Context-aware Hypermedia in a Dynamically Changing

Context-Aware Hypermedia in a Dynamically Changing Environment, Supported by a High-Level Petri Net. (December 2001) Jin-Cheon Na, B.S., Hanyang University; M.S., Oklahoma State University Chair of Advisory Committee: Dr. Richard Furuta In modern hypertext systems, with the increased availability of personal computers with environmental sensors (e.g., GPS sensors), adaptation support to meet the needs of the users in dynamically-changing environments will become essential. Hypertext systems supporting computing devices with environmental sensors will therefore benefit if they can also become context-aware. In this research, we introduce caT (for ContextAware Trellis), a context-aware hypertext model with associated tools, which supports flexible user (or agent) adaptation to changes in environmental information, such as time, location, bandwidth/cost, etc. The context-aware hypertext model incorporates high-level Petri nets, context-awareness, user-modeling, and fuzzy knowledge handling features into the previously-described Trellis hypertext model. Major features of the high-level Petri net that are explored are its hierarchical net, structured tokens, and flexible net description. Fuzzy knowledge (context) handling is supported by the integration of a fuzzy logic tool into the Petri net. In caT, the author who is accustomed to the caT model and its underlying formalism can specify various dynamic documents using the structured GUI (Graphical User Interface) authoring tool. Afterward, the