• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.06a
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• pp.169-170
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• 2020

Occupational Safety and Health Management Cost, used to protect workers in Korean construction worksites and to create safe working environments, is a legally managed expense item. As this cost item is grounded on the Occupational Safety and Health Act, it is always implemented. However, because there is a ceiling on its rates, insufficient amounts of Safety Management Costs are often allocated to worksites, with the money not being used to areas essential to worker safety. As such, the current study raises the need to develop a set of standards to enable some items under the Occupational Safety and Health Management Costs-appropriated under the rate of indirect costs-to be appropriated as direct construction costs. As a preliminary step in this effort, the current study will provide basic data that can be used to create construction cost calculation standards for items that can be calculated as direct construction costs.

• Korean Journal of Construction Engineering and Management
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• v.12 no.4
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• pp.50-58
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• 2011

Lean concept is management philosophy that defines a customer's value and eliminates wasteful and impeditive factors. Management philosophy of Lean in the construction industry is referred to as "Lean Construction". Now this concept has expanded to achieve effective productivity during the design phase. Currently the norm of the domestic design process has been Point-based Design(PBD). It involves selecting a single structurally-feasible design option early and then refining that single design as more information becomes available throughout the design process. This single design is then re-worked until a solution is found that is feasible for all parties. On the contrary, Set-based Design(SBD) is based on lean processes to eliminate waste and improve project productivity. It focuses on keeping the design space as open as long as possible, to allow "subdesign" to advance and not labeling them as secondary in importance. Preserving the maximum number of feasible designs as long as possible reduces the likelihood that rework will be necessary and allows all project participants to utilize their unique expertise to make the project successful. This study proposes that the design methodology of minimizing waste and increasing productivity through SBD of AHP, one of the decision making process so as to compare PBD with SBD and tries to find decision making process and then suggest that application methodology through performs case study of SBD process.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09a
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• pp.1289-1293
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• 2010

A slipring or FORJ are usually adopted in order for power supply of Geo-centrifuge and input/output data acquisition. Since using slipring causes quite a lot electrical noise, an optical communication using FORJ becomes more general for data acquisition. Such data acquisition devices, however, require frequent maintenance and replacement due to deterioration by long term usage. DICT has set up a real-time wireless date acquisition system using wireless communication technology instead of FORJ. The system enables a remote measurement at any inertial acceleration field up to 100g level and provides as same performance as FORJ. The priority of this system is to use a normal modem substituting a special FORJ.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.05a
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• pp.279-284
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• 2002

Prestressed concrete(PSC) bridge structures with a number of continuous spans has been segmentally built in many countries. These methods include incremental launching method, movable scaffolding method, full staging method and balanced cantilever method. In these segmentally constructed prestressed concrete bridges, many construction joints exist and these construction joints are weak points in PSC bridges. The prestress force can be introduced prestress force continuously through the construction joints of PSC bridge superstructure using tendon couplers. The main objective of this study is to evaluate the structural behavior and ultimate flexural strength of construction joints in PSC girder bridge members. To this end, a comprehensive experimental program has been set up and a series of full-scale tests have been performed. Ultimate flexural strength of construction joint in PSC members with tendon couplers is decreased by approximately 10% for non-coupled members.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.11a
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• pp.133-136
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• 2005

While reconstruction has been criticized since 1990 for its tendency of resource over-usage and negative impact on the surrounding environments, remodeling has begun drawing attention as its new alternative. Through examining the recent legal and systematic conditions such as Construction Law, Common Housing Administration Ordinance, and Housing Law, etc. this research analyzes problems on the current legal systems on remodeling, and it aims to suggest systematic and policy-driven schemes which could revitalize remodeling on its software and hardware sides. Careful consideration in regards to remodeling should be given from the initial design stage and throughout the maintenance stages of construction to achieve lengthy durability of buildings, and realization of long-term maintenance costs should also be pursued during this process. This will set in place the practice of remodeling in longer than 50-years intervals since the construction rather than the current 20 or 30 years.

• Journal of the Korea Safety Management & Science
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• v.1 no.1
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• pp.207-216
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• 1999

Too many big accidents have been occurring in Korea during '90. Those were accidents of Sung-Soo Bridge in 1994 and Sam-Poong Department Store in 1995. It was confirmed that the causes of the accident were unreliable construction or building. Therefore, in this study are to use technique of virtual reality(VR) simulation in order to prevent construction accidents. To set up the VR in safety construction, Date Base of variables, VR model and expert system are needed. This system is to build expert system, to visualize of the VR system and navigation, and to find out design errors of construction. Therefore, the purpose of this was to analyze accident type of construction, and apply VR system for simulation technique.

• Proceedings of the Safety Management and Science Conference
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• 1999.11a
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• pp.291-301
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• 1999

Too many big accidents have been occurring in Korea during '90. Those were accidents of Sung-Soo Bridge in 1994 and Sam-Poong Department Store in 1995. It was confirmed that the causes of the accident were unreliable construction or building. Therefore, in this study are to use technique of virtual reality(VR) simulation in order to prevent construction accidents. To set up the VR in safety construction, Date Base of variables, VR model and expert system are needed. This system is to build expert system, to visualize of the VR system and navigation, and to find out design errors of construction. Therefore, the purpose of this was to analyze accident type of construction, and apply VR system for simulation technique.

• KIEAE Journal
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• v.10 no.1
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• pp.85-90
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• 2010

The study set up the models of a general standard apartment house and a super high-rise standard apartment house, which were based on the 5 floor plans of the assessment reference houses of the "green homes" provided by the government; such main construction materials as to account for more than 80% of the entire amount of $CO_2$ emission in a construction work were selected; a database was built up for evaluating the environmental loads of the main materials according to the house types that were different from each other in area, block type, combination of living units or floor; and using the database, an attempt was made to develop the technology to assess $CO_2$ emission from the production of construction materials used in the stage of construction.

• International conference on construction engineering and project management
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• 2007.03a
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• pp.573-582
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• 2007

Working spaces in the construction site are much more complicated than completed spaces in the building. There are many researches focus on partition of building spaces. However, few discussed partition sequencing in building construction sites. Space syntax is a set of techniques for analyzing spatial configurations. It has become a useful tool in a variety of researches. Partition sequencing of working spaces should be related to the working direction. However, with convex space and axial line, the partition sequencing became unrelated to the working direction. When critical space is blocked, the partition sequencing with axial line will be changed. It is significant to reveal the impact of the entire spatial structure when some of the working spaces are blocked. This paper discussed the improved partition sequencing theory and highlighted the importance of critical space and analyzed the spatial structure of working space. A real case project was demonstrated in this paper.

• International conference on construction engineering and project management
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• 2009.05a
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• pp.616-621
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• 2009

Change orders represent one of the largest sources of cost growth on construction projects, but an efficient change management control system can help the projects steer clear of the constant construction changes. This study was performed to achieve a better understanding of all changes and to develop a new set of Best Practices using process mapping techniques. The project data for this research were collected from case studies of aviation projects implemented in Houston, Texas at Bush Intercontinental Airport. The findings and contributions of this research should help owners and project managers determine and identify major causes that impact project budget and schedule and implement solutions prior to them surfacing.