This paper considers various Markov-modulated processes which have been used in the literature to model internet traffic. In particular, such processes have been used to replicate the long-range dependent nature of internet traffic and the justification for doing so is that long-range dependence (LRD) has important effects on delays and buffer occupancy in traffic models. However, in combinatio...

the paper discusses the current state of research concerning railway network timetabling and traffic management. timetable effectiveness is governed by frequency, regularity, accurate running, recovery and layover times, as well as minimal headway, buffer times and waiting times. analytic (queuing) models and stochastic microsimulation are predominantly used for estimation of waiting times and ...

A number of models are being developed for the traffic, service and queuing in the emerging telecommunication networks. The task is rather difficult because the traffic is bursty and correlated. These models include the compound Poisson process (CPP), the Markov modulated Poisson process (MMPP) and self-similar traffic models such as the Fractional Brownian Motion (FBM). The CPP and the ∑K k=1 ...

In CT examination, the emergency patients (EPs) have highest priorities in the queuing system and thus the general patients (GPs) have to wait for a long time. This leads to a low degree of satisfaction of the whole patients. The aim of this study is to improve the patients' satisfaction by designing new queuing strategies for CT examination. We divide the EPs into urgent type and emergency typ...

there are some problems with estimating the time required for the manufacturing process of products, especially when there is a variable serving time, like control stage. these problems will cause overestimation of process time. layout constraints, reworking constraints and inflexible product schedule in multi product lines need a precise planning to reduce volume in particular situation of lin...

The growing complexity of modern systems has escalated the need for performance metrics. Stochastic models such as queuing networks and stochastic Petri nets have been used to model these systems so that their performance measures can be evaluated analytically. Product-form solutions are equilibrium state probabilities in networks of stochastic nodes (e.g. queues) in the form of a product of te...

In this paper we consider a queuing system in which the service times of customers are independent and identically distributed random variables, the arrival process is stationary and has the property of orderliness, and the queue discipline is arbitrary. For this queuing system we obtain the steady state second moment of the queue size in terms of the stationary waiting time distribution of a s...

OF THESIS A STUDY OF QUEING THOERY IN LOW TO HIGH REWORK ENVIRONMENTS WITH PROCESS AVAILABILITY In manufacturing systems subject to machine and operator resource constraints the effects of rework can be profound. High levels of rework burden the resources unnecessarily and as the utilization of these resources increases the expected queuing time of work in process increases exponentially. Queui...

abstraCt This article deals with the simplest abandonment model in which the customer's patience is exponentially distributed and the capacity of the system is unlimited. Sze (1984, 229-249) has designed a queuing model for the telephone operating system without abandonment. The most common model which supports the workforce management of the telephone centre is M/M/N/B and some special cases c...

This paper discusses a new approach for analyzing queuing models of material control strategies such as kanban, CONWIP and POLCA in manufacturing systems. In practice, these strategies regulate the flow of jobs at various stations of the manufacturing system using a combination of card loops and authorization signals. Queuing models of such systems are composed of closed queuing networks corres...