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이온층 에피택시법을 이용한 ZnO/Zn(OH)<sub>2</sub> 나노시트의 합성
정규현,남동현,류경희,Jeong, Gyu Hyun,Nam, Dong Hyun,Ryu, Gyeong Hee 한국재료학회 2022 한국재료학회지 Vol.32 No.3
ZnO nanosheets have been used for many devices and antibacterial materials with wide bandgap and high crystallinity. Among the many methods for synthesizing ZnO nanostructures, we report the synthesis of ZnO/Zn(OH)<sub>2</sub> nanosheets using the ionic layer epitaxy method, which is a newly-developed bottom-up technique that allows the shape and thickness of ZnO/Zn(OH)<sub>2</sub> nanosheets to be controlled by temperature and time of synthesis. Results were analyzed by scanning electron microscopy and atomic force microscopy. The physical and chemical information and structural characteristics of ZnO/Zn(OH)2 nanosheets were compared by X-ray photoelectron spectroscopy and X-ray diffraction patterns after various post-treatment processes. The crystallinity of the ZnO/Zn(OH)<sub>2</sub> nanosheets was confirmed using scanning transmission electron microscopy. This study presents details of the control of the size and thickness of synthesized ZnO/Zn(OH)<sub>2</sub> nanosheets with atomic layers.
기계 부품의 조립분해 작업을 위한 로봇핸드 그리퍼 설계 및 견실제어에 관한 연구
정규현(Gyu-Hyun Jeong),신기수(Gi-Su Shin),노연국(Yeon-Guk Noh),문병갑(Byeong-Gap Moon),윤병석(Byeong-Seok Yoon),배호영(Ho-Young Bae),김민성(Min-Seong Kim),한성현(Sung-Hyun Han) 한국산업융합학회 2017 한국산업융합학회 논문집 Vol.20 No.4
This study proposes a new technique to design and control of robot hand gripper for assembling and disassembling of a machine parts. The motion equation describing dynamics of the manipulators and object together with geometric constraint is formulated by Lagrange-Euler’s equation. And the problems of controlling both the grasping force and the rotation angle of the grasped object under the constraints are analyzed. The effect of geometric constraints and a method of computer simulation for overall system is verified. Finally, it is illustrated that even in case of there exists a sensory feedback from sensing data of the rotational angle of the object to command inputs control of joint and this feedback connection from sensing data to control grasping of machinery parts.