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1.
一个两步蓝牙散射网形成算法TBSF   总被引:6,自引:0,他引:6  
蓝牙是一门新兴的低功耗、低成本短距离无线技术,它使便携设备能方便快捷地形成短距离无线网,同时为构建成本低廉的移动自组网带来了新的选择方案.提出一个异步的、完全分布式蓝牙散射网构造算法——TBSF,首先由所有蓝牙节点生成一系列独立匹克网,然后互连匹克网成为散射网.基于节点邻居个数选择主或桥节点,通过一个节点角色转换图确定桥节点充当的角色.任意两个相邻匹克网之间通过惟一的连接路由互连,最终形成一个连通的散射网,主和桥节点构成散射网的一个连通支配集.仿真实验表明,TBSF算法创建散射网具有较好特性.  相似文献
2.
一种新的基于DSR的移动自组网节能路由策略   总被引:5,自引:0,他引:5  
许力  王敏强  郑宝玉 《计算机工程》2004,30(11):43-44,120
移动自组网是由一组带有无线收发装置的移动节点组成的一个支持多跳的临时性的网络自治系统。由于移动自组网的大多数节点是由有限寿命的电池来提供的,因此能量保护策略成为制定路由协议的一个重要依据。该文提出了一种新的基于动态源路由协议的节能路由策略。仿真表明该策略有效地延长了网络的生存时间。并很好地均衡了节约能耗和保护网络传统性能的需求。  相似文献
3.
There is a lack of appropriate guidelines for realistic user traces, mobility models, routing protocols, considerations of real-life challenges, etc. for general-purpose mobile ad hoc networks (MANET). In this paper, four laptops are used in an open field environment in four scenarios to evaluate the performances of Internet control message protocol (ICMP) based ping and transmission control protocol (TCP) based streaming video applications using optimised link state routing (OLSR) implementation in an IEEE 802.11g wireless network. Corresponding simulations are developed in Network Simulator ns-2 by setting simulation parameters according to the real experiments. Difficulties faced to regenerate real-life scenarios have been discussed and the gaps between reality and simulation are identified. A setup guideline to produce realistic simulation results has been established.  相似文献
4.
MANET节点移动模型仿真研究   总被引:4,自引:4,他引:0       下载免费PDF全文
移动自组网(MANET)节点移动特性对网络拓扑结构有重要影响,在合理的节点移动模型下对网络性能的评估才真实可靠。通过对网络仿真软件NS2进行拓展,实现个体、群体和具有地域限制的节点移动模型,提出物理链路和路由协议2个层面的评估准则,给出不同类节点模型对路由协议性能的影响程度。对研究和评估MANET的路由协议有重要的参考价值。  相似文献
5.
移动自组织网络上VoIP的实现方法研究   总被引:3,自引:0,他引:3  
提出了一种在移动自组织网络上实现VoIP应用的设计方案,能够有效地解决移动自组织网络上地址变更的问题,消除其对于语音通信的影响,保证节点之间可靠地进行通信.  相似文献
6.
移动自组网中节能路由策略的分析与比较   总被引:3,自引:0,他引:3  
移动自组网是由一组带有无线收发装置的移动节点组成的一个支持多跳的临时性的网络自治系统。由于移动自组网的大多数节点是由有限寿命的电池来提供的,因此能量保护策略成为制定路由协议的一个重要依据。通过对现有移动自组网的节能路由策略的分析和比较,提供了未来的研究方向。  相似文献
7.
移动Ad hoc网络的黑洞攻击研究*   总被引:3,自引:0,他引:3       下载免费PDF全文
移动Ad hoc网络(MANET)是一个极具实际应用价值的研究领域,由于其自身的开放媒质、动态拓扑、分布式协作和受限能力等特点,MANET极易受到攻击,其安全问题正受到越来越广泛的重视。路由在整个网络安全中扮演重要角色,首先综合论述一种路由攻击类型——黑洞问题的研究概况,然后剖析黑洞问题的基本定义、功能结构和工作原理,归纳总结目前防范黑洞问题的最新技术,最后给出针对黑洞问题研究的若干热点问题与展望。  相似文献
8.
MANET典型路由协议的性能分析与仿真   总被引:3,自引:2,他引:1       下载免费PDF全文
移动Ad Hoc网络(MANET)是由一组无线移动主机组成的一个没有任何事先建立好的基础设施或集中管理设备的临时网络,其特点是网络拓扑易变,带宽、能源有限及容易受到攻击等。该文对AODV, DSR, DSDV这几种典型的路由协议进行分析比较,指出它们的优缺点及适用场合。通过2个场景的配置,从路由开销、分组投递率、端到端的平均时延3个方面进行实验。仿真结果表明,按需路由协议在3个方面都表现出较好的性能。  相似文献
9.
Small World Model-Based Polylogarithmic Routing Using Mobile Nodes   总被引:3,自引:0,他引:3       下载免费PDF全文
The use of mobile nodes to improve network system performance has drawn considerable attention recently. The movement-assisted model considers mobility as a desirable feature,where routing is based on the store-carry-forward paradigm with random or controlled movement of resource rich mobile nodes.The application of such a model has been used in several emerging networks,including mobile ad hoc networks(MANETs),wireless sensor networks(WSNs),and delay tolerant networks(DTNs).It is well known that mobility increases the capacity of MANETs by reducing the number of relays for routing,prolonging the lifespan of WSNs by using mobile nodes in place of bottleneck static sensors,and ensuring network connectivity in DTNs using mobile nodes to connect different parts of a disconnected network.Trajectory planning and the coordination of mobile nodes are two important design issues aiming to optimize or balance several measures, including delay,average number of relays,and moving distance.In this paper,we propose a new controlled mobility model with an expected polylogarithmic number of relays to achieve a good balance among several contradictory goals,including delay,the number of relays,and moving distance.The model is based on the small-world model where each static node has"short"link connections to its nearest neighbors and"long"link connections to other nodes following a certain probability distribution.Short links are regular wireless connections whereas long links are implemented using mobile nodes.Various issues are considered,including trade-offs between delay and average number of relays,selection of the number of mobile nodes,and selection of the number of long links.The effectiveness of the proposed model is evaluated analytically as well as through simulation.  相似文献
10.
In Mobile Ad Hoc Networks (MANETs), nodes depend upon each other for routing and forwarding packets. However, nodes belonging to independent authorities in MANETs may behave selfishly and may not forward packets to save battery and other resources. To stimulate cooperation, nodes are rewarded for their forwarding service. Since nodes spend different cost to forward packets, it is desirable to reimburse nodes according to their cost so that nodes get incentive while the least total payment is charged to the sender. However, to maximize their utility, nodes may tell lie about their cost. This poses the requirement of truthful protocols, which maximizes the utility of nodes only when they declare their true cost. Anderegg and Eidenbenz recently proposed a truthful routing protocol, named ad hoc-VCG. This protocol incurs the route discovery overhead of O(n3), where n is the number of nodes in the network. This routing overhead is likely to become prohibitively large as the network size grows. Moreover, it leads to low network performance due to congestion and interference. We present a low-overhead truthful routing protocol for route discovery in MANETs with selfish nodes by applying mechanism design. The protocol, named LOTTO (Low Overhead Truthful rouTing prOtocol), finds a least cost path for data forwarding with a lower routing overhead of O(n2). We conduct an extensive simulation study to evaluate the performance of our protocol and compare it with ad hoc-VCG. Simulation results show that our protocol provides a much higher packet delivery ratio, generates much lower overhead and has much lower end-to-end delay.  相似文献
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