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1.
The proliferation of the wireless network over the last decade is one of the significant drivers for the increased deployment of mobile ad hoc networks (MANETs) in the battle field. It is not practically possible to build a fixed wired network infrastructure in battle field. But it is possible to create a mobile wireless network infrastructure because of the mobility of the soldiers. MANET is justified by the possibility of building a network where no infrastructure exists. MANET with group communication applications and multicasting can highly benefit from a networking environment such as military and emergency uses. In such applications, the used ad hoc networks need to be reliable and secure. In recent years, a specific technique called the universal generating function technique (UGFT) has been applied to determine the network reliability. The UGFT is based on an approach that is closely connected to generating functions that are widely used in probability theory. This work devotes to assess the MANET reliability using the UGFT. Reliability of the MANET is defined as the probability that the transformed message from the source can be passed successfully through the MANET and reached the target without any delay. Two kinds of UGFs are discussed in this work, and an algorithm has been proposed to execute the system reliability. This UGFT is illustrated with a case study in a battlefield environment. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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A unicast-based fault-tolerant multicasting method is proposed for hypercubes, which can still work well when the system contains enough faults. A multicast message may be unable to reach a destination if Hamming distance between the destination and the multicast source is large enough. A multicast message fails if any one of the destinations is unreachable from the source. An effective destination ordering scheme of the destinations is proposed for one-port systems first, it is extended to all-port systems for unicast-based fault-tolerant multicasting. Unreachable destinations from the source based on the local safety information are forwarded to a reachable destination, where the multicast message can be routed reliably. Destination ordering is completed based on Hamming distance. A multiple round p-cube routing scheme is presented for a deadlock-free fault-tolerant routing for each unicast step in hypercubes, where the same virtual channel is used for each round of p-cube routing. Sufficient simulation results are presented by comparing with the previous methods. 相似文献
3.
Many potential applications of Mobile Ad Hoc Networks (MANETs) involve group communications among the nodes. Multicasting is an useful operation that facilitates group communications. Efficient and scalable multicast routing in MANETs is a difficult issue. In addition to the conventional multicast routing algorithms, recent protocols have adopted the following new approaches: overlays, backbone-based, and stateless. In this paper, we study these approaches from the protocol state management point of view, and compare their scalability behaviors.To enhance performance and enable scalability, we have proposed a framework for hierarchical multicasting in MANET environments. Two classes of hierarchical multicasting approaches, termed as domain-based and overlay-driven, are proposed. We have considered a variety of approaches that are suitable for different scenarios such as multicast group sizes and number of groups. Results obtained through simulations demonstrate enhanced performance and scalability of the proposed techniques. 相似文献
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基于非线性效应的全光组播,以其能直接在光域内将信息从单节点路由到多目标节点而受到广泛关注。实验证实了利用色散平坦高非线性光子晶体光纤级联光学滤波器实现全光波长组播的新方案,通过使用窄带光学滤波器次选择自相位调制加宽光谱分量,对速率为40 Gbit/s 的归零信号实现了极性保持、通道间距100 nm 的1 到6 信道全光波长组播。进一步研究了所设计全光波长组播器的动态特性,结果表明,它具有20 nm 的宽带波长调谐范围,同时,对输入信号的光功率波动具有较强的容忍性,系统整体结构简单,在未来透明光子网络中很有应用潜力。 相似文献
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远程教学中COD的组播实现 总被引:1,自引:0,他引:1
本文提出了一种集中式管理、点播服务器分布式放置的远程教学课件点播(Courseware On Demand-COD)系统。在这一体系结构下.采用了新的批处理信道调度策略,对用户实施多播流和补丁流相结合的组播服务。提高了网络带宽利用率,增加了可服务的点播并发流数,同时降低了课件播放延迟时间。 相似文献
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如何克服服务器负载过重造成的瓶颈效应,及如何适应网络的动态变化,是视频会议系统一直面临的问题.提出了一种基于分布式代理的自适应视频会议系统.该系统充分利用当前的网络条件,采用分布式代理,使用应用层组播和IP层组播相结合的混合组播方式,解决了服务器瓶颈问题;采用基于MPEG-4FGS速率修整技术,使系统具有极好的网络自适应性. 相似文献
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介绍IP多路广播技术在广域网中的应用,通过描述TCP/IP协议中IP多路广播的特点和基于卫星数据网的多路广播网络结构,结合多路广播应用软件在休斯综合卫星业务图ISBN上的实现,提供了一种充分利用卫星通信独有的覆盖面广的广播优势和经济有效的传播多媒体信息的技术手段。 相似文献
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随着流媒体、视频等业务在Internet上的相继开展,IP组播技术和应用开始快速发展。本文主要分析IP组播技术的产生、概念和特点,以及相关技术,结合油田开发实际, 介绍了IP组播技术在油田开发监控中的应用。 相似文献