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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Construction Engineering and Management
Journal Basic Information
Journal DOI :
Korean Institute Of Construction Engineering and Management
Editor in Chief :
Volume & Issues
Volume 6, Issue 6 - Dec 2005
Volume 6, Issue 5 - Oct 2005
Volume 6, Issue 4 - Aug 2005
Volume 6, Issue 3 - Jun 2005
Volume 6, Issue 2 - Apr 2005
Volume 6, Issue 1 - Feb 2005
Selecting the target year
Classify and Quantify Cumulative Impact of Change Orders On Productivity Using ANN Models
Lee, Min-Jae ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 69~77
Change is inevitable and is a reality of construction projects. Most construction contracts include change clauses and allowing contractors an equitable adjustment to the contract price and duration caused by change. However, the actions of a contractor can cause a loss of productivity and furthermore can result in disruption of the whole project because of a cumulative or ripple effect. Because of its complicated nature, it becomes a complex issue to determine the cumulative impact (ripple effect) caused by single or multiple change orders. Furthermore, owners and contractors do not always agree on the adjusted contract price for the cumulative Impact of the changes. A number of studies have attempted to quantify the impact of change orders on project costs and schedule. Many of these attempted to develop regression models to quantify the loss. However, regression analysis has shortcomings in dealing with many qualitative or noisy input data. This study develops ANN models to classify and quantify the labor productivity losses that are caused by the cumulative impact of change orders. The results skew that ANN models give significantly improved performance compared to traditional statistical models.
The Maintenance Performance Evaluation Dynamic Model for Apartment Buildings
Kim, Tae-Hui ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 78~88
Given the trend of increased apartment buildings and high-rise buildings, the maintenance of apartment buildings has been set a higher value. For this reason, a total performance evaluation model of the existing buildings has recently been developed. But, it has a lack of the management work analysis. The purpose of this study, therefore, is the management work analysis for items selection of maintenance performance evaluation of apartment buildings. Candidate items of Maintenance performance evaluation was made with the existing literature and business system analysis. Easy systemicity of performance evaluation supplemented doing question to academic experts and housing managers. Finally decided maintenance performance evaluation items are to classify 14 administrative and 15 technical items.
A Study on the Theory and its Case Study of Production Design - Focused on the Japanese Construction Projects -
Kim, Jin-Ho ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 89~101
The early phase of construction projects, communication among the related participants has great influence on the further transaction of the projects. However, important decision making are made by the experience of the field managers in practice without the method for systematic analysis. For example, in building construction project, selection process for construction method has been executed by decision making of some architects dependent on their experience. As a result, there have been frequent construction method alterations during the construction process and delay of duration, addition of cost, etc have followed accordingly. The main reasons of such a mal-functional transaction are due to the absent of the reasonal procedure of decision making reflecting the characteristics of construction project. Therefore, there is a need for an supporting tool and production design for the selection of rational construction method. The objective of this study is to propose production design process and decision making model in relation to various influent factors at the early phase of construction projects. To achieve these objectives, this study 1)analyzes the prior theory about production design, 2)we have studied about selection process for optimal construction method through constraint analysis in structural works, 3)performs a case study to embody the problems of the production design, and 4)proposes a cooperative committee model for supporting production design by analyzing the results of case study and interviewing experts. It is anticipated that the effective tool of proposed model would be able to improve communication among the related participants and systematically accumulate data that might be used in similar construction projects.
Identifying Factors Causing Bid-dropping in Domestic Public Work Projects and Ways of Ending Its Decline
Lee, Bok-Nam ; Lee, Young-Hwan ; Chang, Chul-Ki ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 102~109
The contract price of successful bidders in domestic public work projects has dropped significantly under lowest bidding process. Furthermore, compared to the U.S. and Japan, the bids are substantially lower. The increasing trend for domestic construction companies to bid projects without considering markup or expected profit, with the purpose of gaining experience for future similar work, has contributed to the overall dumping in bid prices. The government has implemented controls in hopes of reducing the price dropping trend but these have yet to work in the market. This study determines the level of significance of the contract price of the successful bidder in domestic public works projects and identifies factors that cause bid-dropping by comparing to those of the US and Japan. By mirroring advance countries' rules and regulations to prevent an abnormally low bidder, recommendation are provided to keep unrealistically low bidders from winning the work.
Identifying Criteria for Feasibility Study of Housing Development Projects
Shin, Woo-Shik ; Park, Keun-Joon ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 110~118
This paper examines the method of evaluation for feasibility study factors on housing development projects which can assist project managers to asses potential sources of risk. The aim is to reduce uncertainty on the project objectives. The major initial goals for a feasibility analysis are to define a limited set of key related factors which apply to housing development project according to development and market environment, condition of project planning and economics. Thus, in order to construct types of factors related with the feasibility, the research executes Delphi Method subjected personnel in the task to explore housing development projects. Such exploration provide the information for Importance Index, Extra Weight and the Mean of Extra Weight that is used for constituting confines of factors related with a feasibility analysis.
Schedule Risk Management of Reinforced Concrete Construction at the Preconstruction Phase
Ryu, Han-Guk ; Kim, Sun-Kuk ; Lee, Hyun-Soo ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 119~127
According to the recent systemic changes such as construction market reduction, five days per week system, introduction of construction duration reduction bidding system and post-construction sale system, the bidding competition have been enhanced. However, there are many construction schedule risks which could delay construction completion. Without the proper identification of construction schedule risks and the structured construction schedule risk management, the competitive advantages of construction project could not be made. Previous researches to solve the problem have been focused on the construction schedule categorization, construction schedule management, and the system development to manage the construction schedule risk. Therefore, this study selected the reinforeced concrete construction as the studied work due to the major impact characteristics on the total construction duration and the quite accident rate, and then proposed the real construction schedule risks of reinforced concrete construction and the construction risk management method based on the previous studies, many times of expert interviews and brainstorming.
Ex Ante Expectations & Ex Post Operating Performances of Mergers and Acquisitions of the Korean and U.S. Construction Industry
Choi, Jong-Soo ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 128~138
The success of mergers and acquisitions(M&A) have been evaluated by either measuring ex ante expectations for the specified time period(Window) or assessing long term-based post operating performance (ex post operating performance). In this study, utilizing cumulative abnormal return(CAR) method, M&As which are observed in both domestic and U.S. construction industries were analyzed then research outcomes are compared. Analysis results indicate that stockholders of public construction companies did not realize significant economic gains from M&As. In other words, there was no synergistic gains from the construction M&As. Also, no significant performance difference was observed between related and unrelated diversifications.
On-Site Manpower Increasing Impact on Labor Productivity
Chang, Chul-Ki ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 139~147
During a typical construction project, a contractor nay often find that the time originally available or normally expected to perform its work has been severely reduced. To finish the project by the completion date, the contractor is forced to find a way to speed up the progress of its work to compensate for the reduction in available time. The most frequent initial reaction of contractors to this situation is to increase on-site manpower by working longer time (overtime), adding more workers (overmanning), or implementing shift work (shift work) to increase the rate of progress. The goals of this study were to investigate how these three methods affect labor productivity and to quantify their impact on labor productivity by analyzing real project data collected from sheet metal contractors and mechanical contractors in the US.
A Safety Management Activity Improvement in Construction Sites through Analysis of Success Factors
Hong, Jung-Suk ; Bae, Dae-Kwon ; Kim, Jae-Jun ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 148~156
By reviewing the existing researches of construction safety management, this study presented some problems; 1) preceding researches dealt only a formal system of safety management and did not focus on the practical safety management action, 2) there is an insufficient endeavor of utilizing the lessons teamed of successful construction sites and generalizing the success factors of safety management in the construction industry. The objective of this study is to propose and describe an effective construction safety management activity improvement reflecting success factors of the excellent construction cases and the preceding researches. To achieve this objective, the authors performed a case study of successful construction sites and proposed the major six safety activities. The author's point are illustrated through an explanation of the safety management activity improvement.
Guidelines for Provisional Sum in Public Construction Projects
Lee, Jae-Seob ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 157~165
Recently, the term 'Provisional Sum(PS)' has been used in domestic public construction projects especially for civil works. Nevertheless, the guideline for PS has not been clearly stipulated in contract documents or construction-related laws. Due to these ambiguous contract situations, disputes between owners and contractors are surely expected to settle down PS in construction projects. This paper focused on suggesting a guideline to settle down PS in these ambiguous contract situations. The guideline suggested in the paper is expected to be used as a reasonable method to settle down PS avoiding nonproductive disputes about PS in construction projects
Strategic Action Plan for Construction Knowledge Management
Jung, Young-Soo ; Kang, Seung-Hee ; Lee, Kyoo-Hyun ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 166~176
The purpose of this paper is to develop a framework for construction knowledge management. Three variables of proposed framework includes knowledge class, strategic business function, and engineering data form. Several different techniques for evaluating the variables are developed in order to develop a strategic action plan for engineering knowledge management systems. The proposed framework for an action plan will contribute to develop knowledge management systems related to strategic engineering functions for construction companies.
Risk Mitigation Methodology of the General Conditions of Contract
Yoon, Chul-Sung ; Kwon, Soon-O ; Kim, Seon-Gyoo ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 177~185
Construction uncertainties are frequently exposed to the claims. In most cases, an interpretation of the claims is based on the construction contract. Therefore, the key points of contract negotiation are how to fairly distribute the contract risks to the client and contractor. For these, a FIDIC that is considered as an international standard contract form would be a good reference to decide reasonable contract risk distribution. In order to find out any unreasonable and unfair contract clauses at the general conditions of contract applying generally to public construction project in Korea, this study surveys, analyses and evaluates the general conditions of contract based on a FIDIC, and then proposes a risk mitigation methodology to response those clauses' risk factors reasonably.
The Fact-finding and Analysis of the Environmental Management Cost in Construction Projects
Choi, Min-Soo ; Kang, Woon-San ;
Korean Journal of Construction Engineering and Management, volume 6, issue 5, 2005, Pages 186~192
The purpose of this study is to find the reality of environmental management cost in construction projects and to suggest some policies in order that owners appropriate the environmental management cost reasonably in the construction budget for reducing the environmental pollution at job sites. We surveyed the actual state of appropriating and expending the environmental management cost over 122 construction sites. According to the results of the survey, while the appropriated rate of the environmental management cost was 0.59% of the total construction cost. the expended rate reached at 0.94%. When examining the antipollution facilities which were operated in job sites, the investment for equipment against air-pollution such as tire washer, dust-proof device was relatively higher than other antipollution equipment. As the method appropriating the environmental management cost, we concluded that a quantity-per-unit costing method is more reasonable than appropriating at a fixed rate of total construction cost considering that there is little correlation between total construction cost and the environmental management cost. To do so, antipollution facilities that must be examined at a design or estimation stage of a construction project should be prescribed by the law. Moreover, referenced cost data for the quantity-per-unit costing should be prepared and officially published.