Many stochastic systems have arrival processes that exhibit clustering behavior. In these
systems, arriving entities influence additional arrivals to occur through self-excitation of the …

Service systems abound with queues, but the most natural direct models are often time-
varying queues, which may require nonstandard analysis methods beyond stochastic …

With the rapid development of modern logistics systems, the unmanned aerial vehicle (aka
drone) based delivery service emerges as a technology-driven innovation, and it is now pilot …

In this paper, we investigate the number of customers that overlap or coincide with a virtual
customer in an Erlang-A queue. Our study provides a novel approach that exploits fluid and …

The multi-server queue with non-homogeneous Poisson arrivals and customer
abandonment is a fundamental dynamic rate queueing model for large-scale service …

We investigate the trade‐off between acquisition and retention efforts when customers are
sensitive to the quality of service they receive, that is, whether they get timely access to a …

The worldwide outbreak of the coronavirus was first identified in 2019 in Wuhan, China.
Since then, the disease has spread worldwide. As it is currently spreading in the United …

Motivated by production systems with nonstationary stochastic demand, we study a double-
ended queueing model having back orders and customer abandonment. One side of our …

With the constantly rising labor cost and deterioration in traffic congestion, the drone-based
service emerges as a game changer for the urban last-mile delivery. Meanwhile, the human …

Long queues in emergency departments (EDs) lead to overcrowding, a phenomenon that
can potentially compromise patient care when medical interventions are delayed. There are …