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수직 벽 이착륙 및 이동이 가능한 드론의 설계 및 제어기 개발
배성용(Sung-Yong Bae),김승훈(Seung-Hun Kim),김지환(Ji-Hwan Kim),최현수(Hyun-Su Choi),조천용(Chun-Yong Cho),이동환(Dong-Hwan Lee),김동환(Dong Hwan KIm) 제어로봇시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.12
This paper describes the development of a drone design and controller capable of landing and driving on the outer wall of a building, delivering the object to the target location and after completing the mission, then taking off from the outer wall and reflying. It suggests a solution that can fulfill a mission even in the windy conditions, which is the biggest weakness of the drone. Four motors and wheels are located on the drone’s body to drive on the wall, and the damper was designed based on impact analysis. To avoid interference with the wheels, brushless DC (BLDC) motors are installed at the bottom of the drone, and propeller guards are designed to prevent collisions with the wall. The thrust must be specially controlled to attach this drone to the wall and to take it off the wall.
배성용(SUNG-YONG BAE) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.3
It is generally known that the concrete structure subjected to severe environment is much affected by the corrosion of reinforcement, the freezing and thawing action of concrete structure. The main objective of this study is to investigate the freezing and thawing resistance of concrete including fly ash. The effect of the air content in concrete using fly ash is investigated. The experimental study is conducted for 10 mix-ratio cases of concrete of which variables are content of fly ash concrete compressive strength and containment of air-entrained admixtures. Test results show that the freezing and thawing resistance improves as the amounts of fly ash increase, and concrete with air-entrained admixtures has good freezing and thawing resistance. The concrete with fly ash is to be included air-entrained admixture according to content of fly ash in order to increase the freezing and thawing resistance.
철근콘크리트 원형단면교각의 횡방향철근량에 관한 설계비교
배성용(SUNG YONG BAE),곽동일(DONG IL KWAK),김희덕(HEE DUCK KIM) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.1
This paper is conducted to compare the seismic design standard of a bridge column such as the Korean Bridge Design Standard(KBDS), EC 8, NZS 3101 and ATC 32. The KBDS adopted the seismic design requirements in 1992. The earthquake magnitude in Korea is compared with those in the west coast of the USA. It may be said that the current seismic design requirements of the KBDS provides design results, that are too conservative especially for transverse reinforcement details and amounts in reinforced concrete columns. This fact usually creates construction problems in concrete casting, due to congestion of transverse reinforcement. Furthermore, the effective stiffness; Ieff depends on both the axial load P/(Agfck) and the longitudinal reinforcement ratio Ast/Ag, so it is the conservative to use the effective stiffness Ieff than the gross section stiffness Ig. Seismic design for the transverse reinforcement content of the concrete column was analyzed and considered to have an extreme-fiber compression strain, response modification factor, axial load and effective stiffness etc.
배성용(SUNG-YONG BAE) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.3
The main objectives of this study are to carried out in order to evaluate strength development of Fly Ash concrete containing various amounts of Fly Ash such as 0%, 10%, 20% and 30%. The experimental variables included in this test program consist of content of Fly Ash, concrete strength and chemical activation. As Fly Ash content increases, air content, strength development of concrete and slump loss of normal strength concrete were gradually decreased The inclusion of Na₂SO₄ increased the short-term strength of concrete that contains Fly Ash In addition, the strength development of concrete that contains Fly Ash and Na₂SO₄ were improved.