Abstract:

Multi-granulation approach is a new analyzing model in rough set theory. To deal with the incomplete information system through the multi-granulation approach, on the basis of the similarity relation, multi-granulation rough set model based on set-valued information system is proposed, which includes optimistic and pessimistic cases. Moreover, not only the basic properties and measure relations of two kinds of multi-granulation rough sets are analyzed, but also the acquisition of decision rules is presented. Finally, this model is applied to risk judgment on security auditing of information systems, and it can provide decision support for effective judgment on security auditing of information systems.