Papers by Author: Chang Liu

Abstract: The regional technological innovation capability is an important standard to weigh the development of regional economies, and it also plays a crucial role in the growth and competition of the regional economies. As there is really quite a difference in the capacities of regional technical innovation, this paper first makes a principal component analysis (PCA) on the indexes of capacities of regional technical innovation by adopting MARLAB. Then, it clusters them based on extracted principal component scores and the results were analyzed. Through the discussion on clustering results, it could help us to improve the knowledge of regional economic unbalance and capacity of regional technical innovation

Abstract: This paper offers a robot calibration approach based on the virtual closed kinematic chain so that the absolute location accuracy of a robot can be improved. The calibration approach suggests that laser beam can be mounted on the robot’s end so as to form a virtual closed kinematic chain in the interest of enlarging the pose errors to proper extent, in this way straight line equations in space can be acquired when the robot positions are changed continuously, in the end the robots’ kinematic parameters can be figured out by genetic algorithm while measurement can be totally avoided in the calibration. Calibrating practices, simulating analysis and experiments on robots show that the approach can improve the absolute calibrating accuracy effectively.