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Modeling Workflow within Distributed Systems

Modeling Workflow within Distributed Systems. Yuhong Yan Flydragon Computer consulting,NY,USA Alex Bejan ANCA Tech. RI,USA Computer Supported Cooperative Work in Design, The Sixth International Conference on, 2001. Outline. Introduction

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Modeling Workflow within Distributed Systems

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  1. Modeling Workflow within Distributed Systems Yuhong Yan Flydragon Computer consulting,NY,USA Alex Bejan ANCA Tech. RI,USA Computer Supported Cooperative Work in Design, The Sixth International Conference on, 2001

  2. Outline • Introduction • Workflow Modeling Based on Petri Nets: State of Art • The Definition of Standard Workflow Network • Workflow Network Decomposition • Conclusion

  3. Introduction • The main purpose of a WFMS is the support of the definition, execution, registration and control of processes • Modeling business process is the start point of the workflow management techniques • The fact is that many WFMS’s modeling tools are paid less effort than the workflow engine

  4. Introduction (cont.) • Modeling tools drawbacks • No mathematical skills are used to analyze the properties of the processes • The current methods are not suitable in large scaled analysis • Consider the Petri Net as the modeling tools in this paper • We present the concept of Standard Workflow Structure and a set of standard workflow blocks • Also present the method of decomposing a large scaled workflow network into sub-networks

  5. Workflow Modeling Based on Petri Nets: State of Art

  6. Workflow Modeling Based on Petri Nets: State of Art

  7. Workflow Modeling Based on Petri Nets: State of Art

  8. The definition of Standard Workflow Networks • Observe of the illness structures of a workflow • In Figure1 following the source place are 2 Or-branches. No matter what branch is executed, the token is blocked in p2 or p5 because transition a3 can never be triggered

  9. The definition of Standard Workflow Networks

  10. The definition of Standard Workflow Networks

  11. The definition of Standard Workflow Networks

  12. The definition of Standard Workflow Networks

  13. The definition of Standard Workflow Networks

  14. The definition of Standard Workflow Networks • A SWF-net has the following properties • A SWF-net is bounded • A SWF-net is live • A SWF-net is sound

  15. Workflow Network Decomposition • Figure 3 is the whole Petri Net model • To decompose a network: • How to divide the whole network • How to build the synchronous relation between sub-networks • The properties of the sub-networks

  16. Workflow Network Decomposition • How to divide the network • Have to add new start and end places • Adding start and end places under the different sub-network situations • How to synchronize different sub-networks • From figure, we can see the CA controls the start of the SA at a1, while SA controls which branch of the 2 Or-connected branches in CA.

  17. Workflow Network Decomposition

  18. Workflow Network Decomposition

  19. Workflow Network Decomposition

  20. Conclusion • This paper presents a set of methods for modeling large-scaled workflow network • The soundness of single workflow net and the joint workflow net can be guaranteed • Not suitable in analyzing the undetermined relationships • Self-loop connection might be only one control relation between sub networks

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