The spatial period of grating image in Abbe-porter experiment is diseussed，inwhich the input is a grating-like object.

This paper firstly consider the Bertino’s work which introduce periodic time and temporal dependencies in DAC model, and then presents a permission delegation model PDACDM to support temporary constraints, temporal dependencies constraints and propagation constraints.

A weighted role for activating task and periodic time authorization is an unsolved major problem for the access control of a workflow management system (WfMS).

The traditional RBAC model cannot express time secure access control constraint,so proposed a new RBAC model with time character,in which defined a new concept of authorization based on periodic time.

The result is that the cycle time goes up andthe number of the work-in-process/WIP rockets up.

For nonautonomous and nonlinear DEDS with a state feedback, by introducing the maximum mergable subset of a strongly connected system, we define the partial merging assignment of cycle times and the stabilization, give a necessary and sufficient condition for the assignment and a sufficient condition for the stabilization.

Area problems of cycle time independent assignment of min-max systems using a state feedback is considered, and constitution ways of confirming the most important sub domains of systems assigned region is obtained, and an example is given.