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정상화(S. H. Jeong),이경형(K. H. Lee),차경래(K. R. Cha),김현욱(H. U. Kim),최석봉(S. B. Choi),김광호(G. H. Kim),박준호(J. H. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
As optical fiber communication grows, the fiber alignment become the focus of industrial attention. This greatly influence the overall production rates for the opto-electric products. We proposed multi-axis nano positioning stage for optical fiber alignment. This device has 3 DOF translation and sub nanometer resolution. This nano stage consist of 3 PZT-driven flexure stages which are stacked parallel. The displacement of it is measured with capacitance gauge and is controlled by computer-embedded main controller. The design process of flexure stage using FEM is proposed and the performance evaluation of this system is verified with experiments.
비직교 다중접속을 위한 딥러닝 기반의 다차원 변조 신호점 설계
서한창(Hanchang Seo),한민식(Minsig Han),강충구(Chung G. Kang) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.11
본 논문은 autoencoder 를 활용하여 최적화된 resource 맵핑 과 constellation 맵핑을 수행하는 새로운 code domain-NOMA 방식을 제안한다. 지금까지 고려되지 않은 새로운 구조의 autoencoder를 제안하여 minimum Euclidean 거리를 최대화하는 최적화된 다차원 심볼을 생성하도록 종단간학습(end-to-end learning)을 수행하고, 다중 사용자의 다차원 신호점에 대해서 복호화를 수행한다. 제안한 방식에 의해 10-3 의 비트오류 성능이 기존 SCMA 방식보다 4.5dB 이상 D-SCMA [2]보다 2.7dB 향상되는 것을 시뮬레이션을 통해 확인하였다.
정상화(S. H. Jeong),김현욱(H. U. Kim),최석봉(S. B. Choi),박준호(J. H. Park),김광호(G. H. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In recent years, as the robot technology is developed, the researches on the artificial muscle actuator that enable robot to move dexterously like biological organ become active. The widely used materials for artificial muscle are the shape memory alloy and the electro-active polymer. These actuators have the higher energy density than the electro-mechanical actuator such as motor. However, there are some drawbacks for actuator. SMA has the hysterical dynamic characteristics. In this paper, the simulation of anthropomophic robotic hand is performed using ADAMS and the segmented binary control for reducing the hysteresis of SMA is proposed. SMA is controlled by thermo-electric module. The relations between the force and the hysteresis are developed to verify the validity of the suggested method.