单位根和协整及其结构突变的理论与应用研究摘要论文的摘要是对论文研究内容和成果的高度概括。摘要应对论文所研究的问题及其研究目的进行描述，对研究方法和过程进行简单介绍，对研究成果和所得结论进行概括。摘要应具有独立性和自明性，其内容应包含与论文全文同等量的主要信息。使读者即使不阅读全文，通过摘要就能了解论文的总体内容和主要成果。论文摘要的书写应力求精确、简明。切忌写成对论文书写内容进行提要的形式尤其要避免“第1章……；第2章……；……”这种或类似的陈述方式。关键词是为了文献标引工作、用以表示全文主要内容信息的单词或术语。关键词不超过5个，每个关键词中间用分号分隔。关键词：关键词1；关键词2；关键词3；关键词4；关键词5AbstractAnabstractofadissertationisasummaryandextractionofresearchworkandcontributions.Includedinanabstractshouldbedescriptionofresearchtopicandresearchobjective,briefintroductiontomethodologyandresearchprocess,andsummarizationofconclusionandcontributionsoftheresearch.Anabstractshouldbecharacterizedbyindependenceandclarityandcarryidenticalinformationwiththedissertation.Itshouldbesuchthatthegeneralideaandmajorcontributionsofthedissertationareconveyedwithoutreadingthedissertation.Anabstractshouldbeconciseandtothepoint.Itisamisunderstandingtomakeanabstractanoutlineofthedissertationandwords“thefirstchapter”,“thesecondchapter”andthelikeshouldbeavoidedintheabstract.Keywordsaretermsusedinadissertationforindexing,reflectingcoreinformationofthedissertation.Anabstractmaycontainamaximumof5keywords,withsemi-colonsusedinbetweentoseparateoneanother.Keywords:keyword1;keyword2;keyword3;keyword4;keyword5目录第1章引言..............................................................................................................11.1对等网络概述...................................................................................................21.1.1P2P简单发展历史回顾..............................................................................31.1.2P2P研究的关键问题..................................................................................41.2对等网络中的搜索技术..................................................................................51.2.1P2P搜索算法的分类和当前进展情况.....................................................51.2.2研究P2P中高效率、功能多样化的搜索算法之必要性.......................61.2.3P2P中信息搜索的困难和挑战.................................................................71.3本文研究的主要内容和主要贡献.................................................................81.3.1研究什么和不研究什么.............................................................................81.3.2各章内容简介............................................................................................101.3.3本文的主要贡献.......................................................................................12第2章相关工作....................................................................................................132.1对等网络基础设施........................................................................................132.1.1非结构化P2P系统与非收敛性路由......................................................132.1.2结构化P2P系统与收敛性路由..............................................................142.1.3P2P系统中的数据存放策略...................................................................162.2传统集中式环境中的信息搜索...................................................
