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arXiv 1502.00346math.PR
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$G_t/GI/N+GI$流体模型的等效性

Equivalence of Fluid Models for $G_t/GI/N+GI$ Queues

Weining Kang, Guodong Pang

摘要:

最近已经为$G_t/GI/N+GI$队列开发了四种不同的流体模型公式,包括Whitt(2006)中的通过跟踪每个客户的经过的服务和耐心时间的双参数流体模型,Kang和Ramanan(2010)中的测量值流体模型及其在Zu{Zu}iga(2014)中的通过跟踪每个客户的经过的服务和耐心时间的扩展,Zhang(2013)通过跟踪每个客户的剩余服务和耐心时间,建立了一个度量值流体模型。我们发现,两个流体模型跟踪经过时间(惠特和康和Ramanan的流体模型)是等价的配方相同的$G_t/GI/N+GI$队列,而Zu{ZH}iga的流体模型和张的流体模型在一般的初始条件下是不完全等价的。然后,我们确定充要条件,在此条件下,Zu{zu}iga的流体模型和Zhang的流体模型对于同一系统可以相互导出,其中,某些测量值流体过程跟踪每个客户的剩余服务和耐心时间,这些时间来自Kang-Ramanan和Zu{1} iga的流体模型起着重要的作用,发现的等效性质对理解最近的发展提供了重要的启示对于非马尔可夫多服务器队列。

英文摘要:

Four different fluid model formulations have been recently developed for $G_t/GI/N+GI$ queues, including a two-parameter fluid model in Whitt (2006) by tracking elapsed service and patience times of each customer, a measure-valued fluid model in Kang and Ramanan (2010) and its extension in Zu{ñ}iga (2014) by tracking elapsed service and patience times of each customer, and a measure-valued fluid model in Zhang (2013) by tracking residual service and patience times of each customer. We show that the two fluid models tracking elapsed times (Whitt's and Kang and Ramanan's fluid models) are equivalent formulations for the same $G_t/GI/N+GI$ queue, whereas Zu{ñ}iga's fluid model and Zhang's fluid model are not entirely equivalent under general initial conditions. We then identify necessary and sufficient conditions under which Zu{ñ}iga's fluid model and Zhang's fluid model can be derived from each other for the same system, in which certain measure-valued fluid processes tracking residual service and patience times of each customer derived from Kang-Ramanan and Zu{ñ}iga's fluid models play an important role.The equivalence properties discovered provide important implications for the understanding of the recent development for non-Markovian many-server queues.

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