支持产品创新的分散网络化制造

阐述了产品创新与对企业赢得竞争的重要性，分析了产品快速开发的支撑体系，并通过实例描述了分散网络化制造的全过程，这种网络联盟企业将对我国制造业提高产品创新能力，缩短新产品上市周期、提高产品开发质量、快速响应市场产生显著的效果。     

制造网络信息系统中企业客户端安全技术研究

阐述了制造系统和制造模式的发展所带来的网络信息安全问题.从制造网络信息系统的体系结构出发,分析了客户机/服务器形式的制造系统的安全需求,提出企业客户端安全是其中的薄弱环节.将客户端访问服务器的关键技术归纳为身份认证和访问控制两大方面加以详细论述,并针对基于应用服务供应商模式的网络化制造系统客户端安全问题,提出了相应的解决方案和实施策略.     

移动机器人网络控制系统建模分析

论述当前网络控制系统模型中存在的主要问题,考虑四轮移动机器人作为网络控制系统的被控对象,建立了该系统的传递函数和状态方程模型,通过仿真结果讨论了采样周期对移动机器人作为被控对象网络控制系统稳定性的影响.     

高校科技期刊的现状及未来发展分析

分析了高校科技期刊的现状与问题,认为高校传统的期刊运行模式已使得高校科技期刊难以继续获得更大的发展,要改变现状寻求新的突破,应该走专业化、集团化、网络化、法治化的道路.     

太原市集中供热双热源联网运行方案的分析

从优化供热系统工况，提高供热的经济性出发，利用HACNET软件对太原市集中供热双热源联网系统理想运行方案进行了可及性分析，确定了理想运行方案的运行调节方式。     

闭环网络控制系统全数字仿真实验方法的研究

提出网络控制系统全数字仿真的方法，针对目前Matlab没有提供NCS仿真模块的现状，设计出能够真实再现网络环境的延时模块，并在此基础上开发出一套完整的网络控制仿真实验平台，只需一台计算机就能够完成包括网络数据包丢失和时序错乱等现象在内的各种NCS仿真实验，保证在进行NCS控制算法的比较研究时，网络延时状况是一致的。在该实验平台上进行NCS全数字仿真实验，结果证明以上方法的有效性。     

Ho∞-based fault detection for nonlinear networked systems with random packet dropout and probabilistic interval delay

The fault detection problem for the nonlinear networked control system (NCS) with packet dropout and delay is investigated.A nonlinear stochastic system model is proposed to account for the NCS with random packet dropout and networkinduced non-uniformly distributed time-varying delay in both from sensor to controller (S/C) and from controller to actuator (C/A).Based on the obtained NCS model,employing an observer-based fault detection filter as the residual generator,the addressed fault detection problem is converted into an auxiliary nonlinear H∞ control problem.Then,with the help of Lyapunov functional approach,a sufficient condition for the desired fault detection filter is constructed in terms of certain linear matrix inequalities,which depend on not only the delay interval but also the delay interval occurrence rate and successful packet communication rate.Especially,a trade-off phenomenon between the maximum allowable delay bound and successful data packet transmission rate is found,which is typically resulted from the limited bandwidth of communication networks.The effectiveness of the proposed method is demonstrated by a simulation example.     

H_∞-based fault detection for nonlinear networked systems with random packet dropout and probabilistic interval delay

The fault detection problem for the nonlinear networked control system(NCS) with packet dropout and delay is investigated.A nonlinear stochastic system model is proposed to account for the NCS with random packet dropout and networkinduced non-uniformly distributed time-varying delay in both from sensor to controller(S/C) and from controller to actuator(C/A).Based on the obtained NCS model,employing an observer-based fault detection filter as the residual generator,the addressed fault detection problem is converted into an auxiliary nonlinear H∞ control problem.Then,with the help of Lyapunov functional approach,a sufficient condition for the desired fault detection filter is constructed in terms of certain linear matrix inequalities,which depend on not only the delay interval but also the delay interval occurrence rate and successful packet communication rate.Especially,a trade-off phenomenon between the maximum allowable delay bound and successful data packet transmission rate is found,which is typically resulted from the limited bandwidth of communication networks.The effectiveness of the proposed method is demonstrated by a simulation example.     

基于改进遗传算法的废旧家电回收网络模型研究

废旧家电作为可再生资源的一种,其体积大、回收价值高等特点引起了人们广泛关注,合理规划废旧家电回收网络是目前许多专家学者关注的问题.以上海某家废品回收公司为背景,深入研究废旧家电回收体系结构,建立居委会和交投站两层废旧家电回收网络结构模型,然后提出了改进遗传算法的数学模型并进行实例计算,最后对模型进行灵敏度分析从而获取较...     

依托地铁发展整合广州站域公共空间资源

广州地铁的网络化发展正在逐步走向成熟,城市公共空间在"以公交为导向"的城市规划理念(TOD)下,依托地铁发展,有效地整合功能和建立有地域性特征的发展模式是其中的关键环节.文中通过对现状和问题的分析、比较研究,用系统科学的方法,提出以地铁车站为核心、步行系统为联系纽带,形成网络化的站域公共空间体系.