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정동교,유수창 群山大學校基礎科學硏究所 1994 基礎科學硏究 Vol.9 No.-
The effect of drinking water on the oxidation of glutathione has been investigated for the first time using a UV/vis absorption spectroscopy. The homogenized rabbit liver which contains plenty of glutathione was incubated with CDNB in water picked from nine different sources, and thereafter the residual glutathione was determined in each case. The experimental results showed that the amount of residual glutathione in tap water was 57% and 71% of that in buffer solution and underground water, respectively. The fact that drinking water may cause cancer is addressed on the basis of the experimental results.
Point Cloud 기반의 Neural Network를 이용한 그리퍼의 최적 파지점 추출 알고리즘 연구
정동교(Dongkyo Jeong),김동언(Dongeon Kim),이승현(Seunghyeon Lee),이장명(Jang-Myung Lee) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.1
In this paper, the optimal griping point learning is conducted through the neural network with the input of point cloud data. The SG-DNN (Stable Grasping-Deep Neural Network) algorithm, which was applied only to the shapes classified as the “original type”, is extended to the real object and additionally composed of cost functions. Through this, a study was conducted to extract the optimal point for stable griping. Griping objects were simplified and limited to 10 types of shapes in the SG-DNN algorithm, and 4 cost functions were designed accordingly in order to extract the optimal griping point. However, when applying the method for an actual object, there was a limitation in deriving the optimal griping point. The content of the text uses a sample extracted from coordinate points through the point cloud data of a real object as the input of the neural network model. In comparison to the conventional method, a learning data set including dense surface area coordinates is constructed, leading to the extraction of a precise gripping point. The cost function was supplemented with cost functions for height, width, and rotation, and was designed to fit the actual object while including the cost function for the mass center according to the material and the gripper depth. The performance of the algorithm was verified by griping experiments involving real objects.
위상동기루프 방식을 이용한 고빈도 진동환기 장치의 설계
이상학,정동교,이준하,이관호,김영조,정재천,이현우,이석강,이태숙 영남대학교 의과대학 1989 Yeungnam University Journal of Medicine Vol.6 No.2
In this study, high frequency oscillatory ventilator was designed and constructed. Using designed by phase-lock loop system, in order to accurately and easily treat both the outlet volume and rpm. A system has been designed and is being evaluated using CD4046A PLL IC. We use this PLL IC for the purpose of motor controls. The device consists of PLL system, pumping mechanism, piston, cylinder, and special crank shaft are required. This system characteristics were as follows: 1) Frequency : 20-1800rpm 2) Outlet air volume : 1-50cc