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1 results

  • Tight bounds on the sensitivity of generalised semi-Markov processes with a single generally distributed lifetime

  • Part of
  • A. J. Coyle, P. G. Taylor
  • Journal:
    Journal of Applied Probability / Volume 32 / Issue 1 / March 1995
    Published online by Cambridge University Press:
    14 July 2016, pp. 63-73
    Print publication:
    March 1995

  • There are some generalised semi-Markov processes (GSMP) which are insensitive, that is the value of some performance measures for the system depend only on the mean value of lifetimes and not on their actual distribution. In most cases this is not true and a performance measure can take on a number of values depending on the lifetime distributions. In this paper we present a method for finding tight bounds on the sensitivity of performance measures for the class of GSMPs with a single generally distributed lifetime. Using this method we can find upper and lower bounds for the value of a function of the stationary distribution as the distribution of the general lifetime ranges over a set of distributions with fixed mean. The method is applied to find bounds on the average queue length of the Engset queue and the time congestion in the GI/M/n/n queueing system.