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In this paper, the authors proposed an advanced Petri Net model to manage the workflow of a web-based multiple participants in virtual University. The presented approach not only can conspicuously help the developer to comprehend the interaction relationship but also to easily construct a shared and trusted virtual world. This approach was based on the scaffolding theory and ontology. Learning activities of students and teachers are supported and understood by each other by the intelligent knowledge system. Their behaviors including the student's self regulations and the teacher's/virtual campus regulations are performed and built with trust development.
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