共查询到20条相似文献，搜索用时 31 毫秒
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This paper investigates the exponential synchronization problem of some chaotic delayed neural networks based on the proposed general neural network model, which is the interconnection of a linear delayed dynamic system and a bounded static nonlinear operator, and covers several well-known neural networks, such as Hopfield neural networks, cellular neural networks （CNNs）, bidirectional associative memory （BAM） networks, recurrent multilayer perceptrons （RMLPs）. By virtue of Lyapunov- Krasovskii stability theory and linear matrix inequality （LMI） technique, some exponential synchronization criteria are derived. Using the drive-response concept, hybrid feedback controllers are designed to synchronize two identical chaotic neural networks based on those synchronization criteria. Finally, detailed comparisons with existing results are made and numerical simulations are carried out to demonstrate the effectiveness of the established synchronization laws. 相似文献
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LIU Jiao-min FAN Tong-rang TONG Kuan-zhang 《浙江大学学报(A卷英文版)》2007,8(3):464-468
With the current development trend of Ethernet gradually towards the control network of plant-floor layer and devices layer, much management information on Intelligent Circuit Breaker Controller (ICBC) is becoming distributed and networked. This paper describes a mixing structure of complex industrial field control network based on Ethernet frame, then mainly discusses three network management methods of ICBC, such as the interconnection method based on PCI, embedded gateway and em- bedded Web server. At the same time, it also gives the basic hardware framework of implementing interconnection, the type of main components, and the real-time operation system supporting the embedded TCP/IP protocols and Web server. 相似文献
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黄淑玲 《韩山师范学院学报》2010,31(3):53-56
随着无线互联网的发展,第3代移动通信系统（3G）与无线局域网（WLAN）的互连也成为研究的热点.文章介绍了WLAN与3G互连的融合方案,并分析了互连的认证、计费、安全等问题,最后给出校园WLAN与3G网融合的例子. 相似文献
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1 互连网络1.1 基本概念1.1.1互连网络。 互连网络是一种由开关元件按照一定拓扑结构和控制方式构成的网络,用来实现计算机系统内部多个处理机或多个功能部件之间的相互连接。1.1.2 互连函数。 为了反映不同互连网络的连接特性,每种互连网络可用一组互连函数来描述 如果将互连网络的N个输入端和N个输出端分别用0,1,2,…,N-1来表示,则互连函数表示相互连接的输入端和输出端号之间的一一对应关系.或者说,存在互连函数f,在它的作用下,输入i应与f（i）相连,这里: 0<=i<=N-1表示互连函数常用两种方法:函数表示法和输入输出对应表示法。基本互连函数有如下几种: 1）恒等置换: 相似文献
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The combined use of dry cooling （DC） system and dedicated ventilation （DV） system to decouple cool-ing and dehumidification process for energy efficiency was proposed for subtropical climates like Hong Kong. In this study, the energy performance and condensation risk of the use of DCDV system were examined by analyzing its ap-plication in a typical office building in Hong Kong. Through hour-by-hour simulation using actual equipment per-formance data and realistic building and system characteristics, it was found that with the use of DCDV system, the annual energy consumption could be reduced by 54%in comparison with the conventional system （constant air vol-ume with reheat system）. In respect of condensation risk, it was found that the annual frequency of occurrence of con-densation on DC coil was 35 h. Additional simulations were conducted to examine the influence of different parame-ters on the condensation risk of DCDV system. Measures to ensure condensate-free on DC coil were also discussed. 相似文献
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吴金洲 《中小学实验与装备》1996,(1)
微机局域网的构成及发展湖北省教育技术装备处吴金洲（４３００７０）一、概述所谓计算机网络就是通过通信线路互连起来的自治的计算机集合。在当今计算机领域中，网络通信技术是一项十分热门的技术，而局域网络（ＬｏａｄＡｒｅａＮｅｔｗａｒｅ，简称ＬＡＮ）技术是计算... 相似文献
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Voltage source converter high-voltage direct current （VSC-HVDC） is a new power transmission technology pref- erable in small or medium power transmission. In this paper we discuss a new control system based on space vector modulation （SVM） without any voltage line sensors. Using direct power control （DPC） SVM and a new double synchronous reference frame phase-locked loop （DSRF-PLL） approach, the control system is resistant to the majority of line voltage disturbances. Also, the system response has accelerated by using a feed forward power decoupled loop. The operation of this control strategy was verified in a SIMULINK/MATLAB simulation environment. To validate this control system, a 5 kV.A prototype system was constructed. Compared to the original controllers, the current total harmonic distortion （THD）, the active and reactive deviations and the DC voltage overshoot were lowered by 2.5%, 6.2% and 8%, respectively. The rectifier power factor in the worst condition was 0.93 and the DC voltage settling time was 0.2 s. 相似文献
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Bülent 《浙江大学学报(A卷英文版)》2010,11(2):106-114
In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively. 相似文献
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张燕云 《中学英语之友(教育研究与实践)》2010,(7):4-4
（A）Poor Pluto
随着中国探月计划的实施,又掀起了一股新的太空热,在这热闹的背后可怜的冥王星却早已不属于九大行星的行列。这是为什么呢？Are there nine planets（行星）in the solar system（太阳系）？ 相似文献
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In order to utilize solar energy effectively and to achieve a higher electrical efficiency by limiting the operating temperature of the photovoltaic （PV） panel, a novel photovoltaic/thermal solar-assisted heat pump （PV/T-SAHP） system was proposed and constructed. The hybrid solar system generates electricity and thermal energy simultaneously. A distributed parameters model of the PWT-SAHP system was developed and applied to analyze the system dynamic performance in terms of PV action, photothermal action and Rankine cycle processes. The simulation results indicated that the coefficient of performance （COP） of the proposed PV/T-SAHP can be much better than that of the conventional heat pump. Both PV-efficiency and photothermic efficiency have been improved considerably. The results also showed that the performance of this PV/T-SAHP system was strongly influenced by the evaporator area, tube pitch and tilt angle of the PV/T evaporator, which are the key factors in PV/T-SAHP system optimization and PV/T evaporator design. 相似文献
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Effective assessment is vital in educational activities. We propose IWAS （intelligent Web-based assessment system）, an intelligent, generalized and real-time system to assess both learning and teaching. IWAS provides a foundation for more efficiency in instructional activities and, ultimately, students＇ performances. Our contributions are summarized as （1） Given the causes （student knowledge levels and learning styles）, BN （Bayesian Networks） technique is utilized to automatically reason on the probabilities of the presence of the effects （learning outcomes）; （2） The absence of teaching practice assessments is addressed via the feedbacks from three different levels, aiming to correlate the teaching assessment with the learning assessments for the improved effectiveness in instructional activities; （3） Under a client/server architecture, IWAS is decomposed into a set of independent modules; through the standard inter-module interfaces, the flexibility of easy maintenance makes IWAS a generalized system adaptable to different domains; and （4） Web technologies are integrated to deliver the formative feedbacks to users in a timely manner 相似文献
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程卿 《天津工程师范学院学报》2011,21(3)
根据国家自然科学基金委的通知,我校获得3项国家自然科学基金“面上项目”,分别是宣兆成教授申请的国家自然科学基金项目“基于Flux—Free上界估计的非线性力学有限元分析验证方法研究”（项目批准号：11172209）、崔世钢教授申请的国家自然科学基金项目“高速率并行光互连器件的基础科学问题研究”（项目批准号：61178048）、赵丽教授申请的国家自然科学基金项目“LED光源的人眼视网膜医学安全性及视功能影响机理研究”（项目批准号：61178081）。 相似文献
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In the face of continuous changes taking place in the education system, universities have to traverse mode 1 （teaching and knowledge production）, mode 2 （co-production of knowledge with heterogeneous groups）, and mode 3 （encompassing social responsibility）. In this embracing an entrepreneurial and innovation ensuring a quality education combined with context, two aspects begin to gain prominence for universities： （1） ethos integrated with productive societal relationships; and （2） a superior experience for its learners. This paper undertakes a comprehensive meta-analysis of the literature matched with emerging systemic trends to argue the challenges associated with creating a productive higher education system. 相似文献
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Performance of biological phosphorus removal and characteristics of microbial community in the oxic-settling-anaerobic process by FISH analysis 总被引：1，自引：0，他引：1
Jian-fang Wang Qing-liang Zhao Wen-biao Jin Shi-jie You Jin-na Zhang 《浙江大学学报(A卷英文版)》2008,9(7):1004-1010
Performance of biological phosphorus removal in the oxic-settling-anaerobic （OSA） process was investigated. Cell staining and fluorescent in situ hybridization （FISH） were used to analyze characteristics and microbial community of sludge. Experimental results showed that phosphorus removal efficiency was near 60% and the amount of biological phosphorus accumulation in aerobic sludge of the OSA system was up to 26.9 mg/g. Biological phosphorus removal efficiency was partially inhibited by carbon sources in the continuous OSA system. Contrasted to the OSA system, biological phosphorus removal efficiency was enhanced by 14% and the average total phosphorus （TP） contents of aerobic sludge were increased by 0.36 mg/g when sufficient carbon sources were supplied in batch experiments. Staining methods indicated that about 35% of microorganisms had typical characteristics of phosphorus accumulating organisms （PAOs）. FISH analysis demonstrated that PAOMIX-binding bacteria were predominant microbial communities in the OSA system, which accounted for around 28% of total bacteria. 相似文献
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校园网内网银速度大比拼 总被引：1，自引：0，他引：1
中同的互联网络是由电信、联通、教育网（CERNET）等几大网络“组合”而成的，由于这几大网络之间互连带宽有限以及NAT、防火墙、多出口等多种因素的影响，导致了网络的互联互通问题。 相似文献
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一、引言所谓计算机网络（以下简称网络）是指将多台可独立工作的计算机通过一定的通信方式互连形成的资源共享系统,每台计算机是通过处理节点与线路进行连接的,每个节点之间可以自由交互信息,实现网络资源的拓展共享。网络等高科技产品的出现是现代社会发展的必然结果, 相似文献