国家自然科学基金71102143;教育部人文社会科学研究青年基金15YJC630159;南京工业大学经济与管理学院“1611人才强院工程”资助项目 Supported by the National Natural Science Foundation of China71102143;the Youth Foundation of Humanity and Social Sciences Research of Ministry of Education15YJC630159;the Fund Project of "1611 Program Promoting School with Talent" of School of Economics and Management of Nanjing Tech University