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XIA Xintao and WANG Zhongyu

1 College of Mechatronical Engineering, Henan University of Science and Technology, Luoyang 471003, China
2 College of Instrumental Science and Optoelectronics Engineering, Beijing University of Aeronautics and Astronautics,
Beijing 100191, China

Received April 22, 2008; revised December 22, 2008; accepted February 4, 2009; published electronically February 6, 2009

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