Since 1999, she has worked in many areas of federated query compilation, including query semantics, query rewrite, pushdown analysis and query optimization 從1999開始,她從事過聯(lián)邦查詢編譯的很多領(lǐng)域,包括查詢語義、查詢重寫、下推分析和查詢優(yōu)化。
A fuzzy image data model and a concept of fuzzy space are proposed, in which model visual feature, spatial feature and semantic feature are used for super feature in order to utilize advantage of traditional relation database as well as characteristics of image data and fuzzy retrieval . based fuzzy space, a method of similarity measurement of image is presented to support fuzzy features-based image retrieval and satisfy user's query requirement for image . in the thesis, a semantic template and the mechanism of dynamic relevant feedback are defined so that it can express user's query semantic and improve retrieval precision and useable capability for image retrieval 研究了模糊檢索方法和相關(guān)反饋機(jī)制在圖象檢索中的應(yīng)用,提出了一種模糊圖象數(shù)據(jù)模型和模糊空間的概念,該模型將可視特征、空間特征、語義特征看作超屬性,既充分利用了傳統(tǒng)關(guān)系數(shù)據(jù)庫的優(yōu)點(diǎn),同時(shí)又考慮了圖象數(shù)據(jù)以及模糊查詢的特點(diǎn),文中提出的模糊空間和模糊相似性度量方法能支持基于模糊特征的圖象查詢,較好地體現(xiàn)用戶圖象查詢的應(yīng)用需求,文中定義的語義模板和相關(guān)反饋機(jī)制能在一定程度上表達(dá)用戶的查詢語義,提高圖象檢索的準(zhǔn)確率和易用性。