In interpreting the meanings of words and phrases,though it is not suggested to follow rigidly the definition rules of logic,logic,for its great thinking power,is certainly of help to the intepretation of words and pharses.

On base of RBAC and D-S evidence theory,the access of database can be controlled and the security of core network user database can be enhanced by combining self-defined rules and using the audit function inner Oracle database.

Focusing on the requirement of Command Decision Model of campaign-level combat simulation, a new modeling method-Command Decision Modeling Method was given based on prearranged command regulation.