ACM Transactions on Programming Languages and Systems (TOPLAS)
Understanding and Using Context
Personal and Ubiquitous Computing
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
Context-sensitive adaptation of workflows
Proceedings of the doctoral symposium for ESEC/FSE on Doctoral symposium
A middleware for a tabletop procedure-aware information display
Multimedia Tools and Applications
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Recently, there are many studies to adopt the workflow model, which has been successively applied to traditional computing environments, into ubiquitous computing environments for context-aware and autonomous services. A service in the ubiquitous computing environments must be executed according to a user's situation information, which is generated dynamically from sensors. However, such existing workflow systems as FollowMe and uFlow to support context-aware services through workflow models, can't immediately adopt changes of a user's situation into a already on-going service workflow. In this paper, we propose a context-aware workflow system, for ubiquitous computing environments, which can apply changes of user's service demand or situation information into an on-going workflow without breaking its operation. To do this, the proposed system represents contexts described in a workflow as a RDF-based DItree (Document Instance tree). The system uses the tree information to recognize a exact position to be changed in the on-going workflow for user's situation changes, and to reconstruct only the position under the influence of the changes in the DItree. Therefore, the suggested system can quickly and efficiently apply a change of user's new situation into a on-going workflow without a lot loss of the time and the space, and can offer a context-aware service continuously, according to a new workflow.