Testing is one way of validating that the customers have specified the right product and verifying that the developers have built the product right. Traditional testing methodologies such as: path, branch, instruction, mutation, scenario, or requirement testing usually treat all aspects of software as equally important [1], and is often reduced to a purely technical issue leaving the close rela...

In this paper we consider a single-server cyclic polling system. Between visits to successive queues, the server is delayed by a random switch-over time. The order in which customers are served in each queue is determined by a priority level that is assigned to each customer at his arrival. For this situation the following service disciplines are considered: gated, exhaustive, and globally gate...

This is the situation of interest in a trunked mobile system with priority, as the application of priorities is under heavy traffic: if the system is correctly sized, under regular load conditions no priorities are needed, as the waiting time must be low for all customers. For all delay probabilities the relative error of the mean waiting time for priority calls is no longer guaranteed to be lo...

We investigate the use of priority mechanisms when assigning service engineers to customers as a tool for service differentiation. To this end, we analyze a non-preemptive M/G/c priority queue with various customer classes. For this queue, we present various accurate and fast methods to estimate the first two moments of the waiting time per class given that all servers are occupied. These waiti...

| A discrete-time queueing system operating under a two-level, consistent priority service policy is studied in this paper. The consistency of the policy guarantees that no low priority customer will be served before a previously (or simultaneously) arrived high priority one. Unlike the well known head of the line priority policy (which is consistent), the considered policy provides for limited...

Future government IP networks must satisfy mission-critical QoS requirements that are introduced by high-priority customers. A prime example includes the Multi-level Precedence and Preemption (MLPP)-like requirements. This paper will focus on the challenges in satisfying these needs in future government IP networks.

0360-8352/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.cie.2011.03.003 q This manuscript was handled by area editor Jame ⇑ Corresponding author. E-mail addresses: [email protected] (C. Kim), du A two-stage multi-server tandem queue with two types of processed customers is analyzed. The input is described by the Marked Markovian Arrival Process (MMAP). The first stage has an infinite n...

This paper describes a novel cost-driven disk scheduling algorithm for environments consisting of multi-priority requests. An example application is a video-on-demand system that provides high and low quality services, termed priority 2 and 1, respectively. Customers ordering a high quality (priority 2) service pay a higher fee and are assigned a higher priority by the underlying system. Our pr...

We investigate the use of priority mechanisms when assigning service engineers to customers as a tool for service differentiation. To this end, we analyze a nonpreemptive M/P H/c priority queue with various customer classes. For this queue, we present various accurate and fast methods to estimate the first two moments of the waiting time per class given that all servers are occupied. These wait...

the decision to buy, sell, design and construct residential apartments is a complex process due to a combination of multiplequalitative and quantitative factors. it thus requires a great deal of costs and time for decision makers in this market. identifying these factors and determining the priority of them are importance for selectingan apartment. the aim of current research is to identify the...