• Journal of Welding and Joining
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• 제30권1호
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• pp.51-58
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• 2012

To assess hydraulic connections between sub-components of the International Thermonuclear Experimental Reactor (ITER) diagnostic port plug, the laser welding and ablation cutting process were investigated in order to be applied the remote handling maintenance. In this study, laser ablation cutting, which vaporizes a small amount of solid material directly into gas by focusing a laser beam of high density energy, is adopted in order to overcome the limitation of the normal laser cutting technology that the head should be placed as close to the work piece as possible to blow out melt metal at a distance. Complete cutting of a work piece is obtained by repetitive multi-passes of the laser beam. The welding and cutting process were tested on the sample work pieces and finally on a prototype of a hydraulic connection module for remote handling. The results showed that this process can be a promising candidate for hydraulic connections by remote handling.

• 한국실내디자인학회논문집
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• 제13권3호
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• pp.93-103
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• 2004

This thesis aims to show the design logics and the meta-design of a public restroom "Between You and Me." This work reinterprets a public restroom regarded as the typical public space by means of spatial agency's influences, on the assumption thor spatial agency controls the properties of public space. This thesis examines our representational system against the public space, and our specific experience in it with the conceptual model of meta-design. Meta-design is a design beyond the design usually we think of. Experiential meta-design, "Between You and Me" presented as the object of this thesis, is a constructive design project which converts our negative perception of the restroom to a new one, "interface." This project, composed of the surrealistic spatial arrangement, urges us to reconsider our fixed thoughts of the restroom and try a creative experience in it. Finally this thesis shows how the space's way of existence fixes our acts and thoughts, and what enables the repetitive acts and thoughts often emerged In our relations with the public space through a meta-design.c space through a meta-design.

• Journal of Construction Engineering and Project Management
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• 제1권1호
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• pp.37-43
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• 2011

Labor productivity is a significant factor associated with controlling time, cost, and quality. Many researchers have developed models to define methods of measuring the relationship between productivity and various parameters such as the size of working area, maximum working hours, and the crew composition. Most of the previous research has focused on estimating productivity; however, this research concentrates on estimating labor productivity and developing time and cost data for repetitive concrete pouring activity. In Korea, "Standard Estimating" only entails the average productivity data of the construction industry, and it is difficult to predict the time and cost spent on any particular project. As a result, errors occur in estimating duration and cost for individual activities or projects. To address these issues, this research sought to collect data, measure productivity, and develop time and cost data using labor productivity based on field conditions from the collected data. A probabilistic approach is also proposed to develop data. A case study is performed to validate this process using actual data collected from construction sites. It is possible that the result will be used as the EVMS baseline of cost management and schedule management.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.781-787
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• 2009

Training and process analysis in the construction industry has not taken full advantage of new technologies such as building information modeling(BIM). The purpose of this research is to develop a framework for the virtual interactive construction education system using three dimensional technologies. The modules will simulate the construction process for a facility from start to finish using information drawn from real projects in the built environment. These modules can be used as training tools for new employees where they attempt to optimize time and cost in a virtual environment given a limited number of equipment, time and employee options. They can also be used as a process analysis tool for new construction where a number of situational variables can change leading to exposure of potential risk. These modules would be particularly useful for repetitive construction where the initial project is analyzed for optimization and risk mitigation. This paper describes the framework and shows a residential construction example using a 900 square foot wood frame single family house designed for the United States.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.776-783
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• 2022

Since Mechanical, Electrical, and Plumbing(MEP) routing is a repetitive and experience-centered process that requires considerable time and human resources, if automated, design errors can be prevented and the previously required time and human resources can be reduced. Although research on automatic routing has been conducted in many industries, the MEP routing in AEC projects has yet to be identified due to the complexity of system configuration, distributed expertise, and various constraints. Therefore, the purpose of this study is to identify the target subjects for MEP routing automation and the constraints of each subject. The MEP design checklist provided by a CM company and existing literature review were conducted, and target subjects and constraints were identified through process observation and in-depth expert interviews for five days by visiting a MEP design company. The target subjects were largely divided into six categories: air conditioning plumbing, air conditioning duct, restroom sanitary plumbing, heating plumbing, and diagram. The findings from interviews show that work reduction and error reduction has the greatest effect on air conditioning plumbing while the level of difficulty is the highest in air conditioning duct and restroom sanitary plumbing. Major constraints for each subject include preventing cold drafts on air conditioning pipes, deviation in ventilation volume in air conditioning ducts, routing order on restroom sanitary plumbing, and separation distance from the wall on heating plumbing. In this way, subjects and constraints identified in this study can be used for MEP automatic routing.

• 한국건설관리학회논문집
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• 제17권4호
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• pp.3-11
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• 2016

최근 국내 기업의 해외 플랜트 수주는 꾸준히 증가하는 추세이며, 2014년 상반기의 수주액은 전년도 대비 93% 이상 크게 증가되었다. 또한, 2015년 3사분기가 지난 현재, 해외 플랜트 수주액은 이미 2,498억 달러를 넘어섰다고 조사된 만큼 플랜트 산업에 대한 관심이 증가되고 있다. 플랜트 프로젝트의 생애주기 중 시공 이전 단계의 건설 사업관리(CM)는 사업 초기 단계에 내재된 불확실성을 보완하고, 합리적인 의사결정을 지원한다는 측면에서 그 역할의 중요성이 대두되고 있다. 그 중에서도 사업 기획 단계의 사업 발굴 및 사업 참여방안 검토 업무는 향후 사업의 성공과 실패를 좌우할 수 있는 큰 영향력을 가진 중요한 업무이지만, 의사결정을 위한 각 분야 간의 빈번한 협의, 그리고 이에 따른 계속된 수정, 변경 등과 비효율적인 반복 작업이 문제가 되고 있다. 따라서 이를 효과적으로 수용할 수 있는 업무 프로세스의 변화가 필요하게 되었고, 본 논문에서는 플랜트 프로젝트 기획 단계의 '사업 발굴 및 사업 참여방안 검토'를 대상으로 주요 업무 항목을 도출하고 전문가 자문을 활용한 델파이 분석을 통해 표준화된 업무 프로세스를 정립하였다. 본 논문의 결과는 우리나라 EPC 기업이 해외시장에서 기획 분야의 기술 경쟁력을 확보하고 업무 효율성을 제고할 수 있는 기반을 마련하는 데에 활용될 수 있을 것으로 기대된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.285-286
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• 2012

In the large scale projects, it is difficult to manage every blocks because of the apartment housing project have repetitive shapes and structures. Therefore, it is necessary to divide construction site into work zones and blocks considering site plan, the number of units per each floor, arrangement of blocks, etc. In this study, 20 influencing factors on the grouping of work zones and formwork crew team formation are identified through case study and literature review. Factors are analyzed to determine the degree of influence through experts interviews. A systematic process of crew formation based on work zoning and the considerations by each steps are presented.

• 한국경영과학회지
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• 제16권2호
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• pp.125-125
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• 1991

This paper presents a framework for the hierarchical PPC(Production Planning and Control) in make-to-order environment with job shop. The characteristics of the environment are described as : 1) project with non-repetitive and individual production, 2) short delivery date, 3) process layout with large scales manufacturing. 4) job shops. The PPC in a make-to-order typically are organized along hierarchical fashions. A model is proposed for the hierarchical job shop scheduling based on new concepts of production system, work and worker organization. Then, a new integrated hierarchical framework is also developed for the PPC based on concepts of the proposed job shops scheduling model. Finally, the proposed framework has been implemented in the Electric Motor Manufacturing and the results showed good performance.

• 한국IT서비스학회지
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• 제8권2호
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• pp.43-70
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• 2009

As software development and maintenance cost increase quickly, information systems managers are more concerned about how to effectively manage software cost. To estimate the software development cost, most public institutes of Korea use the software cost estimation standard established by the government. Unfortunately, the accuracy of the estimation derived from the standard has not been satisfactory in spite of repetitive modifications made to improve it. One of the major reasons for the inaccuracy is that the standard has too small a number of cost adjustment factors to reflect the various characteristics of a software development project. To remedy this problem, we propose new cost adjustment factors which can be incorporated into the standard and are important to enhance the estimation accuracy, based on the analysis of several well-known software estimation models. Furthermore, by applying the proposed model to real world software projects, we show that the proposed model can produce more accurate estimates than the current standard.

• 경영과학
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• 제16권2호
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• pp.125-135
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• 1999

This paper presents a framework for the hierarchical PPC(Production Planning and Control) in make-to-order environment with job shop. The characteristics of the environment are described as : 1) project with non-repetitive and individual production, 2) short delivery date, 3) process layout with large scales manufacturing. 4) job shops. The PPC in a make-to-order typically are organized along hierarchical fashions. A model is proposed for the hierarchical job shop scheduling based on new concepts of production system, work and worker organization. Then, a new integrated hierarchical framework is also developed for the PPC based on concepts of the proposed job shops scheduling model. Finally, the proposed framework has been implemented in the Electric Motor Manufacturing and the results showed good performance.