一种改进的概率关系模型及其应用研究  

An Improved Probabilistic Relational Model and Its Application

作　　者：李俊丽[1] 

机构地区：[1]晋中学院计算机科学与技术学院,山西榆次030600

出　　处：《中北大学学报（自然科学版）》2011年第2期169-173,共5页Journal of North University of China(Natural Science Edition)

摘　　要：为了解决概率关系模型(Probabilistic Relational Model,PRM)中投影不合理的缺点,针对PRM模型存在的缺陷对其进行了改进.把概率关系数据库中的元组进行了有效的划分,分为相互独立元组和互不相容元组,并且给出了改进后不同类型元组的投影操作.此外,在传统的房屋中介管理系统中应用了概率关系模型.该系统表明:增加概率属性之后的关系模型与之前的相比,数据的直观性增加了,程序的运行速度提高了.通过数据表可以形象地了解一条记录的特性,从而提高了工作效率.Some improvements were made to solve the unreasonable projection problem of PRM model by classifying the tuples of probabilistic relational database into two classes,independent tuples and incompatible ones,and the projections of the both classes were conducted.The PRM was applied in a real house-agency management system.This system provided more intuitive data and faster running speed of its program.The data table made the characteristics of a record better understandable.The working efficiency of the whole system was improved.

关 键 词：概率关系模型 元组 投影操作 

分 类 号：TP311.132[自动化与计算机技术—计算机软件与理论]