基于本体的数据库元有哪些信誉好的足球投注网站引擎域映射_英文_.pdfVIP

Journal of SoutheastUniversity (English Edition) V o.l 23, No. 3, pp. 357 360 Sept. 2007 ISSN 1003) 7985 Domain semanticmapping of databasem etasearch engine 1 2 M iao Guangxiang ChenX iangyang 1 ( B aoding Technical College of Electric Pow er, Baod ing 071051, Ch ina) 2 ( College of M athem atics and Com puter, H ebeiU niversity, B aod ing 071002, Ch ina) Abstract: In order to mi plem ent sem anticm apping of databasem etasearch engines, a system is proposed, w hich uses ontology as the organization form of inform ation and records the new w ordsnot appearing in the ontology. W hen the new w ordøs frequency of use exceeds the threshold, it is added into the ontology. Ontology expansion is mi plem ented in thisw ay. The search process supports ÷andù and ÷orù Boolean operations accordingly. In order to mi prove them apping speed of the system, am emorymodule is addedw hich can m emorize the recent query inform ation of users and autom atically learn the userøs query interest during the m apping w hich can dynam ically decide the search order of instances tables. Expermi ents prove that these m easures can obviously reduce the averagem apping tmi e. Key words: ontology; dom ain m apping; databasem etasearch engine; m emory module W ith the increase in web resources, various search How ever, since users do not know to w hich dom ain the engines have appeared in order to mi prove the efficien query product belongs and that even for the same do cy of searching. A recent survey indicates that there are