An implementation of Japanese Grammar based on HPSG

1 Abstract In this thesis, I shall show h o w Japanese Phrase Structure Grammar Gun877 can be implemented in LexGram KB955, an amalgam of Categorial grammar Lam61 and Head Driven Phrase Structure Grammar PS944. The thesis presents a parser which covers three characteristic phenomena in Japanese: 1word order variation, 2 gaps in a sentence, and 3relativization. To cover word order variation, the argument list for a verb, which speciies its subcategorization requirements, is deened as a set of arguments rather than as a list. The gaps in a sentence are dealt with by giving verbs categories additional to the basic ones. As for relativization, verb adnominal forms are deened in a similar way to adjectives without using traces. The parser was tested against data collected from Japanese Map Task Corpus AIK + 944. We have shown that the parser can parse sentences in reasonable speed, an average of 271.77 msec. per sentence with an average of 6 words per sentence. i 2 Acknowledgements I wish to thank Dr. Chris Mellish for his helpful comments and guidance on my project, and Dr. Esther KK onig for her advice and support on the grammar and thesis. I also thank Dr. Carl Vogel who gave me lectures on CUF and HPSG, and Kei Yoshimoto for his comments on JPSG. The Map Task corpora were valuable sources to test the parser on, and I thank people who have worked on them. As for the Japanese version, I am specially grateful to Syun Tutiya and Hanae Koiso, who provided me with the corpus and related documents. ii Contents