• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.05a
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• pp.119-120
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• 2015

Appropriate management of the finish works in construction project is one of most important activities that must be conducted considering the total duration of the project. Masonry work is a fundamental process that is performed in the preliminary steps of finish works. However, it has been investigated that the analysis of delay factors affecting masonry work has been neglected in the domestic construction site. Therefore, this study deducts delay factors affecting masonry work by literature review and survey on site engineers and labors. This study has been conducted as a preliminary step of developing a construction project interference management system which is expected to suggest objective information for the decision making in construction sites.

• Korean Journal of Construction Engineering and Management
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• v.13 no.3
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• pp.67-77
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• 2012

O Having a highly reliable plan for the process and estimating an accurate construction period during the early stages of a construction project can prevent falsifying the plan and reduce the occurrence of construction delays. Moreover, it allows a succession of swift and accurate decisions to happen. The difficulty in obtaining an accurate estimate of the construction period is especially prominent in high-rise building projects because the works involved are very complicated and costly. As such, it is important that research is done to find out the impacts a reliable plan and good estimate of the construction period can bring with regards to the monthly work efficiency and success of a high-rise building project. However, due to the difference in climatic conditions at high altitude and surface level, the current way of calculating work efficiency in a typical project is inaccurate for a high-rise building project. With that, this paper aims to compute the work efficiency with height, taking into consideration the change in climatic elements at different working heights. A comparison of the results according to the climatic features of each city can also be done in this paper. According to the results calculated in work altitudes, the work efficiency in Busan falls the most. On the other hands, the work efficiency in Seoul falls the least. The reason these results are shown is the influence of wind speed at high altitude. The estimation of work efficiency at high altitude would be used for estimating construction period, feasibility studies, and selecting a city of high-rise building projects.

• Journal of the KSME
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• v.31 no.7
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• pp.590-603
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• 1991

간단하게 원격 조종시스템에 관한 제반 사항을 고찰하였다. 현존하는 첨단 원격 조종 시스템의 제어방법은 양방향/힘반향 방식이며 시스템의 성능 향상을 위해서 원격 조종 시스템, 조종사, 작업 환경과의 동적 상호작용을 고려한 제어 방식에 대한 연구 및 시간지연 등에 관한 연구가 더 요구되고 있다. 그리고 현재까지 대부분의 원격조종기의 활용은 고가의 제작경비, 고중량/대규 모로 인한 성능 저하 및 이동의 어려움 등으로 인해 대단히 제한되어 있으므로 적, 경량/소규모 고성능 원격 제어기의 개발이 시급하다 하겠다. 이를 위해 구조적 설계 및 제어, 표준 요소 활 용(standard module), 인간-기계 인터페이스 등에 관한 많은 연구가 필요하다. 이러한 고성능의 원격 조종 시스템의 개발은 산업, 우주항공, 바다속 작업, 핵시설 유지, 탄광 작업, 건설 등의 각 분야에서의 활용을 통한 기여 및 작업 효율 증대로 인한 생산성 향상, FMS(flexible manufacturing system) 등에서 지대한 효과를 나타낼 것이며 이를 위해 많은 연구 및 투자가 국내에서도 이루어져야 할 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.3
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• pp.1095-1100
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• 2010

Customer satisfaction is a main issue in the modern competitive industrial environment. So quality and productivity are the most important requisites. This paper presents a method for effective real time dispatching for parallel machines with multi product that minimizes mean tardiness and maximizes the quality of the product. In this paper, the effectiveness of the method has been examined in the simulation and compared with other dispatching methods. Using this method presented in this paper, companies can improve customer satisfaction.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.25-31
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• 2005

The decommissioning cost estimation is the very essential procedure to establish the decommissioning plans for Nuclear Research Facilities. The cost estimation must be made in accordance with activity phase and facility installations. This paper shows how to configuring the cost items and identifying the effecting cost factors. In the end, these methods will be utilized as a tool and technique to develop the methodology of cost estimation and calculation program.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.442-445
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• 2003

The purpose of this study is to present an improved lift-up & procurement work flow for effectiveness of resources increase in building construction. The current lift-up & procurement work flow has some waste factors; complicated information system, connection lack with process and decision-making delay. Therefore the study applied the value stream mapping methodology for improvement of current lift-up & procurement work flow. The main contents of the study are as follows; 1) A problem of current work flow were analyzed through current state mapping(CSM). 2) An improved work flow was suggested through future state mapping(FSM). 3) An improvement effect analysis of information system and lift-up planning The study recommends that continuous improvement of lift-up & procurement work flow and efficient management of information in building construction.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.255-256
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• 2007

In case of inappropriate stacking position of the container taking in container yard, the working time for the container would be delayed in taking out because of the occurrence of the re-handle and the increase of the crane moving time. We have to take into account a variety of elements like the crane interference, the container group and stacking height in order to determine the optimal stacking position and decide the weight reflecting the importance of these criteria. We propose the dynamic weight adjustment algorithm for the stacking policy criteria employing the online search in this research.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.676-678
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• 2001

ATM을 이용한 명세에 대한 스케줄링 가능성 분석은 명세된 실시간 시스템의 시간적 제약이 만족되는지를 검증하기 위해 필요한 작업이다. 본 논문에서는 ATM으로 작성된 명세에 스케줄링에 필요한 요소를 추가하여 머신의 형태나 자원의 형태에 따른 다양한 스케줄링 알고리즘을 적용함으로써 ATM 명세가 스케줄링 가능하게 하는 것을 보인다.

• Korean Journal of Construction Engineering and Management
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• v.5 no.1 s.17
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• pp.133-139
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• 2004

The purpose of this study is to present an improved lift-up &procurement work flow for effective resource utilization in building construction. The current lift-up &procurement work flow has some waste factors; complicated information system, connection lack with process and decision-making delay. Therefore the study applied the value stream mapping methodology for improvement of current lift-up &procurement work flow. The main contents of the study are as follows; 1) Problems of current work flow were analyzed through current state mapping(CSM). 2) An improved work flow was suggested through future state mapping(FSM). 3) An improvement effect analysis of information system and lift-up planning was investigated. The study recommends continuous improvement of lift-up &procurement work flow and efficient management of information in building construction as a future research.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.232-234
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• 2000

분산 이동 시스템은 단순한 통신 기능에서 작업 흐름 관리, 화상회의, 전자 메일과 같은 서비스를 제공하는 시스템으로 급속히 확대.발전하고 있으며, 이들 어플리케이션들은 사용자의 요구를 반영하기 위해 메시지를 인과적 순서로 전달해야 한다. 인과적 메시지 전달을 제공하는 기존의 방법들은 많은 피기백(piggyback) 정보로 인한 통신 오버헤드 혹은 어플리케이션으로 전달하는 메시지의 지연, 이동 호스트의 증가에 대한 비확장성 등의 문제점이 있다. 이 논문은 기지국과 이동 호스트 사이의 종속 정보 행렬을 기지국이 유지하며, 즉각 선행자 메시지(immdiate predecessor message)에 대한 종속 정보만을 각 메시지에 피기백하는 방법을 통하여 기존 기법의 문제점을 해결하는 효율적인 인과적 메시지 전달 기법을 제안한다. 제안하는 알고리즘은 이전의 알고리즘들과 비교해서 낮은 메시지 오버헤드를 가지며, 메시지를 전달할 때의 불필요한 지연(inhibition)이 발생하지 않는다. 또한 제안된 알고리즘은 이동 호스트의 에너지 사용에 대한 제약성, 무선 통신의 낮은 대역폭, 이동 호스트 수의 증가에 대한 확장성, 무선 통신의 잦은 접속 단절과 같은 요소를 고려한다.