摘要
为了解决时态数据库对客观世界更符合实际抽象描述,能有效表示和处理复杂对象的模糊时态特性,从基本模糊时态数据模型入手,定义了一系列模糊时态关系操作元素,并论证了模糊时态区间关系代数的语法和语义,建立了一个能描述模糊时态信息的关系代数理论体系.避免了时态数据库不能提供表达模糊时态信息的环境设施,也增强了现有的时态数据库描述模糊事物特性的能力.
In order to resolve the temporal database more in line with the actual description of the abstract of the objective world, and that can effectively express and deal with complex object. By defining of a series of fuzzy temporal relation elements,we demonstrate the syntax and semantics of the fuzzy temporal relational algebra, and establish a fuzzy temporal relation algebraic theory of system in- fo base on basic fuzzy temporal data model. Which avoid deficiencies in the temporal database, provide facilities for modeling of fuzzy temporal aspect of datum, and also strengthen the existing temporal database the ability to describe the temporal characteristic of fuzzy events.
出处
《小型微型计算机系统》
CSCD
北大核心
2009年第12期2433-2438,共6页
Journal of Chinese Computer Systems
基金
国家自然科学基金项目(60873010)资助
关键词
时态数据库
关系代数
模糊时态数据库
模糊时态约束
语义
temporal databases
relational algebra
fuzzy temporal database
fuzzy temporal constraints
semantic
