An Improved Shark-Search Algorithm Based on Multi-information

With the enormous growth of world wide web, existing general-purpose search engines have presented much more limitations. Focused crawling is increasingly seen as a potential solution. The key of focused crawling is how to accurately predict the relevance of the unvisited web pages pointed to by known URLs to a given topic. A formalized description of the predicting process is introduced. Then, four policies are proposed to predict the relevance of unvisited pages to a topic. Further the combinations of these policies are used to improve the Shark-Search, which is a classic focused crawling algorithm mainly based on the textual information of Web pages. A large number of experiments were carried out to identify the optimized combination and verify that the improved Shark-Search is more effective than the original one.