• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.718-721
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• 2007

Construction schedule plays a key role in project management due to its influence on the project success. Thus, it is important to identify factors affecting construction delay. The major objective of this study is to identify and evaluate factors affecting construction delay in apartment projects in Vietnam. The findings confirmed that financial difficulties of owners and contractors, contractors without adequate experience, non-available materials on time, slow site clearance, inappropriate construction methods, defective works and reworks, and lack of capable owners/project managers are the major causes of delay in apartment projects.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.268-270
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• 2006

The purpose of this paper was to explore delay avoiding measures and strategies. The paper was based on previous work of authors on finding delay causes. Firstly, the paper has discussed about delay avoidance measures prescribed by the previous work. As the previous study identified five main causes of construction delays, various measures and strategies to overcome those delay problems have been discussed in sequence in the last sections. Major delay prevention strategies are: involving stakeholders in the project decisions, outreach program, realistic time and resource estimation, try to adjust the triple constraints of time, cost and scope, ensure fair and complete disclosure of information at an early stage of the construction project, contractor, itself should inquire about patent design errors prior to submitting its bid, owner should include in its contract with the consultant an indemnity (protection) clause etc.

• 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.

• Journal of Construction Engineering and Project Management
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• 제4권3호
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• pp.33-46
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• 2014

Delay is the most common problem in the construction industry. It has many negative effects on project's success in terms of time, cost, quality, and safety. From the literature review, a total of thirty-five factors of delay were selected. These factors were divided into seven groups related to materials, manpower, owner, consultant, contractor, construction, and external problems. This study was carried out to identify the main causes of delay for a construction project through their importance level. The importance level was determined based on the frequency of occurrence and severity of impact. The structured questionnaire has distributed to the respondents who have much experience in construction management in Bangladesh. The results of analysis indicated that top five factors of construction delay according to their level of importance are: (1) price of construction materials increased very rapidly, (2) political situation (revolution/ public strikes), (3) shortages of skilled workers, (4) poor site management and supervision by contractor, (5) incompetent/ immature subcontractors. These findings of this study are expected to be significant contributions to Bangladesh construction industry in controlling current performance of project on time overrun.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.157-160
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• 2003

In order to reduce the construction cost and period without degrading the quality, construction companies are making a lot of efforts to prefabricate and mechanize the construction process, and introducing and utilizing various techniques of construction time management in the process of construction. However, due to the various factors (such as weather conditions, labor factors, supply of equipment and materials, safety accident, etc) in the process of construction, construction projects are not frequently completed within the scheduled Period. This research is to examine the current status of construction time management and factors causing delay in construction with regard to the concrete work (such as form work, steel reinforcement, and concrete work) in building apartments.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.426-429
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• 2003

건설공사는 프로젝트의 진행 중 내${\cdot}$외부의 여러 조건의 변경이나 사회적 요구에 따라 초기의 계약과는 다른 많은 변경사항이 발생하게 된다. 이러한 변경사항은 프로젝트 추진과정에서 많은 영향을 미치게 되며, 이로 인하여 발생되는 영향은 대부분 프로젝트의 공기지연으로 나타나게 된다. 건설공사에서 발생하는 공기 지연은 기본적으로 도급자의 면책여부에 따라 공기연장이나 지체상금의 부과 등의 결과로 나타나게 되는데 이러한 사항에 대한 발주자와 도급자의 의견이 대립될 경우 클레임으로 발전하게 된다. 클레임에서 가장 중요한 사항은 공기지연일수의 산정으로서 이는 공기지연 클레임에서 가장 중요한 부분이라고 할 수 있다. 본 연구에서는 공기지연 클레임에서 가장 중요한 자료가 되는 공기지연일수 산정방법의 한 방법으로 계약 초기에 작성된 계획공정표(As-Planned Schedule)와 모든 지연이 포함된 준공공정표(As-Built Schedule including all delays) 그리고 발주자 지연이 제외된 준공공정표(As-Built schedule absent owner delays)를 비교함으로써 각 계약 구성원의 귀책으로 인한 광기 지연일수 산정방법을 제시하고자 한다.

• 한국건설관리학회논문집
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• 제12권6호
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• pp.31-41
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• 2011

최근 공공공사에서 공기지연은 지속적으로 발생하고 있으나 책임 미 이행으로 인하여 당사자의 손해 발생은 물론 클레임 및 분쟁으로 비화될 가능성이 점차 커지고 있다. 이는 현행 공정관리가 책임구분이 불가능한 문제점을 내포하고 있어 공기지연이 반복적으로 발생되며, 당사자의 책임이행도 불가능하게 만들고 있기 때문이다. 따라서 공기지연의 반복적 발생을 예방하고 공기지연에 대한 당사자의 능동적 책임이행을 위하여 책임구분이 가능한 공기지연관리 방안의 마련이 매우 필요한 실정이다. 이러한 관점에서 본 연구는 건설현장에서 쉽게 활용할 수 있는 지연사유에 대한 사전적 관리 개념을 도입한 공기지연 사유 관리 모델을 제시하였다. 제시한 모델은 첫째, Cell 개념의 사유 세분화 및 계층화를 통한 사유의 근본 원인을 파악하기 용이하게 하였으며, 둘째, 발주자, 시공자, 제3자로 업무 수행 절차를 구분함으로써 지연사유를 명확하게 구분할 수 있게 하였다. 셋째, Matching 시스템을 통한 사유, 일수 및 해당근거를 연계함으로써 클레임에 대한 명확성을 제시할 수 있도록 하였다.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.520-529
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• 2007

Apportioning responsibilities of concurrent delay to the owner and the contractor is a difficult task, due to the sophisticate nature both in the schedule and in the factors that cause the delay. This research attempts to develop a simplified yet systematic approach that can be used for a fair apportionment of concurrent delay. A concurrent delay is defined herein as when the contractor and the owner have both caused independent critical path delays during the same approximate time period. Incorporating the concepts of windows analysis and critical path method (CPM), the developed approach has three "windowing of delay" steps to quickly apportion the delay in each of these windows, and a fourth step to sum up those apportioned delays to obtain each party's final responsibilities. This developed approach is found to be simple and effective at this stage; it will be tested against real cases in the near future.

• 한국산업융합학회 논문집
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• 제6권2호
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• pp.131-139
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• 2003

The links operating interrupted flow are intend to yield the traffic between the out flow and inflow part effect zone of street section, we build the delay model using the time gap between under construction and not. We review the applicability of interrupted flow, and thus we can put this data to practical use as the basis data to compute the inducement charge for traffic delay. Also building about traffic effect zone of interrupted flow wouldn't produce at the section beside occupying roads and construction cross section, thus we must review the plan to minimize traffic delay by the construction occupying road. In future there must be advanced the incomplete in this study, and groping for the various alternatives to minimize the traffic delay by the road occupying construction, with developing the various sets of detailed analyzing models, that is analysis on the street strength, crossroads geometrical forms of crossroads, public traffics, pedestrians, occupying types.

• 한국건설관리학회논문집
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• 제7권5호
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• pp.177-190
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• 2006

Construction projects are facing delay problems. Delays in construction have been immense effect on performance or satisfactory delivery of the project. Delays have been causing project cost overrun as well as it is a source of dispute hence damaging the relationship between the project participants. The purpose of this study was to explore the causes of delay risk through a field survey study. Data were collected from construction professionals working in owner, consultant and contractor organizations. All together 208 questionnaire instruments were used and analyzed by employing statistical tools (SPSS computer program). 19 delay factors were identified by this study, out of which following factors were critical: Frequent interruptions from public (local people, pressure group etc.), changed site condition, failure to provide required construction site, unrealistic project time estimation and design errors.