**Author details**

Jing Xin1 \*, Xing Du<sup>1</sup> , Yaqian Shi1 , Jian Zhang<sup>2</sup> and Ding Liu<sup>1</sup>

\*Address all correspondence to: xinj@xaut.edu.cn

1 Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing, Xi'an University of Technology, Xi'an, P.R. China

2 Faculty of Engineering and Information Technology, University of Technology (UTS), Sydney, Australia
