• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.400-408
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• 2009

Simulation applications for analyzing the productivity of construction operations at operation level and project schedules at project level are crucial methods in project management. The application at two different levels should be very tightly linked to each other in practice. However, appropriate integration at the levels is not achieved in that existing systems do not support to integrate operation models into a schedule model. This paper presents a new approach named to Discrete Event Simulation-Nesting modeling approach, which supports not only productivity analysis at operation level but also schedule management at a project level. The system developed by the authors allows creating operation models at the operation level, maintaining them in operation model library, executing sensitivity analysis to find the behaviors of the operation models when different combination of resources are used as existing DES systems do. On top of the conventional functions, the new system facilitates to find the optimum solution of resource combinations which satisfy the user's interest by computing the hourly productivity and the hourly cost of the operation. By drag-and-dropping an operation model kept in the operation model library, the operation models are integrated into an activity of the schedule model. When a complete schedule model is established by nesting operation models into the schedule model, stochastic simulation based scheduling is executed. A case study is presented to demonstrate the new simulation system and verify the validity of the system.

• 한국건설관리학회논문집
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• 제9권1호
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• pp.66-76
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• 2008

플랜트공사는 토목, 건축, 기계, 전기 공종들이 연동되어 작업이 진행되는 복합공종이다. 또한 일반 공사와 비교시 매우 짧은 공기에 대규모의 공사를 수행하여야 하는 공정상의 특징을 갖고 있다. 이러한 특성들로 인하여 플랜트공사에서 공정관리는 매우 중요한 요소가 되고 있다. 4D CAD에 의한 공정정보의 시각화는 이러한 복합공정에서 더욱 필요성을 갖게 된다. 본 연구에서는 플랜트공사의 특성을 고려한 4D CAD시스템 기능 구성방법론과 실제 시스템 개발을 시도한다. 이를 위하여 플랜트공사 현장의 공정작업 특성을 분석한 후 4D CAD 기능을 구성함으로써, 기존 시스템에서 시도되지 않은 플랜트공사에 특화된 공정시각화 기능구축을 시도하고 있다.

• 한국건축시공학회지
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• 제11권1호
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• pp.9-17
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• 2011

건설프로젝트에서 공기지연은 공정 및 공사비 관리 측면에서 핵심 관리사항에 해당된다. 본 연구는 아파트 건설공사에서 직접비의 상당부분을 차지하는 골조공사를 대상으로 공사부위별 공기지연 수준을 분석하고 대책을 제시한 실증연구로 10개 현장의 공사비 비중분석 결과에 기반하여 골조공사에서 지연이 발생하는 부위의 순위, 원인 등을 분석하였다. 분석결과 1층 골조공사에서 가장 큰 지연이 발생하는 것으로 나타났으며 지연원인을 다양한 분류에 의거하여 분석하고 대책을 제시하였다.

• 산업공학
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• 제25권2호
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• pp.216-228
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• 2012

BIM-based 4D simulation makes people easily understand complex construction process using 3D graphics model and helps them review and identify the construction schedule in each phase of the construction process. Moreover, 4D simulation can be used as reference data to determine the validity of the process in the design phase and will be utilized as a measure for checking the construction process. Therefore 4D simulation of construction improves efficiency of project management. However, current commercial applications available for 4D simulation do not provide sufficient functions for connection of 3D models and process information. In this paper, we propose an automated generation method through the definition of the process based on a work method template and developed the template based schedule generation system (TSGS).

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 추계 학술논문 발표대회
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• pp.261-264
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• 2009

Construction projects are managed by focusing on the results of projects. Moreover, cost and schedule are managed separately even though the efficiency of integrated management is very high. This paper proposes existing and progress control research of existing quantity the integrated information uses WBS-CBS. Schedule and cost are most important in construction projects. Specially, progress and cost are relationship of the managing integrated in many construction management. The quantity of materials for the works of construction is the base to create activities and a network. The quantity of materials of materials for the elemens of a building is a base of cost estimation and resource. allocation. This study suggest method for relating the schedule and cost information through the case study of construction field engineers.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.61-68
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• 2007

There has been a lot of research on and release of commercial systems that enable evaluation and visualization of construction methods. These have enabled the selection of good construction plans. However, the process in which engineers build 3D geometry, formulate a schedule and eventually synchronize them is still a time-consuming process. Changing any aspect of the geometry or the schedule and re-linking them is also time-consuming. Therefore, the engineers may compromise on getting the best solution. This paper describes a technique to automate the generation of multiple sets of schedules, quantity takeoffs and 4D visualization from a single 3D model.

• 산업경영시스템학회지
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• 제39권1호
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• pp.9-16
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• 2016

The project schedule risk in the engineering and facility construction industry is increasingly considered as important management factor because the risks in terms of schedule or deadline may significantly affect the project cost. Especially, the project-based operating companies attempt to find the best estimate of the project completion time for use at their proposals, and therefore, usually have much interest in accurate estimation of the duration of the projects. In general, the management of projects schedule risk is achieved by modeling project schedule with PERT/CPM techniques, and then performing risk assessment with simulation such as Monte-Carlo simulation method. However, since these approaches require the accumulated executional data, which are not usually available in project-based operating company, and, further, they cannot reflect various schedule constraints, which usually are met during the project execution, the project managers have difficulty in preparing for the project risks in advance of their occurrence in the project execution. As these constraints may affect time and cost which role as the crucial evaluation factors to the quality of the project result, they must be identified and described in advance of their occurrence in the project management. This paper proposes a Bayesian Net based methodology for estimating project schedule risk by identifying and enforcing the project risks and its response plan which may occur in storage tank engineering and construction project environment. First, we translated the schedule network with the project risks and its response plan into Bayesian Net. Second, we analyzed the integrated Bayesian Net and suggested an estimate of project schedule risk with simulation approach. Finally, we applied our approach to a storage tank construction project to validate its feasibility.

• 한국산학기술학회논문지
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• 제10권6호
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• pp.1281-1286
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• 2009

건설공사의 기성관리체계의 효율적인 운영을 위해, 정부는 공정과 내역의 통합관리를 위한 EVMS를 운영하고 있다. 그러나 현재 공사진도의 평가기준인 공정과 내역이 이원화로 운영되고 있어 건설공사 실무자들에게 부가적인 업무를 가중시켜 왔다. 본 연구는 공정과 내역이 통합 운영될 수 있는 일원화 방안으로 작업과업의 개념을 도입하여 공정과 내역을 공유하기 위한 정보채널로 사용하였다. 또한, 이 작업과업을 활용한 공정 내역 통합관리시스템의 모형제시 및 활용성 검증을 통하여 EVMS 운영 시스템 프로토타입을 개발하여 그 효율성을 제시하였다.

• 한국건설관리학회논문집
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• 제1권4호
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• pp.82-90
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• 2000

낙후된 국내 건설관리기술을 선진화$\cdot$합리화하기 위한 방안 중의 하나로 공정-공사비 통합관리가 많은 주목을 받고 있다. 정부에서도 공정과 공사비의 통합관리의 필요성을 인식하고 이의 도입을 적극검토하고 있다 실제로 해외공사를 통해서 양성된 국내 공정관리 전문가들의 노력으로 최근 일부 공공기관의 건설사업에서는 공정-공사비 통합관리를 부분적으로 활용하고 있는 상황이다. 그러나 그 기법 및 전산모델이 이론에 국한된 것이거나 국내의 특수한 여건을 수용하지 못하는 것이 대부분이기 때문에 활용에 많은 어려움이 있으며 국내 건설환경에 완전하게 정착되지 못하고 있다. 본 연구의 목적은 통합관리의 정착을 지연시키는 국내의 특수한 여건 및 문제점을 파악하고 이를 토대로 국내 건설현장에서 적용할 수 있도록 공정-공사비 통합모델의 개선방안을 제시하는 것이다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.459-466
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• 2013

Risk exists in all construction projects and resides among the collection of subcontractors and their array of individual activities. Wherever risk resides, the interrelation of participants to one another becomes paramount for the way in which risk is measured. Inherent risk becomes recognizable and quantifiable within network schedules in the form of consuming float - the flexibility to absorb delays. Allocating, owning, valuing, and expending such float in network schedules has been debated since the inception of the critical path method itself. This research investigates the foundational element of a three-part approach that examines how float can be traded as a commodity, a concept whose promise remains unfulfilled for lack of a holistic approach. The Capital Asset Pricing Model (CAPM) of financial portfolio theory, which describes the relationship between risk and expected return of individual stocks, is explored as an analogy to quantify the inherent risk of the participants in construction projects. The inherent relationship between them and their impact on overall schedule performance, defined as schedule risk -the likelihood of failing to meet schedule plans and the effect of such failure, is matched with the use of CAPM's beta component - the risk correlation measure of an individual stock to that of the entire market - to determine parallels with respect to the inner workings and risks represented by each entity or activity within a schedule. This correlation is the initial theoretical extension that is required to identify where risk resides within construction projects, allocate and commoditize it, and achieve actual tradability.