An Analysis Method of Open Queueing Networks with a Degradable Structure and Instantaneous Repair Times of Systems

An unreliable open queueing network with Poisson arrivals is considered.For each queueing system the service and failures times are exponentially distributed random variables.The failures of systems lead to changes in the structure of the network and corresponding changes in the performance measures of the queueing network.It is assumed that the ti

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OVARIAN AGING AND INFERTILITY TREATMENT

Background.Due to changes in the socio-economic environment the first pregnancy is being more often postponed to advanced age; an increasing number of women seek medical help for infertility in their late thirties.Degenerative processes in the ovary start as early as after 35 years of age.When the woman is over 38, the signs of hormonal changes occ

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