• Journal of Biosystems Engineering
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• 제24권3호
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• pp.209-216
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• 1999

A self-travelling sprayer was developed to avoid the exposure of an operator to agricultural chemicals and exhaust gas, to improve safety and to increase working efficiency during the application and transport work in the greenhouses. This system consists of self-travelling system and the control system for application and safety device. The auto-spray car is equipped with a liquid chemical tank of 80l capacity. The travelling system adopted mechanical steering system which link mechanism of front wheel is guided by guide rollers. The sprayer travels along the guiding pipe which is set on the furrow in the greenhouses. The sprayer stops automatically applying and traveling when the liquid chemical tank becomes empty or when the sprayer reach the turning point. The spray booms swings in a vertical plane. The control system of safety devices controls the automatic stop of the sprayer when there is an obstacle on the traveling path, or when the battery becomes discharged. The auto-spray car traveled smoothly and steadily along the guide pipe during traveling straightly and turning on the ground.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.210-215
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• 2000

Presently, one or several tugboats guide a ship in the port or canal, during the ship's engines and steering mechanism kept idle. This method has insufficient ability keeping the ship on course, danger of collision with waterside structures, tugging preparation time consuming, as well as the need expending substantial resources to acquire and maintain tugboats and associated facilities. Therefore, a new technology and system for ship's guiding to be needed and introduced instead of traditional guiding and tugging system.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2001년도 학술대회지
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• pp.222-227
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• 2001

고층 건축물에 사용할 CFT 기둥에 적합한 고유동 콘크리트를 개발하고, 이를 적용하여 실물대의 Mockup 실험을 진행하여 시공시 문제점 및 관리기술을 확보하고자 하였다. 사전에 재료선정실험을 진행하여 CFT 기둥에 가장 적합한 재료를 선정하고, 시공성을 향상시키기 위하여 2단계에 걸쳐 실험을 진행하였다. 1차 실험에서는 타설방법, 유도관의 유무, 타선속도, 낙하높이 등을 변수로 실험을 진행하여 그중 시공성이 우수하면서 품질관리에 문제가 없는 변수를 대상으로 2차 실험을 진행하였다 2차 실험에서는 $9.6{\cal}m$ 높이의 강관에 타설방법을 달리하여 콘크리트 충전실험을 진행하였다. 실험결과 시공성 향상을 위하여 기존의 시공지침과 차이를 가진 변수에서도 우수한 충전성능을 보임을 확인하였다.