Modelling and Performance Evaluation of High-Performance Networks

如果我们要为高性能通信网络的设计和管理做出基本理论的贡献，我们就承担了以下研究的责任。我们分析了一个地图/G/1队列模型，其中描述了在其他类型的交通可能会中断目标交通流的条件下描述的突发交通源。我们已经对队列模型进行了一次队列分析，该模型在推式缓冲下的假期。如果要预测系统以统一方式的总性能，我们提出了一种面向对象的模拟器的方法，它是由我们的研究小组开发的Asq系统的关键组件之一。我们提出了一个数学模型来评估需求的性能-以优先考虑多媒体流量有效通信在LANs中的有效通信。我们分析了CSMA/CD-PS的性能，其中哪些是支持无线通信网络的多媒体流量的有效协议。我们已经开发了长距离依赖性的突发流量的数学来源描述，以及自我相似性和确认其有效性，并尊重排队行为。我们已经开发了一个模拟模型，以评估来自MPEG视频源的抖动过程，在遍历多台ATM交换机和实验性的试点运行以实现定量评估。在订购评估单元级别ATM交换机的性能时，我们有一个队列模型，在随机的服务顺序下进行查询，并分析该模型以产生性能测量。我们提出了一项接近技术，以评估在一个基于泄漏的桶机制的多路复用器中的细胞丢失可能性，并具有多路复用器的多重输入流。我们提出了一个用于无线移动通信的分层单元模型，以减少呼叫阻塞可能性和处理阻塞可能性，并分析了该模型的性能。

In order to make contribution to the fundamental theory for the design and management of high-performance communication networks, we have carried out the following research.・We have analyzed an MAP/G/1 queueing model which describes bursty traffic source under the condition that other types of traffic may interrupt the target traffic stream.・We have performed the queueing analysis of a queueing model with vacation under push-out buffering.・In order to predict the total performance of systems in a unified way, we have proposed the methodology for object-oriented simulator is one of the key components of asq system being developed by our research group.・We have proposed a mathematical model to evaluate the performance of Demand-Priority for efficient communication of multimedia traffic in LANs.・We have analyzed the performance of CSMA/CD-PS which is an efficient protocol in wireless communication networks supporting multimedia traffic.・We have developed the mathematical source description of bursty traffic of long range dependency and of self-simularity and confirmed its validity with respect to queueing behavior.・We have developed a simulation model to evaluate the jitter process from MPEG video sources after traversing multiple ATM switches and experimented pilot runs to obtain the quantitative evaluation.・In order to evaluate the performance of ATM switches in cell level, we have cosidered a queueing model with retry attemp under random order of service and analyzed the model to derive the performance measures.・We have proposed an approximation technique to evaluate the cell loss probability in a multiplexer with mutiple input streams under a cell smoothing based on leaky bucket mechanism.・We have proposed a hierarchical cell model for wireless mobile communication to diminish the call blocking probability and handoff blocking probablity and analyzed the perormance of the model.