We consider a general model for continuous-time Markov chains representing queueing systems in random environment. First we study the relationship between its equilibrium distribution and the Palm (or embedded) distributions at certain environmental change epochs. The results enable one to obtain the equilibrium distribution of the continuous-time model in terms of the equilibrium distribution ...

a non-destructive, rapid and low-cost determination of date fruit moisture content is one of the most determining factors in maturity assessment and processing of this valuable product. on the other hand, the potential of near infrared (nir) spectroscopy in nondestructive internal quality evaluation of agricultural products has been proved throughout several studies. in this research, three mod...

A one-of-a-kind assembly production system is considered. In this system, every product has its own tree structure process route. The new order for the customized product arrives randomly and follows some known probability distribution. The objective is to assign an early due date to every new ordered product and guarantee that no already-arrived product will be delayed. In order to achieve thi...

Stability studies play a critical role in assuring product quality at all points in the vaccine life cycle. These studies used to determine vaccine expiry date and vaccine efficacy. Accelerated stability and long term stability study performed for three batches of trivalent oral poliomyelitis vaccine (OPV) and three batches of monovalent OPV (type1) manufactured by Razi institute. After samplin...