A Method for describing Japanese Grammar Rules based on Hierarchical Structure of Predicate

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  • 日本語の述部階層構造に基づく形態論的な文法規則の記述法

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Abstract

As the analysis performance of the Natural Language Processing (NLP) systems has improved, grammar rules and lexicons to be used with NLP systems become complicated and large than before. On the other hand, it must be expected that new application filed using a NLP system is enlarging. The underlying task is to develop and modify the NLP systems with reconstruction of the grammar rules and lexicons that has the desired performance. Since the work needs many staffs and much time for the development, reconstruction of grammar rules and lexicons is hard work and also expensive. Methods to develop more efficiently the desired system which can be applied to new application filed are required. In this paper, a new method of a systematic description of grammar rules is proposed for the purpose of creating grammar rules and modify them. The way of abstracting grammar rules from linguistic phenomena has been studied with special reference to the formation of morph-syntactic structure of Japanese. Based on the generalization of the way, the new method was made for further improvement for grammar writing. The paper also describes the grammar rules created by using the proposed method to illustrate the effectiveness of the method. Thegrammar rules was applied to analysis of a set of newspaper editorial sentences. First, the linguistic phenomenon that the analysis was not completed were specified and extracted. We considered that the phenomenon were a demand specification of meeting a new analysis performance. According to the specification, the grammar rules were extended using the same procedure of the method. Next, we checked that the analysis performance of the extended grammar rules was increasing. The result shows that it becomes possible to raise the analysis performance, maintain consistency of grammar rule description by following the method through the experiment. Generality raises for development work procedure of a grammar rule on engineering. Development time can also be shortened. The grammar rules described as an experiment runs on computer and are published from ICOT (Institute for New Generation Computer Technology). The proposed method in the paper is considered to be a trial which systematizes know-how of description of grammar rules as a knowledge base.

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