We consider the problem of how best to assign the service effort in a queueing network in order to minimize the expected delay under a cost constraint. We shall study systems with several types of customers, general service time distributions, stochastic or deterministic routing, and a variety of service regimes. For such networks there are typically no analytical formulae for the waiting time ...

We consider the problem of how best to assign the service effort in a queueing network in order to minimise the expected delay under a cost constraint. We shall study systems with several types of customers, general service time distributions, stochastic or deterministic routing, and a variety of service regimes. For such networks there are typically no analytical formulae for the waiting time ...

We consider the problem of how best to assign the service capacity in a queueing network in order to minimise the expected delay under a cost constraint. We study systems with several types of customers, general service time distributions, stochastic or deterministic routing, and a variety of service regimes. For such networks there are typically no analytical formulae for the waiting time dist...

We examine multiple independent sources providing status updates to a monitor through simple queues. We formulate a status-age timeliness metric and derive a general result for the average status age that is applicable to a wide variety of multiuser service systems. An alternate technique for evaluating status age based on stochastic hybrid systems is also introduced. For first-come first-serve...

This paper brings together work in stochastic modelling, using the process algebra PEPA, and work in automated planning. Stochastic modelling has been concerned with verification of system performance metrics for some time: given a model of a system, determining whether it will meet a service-level agreement (SLA). For example, whether a given sequence of transitions on a network will complete ...

civil liability in electronic communications is one the most important issues of information and communications technology (ict) law. civil liability may be arisen from different causes such as copyright and trade mark infringement invasion of privacy and defamation. when discussing civil liability, two different civil liability systems may be considered: direct and indirect civil liability. in...

Complex systems like semiconductor wafer fabrication facilities (fabs), networks of data switches, and large-scale call centers all demand efficient resource allocation. Deterministic models like linear programs (LP) have been used for capacity planning at both the design and expansion stages of such systems. LP-based planning is critical in setting a medium range or long-term goal for many sys...

There exist various service systems that have hierarchical structure. In hierarchical service networks, facilities at different levels provide different types of services. For example, in health care systems, general centers provide low-level services such as primary health care services, while the specialized hospitals provide high-level services. Because of demand congestion in service networ...

Stochastic network calculus is an evolving theory which accounts for statistical multiplexing and uses an envelope approach for probabilistic delay and backlog analysis of networks. One of the key ideas of stochastic network calculus is the possibility to describe the service offered at a network node as a stochastic service envelope, which in turn can be used to describe the stochastic service...