教育部人文社科规划基金项目12YJA790065;湖南省软科学研究重点项目2013ZK2002;湖南省社科基金项目08YBB042.the Foundation for the Development of Humanities and Social Sciences of Ministry of Education12YJA790065;Major Program of Soft Science of Hunan Province2013ZK2002;Social Science Foundation of Hunan Province08YBB042