Non-preemptive priority queue system is a type of where customers with higher priorities cannot interrupt low one while being served. High consumers will still be at the head queue. This article discusses non-preemptive multiple working vacations, vacation can interrupted. Customers are classified into two classes, namely class I (non-preemptive customers) and II, exponentially distributed serv...

For patients with borderline personality disorder, separations from significant figures in their lives, including therapists, are thought to be particularly painful. According to clinical wisdom, these patients manifest aggressive and self-destructive behavior around the time of separation. However, virtually no empirical studies have been conducted to test these beliefs. In this study, the beh...

This paper presents the analysis of a continuous review perishable inventory system wherein the life time of each item follows an exponential distribution. The operating policy is (s,S) policy where the ordered items are received after a random time which follows exponential distribution. Primary arrival follows Poisson distribution and they may turnout to be posit...

Consider an M/M/1 queueing system with server vacations where the server is turned oo as soon as the queue gets empty. We assume that the vacation durations form a sequence of i.i.d. random variables with exponential distribution. At the end of a vacation period, the server may either be turned on if the queue is non empty or take another vacation. The following costs are incurred: a holding co...

We consider a MAP/PH/1-type queueing system with server vacations as model that is useful for the analysis of multiple access systems polling discipline without transmission interruption. Vacation corresponds to service providing competitive information flows system. In this paper, we vacation under pretty general assumptions about probabilistic distributions describing behavior and realistic a...

In this paper, we consider retrial queueing systems with batch arrivals in which the server is subject to controllable interruptions (called vacations) and random interruptions (breakdowns). No specific assumption is taken regarding probability distributions of parametric random variables. The purpose of this work is to show effect of above mentioned parameters (in particular retrial and breakd...