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Crawler and Incremental Update Strategy Research in Deep Web

Author: GuoMei
Tutor: LiHui
School: Beijing University of Chemical Technology
Course: Applied Computer Technology
Keywords: Deep Web Vertical search Text Categorization Information extraction Incremental update
CLC: TP391.3
Type: Master's thesis
Year: 2010
Downloads: 188
Quote: 1
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Abstract


The 21st century based on a network -based , high-tech as the core of the knowledge-based economy , the network is increasingly important to our lives , more and more people start your research online , and now the user is becoming increasingly dependent on search engine , the search results \Deep Web compared with ordinary web pages , more informative , more specific theme , the data structured information better , higher quality of the information , and can effectively search the Deep Web resources , to provide users with more valuable information . Deep Web search needs to break through the limitations of traditional search technology , automatic identification searchable database from the network , submit a search request and return the query results were analyzed by the search interface , remove the required data processing and then returned in some form to the user. The spirit of the search for deeper , more professional information purposes , the text discusses the depth gateway key research to achieve the depth of the net vertical search system based on cloud computing . Internet mass disorder information structured to provide users with the monograph , specific , in-depth information retrieval services , the use of a simple model , text vector characteristics classification page accurately classified . The experimental results show that the method has the efficiency of web crawling and page classification accuracy . In addition, according to the different categories of URLs with different update algorithm to achieve incremental updates of the data . The experimental data show that this incremental updating algorithm is feasible, and dynamically updated as the Web , the system will be automatically updated each time automatically adjust the update frequency , the updated range automatically adjust .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Retrieval machine
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