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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 12, Issue 6 - Nov 2011
Volume 12, Issue 5 - Sep 2011
Volume 12, Issue 4 - Jul 2011
Volume 12, Issue 3 - May 2011
Volume 12, Issue 2 - Mar 2011
Volume 12, Issue 1 - Jan 2011
Selecting the target year
Development of Safety Management Index for Contractor Assessment in Bidding Process
Ji, Soung-Min ; Koo, Kyo-Jin ; Hyun, Chang-Taek ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 3~13
DOI : 10.6106/KJCEM.2011.12.6.3
The construction industry is still the most risky industry and labor accident is a significant management factor on construction site. Safety management has been studied for improving the safety performance on construction sites. However, Almost all of them have been considered on the site safety management for the contractors and evaluation of accident rate. To resolve the limitation of current research, this study is focused on considering accident result and effort by performing the evaluation of safety level of the head office and site in construction companies. By studying the research about a safety management and interviewing with specialists in safety management, 7 items were selected and weighted based on the KOSHA18001 List. Consequently, The checklist was developed to evaluate safety performance management in construction company and Safety Management Index was suggested to coordinate 1) the score of results in accident rate and 2) the effort to evaluate a safety performance management. Safety Management Index is more helpful to evaluate the safety management results and effort. As a result of considering the score of the accident rate and the safety performance management, the outcome of prequalification was changed. Using this index, contractors will attempt to prevent accidents and owners will be able to discriminate individual differences in bidding process.
A Proposal for Optimizing Unit Modular System Process to Improve Efficiency in Off-site Manufacture, Transportation and On-site Installation
Lee, Kwang-Bok ; Kim, Kyung-Rai ; Shin, Dong-Woo ; Cha, Hee-Sung ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 14~21
DOI : 10.6106/KJCEM.2011.12.6.14
A unit modular system is a construction method which installs on site by manufacturing 50%~90% of the whole process in the factory. This method can minimize the process in the site and maximize the operation, which will reduce the duration and improve the overall quality. The recent paradigm of construction is to be sustainable building. Modular system can be regarded as a sustainable building construction method because it can reduce the amount of construction waste by recycling partial or whole part of overdue building be torn down. A unit modular system is the answer to cope with the increasing market of small size housings. A unit modular system is the most appropriate option at this point. This research proposes the standard operation and construction process of modular system, which enable to optimal system. A case study of reconstructing small-size housing was introduced to support this proposal. Finished unit modular is the reasonable way. However, 80% of complication rate of the modular is the most rational when a defect occurrence during delivery is considered.
Safety Management of the Retaining Wall Using USN Sonar Sensors
Moon, Sung-Woo ; Choi, Eun-Gi ; Hyun, Ji-Hun ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 22~30
DOI : 10.6106/KJCEM.2011.12.6.22
In the construction operation, foundation work should be done in advance for the building structure to be installed. This foundation work include a number of activities such as excavation, ground water prevention, piling, wale installation, etc. Caution should be taken in the operation because the dynamics of earth movement can cause a significant failure in the temporary structure. The temporary structure, therefore, should be constantly monitored to understand its behavior. This paper introduces the USN-based monitoring system to automatically identify the behavior of the temporary structure in addition to visual inspection. The autonomous capability of the monitoring system can increase the safety in the construction operation by providing the detailed structural changes of temporary structures.
An Administration Model for Causes of Delay in Construction Projects to Decide Time Extension Responsibility
Kim, Jong-Han ; Kim, Kyung-Rai ; Han, Ju-Yeoun ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 31~41
DOI : 10.6106/KJCEM.2011.12.6.31
Since the cases of time extension have continuously transpired in the public construction project, the potential of economical loss and claims is increasing because the concerned parties such as an owner or a contractor have not properly performed their own responsibility for time extension. One of the main reasons is that the present planning and scheduling do not support the method to apportion the proper responsibility to the right party. This problem has repeatedly led to time extension and made it difficult for the concerned parties to perform the responsibility for time extension. In order to overcome this problem, a framework of delay administration is required as the method to apportion the proper responsibility to the right party. To solve this problem, this paper aimed to develop the conceptual model and prototype system as the practical method to administrate delay causation. Furthermore, the verification result for the reliability and applicability throughout the case studies on real construction projects shows that the conceptual model and prototype system developed would help efficiently to administrate the delay causation.
A Study on the Development of Work-Crew based Daily-Productivity for Representative B.O.Q Item in Road Project
Seo, Ji-Hyeong ; Park, Hyung-Keun ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 42~53
DOI : 10.6106/KJCEM.2011.12.6.42
This study is to present a method of compiling consistently accurate construction cost estimates in minimum of time. There are two kind of applications for estimating system based on quantity-per-unit and the daily work-crew. The former system is still applied 45% as a estimating method to construction job site by the second half of 2010. However, it is necessary for quantity-per-unit to complement the defect of standard integrating specification and improve the integrating method to the various construction conditions. The later system is intended to represent a standard or basic core which can be adopted in many type of construction estimating used across the wide variety of construction in advanced countries. In this study daily work-crew based on productivity is applied to the representative B.O.Q Item in road project. These results are compared to productivity of Japan and U.S.A estimated under the similar circumstances.
The Concept of Schedule and Cost Progress Integrated Management on the BDM Network
Kim, Seon-Gyoo ; Lee, Yong-Hyun ; Noh, Seong-Beom ; Ko, Dae-Gyu ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 54~64
DOI : 10.6106/KJCEM.2011.12.6.54
Almost 40 years have been passed since the CPM was introduced to the construction industry in Korea. However most of construction projects in Korea do not prepare the CPM schedule neither operate it after established manually, as well as still depend on the Bar-chart schedule only. One of these reasons is because the CPM schedule does not reflect the site works realistically, it makes so difficult to recognize the actual progress clearly in visual format, and it is impossible to integrate and manage the time and cost oriented work progresses effectively. This paper proposes new concept of progress management that is able to integrate and manage the time oriented schedule progress and earned value oriented cost progress while maintaining the merits of CPM although the CPM schedule summarized automatically within a schedule hierarchy by the BDM that is a new CPM technique. We expect that this concept could make the applications of CPM technique to the domestic construction industry popular and help the advancement of the construction management in Korea as well.
A Study on the Construction Cost Risk through Analyzing the Actual Cost of Public Apartment
Yoon, Woo-Sung ; Go, Seong-Seok ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 65~78
DOI : 10.6106/KJCEM.2011.12.6.65
Construction business, which is complex and long-term business, requires accurate estimation and verification in construction costs and payment procedure from project planning to the completion of construction phase. And more importantly, it is necessary to investigate and determine the risk factors related to construction costs during the entire process including design planning, construction drawings, and quantity calculating. But, currently, it is not seem to be adequate to cope with the risk and increased construction costs against the operational budget in terms of actual costs when screening and estimating the bidding cost of public apartment. Therefore, this study selected and analyzed 40 sites' report of construction completion account from 2004 to 2010 focused on the adequacy on the modification of contract and design planning and on the complication of the budget in the beginning of the project. This study deducted various risk causes and results by analyzing actual costs according to year, architectural area, region, construction cost and sale/lease classification. We could find out construction risk according to annual variation of government policy and economy, and also deducted risk items by construction characteristic according to region and architectural area. Study result, we first found out the problems of lowest price award system according to the construction costs. The weight of the cost increase risk was analyzed that subcontract and material costs are very high. Roof and tile work were analyzed highly in subcontract cost risk and reinforcing bar and cement were analyzed highly in material cost risk, among direct construction cost. Finally, this study results could be used in comparing the categories of the construction costs made by specific construction process, belonging to the construction costs, with the operational budget made in the beginning of the project that can enable to grasp unpredictable risks over the construction costs and making quantitative analysis for it through analyzing the range of fluctuation and variations led by the fluctuations in the actual construction costs.
An Index for Measuring the Degree of Completeness of BIM-based Quantity Take-Off
Lee, Chang-Hee ; Kim, Seong-Ah ; Chin, Sang-Yoon ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 79~92
DOI : 10.6106/KJCEM.2011.12.6.79
Quantity take-off is one of the critical tasks that determine the cost of a construction project, and its result should be accurate and reliable. BIM-based quantity take-off is a very attractive process for practitioners since the quantity take-off can be done automatically in a fast and accurate way. However, the result of BIM-based quantity take-off can be varied depending on how BIM was modeled. As a project progresses, more detailed design information is getting available, and it can be expected that the degree of completeness and accuracy for the BIMbased quantity take-off is going to be improved as well. However, when estimation is performed at each stage of a project life-cycle, there is no way to measure or forecast how accurate of the quantity take-off result from the BIM data given at the current stage. Therefore, this research derived factors that affect the BIM-based quantity takeoff and developed a methodology and framework to measure and forecast the completeness of BIM-based quantity take-off. The measurement framework and index that are proposed by this research was verified and validated for their consistency and feasibility through six pilot projects.
Identification of Core Competencies of Construction Managers
Kim, Dong-Hee ; Kim, Han-Soo ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 93~100
DOI : 10.6106/KJCEM.2011.12.6.93
As the construction management(CM) market has grown, so has the CM competition in the market place. Consequently, competent construction managers become a core part of CM firms' competitiveness. The objective of the study is to identify and discuss core competencies of construction mangers based on literature survey, Delphi Method and AHP. Among various competencies required for construction managers, skills for problem solving, trust and negotiation skills were identified as the crux of construction managers' competencies. A better understanding of construction managers' core competencies is very critical in terms of CM firms' training of construction managers and continuos self-improvement for construction managers.
Multi-family Housing Complex Breakdown Structure for Decision Making on Rehabilitation
Hong, Tae-Hoon ; Kim, Hyun-Joong ; Koo, Choong-Wan ; Park, Sung-Ki ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 101~109
DOI : 10.6106/KJCEM.2011.12.6.101
As climate change is becoming the main issue, various efforts are focused on saving building energy consumption both at home and abroad. In particular, it is very important to save energy by maintenance, repair and rehabilitation of existing multi-family housing complex, because energy consumption in residential buildings is not only forming a great part of gross energy consumption in Korea but the number of deteriorated complexes is also sharply increasing. However, energy saving is not considered as a main factor in decision making on rehabilitation project. Also, any supporting tool is not appropriately prepared in existing process. As the first step for development of decision support system on rehabilitation, this paper developed a breakdown structure, which makes clusters of multi-family housing complexes. Decision tree, one of data mining methods, was used to make clusters based on the characteristics and energy consumption data of multi-family housing complexes. Energy saving and CO2 reduction will be maximized by considering energy consumption during rehabilitation process of multi-family housing complex, based on these results and following research.
Prediction Model for Gas-Energy Consumption using Ontology-based Breakdown Structure of Multi-Family Housing Complex
Hong, Tae-Hoon ; Park, Sung-Ki ; Koo, Choong-Wan ; Kim, Hyun-Joong ; Kim, Chun-Hag ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 110~119
DOI : 10.6106/KJCEM.2011.12.6.110
Global warming caused by excessive greenhouse gas emission is causing climate change all over the world. In Korea, greenhouse gas emission from residential buildings accounts for about 10% of gross domestic emission. Also, the number of deteriorated multi-family housing complexes is increasing. Therefore, the goal of this research is to establish the bases to manage energy consumption continuously and methodically during MR&R period of multi-family housings. The research process and methodologies are as follows. First, research team collected the data on project characteristics and energy consumption of multi-family housing complexes in Seoul. Second, an ontology-based breakdown structure was established with some primary characteristics affecting the energy consumption, which were selected by statistical analysis. Finally, a predictive model of energy consumption was developed based on the ontology-based breakdown structure, with application of CBR, ANN, MRA and GA. In this research, PASW (Predictive Analytics SoftWare) Statistics 18, Microsoft EXCEL, Protege 4.1 were utilized for data analysis and prediction. In future research, the model will be more continuous and methodical by developing the web-base system. And it has facility manager of government or local government, or multi-family housing complex make a decision with definite references regarding moderate energy consumption.
An Algorithm for Hoisting Time Calculation in Super-tall Building Construction
Cho, Chang-Yeon ; Shin, Yoon-Seok ; Won, Seo-Kyung ; Kim, Jung-Yeol ; Cho, Moon-Young ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 120~129
DOI : 10.6106/KJCEM.2011.12.6.120
An installation of the construction lift has a few limitations by many constrains and these have influences on labor productivity, that can be changed by vertical-transportation management. In the super-tall building construction, a management of construction lift operation is one of the most important factor, but existing methodologies depend on skilled practitioners' experiences. And it is true that the expertise resulted by the experiences does not transfer to the next generation. This study is a part of lifting-management simulation development which aims at the optimal construction lift management. A proposed algorithm is focus on lifting time calculation considering an acceleration capability. This research evaluates the result accuracy using comparative analysis on simulation result and field measuring time.
Object Detection From 3D Terrain Data Gener Ated by Laser Scanner of Intelligent Excavating System(IES)
Yoo, Hyun-Seok ; Park, Ji-Woon ; Choi, Youn-Nyung ; Kim, Young-Suk ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 130~141
DOI : 10.6106/KJCEM.2011.12.6.130
The intelligent excavating system(IES), the development in South Korea of which has been underway since 2006, aims for the full-scale automation of the excavation process that includes a series of tasks such as movement, excavation and loading. The core elements to ensure the quality and safety of the automated excavation equipment include 3D modeling of terrain that surrounds the excavating robot and the technology for detecting objects accurately(i.e., for detecting the location of nearby loading trucks and humans as well as of obstacles positioned on the movement paths). Therefore the purpose of this research is to ensure the quality and safety of automated excavation detecting the objects surrounding the excavating robot via a 3D laser scanning system. In this paper, an algorithm for estimating the location, height, width, and shape of objects in the 3D-realized terrain that surrounds the location of the excavator was proposed. The performance of the algorithm was verified via tests in an actual earthwork field.
Comparative Analysis on Repairing Cost of Lawsuit on Concrete Crack Defect in Apartment Building
Kim, Beop-Su ; Park, Jun-Mo ; Choi, Jeong-Hyun ; Seo, Deok-Seok ; Kim, Ok-Kyue ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 142~150
DOI : 10.6106/KJCEM.2011.12.6.142
Defect dispute has been increasing to claim by condominium, in increasing to demand and concern in value, quality, and management of apartment building since 2000s. In this study, for checking property of cost in crack issue with precedure of lawsuit on defect, it is analyzing details about repairing cost of concrete crack defect that formed 77 percent of repairing cost. Futhermore, it is studying of composition of repairing cost and difference of repairing cost by repairing method. This is checking details that cost growth has a difference whether court accept a acceptable range of crack width, and repairing method and reinforcement work has to choose between a surface treatment method, a filling method and a injecting method. Meanwhile, it is considerable that disparity of repairing cost whether is a method of painting work.
A Study on Optimizing of Roof-Top Photovoltaic Arrays Arrangement Based on Three-Dimensional Geo-Spatial Information
Kim, Se-Jong ; Koo, Kyo-Jin ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 151~159
DOI : 10.6106/KJCEM.2011.12.6.151
Due to the Korean government's renewable energy support policy such as the renewable energy utilization building certificate and enlarging the compulsory ratio of investment on the public building, the rooftop photovoltaic projects are expanding rapidly. It is very important for the rooftop photovoltaic projects to analyze the shading effect of the adjacent structures or own facilities. But, the photovoltaic arrangements are planned by the experience of the designers or simple graphic tools. The purpose of this study is to build the process model for optimizing of rooftop photovoltaic arrangement based on three-dimensional geo-spatial information.
An Analysis on the Pre-Feasibility Evaluation Factors of Activation for Welfare Facilities for the Residents in Apartment Building
Kim, Young-Hoon ; Kang, Hyun-Wook ; Won, Yoo-Man ; Kim, Yong-Su ;
Korean Journal of Construction Engineering and Management, volume 12, issue 6, 2011, Pages 160~167
DOI : 10.6106/KJCEM.2011.12.6.160
An Analysis on the Pre-Feasibility Evaluation Factors of Activation for Welfare Facilities for the Residents in Apartment Building. The adapted research method of selected case five apartment building in D new town and carried out questionnaire survey to residents and user for draw items of feasibility evaluation. Drew items of feasibility evaluation classify as Plan section, Design section, and Operation section and evaluate the weight of each section utilizing analytical hierarchy process (AHP). Depending on the purpose and methods. The results of this study are as follows: Such as Plan section, Composition of Program Facility, User Charge Survey, Arrangement of Program Room were analyzed highest. Such as Design section, Arrangement of Program Room, Circulation planning, Educational Equipment were analyzed highest. And such as Operation section, Operation costs, Operation Plan, Review of Program Facility were analyzed highest.