Unreliable M/M/1/1 retrial queues with set-up time

Unreliable M/M/1/1 retrial queues with set-up time
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具有设置时间的不可靠 M/M/1/1 重试队列

DOI:
10.1080/16843703.2017.1320459
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发表时间:
2018-09
影响因子:
2.8
通讯作者:
Wang Jinting
Wang Jinting
中科院分区:
工程技术2区
文献类型:
--
作者:
Chang Jingwei;Wang Jinting

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我们考虑一个带有启动时间和服务台故障的单服务台重试排队。服务器前没有等待空间,到达时不能占用服务器的客户将进入重试轨道,在指数分布的时间后,他们独立于彼此重试。为了节省电力,如果轨道上没有客户,服务器在服务后立即关闭。如果轨道不是空的,服务器将保持空闲状态,等待来自外部或轨道的客户。新来的客户可以重新激活关闭的服务器,服务器需要一些设置时间才能工作。服务器可能无法重新启动。一旦发生故障,将立即修复,修复时间服从指数分布。根据服务器能否完美修复来考虑两种模型。第一种模式与修复不完善有关,修复后服务器仍可能无法激活。在第二种模式中,服务器得到了完美的修复。在这两个模型中,我们都得到了系统队长的平稳分布的显式表达式。对成本最小化问题进行了数值研究,并给出了几个算例。
We consider a single-server retrial queue with set-up time and server breakdown. There is no waiting space in front of the server, and customers who cannot occupy the server upon arrival will go into a retrial orbit and they retry independently of each other after an exponentially distributed time. To save power, the server is turned off immediately after a service if there is no customer in the orbit. If the orbit is not empty, the server will stay idle to wait a customer coming from the external or from the orbit. A newly coming customer can reactivate the off server, and the server needs some set-up time to work. The server may fail to restart. Once failed, it will be repaired immediately and the repair time is exponentially distributed. Two models are considered according to whether the server can be perfectly repaired or not. The first model is concerned with imperfect repair and the server may still fail to activate after repair. In the second model, the server is perfectly repaired. In both models, we get the explicit expressions of stationary distribution of queue length in the system. Cost minimization is studied numerically and several numerical examples are presented.
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