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嵌入式Email系统是类PC嵌入式系统,是嵌入式操作系统及其应用软件的一个重要组成部分,但是现有PC上的嵌入式Email系统都不能适应类PC嵌入式系统的硬件环境要求。文中采用了一种新的构建嵌入式Email系统的方法,设计与实现了清华嵌入式Email系统,可根据各种类PC嵌入式系统的不同要求进行定制。首先,论述了类PC嵌入式系统的硬件平台对嵌入式Email系统的苛刻要求,其次,描述了清华嵌入式Email系统的体系结构,接着,讨论了清华嵌入式Email系统的实现机制与原理,以及系统模型,最后,给出了嵌入式Email系统的特点。由于采用了现在流行的一种开放源码的组件,使得整个系统功能完善,并能够完全符合类PC嵌入式系统的要求。嵌入式Email系统已经在自主研制的掌上电脑HPC和交互式网络电视上成功地运行。 相似文献
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对CAPP系统的发展进行了分析,针对要提高CAPP系统的协同化和实用化水平,论述了基于Web Service的CAPP系统的设计体系结构,详细介绍了该系统的各功能模块,采用XML对CAPP中的工艺规程数据进行了详细描述.基于Web Service的CAPP系统从底层改变CAPP系统的模型,为真正实现CSCW的CAPP系统提供了新的手段. 相似文献
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基于无线通信的远程测控系统的研究 总被引:3,自引:1,他引:2
针对有线通信测控系统的不足之处 ,利用工业现场总线 ,提出了一种无线通信的远程测控系统。阐述了测控系统的硬件和软件环境 ,论述了系统结构及其工作原理 ;介绍了系统测控软件的设计 ,设计了使用LabWindows/CVI调用VC编写的DLL的接口程序 ;并以遥控小车作为无线通信远程控制系统的测控对象 ,实现了该系统 相似文献
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文章析了现行系统VOC视频点播系统的不足,自行设计了基于WEB的多媒体课件或其他媒体系统宽带网点播系统MCOD,并介绍了该系统的设计思路、组成结构、实现方案和关键技术。 相似文献
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一种基于Agent的自适应的分布式入侵检测系统 总被引:4,自引:0,他引:4
针对传统分布式入侵检测系统组件之间依赖程度大、系统不够健壮且入侵检测系统自身结构固定不能适应入侵的变化的问题,提出了一种基于Agent的自适应的分布式入侵检测系统(简称AAADIDS).AAADIDS采用Agent概念重新构造系统的组件,改进了分布式入侵检测系统由于高层节点单一无冗余而产生的可靠性差的缺陷,从构造上克服了分布式入侵检测系统的脆弱性.同时,AAADIDS系统采用智能技术构建了自适应的入侵检测系统模型,增加了系统应对入侵行为变化的智能性.AAADIDS系统相对于传统的分布式入侵检测系统有效地提高了系统自身的可靠性和针对外界变化的适应能力. 相似文献
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基于工业以太网的监控系统进行研究与设计,介绍了基于工业以太网的监控系统的解决方案,对其中包括系统体系结构设计,系统监控软件设计,监控系统的功能设计,监控系统的网络通信和监控系统的安全性进行了探析。 相似文献
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基于COM技术的桌面视频会议系统的实现 总被引:1,自引:0,他引:1
简要介绍了视频会议系统的软件体系结构及NetMeeting SDK的编程接口, 详细介绍了利用NetMeeting SDK提供的COM组件构建桌面视频会议系统的过程.系统采用VC 6.0和COM技术开发,大大缩短了系统的开发时间,同时也提高了应用系统的兼容性和强壮性. 相似文献
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基于AHP模型的政府系统职能评价方法的研究 总被引:1,自引:0,他引:1
政府人力资源系统与政府职能密切相关,研究政府人力资源必须从政府职能的视角对政府系统的要素与职能的关系进行分析.在政府系统的环境适应性概念模型的基础之上,通过对政府系统的政治职能、经济职能、社会职能、文化职能的分析,研究了政府系统要素与职能、规模关系,明确了政府系统的目标是政府系统内部结构分析的出发点,是政府系统目的的具体化的特征,确定了政府系统的目标集,构建了政府职能评价的递级层次结构模型,并通过AHP方法,构建了政府系统职能评价模型. 相似文献
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In this paper, we mainly study the global robust exponential stability of the neural networks with possibly unbounded activation functions. Based on the topological degree theory and Lyapunov functional method, we provide some new sufficient conditions for the global robust exponential stability. Under these conditions, we prove existence, uniqueness and global robust exponential stability of equilibrium point. In the end, some examples are provided to demonstrate the validity of the theoretical results. 相似文献
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This paper considers the existence of the equilibrium point and its global exponential robust stability for reaction-diffusion
interval neural networks with variable coefficients and distributed delays by means of the topological degree theory and Lyapunov-functional
method. The sufficient conditions on global exponential robust stability established in this paper are easily verifiable.
An example is presented to demonstrate the effectiveness and efficiency of our results. 相似文献
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This article considers the robust exponential stability of uncertain switched stochastic systems with time-delay. Both almost sure (sample) stability and stability in mean square are investigated. Based on Lyapunov functional methods and linear matrix inequality techniques, new criteria for exponential robust stability of switched stochastic delay systems with non-linear uncertainties are derived in terms of linear matrix inequalities and average dwell-time conditions. Numerical examples are also given to illustrate the results. 相似文献
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In this article, the problem of robust exponential stability and reliable stabilisation for a class of continuous-time networked control systems (NCSs) with a sample-data controller and unknown time-varying sampling rate is considered. The analysis is based on average dwell-time, Lyapunov–Krasovskii functional and linear matrix inequality (LMI) technique. The delay-dependent criteria are developed for ensuring the robust exponential stability of the considered NCSs. The obtained conditions are formulated in terms of LMIs that can easily be solved by using standard software packages. Furthermore, the result is extended to study the robust stabilisation for NCS with parameter uncertainties. A state feedback controller is constructed in terms of the solution to a set of LMIs, which guarantee the robust exponential stabilisation of NCS and the controller. Finally, numerical examples are presented to illustrate the effectiveness of the obtained results. 相似文献
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Exponential stability and robust exponential stability relating to switched systems consisting of stable and unstable nonlinear subsystems are considered in this study. At each switching time instant, the impulsive increments which are nonlinear functions of the states are extended from switched linear systems to switched nonlinear systems. Using the average dwell time method and piecewise Lyapunov function approach, when the total active time of unstable subsystems compared to the total active time of stable subsystems is less than a certain proportion, the exponential stability of the switched system is guaranteed. The switching law is designed which includes the average dwell time of the switched system. Switched systems with uncertainties are also studied. Sufficient conditions of the exponential stability and robust exponential stability are provided for switched nonlinear systems. Finally, simulations show the effectiveness of the result. 相似文献
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Improved exponential estimates and a new sufficient condition for the exponential stability of neutral type time‐delay systems are established in terms of linear matrix inequalities (LMIs). A new Lyapunov‐Krasovskii functional candidate with appropriately constructed exponential terms is introduced to prove the exponential stability and to reduce the conservatism. For the uncertain case, a corresponding condition for the robust exponential stability is also given. It is shown by numerical examples that the proposed conditions are less conservative than existing results. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
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This paper investigates the stability of network control systems, regarded as a class of large-scale hybrid systems, for ubiquitous computing environment. The problem of robust exponential stabilization for the hybrid systems is addressed, which are composed of impulsive subsystems with time-delay and parameter uncertainties. Using the Lyapunov–Krasovskii functional approach and linear matrix inequality method, an adaptive robust controller is designed to stabilize the uncertain continuous subsystems. Then the delay-dependent exponential stability conditions for the whole hybrid system are derived by analyzing the stability of the subsystems. An example is given to show the effectiveness of the proposed design method. 相似文献
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《国际计算机数学杂志》2012,89(4):443-466
This paper studies the existence, uniqueness and globally robust exponential stability for a class of uncertain neutral-type Cohen–Grossberg neural networks with time-varying and unbounded distributed delays. Based on Lyapunov–Krasovskii functional, by involving a free-weighting matrix, using the homeomorphism mapping principle, Cauchy–Schwarz inequality, Jensen integral inequality, linear matrix inequality techniques and matrix decomposition method, several delay-dependent and delay-independent sufficient conditions are obtained for the robust exponential stability of considered neural networks. Two numerical examples are given to show the effectiveness of our results. 相似文献