期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2006
卷号：6
期号：9A
页码：97-101
出版社：International Journal of Computer Science and Network Security
摘要：The depiction of indeterminate temporal and atemporal data is important to obtain a suitable model of database management systems. This paper presents a formal relation model, called ITRM (Indeterminate Temporal Relation Model), for the representation, manipulation and query of indeterminate information. Moreover, indeterminate time interval is classified and temporal relation algebra operators are extended. All the operations of the algebra are defined and are proved to be closed. The given examples show that the ITRM model can efficiently represent indeterminate data.
关键词：Indeterminacy, ITRM, Time interval, Temporal relational algebra operator
