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Paper Abstract and Keywords
Presentation 2013-03-13 08:30
Topological Feature Extraction on Rambling Activities using Knot Theory
Masakatsu Ohta (NTT) AI2012-49
Abstract (in Japanese) (See Japanese page) 
(in English) Recent advances in positioning technologies, such as global positioning systems, have accelerated trajectory analyses for space planning. A method for investigating rambling activities (multi-stop and multi-purpose
trips) of moving objects is proposed. The goal is to construct common metrics used in various environments for characterizing the trajectory followed by rambling objects. Mathematical knot theory is introduced to examine the topological relation between intersections in each trajectory. The trajectories in an environment are represented in a vector space consisting of primitive knots. A primitive knot is universal for all environments and thus it is possible to compare the features of rambling activities across environments. An experiment using real-world taxi trajectories confirmed that our method effectively classifies rambling activities according to daytime, nighttime, and a special event.
Keyword (in Japanese) (See Japanese page) 
(in English) rambling activities / trajectory / knot theory / topology / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 477, AI2012-49, pp. 49-54, March 2013.
Paper # AI2012-49 
Date of Issue 2013-03-04 (AI) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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 AI2012-49

Conference Information
Committee AI JSAI-DOCMAS JSAI-KBS JSAI-SAI IPSJ-ICS  
Conference Date 2013-03-10 - 2013-03-13 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Social System and Information Technology 
Paper Information
Registration To AI 
Conference Code 2013-03-AI-DOCMAS-KBS-SAI-ICS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Topological Feature Extraction on Rambling Activities using Knot Theory 
Sub Title (in English)  
Keyword(1) rambling activities  
Keyword(2) trajectory  
Keyword(3) knot theory  
Keyword(4) topology  
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1st Author's Name Masakatsu Ohta  
1st Author's Affiliation NTT Corporation (NTT)
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Speaker Author-1 
Date Time 2013-03-13 08:30:00 
Presentation Time 25 minutes 
Registration for AI 
Paper # AI2012-49 
Volume (vol) vol.112 
Number (no) no.477 
Page pp.49-54 
#Pages 6 
Date of Issue 2013-03-04 (AI) 

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