Clause Anaphora Resolution for Japanese Demonstrative Determiner Based on Semantic Similarity between Different Part-of-Speech

An anaphora is a type of expression whose reference depends upon another referential element. In order to become aware of situations or human intentions by natural language understanding, it is important to estimate correctly what anaphoric expressions indicate. In particular, an anaphora resolution for Japanese demonstrative determiners is critical to be aware of situation, context or a causal relationship in dialogue. Ontology-based similarity has been proposed as a way to identify referential elements, however, a method using ontology alone cannot resolve all anaphoric relations. This paper proposes an anaphora analysis method that uses semantic similarity between different part-of-speech and conceptual dependency structure. This method specializes in resolving clause anaphoric. The evaluation of this method showed 100% accuracy for resolving Japanese demonstrative determiner in counseling dialogue.