Distribution of Total Uptime during a Given Time Interval

Kenichi Funaki, Kazuho Yoshimoto

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


The distribution of total uptime during a given time interval for a repairable system is obtained. The total uptime is the total amount of time the system is up (in operation) during the interval. It is assumed that: 1) the system starts to operate at the beginning of the interval and alternately takes only the two states, up and down (under repair), 2) repair restores the system to “like-new”. A simple approximation to the distribution function of total uptime for a shorter interval is presented.

Original languageEnglish
Pages (from-to)489-492
Number of pages4
JournalIEEE Transactions on Reliability
Issue number3
Publication statusPublished - 1994 Sept


  • Downtime
  • Repairable system
  • Uptime

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Electrical and Electronic Engineering


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