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Paper Abstract and Keywords
Presentation 2012-12-19 16:20
Recognizing Variations of Japanese "Good Morning" Phrases in Twitter
Yoshinari Fujinuma (Univ. of Tokyo), Hikaru Yokono (NII), Pascual Martinez-Gomez, Akiko Aizawa (Univ. of Tokyo/NII) NLC2012-39
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, the rapid growth of Consumer Generated Media (CGM) such as Twitter introduced much expressive variations and informal representations into textual resources. Although word segmentation is the first step in most Japanese language applications, current word segmentation tools are not sufficiently adapted to such informal text yet. In this paper, we focus on a most frequent phrase expression in Japanese morning twitter, “おはようございます”, and construct a CRF-based extractor of the variations. Using 500 manually annotated samples, we obtain F1 score of over 0.91 for both the head span (“おはよう”) and the entire span (including the attachment part such as “ございます”). We also show that the extracted variations contain normalization pattern which are not defined in JUMAN 7.0.
Keyword (in Japanese) (See Japanese page) 
(in English) Informal text / Rule extraction / Twitter / CRF / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 367, NLC2012-39, pp. 35-40, Dec. 2012.
Paper # NLC2012-39 
Date of Issue 2012-12-12 (NLC) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee NLC  
Conference Date 2012-12-19 - 2012-12-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Ookayama Campasu, Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NLC 
Conference Code 2012-12-NLC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Recognizing Variations of Japanese "Good Morning" Phrases in Twitter 
Sub Title (in English)  
Keyword(1) Informal text  
Keyword(2) Rule extraction  
Keyword(3) Twitter  
Keyword(4) CRF  
1st Author's Name Yoshinari Fujinuma  
1st Author's Affiliation The University of Tokyo (Univ. of Tokyo)
2nd Author's Name Hikaru Yokono  
2nd Author's Affiliation National Institute of Informatics (NII)
3rd Author's Name Pascual Martinez-Gomez  
3rd Author's Affiliation The University of Tokyo/National Institute of Informatics (Univ. of Tokyo/NII)
4th Author's Name Akiko Aizawa  
4th Author's Affiliation The University of Tokyo/National Institute of Informatics (Univ. of Tokyo/NII)
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Speaker Author-1 
Date Time 2012-12-19 16:20:00 
Presentation Time 25 minutes 
Registration for NLC 
Paper # NLC2012-39 
Volume (vol) vol.112 
Number (no) no.367 
Page pp.35-40 
Date of Issue 2012-12-12 (NLC) 

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