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Performance Analysis for Multimedia Communication Systems with a Multilayer queuing network Model

China Communications 2018年第8期15卷 67-76页

作者： Xuehua Tang Zhongyuan Wang Xiaojun Li Zhen Han Zheng He Youming Fu School of Remote Sensing and Information Engineering Wuhan UniversityWuhan 430079China Research Institute of Wuhan University in Shenzhen Shenzhen 518000China School of Computer Science Wuhan UniversityWuhan 430072China State Grid Economic and Technological Research Institute CO. LTDBeijing 102209China

Software performance evaluation in multimedia communication systems is typically formulated into a multi-layered client-server queuing network(MLCSQN) problem. However, the existing analytical methods to MLCSQN model cannot provide satisfactory solution in terms of accuracy, convergence and consideration of interlocking effects. To this end, this paper proposes a heuristic solving method for MLCSQN model to boost the performance prediction of distributed multimedia software systems. The core concept of this method is referred to as the basic model, which can be further decomposed into two sub-models: client sub-model and server sub-model. The client sub-model calculates think time for server sub-model, and the server sub-model calculates waiting time for client sub-model. Using a breadthfirst traversal from leaf nodes to the root node and vice versa, the basic model is then adapted to MLCSQN, with net sub-models iteratively resolved. Similarly, the interlocking problem is effectively addressed with the help of the basic model. This analytical solver enjoys advantages of fast convergence, independence on specific average value analysis(MVA) methods and eliminating interlocking *** experimental results on accuracy and computation efficiency verify its superiority over anchors.

关键词： multimedia communication system queuing network performance evaluation

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维普期刊数据库

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A queuing network Analysis Model in Emergency Departments 25th

A Queuing Network Analysis Model in Emergency Departments

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第25届中国控制与决策会议

作者： Huabo Zhu Jun Gong Jiafu Tang College of Information Science and Engineering Northeastern University State Key Laboratory of Synthetical Automation for Process Industries (Northeastern University)

ISBN: (纸本)9781467355339

This paper establishes a general multi-stage queuing network model with feedback patient flow to analyze the behavior of patients flow among the stages and the performance of emergency departments（ED） in a hospital. The queuing network is decomposed into a set of single queuing systems that include a tandem queuing and a closed queuing system. The parameter values of the system are obtained from observations through parameter estimation. The complex interaction between the neighbor stages is analyzed and the expression of the patients flow between different stages is calculated in steady state by routing probability in the system. The main performance indicator formulas are developed and results are derived by using the parameter values. Some insights are derived from experiment and numeric analysis in a case study.

关键词： queuing network Emergency Department Analysis Model Performance Indicator

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An analytical method to calculate station evacuation capacity

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Journal of Central South University 2014年第10期21卷 4043-4050页

作者：许心越刘军李海鹰周艳芳 State Key Laboratory of Rail Traffic Control & Safety Beijing Jiaotong University School of Traffic and Transportation Beijing Jiaotong University Research Institute of Highway of Ministry of Transport

The major objective of this work was to calculate evacuation capacity and solve the optimal routing problem in a given station topology from a network optimization perspective where station facilities were modelled as open finite queueing networks with a multi-objective set of performance measures. The optimal routing problem was determined so that the number of evacuation passengers was maximized while the service level was higher than a certain criterion. An analytical technique for modelling open finite queueing networks, called the iteration generalized expansion method(IGEM), was utilized to calculate the desired outputs. A differential evolution algorithm was presented for determining the optimal routes. As demonstrated, the design methodology which combines the optimization and analytical queueing network models provides a very effective procedure for simultaneously determining the service level and the maximum number of evacuation passengers in the best evacuation routes.

关键词： evacuation capacity subway station service level optimal routing queuing network genetic algorithms

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维普期刊数据库

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Analytical　Results　of　Server　Loads　and　network　Load　in　a　General　Client／Server　System

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Tsinghua Science and Technology 1996年第2期1卷 193-196页

作者：金尊和吴澄王然 CIMS-ERC Tsinghua University Beijing 100084

A Macovo queuing network (MQN) based model of a general client/server system with multitype serversand with consideration of the transfer time of the computer network is proposed. The MQN was solved by analyzinga general open MQN with limited clients. In addition, the steady-state probability distribution theorem was ***, analytical load indices such as queue length at the servers and the server efficiency were obtained. Moreover,the sufficient and necessary conditions for server load balance were found. Finally, a client/server system was analyzed to illustrate the procedure for computing system load indices. The results are not only helpful for analyzing bottlenecks in the client/server system, but are also fundamental to static system configuration design.

关键词： client/server system modeling Macovo process queuing network

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