نتایج جستجو برای: preemptive

تعداد نتایج: 4033  

Journal: :Computers & Industrial Engineering 2013
Yiwei Jiang Jianming Dong Min Ji

This paper addresses a preemptive scheduling problem on two parallel machines with a single server. Each job has to be loaded (setup) by the server before being processed on the machines. The preemption is allowed in this paper. The goal is to minimize the makespan. We first show that it is no of use to preempt the job during its setup time. Namely, every optimal preemptive schedule can be conv...

Journal: :European Journal of Operational Research 2015
Gábor Horváth

In this paper we consider the MMAP/PH/1 priority queue, both the case of preemptive resume and the case of non-preemptive service. The main idea of the presented analysis procedure is that the sojourn time of the low priority jobs in the preemptive case (and the waiting time distribution in the nonpreemptive case) can be represented by the duration of the busy period of a special Markovian flui...

2012
Ashwin Shetty William L. Whittier

The rate of arteriovenous fistula (AVF) placement continues to rise and AVF failure is a major complication. The main cause of AVF failure is stenosis leading to thrombosis. Although the detection of early stenosis with preemptive correction prior to thrombosis seems to be a plausible option to prevent access failure, there is much debate, on the basis of studies of surveillance with arterioven...

Journal: :Clinical microbiology reviews 2003
Ellen Meijer Greet J Boland Leo F Verdonck

The main risk factors for cytomegalovirus (CMV) disease in recipients of allogeneic stem cell transplants (SCT) are recipient CMV seropositivity and acute graft-versus-host disease. Currently, two antiviral strategies, prophylactic or preemptive antiviral treatment, are used for prevention of CMV disease. Preemptive treatment is most favorable when short-term (14-day) treatment is applied. Seve...

2007
Bong K. Yoon Kyung C. Chae

Shanthikumar [10] studied the priority M/G/1 queue with server vacations and found that the difference between the waiting time distribution under the non-preemptive priority and that under the preemptive-resume priority is independent of the vacation policy. We extend this interesting property i) to the generalized vacations which includes the two vacation policies considered by Shanthikumar, ...

Journal: :European Journal of Operational Research 1999
Tony Field Peter G. Harrison

We consider an equilibrium M/M/1 queue in which customers arrive at a random position, both for the preemptive and non-preemptive cases. The Laplace-Stieltjes transforms of their sojourn time distributions are derived and in the latter case it is verified that the result is that of an M/M/1 queue where the server chooses the next task to serve at random.

Journal: :Annals OR 2006
Joris Walraevens Bart Steyaert Herwig Bruneel

In this paper, we analyze a discrete-time preemptive repeat priority queue with resampling. High-priority packets have preemptive repeat priority, and interrupted low-priority packets are subjected to independent retransmission attempts. Both classes contain packets with generally distributed transmission times. We show that the use of generating functions is beneficial for analyzing the system...

2002
Tobias Amnell Elena Fersman Leonid Mokrushin Paul Pettersson Wang Yi

Times is a modelling and schedulability analysis tool for embedded real-time systems, developed at Uppsala University in 2001. It is appropriate for systems that can be described as a set of preemptive or non-preemptive tasks which are triggered periodically or sporadically by time or external events. It provides a graphical interface for editing and simulation, and an engine for schedulability...

1994
Stefan Greiner Gunter Bolch Kishor S. Trivedi

In this paper we consider a non-product form queueing model of a multiprocessor operating system. In order to improve upon model solution time over a discrete-event simulation and a Markov chain based approach, we propose an extension to the shadow technique to allow for any mixture of preemptive and non preemptive priority scheduling strategy combined with class switching. This new technique c...

Journal: :Interfaces 2014
Cynthia Rudin Seyda Ertekin Rebecca J. Passonneau Axinia Radeva Ashish Tomar Boyi Xie Stanley Lewis Mark Riddle Debbie Pangsrivinij Tyler H. McCormick

We summarize the first major effort to use analytics for preemptive maintenance and repair of an electrical distribution network. This is a large-scale multi-year effort between scientists and students at Columbia and MIT and engineers from Con Edison, which operates the world’s oldest and largest underground electrical system. Con Edison’s preemptive maintenance programs are less than a decade...

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