Examples of server

• The server is down again.

• The server crashed.

• We now review the previous research on queuing systems with flexible, failureprone servers and contrast this work with our results.

• The optimal control of a two-stage tandem queueing system with flexible servers.

• Searches using a variety of protein domain servers available on the web failed to ascribe any functional significance to this region.

• Consequently, we performed two sets of numerical experiments aimed at determining the structure of the optimal policy for systems with three unreliable servers.

• Our results indicate that, for these systems, the structure of the optimal policy remains unchanged when the servers are subject to failures.

• We consider a polling system where a group of an infinite number of servers visits sequentially a set of queues.