• Korean Journal of Construction Engineering and Management
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• v.21 no.5
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• pp.20-28
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• 2020

In construction project, an error in quantity information immediately leads to an error in the quotation, highly reliable quantity calculation is required for successful performance of a project. But there is a difficulty in the current situation for the person in charge to review all calculation sheets for quantity review as the quotation work has to be performed in a short period of time. Accordingly, it is thought that a review plan is required to secure reliability on calculated results and the review plan should be able to be carried out within insufficient quotation periods. In the present paper, it is intended to present a plan that enables quantity to be reviewed with the minimum number of persons within the shortest period of time through an algorithm of calculating a verification quantity. The suggested algorithm allows the result of quantity calculation work carried out earlier based on 2-dimensional drawing to be compared, not with an accurate quantity, but within an error range.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.6
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• pp.124-140
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• 2017

There exists a limitation to provide proper advance information for safe maneuvering through guidance and caution signs in freeway mobile work zones, unlike fixed work zones. Although a work-protection vehicle is currently deployed at the rear of the work vehicle, more active countermeasures to prevent crashes are required. The purpose of this study was to propose a method to evaluate the safety in mobile work zones and to present effective countermeasures. Driving simulation experiments were conducted to analyze characteristics of driver's behavior in mobile and fixed work zones. Safety distance index (SDI) based on the comparison of stopping distances of a work-protection vehicle and a following subject vehicle was used to evaluate traffic safety. More dangerous driving behavior was observed in the mobile work zone. Especially, it was identified that the lane-change of vehicles following the work- protection vehicle was late. Therefore, it is necessary to actively introduce methods to provide warning information so that the driver can recognize the work-protection vehicle in advance and carry out appropriate evasive maneuvers.

• Korean Journal of Construction Engineering and Management
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• v.21 no.4
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• pp.21-29
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• 2020

This study analyzed problems of operating performance bond for public works and derived some suggestions for improvement. The Contract Law for Government Owner requires to submit performance bond which guarantees performing the construction contractor pays back compensation money when the obligation is not executed. Currently, first bid eligibility for participation is exactly required for executing company of performance bond obligation, not considering volume, technical level, and special type of remaining works. In collaboration contract, if guarantee accident occurs, it is obliged for remaining collaboration contractors to be qualified to fulfill the whole contract. This study proposes following improvement plan to solve problems of current performance bone in public works. Firstly, qualification criteria must be deregulated exceptionally for selecting proper contractor, which executing performance bond obligation, considering progress and characteristics of remaining works. Secondly, In collaboration contract, the prerequisite of remaining contractors' should be deregulated as 'implementation requirement of the remaining works'from'implementation requirement of the whole work'. Finally, defect responsibility should be included in liabilities of performance bond by specifying that owner or guarantee agency bear them.

• Journal of the Korea Institute of Building Construction
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• v.10 no.1
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• pp.49-56
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• 2010

A competitive construction project must address factors such as cost, performance, aesthetics, schedule and quality. The importance of these factors will vary from project to project and from market to market. Productivity is becoming an ever-more important factor in the acquisition of a project. As the technology or aesthetics of a product matures or stabilizes, and the competitive playing field levels, competition is increasingly based on time. Recently, the construction industry has been depressed due to difficult market circumstances. At this time in particular, construction companies are striving to rationalize their management, both in their planning offices and in the field. In this study, we present a method of calculating a reasonable duration for reinforced form work. We did this by first developing a question for field workers, then sampling form workers based the question. Second, we employed a work analysis method to analyze worker"s work-methods and Time. Then, using the result of this analysis, we measured the Productivity of form work. This measure can be used as basic data to determine the appropriate duration of form work.

• Korean Journal of Construction Engineering and Management
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• v.9 no.1
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• pp.134-142
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• 2008

Recently, international plants construction markets are expending. Specially, oil/gas plants constructions in Middle-East are booming. However, international plants construction projects are high risky. So a risk assessments and managements methodology for international plants construction is needed. In this study, the risk assessment methodology for international plants construction is proposed on the basis of the literature review in the international construction risk assessment methods and the knowledge of experts explored by interview. In addition, case study in Middle East was applied for reviewing these risk assessments and managements methodology for international plants construction.

• Korean Journal of Construction Engineering and Management
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• v.9 no.1
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• pp.66-76
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• 2008

Plant project is a complex project that consists of civil engineering, building, mechanical and electronic works. The schedule management is one of important factors in plant project because the construction duration of the project is very short comparing with the other construction projects. Specially, 4D CAD system needs to visualize construction schedule information in those complex projects. This study suggests methodologies for improving 4D CAD functions by considering those project characteristics. To develop a plant 4D CAD system, this study includes to develop new functions by analyzing actual schedule information from the plant construction sites.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.523-526
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• 2002

In the bearing wall systems, a form work has a lot of room that saves cost because it takes a substantial proportion of construction cost. Therefore the systemic and efficient methods are required in the form work. This study focuses on methods that enhance the quality and the productivity of form work and presents the kicker form as an alternative plan to simplify the form work through being modular and automatical it. Work sampling method is used for productivity measurement. It is expected that it will reduce the work process and improve the Qualify and the podructivity of construction.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.510-514
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• 2004

This research is a preliminary one to investigate transitional problems of actual-cost-date-based contract cost estimation method and suggestions for counteracting them. As parts of it, in this paper, the brief background and methods of the new method and contract costs estimated by introducing it are presented. The results of five projects' contract costs are compared to those estimated by the conventional quantity-based method. Comparison of the both is conducted in terms of total contract costs and contract costs according to type of sub-contracts. Finally, the propositional differences of the later to the former are analysed.

• Bulletin of Food Technology
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• v.15 no.4
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• pp.3-16
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• 2002

한국담배인삼공사의 민영화에 따라 인삼의 공익적 연구기능을 수행해 왔던 한국인삼연초연구원이 한국담배인삼공사의 중앙연구원으로 흡수되어 민간연구소화 되면서 공익적 인삼연구기관의 공백 상태가 되었다. 이에 한국을 대표하는 상품인 고려인삼의 공익적 연구를 수행할 인삼연구기관의 설립 필요성 및 방안에 대한 관계 부처 협의에 따라 한국식품개발연구원(정부출연 연구기관)에 2002년 11월부로 인삼연구단이 발족하게 되었다. 한식연의 인삼연구단은 2003년 순수 인삼관련 연구비로만 12억을 확보하고 앞으로 "고려인삼의 효능에 대한 우수성의 과학적 입증과 품질차별화", "인삼 가공 연구와 가공산업 활성화 및 수출촉진", "인삼 및 인삼제품류 고품질 유지를 위한 유통 및 품질관리 기술 확립", "국제경쟁력 강화를 위한 인삼 및 인삼제품류의 규격기준 설정" 등의 연구를 수행하여 고려인삼을 한국을 대표하는 세계 초일류상품으로 발전시킬 것입니다.

• Bulletin of Food Technology
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• v.15 no.4
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• pp.17-28
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• 2002

한국담배인삼공사의 민영화에 따라 인삼의 공익적 연구기능을 수행해 왔던 한국인삼연초연구원이 한국담배인삼공사의 중앙연구원으로 흡수되어 민간연구소화 되면서 공익적 인삼연구기관의 공백 상태가 되었다. 이에 한국을 대표하는 상품인 고려인삼의 공익적 연구를 수행할 인삼연구기관의 설립 필요성 및 방안에 대한 관계 부처 협의에 따라 한국식품개 발연구원(정부출연 연구기관)에 2002년 11월부로 인삼연구단이 발족하게 되었다. 한식연의 인삼연구단은 2003년 순수 인삼관련 연구비로만 12억을 확보하고 앞으로 "고려인삼의 효능에 대한 우수성의 과학적 입증과 품질차별화", "인삼 가공 연구와 가공산업 활성화 및 수출촉진", "인삼 및 인삼제품류 고품질 유지를 위한 유통 및 품질관리 기술 확립", "국제경쟁력 강화를 위한 인삼 및 인삼제품류의 규격기준 설정" 등의 연구를 수행하여 고려인삼을 한국을 대표하는 세계 초일류상품으로 발전시킬 것입니다.