1. Intelligent Vehicle and Informatization Research Institute, School of Mechanical and Vehicle Engineering, LinYi Univ., P.O. Box 276000, LinYi, ShanDong, China.
2. Network Center, LinYi Univ., P.O. Box 276000, LinYi, ShanDong, China.
3. Shandong Lingong Construction Machinery Co. Ltd., P.O. Box 276000, LinYi, ShanDong, China.