3 resultados para semantic formalization

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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Ontologies play a core role to provide shared knowledge models to semantic-driven applications targeted by Semantic Web. Ontology metrics become an important area because they can help ontology engineers to assess ontology and better control project management and development of ontology based systems, and therefore reduce the risk of project failures. In this paper, we propose a set of ontology cohesion metrics which focuses on measuring (possibly inconsistent) ontologies in the context of dynamic and changing Web. They are: Number of Ontology Partitions (NOP), Number of Minimally Inconsistent Subsets (NMIS) and Average Value of Axiom Inconsistencies (AVAI). These ontology metrics are used to measure ontological semantics rather than ontological structure. They are theoretically validated for ensuring their theoretical soundness, and further empirically validated by a standard test set of debugging ontologies. The related algorithms to compute these ontology metrics also are discussed. These metrics proposed in this paper can be used as a very useful complementarity of existing ontology cohesion metrics.

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新的计算模式,普适计算和全局计算,正在作为高度分布式和移动计算的计算模式展现出来。这篇论文探讨了在抽象层面上支持这些新型计算模式的适合的形式化基础,关注在进程移动单位上的控制, 以便在分布式与移动计算环境下更好地协调进程的移动性。 论文的第一部分概述了针对分布式、移动计算的现有进程演算模型中的进程移动单元,并且设计了一种在此方面更优、更具弹性的进程框架。为了表示这种进程框架,我们提出了一种新的、针对移动和分布式系统的进程演算,这种进程演算的优点是动态、弹性的控制进程的移动单元;具体的思路就是扩展π- calculus以及其支持分布式和移动性的变体。我们把这种新的演算叫做Modular π-calculus。我们通过这种演算的提出来说明进程框架提供了一种针对移动进程更为合适的协调机制以及编程模型,例如移动的代理和动态组件载入的支持。之后,我们通过讨论互模拟的几种提法来具体说明能够反映演算设计的进程描述的关键,之后我们讨论了它们的具体性质。 本文的第二部分提出了一个对进程模型的行为和性质进行推理的规约框架。首先,提出了一个对Modularπ-calculus中进程的系统性质进行规约的模态逻辑。为了更好的理解该逻辑,文中对由这个逻辑推出的进程等价的特征进行了研究,并且证明了该逻辑的区分能力介于互模拟和结构一致之间。接下来关于这个规约框架的自动化,本文针对该逻辑和Modular π-calculus的有限控制子集,提出了模型检测算法,并且给出了算法正确性的证明。同时文中贯穿了一些实际且直观的例子,以展现本文提出的一组框架即演算、逻辑和模型算法的有效性。