Earticle

In order to provide a highly formalized ontology merging of hierarchical information modeling for distributed management, the Extenics-based approach is introduced to formalize ontology merging of both Management Information Base (MIB) models and MIB instances. The aim of this paper is then to utilize ontology merging at the meta-schema level based on concept lattices to generate semantic models for ontology merging of MIB models using basic-elements in the form of matter-elements, and realize the formal presentation of both MIB instances for ontology merging and implicit knowledge for MIB instances with the use of the extension theory for basic-elements. The proposed Extenics-based ontology merging approach for both MIB models and MIB instances integrates with the former approach for meta-schema based on concept lattices, and aims to promote the formalization level of hierarchical information modeling for distributed management in a unified ontology-driven manner.

In view of the limit of mechanical products adaptive design in aspects of case representation, retrieval and modification, the representation and reuse technique of knowledge are studied. There are different importance of matter-element in different design stage, so a kind of similarity calculation method which based on the extension of weighted matter-element is put forward. The product design not only have functional requirements but also structural requirements, so the solving method about incompatible problems and opposite problems in extenics is introduced, a model of products extension adaptive design which based on case reuse is established.

With increasing requirements of network users for intelligent security management, unified network security management has become a fashion, and a remarkable development trend is the adoption of an alert-centric event correlation manner. This paper then introduces Extenics into the study on alert-centric event correlation for unified network security management and proposes a formalized approach using basic-elements based on the extension theory. The proposed approach utilizes the basic-elements to formalize the representations of alerts, events, and also correlation policies for network security in a unified manner, and then makes full use of the extension theory to formalize basic operators for extension expressions and extension functions in order to realize alert-centric event correlation. Validation scenarios of timing constraints show that, the proposed approach provides a prospective way to alert-centric event correlation for unified network security management by introducing basic-elements and utilizing extension expressions and extension functions with the use of containing analysis, sequencing analysis and extension transformations based on the extension theory.

Extenics and rough set theory are brought into transformer fault diagnosing procedure in this paper to get rid of abundant information data and to obtain more precise diagnosing result. Using the dissolved gas data as fault diagnosing attribution set, attributions which are needed for transformer fault diagnosis are predigested and preliminarily grouped by means of rough set method, and then matter element model for transformer’s fault diagnosing is built. With the transformer’s standard fault modes as the transformer’s fault diagnosing decision set, utilizing extenics association function to calculate each fault degree, acceptance and rejection rule is defined to diagnose transformer’s fault. 76 dissolved gas information data have been collected to verify the method proposed in this paper, the diagnosing results show that the correctness of diagnosing results got by this method is better than frequently used IEC three ratio methods.

In order to comprehensively manage risks of smart grid and to make risk assessment more scientific, in this paper a smart grid risk assessment system is established in terms of 5 aspects, i.e., technology risk, management risk, implementation (environment) risk, economy risk and safety risk. Then a matter-element-based risk assessment model is put forward. Finally, with help of this model, the correlation degree of current smart grid risk rank in China is worked out and corresponding risks have been analyzed and assessed