• 토지주택연구
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• 제2권4호
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• pp.479-489
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• 2011

This study aims to suggest the method to enhance the value of public construction project during contract review process considering budget reduction for project profit and public interest enhancement simultaneously. The main results of this study are as follows: (1) Current method are considered to be improved from the point that cost reduction through current method could influence performance of the object of contract without conforming to user requirements or facilities' function. (2) In order to supplement current process, the method to evaluate the variation of performance and value was established based on facility type, participants on each phase, and their requirement. (3) Case study was conducted to verify suggested method, and showed the successful application in enhancing the value of construction projects on public sector.

• Advances in concrete construction
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• 제15권3호
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• pp.191-202
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• 2023

Palm oil fuel ash (POFA) is a newly emerging pozzolanic material having high amount of silica content. Various forms of POFA were used in cement-based materials (CBMs) in replacement of cement in different dosages of low and high volume. Although, there are many researches on POFA to be used in concrete and mortar, however, this material was not practically used in the construction industry. Engineers and designers need to be confident to use any new developed materials by knowing all engineering properties at short and long terms. As durability concern, concrete pH value is one of the most important properties. Portland cement produces are alkaline initially, however, it may be reduced due to aging and its components. It is believed that by incorporation of supplementary cementitious materials in CBMs the pH value reduces due to utilization of Ca(OH)₂ in pozzolanic reaction. This study is the first attempts to understand the pH value of mortars containing up to 30% POFA under different curing conditions and its changes with time. The results were also compared with the pH of ground granulated ballast furnace slag (GGBFS) and fly ash (FA) content mortars. In addition, the compressive strength of different mortars under different curing conditions were also studied. The results showed that the pH value of control mix (without cementitious materials) was more than all the blended cement mortars indifferent curing conditions at the same ages. However, there was a reducing trend in the pH value of all mortar mixes containing POFA.

• 한국기술혁신학회:학술대회논문집
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• 한국기술혁신학회 2002년도 추계학술대회
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• pp.255-262
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• 2002

• Journal of Construction Engineering and Project Management
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• 제2권2호
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• pp.1-17
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• 2012

The automated construction machines have been recently developed to help solve the construction industry problems that significantly affect labour, productivity, quality, and profit. Despite the importance of performance analysis to commercialize the automated construction machines, previous studies have mainly concentrated on developing hardware and software of automated construction machines. This research now focuses on two objectives: (1) to propose an analysis model which can measure productivity, quality, and safety improvement rate of automated construction machines based on research and development (R&D); and (2) to develop a performance analysis system which will aid the evaluator in analysing the performance of automated construction machines. Finally, it is anticipated that the effective use of the performance analysis model and computerized system will ably develop the high-performance, automated construction machines and establish the marketing strategy to increase not only the commercial value but also the upkeep and development of construction machines.

• 한국건설관리학회논문집
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• 제17권1호
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• pp.76-82
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• 2016

기업의 의사결정은 실물옵션의 특성을 갖는 경우가 빈번하다. 이러한 옵션의 가치를 산정하는 일은 쉽지 않기 때문에 일방이 유리한, 즉 불평등한 계약이 맺어지는 경우 또한 흔하다. 기업의 합리적인 의사결정을 도모하기 위해서는 의사결정에 내장된 실물옵션의 성격을 정확하게 규명하고, 그 가치를 경제적으로 산정하는 방안이 체계화되어야 한다. 이에 본 연구는 건설 기업의 태양전지 구매 사례를 바탕으로 이 계약에 내장된 옵션을 분석하기 위한 프레임을 제시하였다. 또한, 이 상황에서 건설 기업이 취할 수 있는 두 가지 전략적 의사결정을 도출하고 이 전략이 갖는 가치 및 그 의미를 고찰하고자 하였다. 먼저 가격 상한의 성격을 규명하고 그 가치를 산정하였다. 그 다음으로 의사결정을 연기하는 전략을 취함으로써 얻을 수 있는 가치도 평가하였다

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.863-867
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• 2008

VE는 원가절감, 공기단축, 품질향상, 안전성 향상이라는 네 가지 측면을 모두 만족시킬 수 있는 최적의 방법이다. 설계VE의 중요성은 계속 부각되고 있으며, VE 업무를 효율적으로 수행할 수 있는 방법에 관한 연구가 요구된다. 따라서, 본 연구에서는 VE 업무를 효율적으로 수행할 수 있도록 도와줄 수 있는 설계VE 점검 체크리스트 개발방법을 제시하고자 한다. 체크리스트의 개발방법은 도면정보의 범주화를 통해 주요 요소들을 도출하고, 도출된 요소들을 바탕으로 체크리스트 항목을 작성한다. 작성된 항목을 바탕으로 공종별 전문가 검토를 통해 설계VE 점검 체크리스트를 개발한다.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.51-59
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• 2009

Lean construction researchers and practitioners have established a new paradigm for managing construction projects. This paradigm stems from insights gained by viewing project delivery as one kind of production and, inspired by the success of the Toyota Production System, leveraging Toyota's 'lean thinking' in the context of such one-of production. Premises of lean construction are that (1) production systems are riddled with variation, (2) variation can be good or bad, but most of it is bad, (3) most of this variation-good or bad-is self-inflicted; consequently 'lean' passionately promotes good- and relentlessly eradicates bad variation. This paper surveys a few of many lean construction means to manage variation. Lean thinking encompasses a lot more than thinking about variation, but that is the lens used here through which construction project management is viewed. Pairing these premises with lean variation-management tools may help readers broaden the insights they can gain from reading the lean construction literature.

• International Journal of Computer Science & Network Security
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• 제21권4호
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• pp.33-40
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• 2021

The traveling salesman problem (TSP) is one of the well-known and extensively studied NPC problems in combinatorial optimization. To solve it effectively and efficiently, various optimization algorithms have been developed by scientists and researchers. However, most optimization algorithms are designed based on the concept of improving route in the iterative improvement process so that the optimal solution can be finally found. In contrast, there have been relatively few algorithms to find the optimal solution using route construction mechanism. In this paper, we propose a route construction optimization algorithm to solve the symmetric TSP with the help of ratio value. The proposed algorithm starts with a set of sub-routes consisting of three cities, and then each good sub-route is enhanced step by step on both ends until feasible routes are formed. Before each subsequent expansion, a ratio value is adopted such that the good routes are retained. The experiments are conducted on a collection of benchmark symmetric TSP datasets to evaluate the algorithm. The experimental results demonstrate that the proposed algorithm produces the best-known optimal results in some cases, and performs better than some other route construction optimization algorithms in many symmetric TSP datasets.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.759-768
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• 2007

Construction is one of the most hazardous industries due to its unique nature. Recent occurrences of highly publicised and criticized construction site accidents have highlighted the immediate need for the construction industry to address safety hazards. Safety used to be addressed as an isolated issue in the past, but the problem of safety is an emergent property of a system. In general, it seems that both industrial practitioners and government officials have tended to address safety by focusing on technical aspects and looking for immediate causes of accidents after they have taken place. The objective of this paper is to examine issues and critical factors that affect the safety standards from a holistic point of view. The job of making worksites safe should not just fall squarely on the contractors but should be shared by all parties in the value chain of construction activities.

• 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.245-251
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• 2017

Integrated Project Delivery (IPD) is a procurement method that has been proved to improve construction project performance. However, in China implementation of IPD practices in construction projects is unknown though some researchers have studied the problems and constraints in adoption IPD. The purpose of this study was to explore IPD adoption in Chinese construction industry. Critical components of IPD implementation were reviewed, and questionnaires were distributed to collect industry views. The results revealed that IPD uptake is still low. In particular, the liability waiver and shared risks and rewards have been rarely used. In addition, co-location, value engineering method and the new compensation approach have also been hardly adopted. Some practices related to early involvement of key parties were adopted. Surprisingly, the findings indicate that the client has been continuously involved in the projects. The findings may imply that the legal issues and problems of contractual frameworks are still constraining IPD implementation in Chinese construction industry.