8OPC data access automation interface standard: Version2.02. The OPC Fundadon, 1999: 17-22.
9SANDHU R COYNE E FEINSTEIN H [J],Role- based access control models,IEEE Transactions on Computers,1996(02).
10FERRAIOLO D F SANDHU R GAVRILA S A,Proposed NIST standard for role-based access control[J],ACM Transactions on In- formation and System Security,2001(03).
