1NF模糊时态数据库数据模型  

A Conception Model of Fuzzy Temporal Database

作　　者：邓立国[1] 杨殊[2] 边丽英[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004 [2]沈阳师范大学软件学院,辽宁沈阳110034

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第3期503-507,511,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：教育部新世纪优秀人才支持计划(NCET-05-0288)

摘　　要：目的建立INF(一范式)模糊时态数据库数据模型,以便能有效地表达复杂的模糊时态信息.方法结合模糊时态序列和模糊集理论对Allen定义的时态区间进行模糊性扩展,建立模糊时态关系模型.基于该模型,对传统数据库及时态数据库的概念模型进行模糊时态约束扩展和数据的模糊化,提出模糊/时态关系代数映射及运算模型.结果从理论上阐述了模糊时态数据模型,引入了模糊映射,把事件的模糊性投影到不确定的时态信息上.结论该模型的建立在一定程度上解决了时态数据库不能处理模糊时态信息,丰富了时态数据库查询语言,从而增强了时态数据库模拟现实世界的能力.In order to effectively express complex fuzzy temporal information, the establishment 1NF of a fuzzy temporal databases datum model. The aim of this work is to integrate the ideas of fuzzy temporal sequence and fuzzy set theory into Allen＇s interval-based temporal logic, defining a new formalism which extends classical temporal interval model for fuzzy temporal interval relations. Based on the model, some results obtained in the framework of fuzzy temporal constraints and the expansion of the fuzzy data are used in the specific concept of the traditional database and temporal database modeling. The established model of fuzzy/ temporal allows the user to construct his fuzzy temporal relational algebra mapping intuitively and to choose different retrieval threshold values for fuzzy information. The establishment of the model to a certain extent solved the temporal database can not handle fuzzy temporal information, enriching the temporal database query language, thus increasing the ability of temporal database to simulate real world.

关 键 词：模糊时态数据库 不确定 模糊集 数据模型 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]