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无线传感器网中基于时隙轮循的串音控制策略   总被引:1,自引:0,他引:1  
提出了一种基于时隙轮循的无线传感器网络MAC协议串音控制策略。此策略以簇结构组织网络,由簇头为簇内节点分配互不重叠的工作时隙,并以自带信令的方式来避免节点之间可能的串音。理论分析及仿真表明采用时隙轮循的串音控制策略有效地减少了节点间的串音,提高了无线传感器网络MAC协议的能量有效性。  相似文献
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无线传感器网络中基于协同压缩方法的MAC协议   总被引:1,自引:0,他引:1       下载免费PDF全文
基于无线信号的广播本质,利用传统MAC协议所忽略的串音(overhearing)数据,提出一种方法以在媒介访问控制层去除数据的空间相关性.根据串音所接收到的数据,事件监测节点间协同地对自身的数据进行压缩后再发送,从而在链路层减少冗余信息的传输.首先针对节点间的协同数据压缩问题进行量化,建立线性规划模型;进而提出一种近似最优的、更低时间复杂度(O(N2))的启发式节点筛选算法.在此基础上,设计一种能量有效的、基于协同压缩方法的MAC协议(CCP-MAC),可分布式地控制节点实现该节点筛选算法,相应节点可从筛选出的被压缩节点子集中接收串音数据,融合冗余数据以后再进行发送.实验结果表明,CCP-MAC利用串音数据协调节点进行数据压缩,可在很大程度上节约能量,延长网络的生命周期.  相似文献
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Voice loops, an auditory groupware technology, are essential coordination support tools for experienced practitioners in domains such as air traffic management, aircraft carrier operations and space shuttle mission control. They support synchronous communication on multiple channels among groups of people who are spatially distributed. In this paper, we suggest reasons for why the voice loop system is a successful medium for supporting coordination in space shuttle mission control based on over 130 hours of direct observation. Voice loops allow practitioners to listen in on relevant communications without disrupting their own activities or the activities of others. In addition, the voice loop system is structured around the mission control organization, and therefore directly supports the demands of the domain. By understanding how voice loops meet the particular demands of the mission control environment, insight can be gained for the design of groupware tools to support cooperative activity in other event-driven domains.  相似文献
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移动Ad Hoc网拓扑结构经常变化。自适应后备路由局部修复AODV协议AODV-ABL通过监听RREP包和数据包来产生后备路由,并存于后备路由表中。仅当链路错误时,AODV-ABL才试图利用后备路由表进行局部修复。为提高对网络拓扑变化的自适应性,在AODV-ABL基础上,提出了一种快速自适应后备AODV路由协议AODV-FABL。AODV-FABL合并主路由表和后备路由表,在监听包时同步更新路由,路由能尽快地得到优化。实验结果表明,AODV-FABL取得了比AODV-LR、AODV-ABL更好的包投递率、端对端时延、控制开销和对流量负载变化的适应性。  相似文献
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摘 要 针对无线传感器网络中存在数据冲突和串音而影响MAC协议能量效率的问题,提出了基于接收和基于发送的TDMA-MAC协议时隙分配策略。通过考虑各种无线收发器模式(即发送、接收、休眠和空闲)花费的不同时间段来计算WSN能耗,假设聚类中WN数据包时间间隔为指数分布,采用两级TDMA方法实现对多步聚类的评估。利用OPNET Modeler软件执行仿真实验验证了本文模型的有效性,仿真结果表明,基于接收的SAS的能效是基于发送的SAS的5倍,相比基于分簇的TDMA/CDMA混合HCT-MAC协议,本文协议可节省4.3%的能量,减少了0.35ms的端到端延迟,相比倍增超周期多信道MAC协议,可节省10.8%的能量,减少了1ms的端到端延迟。  相似文献
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针对基于议价博弈的概率路由算法存在消息传送成功率提升偏慢、开销大、节点无序情况下竞争信道引起碰撞以及节点在多邻居状态下存在冗余交互的问题,提出一种基于旁听的机会网络路由算法—ORON。ORON算法通过旁听邻居节点信息,设计博弈策略使激励相容,节点对邻居与自身的交易状态进行分析,选择最佳策略,使得网络性能得到提升。仿真验证了ORON算法设计的有效性,结果表明:与基于议价博弈的现有路由算法GSCP相比,ORON算法的吞吐量和消息传送成功率至少提高了6.72%,而控制开销和平均端到端消息时延则分别降低了20%和3.55%以上。  相似文献
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Agent's flexibility and autonomy, as well as their capacity to coordinate and cooperate, are some of the features which make multiagent systems useful to work in dynamic and distributed environments. These key features are directly related to the way in which agents communicate and perceive each other, as well as their environment and surrounding conditions. Traditionally, this has been accomplished by means of message exchange or by using blackboard systems. These traditional methods have the advantages of being easy to implement and well supported by multiagent platforms; however, their main disadvantage is that the amount of social knowledge in the system directly depends on every agent actively informing of what it is doing, thinking, perceiving, etc. There are domains, for example those where social knowledge depends on highly distributed pieces of data provided by many different agents, in which such traditional methods can produce a great deal of overhead, hence reducing the scalability, efficiency and flexibility of the multiagent system. This work proposes the use of event tracing in multiagent systems, as an indirect interaction and coordination mechanism to improve the amount and quality of the information that agents can perceive from both their physical and social environment, in order to fulfill their goals more efficiently. In order to do so, this work presents an abstract model of a tracing system and an architectural design of such model, which can be incorporated to a typical multiagent platform.  相似文献
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移动自组织网的网络寿命很大程度上依赖于节点电池的有效利用,设计能量有效的算法来延长网络寿命成为其核心的问题。分析了MAC层的能量消耗,模型包括了节点的发送、接收、空闲和睡眠等状态,分析了冲突引起的重传以及节点偷听导致的能量消耗。最后给出了移动自组织网减少能量消耗的策略。  相似文献
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