Similarity and Correlation
The semantic similarity of ontology concept contains three key words: 'ontology',
'semantic' and 'similarity'. 'ontology concept' indicates the object of similarity
measurement; 'Semantic' provides a basis of similarity measurement; 'Similarity' means a
psychological reaction [10] generated with the concept. Liu et al. defined the similarity of
concept by the dependences between concepts. The correlation of two concepts reflects
the degree of correlation between them, which can be measured by the possibility of cooccurrence
of two concepts in the same context [11]. Lin proposed a generalized
definition of similarity based on information science and four intuitions of similarity
required for the definition of similarity [12].