排序方式: 共有17条查询结果,搜索用时 15 毫秒
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本文通过垂直搜索引擎的关键算法研究,论述垂直搜索引擎设计与实现时的一些独特的信息识别方法,包括Pagerank和HITS算法。 相似文献
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基于概念的权重PageRank改进算法 总被引:2,自引:0,他引:2
对比了基于链接分析的搜索引擎排序算法PageRank和HITS。针对原有PageRank算法采用的平分页面自身PageRank值的策略,提出了一种按权值分配的改进算法。权值由页面间的概念关联比重和用户的搜索概念确定。 相似文献
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本文以PageRank算法和HITS算法为例,对基于超链接分析技术的搜索引擎排序算法进行分析,并总结了超链接分析技术应用于搜索引擎结果排序的局限性。 相似文献
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Kleinbergs HITS algorithm (Kleinberg 1999), which was originally developed in a Web context, tries to infer the authoritativeness of a Web page in relation to a specific query using the structure of a subgraph of the Web graph, which is obtained considering this specific query. Recent applications of this algorithm in contexts far removed from that of Web searching (Bacchin, Ferro and Melucci 2002, Ng et al. 2001) inspired us to study the algorithm in the abstract, independently of its particular applications, trying to mathematically illuminate its behaviour. In the present paper we detail this theoretical analysis. The original work starts from the definition of a revised and more general version of the algorithm, which includes the classic one as a particular case. We perform an analysis of the structure of two particular matrices, essential to studying the behaviour of the algorithm, and we prove the convergence of the algorithm in the most general case, finding the analytic expression of the vectors to which it converges. Then we study the symmetry of the algorithm and prove the equivalence between the existence of symmetry and the independence from the order of execution of some basic operations on initial vectors. Finally, we expound some interesting consequences of our theoretical results.Supported in part by a grant from the Italian National Research Council (CNR) research project Technologies and Services for Enhanced Content Delivery. 相似文献
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Web spamming是指故意误导搜索引擎的行为,它使得一些页面的排序值比它的应有值更高.最近几年,随着web spam的急剧增加,使得搜索引擎的搜索结果也降低了一些等级.文章首先讨论了Spam的基本概念和影响,然后详细地分析了当前的各种Spamming技术,包括term spaming、link spamming和隐藏技术三种类型.我们相信本文的分析对于开发恰当的反措施是非常有用的. 相似文献
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基于Web超链接分析对当前存在的主流算法PageRank与HITS作了研究.主要讨论了PageRank算法存在评价下滑与评价泄漏的缺陷;简略介绍了HITS算法在主题相关度方面存在的问题;对上述缺陷做出了修正并提出了改进方向. 相似文献