Abstract:

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.