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김영수(Youngsoo Kim),이덕규(Duck-Gyu Lee),정영도(Youngdo Jung),정연도(Yeon Do Jeong),이준희(Junhee Lee),이성휘(Sung Hwi Lee),김완두(Wan-Doo Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We proposed a new expandable drilling tool that allows us to make a bottle-shape pressure well. The expansion of internal cavities has increased the area of air exposure in landfills, resulting in increased volume flow rates of airflow. Also, installation time could be significantly saved due to one step installation of air pipe.