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Paper Abstract and Keywords
Presentation 2011-05-26 10:30
A study on the maintainability for telecommunication networks -- Reduction of processing time for non-parametric estimation --
Hiroyuki Funakoshi, Tatsuya Matsukawa, Yasuto Nakanishi (NTT) IN2011-19
Abstract (in Japanese) (See Japanese page) 
(in English) The authors have been established the reliability evaluation methods using actual outage data of telecommunication networks systematically. In particular, "R", a free software environment for statistical computing
and graphics, is important to analyze outage data efficiently. As for the maintainability, that evaluates the facility in maintenance, the authors proposed the capability of computation based on parametric estimation of
statistical models for the time to repair distribution. In the case of non-parametric estimation, the authors proposed the evaluation method of maintainability with kernel density. With this proposal, the result approximately conform to the parametric evaluation within 0 – about 90% range of observations. In this paper, the authors discuss the reduction of processing time for non-parametric estimation by refining R-code with self-made shared library. Accordingly, processing time is shortened by 15~20%. Moreover, the volume of data is increased because of the use of memory reduction.
Keyword (in Japanese) (See Japanese page) 
(in English) reliability / maintainability / non-parametric / kernel density / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 67, IN2011-19, pp. 7-12, May 2011.
Paper # IN2011-19 
Date of Issue 2011-05-19 (IN) 
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IN2011-19

Conference Information
Committee RCS IN  
Conference Date 2011-05-26 - 2011-05-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Internet, Multi-hop network, Mesh network, Network coding, Cross layer technique, Wireless communication, etc. 
Paper Information
Registration To IN 
Conference Code 2011-05-RCS-IN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study on the maintainability for telecommunication networks 
Sub Title (in English) Reduction of processing time for non-parametric estimation 
Keyword(1) reliability  
Keyword(2) maintainability  
Keyword(3) non-parametric  
Keyword(4) kernel density  
1st Author's Name Hiroyuki Funakoshi  
1st Author's Affiliation Nippon Telegraph and Telephone Corp. (NTT)
2nd Author's Name Tatsuya Matsukawa  
2nd Author's Affiliation Nippon Telegraph and Telephone Corp. (NTT)
3rd Author's Name Yasuto Nakanishi  
3rd Author's Affiliation Nippon Telegraph and Telephone Corp. (NTT)
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Date Time 2011-05-26 10:30:00 
Presentation Time 25 
Registration for IN 
Paper # IEICE-IN2011-19 
Volume (vol) IEICE-111 
Number (no) no.67 
Page pp.7-12 
#Pages IEICE-6 
Date of Issue IEICE-IN-2011-05-19 

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