Performance evaluation of a single-stage two-product manufacturing system operating under pull-type control

This paper presents a model to analyze a manufacturing system that is operating under pull-type control. A Markovian polling model with finite queues is devised to represent the manufacturing system and studied under three cyclic service policies: exhaustive, gated, and a type of limited policy. These polling models are solved by two different methods: an exact approach that requires the complete characterization of the system as a Markov chain and a decomposition approach that reduces the size of the Markov chain. A set of numerical experiments show that the decomposition approach is quite accurate in estimating system performance measures.     

混合服务方式下的轮询服务系统稳定性条件

本文给出在混合服务方式下 ,轮询服务系统稳定性的通用判定条件 .文中的判定条件不但适用于混合式服务 ,同样适用于单一式服务 ,如穷尽式服务、门限式服务和限定式服务等 .对于没有精确解的轮询服务系统 ,如限定式服务( K≠ 1 ) ,仍然可以利用本文的判定条件来判别系统稳定性 .分析表明 ,以往的轮询服务系统稳定性判定条件均是文中的特例 .     

一种建立模糊控制查询表的简单方法和程序

针对建立模糊控制查询表计算工作量大且又费时的问题，介绍了一种建立查询表的简单方法，并用MATLAB语言进行了程序设计。     

宽带接入网络的故障管理算法

随着宽带接入网络技术的发展,如何有效地进行网络管理的问题日益突出。故障管理是网络管理的核心内容。文章提出了将故障轮询机制与监听来自管理代理的Trap消息来检测故障的方法相结合的事件流分析方法。该算法很好地实现了故障检测的功能。     

面向网络故障管理的SNMP分布汇集轮询

对分布网络故障管理中的SNMP轮询进行了研究，分析了SNMP独立集中轮询的不足，给出了一种新的基于代理的分布汇集轮询方法。利用自适应Hash分配策略将轮询任务分配给多个代理完成，代理根据轮询任务汇集规则把多个轮询请求汇集在同一SNMP PDU中进行协议交互，轮询结果用TCP连接和CER编码发送回管理工作站。     

A DISCRETE TIME TWO-LEVEL MIXED SERVICE PARALLEL POLLING MODEL

We present a discrete time single-server two-level mixed service polling systems with two queue types,one center queue and N normal queues.Two-level means the center queue will be successive served aft...     

无线式专家评审智能系统

介绍了一种先进的无线式专家评审智能系统,详细阐述了系统结构、工作原理、硬件组成及软件结构。最后对系统实际应用情况作了说明。     

高密度NAND Flash存取性能及其宿主控制器接口

介绍了高密度K9K8G08U0M NAND flash芯片的内部组成、引脚配置、各种读操作、页面编程、块擦除、写保护等操作时序和状态查询。提供了NAND flash存储器与其宿主控制器的标准接口逻辑。     

Adaptive coordination function for IEEE 802.11 wireless LANs

Multiple access control (MAC) protocols play a significant role in wireless LANs. The IEEE 802.11 MAC protocol specifies two coordination functions that are Distributed Coordination Function (DCF) and Point Coordination Function (PCF). While both DCF and PCF are available in a wireless cell, we propose a novel access mechanism called Adaptive Coordination Function (ACF) to support various classes of traffic. The ACF superframe comprises two periods, one TDMA period designed for real-time traffic and followed by an adaptive period which adaptively employs DCF or PCF to support non-real-time traffic. In this paper, we apply the theory of M/G/1 queues to analyze the performance of adaptive period in terms of queuing delay, end-to-end delay, and saturation throughput. With our analytic model, DCF or PCF can be invoked appropriately according to the number of stations, packet arrival rate, packet payload size, and effective channel bit rate. Analytical results are derived for an extensive throughput and delay performance evaluation of both DCF and PCF.     

基于轮询差异检测和钩子捕获技术的屏幕变化捕捉的研究

从计算机图形化界面诞生起,屏幕共享便成为研究热点。人们一直在寻找一种方式既能减少数据的传输量又能使得用户可以流畅地观看被共享的屏幕．屏幕变化捕捉便是其中之一。在Windows平台下分析讨论轮询差异检测、钩子捕获,以及镜像驱动检测,阐述各种技术的实现原理。设计一款基于轮询差异检测和钩子捕获技术的屏幕变化捕捉系统,通过测试对象．对两种算法其捕获效率以及捕获效果进行对比分析。