This article concerns the identification of the expertise that GI scientists have in common. Rather than attempt to be exhaustive, the approach is to identify a minimal set of expert topics shared across GI science. In this article, a set of five expert topics is proposed for this purpose: structure, uncertainty, dynamism, language and cognition, and design with geographic information. The arti...

We consider a dynamic control problem for a GI/GI/1 + GI queue with multiclass customers. The customer classes are distinguished by their interarrival time, service time, and abandonment time distributions. There is a cost ck > 0 for every class k ∈ {1,2, . . . ,N} customer that abandons the queue before receiving service. The objective is to minimize average cost by dynamically choosing which ...

background: gastrointestinal and liver diseases (gild) are among the most common causes of morbidity and substantial proportion of mortality with enormous economic consequences in iran. we aimed to collect and report the most recent statistics on deaths, symptoms, physician visits, and hospitalizations for common gastrointestinal and liver diseases in gastrointestinal referral centers of tehran...

We establish the validity of the heavy traffic steady-state approximation for a single server queue, operating under the FIFO service discipline, in which each customer abandons the system if his waiting time exceeds his generally-distributed patience time. This follows from early results of Kingman when the loading factor approaches one from below, but has not been shown in more generality. We...