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Báo cáo khoa học: "CLASSIFICATION OF MODALITY FUNCTION AND ITS APPLICATION ANALYSIS TO JAPANESE LANGUAGE"

This paper proposes an analysis method for Japanese modality. In this purpose, meaning of Japanese modality is classified into four semantic categories and the role of it is formalized into five modality functions. Based on these formalizations, information and constraints to be applied to the modality analysis procedure are specified. Then by combining these investigations with case analysis, the analysis method is proposed. This analysis method has been applied to Japanese analysis for machine translation. . | CLASSIFICATION OF MODALITY FUNCTION AND ITS APPLICATION TO JAPANESE LANGUAGE ANALYSIS Shozo NATTO Akira SHIMAZU and Hirosato NOMURA Musashino Electrical Communication Laboratories N.T.T. 3-9-11 Midori-cho Musashino-shi Tokyo 180 Japan Abstract This paper proposes an analysis method for Japanese modality. In this purpose meaning of Japanese modality is classified into four semantic categories and the role of it is formalized into five modality functions. Based on these formalizations information and constraints to be applied to the modality analysis procedure are specified. Then by combining these investigations with case analysis the analysis method is proposed. This analysis method has been applied to Japanese analysis for machine translation. 1. Introduction Since the meaning of a sentence consists of both proposition and modality 121 analysis of modality is as indispensable as that of proposition for natural language understanding and machine translation. However studies on natural language analysis have mainly concerned with the propositional part and algorithms for analyzing modality have not yet been sufficiently developed. The aim of this paper is to clarify the function of modality and to propose a method for analyzing the modality in Japanese sentences. Structure of a Japanese complex sentence can be formalized roughly by iterative concatenation of simple sentences. The simple sentence consists of cases and a predicate. The cases have surface representations of noun phrases or adverb phrases while the predicate has that of verb or adjective or adjective verb. A noun phrase is defined as the recursive concatenation of noun phrase or that of embedded sentence. We have employed the case structure as a basic meaning structure for a simple sentence and extended it to retain the construction of complex sentences mentioned. Modality is additive information represented by auxiliary words such as modal particles ending particles and auxiliary verbs and sentence .