Browsing by Author "Wang, F. -J."

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A Delegation Framework for Access Control in WfMS based on Tasks and Roles
(2008)
Jian, P.
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Hsu, H.-J.
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Wang, F. -J.
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資訊工程學系
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Department of Computer Science
Access control is important for protecting the information integrities in WfMS's. Compared to conventional access control models such as discretionary, mandatory, and role-based access control models, an access-control model based on both tasks and roles meets more requirements fir modern enterprise environments. However, there are no discussions on delegation mechanisms for such a model. In this paper, we propose a new delegation framework to support the access control associated with the model. Among various delegations, two typical cases and their solution algorithms, are presented to indicate the usability of the framework.
Analysing inaccurate artifact usages in workflow specifications
(2007-10-01)
Hsu, C. -L.
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Wang, F. -J.
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資訊工程學系
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Department of Computer Science
Although many workflow models have been proposed, analyses on artifacts are seldom discussed. A workflow application with well structured and adequate resources may still fail or yield unexpected results in execution due to inaccurate artifact manipulation, for example, inconsistency between data flow and control flow, or contradictions between artifact operations. Thus, artifact analysis is very important since activities cannot be executed properly without accurate information. This paper presents a three-layer workflow model for designing a workflow and characterises the behaviour of an artifact by its state transition diagram. By abstracting common usages of artifacts, six types of inaccurate artifact usage affecting workflow execution are identified and a set of algorithms to detect these inaccurate usages in workflow specifications is presented. An example is demonstrated and then related works are compared.