传感器网络分布式数据流的频繁项集挖掘算法

研究无线传感器网络中数据流频繁项集挖掘问题。针对集中式的静态数据流频繁项集挖掘方法不能在传感器网络中直接使用这一特点,提出基于传感器网络的分布式数据流的频繁项集挖掘算法FIMVS。该算法基于FPtree快速挖掘出传感器节点上单一数据流的局部频繁项集,然后通过路由将其在无线传感器网络里逐层上传合并,在Sink节点上汇聚后,采用自顶向下的高效剪枝策略挖掘出全局频繁项集。实验结果表明,该算法能有效地大幅度减少候选项集,降低无线传感器网络中的通信量,并有较高的时间和空间效率。     

无线传感器网络移动簇头节能传输协议

无线传感器网络具有资源的有限性和传感器采集数据的特点,许多在传统网络中运作良好的通信协议,在一些由固定节点和移动节点组成的无线传感器网络中不能很好地管理网络和处理传感器数据。该文提出一种移动簇头的节能通信协议,使用自组织传感器簇来处理和散发数据。通过与LEACH协议的对比,证明该协议具有更好的节能性和更长的网络寿命,更适用于无线传感器网络。     

移动Ad Hoc网络路由协议的性能分析与比较

移动Ad Hoe网络是由一组无线移动主机组成的一个没有任何建立好的基础设施或集中管理设备的临时网络.网络拓扑易变、带宽、能源有限是移动Ad Hoe网络的主要特点.分析表驱动路由协议DSDV和按需路由协议DSR、AODV和TO-RA,并利用NS2软件进行了仿真实验,通过改变节点的暂停时间和移动速度这两个参数来比较这两个参数对这四种协议性能的影响.仿真结果表明,按需路由协议在分组投递率、端到端的平均时延、路由开销方面都表现出较好的性能.但同时结合表驱动路由协议的特点,为进一步在综合考虑以上两类路由协议特点的基础上研究新的路由协议提供很好的参考.     

Multimedia resource allocation strategy of wireless sensor networks using distributed heuristic algorithm in cloud computing environment

The virtualized resource allocation (mapping) algorithm is the core issue of network virtualization technology. Universal and excellent resource allocation algorithms not only provide efficient and reliable network resources sharing for systems and users, but also simplify the complexity of resource scheduling and management, improve the utilization of basic resources, balance network load and optimize network performance. Based on the application of wireless sensor network, this paper proposes a wireless sensor network architecture based on cloud computing. The WSN hardware resources are mapped into resources in cloud computing through virtualization technology, and the resource allocation strategy of the network architecture is proposed. The experiment evaluates the performance of the resource allocation strategy. The proposed heuristic algorithm is a distributed algorithm. The complexity of centralized algorithms is high, distributed algorithms can handle problems in parallel, and reduce the time required to get a good solution with limited traffic.

     

基于SNMP的IPv6无线传感器网络信息管理平台的设计与实现

无线传感器网络(Wireless sensor networks)是随机分布的传感器节点通过分布式协议自组织方式形成的网络,网络管理是保障无线传感器网络稳定、可靠、高效运行的重要条件。讨论研究了现有无线传感器网络管理技术,并结合无线传感器网络的特点和实际需求,在已有IPv6无线传感器网络底层协议及SNMP(简单网络管理协议)的基础上,设计和实现了一个切实可行的符合无线传感器网络特点的节点信息管理平台,以实现用户对无线传感器网络的远程有效管理。     

综合覆盖调度的无线传感器网络跨层路由研究

无线传感器网络由大量微小的传感器节点构成,各节点协作完成环境现象的分布式感知。覆盖控制作为无线传感器网络中的一个基本问题,反映了网络所能提供的"感知"服务质量。基于现有的集中式计算覆盖集合算法MLMC,通过改变计算覆盖集合条件,结合能量不均衡消耗的I-RDDD协议,观察了网络生存期的变化。仿真结果和分析表明,基于能量考虑和单组覆盖集合轮询的工作方式能获得更长的网络生存期。     

一种安全的无线传感器节点结构设计方案

提出了一种提高无线传感器网络中传感节点安全性的系统结构,通过在传感节点上增加安全存储模块,可靠地保证了传感节点中所存储密钥信息的机密性、完整性,并可有效地对节点上关键应用程序的合法性进行验证,从而保证了传感网络中安全协议、认证方案的有效性、鲁棒性。和传统的传感节点相比,只是增加了节点的少量成本,但传感节点以及传感网络的安全性能得到了大幅度的提升。     

Power control based topology construction for the distributed wireless sensor networks

Wireless sensor network consists of large number of sensor nodes with limited battery power, which are randomly deployed over certain area for several applications. Due to limited energy resource of sensors, each of them should minimize the energy consumption to prolong the network lifetime. In this paper, a distributed algorithm for the multi-hop wireless sensor network is proposed to construct a novel energy efficient tree topology, without having location information of the nodes. Energy conservation of the nodes is accomplished by controlling transmission power of the nodes. Besides, maintenance of the network topology due to energy scarcity of the gateway nodes is also proposed in the protocol. Simulation results show that our distributed protocol can achieve energy conservation up to an optimum level similar to the centralized algorithm that we have considered and can extend the network lifetime as compared to other distributed algorithms without any power control.     

Performance evaluation of wireless sensor network protocols for industrial applications

Recently, distributed wireless microsensor systems have provided more flexible leverage to emerging industrial applications. The tiny distributed wireless microsensor network systems, however, should be designed to overcome various constraints such as limited energy, bandwidth limit, and unexpected failure of communication under disturbances. In addition, their network topologies need to be managed with designated communication protocols. Thus, design of microsensor network protocols still needs to be application-specific. It should be also evaluated through designated tools at each level of networking characteristics. This research describes essential factors that affect the performance of sensor network systems in the design of wireless microsensor network protocols, and presents effective time-based network protocol and performance evaluation tool which are applicable for various protocols in industrial applications. The developed network evaluation tool, called TIE/MEMS, also includes functional comparison with recent protocols proposed for wireless microsensor networks, and provides design guidelines for multi-sensor network systems needed for emerging industrial applications.     

联合无线充电与数据收集的移动充电装置多目标路径规划算法

针对无线传感器网络节点资源有限导致数据收集不完整和时效性差的问题，建立了联合无线充电和数据收集的移动充电装置（MCD）多目标路径规划模型，提出了一种基于贪心策略的联合无线充电和数据收集的MCD路径规划算法(PPGS)。首先，对监测区域采用基于正六边形的无缝划分策略，有效减少了MCD的访问单元数；然后，利用马尔可夫模型预测节点能量和数据采集量等参数，在此基础上预估了MCD锚点最小停留时间和最长等待时间。与现有时延受限移动式能量补充算法(DCMEC)和基于网格的移动装置调度算法(GBA+MDSA)相比，所提算法具有复杂度较低，且无需事先知道节点和锚点实际位置信息的优势。仿真结果表明：PPGS能以较少的MCD保证无线传感器网络数据收集的完整性和时效性。     

主动分布式无线网络计费框架

由于未来无线网络的带宽低,移动性强,服务配置复杂等特点,原有的集中式的单一计费模式已不能满足网络资源供需双方需要。为此,我们提出了一个基于主动网络和M obile IP等技术的主动分布式无线网络计费框架用于未来的网络计费。该文详细描述了整体结构,各部功能及工作流程,并在一个无线局域网中进行了原型实验,结果证明本系统实用,高效,分布和可扩展。     

无线传感网络中使用动态代理的节点收敛算法

This paper proposes fault tolerant algorithms for routing mobile agents in a single channel wireless sensor network which cover every node in the network. These algorithms use local knowledge (assume no knowledge of global deployment or topology, etc). We propose the algorithms and show mathematical analysis to support our claims. The paper ends with simulation studies and discussion of results.     

Energy-efficient multipath routing in wireless sensor network considering wireless interference

Due to the energy and resource constraints of a wireless sensor node in a wireless sensor network (WSN), design of energy-efficient multipath routing protocols is a crucial concern for WSN applications. To provide high-quality monitoring information, many WSN applications require high-rate data transmission. Multipath routing protocols are often used to increase the network transmission rate and throughput. Although large-scale WSN can be supported by high bandwidth backbone network, the WSN remains the bottleneck due to resource constraints of wireless sensors and the effects of wireless interference. In this paper, we propose a multipath energy-efficient routing protocol for WSN that considers wireless interference. In the proposed routing protocol, nodes in the interference zone of the discovered path are marked and not allowed to take part in the subsequent routing process. In this way, the quality of wireless communication is improved because the effects of wireless interference can be reduced as much as possible. The network load is distributed on multiple paths instead of concentrating on only one path, and node energy cost is more balanced for the entire wireless network. The routing protocol is simulated in NS2 software. Simulation result shows that the proposed routing protocol achieves lower energy cost and longer network lifetime than that in the literature.     

A comparative study on simulation vs. real time deployment in wireless sensor networks

Increasing deployment density and shrinking size of wireless sensor nodes requires small equipped battery size. This means emerging wireless sensor nodes must compete for efficient energy utilization. Medium Access Control (MAC) protocols play a vital role in energy consumption of sensor node as it controls the radio activities. Customized or open source simulators play an important role to measure the performance effectiveness of MAC protocols based on the fact that they are flexible, reduce experimental overhead and cost. Nevertheless, these benefits come at the cost of results accuracy. In this paper, we investigate differences of the behaviour of our agent based S-MAC protocols in real deployment compared to the results produced using our custom based simulator, which ignores the lower layers effects such as packet collision and overhearing. We use network simulator 2 (ns2), an open source simulator, which provides a complete protocol stack. We further try to find and explain the rationale of the variance of results produced by real deployment and that of simulators.     

无线传感器网络中一种分布式安全存储方案

对无线传感器网络的数据存储进行分析和研究,提出了一种以数据为中心的无线传感器网络中的分布式数据存储方案.该方案可有效解决集中式数据存储方案造成的中心节点的高负荷瓶颈问题,同时也避免了由于中心节点失效导致的数据丢失或泄漏问题.相对于现有的分布式数据存储方案,该方案运用Reed Solomon Code对数据进行加密,并且...     

Sensor selection for parameterized random field estimation in wireless sensor networks

We consider the random field estimation problem with parametric trend in wireless sensor networks where the field can be described by unknown parameters to be estimated. Due to the limited resources, the network selects only a subset of the sensors to perform the estimation task with a desired performance under the D-optimal criterion. We propose a greedy sampling scheme to select the sensor nodes according to the information gain of the sensors. A distributed algorithm is also developed by consensus-based ...     

无线传感器网络分布式多目标跟踪算法研究

由于无线传感器网络的资源有限,集中式多目标跟踪算法在无线传感器网络多目标跟踪中受到限制.在无线声学传感器网络下,基于动态分簇结构,提出了一种分布式多目标跟踪算法.每个传感器的测量为来自单个目标或多个目标的声音信号和环境噪声的叠加.在跟踪过程中,每个目标对应于一个粒子滤波,当目标之间的距离较远时,进行单目标跟踪.当目标之...     

层次拓扑结构的无线传感器网络能量模型

能耗效率是无线传感器网络中非常重要的性能指标。为了提高网络能耗效率,研究无线传感器网络中的能量模型是非常必要的。针对无线传感器网络层次拓扑结构模型,根据传感器节点工作能耗特点和在网络中承担的不同角色,推导出普通传感器节点、簇头节点能耗模型;并对单跳和多跳两种传输方式的网络能耗以及能耗最小时的最优簇头数进行理论分析和计算,对比了不同传输方式的网络能耗。通过理论分析推导出网络能耗和最优簇头数公式,将为设计能量有效的无线传感器网络拓扑结构算法和通信协议提供指导和理论基础。