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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.
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) 한국수산해양교육학회 2017 水産海洋敎育硏究 Vol.29 No.4
The structures used in the fields of fisheries, marine, machinery and aerospace are becoming larger, faster and more diversified. These structures have various shapes of tanks. Fuel, ballast, and fresh water tanks, which are present in vessels and marine structures including fishing vessels, are mostly in contact with fluids. In the fuel tank and fresh water tank, the level of the liquid in the tank is changed due to the operation of the ship, and the ballast tank is ballasted to maintain the equilibrium of the ship according to the load condition of the cargo. It is reported that such a tank may cause a resonance phenomenon due to an excitation force caused by operation of an engine, a propeller, a wave, and a ship auxiliary device, and cracks and breakage are caused by fatigue damage. Therefore, it is important to accurately estimate the vibration characteristics of these tanks in contact with the fluid. In this paper, the fluid - structure interaction problem is formulated by using the finite element method for the structure of rectangular tank and the boundary element method for fluid. The vibration characteristics of the elastic plate composing the tank through the boundary condition and the thickness variation were investigated in a tank structure having a height relatively higher than the length and width. According to the results of the study, the natural frequencies are affected by the boundary condition and shape of the tank.
배성용(Sung-Yong BAE) 한국수산해양교육학회 2017 水産海洋敎育硏究 Vol.29 No.4
Recently, ship and marine structures are more complex and larger. Also the structure and equipment become electronic, it has an effect on economy according to the weight of ship. In order to produce such ships, new technology development is urgently required. In particular, there is a need to acquire technology through dynamic analysis as well as statistical techniques and interpretations to ensure structural safety. Dynamically, it is necessary not only to global analysis that assumes the ship as a single structure, but also to local analysis to partially analyze it assuming it is a complex structure. There exists various tanks which is filled with the substance like fuel, oil and clear water. So the natural frequency is getting lower through a fluid. Therefore, it is very important to control the vibration, and also it needs to know the characteristic of vibration at the first design phase. There exists various tanks in the ship and marine structure. It continues to be as vigorous as ever about the vibration characteristic of the various tanks, and we need to study the characteristic of vibration of the U-Type Anti-Rolling Tank(ART). The goal of this study is to find out the vibration characteristic of U-Type liquid tanks.
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; I<SUB>eff</SUB> depends on both the axial load P/(A<SUB>g</SUB>f<SUB>ck</SUB>) and the longitudinal reinforcement ratio A<SUB>st</SUB>/A<SUB>g</SUB>, so it is the conservative to use the effective stiffness I<SUB>eff</SUB> 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) 한국수산해양교육학회 2017 水産海洋敎育硏究 Vol.29 No.4
The shipbuilding industry has been in the process of becoming larger and faster. Vessels are made of complex structures and carry a wide variety of cargoes for long periods of time and generally have a long life of more than 30 years. Ships have tanks of various shapes such as fuel, ballast and fresh water tanks, and most of them are in contact with the liquid. The state of the liquid also causes a change in the water level due to the operation of the ship. It has been reported that a resonance, which causes fatigue damage and destruction due to excitation forces of an engine, a propeller, and a wave. Therefore, it is considered important to clearly understand the vibration characteristics of these various tanks in contact with the liquid. Many vessels currently are equipped with many square shaped tanks and have various conditions of the boundary as well as various ratios of length, width and height of the tanks. Therefore, in this paper, the vibration characteristics of the elastic plate composing the tank through the changes of the boundary condition, the width and the thickness are investigated in a tank structure which is relatively higher than the length and width.