• 국제학술발표논문집
• /
• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
• /
• pp.534-541
• /
• 2011

Risk evaluation approaches for bidding on international construction projects are typically partitioned into three stages: country selection, project classification, and bid-cost evaluation. However, previous studies are frequently under attack in that they have several crucial limitations: 1) a dearth of studies about country selection risk tailored for the overseas construction market at a corporate level; 2) no consideration of uncertainties for input variable per se; 3) less probabilistic approaches in estimating a range of cost variance; and 4) less inclusion of covariance impacts. This study thus suggests a three-staged risk evaluation model to resolve these inherent problems. In the first stage, a country portfolio model that maximizes the expected construction market growth rate and profit rate while decreasing market uncertainty is formulated using multi-objective genetic analysis. Following this, probabilistic approaches for screening bad projects are suggested through applying various data mining methods such as discriminant logistic regression, neural network, C5.0, and support vector machine. For the last stage, the cost overrun prediction model is simulated for determining a reasonable bid cost, while considering non-parametric distribution, effects of systematic risks, and the firm's specific capability accrued in a given country. Through the three consecutive models, this study verifies that international construction risk can be allocated, reduced, and projected to some degree, thereby contributing to sustaining stable profits and revenues in both the short-term and the long-term perspective.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 1991년도 가을 학술발표회 논문집
• /
• pp.115-120
• /
• 1991

At the preliminary design stage, the orientations of laminae in a laminate are not known. This fact discourages the most of engineers from the beginning. If the quasi-isotropic constants are used, it halps the design engineer greatly to start his work. If conventional mechanics and elasticity theories can be used, the effort for design and analysis is greatly reduced. This paper reports the possibility of using the classical mechanics at the preliminary design stage for the laminated composite primary structure for civil construction. The result is quite promissing.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
• /
• pp.133-138
• /
• 2003

Axial shortenings of wall and columns were measured on level 2 and precise leveling between wall and columns were surveyed on level 5 at the Galleria Palace structure. Measured and surveyed shortening values were compared with the analysis results at the earlier stage on the process of construction for evaluating the predicted values. Though measured values represent relatively low and scattered values at earlier construction stage, probably they show similar slope curves to predicted ones with the progress of time.

• 국제학술발표논문집
• /
• The 2th International Conference on Construction Engineering and Project Management
• /
• pp.777-786
• /
• 2007

This paper presents a modified simulated annealing algorithm to optimize linear scheduling projects with multiple resource constraints and its effectiveness is verified with a proposed problem. A two-stage solution-finding procedure is used to model the problem. Then the simulated annealing and the modified simulated annealing are compared in the same condition. The comparison results and the reasons of improvement by the modified simulated annealing are presented at the end.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2003년도 학술대회지
• /
• pp.120-125
• /
• 2003

기획단계에서의 예상 공사비 추정은 사업성 자체를 판단하는 중요한 자료로써 활용된다. 그러므로 사업주는 보다 정확한 금액자료의 산출을 기대하는데 이를 위해서 세계적으로 Cost 전문가들의 많은 연구검토가 있어 왔으나 아직 국내의 적산사는 주로 물량산출 및 상세 견적업무에만 매달려 있는 실정이다. 본 논문은 요소별/기능 부위별 비용의 분석을 통한 Database를 활용하여 개산견적의 결과물을 보다 정확하게 만든 사례의 소개를 통해 국내 개산견적 실무에 일조하고자 한다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
• /
• pp.271-272
• /
• 2018

As the supply and demand of natural aggregate becomes more difficult in the domestic construction site continuously, many studies related to the recycled aggregate produced in the construction waste are going on. However, because of the safety and performance of the recycled aggregate, it is not used as aggregate for the structure, and it is mainly used as a nonstructural material. In addition, as the "recycled aggregate quality standard" has been revised in 2017, quality standards for various properties of recycled aggregate have been adjusted, and production technology suitable for recycled aggregate quality standards for concrete is needed. In this study, to improve the quality of recycled aggregate, we applied multistage wind pressure treatment method to the existing recycled aggregate production facility and compared the density, absorption rate, particle size before and after recycled aggregate treatment. As a result, quality criteria in various properties were analyzed satisfactorily.

• Earthquakes and Structures
• /
• 제20권3호
• /
• pp.309-323
• /
• 2021

Architectural design decisions and structural systems arrangements affect their earthquake behaviors significantly of reinforced concrete building in Turkey. Because the performances as safe and economical against earthquake loads of reinforced concrete buildings can be provided with especially design decisions in the architectural design stage. This matter reveals the importance of design decisions in the architectural design phase and the right structural system arrangement. The purpose of this study, the short-column situation frequently observed in reinforced concrete buildings after the earthquakes occurred in Turkey are to examine comparatively the effects on behavior and the rough construction cost of the building. The obtained results show that the short column circumstance composed due to different reasons negatively affects the earthquake performance of the reinforced concrete buildings and increases the rough construction cost. This matter shows that the measures to be taken against short column formation should be foreseen especially at the architectural design stage.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2021년도 가을 학술논문 발표대회
• /
• pp.244-245
• /
• 2021

Design VE (Value Engineering) has been basic design and implementation design separately, but due to the recent change in guidelines, it is changing to implement only once in the implementation design stage. However, in the implementation design stage, construction costs, plans, and specifications based on the volume details are almost completed. Therefore, it is effective to perform the function analysis step after identifying information analysis and key issues through CostModeling based on functional center for the selected target in the process of implementing the VE performance procedure.

• 한국재난정보학회 논문집
• /
• 제9권2호
• /
• pp.195-205
• /
• 2013

건설공정관리는 주어진 공기 내에 공사를 완료하기 위해 투입되는 자원과 요소작업들의 종합적인 계획을 말한다. 이중 공사기간의 산정은 사업초기 신뢰할만한 근거에 의해 결정되어야 한다. 그러나 실제 현장에서는 담당자의 직관적 판단, 과거 유사 프로젝트의 공기 참고 등의 부정확한 방법으로 개별 작업기간이 결정되고 있다. 이러한 기존 방식의 개선을 위한 선행연구로 본 연구는 TBM공법 $({\phi}2.6m,\;{\phi}3.0m,\;{\phi}3.5m,\;{\phi}5.0m,\;{\phi}8.0m)$ 운영을 위한 건설사업의 초기단계에서 활용할 수 있는 표준모델을 제시하여 신속하게 전체 개략공기를 추정할 수 있는 공기를 산정하여 제시하였다. 따라서 본 연구에서 TBM 구경별로 분석하여 제시한 총 공사기간은 향후 TBM 공사를 수행할 때, 기본계획단계와 기본설계단계에서 공사계약, 공사비 산정, 공정계획을 수립하고 관리하는데 유용한 자료가 될 것으로 확신한다.

• 한국건설관리학회논문집
• /
• 제19권4호
• /
• pp.82-92
• /
• 2018

건설사업 초기단계가 환경부하량의 절감 가능성에 큰 영향을 미친다는 것을 감안한다면, 효과적인 의사결정을 지원할 수 있는 시스템을 초기에 구축하고 활용하는 것이 중요하다. 이에 본 연구에서는 기본적인 설계 요인들을 고려하여 초기 설계단계에서 활용될 수 있는 환경부하량 산정 모델을 구축하였다. 이 모델은 인공신경망 기법을 활용하고 설계단계 업무가 진행됨에 따라 얻을 수 있는 가용정보 수준을 고려하여 기획단계 적용 모델(ANN-1)과 기본 설계단계 적용 모델(ANN-2)로 구분하여 환경부하량을 산정하도록 구축되었다. 모델의 실험결과 ANN-1, ANN-2모델의 절대평균오차율과 표준편차는 각각 11.19% / 5.30% 및 9.59% / 3.09%로 높은 신뢰성을 갖는 것으로 나타났다. 본 모델은 프로젝트 초기단계별 기초적인 가용정보만을 활용하여 신속하고 정확하게 환경부하량을 추정하고 합리적인 의사결정을 지원할 수 있을 것으로 기대된다.