期刊名称：International Journal of Advanced Computer Science and Applications(IJACSA)
印刷版ISSN：2158-107X
电子版ISSN：2156-5570
出版年度：2019
卷号：10
期号：9
页码：176-186
出版社：Science and Information Society (SAI)
摘要：In human to human communication, context
increases the ability to convey ideas. However, in human to
application and application to application communication, this
property is difficult to attain. Context-awareness becomes an
emergent need to achieve the goal of delivering more user-centric
personalized services, especially in ubiquitous environments.
However, there is no agreed-upon generic framework that can be
reused by deployed applications to support context-awareness. In
this paper, a defeasible logic-based framework for contextawareness
is proposed that can enhance the functionality of any
deployed application. The nonmonotonic nature of defeasible
logic has the capability of attaining justifiable decisions in
dynamic environments. Classical defeasible logic is extended by
meta-rules to increase its expressiveness power, facilitate its
representation of complex multi-context systems, and permit
distributed reasoning. The framework is able to produce justified
decisions depending on both the basic functionality of the system
that is itself promoted by contextual knowledge and any crosscutting
concerns that might be added by different authorities or
due to further improvements to the system. Active concerns that
are triggered at certain contexts are encapsulated in separate
defeasible theories. A proof theory is defined along with a study
of its formal properties. The framework is applied to a
motivating scenario to approve its feasibility and the conclusions
are analyzed using argumentation as an approach of reasoning.
