分散式模糊關聯資料庫之模糊功能相依

Fuzzy Functional Dependency on Distributed Fuzzy Relational Databases

張資昊(Tsu-Hao Chang)

指導教授 ： 劉俞志

元智大學/資訊學院/資訊管理學系/碩士(2003年)

摘要

模糊功能相依不僅是模糊正規化或不失真分解的依據，亦可輔助推估屬性中缺值的可能範圍值、找尋資料探勘中特徵屬性以及判斷實體化視域之切割屬性。由於模糊功能相依取決於模糊資料庫的資料內容，欲討論分散式模糊關聯資料庫之模糊功能相依，需先考量資料整合之問題。傳統關聯式資料庫的資料整合問題，已相被完整探討，然而模糊關聯資料庫的資料整合問題卻鮮少被觸及。本文首先探討模糊關聯資料庫的資料整合相較於傳統資料庫之困難點，並分析各模糊資料模式之異質性，針對每一個造成模糊關聯資料庫異質性之因素，提出資料整合方法。最後，對分散式資料庫提出關聯表之整合方式，以及快速搜尋模糊功能相依之方法。

關鍵字

資料整合 ； 模糊關聯資料庫 ； 歸屬函數 ； 相似度計算 ； 模糊功能相依性

並列摘要

Fuzzy functional dependency is the basis of normalization and lossless decomposition. Furthermore, it can be used to derive the range of the missing value, detect the feature attribute value in data mining, and decide the contradictory fragment in the selection of materialized view. The data integration is the prerequisite for the issue of fuzzy functional dependency in distributed fuzzy databases. In the context of classical databases, the data integrations of databases have been studied well. However none of them consider the data integration of Fuzzy Relational Databases. This paper first discusses the difficulty of the data integration in fuzzy databases compare to the classical databases, and analyzes the heterogeneity of various fuzzy data models. Second, the methods to integrate the models have been proposed. Finally, the method of combining relations as well as searching fuzzy functional dependencies (ffds) in the distributed fuzzy databases will be presented. The result of this research will contribute towards the advance of the theory in Fuzzy Databases.

並列關鍵字

data integration ； fuzzy relational databases ； membership function ； semantic measure ； fuzzy functional dependency

參考文獻

[21] Tsu Hao Chang and Julie Yu-Chih Liu, “On the Membership

[23] Yu-Chih Liu and Tsu Hao Chang, “The Compatible Parameters

Heidelberg Physica -Verlag, 1999.

[2] Baldwin JF and Zhou SQ, “A Fuzzy Relational Inference

Data for Relational Databases”, Fuzzy Sets and Systems, 5,