The objective of this paper is to determine the cause of queues in hair dressing salons, the average time a customer spends in the salon as a result of the queue, the applicability of a mathematical model (Queuing Models) for use in the management of waiting line problems in hair-dressing salons...

We present a Markov model to approximate the queueing behavior at the G(t)/G(t)/s(t)+G(t) queue with exhaustive discipline and abandonments. The performance measures of interest are: (1) the average number of customers in queue, (2) the variance of the number of customers in queue, (3) the...

Comprehensive long term maintenance contracts are a recent trend in equipment industries. At the same time increasing environmental concerns and high prices for raw materials stress the importance of remanufacturing activities. Hence, maintenance contracts often result in remanufacturing of some...

Consider the following due-date scheduling problem in a multiclass, acyclic, single-station service system: any class k job arriving at time t must be served by its due date t D_{k}. Equivalently, its delay ¦Ó_{k} must not exceed a given delay or lead-time D_{k}. In a stochastic system the...

We study how multi-product queueing systems should be controlled so that sojourn times (or end-to-end delays) do not exceed specified leadtimes. The network dynamically decides when to admit new arrivals and how to sequence the jobs in the system. To analyze this difficult problem, we propose an...

Long queues in seasonal sales shopping are seemingly undesirable for shoppers and retailers. Yet, this paper proposes that shoppers' impatience can be a virtue for retailers. It shows that, when shoppers do queue, it is desirable under some conditions for retailers to strategically keep the...

In this Extended Appendix, we extend the mixed integer second-order cone programming (MISOCP) formulation as well as the heuristics derived in Mak et al. (2013) to tackle the problem of assigning and sequencing appointments for multiple servers. Numerical examples are provided to demonstrate the...

We consider a dynamic control problem for a parallel server system commonly known as the N-system. An N-system is a two-server parallel server system with two job classes, one server that can serve both classes, and one server that can only serve one class. We assume that jobs within each class...

We study a closed, three-station queuing network with general service time distributions and balanced workloads (that is, each station has the same relative traffic intensity). If the customer population is large, then the queue length process of such a network can be approximated by driftless...

Fundamental business principles are very critical to the growth and survival of the business. Waiting in line or queue causes inconvenience to customers and economic costs to firms. Queuing theory is a mathematical approach to the study of waiting in lines/queues. The study presents the results...