Scenario-Specific Ontology-Based Query Expansion System

• Main Authors: Yeh-Shing Hou, 侯曄星
• Other Authors: Tzone-I Wang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/66895389654451725863

碩士 === 國立成功大學 === 工程科學系碩博士班 === 94 === To use keyword-based information retrieval is easy and convenient for users. However, such practice may not be able to retrieve documents with the same semantic as what the users really want, not to mention if the keywords entered are appropriate or not. Retrievals using rebuilt keywords according to specific ontology always result in documents meant to be. The common method used to date is to match keywords with concepts in the ontology first and then to infer relevant concepts also in the ontology before using all these concepts for retrieval. Those methods did not solve the problems where keywords entered do not match any concepts in the ontology. Two situations may happen, that is when keywords are not matched to concepts but to slots or relations in the ontology and when they even are not specified in the ontology. The situations are common when ontology is not renewed frequently enough. This thesis proposes an ontology-initiated scenario-specific query expansion system to solve these problems. The mechanism uses scenarios to replace the matching between concepts in the ontology and the keywords entered. The relation between two concepts in the ontology can be inferred, which regard this relation to rebuild the keyword. The user’s keyword can represent a specific scene, system find the fetch scenario to rebuild the keyword and output to user. Scenario query expansion system can find the relevant between unmatch keyword and the concept in ontology by user’s query. So when it is not a concept of ontology that the user's key word group has used, can make the proper response too.