Abstract
Ontology has been used in many hot-spot fields, but most ontology construction methods are semiautomatic, and the construction process of ontology is still a tedious and painstaking task. In this paper, a kind of cognitive models is presented for ontology learning which can simulate human being’s learning from world. In this model, the cognitive strategies are applied with the constrained axioms. Ontology update is a key step when the new knowledge adds into the existing ontology and conflict with old knowledge in the process of ontology learning. This proposal designs and validates the method of ontology update based on the axiomatic cognitive model, which include the ontology update postulates, axioms and operations of the learning model. It is proved that these operators subject to the established axiom system.
Highlights
Ontology as an effective semantic modelling method has been widely used in the Semantic Web[1,2], Knowledge Base[3], E-commerce[4], Information Retrieval[5] and Digital Library[6], and in many reasoning-based fields such as bio information and medicine information analysis[7,8] fields.A kind of cognitive models is presented for ontology learning which can simulate human being’s learning from world
An ontology update strategy is proposed to maintain the coordination of the ontology when it changed with time
In the cognitive modelof ontology learning, when learner agent acquiring a new assertion from the outside world Wand the assertion is conflict with the original knowledge of the learner agent, it need to change the existing knowledge if it is due to the outside world changing
Summary
Ontology as an effective semantic modelling method has been widely used in the Semantic Web[1,2], Knowledge Base[3], E-commerce[4], Information Retrieval[5] and Digital Library[6], and in many reasoning-based fields such as bio information and medicine information analysis[7,8] fields. A kind of cognitive models is presented for ontology learning which can simulate human being’s learning from world. In the cognitive modelof ontology learning, when learner agent acquiring a new assertion from the outside world Wand the assertion is conflict with the original knowledge of the learner agent, it need to change the existing knowledge if it is due to the outside world changing. In this case, the agent should update the corresponding knowledge in the ontology by updating strategy. When the learner agent has obtained a new statement about the outside world, it would add into its knowledge base that represented by assertion, the learner agent checks the ontology consistency and whether the assertion has time constrains, if the new assertion meets both of the update conditions, we take update operations
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