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Paper Abstract and Keywords
Presentation 2015-05-22 10:00
On the Computational Complexity of Information Flow Problem with Hierarchy Constraint
Yuki Takeda, Yuichi Kaji, Minoru Ito (NAIST) IT2015-11 EMM2015-11
Abstract (in Japanese) (See Japanese page) 
(in English) An information flow problem discusses how to distribute information over a complicated network. It is known that the technique of the network coding plays an essential role in a certain type of information flow problems,
but not so much are known about other types of the problem. As an extension of Lehman's investigation, this study introduces a hierarchy constraint of messages, and discusses the computational complexity of the problem to determine if a given information flow problem has a linear solution or not. Nine classes of problems are newly defined, and classified to one of three categories that were discovered by Lehman.
Keyword (in Japanese) (See Japanese page) 
(in English) information flow problem / network coding / computational complexity / hierarchy constraint / mesh network / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 37, IT2015-11, pp. 57-62, May 2015.
Paper # IT2015-11 
Date of Issue 2015-05-14 (IT, EMM) 
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)
Download PDF IT2015-11 EMM2015-11

Conference Information
Committee EMM IT  
Conference Date 2015-05-21 - 2015-05-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto International Community House 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Information Security, Information Theory, Information Hiding, etc. 
Paper Information
Registration To IT 
Conference Code 2015-05-EMM-IT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On the Computational Complexity of Information Flow Problem with Hierarchy Constraint 
Sub Title (in English)  
Keyword(1) information flow problem  
Keyword(2) network coding  
Keyword(3) computational complexity  
Keyword(4) hierarchy constraint  
Keyword(5) mesh network  
1st Author's Name Yuki Takeda  
1st Author's Affiliation Nara Institute of Science and Technology (NAIST)
2nd Author's Name Yuichi Kaji  
2nd Author's Affiliation Nara Institute of Science and Technology (NAIST)
3rd Author's Name Minoru Ito  
3rd Author's Affiliation Nara Institute of Science and Technology (NAIST)
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Date Time 2015-05-22 10:00:00 
Presentation Time 25 
Registration for IT 
Paper # IEICE-IT2015-11,IEICE-EMM2015-11 
Volume (vol) IEICE-115 
Number (no) no.37(IT), no.38(EMM) 
Page pp.57-62 
#Pages IEICE-6 
Date of Issue IEICE-IT-2015-05-14,IEICE-EMM-2015-05-14 

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