activities but also by other contractors'. On the other hand, a few contractors have taken over a trust company to secure the funds for land management. Attempts to maximize personal interests through the expansion and diversification of contractors' business can be seen as overcoming the pre-1920s environment, where almost construct works were ordered under the government, and creating opportunities for the private sector to work and make profit by themselves. In the end, it can be mentioned that 'the contractor' established 'the construction industry' through this process.

• 한국건설관리학회논문집
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• 제8권5호
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• pp.152-160
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• 2007

최근 정부는 사회간접자본 시설확충사업을 시행함에 있어 민간투자 유치를 통한 재원확보에 매우 적극적이다. 그러나 민간투자자들이 민자사업에 적극적이지 못하게 하는 원인 중 하나는 사업의 추진과정에서 발생 가능한 다양한 위험에 대한 지식이 부족하다는 점이다. 본 연구는 국내 엔지니어링 전문회사인 A사가 민자사업 사업관리 주 계약자로 활동하기 위한 준비업무로서 잠재적 투자자에게 제출할 위험관리계획서의 일부로 수행되었으며, 기존 위험요인 체크리스트의 한계를 극복하고 A사의 요구사항들을 만족시키는 새로운 개념의 민자사업 위험요인사전을 개발하였다. 민자사업 위험요인사전은 위험요인을 3차원적으로 분류하고, 영향도와 대응전략을 서술식 및 복수항목으로 표현하며, 대응주체를 명시한 단순화된 일람표임에도 불구하고, 이를 개발하는 과정에서 단순화된 일람표를 뛰어넘는 많은 직 간접적 성과를 이루었다는 것에 큰 의미가 있다고 하겠다.

• 산업진흥연구
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• 제9권2호
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• pp.69-75
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• 2024

한국은 경제 규모, 기술경쟁력 등 다수의 주요 지표에서 선진국 대열에 진입하였으나, 산업재해 재해율은 여전히 OECD 국가 중 최하위권 수준이며, 최근에도 각종 건물 붕괴 등으로 다수의 근로자 또는 시민이 사망하는 후진국형 재해가 발생하고 있다. 고용노동부의 2022년 산업재해 현황분석에 따르면 2022년 전산업 업무상 사고사망자 874명 중 건설업 업무상 사고사망자는 402명이며 이는 전체 사고사망자의 약 46%를 차지한다. 특히, 건설업 사고사망만인율은 1.61로 전산업 사고사망만인율인 0.43이 비해 월등히 높은 수준이며, 건설업은 광업 12.18, 어업 1.80 다음으로 사고사망만인율이 높아 그 심각성을 나타내고 있다. 건설공사를 유형에 따라 민간공사와 공공공사로 나누어 볼 때 민간공사가 수주 및 기성 금액면에서나 사고 건수, 사망자수에서 공공공사보다 월등히 높은 수치를 기록하고 있다. 하지만 공공기관에 비해 대다수의 민간 발주자는 안전보건 활동이 미비하고 안전보건체계 구축이 되지 않은 곳이 많다. 본 연구는 민간 발주자의 안전보건 체계 구축과 안전보건활동 강화의 필요성에 대한 제언을 통하여 민간 발주자에 경각심을 알리고 앞으로 선진적인 민간 발주자의 안전보건 발전 방향에 대해 고찰해 보고자 한다.

• Journal of Construction Engineering and Project Management
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• 제5권1호
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• pp.11-19
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• 2015

This paper presents optimized artificial neural networks (ANNs) claims prediction and decision awareness framework that guides owner organizations in their pre-bid construction project decisions to minimize claims. The framework is composed of two genetic optimization ANNs models: a Claims Impact Prediction Model (CIPM), and a Decision Awareness Model (DAM). The CIPM is composed of three separate ANNs that predict the cost and time impacts of the possible claims that may arise in a project. The models also predict the expected types of relationship between the owner and the contractor based on their behavioral and technical decisions during the bidding phase of the project. The framework is implemented using actual data from international projects in the Middle East and Egypt (projects owned by either public or private local organizations who hired international prime contractors to deliver the projects). Literature review, interviews with pertinent experts in the Middle East, and lessons learned from several international construction projects in Egypt determined the input decision variables of the CIPM. The ANNs training, which has been implemented in a spreadsheet environment, was optimized using genetic algorithm (GA). Different weights were assigned as variables to the different layers of each ANN and the total square error was used as the objective function to be minimized. Data was collected from thirty-two international construction projects in order to train and test the ANNs of the CIPM, which predicted cost overruns, schedule delays, and relationships between contracting parties. A genetic optimization backward analysis technique was then applied to develop the Decision Awareness Model (DAM). The DAM combined the three artificial neural networks of the CIPM to assist project owners in setting optimum values for their behavioral and technical decision variables. It implements an intelligent user-friendly input interface which helps project owners in visualizing the impact of their decisions on the project's total cost, original duration, and expected owner-contractor relationship. The framework presents a unique and transparent hybrid genetic algorithm-ANNs training and testing method. It has been implemented in a spreadsheet environment using MS Excel$^{(R)}$ and EVOLVERTM V.5.5. It provides projects' owners of a decision-support tool that raises their awareness regarding their pre-bid decisions for a construction project.

• 대한토목학회논문집
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• 제35권2호
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• pp.471-480
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• 2015

민간투자사업에 대한 부정적인 시각으로 인해 민간투자사업 시장은 축소되었으나, 최근 국내 재정사업의 축소로 인해 민간투자사업에 대한 필요성이 다시금 제기되고 있다. 민간투자사업은 건설사, special purpose company (SPC), 재무투자자 등 다양한 참여자들 간의 이해관계가 복잡하여 사업의 성과를 판단하기 위해서는 참여자 간 관점 차이에 대한 고려가 필요하나, 기존의 연구는 재무적 관점의 수익성 예측, 또는 리스크 식별을 통한 수익성 예측을 중심으로 수행되었다. 이러한 점을 고려하여 본 연구에서는 민간투자사업 주요 참여자별 특성에 따른 민간투자사업 성과예측 모델을 개발하였다. 이를 위해 첫째, 다양한 분야의 문헌고찰을 통해 민간투자사업의 조직구조를 분석하였으며, 건설사, SPC, 재무투자자의 관점에서 민간투자사업 수익성 영향요인을 도출하였다. 둘째, 도출된 수익성 영향인자들을 바탕으로 민간투자사업 관련 전문가 설문조사 및 인터뷰를 실시하였다. 셋째, 구조방정식 모델(structural equation model)을 통해 민간투자사업의 구성개념들 간에 직접효과와 간접효과를 분석하여 민간투자사업의 수익성 및 수익안정성 측면에서의 성과를 거시적으로 이해할 수 있는 모델을 개발하였다. 넷째, 모델을 통해 도출된 결과를 바탕으로 민간투자사업의 재도약을 위한 발전방안을 제시하였다. 향후 본 모델을 통해 수익성과 수익안정성 측면에서 건설사, 재무투자자, SPC 운영사의 사업성과 예측이 가능하며, 이에 따른 대응전략을 모색하는데 활용 가능할 것으로 기대된다.