costs. The current paper develops multi-server queuing models to estimate border crossing delay in support of a predictive … traveler information system for the crossings. Two classes of multi-server models are considered: (1) models with exponential …

This paper considers a multiserver retrial queue with two-way communication for blended call centers. Primary incoming … obtained some preliminary results for the multiserver model. In this paper, we present an extensive analysis for the … multiserver model in which, we propose a new formulation by a level-dependent quasi birth-and-death (QBD) process, whose block …