Patient no-shows and cancellations are a significant problem to healthcare clinics, as they compromise clinic's efficiency. Therefore, it is important account for both into the design of appointment systems. To provide additional empirical evidence on no-show cancellation behaviour, we assess outpatient clinic data from two providers in USA EU: rates increase with scheduling interval, which num...

Consider a single-server queue with a renewal arrival process and generally distributed processing times in which each customer independently reneges if service has not begun within a generally distributed amount of time. We establish that both the workload and queue-length processes in this system can be approximated by a regulated Ornstein-Uhlenbeck (ROU) process when the arrival rate is clos...

In many cognitive radio applications, there are multiple types of message queues. Existing queueing analysis works in underlay CR networks failed to discuss packets heterogeneity. Therefore high priority packets with impatient waiting time that have preemptive transmission opportunities over low class are investigated. We model the system behavior as a M/M/1+GI queue which is represented by a t...

Credible delegation of discretion obtains when it is a rational strategy for managers not to overrule employee decisions that are based on delegated decision rights or renege on the level of delegated discretion (and this is common knowledge). Making delegation of discretion credible becomes a crucial issue when organizations want to sustain the advantages that may flow from delegation: Such ad...

Parallel video servers provide highly scalable video-on-demand service for a huge number of clients. The conventional streamscheduling scheme does not use I/O and network bandwidth efficiently. Some other schemes, such as batching and streammerging, can effectively improve server I/O and network bandwidth efficiency. However, the batching scheme results in long startup latency and high reneging...

This paper addresses the problem of designing tractable dynamic admission control and/or routing policies in a Markovian model of parallel multi-server loss queues with reneging, which seek to optimize performance objectives of concern. Such problems are relevant in a variety of systems that provide distributed telecommunication or computing services. The paper shows the direct applicability of...

This paper presents an analysis for an M/M/1/N queueing system with balking, reneging and server vacations. Arriving customers balk (do not enter) with a probability and renege (leave the queue after entering) according to a negative exponential distribution. It is assumed that the server has a multiple vacation. By using the Markov process method, we first develop the equations of the steady s...

The key performance bottleneck for large-scale video-on-demand (VoD) systems is the server bandwidth, which controls the number of clients a video server can support. Two existing stream scheduling schemes can save server bandwidth significantly by using multicast method to transmit video data: the batching scheme and the patching scheme. However, the batching scheme results in long start-up la...

This paper deals with the G/G/R machining system consisting of M operating machines as well as S cold standbys. The concepts of balking and reneging are incorporated which make our model more versatile to deal with real time systems. The broken-down machines are sent to repair facilities consisting of R permanent repairmen. The failure times and repair times are generally identical and independ...