Faculty Profiles - TOYAMA Katsuhiko

Papers - TOYAMA Katsuhiko

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Selection of Effective Contextual Information for Automatic Synonym Acquisition Reviewed

Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. 21st International Conference on Computational Linguistics and 44th Annual Meeting of the Association for Computational Linguistics page： 353-360 2006.7

Language：English

Various methods have been proposed for automatic synonym acquisition, as synonyms are one of the most fundamental lexical knowledge. Whereas many methods are based on contextual clues of words, little attention has been paid to what kind of categories of contextual information are useful for the purpose. This study has experimentally investigated the impact of contextual information selection, by extracting three kinds of word relationships from corpora: dependency, sentence co-occurrence, and proximity. The evaluation result shows that while dependency and proximity perform relatively well by themselves, combination of two or more kinds of contextual information gives more stable performance. We've further investigated useful selection of dependency relations and modification categories, and it is found that modification has the greatest contribution, even greater than the widely adopted subjectobject combination.

Application of of Word Alignment for Supporting Translation of Japanese Statutes into English Reviewed

Katsuhiko Toyama, Yasuhiro Ogawa, Kazuihiro Imai, Yoshiharu Matsuura

Legal Knowledge and Information Systems, JURIX 2006: The 19th Annual Conference page： 141-150 2006.12

Authorship：Lead author Language：English

Recently, society has expressed increased demands for translation of Japanese statutes into foreign languages. The various motivations behind these demands include social and economic globalization and the need for technical assistance to legal reform. In this paper, we describe the problem of translating Japanese statues and show how to solve it by utilizing technologies developed for natural language processing. In particular, we show how to support both the compilation of a standard bilingual dictionary and the unification of translation equivalents of legal technical terms in compliance with the dictionary by using word alignment.

Automatic Consolidation of Japanese Statutes based on Formalization of Amendment Sentences Reviewed

Yasuhiro Ogawa, Shintaro Inagaki, Katsuhiko Toyama

Proc. 1st Int. Workshop on Juris-informatics page： 18-29 2007.6

Language：English

To realize computer-supported works in the areas of legislation and the practical use of laws, a statute database is indispensable so that users can easily retrieve desired versions of desired statutes. However, almost all former versions of statutes need to be restored since they cannot
be easily obtained or digitalized. This task can be achieved by repeatedly consolidating
amendment statutes with each version of the statute from the first one. In this paper, for Japanese statutes, we show that amendment clauses, which are parts of amendment sentences, can be formalized in terms of sixteen regular expressions.
We also propose an automatic consolidation system for Japanese statutes based on the formalization and experts' knowledge about consolidation. System evaluation is shown through a consolidation experiment.

Effectiveness of Indirect Dependency for Automatic Synonym Acquisition Reviewed

Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. Workshop on Contextual Information in Semantic Space Models: Beyond Words and Documents page： 1-8 2007.8

コンピュータを利用した法令対訳辞書の比較

小川泰弘, 外山勝彦

日韓共同シンポジウム「日韓における国際的な法制協力の現状と課題」講演論文集 page： 27-41 2007.10

Effective Proximity Distance for Word-Based Context Reviewed

Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. 7th Int. Symp. on Natural Language Processing page： 105-110 2007.12

Context Feature Selection for Distributional Similarity Reviewed

Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. 3rd Int. Joint Conf. on Natural Language Processing page： 553-560 2008.1

Evaluation Metrics for Consistent Translation of Japanese Legal Sentences Reviewed

Yasuhiro Ogawa, Kazuhiro Imai, Katsuhiko Toyama

Proc. LREC 2008 Workshop on Semantic Processing of Legal Texts page： 42-50 2008.5

Bootstrapping-based Extraction of Dictionary Terms from Unsegmented Legal Text Reviewed

Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. 2nd Int. Workshop on Juris-informatics page： 63-72 2008.6

Metric Learning for Synonym Acquistion Reviewed

Nobuyuki Shimizu, Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama, Hiroshi Nakagawa

Proc. 22st Int. Conf. on Computational Linguistics page： 793-800 2008.8

Transliteration from Uighur to Uzbek for Expansion of Japanese Translation Dictionary Reviewed

Yasuhiro Ogawa, Muhtar Fukuda, Katsuhiko Toyama

Proc. Int. Conf. on Asian Language Processing 2008 page： 182-188 2008.11

KWISC -Dependency Visualization for Understanding Context- Reviewed

Yusuke Arai, Masato Hagiwara, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. 8th Int. Symp. on Natural Language Processing page： 163-168 2009.10

Design and Compilation of Syntactically Tagged Corpus of Japanese Statutory Sentences Reviewed

Yasuhiro Ogawa, Masayuki Yamada, Ryuta Kato, Katsuhiko Toyama

Proc. 4th Int. Workshop on Juris-informatics page： 85-96 2010.11

Design and Development of Japanese Law Translation Database System Reviewed

Katsuhiko Toyama, Daichi Saito, Yasuhiro Sekine, Yasuhiro Ogawa, Tokuyasu Kakuta, Tariho Kimiura, Yoshiharu Matsuura

Proc. Law via the Internet 2011 page： 12 pages 2011.6

Recall-Oriented Evaluation Metrics for Consistent Translation of Japanese Legal Sentences Reviewed

Yasuhiro Ogawa, Masaki Mori, Katsuhiko Toyama

Proc. 5th Int. Workshop on Juris-informatics page： 62-73 2011.12

Bootstrapping-based Extraction of Bilingual Dictionary Terms from Parallel Corpus Reviewed

Jin Renzhe, Yasuhiro Ogawa, Agro Rachmatullah, Katsuhiko Toyama

Proc. Joint Int. Symp. on Natural Language Processing and Agricultural Ontology Service 2011 page： 95-99 2012.2

A Pattern-Based Approach to Hyponymy Relation Acquisition for the Agricultural Thesaurus Reviewed

Makoto Nakamura, Ryusei Kobayashi, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. Int. Symp. on Agricultural Ontology Service 2012 page： 2-9 2012.2

The Development of Translation Memory Database System for Law Translation Reviewed

Yasuhiro Sekine, Katsuhiko Toyama, Yasuhiro Ogawa, Yoshiharu Matsuura

Proc. Law via the Internet 2012 page： 21 pages 2012.10

Extraction of defined legal terms and their explanations from a Japanese legal corpus -- Towards construction of a legal term ontology Reviewed

Makoto Nakamura, Yasuhiro Ogawa, Katsuhiko Toyama

Proc. Law via the Internet 2013 page： 10 pages 2013.9

Translation for Outlines of Japanese Acts Reviewed

Yasuhiro Ogawa, Dai Inagi, Makoto Nakamura, Katsuhiko Toyama

Proc. Law via the Internet 2013 page： 12 pages 2013.9

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Papers - TOYAMA Katsuhiko