• Journal of Construction Engineering and Project Management
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• 제5권1호
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• pp.20-25
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• 2015

Interface management problems inherent in construction projects hamper their successful delivery. Therefore, this study aimed at determining the most important project interfaces in construction works in Nigeria in terms of most significant potential impacts, so that management attention are objectively focused on potential highest impacting project interfaces. From a review of literature, 28 project interfaces management issues were identified and categorized. Structured questionnaires were used to collect data concerning the impact (estimated losses to the project in terms of cost) and probability of occurrence of the identified interfaces. The interfaces were ranked using their computed Matrix Scores (MS). The results reveal that "project-workers interfaces problem manifested in use of inappropriate mixes" is the highest impacting. A ranking of the interface categories also reveal that the interfaces at the execution phase of a project (MS = 1226.79) are those that could result in the highest losses to the project.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1485-1490
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• 2009

This paper discusses cases of infrastructure asset management in the U.S., Canada, and Australia and investigates infrastructure management in Korea in order to set the direction for the asset management improvement. The definitions of infrastructure asset management from various entities are introduced and implementation framework and organizational structures are described. The investigation on Korean public asset management practices finds the strong and weak points and defines the requirements and considerations to further improve the current practices. This paper will assist adopting infrastructure asset management in Korea and provide guide for the infrastructure maintenance.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.714-715
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• 2015

Drill and blast method has been most widely used in tunnel excavation, after NATM (New Austrian Tunneling Method) was introduced in 1983. The NATM method utilized mass of shotcrete to secure the bearing capacity of tunnels. Overbreak defined how much larger the actual excavation was than the planned. When it became larger, more shotcrete was required to fill in it Here, payline fixed allowable overbreak, referring to payable amounts of shotcrete. Since owner was not responsible for shotcrete exceeding payline, it was important to properly establish the standards for payline. Although the standards were provided in 'Poom-sam'(standardized quantity per unit), they did not properly reflect the actual conditions for excavation. Thus, this study reviewed existing domestic and foreign standards for overbreak, and estimated overbreak for each type of support using survey data, and finally provided the improvements on the current standards.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.956-962
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• 2009

A high embankment is generally constructed by dividing into several sub-embankments. Unlike any soil embankment, a rock embankment is constructed by means of dynamic compaction. Such a sub-embankment and dynamic compaction may induce an increase of pressure at the lower part of embankment and cause a different behavior of ground from initial status. In this study, settlement of a high rock embankment is estimated using a hyperbolic model taking into construction history. The results from prediction are compared with those obtained from field measurements and large plate loading tests.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.129-132
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• 2013

Determining on a particular construction method is typically decided in the initial phases of a project. However, changing conditions during actual construction may require a different method or technology to be employed. Providing an option for project managers to change construction provides flexibility that can increase value to the overall project. This research provides the ability to modify construction methods as a real option, which allows its value to be modeled. The research also formalizes a way to integrate a binomial lattice model with the Earned Value Method's S-curve. The integrated model provides a decision support tool that planners can use to determine whether to exercise the option depending on the status metrics provided by EVM.

• 한국건설관리학회논문집
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• 제15권4호
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• pp.20-29
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• 2014

건설 프로젝트가 대형화, 복잡화됨에 따라 건설 프로젝트에 투입되는 자재의 효과적 관리를 위하여, 바코드, RFID 등의 다양한 인식 기술의 적용이 시도되고 있다. 하지만 기존의 바코드, RFID 등의 기술의 적용은 기존 관리 업무에서 사용되지 않던 RFID 장비의 추가 투입과 부재 관리를 위한 RFID tag 부착 등의 추가 작업이 요구됨으로써, 공장 및 현장의 작업자들에게 관리 비용 증가, 추가 작업의 번거로움 등의 문제를 발생시키는 한계를 가지고 있었다. 또한 해당 장치를 인식하기 위한 별도의 RFID 리더를 소지하지 않는 경우, 해당 부재를 작업자가 해당 부재의 정보를 인식하기 어려운 한계를 가지고 있다. 따라서 본 연구에서는 Long-lead item 자재 중 철골과 PC 부재를 대상으로, 앞 서 제기된 문제점 개선을 위해 스마트 폰 등의 영상처리 기능을 이용한 문자인식 기술을 대체 기술로 제안하고, 제안된 문자인식 기술의 적용 가능성 테스트를 통해 기술의 적용가능성을 제시하였다. 또한 제안된 문자인식 기술을 보다 효과적으로 적용하기 위한 문자 표기 방식, 코드 체계를 제안하고, 기존 RFID 기반 물류 관리 프로세스와 비교를 통해 문자인식 기술이 실제 적용될 경우의 효과를 제시하였다.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.249-258
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• 2007

Recently orders of projects in the field of oil and gas plants have increased due to rising oil prices and consumption. The markets of oil and gas plants are expanding into the Middle East area and all over the world. Because the oil and gas markets have a lot of overseas construction operations, competition among advanced companies is more important. However, companies in the period of growth have not had enough competitive powers of license in the design phase. Therefore, they are faced with difficulty of adopting the technology which is maximizing the effect of investments, and scheduling of a long-range plan. In order to achieve adequate technology management and competitive power, this study considers a long-range plan through an analysis of an appropriate introduction and the strategic planning process of technology management.

• 한국고분자학회지:고분자과학과기술
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• 제5권2호
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• pp.107-114
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• 1994

• 한국건설관리학회논문집
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• 제23권2호
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• pp.24-32
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• 2022

우리나라 건설업의 생산성은 매우 낮은 수준으로 평가되고 있으며, 제4차 산업혁명의 요소 기술 활용도도 다른 산업에 비해 매우 낮은 실정이다. 이러한 문제점을 해결하기 위해 시공단계에서 직접적으로 시공을 담당하는 전문건설업의 기술 개선 수요를 파악할 필요가 있다. 따라서, 본 연구에서는 우리나라 전문건설업의 기술개선 수요를 조사, 분석하여 시공경쟁력을 향상시키기 위한 시사점을 제시하고자 한다. 이를 위해 국내 전문건설업종의 분류 개념과 현황을 파악하고 이를 기반으로 설문조사지를 구성하였다. 그리고 전문건설업 종사자를 제외한 전문가를 대상으로 조사를 실시하였으며, AHP와 클러스터링 기법을 활용하여 전문건설 업종별 기술 개선 수요에 대해서 도출하였다. 본 연구의 성과는 향후에 시공 경쟁력을 높이기 위한 정책개발과 R&D 투자방향, 그리고 기술개발 로드맵의 실질적인 참고자료가 될 것이며, 국내 건설산업의 시공 경쟁력을 향상시키기 위한 방향성을 제시하는데 도움이 될 것이다.

• Geomechanics and Engineering
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• 제27권6호
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• pp.561-571
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• 2021

Cofferdams made of teel sheet piles are commonly utilized as support structures for excavation of sea-crossing bridge foundations. As cofferdams are often subject to tide variation, it is imperative to consider potential effects of tide on stability and serviceability of sheet piles, particularly, ultralong steel sheet piles (USSPs). In this study, a real USSP cofferdam constructed using new construction technology in Nanxi River was reported. The design of key parts of USSP cofferdam in the presence of tidal action was first introduced followed by the description of entire construction technology and associated monitoring results. Subsequently, a three-dimensional finite-element model corresponding to all construction steps was established to back-analyze measured deflection of USSPs. Finally, a series of parametric studies was carried out to investigate effects of tide level, soil parameters, support stiffness and construction sequence on lateral deflection of USSPs. Monitoring results indicate that the maximum deflection during construction occurred near the riverbed. In addition, measured stress of USSPs showed that stability of USSP cofferdam strengthened as construction stages proceeded. Moreover, the numerical back-analysis demonstrated that the USSP cofferdam fulfilled the safety requirements for construction under tidal action. The maximum deflection of USSPs subject to high tide was only 13.57 mm at a depth of -4 m. Sensitivity analyses results showed that the design of USSP cofferdam system must be further improved for construction in cohesionless soils. Furthermore, the 5th strut level before concreting played an indispensable role in controlling lateral deflection of USSPs. It was also observed that pumping out water before concreting base slab could greatly simplify and benefit construction program. On the other hand, the simplification in construction procedures could induce seepage inside the cofferdam, which additionally increased the deflection of USSPs by 10 mm on average.