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Manpower Systems Operating under Heavy and Light Tailed Inter-Exit Time Distributions

Applied Mathematics 2014年第2期5卷 285-291页

作者： R. Sivasamy P. Tirupathi Rao k. thaga Department of Statistics Pondicherry University Puducherry India Statistics Department University of Botswana Gaborone Botswana

This paper considers a Manpower system where “exits” of employed personnel produce some wastage or loss. This system monitors these wastages over the sequence of exit epochs {t0 = 0 and tk.k.= 1, 2,…} that form a recurrent process and admit recruitment when the cumulative loss of man hours crosses a threshold level Y, which is also called the break.own level. It is assumed that the inter-exit times Tk.= tk.1 - tk. k.= 1, 2,… are independent and identically distributed random variables with a common cumulative distribution function (CDF) B(t) = P(Tk.t) which has a tail 1 – B(t) behaving lik. t-v with 1 v as t → ∞. The amounts {Xk. of wastages incurred during these inter-exit times {Tk. are independent and identically distributed random variables with CDF P(Xk.X) = G(x) and Y is distributed, independently of {Xk. and {tk., as an exponentiated exponential law with CDF H(y) = P(Y y) = (1 - e-λy)n. The mean waiting time to break.down of the system has been obtained assuming B(t) to be heavy tailed and as well as light tailed. For the exponential case of G(x), a comparative study has also been made between heavy tailed mean waiting time to break.down and light tailed mean waiting time to break.down values. The recruitment policy operating under the heavy tailed case is shown to be more economical in all types of manpower systems.

关键词： Manpower System Recruitment Policy Inter-Exit Time Wastage Waiting Time to Break.own Heavy Tailed Inter-Exit Time Distribution and Light Tailed Distribution

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