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新世纪之初,以计算机技术和网络通讯技术为主要标志的信息技术,对当今社会产生重大影响,并逐步改变着人们的工作、学习和生活方式,教育也发生着巨大变革.前教育部长陈至立为此撰文指出:“现代教育技术是当代教育的制高点.谁占据了这个山头,谁就在新世纪中处于有利位置.”
因此,将现代化教育技术引进课堂是势在必行的.计算机辅助教学发展至今已进入了多媒体网络化交互式教学阶段.网络化教学是利用计算机作为工具、利用网络技术、多媒体技术和现代教学技术进行教学的一种崭新的教学方式.为此,对如何进行网络化教学、实现网络环境下学生的自主学习,我做了初步的尝试. 相似文献
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计算机网络技术已渗透到社会生活的各个领域,加快了广播音频领域数字化、网络化的发展步伐。在多指挥厅协同指挥的音频扩声系统设计中,运用数字音频传输技术比传统的音频传输有着不可比拟的竞争优势。文章结合多指挥厅音频扩声系统,对CobraNet协议进行分析、阐述,解析了基于CobraNet音频网络传输系统,运用以太网是怎样进行音频传输的新技术。 相似文献
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本文主要论述了新一代网络管理模式下的调度集中系统New Generation CTC(FZK-CTC),在铁路跨越式发展的新形势下,在计算机技术、通信技术、信号技术高度发达以及DMIS系统成功实施的基础上,提出一种新型的行车指挥和信号控制设备,同时也将带来一种新的高效的运输组织管理模式. 相似文献
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随着科学技术的不断发展,多媒体网络化的教学模式越来越受到重视.以学生为主体、语言技能训练为主要内容的多媒体网络化外语教学模式符合大学英语的课堂教学特点,能有效提高其教学效率,达成教学目的.结合教学理论,教学模式和教学实际,就多媒体网络化的大学英语教学进行浅析. 相似文献
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大力发展公共交通，实现数字化、智能化城市公交管理，是适合中国国情的现代化火中城市发展的必然要求。
针对上述情况提出了公交管理调度系统解决方案。采用GPS卫星定位技术与GPRS通用分组无线业务相结合，实现对移动车辆的全天候的监控、报警、指挥和调度的功能。
该方案由指挥监控中心系统、安装在每辆车上的移动系统、GPRs通信网络单元及车辆信息管理系统4个部门构成。
指挥监控系统通过GPRS通信网络单元接收到车辆位置信息进行处理，在大屏幕上实时显示出当前监控车辆的准确位置。
车载移动系统利用每辆车上的GPS接受器将每辆车的位置、时间和车辆编号发送到指挥监控系统，利用集中差分GPS技术，在大屏幕上实时显示出当前监控车辆的准确位置。
利用单片机控制GPRS手机收发短信和发送GPS定位数据，完成车辆与指挥中心之间的联络。
车辆信息管理系统，负责对公交公司所有车辆信息进行管理，建立数据库服务器，存储所有车辆及司机的信息。 相似文献
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广西广播电视安全播出监测调度指挥系统是一个集监测、预警信息发布、调度指挥功能于一体的技术先进、功能齐全、反应快捷、数据准确的数字化、网络化、高度自动化的广播电视安全播出监测调度指挥系统,为合理、有效管理广播电视播出系统提供了有效的技术途径. 相似文献
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行车调度责任和关系事故在调度工作中时有发生,有些性质相当严重.这说明在调度指挥各个环节上存在潜伏的不安全因素.分析行车调度事故发生的根源有助于提高安全指挥的自觉性,推动安全指挥工作的发展. 相似文献
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《Journal of The Franklin Institute》2006,343(4-5):468-479
Wideband code division multiple access (WCDMA) is selected as the air interface scheme for 3G wireless networks. This scheme offers a high data rate that makes the wireless networks a suitable environment for real-time packet data services. 3G networks can be used to deliver multimedia traffic with guaranteed quality of service, but faces the scalability challenge in terms of the number of connections that can be setup in the cellular network. The more connections take place in WCDMA based network, the more interference is created, which yields more QoS degradation. To handle this issue, several algorithms that are collectively alleviate the QoS degradation have been developed and implemented. In this paper, we provide a system link simulator that models the WCDMA cellular network with the necessary radio resource management algorithms. The downlink direction has been simulated as it is usually the limiting link in setting up multimedia sessions, and interactive web sessions. The simulation environment provides, through the implementation of new wrap-around technique, a fair source of intra-cell and inter-cell interference, and avoids session disconnections due to the limited simulation area. Then, we suggest an admission control algorithm for admitting immediate and advance radio resource reservation requests. The admission control algorithm decision is based on the amount of interference that the new request will add to the network. The algorithm relies on the radio resource reservation states that stores all admitted immediate and advance sessions. 相似文献
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《Journal of The Franklin Institute》2022,359(11):5458-5487
In this paper, a novel fast attitude adaptive fault-tolerant control (FTC) scheme based on adaptive neural network and command filter is presented for the hypersonic reentry vehicles (HRV) with complex uncertainties which contain parameter uncertainties, un-modeled dynamics, actuator faults, and external disturbances. To improve the performance of closed-loop FTC, command filter and neural network are introduced to reconstruct system nonlinearities that are related to complex uncertainties. Compared with the FTC scheme with only neural network, the FTC scheme with command filter and neural network has fewer controller design parameters so that the computational complexity is decreased and the control efficiency is improved, which is of great significance for HRV. Then, the adaptive backstepping fault-tolerant controller based on command filter and neural network is designed, which can solve the complexity explosion problem in the standard backstepping control and the small uncertainty problem in the backstepping control only containing command filter. Moreover, to improve the approximation accuracy of the neural network-based universal approximator, an adaptive update law of neural network weights is designed by using the convex optimization technique. It is proved that the presented FTC scheme can ensure that the closed-loop control system is stable and the tracking errors are convergent. Finally, simulation results are carried out to verify the superiority and effectiveness of the presented FTC scheme. 相似文献
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高校多媒体教室具有数量多、规模大、分布广等特征,早期传统多媒体教室在使用中逐渐暴露出诸多弊端,急需升级改造。新的多媒体教室将为高校提供一种更为先进的教学平台。以山东工商学院为例,分析了传统多媒体教室在使用及其管理过程中存在的问题,探讨了基于网络中控环境下的多媒体教室建设方案。 相似文献
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远程教育的方法与模式研究 总被引：1，自引：0，他引：1
To follow the development and popularization of network technology and multimedia technology, remote edu-cation has devdoped quickly in recent years.In this article, the method and scheme of remote education are introduced, the characteristics of remote education are studied.Finally, the new scheme of remote education and its development in the future are discussed. 相似文献
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Distributed finite-time adaptive consensus tracking control for multiple AUVs with state constraints
《Journal of The Franklin Institute》2021,358(17):9158-9177
Aiming at the consensus tracking control problem of multiple autonomous underwater vehicles (AUVs) with state constraints, a new neural network (NN) and barrier Lyapunov function based finite-time command filtered backstepping control scheme is proposed. The finite-time command filter is utilized to filtering the virtual control signal, the error compensation signal is constructed to eliminate filtering error due to the use of filter, and the NN approximation technology is used to deal with the unknown nonlinear dynamics. The control scheme can guarantee that the consensus tracking errors of position states converge into the desired neighborhood of the origin in finite-time while not exceeding the predefined constraints. Finally, simulation studies prove the feasibility of proposed control algorithm. 相似文献
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结合实例阐述多媒体技术在舞台演出及其电视、网络直播应用中,虚拟预演越来越重要,运用虚拟技术拓展真实舞台空间、实时交互技术应用日渐普遍、科技手段融合运用的变化趋势。 相似文献
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This paper develops a robust adaptive neural network (NN) tracking control scheme for a class of strict-feedback nonlinear systems with unknown nonlinearities and unknown external disturbances under input saturation. The radial basis function NNs with minimal learning parameter (MLP) are employed to online approximate the uncertain system dynamics. The adaptive laws are designed to online update the upper bound of the norm of ideal NN weight vectors, and the sum of the bounds of NN approximation errors and external disturbances, respectively. An auxiliary dynamic system is constructed to generate the augmented error signals which are used to modify the adaptive laws for preventing the destructive action due to the input saturation. Moreover, the command filtering backstepping control method is utilized to overcome the shortcoming of dynamic surface control method, the tracking-differentiator-based control method, etc. Our proposed scheme is qualified for simultaneously dealing with the input saturation effect, the heavy computational burden and the “explosion of complexity” problems. Theoretical analysis illuminates that our scheme ensures the boundedness of all signals in the closed-loop systems. Simulation results on two examples verify the effectiveness of our developed control scheme. 相似文献
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《Journal of The Franklin Institute》2023,360(4):2976-3000
This study presents an output backstepping control architecture based on command filter via Multilayer-Neural-Network Pre-Observer with compensator to realise the reference signal tracking of an arbitrarily switching nonlinear systems with nonseperated parameter. First, a multilayer neural network pre-observer is designed before backstepping procedures to servo reconstruct the system states which can not be obtained directly. The pre-observer has superior performance in neutralizing the states abrupt chattering caused by the arbitrarily switching parameter entered in the nonlinear structure. Next, observer error compensation mechanism is designed to compensate the state estimation and shrink the approximation error domain further. Then, the backstepping controller with compensation signal based on command filter is presented to realise the stable reference signal tracking. Last, the proposed control scheme guarantees the states of the closed-loop system bounded. This mechanism makes up the shortcoming of the traditional state observer and give more flexibility in reconstructing the systems states timely, then overcomes the obstacle of the arbitrarily switching parameterized system. Furthermore, compared with the existing traditional uniform robust uncertain controller, the developed backstepping control method combining with the pre-observer not only guarantees the states servo reconstruction and servo control of the switched system, but also improves the tracking performance. Finally, a low-velocity servo turnable switched system is extensively simulated to demonstrate the effectiveness of the developed controller. 相似文献
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本文通过对移动学习、协同学习与联通主义等概念的介绍,结合目前国内研究发展现状,对互动性设计的必要性、可行性和主要方向进行了阐述。3G/4G网络的发展及智能手机的普及为移动学习提供了更加良好的社交平台,联通主义的学习观也证明建立互动管道比管道中的内容更加重要。 相似文献