基金supported by the National Natural Science Foundation of China(Grant Nos.71471075,11501373,11701380)2015 Scientific Research Project of Shaoguan University(Grant No.S201501017)。
基金supported by the High-Level Personnel Fund of Xiamen University of Technology(Grant No.YKJ15031R)the Graduate Innovation Fund of Shanghai University of Finance and Economics(Grant No.CXJJ-2013-459)