【摘要】 <正> 1 引言从早期的ARPANet,到目前的Internet,互联网的技术与应用都在超常规飞速发展。互联网上的信息也越来越多,因此迫切要求一种信息检索工具。1991年,XWAIS提供了一个界面友好的信息搜索系统,但是这个系统要求很特殊的文件格式。在同一年出现了另外一个信息检索系统GOPHER,GOPHER一时成更多还原

【Abstract】 With the explosive increase of the network information,it is more and more difficult for people to look up information. The occurrence of the Web search engines overcomes this problem in some degree. However ,because different search engines use different mechanisms,scope and algorithms,the repetition of the search results for the same query is no more than 34%. If wish to get relativly full-scale,accurate search results,multi-search engines should be used and the meta search engines occur. In this paper,the meta search engines are surveyed. At first,the history,the principles and the elements of the meta search engines are discussed. Then,the related creteria of the meta search engines are analyzed and several typical meta search engines are compared. Finally,on this base,the trend of the meta search engine is introduced.更多还原