2010 Fiscal Year Final Research Report
Automatic prosody evaluation and grammatical mistake detection for English learning by Japanese native speakers
| Project/Area Number |
20320075
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Foreign language education
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| Research Institution | Tohoku University |
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Principal Investigator |
ITO Akinori Tohoku University, 大学院・工学研究科, 教授 (70232428)
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| Co-Investigator(Renkei-kenkyūsha) |
SUZUKI Motoyuki 徳島大学, 大学院・ソシオテクノサイエンス研究部, 准教授 (30282015)
MAKINO Shozo 東北文化学園大学, 科学技術学部, 教授 (00089806)
OHKAWA Yuichi 東北大学, 教育情報学研究部, 助教 (60361177)
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| Project Period (FY) |
2008 – 2010
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| Keywords | e-ラーニング・コンピュータ支援教育 / 英語発音教育 |
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| Research Abstract |
I have developed two methods that enable speaking exercise in a computer-assisted language learning (CALL) system : a method for evaluating prosody of an English utterance made by a learner, and a method for detecting grammatical mistakes included in the learner's utterance. As for prosody evaluation, I developed an estimation method of word importance factors using a decision tree, and obtained a high correlation to human assessment score, which is comparable to correlation between scores given by human evaluators. As for the grammatical mistake detection, I proposed a method for training an n-gram language model from artificially generated sentences with mistakes, and obtained 89.2% word accuracy.
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