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Lifetime and Buffer-Size Optimization for RF Powered Wireless Sensor Networks 射频供电无线传感器网络的寿命和缓冲区大小优化
B. Koirala, K. Dahal
Radio Frequency-Energy Harvesting (RF-EH) system usually incorporates ‘harvest-store-use’ mechanism, i.e. the harvested RF energy is first stored in an energy buffer and when the stored energy level is sufficient enough to power an application it is then supplied to the device. To improve the network’s performance in terms of lifetime and buffer capacity, it is crucial to develop a model for RF powered Wireless Sensor Networks (WSNs), which considers source-load relations, buffer size and ambient conditions within the context of Energy Neutral Operation (ENO) and minimum energy wastage. In this paper, we propose a model for RF powered WSNs that makes use of available RF energy with variations in maximum and minimum energy levels for two different worst case scenarios encompassing ENO and buffer requirements. We develop an algorithm based on the proposed model to find the optimum energy consumption rate of each sensor nodes that would ensure maximum lifetime of the WSN with minimum buffer capacity. We verified our approach by comparing the results with all other possible consumption rates. We also performed a comparative analysis to find the effect of available RF energy fluctuation in the individual sensor nodes’ lifetime.
射频能量收集(RF- eh)系统通常采用“收集-储存-使用”机制,即收集的射频能量首先存储在能量缓冲器中,当存储的能量水平足以为应用程序供电时,然后将其提供给设备。为了提高网络在寿命和缓冲容量方面的性能,在能量中立操作(ENO)和最小能量浪费的背景下,建立一个考虑源负载关系、缓冲大小和环境条件的射频供电无线传感器网络(WSNs)模型至关重要。在本文中,我们提出了一个射频供电wsn的模型,该模型利用最大和最小能级变化的可用射频能量来应对两种不同的最坏情况,包括ENO和缓冲需求。我们开发了一种基于所提出模型的算法,以找到每个传感器节点的最佳能量消耗率,从而保证WSN在最小缓冲容量下的最大寿命。我们通过将结果与所有其他可能的消耗率进行比较来验证我们的方法。我们还进行了比较分析,以发现可用射频能量波动对单个传感器节点寿命的影响。
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引用次数: 2
Internet of Entities (IoE): A Blockchain-based Distributed Paradigm for Data Exchange between Wireless-based Devices 实体互联网(IoE):基于区块链的分布式模式,用于无线设备之间的数据交换
Roberto Saia, S. Carta, D. R. Recupero, G. Fenu
The exponential growth of wireless-based solutions, such as those related to the mobile smart devices (e.g., smart-phones and tablets) and Internet of Things (IoT) devices, has lead to countless advantages in every area of our society. Such a scenario has transformed the world a few decades back, dominated by latency, into a new world based on an efficient real-time interaction paradigm. Recently, cryptocurrency has contributed to this technological revolution, whose fulcrum is a decentralization model and a certification function offered by the so-called blockchain infrastructure, which makes it possible to certify the financial transactions, anonymously. This paper aims to indicate a possible approach able to exploit this challenging scenario synergistically by introducing a novel blockchain-based distributed paradigm for data exchange between wireless-based devices defined Internet of Entities (IoE). It is based on two core elements with interchangeable roles, entities and trackers, which can be implemented by using existing infrastructures and devices, such as those related to smart-phones, tablets, and IoT systems. The employment of the blockchain-based distributed paradigm allows our approach ensuring the anonymization and immutability of the involved data, which is key in many scenarios and domains (e.g. financial applications, health and legal applications dealing with personal and sensitive data), requirements more and more searched in recent innovations. The possibility to exchange data among a huge number of devices gives rise to a novel and widely exploitable data environment, whose applications are possible in different domains, such as, in Security, eHealth, and Smart Cities.
基于无线的解决方案呈指数级增长,例如与移动智能设备(例如智能手机和平板电脑)和物联网(IoT)设备相关的解决方案,在我们社会的各个领域都带来了无数的优势。这样的场景已经将几十年前由延迟主导的世界转变为一个基于高效实时交互范式的新世界。最近,加密货币为这场技术革命做出了贡献,其支点是所谓的区块链基础设施提供的去中心化模型和认证功能,这使得匿名认证金融交易成为可能。本文旨在指出一种可能的方法,通过引入一种新的基于区块链的分布式范式,在基于无线的实体互联网(IoE)定义的设备之间进行数据交换,从而协同利用这种具有挑战性的场景。它基于两个核心元素,具有可互换的角色,实体和跟踪器,可以通过使用现有的基础设施和设备来实现,例如与智能手机,平板电脑和物联网系统相关的基础设施和设备。基于区块链的分布式范式的使用使我们的方法能够确保所涉及数据的匿名化和不可变性,这在许多场景和领域(例如,处理个人和敏感数据的金融应用程序、健康和法律应用程序)中是关键,这是最近创新中越来越多的需求。在大量设备之间交换数据的可能性产生了一种新颖且可广泛利用的数据环境,其应用可以应用于不同的领域,例如安全、电子健康和智能城市。
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引用次数: 23
A Comparative Performance Evaluation of Distributed Collision-free MAC Protocols for Underwater Sensor Networks 水下传感器网络分布式无碰撞MAC协议性能比较评价
F. Alfouzan, A. Shahrabi, S. Ghoreyshi, T. Boutaleb
The design of Medium Access Control (MAC) protocols for UWSNs poses many challenges because of their long propagation delay, high mobility, limited bandwidth, and high bit error rate. Due to these unique acoustic channel characteristics, most contention-based MAC protocols are costly. Thus, collisions and retransmissions should be efficiently handled at the MAC layer in order to reduce the energy cost and to improve throughput and fairness across the network. As a consequence, they do not perform as efficiently as their achieved performance in terrestrial networks. In this paper, we evaluate the performance of three recently reported distributed collision-free MAC protocols; namely, ED-MAC, DL-MAC, and GC-MAC under various operational conditions. An extensive simulation study is carried out to compare the performance of these MAC protocols in terms of packet delivery ratio (PDR), throughput, and energy consumption with different scenarios (narrow and shallow networks) under varying traffic rates and numbers of nodes. Our study results showed that ED-MAC reaches the best energy efficiency in a narrow scenario with a light load than DL-MAC and GC-MAC protocols. While DL-MAC is a suitable choice for both scenarios among others in terms of flexibility. In terms of reliability and scalability, GC-MAC achieves the best performance in both scenarios than other protocols.
uwsn的介质访问控制(MAC)协议由于其传输延迟长、移动性高、带宽有限、误码率高等特点,给其设计带来了诸多挑战。由于这些独特的声道特性,大多数基于争用的MAC协议都是昂贵的。因此,应该在MAC层有效地处理冲突和重传,以减少能量成本,提高整个网络的吞吐量和公平性。因此,它们的性能不如它们在地面网络中达到的性能那样有效。在本文中,我们评估了最近报道的三种分布式无冲突MAC协议的性能;即不同运行条件下的ED-MAC、DL-MAC和GC-MAC。本文进行了广泛的仿真研究,比较了这些MAC协议在不同流量速率和节点数下,在不同场景(窄网络和浅网络)下,在分组传输比(PDR)、吞吐量和能耗方面的性能。研究结果表明,与DL-MAC和GC-MAC协议相比,ED-MAC协议在负载较轻的窄场景下具有最佳的能效。而DL-MAC在灵活性方面是两种场景的合适选择。在可靠性和可扩展性方面,GC-MAC在这两种场景下的性能都是其他协议中最好的。
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引用次数: 12
Geolocalization in Smart Environment 智能环境中的地理定位
Joseph Merhej, J. Demerjian, Karla Fares, J. B. Abdo, A. Makhoul
Nowadays, wireless indoor positioning systems have become very familiar, and widespread all over the world. They are successfully used in many applications including tracking objects e.g. Firemen who usually face life-threatening situations. Indoor positioning systems become critically convenient in such scenarios. This paper deals with the tracking of a group of firemen during their mission in order to have a real-time visibility of their coordinates. These firemen are armed by smart sensors and are, at the same time, active in a smart environment containing referenced nodes. This paper will propose two approaches: ‘Centralized Emission’, and ‘Broadcast Emission’ and will describe the proposed method to calculate the firemen’s coordinates.
如今,无线室内定位系统已经变得非常熟悉,并在世界范围内广泛应用。它们成功地应用于许多应用,包括跟踪物体,例如经常面临生命危险的消防员。在这种情况下,室内定位系统变得非常方便。本文研究了一组消防员在执行任务期间的跟踪,以便实时查看他们的坐标。这些消防员配备了智能传感器,同时在包含参考节点的智能环境中活动。本文将提出两种方法:“集中发射”和“广播发射”,并将描述提出的方法来计算消防员的坐标。
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引用次数: 1
Efficient Cluster based Routing Protocol for Collaborative Body Sensor Networks 基于集群的高效协同身体传感器网络路由协议
Nadine Boudargham, J. B. Abdo, J. Demerjian, C. Guyeux, A. Makhoul
Collaborative Body Sensor Networks (CBSNs) are collection of Body Sensor Networks that move in a given area and collaborate, interact and exchange data between each other to identify group activity, perceive events detected by group of individuals, and monitor the status of single and multiple persons. Even though some routing algorithms were proposed for Wireless Sensor Networks (WSNs) and Body Sensor Networks (BSNs), very few studies were found to cover routing in CBSNs. In this paper, we propose a robust cluster based scheme that increases the routing efficiency through the three steps of the routing process: cluster formation, cluster head election, and routing operation of data to the Base Station (BS). MATLAB simulations are performed to compare the performance of the proposed algorithm to other existing routing schemes. Results show that the proposed scheme outperforms others in terms of delay, energy consumption, and packet drop percentage, and therefore succeeds in addressing CBSN challenges.
协作式身体传感器网络(CBSNs)是身体传感器网络的集合,它们在给定区域内移动,相互协作、交互和交换数据,以识别群体活动,感知由一组个体检测到的事件,并监测单个和多个人员的状态。尽管针对无线传感器网络(WSNs)和身体传感器网络(BSNs)提出了一些路由算法,但很少有研究发现涵盖了CBSNs中的路由。本文提出了一种鲁棒的基于集群的路由方案,该方案通过路由过程的三个步骤来提高路由效率:集群形成、簇头选举和数据到基站(BS)的路由操作。通过MATLAB仿真,比较了该算法与其他现有路由方案的性能。结果表明,该方案在延迟、能耗和丢包率方面优于其他方案,因此成功地解决了CBSN的挑战。
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引用次数: 2
A Stranded Unshielded Twisted Pair Modeling for Online Fault Location using OMTDR-based Diagnosis Sensor 基于omtdr诊断传感器在线故障定位的非屏蔽双绞线建模
W. B. Hassen, M. Kafal, E. Cabanillas
Despite the worldwide use of stranded Unshielded Twisted Pair (UTP) cables, scientific references dealing with accurate calculation of distributed parameters of such transmission lines are generally missing, especially in high frequency applications where skin and proximity effects are present. On the other hand, reflectometry is a high frequency method that relies on wave propagation in a cable under test for fault diagnosis. In this context, this paper proposes a distributed parameters model for the lossy transmission line of a stranded UTP cable including the pitch of twist and frequency dependent effects to evaluate as faithfully as possible the reflectometry response in such cables. The developed model is validated with 3D-electromagnetic simulations using Time Domain Reflectometry (TDR). For online diagnosis, Orthognal Multi-Tone Time Domain Reflectometry is performed thanks to its capacity to control bandwidth and enable sensors fusion. In complex wiring networks, the developed model is performed to evaluate the performance of OMTDR-based diagnosis sensor including a Xilinx Zynq 7010 FPGA, 10-bit Analog-to-Digital Converter (ADC) and Digital-to-Analog Converter (DAC).
尽管世界各地都在使用非屏蔽双绞线(UTP)电缆,但通常缺乏处理此类传输线分布参数精确计算的科学参考文献,特别是在存在蒙皮和接近效应的高频应用中。另一方面,反射法是一种依靠被测电缆中的波传播来进行故障诊断的高频方法。在这种情况下,本文提出了一种包含扭节和频率依赖效应的多股UTP电缆损耗传输线分布参数模型,以尽可能真实地评估这种电缆的反射响应。利用时域反射仪(TDR)对所建立的模型进行了三维电磁仿真验证。对于在线诊断,由于具有控制带宽和实现传感器融合的能力,可以使用正交多音时域反射法。在复杂的布线网络中,该模型用于评估基于omtdr的诊断传感器的性能,该传感器包括Xilinx Zynq 7010 FPGA, 10位模数转换器(ADC)和数模转换器(DAC)。
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引用次数: 1
The Impact of Diverse Execution Strategies on Incremental Code Updates for Wireless Sensor Networks 不同执行策略对无线传感器网络增量代码更新的影响
Kai Lehniger, S. Weidling
Wireless Sensor Networks (WSNs) may require code updates for a variety of reasons, such as fixing bugs, closing security holes or extending functionality. WSNs typically have limited resources available and wireless updates are costly in terms of energy and can lead to early battery failure. The idea of incremental code updates is to conserve energy by reusing the existing code image on the node and disseminating only a delta file that is generated by differencing algorithms, which can be used to reconstruct the new image. Beyond these differencing algorithms, there are other strategies to minimize the delta, e.g., reconstructing only the changed parts of the image. This paper points out possible implications of diverse execution strategies and gives suggestions. In addition to the usual delta size, the impact on the flash memory was considered. The presented results can be used to select a fitting strategy for a given use case.
由于各种原因,无线传感器网络(wsn)可能需要代码更新,例如修复错误、关闭安全漏洞或扩展功能。wsn的可用资源通常有限,而且无线更新在能源方面成本高昂,并且可能导致早期电池故障。增量代码更新的思想是通过重用节点上的现有代码映像并仅传播由差分算法生成的增量文件来节省能量,该增量文件可用于重建新映像。除了这些差分算法之外,还有其他最小化delta的策略,例如,只重建图像的变化部分。本文指出了不同的执行策略可能带来的影响,并提出了建议。除了通常的增量大小外,还考虑了对闪存的影响。所呈现的结果可用于为给定用例选择合适的策略。
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引用次数: 3
Classification of Human Activities Indoors using Microclimate Sensors and Semiconductor Gas Sensors 利用微气候传感器和半导体气体传感器对室内人类活动进行分类
M. Maciejewska, A. Szczurek, A. Dołęga
Nowadays, one of important problems faced by people in developed countries is poor indoor air quality (IAQ). Factors, which influence air inside buildings should be recognised for planning actions aimed at the improvement of indoor conditions. Our study was focused on human impact on IAQ. The aim of this work was the classification of the occurrence of occupants activities, which influence IAQ. The classification was based on measurements of indoor air using sensors. The presented analysis was focussed on the kind of sensors that are capable of providing the information which is most relevant for classification. Two groups of such devices were considered. The first included sensors which are typically used in microclimate measurements, i.e. temperature, relative humidity and CO2 concentration sensor. The second group included semiconductor gas sensors, which are considered as the sources of information about the chemical quality of indoor air. Classification tree was applied as the classifier. The obtained results showed that the measurement data provided by both groups of sensors can be applied for the classification of human activities, with the satisfactory performance. It may be understood that the impact of human activities on indoor air is very broad and may be examined using versatile sources of measurement data.
如今,在发达国家,人们面临的一个重要问题是室内空气质量差。影响建筑物内空气的因素应在规划旨在改善室内条件的行动时予以确认。我们的研究重点是人类对室内空气质量的影响。这项工作的目的是对影响室内空气质量的居住者活动的发生进行分类。分类是基于使用传感器对室内空气的测量。所提出的分析主要集中在能够提供与分类最相关的信息的传感器上。考虑了两组这样的装置。第一种包括通常用于小气候测量的传感器,即温度、相对湿度和二氧化碳浓度传感器。第二组包括半导体气体传感器,它们被认为是室内空气化学质量信息的来源。采用分类树作为分类器。结果表明,两组传感器提供的测量数据均可用于人体活动的分类,并具有满意的性能。可以理解的是,人类活动对室内空气的影响非常广泛,可以使用多种测量数据来源进行检查。
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引用次数: 1
Detection of Honeybee Disease: Varrosis using a Semiconductor Gas Sensor Array 检测蜜蜂疾病:使用半导体气体传感器阵列的静脉曲张
A. Szczurek, M. Maciejewska, B. Bak, Jakub Wilk, J. Wilde, M. Siuda
The presented study was focussed on the detection of Varroa destructor infestation of honeybee colonies, based on gas sensor measurements of beehive air. The detection consisted in determination whether the colony infestation rate was 0% or different. An array of partially selective gas sensors was used in measurements. It included the following semiconductor gas sensors: TGS832, TGS2602, TGS823, TGS826, TGS2603 and TGS2600. The sensors were exposed in dynamic conditions. The infestation detection problem was solved using a classification approach. The basis for classification were feature vectors. They were composed of responses of sensors, elements of the gas sensor array. The utilised responses were associated with various parts of the sensor signal recorded during dynamic exposure and regeneration. As a reference, we used the V. destructor infestation rate of bee colonies estimated using a flotation method. The smallest misclassification error was 17% and it was achieved with the k-NN classifier. The experimental study was performed in field conditions. It included honeybee colonies of various kinds, settled in beehives made of various materials, differently located, examined in various atmospheric conditions, at different times of the day. Taking this into consideration, the detection error at the level of 17 % is a promising result. It demonstrates the possibility to detect varroosis using an array of partially selective sensors.
本文主要研究了基于气体传感器测量蜂巢空气的蜂群瓦螨入侵检测方法。检测主要包括确定菌落侵染率是否为0%或不同。在测量中使用了一组部分选择性气体传感器。它包括以下半导体气体传感器:TGS832, TGS2602, TGS823, TGS826, TGS2603和TGS2600。传感器在动态条件下暴露。采用分类方法解决了虫害检测问题。分类的基础是特征向量。它们由传感器的响应组成,是气体传感器阵列的元件。所利用的响应与动态暴露和再生期间记录的传感器信号的各个部分相关联。作为参考,我们用漂浮法估算了蜂群的毁灭性毁灭性害虫侵害率。最小的误分类误差为17%,使用k-NN分类器可以实现。试验研究是在野外条件下进行的。它包括各种各样的蜂群,安置在不同材料制成的蜂箱里,在不同的位置,在不同的大气条件下,在一天的不同时间进行检查。考虑到这一点,在17%的水平上的检测误差是一个有希望的结果。它证明了使用部分选择性传感器阵列检测静脉曲张的可能性。
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引用次数: 7
City of the Future: Urban Monitoring based on Smart Sensors and Open Technologies 未来城市:基于智能传感器和开放技术的城市监控
Robert Schima, M. Paschen, P. Dietrich, J. Bumberger, Tobias Goblirsch
Developments in the field of microelectronics and the increasing willingness to use open technologies offer a variety of opportunities to significantly increase both understanding and public participation in the sustainable design of our cities and living spaces. Urban environmental monitoring on the basis of smart sensors and open technologies with the participation of citizens and local actors not only allows a better understanding of urban transformation processes but also increases the acceptance and resilience of a sustainable urban development towards the city of the future. What will the cities of the future look like? What is certain is that the future of cities will become more digital, with sensors, apps and citizens networking. So, how can smart sensors and open technologies help us better understand our environment? What do we need to know about our environment and the city we live in? Based on the developments of recent years, it is now a matter of course to book tickets for buses and trains with your smart phone or to look for the best restaurant. But what if citizens and local actors want to play an active role in urban development or monitoring?
微电子领域的发展和使用开放技术的意愿日益增强,为显著提高对城市和生活空间可持续设计的理解和公众参与提供了各种机会。基于智能传感器和开放技术的城市环境监测,在市民和地方行动者的参与下,不仅可以更好地了解城市转型过程,还可以提高对未来城市可持续发展的接受度和复原力。未来的城市会是什么样子?可以肯定的是,未来的城市将变得更加数字化,有传感器、应用程序和市民联网。那么,智能传感器和开放技术如何帮助我们更好地了解我们的环境呢?关于我们的环境和我们居住的城市,我们需要知道些什么?根据近年来的发展,现在用智能手机预订公共汽车和火车车票或寻找最好的餐馆是理所当然的事情。但是,如果市民和地方行动者希望在城市发展或监督中发挥积极作用呢?
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引用次数: 0
期刊
... International Conference on Wearable and Implantable Body Sensor Networks. International Conference on Wearable and Implantable Body Sensor Networks
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