| Article ID: | iaor2007989 |
| Country: | Netherlands |
| Volume: | 34 |
| Issue: | 4 |
| Start Page Number: | 473 |
| End Page Number: | 476 |
| Publication Date: | Jul 2006 |
| Journal: | Operations Research Letters |
| Authors: | Zhang Zhe George |
| Keywords: | M/G/1 queues, vacation models |
In this note, we consider a single server queueing system with server vacations of two types and a two-threshold policy. Under a cost and revenue structure the long-run average cost function is proven to be convex in the lower threshold for a fixed difference between the two thresholds.