| So far, workflow model has been used widely in enterprises and the development of Internet technology provides convenient environment for its use, but severe competition between companies and instant change of commercial environment requires strong flexibility. Furthermore, many workflow models haven't managed the transferred data effectively, which causes that the data might be juggled and threatens the workflow model, even the entire workflow management system. In order to solve these problems researches on flexibility and integrity of workflow models are necessary for improving workflow models to meet actual requirements.Judged from current international researches on workflow models, there are still some problems as follows: firstly, many researchers promoted "secure workflow model" trying to control privileges of resources in workflow models, but it only ensured the integrity of static workflow models without dynamic control and wasn't applicable for dynamic workflow models; secondly, some researchers promoted "dynamic workflow" and dynamic modification strategies that implemented flexibility to some extent, but it didn't validate the workflow model after modification and couldn't ensure the correctness and integrity of new workflow models. Aiming at these defects this paper promotes dynamic modification strategy, integrity control strategy as well as dynamic and integrated secure model. Combined with these strategies, dynamic and integrated control model ensures the flexibility and integrity of workflow models at the same time.Main achievements of this paper could be concluded as follows:1) Based on researches about dynamic workflow and dynamic modification of workflow models, this paper promotes dynamic modification strategy of workflow models.2) According to Role Based Access Control strategy, this paper ensures the integrity of workflow models with minimum privilege principle and duty separation rules.3) Combined with integrated and dynamic control of workflow models, this paper promotes dynamic and integrated control model in workflow management system and validates the correctness of workflow models with CPN Tools.4) Through researches on dynamic and integrated control model, this paper implements a prototype system which illuminates the feasibility of dynamic and integrated control model. |
