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Paper Abstract and Keywords
Presentation 2009-05-21 16:00
A failure rate estimation considering the change in the number of equipment
Hiroyuki Funakoshi, Tatsuya Matsukawa (NTT) NS2009-17
Abstract (in Japanese) (See Japanese page) 
(in English) The authors have been insisted on the importance of reliability management for IP networks constructed of commercial equipments, and studied the management technique using the actual failure data.
Failure rate, unavailability, and maintainability are the typical measures for the reliability management of telecommunication networks.
The authors have established the unavailability estimation method considering the failure scale and social influence. Moreover, the authors have clarified that the service outage times have the mixed log-normal distribution and that the actions for repairs is related tothe number of mixtures. The average failure rate calculated from a month of failure data is often used. However, the accurate failure rate is not always obtained. It is because the number of users and equipments in telecommunication networks changes. In this paper, the authors propose the method for estimating the instantaneous failure rate by using the number of equipments and cumulative failures. And the strength of our proposal is shown over the analysis using actual field data.
Keyword (in Japanese) (See Japanese page) 
(in English) reliability / failure rate / number of equipments / cumulative failures / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 36, NS2009-17, pp. 1-6, May 2009.
Paper # NS2009-17 
Date of Issue 2009-05-14 (NS) 
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 NS2009-17

Conference Information
Committee NS  
Conference Date 2009-05-21 - 2009-05-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima City University (Hiroshima) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Advanced Protocol and Network Control (Application level routing, QoS and Path Control, P2P, P4P, SIP), Network System Architecture (Interface, Hardware, Software) 
Paper Information
Registration To NS 
Conference Code 2009-05-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A failure rate estimation considering the change in the number of equipment 
Sub Title (in English)  
Keyword(1) reliability  
Keyword(2) failure rate  
Keyword(3) number of equipments  
Keyword(4) cumulative failures  
1st Author's Name Hiroyuki Funakoshi  
1st Author's Affiliation Nippon Telegraph and Telephon Corporation (NTT)
2nd Author's Name Tatsuya Matsukawa  
2nd Author's Affiliation Nippon Telegraph and Telephon Corporation (NTT)
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Date Time 2009-05-21 16:00:00 
Presentation Time 25 
Registration for NS 
Paper # IEICE-NS2009-17 
Volume (vol) IEICE-109 
Number (no) no.36 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-NS-2009-05-14 

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