• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.609-612
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• 2008

Since most of the industries have adopted automation system, the industrial disaster has been declined sharply. Also automation system has offered many benefits such as productivity and assured quality. However, the construction industry is still relying on man power and because of this there are many victims occurring due to the industrial disaster. Construction industry has to overcome uncertainty of incidents and changing natural surroundings to actualize automation. Therefore, the efficient working plan and intelligent decision making process are needed to run more developed techniques and automations. Specially to decline the rate of industrial accidents occurred in basic construction in earth work, the automation via excavator is necessary and also the development of planning process system is too. This research is to establish Task Planning System to prevent disaster which is used for planning automated earth work.

• 대한토목학회논문집
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• 제28권6D호
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• pp.859-869
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• 2008

현재 전 세계적으로 이미 대부분 산업에서의 생산라인은 자동화되었으며 이는 생산성 및 경제성의 향상, 산업 재해에 대한 안전성 확보, 품질 향상 및 경쟁력 향상 등 많은 이익을 가져왔다. 그러나 건설 산업에서 자동화는 일반적인 산업생산라인과 달리 끊임없는 불확정적인 사건의 발생과 이에 따른 지능적 판단 및 처리 능력의 필요성으로 인한 해결해야 할 많은 어려움이 따르기 때문에 여전히 건설 기계장비 사용을 통한 노동력 투입에 의존하고 있다. 이러한 문제를 해결하기위하여 유럽, 미국, 일본 등 선진국에서 건설 자동화를 위한 끊임없는 연구가 진행 중이며 도로 포장, 다짐 및 작업프로세스가 비교적 단순한 반복형 작업에 대하여 자동화가 많이 이루어 졌지만 건설 현장에서 가장 비중을 많이 차지하는 토공 작업에 대하여 아직 자동화 연구가 미흡하다. 토공 작업의 자동화를 위해서는 획득된 지형정보를 분석하여 효율적인 작업 계획의 수립이 수행되어야 하며, 이를 위해 숙련된 작업자의 휴리스틱스(heuristics)를 활용하면 보다 시행착오가 적고 안전하며 효율적인 작업계획을 수립할 수 있을 것이다. 따라서 본 연구에서는 지능형 굴삭 시스템의 효율적인 작업계획의 수립을 위한 시스템인 지능형 Task Planning System의 구성 체계 및 각 단계마다 적용된 휴리스틱스(heuristics)에 대하여 소개하여 본다.

• 한국건축시공학회지
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• 제8권4호
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• pp.71-77
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• 2008

Earthwork is very equipment-intensive task and researches related to automated excavation have been conducted. There is an issue to secure the safety for an automated excavating system. Therefore, this paper focuses on how to improve safety for semi- or fully-automated backhoe excavation. The primary objective of this research is to develop the core technology for automated object detection in excavation work. In order to satisfy the research objective, a diverse sensing technologies are investigated and analysed in terms of functions, durability, and reliability. The authors developed detecting algorithm for the objects using laser sensor and verified its performance by several tests. The results of this study would be the basis for developing the automated object detection system.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.364-367
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• 2007

도심지에서 수행하는 공사가 확대되면서 소음, 진동 등을 최소화하는 공법으로, 지하연속벽 공법이 제안되어 많은 활용이 이뤄지고 있다. 지하연속벽 공법은 기존 공법에 비해 대심도 굴착이 가능하며, 소음과 진동이 적어 활용도가 높음에도 불구하고 굴착 작업 간 수직도 확보를 위해 많은 시간이 소요된다. 공법의 적용이 이뤄지고 있는 현장방문 결과 건설기계를 통해 작업이 진행됨에도 불구하고 장비를 조작하는 조작자의 경험과 직관에 더 높은 의존도를 갖고 있는 것이 큰 문제로 조사되었다. 본 연구는 지하연속벽 공법의 주요 장비인 트렌치커터 운전기사 및 관련된 기술자들과의 인터뷰를 바탕으로 공법과 장비의 특성을 조사하고 Cost-oncern Matrix를 통해 굴착장비의 자동화 도입 타당성을 검토하였다. 연구를 통해 지하연속벽 공법에서 굴착 작업을 수행하는 트렌치커터를 자동화 하는 것이 타당한 것으로 판단된다.

• 한국건설관리학회논문집
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• 제8권4호
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• pp.194-202
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• 2007

건설공사의 초기 단계인 토공사의 경우 현장 토공계획에 부합하는 다양한 건설장비를 활용하여 수행된다. 이 경우 짧은 시간에 다종의 건설기계장비가 투입되며 많든 공사비가 소요되는 만큼 어느 공종보다도 토공관리자의 합리적인 계획 수립이 요구된다. 그러나 대부분의 경우 경험과 직관을 바탕으로 토공장비계획이 수립되어 공정관리 및 원가절감 차원에서 적절한지 검증이 어려우며, 계획수립에 요구되는 고려조건이 변경될 때마다 시간과 인력을 투입해야하는 실정이다. 이에 본 연구에서는 시스템 다이내믹스 기법을 활용하여 기계화 토공장비의 굴삭과 적재 및 운반단계를 대상으로 토공장비의 적정 조합모형을 구축한다. 연구의 결과로 도출되는 토공장비의 적정 조합모형은 토공계획을 담당하는 관리자가 토공장비계획을 함에 있어 짧은 시간에 합리적인 판단을 하도록 지원해줄 것으로 기대된다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.74-77
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• 2007

In this paper, we propose a system which can display panoramic-stereopic image for tele-operating excavator. the system was implemented by using center-viewpoint corresponding algorithm and image mosaic process. We could obtain remarkable result from the survey among the ex-pert of excavator. We also design a control station with RF transfer module, H.264 codec module and suggested algorithm. Especially, our system shows a superb performance on cubic effect and presence sense of a field of excavating work.

• 한국건축시공학회지
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• 제8권1호
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• pp.37-42
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• 2008

As use of construction equipment has been increasing continuingly, the proportion of equipment expense to the total construction cost has become higher. However, there is a difference between the equipment expenses section in 'Poom-Sam' and practical data, because 'Poom-sam' does not consider non-working days due to weather conditions, legal holidays and management conditions. Therefore, 'Poom-Sam' does not present a reasonable standard for estimating construction equipment expenses. In this study, to estimate realistic construction equipment operating hours, firstly, construction equipment was classified according to work, and weather conditions, in which each work could not be executed, were established. Then, weather data on Seoul and Busan($2004{\sim}2006$) and legal holidays were analyzed to suggest annual standard operating hours. The annual standard operating hours of earthmoving & excavating, compaction, and drilling equipment was estimated to be 1,430 hours, and lifting equipment, concrete paving equipment, asphalt paving equipment, concrete equipment, and crushing & conveying equipment were estimated to be 2,124 hours, 1,156hours, 1,188hours, 1,688hours, and 2,152hours respectively.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.95-107
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• 2000

The primary purpose of dredging work is to maintain navigational readiness and to increase environmental amenity, so that the dredging project which is composed of excavating, removing, transporting, storing and disposing dredged material must be carefully managed to insure that dredging works are completed in a cost-effective and environmentally safe manner. The most important point in dumping operations is an estimating and reducing the impacts of discharges at the dumping area. One of the most effective method for the reduction of ecological impacts at dumping area is using the schematic process composed of the sophisticated plan, precise work and predicting/reducing the impacts based on the numerical model and field observation. In this study, the numerical model is used to predict the near-field spatial fate and begavior of effluent discharged from Confined Dumping Facility(CDF) located near coastal area. To to this purpose, reappearing of tidal current was preceded. The model is then applied to Mokpo harbor, where capital dredging and maintenance dredging are conducted simultaneously and the CDF is under construction;. In the series of model case study, we found that the near-field behavior of effluent discharged from CDF was governed by the receiving water condition, outfall geometry, characteristics of efflent and CDF operating conditions.

• 한국항만학회지
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• 제14권4호
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• pp.429-439
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• 2000

The primary purpose of dredging work is to maintain navigational readiness and to increase environmental amenity. Therefore the dredging project, which is composed of excavating, removing, transporting and storing or dumping dredged material, must be carefully managed to insure that dredging works are completed in a cost-effective and environmentally safe method. The most important point in dumping operations is evaluating and decreasing the impacts of dumping works at the dumping area. One of the most effective method for this purpose is using the schematic process composed of the sophisticate plan, precise work and predicting/reducing the impacts based on an numerical model being closely linked with field observation. In this study, a numerical model is used to predict the spatial transport and fate of the effluent discharged from the confined dumping facility(CDF) located at a coastal area. To achive this purpose, numerical models were used for reappearing the tidal current of concerned area. These models were then applied to Mokpo harbpr where capital dredging and maintenance dredging are being conducted simultaneously and the CDF is under construction. In series of model case study, we found that the effluent discharged from CDF was governed by the receiving water condition and outfall geometry, so that limit of near-field was 14∼500 meter down stream and 4∼150 meter in transverse direction. dilution ranged from 1.1 to 8.2 on the cases. Long-term diffusion characteristics was governed by the dilution rate during near-field behavior, ambient conditions and CDF operation modes.

• 한국안전학회지
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• 제10권3호
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• pp.96-105
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• 1995

The better industry develops, the more spaces need but in the limited area. Most building become larger and more complicated if the more spaces need in the constant area. And this leads to do underground work in long period generally six(6) months for 6 basement stories due to the selection of TOP DOWN technique. Working environment in this underground area can be problems and should not be overlooked, because air quality in underground spaces become quickly worse. Recently, department name to control construction safety has been changed to ENVIRONMENT & SAFETY TEAM from SAFETY TEAM. This means that it is very important to control against environmental condition at site so much. Overall construction work as well as underground work should conform to the requirement of working environment, particularly against inhabitants around the construction area. Strut protection, one of earth protection method, in case to 40m long strut may become weaker due to thermal stress or its longitudinally compressive strain and the another one, earth anchor protection may not be applied to the site In case of encroaching on vertical underground borderline because of regulation to prohibit it. It is necessary that TOP DOWN technique should be introduced in order to solve the external and internal problem of the site such as difficulty level of the work, potential danger with excavating depth, and shortening workperiod. It is needed that improving way of working condition should be shown and simplified computer simulation program should be also provided for checking pollution level & ventilation, excluding of lighting problem here. Results measured with conformance to the Regulation for Working Environment Measurement, enforced by Ministry of Labor have been applied to the computer program developed here. Sample air taken at unit workplace which was considered as exposing condition of pollutant at breathing point and within a range of behavior of the workers, Identified exposing group in underground work, using Moded Flow Life Finally, three types of ventilation system, type I with blower & ventilator, type II natural supply with mechanical ventilation system, and type I mechanical ventilation with Drivent Fan Unit System are selected for this study.