·············· 55 第五章论文的主要贡献、研究不足与展望····································· 57 第一节主要贡献与研究不足····································································· 57 一、论文的主要贡献··············································································· 57 二、研究的不足····················································································· 57 第二节未来研究展望·············································································· 58 参考文献·················································································· 60 在读期间科研成果······································································ 62 附录························································································ 64 致谢························································································ 72