Fuzzy Extension Conceptual Model of Temporal Databases:Algebra Calculus
This paper present a fuzzy temporal data model for uncertainty/implicit events more precisely, and introduce fuzzy temporal complex event value relations, which combine the concept of fuzzy temporal relations with the idea of fuzzy temporal values in a uniform framework. We elaborate a model theoretic definition of fuzzy temporal information combination strategies, which has a rigorous foundation on fuzzy temporal theory. And then define an algebra for querying database instances, which comprises the operations of selection, projection, join, Cartesian product, union, intersection, and difference. We prove that our data model and algebra for fuzzy temporal values generalizes the classical relational data model and algebra. Moreover, we show that under certain assumptions, all our algebraic operations are tractable. We finally introduce the syntax/semantic of fuzzy temporal relations and describe the calculus of the fuzzy temporal algebra.
Liguo DENG Z.M. MA Gang ZHANG
College of Software , Shenyang Normal University, Shenyang, 110034, China College of Information Sc College of Information Science & Engineering, Northeastern University, Shenyang 110004,China College of Software , Shenyang University of Technology, Shenyang, 110023, China
国际会议
Fifth International Conference on Semantics,Knowledge and Grid(第五届语义、知识与网格国际会议 SKG 2009)
珠海
英文
302-305
2009-10-12（万方平台首次上网日期，不代表论文的发表时间）