Katsunori Kotani


2018

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Assessment of an Index for Measuring Pronunciation Difficulty
Katsunori Kotani | Takehiko Yoshimi
Proceedings of the 5th Workshop on Natural Language Processing Techniques for Educational Applications

This study assesses an index for measur-ing the pronunciation difficulty of sen-tences (henceforth, pronounceability) based on the normalized edit distance from a reference sentence to a transcrip-tion of learners’ pronunciation. Pro-nounceability should be examined when language teachers use a computer-assisted language learning system for pronunciation learning to maintain the motivation of learners. However, unlike the evaluation of learners’ pronunciation performance, previous research did not focus on pronounceability not only for English but also for Asian languages. This study found that the normalized edit distance was reliable but not valid. The lack of validity appeared to be because of an English test used for determining the proficiency of learners.

2016

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Effectiveness of Linguistic and Learner Features to Listenability Measurement Using a Decision Tree Classifier
Katsunori Kotani | Takehiko Yoshimi
Proceedings of the 3rd Workshop on Natural Language Processing Techniques for Educational Applications (NLPTEA2016)

In learning Asian languages, learners encounter the problem of character types that are different from those in their first language, for instance, between Chinese characters and the Latin alphabet. This problem also affects listening because learners reconstruct letters from speech sounds. Hence, special attention should be paid to listening practice for learners of Asian languages. However, to our knowledge, few studies have evaluated the ease of listening comprehension (listenability) in Asian languages. Therefore, as a pilot study of listenability in Asian languages, we developed a measurement method for learners of English in order to examine the discriminability of linguistic and learner features. The results showed that the accuracy of our method outperformed a simple majority vote, which suggests that a combination of linguistic and learner features should be used to measure listenability in Asian languages as well as in English.

2015

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Application of a Corpus to Identify Gaps between English Learners and Native Speakers
Katsunori Kotani | Takehiko Yoshimi
Proceedings of the Eighth Workshop on Building and Using Comparable Corpora

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Design of a Learner Corpus for Listening and Speaking Performance
Katsunori Kotani | Takehiko Yoshimi
Proceedings of the 29th Pacific Asia Conference on Language, Information and Computation

2014

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A Listenability Measuring Method for an Adaptive Computer-assisted Language Learningand Teaching System
Katsunori Kotani | Shota Ueda | Takehiko Yoshimi | Hiroaki Nanjo
Proceedings of the 28th Pacific Asia Conference on Language, Information and Computing

2011

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Compiling Learner Corpus Data of Linguistic Output and Language Processing in Speaking, Listening, Writing, and Reading
Katsunori Kotani | Takehiko Yoshimi | Hiroaki Nanjo | Hitoshi Isahara
Proceedings of 5th International Joint Conference on Natural Language Processing

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Automatic Error Analysis Based on Grammatical Questions
Tomoki Nagase | Hajime Tsukada | Katsunori Kotani | Nobutoshi Hatanaka | Yoshiyuki Sakamoto
Proceedings of the 25th Pacific Asia Conference on Language, Information and Computation

2007

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Automatic Evaluation of Machine Translation Based on Rate of Accomplishment of Sub-Goals
Kiyotaka Uchimoto | Katsunori Kotani | Yujie Zhang | Hitoshi Isahara
Human Language Technologies 2007: The Conference of the North American Chapter of the Association for Computational Linguistics; Proceedings of the Main Conference

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Japanese Expressions that Include English Expressions
Masaki Murata | Toshiyuki Kanamaru | Koichiro Nakamoto | Katsunori Kotani | Hitoshi Isahara
Proceedings of the 21st Pacific Asia Conference on Language, Information and Computation

2005

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Toward a Unified Evaluation Method for Multiple Reading Support Systems: A Reading Speed-based Procedure
Katsunori Kotani | Takehiko Yoshimi | Takeshi Kutsumi | Ichiko Sata | Hitoshi Isahara
Companion Volume to the Proceedings of Conference including Posters/Demos and tutorial abstracts

2004

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Integrated Use of Internal and External Evidence in the Alignment of Multi-Word Named Entities
Takeshi Kutsumi | Takehiko Yoshimi | Katsunori Kotani | Ichiko Sata | Hitoshi Isahara
Proceedings of the 18th Pacific Asia Conference on Language, Information and Computation