Dissertation > Excellent graduate degree dissertation topics show

Knowledge Service Platform and Passage Retrieval

Author: HuangZuo
Tutor: WangXiaoLong
School: Harbin Institute of Technology
Course: Computer Science and Technology
Keywords: knowledge service knowledge service platform passage retrieval passage retrieval evaluation indicators
CLC: TP391.3
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 0
Read: Download Dissertation

Abstract


A great deal of information are distributed on the Internet with various forms,how to find comprehensive and accurate information has always been the goal ofmany network applications. Search engines could satisfy users’information need insome certain degree by implementing simple key words for retrieval. However,information need itself is usually too complicated to be expressed with words,sentences or even paragraphs. In real world, some means such as classification andcomparison could help people find out what they really want, which is unavailablefor search engines. In the traditional search engine, we always use the keywords asthe content of the query but not to meet the user large grained requirements.Itbecame a hot topic to how to meet the user requirement in all face as much aspossible.The aim of this paper is to build the knowledge and information serviceplatform based on network information integration. Then discuss the passageretrieval which is the part of the machine auto service. The work of this paperinclude:1. The paper proposes a concept of knowledge and information service.Knowledge and information service, not only include information service,information retrieval, but also include increasing knowledge value., providing theplace for communication, knowledge innovation, then build the platform forswitching between the network information and knowledge, in order to provide aconvenient for information retrieval, learning knowledge and expressing personalviews.2. We exponded the methods of network information. We use the Naturallanguage processing technology to collect network information, then classify andarrange it. As a result of these processing, the network information become orderlyand useful. Face the different user requirement. They will be make the networkinformation more useful.3. In this paper, we exponded the algorithem and technology in passageretrieval. We improved the old keyword search engine to meet the user largegrained requirements. We used window-fixed partition to divid the document in the library into many passages, used TF/IDF to select several keyword represent thequery,sorted them according their weights, then used the permutations of them toretrieval in the document library. User will get the result documents which includesimilary passages. In this paper, it tried two methods while passage patition:Window-fixed-no-overlap partition and Window-fixed-overlap partition, then useexperiment to compare them. In the experiment, Window-fixed-no-overlap will useless retrieval time, though its paraghraph accuacy is lower a little than Windowfixed-overlap partition. When permutate the keywords, it also use two differentmethods: 5 keywords permutation and 10 keywords permutation according topriority, and use experiment to compare them. In the comparision, we discovered, 5keywords permutation get less retrival time, while 10 keywords permutationaccording to priorty get more result documents.4. We give the evaluation indicators for passage retrieval. The paper proposedthe concept of paragraph accuracy and paragragh recall. Two indexes aboveevaluate the ability of the similar passages retrieval and the suspected plagiarismparagraph detection. Because of its grained requery, the timeliness is one of theimportant evaluation indicators.

Related Dissertations

  1. Passage Retrieval System and Its Application,TP391.3
  2. Research on Relevance Ranking,TP391.3
  3. Concept and Passage Retrieval for Knowledge Discovery from Biomedical Literature,G354
  4. Based on Latent Semantic Analysis About the University Chinese question answering system,TP18
  5. Research and Implementation of Question Answering System for Biomedical Domain,TP311.52
  6. Restricted domain Chinese question answering system answer extraction,TP391.1
  7. Research on Information Distance Theory and Its Application in Question Answering System,TP18
  8. Research of Passage Retrieval for Question Answering Systems,TP391.3
  9. Research on Knowledge Services Modeling Methods for C2 Organizations in Network Centric Warfare,E91
  10. An Application Study on Digital Reference in N University Library,G258.6
  11. Knowledge Service of University Library,G252
  12. The Research of Library Information Ecosystem Based on Knowledge Service,G258.6
  13. Design and Implementation of Cluster Web Content Management System Based on Knowledge Service,TP393.092
  14. Knowledge in the process of rural information service model,F320.1
  15. Improvement of Knowledge Service Process for HUB Team,F272.92
  16. A Research on the Application of Agricultural University Libraries into the Agricultural Knowledge Service,G258.6
  17. Interactive Development Research between Knowledge Services and Equipment Manufacturing of Shenyang,F427
  18. The Research of Personalized Knowledge Service Based on User Context Ontology,TP391.1
  19. The Design and Development of Remote Diagnositic Center Based on Kowledge Service for Marine Power System,TP277
  20. Study on Evaluating Knowledge Service Capability of Universities in Shanghai,G647

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Retrieval machine
© 2012 www.DissertationTopic.Net  Mobile