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Research on Information Extraction Based on Vertical Search Engine

Author: LiJianXiang
Tutor: ZhangJianPei
School: Harbin Engineering University
Course: Computer Software and Theory
Keywords: Vertical search engine Information Extraction Subject information Federated nodes Data area
CLC: TP391.3
Type: Master's thesis
Year: 2009
Downloads: 221
Quote: 1
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Abstract


In the information age , more and more access to information . Internet as an information carrier, in the dissemination of information capacity and efficiency aspects of irreplaceable position . But with the amount of information increases, users on the Internet to get the information you really need is becoming increasingly difficult . The emergence of search engines to improve the current situation , but users want to obtain specialized information is still not easy . Vertical search engine appears to solve this problem. In vertical search engine , structured information extraction technology is the vertical search engine is one of the key technologies . Wrapper -based information extraction information extraction technology is the main extraction techniques . In the wrapper generation process , the need for analysis and generate web pages for the extraction rules . In analyzing web pages extraneous \This paper presents the original wrapper generation model improvements . MDR algorithm is modified on the basis of the subject information extracted directly , only the topic information extraction rules in form . Pages need to extract topic information data-intensive to meet this prerequisite , as subject information in the extraction process, should subject the information area of each information extracted out of the tree structure . DOM tree through the entire page with the level of each node as compared with similar characteristics joint node node divided into a number of similar data area , extracting pieces of information constitute a simple tree structure. Then follow the wrapper method of extracting extraction rules to extract the tree structured information extraction rules . This method effectively removes the \Experimental results show that the method of packaging a certain extent, improved efficiency and generate extracted recall accuracy rate .

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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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