• 시스템엔지니어링학술지
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• 제11권1호
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• pp.9-24
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• 2015

Construction industry faces a lot of inherent uncertainties and issues and the construction phase of nuclear power project is not free from this risk. This paper investigates promising methodologies to be used on nuclear power plant (NPP) construction schedule delay risk assessment by using entry level systems engineering approach. This study contains how the initial concept for the risk assessment methodology has been developed. In this point of view, this work structured on three main phases: needs analysis (NA), concept exploration (CE), and concept definition (CD) through systems engineering (SE) approach. Traditionally, the SE process is applied to technical development programs but this study opens up a new avenue that SE can also be successfully applied to the development and optimization of the risk assessment model. This study provides a rational and systematic process for developing and selecting the best risk assessment model. This paper selects analytic hierarchy process (AHP) method to assess NPP construction schedule delay risk for international project. As conclusion, the proposed concept and selected method can discriminate successfully and clearly among schedule delay risk assessment methods.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.805-808
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• 2007

건설산업이 고도화되어감에 따라 클레임이 빈번히 발생하고 있으며 그 중 공기지연으로 인한 사유가 많은 비중을 차지하고 있다. 이를 해결하기 위한 방안으로 공기지연분석에 대한 다양한 연구가 진행되고 있으며 효율적인 분석을 위한 시스템 구축의 필요성이 대두되고 있다. 따라서 본 연구에서는 기초문헌조사를 통하여 공기지연 분석에 사용되는 기법들을 분석하여 개선된 방법론을 제시하고 이를 바탕으로 시스템 구축방안을 제시한다. 향후 본 연구에서 제시한 구축방안을 통하여 전산화된 시스템을 개발함으로써 복잡한 공정으로 이루어진 건설공사에서 공기지연에 따른 책임일수를 효율적으로 산정할 수 있을 것으로 예상된다.

• 한국환경과학회지
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• 제23권4호
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• pp.605-613
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• 2014

In this work, the delay time for groundwater recharge was estimated by comparing simulated recharges by means of SWAT(Soil and Water Assessment Tool) model and WTF(Water Table Fluctuation) method. The delay time for groundwater recharge means that the time when the water from rainfall travelled through vadose zone just after getting out of soil zone bottom. As measuring this delay time is almost impossible, we used to compare the estimated values from modeling(SWAT) and analytic method(WTF). The test site is Hancheon watershed which has 8 groundwater measurement stations. The results show that the altitude has a linear relationship with the estimated delay time values. To validate these results, we conducted corelation analysis between transformed groundwater levels and observed ones. The results showed that computed groundwater levels have good corelation($R^2$=0.97, 0.87, respectively). The estimated delay time would be used for the groundwater behaviour characteristics in vadose zone. As recharge rates vary according to the height, the delay time is thought to be an import variable for the proper groundwater recharge estimation.

• 한국건축시공학회지
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• 제20권6호
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• pp.527-535
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• 2020

본 연구에서는 EPC/턴키 프로젝트에서 발생 가능한 클레임의 주요 원인들을 발주자와 건설사의 관점에서 분석하였다. 그 원인들은 EPC/턴키 프로젝트의 표준 계약서인 FIDIC 실버 북을 기반으로 도출하였다. 발생 빈도가 가장 높은 클레임의 유형은 공기지연으로 분석되었다. 그 후, 가장 발생 빈도가 높은 클레임에 대한 책임이 계약 당사자간에 누구에게 있는지를 분석하는 프로세스를 제안하였다. 제안된 프로세스는 2010년에 수행한 2건의 대규모 EPC/턴키 프로젝트들과 FIDIC 실버 북의 공기지연 클레임에 관련된 계약 조항들을 기반으로 제안되었다. 제안된 프로세스는 발주자가 공사기간 지연에 대해 배상금을 설정하는지에 대한 의도에 따라 분류된다. 본 연구의 주요 기여도는 사례 프로젝트의 계약 조건을 기반으로 다양한 계약 유형에 적용할 수 있는 프로세스를 제안한 것이다. 뿐만 아니라, 계약서 작성 전에 발생 가능한 클레임의 유형을 확인할 수 있고, 공사기간 지연 클레임이 발생할 경우에 책임 당사자를 예측할 수 있으므로, 명확한 계약서 작성에도 기여할 수 있을 것이다.

• Journal of Construction Engineering and Project Management
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• 제3권4호
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• pp.35-40
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• 2013

Currently, the Kingdom of Saudi Arabia (KSA) is the epicentre of building services engineering encapsulating the construction industry. On rise of technological advancements, engineers have the ease to thoroughly investigate engineering aspects. Not only engineers, but other stakeholders, tender related people, financial analysts work in parallel as well. However, there are some factors that are stumbling blocks in the way of progression including delaying factors in the construction industry. The paper provides deep insights of delaying factors regarding public building projects of the KSA. Collection of primary data was carried out by conducting a survey which comprised of 63 chief delay factors. Professionals related to construction industry were asked for ranking the factors in terms of their frequency of occurrence and degree of impact. Seven groups of risk factors are categorized and a correlation analysis is performed by identifying the correlation amongst the variables. Finally, 31 leading delay factors are extracted and reported.

• Industrial Engineering and Management Systems
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• 제15권4호
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• pp.335-344
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• 2016

Construction project is a competitive business with high risk especially in developing countries like Iran which faces with many problems such as delay and time and costs increases. Thus, the first priority here is to determine the causes of prolongation of construction projects and to evaluate their importance. Khuzestan Steel Company (KSC) has made important contribution to the projects in Iran and in turn is required to finish them on time. In this study, an attempt was made to investigate the causes of delay in implementation of construction projects held by this company. Data was collected through questionnaire distributed among the sample including 10 owners, 10 consultants and 15 con-tractors. Accordingly, participants rated the causes in the questionnaire so the most important priorities of each area were specified using TOPSIS method. The results showed that according to the employers, consultants and contractors' viewpoints, the most important reason for delays in construction projects of KSC is related to the financial matters. Hence, according to the results obtained, causes for delays in the company's projects are largely related to the drilling permits and long administrative cycle to renew them. Besides, continuous production of steel in this company is another reason to delays of construction projects.

• Architectural research
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• 제10권1호
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• pp.41-48
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• 2008

Construction projects have frequently exceeded their schedule despite reliable estimates at the start of a project. This problem was attributed to unpredictable causes at the beginning and to shortage of proper tools to accurately predict project completion date. To supplement this difficulty, project managers need a comprehensive system that can be employed to monitor the progress of an ongoing project and to evaluate potential delay for achieving the goal on time. This paper proposed a progressive-based expert system for quantitative assessments of project delay at the early stages of the execution. Furthermore, the system is used to inspect the change of the uncertainty on completion date and its magnitude. The proposed expert system is helpful for furnishing project managers a warning signal as a project is going behind schedule and for tracking the changed uncertainty at a desired confidence level. The main objectives of this paper are to offer a new system to overcome the difficulties of conventional forecasting tools and to apply a construction project into the system to illustrate its effectiveness. This paper focuses on construction phase of project development and is intended for the use by project managers.

• 한국산업융합학회 논문집
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• 제5권4호
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• pp.329-337
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• 2002

It is the actual condition that the increasing traffic delay and accident caused by inefficient management on various construction by occupying the roadways. Since almost roadway improvements are for the public convenient, negative effects by them are ignored. But now due to the increase of traffics demand and limitation of road supply, the positive management scheme and treatment plan on the constructions must be considered. Thus, to the extent of this study divides uninterrupted flow into freeways and the Highway, yielding the time spread between under construction and not, that is delay time, we build capacity and delay model in the change of traffic volume and occupying length.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.190-191
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• 2015

Construction delays occur frequently in outrigger framework of tall buildings due to the unexpected conditions and lack of experience. However, delay factors of the outrigger framework has not been managed efficiently. Therefore, the systematic management is needed by perceiving possible delay factors before constructing management system. In this study, the major delay factors of outrigger framework are conducted to derive by using the Importance Performance Analysis(IPA). It is expected that the results of this study are utilized for planning of systematic scheduling in outrigger framework of tall building.

• 한국건설관리학회논문집
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• 제8권1호
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• pp.78-86
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• 2007

건설사업 수행에서 정해진 공사기간은 가장 중요하게 이행 및 관리되어야 하는 것으로, 공정관리를 건설사업관리의 최우선으로 두고 있으나, 최근 공공건설사업, 특히 토목사업의 대부분에서 공사기간이 연장되고 있고, 그 비용 또한 막대하여 이에 대한 시급한 대책이 요구되고 있는 실정이다. 공사기간연장에 대한 예방 및 해결의 문제는 어제오늘의 문제가 아니라 오랜 시간 동안 많은 연구를 통하여 그 문제점과 해결방안을 제시해 왔다. 그러나 문제점의 근본이 되는 공기연장사유에 대한 연구가 없었다. 이는 공기연장예방과 해결의 핵심으로서 이에 대한 구체적인 분석이 없이는 관리 및 해결방안은 형식적일 수밖에 없음은 자명하다. 사업의 특성에 따라 관련 RISK는 다르고, 연장사유 역시 사업특성에 따라 동일하지 않음이 분명한 바, 본 연구에서는 공종별 특성, 계약유형별 특성, 사업수행주체별 특성, 계약조건상의 특성 등을 비교하여 그 상이함을 도출하였고, 이는 공기연장예방 및 클레임해결과 연관하여 중점사유 대상선정, 사전적 관리 및 해결방안 도출 등의 연구에 기여할 수 있을 것이다.