利用P-集合(packet sets),介绍内P-数据、外P-数据、双P-数据概念;双P-数据由内P-数据与外P-数据共同构成;分析双P-数据动态特性。利用这些概念,描述双P-数据依赖与双P-数据依赖的同心圆定理,提出双P-数据恢复-辨识定理与双P-数据恢复-辨识准则,并给出应用。双P-数据恢复-辨识是信息系统中的一个新的研究领域,P-集合是这个研究领域中的一个新工具。
Based on the P-sets(packet sets),the concepts such as internal P-data,outer P-data and double P-data are proposed;double P-data are composed of internal P-data and outer P-data together;the dynamic characteristics of double P-data are given.By using these concepts,the double P-data dependency and its concentric circle theorem are given.The double P-data recovery-identification theorem and criterion as well as their applications are presented.The double P-data recovery-identification is a new research domain in information systems,and P-sets are a new tool in this domain.