Syntactic and Semantic Lexical Information Processing : Toward Automated Information Retrieval in a Japanese-English Dictionary

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In this research, the methods for morphological analysis, lexical information processing, and user-interfacing were investigated toward construction of a prototype computer system to support Japanese and/or English learners to use Japanese-English on-line dictionaries.(1) In order to process lexical information, systems which make use of the hierarchy of lexical types, lexical rules, and morpho-phonological information were compared. It was concluded that, not only for inflectional languages like English, but also for agglutinative languages like Japanese, both the hierarchy of lexical types (for inflections) and the lexical rules (for derivations) are necessary.(2) The attribute-value system which makes it possible to encode lexical information was employed to determine the numbers and the syntactic categories of complements as well as alternative subcategorization frames for polymorphic lexical items. It was based upon the view that polysemy is the trigger to alter subcategorization frames of predicates, and the alternation process was captured as the result of application of lexical rules such as type coercion and co-composition to predicates.(3) The process of noun-noun compound formation was classified into a few major types of semantic information processing such as coercion and co-composition, and each type of process was formalized in terms of separate lexical rules.(4) A graduate assistant implemented and tested the hierarchy of lexical types and lexical rules as an extension of the morphological analyzer which had been implemented prior to this research.