ACM Transactions on Programming Languages and Systems (TOPLAS)
Understanding and Using Context
Personal and Ubiquitous Computing
ITtalks: A Case Study in the Semantic Web and DAML+OIL
IEEE Intelligent Systems
Using Workflows to Coordinate Web Services in Pervasive Computing Environments
ICWS '04 Proceedings of the IEEE International Conference on Web Services
FollowMe: On Research of Pluggable Infrastructure for Context-Awareness
AINA '06 Proceedings of the 20th International Conference on Advanced Information Networking and Applications - Volume 01
Context-aware workflow language based on web services for ubiquitous computing
ICCSA'05 Proceedings of the 2005 international conference on Computational Science and Its Applications - Volume Part II
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Recently, the workflow systems such as uFlow and FollowMe adopt workflow models to support context-aware services in ubiquitous computing environments. A service in the ubiquitous computing environments must be executed according to a user's situation information, which is generated dynamically from sensors. However, the existing workflow systems use such workflow languages as uWDL, BPEL and XLANG, which are not yet enough to support context-aware services in ubiquitous computing environments. In this paper, we propose a new workflow language and a workflow system for context-aware workflow services in ubiquitous computing environments. With the suggested workflow language and the workflow system, a user can describe contexts into workflow as service transition conditions and can apply changes of user's service demand or situation information into an on-going workflow without interrupting or deleting workflow service. In order to verify the efficiency of the suggested language and system, we design a workflow scenario for context-aware services with the language and simulate a process that the proposed system changes dynamically contexts described in a workflow against changes of user's situation information.