Security Access Control Scheme for the Web Service based on Property;

The characteristics of private data exchange, varieties of user types, access authorization and authentication variation with market rules in electricity market demand flexibility and rigidity of security access control in electricity market operation system, which supports the operation of electricity market.

The paper, based on the perspective of database security, discussed the secure access mechanism and data backup protection mechanism of Oracle8i, as well as key issues in application.

A prototype for virtual disk s secure access and real-time monitor is designed and implemented.

The simulation modeling method by Task/Resource Graph is very advantageous to analyzing complicated discrete real-time systems due to its abundant time attributes, correspondingly, effect on schedulability by its tasks schedule algorithms and resource access control protocols will be very complicated.

At first, the Task/Resource Graph modeling method is briefly reviewed, and then task real-time schedule algorithms and resource access control protocols are addressed principally.

With the rapid economic development of society, the security issue of water resource becomes increasingly more conspicuous in areas with rich water resource.