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1.
基于动态数据压缩的能量采集无线传感网络数据收集优化   总被引:1,自引:0,他引:1  
谢小军  于浩  陶磊  张信明 《计算机应用》2018,38(8):2353-2358
针对能量采集无线传感网络(WSN)中的数据收集优化问题,考虑传感器节点能量采集的时空变化特性,提出一种基于节点动态采样速率和数据压缩的策略,以实现网络中采样数据总量的最大化。首先,提出一种根据节点的邻居信息决定其最优压缩策略的本地压缩算法,基于节点在数据汇聚树中的拓扑位置考虑其数据接收和转发能耗,逐渐增加其采样速率直到其总能耗到达采集能耗阈值。接着构造网络性能的全局优化问题并提出一种启发式的算法,通过迭代求解线性规划问题计算最优的采样速率和压缩策略。实验结果表明,与现有的自适应传感和压缩率选择方案相比,所提出的两种数据收集优化算法能够维持更加稳定的传感器节点电量水平并实现更高的网络性能。  相似文献   

2.
谢小军  于浩  陶磊  张信明 《计算机应用》2017,37(6):1545-1549
针对可充电无线传感网络中的能量均衡路由问题,提出在稳定功率无线充电和监测数据收集网络场景下的多路径路由算法和机会路由算法,以实现网络的能量均衡。首先,通过电磁传播理论构建了无线传感节点的充电和接收功率关系模型;然后,考虑网络中无线传感节点的发送能耗和接收能耗,基于上述充电模型将网络能量均衡的路由问题转化为网络节点运行时间的最大最小化问题,通过线性规划得到的各链路流量用以指导路由中数据流量分配;最后,考虑一种更加现实的低功耗的场景,并提出了一种基于机会路由的能量均衡路由算法。实验结果表明,与最短路径路由(SPR)和期望周期最短路由(EDC)算法相比较,所提出的两种路由算法均能有效提高采集能量的利用率和工作周期内的网络生命周期。  相似文献   

3.
孙永辉  秦晨  王义  艾蔓桐 《控制与决策》2018,33(7):1239-1246
针对传统电池供电系统能量有限问题,提出一种大范围无线可充电传感器网络(WRSNs)的数据路由和无线充电算法.以无线感知识别平台为基础,利用等边三角形的强覆盖性,并综合考虑网络路由协议和无线充电器特性对节点能量的影响,提出一种基于六边形路径的动态无线充电算法(IJRC_HP).算法包括两部分:依据充电器特性设计数据路由方法,使得能量接收功率高的节点承担更多的通信任务;依据该路由的特点设计充电方案,为能耗速度快的节点分配更多的充电时间.与等边三角形算法(TRIANGLE)、GRID算法进行仿真对比,实验结果表明,IJRC_HP算法在网络寿命提升、能量均衡、充电器移动效率和节点平均充电延时等方面具有优越性.  相似文献   

4.
能量问题一直是无线传感器网络研究的热点。传感器有限的电池电量会造成能量供应不足,甚至会导致网络瘫痪。同时传感器的移动性也给实现移动传感器网络的高效能量补充带来了新的挑战。为了保证移动传感器网络持续高效运行,本文提出了一种基于相遇位置预测的移动传感器网络能量补充方法。首先根据移动传感器的剩余能量和移动信息,计算移动充电装置与每一个提出充电请求传感器的最短相遇时间及相遇位置。其次在保证缺电传感器都能够获得公平的充电响应的基础上,移动充电装置优先选择与其相遇时间最短的缺电传感器进行能量补充。仿真实验结果表明本文提出的移动传感器网络能量补充方法能更有效地缩短充电延迟,提高充电效率。  相似文献   

5.
本文将SWIPT技术应用到无线充电传感器网络中,提出了一种基于SWIPT的协作传输协议(简称CTS),利用无线信息和能量的协作传输来提高无线能量传输的效率。在此基础上,设计了一个以最大化网络效用为目的的资源分配策略优化问题,并提出RAPOA算法来求解问题。仿真实验表明CTS最大化了网络效用,提高了无线充电传感器网络的能量传输效率。  相似文献   

6.
韩雨涝  房鼎益 《计算机应用》2020,40(6):1745-1750
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。  相似文献   

7.
可充电无线传感器网络是一种新型的无线传感网,它利用移动充电车在收集数据的同时给能量低的节点充电,可广泛应用于需要长期监测环境的应用中。但是,移动充电车如何在给定的延迟内完成数据收集,降低网络能耗并尽可能多地给低能量节点补充能量是一个具有挑战性的问题。因此提出一个新的算法RSEP(Root Selection with Energy Prediction)。首先,限定充电车的路径长度以保证延迟。然后,将路径上的低能量节点作为根节点,构造多棵数据收集树。若根节点能量可以保证其短期内不会死亡,则从树中寻找一条等于树的直径的路径。在该路径上选取网络中邻居最多的节点作为新的根节点,以改变树的结构来降低树高。树上的节点将它们的数据及能量信息沿着树传送到根节点。最后,移动充电车沿着充电路径为各个根节点充电时,就可以收集各个树上节点的数据及能量信息。此外,充电车收集到的能量信息会随着时间推移而“过时”,而能量信息是根节点选择时的重要参考因素。因此,充电车利用马尔科夫模型预测节点在下一轮数据收集开始时的能量,从而优化根节点的选择。仿真实验结果表明,与目前已有的算法相比,RSEP算法可以以较少的网络总能耗完成充电,并且每轮充电时间均较短。  相似文献   

8.
能量受限的单移动设备无线充电调度算法   总被引:1,自引:0,他引:1  
基于磁耦合谐振的多节点充电技术为解决无线传感网络的健壮性问题提供了潜在的解决方法。为了减少充电设备的移动能耗,保证充电规划的可调度性,结合磁耦合谐振的充电效率,采用蜂窝网状结构将网络分割成若干充电区域,提出了基于移动充电设备的无线传感器网络充电调度算法。由于实际的移动设备能量通常有限,在每个充电周期内综合考虑移动设备能量、节点剩余能量等,提出了自适应动态算法以自动选择k个充电区域。规划充电路径时,采用实时性较好的弹性网络算法来满足网络节点的充电需求。仿真结果表明,充电设备能量的大小会直接影响网络的总能量与最小剩余能量,算法在设备能量有限时能够最大化网络的最小能量,延长网络的生命周期。  相似文献   

9.
基于能量水平的多Sink节点传感器网络路由算法   总被引:4,自引:0,他引:4  
单Sink节点传感器网络存在着部分关键路径上节点能量消耗过快、路由选择算法单一以及Sink节点失效等问题.首先提出了多Sink节点传感器网络数据收集的系统框架;给出了拓扑发现和维护策略;然后提出了基于最小能量消耗路由算法.在分析了该算法的不足后提出了基于能量水平的路由算法,按照计算得到的能量水平选择最优的路径进行数据传送.实验证明,基于能量水平的路由算法比基于最小能量消耗路由算法能更有效提高传感器网络的使用寿命.  相似文献   

10.
在无线可充电传感器网络(wireless rechargeable sensor network,简称WRSN)中,所面临的一项重要挑战是如何在高效收集传感器节点数据的同时,降低网络整体能量消耗.大多数现有数据收集策略或是不能适应大规模的充电传感器网络,或是没有充分考虑到传感器节点能量补充的问题,这将严重降低网络的通信量和生命周期.为此,针对WRSN中数据收集和网络能耗的问题,提出使用数据收集小车(data collection vehicle,简称DCV)和无线充电小车(wireless charging vehicle,简称WCV)分别负责数据收集和节点充电,从而在优化数据收集的同时,保证网络的持续性.首先,为了提高数据收集和充电效率,根据传感器节点的邻域相似度以及节点之间的距离,将网络自适应划分为多个子区域;随后,根据传感器节点k跳路由之内的电池能量和节点社交性,选择各个区域内数据收集锚点;接着,通过分析传感器节点自身能量消耗与网络系统能耗之间的关系,设计了网络能耗优化函数,通过对偶分解和次梯度的方法求得优化函数的最佳节点感知率和物理链路传输率;最后,实验验证了该网络不仅能有效降低网络整体能耗,而且具有较低的节点死亡数目.  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.
《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   

18.
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   

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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