Esma Senturk Gel

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To gain insight into the potential logistical beneets of worker cross-training and agile workforce policies, we study simple models of exible workers in serial production systems. The primary control issue is how to assign workers to jobs/stations over time. Under assumptions of complete worker exibility and collaborative work, we prove that a simple(More)
Most web servers, in practical use, use a queuing policy based on the Best E8ort model, which employs the 9rst-in-9rst-out (FIFO) scheduling rule to prioritize web requests in a single queue. This model does not provide Quality of Service (QoS). In the Di8erentiated Services (Di8Serv) model, separate queues are introduced to di8erentiate QoS for separate(More)
The dynamics and throughput of a bucket brigade production system is studied when workers speeds increase due to learning. It is shown that, if the rules of the bucket brigade system allow a re-ordering of its workers then the bucket brigade production system is very robust and will typically rebalance to a self-organizing optimal production arrangement. As(More)
Previous work on the dynamics of bucket brigades has focused on systems in which workers can be ordered with respect to their speeds and where this ordering does not change throughout the line. While this assumption is valid in most environments, it may not be satisfied in some. We consider such environments and explore the conditions under which bucket(More)
Ambulance diversion (AD) is used by emergency departments (EDs) to relieve congestion by requesting ambulances to bypass the ED and transport patients to another facility. We study optimal AD control policies using a Markov Decision Process (MDP) formulation that minimizes the average time that patients wait beyond their recommended safety time threshold.(More)