On ageing concepts for repairable items from heterogeneous populations

Ji Hwan Cha, Maxim Finkelstein

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Ageing concepts are very important in lifetime modeling and analysis. Monotonic failure rates are the simplest and most popular manifestations of aging properties of items in applications (IFR and DFR, accordingly). However, they are usually discussed for homogeneous populations, whereas heterogeneity can change dramatically the shape of the corresponding failure rate. In this paper, we suggest a new measure of ageing for items from heterogeneous populations based on the described process of information-based minimal repairs. We also show and illustrate, by several examples, that the conventional measure of aging based on the shape of the (population) failure rate is unrealistic in this case and can lead to wrong decisions, e.g., in burn-in procedures and optimal maintenance.

Original languageEnglish
Article number7494978
Pages (from-to)1864-1870
Number of pages7
JournalIEEE Transactions on Reliability
Issue number4
StatePublished - Dec 2016

Bibliographical note

Publisher Copyright:
© 1963-2012 IEEE.


  • Ageing
  • information-based minimal repair
  • population failure rate
  • statistical minimal repair


Dive into the research topics of 'On ageing concepts for repairable items from heterogeneous populations'. Together they form a unique fingerprint.

Cite this