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1.
基于移动代理的无线传感器网络路由算法   总被引:1,自引:0,他引:1  
针对移动代理(MA)以能量有效的方式收集相关性数据的特点,提出了基于免疫算法的层次型改进路由算法,将移动代理和无线传感器网络中的分簇理论相结合.算法首先应用免疫算法对网络内的节点进行优化分簇,簇首选择时充分考虑节点的剩余能量等因素,在获得高效的分簇信息之后,为了避免所有的簇头都与基站进行远距离通信消耗过多的能量,在次应用免疫算法得到一条遍历所有簇首节点的最优路径提供给移动代理,以达到数据的有效收集和能量高效利用的目的.实验结果表明,提出的改进算法能够有效增加网络的传输次数,延长无线传感器网络的生存周期.  相似文献   

2.
一种基于能量均衡的无线传感器网络协议   总被引:1,自引:0,他引:1  
无线传感器网络协议LEACH中提到了分簇的思想,能够有效的减少节点在通信中的能量消耗,延长网络的生存时间.为了更有效的减少节点的能量消耗,延长网络的生存时间,可以在分簇的算法中采用能量均衡的思想,同时簇头收集数据后通过一棵路由树向汇聚节点发送数据.实验表明采用基于能量均衡的分簇算法的无线传感器有更好的整体性能和网络生存时间.  相似文献   

3.
高斯分布无线传感器网络簇头选择算法   总被引:1,自引:0,他引:1       下载免费PDF全文
针对无线传感器网络的能量受限问题,通常采用分簇聚合减少数据传输来实现能量节省。提出了一种基于高斯分布的分簇网络模型的簇头选择算法,构建了簇头选择函数的概率模型。模型以信道增益、剩余能量、簇内节点间距离及节点位置为参数,通过比较节点的概率函数值选择簇头。结果表明该选择算法能较大程度地提高网络能耗效率、延长网络生存时间。  相似文献   

4.
基于LEACH协议的助理簇头分簇算法   总被引:2,自引:0,他引:2       下载免费PDF全文
基于LEACH协议,提出助理簇头分簇算法。该算法能在无线传感器网络中根据簇头节点所处的地理位置、剩余能量及簇内成员节点数目,动态决定是否需要在簇内产生助理簇头,并在需要产生助理簇头的簇内选择合适的节点,从而减少簇头通信能耗,同时解决某些簇头与基站的通信问题。仿真结果表明,该算法能有效降低网络能耗、延长网络生存时间。  相似文献   

5.
异构传感器网络的分布式能量有效成簇算法   总被引:55,自引:3,他引:55  
卿利  朱清新  王明文 《软件学报》2006,17(3):481-489
为了延长网络的生存时间,需要设计能量有效的协议,以适应传感器网络的特点.成簇算法是传感器网络中减少能量消耗的一种关键技术,它能够增强网络的扩展性和延长网络的生存时间.研究了异构传感器网络中成簇算法在节省能量方面的性能,提出一种适应异构无线传感器网络的分布式能量有效的成簇方案.此方案基于节点剩余能量与网络节点的平均能量的比例来选举簇头节点.较高初始能量和剩余能量的节点比低能量节点拥有更多的机会成为簇头节点,从而使网络能量均匀消耗,延长网络的生存时间.模拟实验结果显示,与现有的重要成簇方案相比,新的成簇算法在异构网络下提供了更长的网络生存时间和更大的网络有效吞吐量.  相似文献   

6.
对无线传感器网络而言,网络生存时间是衡量网络性能的关键指标。为延长传感器网络寿命,提高能量使用效率,提出一种基于质心的LEACH改进型算法。利用在网络中加入一定量的信标节点并结合改进的Euclidean定位算法确定网络中各节点的相对位置,网络在LEACH算法分簇并确定一个簇头(副簇头)的基础上,基于簇内节点的相对位置在质心区域内选举另一个簇头(主簇头)。主簇头负责收集数据,并把融合后的数据发送给副簇头,由副簇头将数据转发给其它簇或基站。仿真结果表明,该算法有效均衡了网络负载,延长了网络生存时间。  相似文献   

7.
移动自组织网络具有自组织、动态拓扑、多跳通信和分布式控制等特点,可应用于小型区域战场和灾后现场的通信。然而通常由于节点能源受限,网络生存时间短暂,最大化利用现有资源是研究自组织网络的重要方向。自适应分簇算法是根据监测区域和节点位置划分网格,通过比较不同簇数下LBF值,得到最合理的分簇结构,进而以剩余能量等级最高的节点作为簇头。通过对100个节点时指定簇头、轮换簇头和自适应分簇三种算法下的网络节点生存时间和每轮节点的能量方差进行仿真,得出自适应分簇算法将网络生存时间明显延长,并平衡了簇头的负载。  相似文献   

8.
在无线传感器网络中,成簇算法是减少能量消耗的一种关键技术,它能够增强网络的扩展性和延长网络生存时间.本文提出了一种基于EAD 协议的无线传感器网络高效成簇算法(EC-EAD)。 EC-EAD算法在确立簇头节点时,将节点能量,节点之间距离与轮回次数综合加权,决定节点发送延迟。剩余能量高且距离较远的节点成为簇头节点,降低了网络内的簇头数目,也保证了网络能量的均匀消耗,延长了网络的生存时间。模拟实验结果表明,EC-EAD 算法在延长网络生存期方面比EAD 具有一定的优越性。  相似文献   

9.
一种能量高效的无线传感器网络分簇路由算法   总被引:2,自引:0,他引:2  
无线传感器网络中节点的能量有限,提高能量的有效性便成为无线传感器网络路由协议设计的首要目标。设计了一种能量高效的分簇路由算法,它提出让候选节点在一定的覆盖范围内以剩余能量为标准来竞选簇头,以使簇头分布均匀;处于簇类交界的节点则根据能量和距离来选择归属的簇头,以平衡网络负载;新算法还采用多跳的簇间通信方式来降低大部分簇头节点的通信负载。仿真结果表明:新算法能够有效降低网络能耗,延长网络生存时间。  相似文献   

10.
分簇路由协议对用于环境监测的无线传感器网络具有较好的节能性,数据压缩可以减少节点通信的数据量,但增加了分簇层次结构簇头的能耗和汇聚节点算法的复杂度,而由高能力节点担任簇头可以实现能量均衡并改善网络性能。针对无线传感器网络能量异构普遍存在的特点,提出了一种基于压缩感知的能量异构分簇路由协议(CSCH算法)。该算法根据异构节点能量确定多极簇头选举的概率,将簇内节点的信息集中在簇头上,而簇头对所采集的数据进行稀疏、压缩,以减少向汇聚节点传输数据的节点数和通信量,汇聚节点利用重构算法可从来自簇头的少量数据中恢复出信号源。同时设计了一种基于正态分布的权值系数,以优化在数据量过少情况下压缩感知算法的信号重构性能。仿真实验结果表明,该协议不仅能充分利用能量异构资源,均衡网络能耗,延长整个网络生命周期,而且能精确恢复信号源。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

18.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

19.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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