[1] Jiangsu Univ Sci & Technol, Coll Econ & Management, Zhenjiang 212003, Jiangsu, Peoples R China
[2] Missouri Univ Sci & Technol, Dept Elect & Comp Engn, Rolla, MO 65409 USA
[3] Yangzhou Univ, Coll Math Sci, Yangzhou 225002, Jiangsu, Peoples R China