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服务台可修的GI/PH/1排队系统
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摘要
随着当代科学技术的发展,使得经典排队论中的模型在应用中已不足以反映客观事实。复杂计算机通讯网络、信息高速公路、计算机集成制造系统、柔性制造和装配系统等诸多现代领域都提出了大量的排队论问题。近年来,作为经典排队系统的发展和延伸,可修排队系统成为排队理论研究的一个重要领域。这主要是由于这类排队模型与现实的系统更吻合,因此有更广泛的应用前景。
     论文较系统的研究了服务台可修的GI/PH/1排队系统,其中忙期服务台寿命和修复时间也是PH变量。这是一个全新的可修排队模型,是已有文献中模型的推广。首先证明系统在稳态下可转化为一个等价的经典GI/PH/1模型,然后运用矩阵几何解理论和矩阵指数方法给出系统的各种稳态指标。此外,对修复后重新服务和累积服务两类不同接续规则,论文给出了统一的处理。
     全文共分为四章。第一章简述了经典排队系统和可修排队系统的发展历史和应用状况。第二章介绍了位相型分布的封闭性及更新过程。第三章讨论了服务台可修的GI/PH/1排队系统,将模型转化为一个经典的GI/PH/1模型进行研究,并对两类不同的接续规则给出了统一的处理。第四章使用矩阵几何解理论和矩阵指数方法给出了该可修系统稳态下的排队指标和可靠性指标,并证明了队长和等待时间都是广义PH变量。
With the development of contemporary science and technology, the models made in classical queuing theory are not enough to reflect the objective fact. Many fields, such as the complicated computer communication network, information superhighway, the computer integrated manufacture system (CIMS),flexible manufacturing and assembly system, etc., have all put forward a large number of queuing theory questions. In recent years, as the development and extension of classical queuing system, repairable queuing systems have become the main content of study in queuing theory. This is mainly because that these queuing models arc more identical with realistic systems, so there are more extensive application prospects.
     In this thesis, we study the queuing system GI/PH/1 with repairable service station systematically, where the lifetime and the repair time of the service station are both PH random variables. This is a new repairable queuing model, and it’s the promotion of the models in existing literatures. First, we prove that this queuing system can be transformed into the classical queue model GI/PH/1, then, we use the theory of matrix-geometric solutions and the method of matrix-exponential to give several indexes under stationary state. In addition, we give a unified treatment for renew service and cumulative service.
     This thesis is divided into four chapters. In the first chapter, we describe the development history and application status of the classical queuing system and the repairable queuing system. In the second chapter, we introduce the closed nature and update process of phase-type distribution. In the third chapter, we discuss the queuing system GI/PH/1 with repairable service station, and transform this model to a classical GI/PH/1 model to research, and give a unified treatment for renew service and cumulative service. In the fourth chapter, we use the theory of matrix-geometric solutions and the method of matrix-exponential to give the queuing indexes and reliability indexes under stationary state, and prove the queue length and the waiting time are both generalized PH variables.
引文
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