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Paper Abstract and Keywords
Presentation 2008-11-10 13:30
Spoken Dialog Strategy Based On Understanging Graph Search
Yuji Kinoshita, Chiyomi Miyajima, Norihide Kitaoka, Kazuya Takeda (Nagoya Univ.) NLC2008-19
Abstract (in Japanese) (See Japanese page) 
(in English) We regarded information retrieval as a graph search problem and proposed several novel dialog strategies
that can recover from misrecognition through a spoken dialog that traverses the graph. To recover from misrecognition
without seeking confirmation, our system kept multiple understanding hypotheses at each turn and searched
for a globally optimal hypothesis in the graph whose nodes express understanding states across user utterances in a
whole dialog. For this search, we adopted three types of best-first search using heuristics. As for a dialog strategy,
we introduced a new criterion based on efficiency in information retrieval and consistency with understanding hypotheses
to select an appropriate system response. Using such criterion, the system removes the ambiguity so that
users do not feel that a response that conflicts with the actual user intent is unnatural. We developed a spoken
dialog system using these techniques and showed dialog examples in which misrecognition was naturally corrected.
From a simulation dialog experiment, we showed that our strategy was efficient in terms of the number of turns.
Keyword (in Japanese) (See Japanese page) 
(in English) spoken dialog system / information retrieval / graph search problem / system response generation / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 283, NLC2008-19, pp. 1-6, Nov. 2008.
Paper # NLC2008-19 
Date of Issue 2008-11-03 (NLC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 2008-11-10 - 2008-11-10 
Place (in Japanese) (See Japanese page) 
Place (in English) NICT (Tokyo) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NLC 
Conference Code 2008-11-NLC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Spoken Dialog Strategy Based On Understanging Graph Search 
Sub Title (in English)  
Keyword(1) spoken dialog system  
Keyword(2) information retrieval  
Keyword(3) graph search problem  
Keyword(4) system response generation  
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1st Author's Name Yuji Kinoshita  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
2nd Author's Name Chiyomi Miyajima  
2nd Author's Affiliation Nagoya University (Nagoya Univ.)
3rd Author's Name Norihide Kitaoka  
3rd Author's Affiliation Nagoya University (Nagoya Univ.)
4th Author's Name Kazuya Takeda  
4th Author's Affiliation Nagoya University (Nagoya Univ.)
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Speaker Author-1 
Date Time 2008-11-10 13:30:00 
Presentation Time 40 minutes 
Registration for NLC 
Paper # NLC2008-19 
Volume (vol) vol.108 
Number (no) no.283 
Page pp.1-6 
#Pages
Date of Issue 2008-11-03 (NLC) 


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