• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.107-110
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• 2013

Recently, Korea parliament legislated the Low Carbon Green Growth Act (April, 2012) and approved a bill (May, 2012) to start carbon emission trading system in 2015. It means that for the first time, government would regulate the amounts of carbon emission in private entities, and private entities should attain predefined emission reduction goals by implementing clean development mechanism (CDM) project or buy the Certified Emission Reductions (CERs) from the trading market to avoid penalty. Under these circumstances, it is not easy for them to determine when or how to implement the CDM project because the governmental energy policies about the level of governmental subsidies, periods for free emission allocation, etc. are still under discussion and the future price of the CERs is quite uncertain. Thus, this study presents a real-option based model to assess the financial viability of the CDM project which switches bunker-C oil to liquefied natural gas (LNG). The proposed model is expected to assist private entities in establishing the investment strategy for CDM project under uncertain government energy policies.

• Journal of Construction Engineering and Project Management
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• 제4권3호
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• pp.13-20
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• 2014

Estimating time and cost is an important mission in the early phase of a construction project, especially in feasibility study. It provides a foundation for making decision whether or not the project is performed on schedule and within budget. Thus, reliability of this estimate plays a key role in measuring the success of a project. This study was carried out to investigate the time-cost relationship in building construction projects in Bangladesh. The mathematical equation used in this study is based on Bromilow's equation. The research data were collected from sixty-three completed building projects through questionnaire survey. Type of clients, type of projects, and tender methods are the project characteristics considered in this study. The results of analysis indicated that the Bromilow's time-cost (BTC) models developed for each project characteristic are appropriate due to quite high coefficient of determination and relatively small mean percent errors. Among them, the forecasted model for time and cost according to tender methods is the best fit model. It is concluded that the BTC model could be applied in building construction project to predict its time and cost in Bangladesh. Four different regression models were also developed in this study. The results of BTC model between some selected countries were compared to gain the comprehensive view.

• Wind and Structures
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• 제26권2호
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• pp.69-74
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• 2018

Nowadays, using math logic in great civil projects is considered by the clients to achieve the goals of project including quality optimization, costs, avoiding individual, emotional and political decision making, long-term and short-term goals and they are the main requirements of each project and should be considered by the decision makers to avoid the illogical decision making applied on the majority of civil projects and this imposes great financial and spiritual costs on our country. The present study attempts to present one of the civil projects (Ghasre Shirin storage dam) whose client was not ministry of energy for the first time and the short-term and long-term goals of the private sector were applied based on the triangle of quality, cost and time. Also, the math logic and model (multi-criteria decision making method and decision making matrix) is used in one of the most important sections of project, sealing element, policies and new materials (Geosynthetics) are considered and this leads to suitable decision making in this regard. It is worth to mention that this method is used for other sections of a dam including body, water diversion system, diaphragm and other sectors or in other civil projects of building, road construction, etc.

• 한국건설관리학회논문집
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• 제18권2호
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• pp.99-107
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• 2017

최근 들어 국내기업의 해외 엔지니어링 사업에 진출이 활발해지고 있다. 해외 엔지니어링 사업은 고부가가치 사업으로 EPC 건설사업에 비해 리스크가 적은 것으로 알려져 있지만, 국내기업의 해외 엔지니어링 매출수익은 그만큼 좋지는 않은 것으로 나타났다. 따라서, 본 연구에서는 해외엔지니어링 사업에서 많이 발생하는 리스크를 수주 전과 수주 후로 나누어서 분석하였다. 또한, 대상사업을 총액계약방식과 실비정산계약방식으로 나누어 계약방식에 따라 여러 가지 리스크의 차이점을 보여주었다. 마지막으로, 토목공종과 건축공종으로 나누어 리스크 차이를 분석하였다. 해외 엔지니어링 사업에서 발생하는 리스크를 다양한 각도로 분석한 본 연구는 산업체에게는 리스크 분석을 좀 더 실무적으로 참조할 수 있게 해주고, 학계에는 향후 좀 더 집중해서 연구해야할 엔지니어링 리스크 분야의 방향성을 제시해주는데 도움을 준다.

• 한국건설관리학회논문집
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• 제15권2호
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• pp.79-86
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• 2014

최근 건설공사는 여러 프로젝트가 모여 구성된 프로그램 단위의 건설 발주가 출현하는 등 사업규모가 대형화되고, 복잡해지고 있다. 특히 신도시건설사업 발주의 경우 체계적인 사업계획 수립에 의해 관리업무가 수행되어야 하며, 성공적인 사업의 완수를 위해서는 다양한 사업 주체 및 대내외 환경변화에 따른 변화관리 업무수행이 반드시 필요하다. 이에 본 연구에서는 체계적인 변화관리를 위해 사업계획 수립, 변화요인 발굴, 시뮬레이션 분석 및 사업계획 재수립의 체계를 제시하여 변화관리를 위한 프로세스를 도출하였다. 또한 보다 효율적인 업무 수행을 위해 변화관리시스템을 구축하고 이를 실제 진행 중인 신도시건설 사업관리에 적용하여 그 적용성과 효용성을 분석하는 연구를 수행하였다.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.729-738
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• 2007

The Public Private Partnership/Private Finance Initiative (PPP/PFI) schemes have made the private sector become a major participant involved in the development of infrastructure systems along with the government. Due to more integrated efforts among project participants and longer concession period, PPP/PFI projects are inherently more complex and risky. It is therefore very important to proactively manage the risks involved throughout the project life cycle. Conventional risk management strategies sometimes ignore managerial flexibility in the planning and execution process. This paper starts with a revised risk management framework which incorporates the real option concept. Following the presentation of the framework, a new risk classification is proposed which leads to different ways of structuring options in a project according to the stage of the project life cycle. Finally, the paper closes by discussing other issues concerning option modeling and negotiation.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.111-113
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• 2015

Floats are used by the parties involved in a construction project. The owner may use float by changing order(s) or by executing risk avoidance plan; the contractor may use it for leveling resources or substituting activities' construction methods to reduce costs. Floats are accepted either just as by-product obtained by critical path method(CPM) scheduling or as asset having significant value. Succinctly, existing studies involved in float value does not consider its' changes on project time domain. It is important to identify float ownership and to quantify its' corresponding values. This paper presents a method that quantifies float value of money that changes over project execution. The method which accurately computes the monetary value of float may contributes to resolve conflicts relative to float ownership and/or delay issues among project participants. It compares the difference between the monetary value of total float - on non-critical path in each and every schedule update. It makes use of critical path method (CPM) and commercial software with which practitioners are already familiar.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.1036-1041
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• 2005

Treemaps, a space filling visualization technique, displays a massive data set of hierarchical data interactively on a single computer screen by mapping it to a matrix of rectangles. It allows users to visually inspect and manipulate data to find new relationships or discrepancies that are to difficult to find using traditional techniques. This paper applies treemaps to the evaluation of highway project bids, which contain hundreds or thousands of elements arranged in a hierarchical structure. Through a case study, treemaps are shown to be a potentially effective tool for bid evaluation by both contractors and State or Federal highway officials.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.18-24
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• 2022

State highway agencies (SHAs) typically apply a competitive procurement procedure to select contractors for their design-bid-build projects. Since the level of competition affects construction bid prices and project outcomes, the Federal Highway Agency (FHWA) suggests SHAs seek ways to improve competition among contractors continuously. However, they rarely conduct an empirical assessment of the current competition level necessary to identify room for improvement. Besides the number of bidders on a project, other factors such as winning or losing rates among the contractors in previous projects can also indicate the degree of competition; only a few contractors may have won the majority of the projects in a specific region. However, few studies have investigated such factors. This paper proposes a network analysis-based approach to evaluating contractor competition levels of highway projects using historical bid tabulation data. The proposed method provides insights into overall competition levels, the determination of competitive contractors, and winning rate distribution among contractors.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.886-892
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• 2022

In construction projects, it is common to exchange documents using email because of convenience. In this study, a method extracting and organizing block information automatically based on email was developed. This method is composed of document exchange and archiving processes, which are difficult to manage and vulnerable to loss. Therefore, this study aims to develop a solution that can automatically link email and block information. The block data components are designed to derive from email exchange and user-additional input information. Also, automatically generating blocks process including extraction and conversion of information was proposed. This solution can lead to promote the convenience of project document management in terms of identifying the document flow and preventing loss of information.