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1 引言随着互联网的迅速发展和普及,人们对网络的依赖性越来越大,希望通过互联网获取所需的各种信息资源,以方便自己的学习和工作。为此,各种搜索引擎,如Yahool、Excite等相继诞生。然而,随着网络上的信息资源无论在数量上还是类型上都呈指数膨胀,搜索引擎也越来越难以为用户提供满意的服务。在这日益增多的海量数据资源中,搜索引擎查询出来的结果经常成千上万,良莠不齐,用户很难从中找到自己真正需要的信息,尽管这些查询结果满足了一类用户的需求,
1 Introduction With the rapid development and popularization of the Internet, people rely more and more on the Internet and hope to obtain all kinds of information resources needed through the Internet to facilitate their study and work. To this end, a variety of search engines, such as Yahool, Excite, etc. have been born. However, with the exponential expansion of information resources on the Internet both in number and type, it becomes increasingly difficult for search engines to provide users with satisfactory services. In this increasingly large amounts of data resources, search engine query often tens of thousands of results, good and bad, users find it difficult to find the information they really need, although these query results to meet the needs of a class of users,