PAN Haihong, bom in 1966. He received his Ph. D degrees in School of Mechanical Science & Engineering, Huazhong University of Science & Technology in 2007. He is an associate professor in College of Mechanical Engineering, Guangxi University. His current research interests include computer numerical control system, high-speed and high-precision motion control, and realtime embedded microcontroller application in semiconductor manufacturing equipment.To whom co rrespondence should be addressed. E-mail: hustphh@163.com