基于本体的分层抽象模型

Ontology-based Hierarchical Abstraction Model

KRA表示模型给出了对物理世界W进行形式化建模的一般框架。在扩展后的广义KRA模型中引入本体概念,将抽象对象库扩展为本体类,在本体类中实现KRA模型框架中的感知层、语言层和理论层的知识共享和重用,简化了KRA模型的表示。分别定义了作用在物理世界W和本体类上的3种本体抽象算子(集):基本本体抽象算子、实体本体抽象算子集和连接本体抽象算子集,并给出了本体类之间的映射关系,通过这种映射关系能够实现模型抽象和模型还原。对本体类的抽象度进行形式化的定义,并给出了相关定理,指出在这样的框架中利用抽象映射可以自动构建物理世界W的抽象度不同的模型。

The KRA Model offers a generic framework to construct the model of the world W.In this paper,the ontologyof concept was introduced in the General KRA model and the Abstraction Object Database was extended to Ontology Class which makes the knowledge sharing and reuse possible in the Perception level,the Language level and the Theory level of the KRA model.The three kinds of ontology Abstraction operator（set） were also defined：fundamental operator,entity operator set and connection operator set,working on W and ontology class.Furthermore,the mapping between two different ontology classes was given to realize model Abstraction and model reverse-Abstraction.The Abstraction degree of ontology class was proposed to represent the degree of ontology class and it is as well pointed out that in such a framework,the models of W with different Abstraction degrees can be automatically constructed by using Abstraction mapping.