中文摘要：

情境感知是普适计算环境的本质特征之一.本文提出了一种面向分布式情境感知的分层模型,通过情境资源的空间划分,刻画了传感器到情境知识的逐层抽象的特质.同时,分层模型对情境感知系统中的角色及角色间的关系进行了有效规约.本文通过与经典的Context Toolkit模型比较,证明了分层模型的运行时负载低的优点;通过模型的主动性分析,验证了情境感知主动性对系统数据收发负载的正反比影响.分层模型将在分布式情境感知系统部署和配置中发挥重要作用.

英文摘要：

Context awaress is one of the essential characteristics of the ubiquitous computing environment. Through the division of context space, this paper proposes a hierarchical distributed context awareness model which describes the layered abstraction from sensor data to context information. On the basis of the hierarchical model, this paper gives the detailed specification of the diversified roles of a context awareness system and the relationship between those roles. At the end of this paper, the simulation experiment is built to compare the proposed model with typical Context Toolkit model. The experiment shows that the proposed model has an advantage of lower nmtime payload over the Context Toolkit model. Through the analysis on the activeness of the model, it is proved that the aware activeness is proportional to receiving data payload and inversely proportional to sending data payload. The hierarchical model which will play an important role in the configuration of a distributed context awareness system.