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The Research of Control Mechanisms and Its Implication of Context-aware Application in Distributed Environment

Author: XuSha
Tutor: ShiWeiRen
School: Chongqing University
Course: Control Theory and Control Engineering
Keywords: Context-aware ECA rules Reaction RuleML jDrew Web Services
CLC: TP391.1
Type: Master's thesis
Year: 2008
Downloads: 77
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Abstract


Context aware computing is characterized by perception, reasoning, and management of a variety of context information characterization entity status (physical status, social status), the establishment of the unified Context-oriented entities. The goal of context-aware computing Context based on the context of the reasoning and decision-making, the establishment of the entity is the center, the entity changes in a variety of contexts, intelligent application automatically make the appropriate response (action). The current context information of the application, the handling of the context information multi-use object-oriented model of event trigger. The context of the application is a typical application of knowledge, this knowledge includes not only the changing environmental context information, and also includes a variety of objective knowledge to improve the system's intelligence and increasing. Object mode, the structure of the system and can deal with the knowledge and more have been completed during the design phase, hardly changes as the environment changes. Therefore, the object-oriented model is difficult to adapt to the characteristics of the accumulating knowledge of the context of the application of the relevant context. The accumulation of knowledge, it is the key to continuously improve the context of the application system intelligence. To solve this problem, take an ECA (Event - Control - Action) rules-based mode to analyze the patterns of behavior of context-aware systems, in accordance with the rules established rule base. The system is context-aware knowledge systems, and build the rule base is similar to the rule base of the expert system. Starting from the essence of the knowledge system to create a context-aware system control mechanism, from accumulating the context-aware information to improve the system's intelligence. In this paper, based on the standard Reaction RuleML description language as the actual context reasoning rules, create a context-aware rule system. The implementation of the rule system is needed rules engine support rules engine is also a core of knowledge reasoning. With the rapid development of expert systems and knowledge systems, there are a variety of available rules engine, by comparison of the advantages and disadvantages of these engines applicability, the final selection of jDrew rules engine to enforce the rules. Practical applications in a distributed network environment, based on the the ECA context of the rule processing mode, distributed software architecture based on Web Services establish a distributed environment context aware system architecture, and solve the core problem: jDrew Web services packaging and delivery based on the context of the events of the WS-Eventing. The study analyzed how context-sensitive the event trigger jDrew rule-based reasoning to pass to the WS-Eventing. Web services environment jDrew processing efficiency is tested by experiment, and has good performance. The research for this article in context-aware applications (mobile-aware applications, smart space applications, etc.), there will be a certain application prospects.

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