关键词: 普适计算, 上下文, 上下文感知, 本体

Abstract: Context modeling is the essential task to build context-aware systems， it’s the key for applications to understand and utilize context. Considering the lifecycle of context， it can be divided into persistent context and dynamic context； the latter can be further divided into state context and transition context. Many researchers have done lots of works about persistent context and state context modeling， but there are few works dealing with transition context. In this paper， a formal dynamic context model based on ontology using OWL is proposed， as well as a context fusion and consumption mechanism implementation. Also， some programming principles are provided for applications and a system called Auto-Lock Door is demonstrated to show how systems get benefit from the model.

Key words: pervasive computing, context, context-aware, ontology