We focus on tandem queues with subexponential service time distributions. We assume that number of customers in front of the first station is infinite and there is infinite room for finished customers after the last station but the size of the buffer between two consecutive stations is finite. Using (max,+) linear recursions, we investigate the tail asymptotics of transient response times and w...

Dimension reduction properties of the act-and-wait controller for systems with feedback delay are analysed. The point of the act-and-wait concept is that the feedback is switched on and off periodically. Earlier works have shown that if the switch-off (waiting) period is longer than the feedback delay, then the system can be described by an n ×n monodromy matrix with n being the dimension of th...

We consider a first-come first-served multiserver queue in the Qualityand Efficiency-Driven (QED) regime. In this regime, which was first formalized by Halfin and Whitt, the number of servers N is not small, servers’ utilization is 1−O 1/√N (Efficiency-Driven) while waiting time is O 1/ √ N (Quality-Driven). This is equivalent to having the number of servers N being approximately equal to R+ √R...

We study the L-spectrum of the Laplace-Beltrami operator on certain complete locally symmetric spaces M = Γ\X with finite volume and arithmetic fundamental group Γ whose universal covering X is a symmetric space of non-compact type. We also show, how the obtained results for locally symmetric spaces can be generalized to manifolds with cusps of rank one.

We study the synchronization of Kuramoto oscillators with all-to-all coupling in the presence of slow, noisy frequency adaptation. In this paper, we develop a model for oscillators, which adapt both their phases and frequencies. It is found that this model naturally reproduces some observed phenomena that are not qualitatively produced by the standard Kuramoto model, such as long waiting times ...

abstract introduction: the amount of waiting time is an indicator of level of access to hospital services and can be measured as one of the indicators of the effectiveness of hospital performance. this study aimed to determine the average waiting time in shahid rahnamoon and afshar clinics. methods: this descriptive, analytical, cross – sectional study was conducted with a simple size of 264 pa...

It has been recently found that a number of systems displaying crackling noise also show a remarkable behavior regarding the temporal occurrence of successive events versus their size: a scaling law for the probability distributions of waiting times as a function of a minimum size is fulfilled, signaling the existence on those systems of self-similarity in time-size. This property is also prese...

â  ba ckground the only curative therapy for end-stage liver disease is transplantation but due to a shortage of available donor livers the waiting list mortality is high. this study aimed to evaluate the outcome and characteristics of patients on the waiting list for liver transplantation in shiraz, southern iran during the period from april 2004 to march 2007. methods medical records of all c...

We propose a real-time computer vision system that enables a UGV to safely cross urban road-intersections. Specifically, when the UGV approaches the stop sign at a 4-way intersection, it must be aware of the vehicles at the other three roads and adhere to traffic rules by waiting for its turn to proceed. The proposed solution consists of three main components: a vehicle detector, a tracker, and...