The Types Of Information-based Meta-search Engine Research

In recent years, the rapid growth of network information resource has made it more difficult for people to locate the information they need on network. As a result, developing Information Retrieval (IR) technology is very important in Internet field. Search engines sprung up in 1994, such as Lycos, Yahoo and so on, At present, Search engines has become one of the most popular network services on Internet.Single Search Engine which provides some service distributed in different fields still is applied widely because its completion is relatively easy, and was created too much since it first appeared. But it can' t keep up with current staggering development of Web with time passing by because its limited coverage and low efficiency. To change the condition, some of them turn the former method by which gathered a variety of information to another which just point the data of the specialized field. The innovation is very effective for clear or the specialized query. You can see that Specialized Search Engine gets high precision in some field just at expense of large retrieval coverage. Meta Search Engines by integrating them.According to the experts' investigation, average precision of numerous famous Search engine system is below 0. 45. In addition, it also puts good foundation to improve high precision because it can enlarge choice scope. So, users have to seek help for the other Search engines in order to get the more comprehensive, veracious retrieved information. The arise of Meta Search engine technique has solved this problem in a sense.When a query is submitted to a meta search engine, decisions are made with respect to the underlying search engines to be used, what modifications will be made to the query, and how to score the results.