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检索条件"任意字段=9th IEEE International Conference on Distributed Computing in Sensor Systems, DCoSS 2013"

共 236 条记录，以下是61-70 订阅

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Cooperative Modulation Diversity Applied to Heterogeneous Wireless sensor Networks

Cooperative Modulation Diversity Applied to Heterogeneous Wi...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Sousa, Marcelo Portela Araujo Lopes, Waslon Terllizzie Madeiro, Francisco Alencar, Marcelo S. Fed Inst Paraiba IFPB Campina Grande PB Brazil Inst Adv Studies Commun Iecom Campina Grande PB Brazil Fed Univ Campina Grande UFCG Campina Grande PB Brazil Univ Pernambuco Polytech Sch Pernambuco Recife PE Brazil

ISBN: (纸本)9781479946181

the technology of Wireless sensor Networks (WSNs) has been applied to automatic monitoring systems, and used in a wide variety of environments. In this paper, the authors evaluate the performance of a cooperative technique, applied to heterogeneous WSNs. the main contribution is the analysis of the impacts between the energy factor, the channel Signal-to-Noise Ratio (SNR) and the packet loss rate. the analysis also considers the energy consumption aspect. the cooperative modulation diversity performance is evaluated for different propagation scenarios and for two values of interleaving depth (K). A large value for K, leads the network to present lower values of packet lost rate. Some limiting conditions are obtained and the retransmission algorithm is discussed.

关键词： Wireless sensor networks energy factor signal to noise ratios Potassium automatic monitoring

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Efficient Agile Sink Selection in Wireless sensor Networks based on Compressed Sensing

Efficient Agile Sink Selection in Wireless Sensor Networks b...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Mahmudimanesh, Mohammadreza Naseri, Amir Suri, Neeraj Tech Univ Darmstadt Darmstadt Germany

ISBN: (纸本)9781479946181

Collection of the sensed data in a wireless sensor network at one or more sink(s) is a well studied problem and there are a lot of efficient solutions for a variety of wireless sensor network configurations and application requirements. these methods are often optimized towards collection of the sensed data at a predetermined base station or sink. this inherently reduces the agility of the wireless sensor network as the flow of information is not easily changeable after the establishment of the routing and data collection algorithms. this paper presents an efficient data dissemination method based on the compressed sensing theory that allows each sensor node to take the role of a sink. Agile sink selection is especially advantageous in scenarios where the sink or the end user of the wireless sensor network is mobile. the proposed method allows availing the global state of the environment by fetching a small set of data from any arbitrary node. Our evaluations prove the better performance of our technique over existing methods. Also a comparison with an oracle-based approach gives sufficient experimental evidences of a nearly optimal performance of our method.

关键词： Wireless sensor networks Sinks Compressed sensing state of the environment Dataset End users information flow agility optimum performance

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sensor Localization Via Diversely Polarized Antennas

Sensor Localization Via Diversely Polarized Antennas

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Marques Marinho, Marco Antonio de Freitas, Edison Pignaton Carvalho Lustosa da Costa, Joao Paulo de Sousa Junior, Rafael Timoteo Univ Brasilia UnB Dept Elect Engn ENE Brasilia DF Brazil Fed Univ Santa Maria Frederico Westphalen UFSM FW Dept Informat Technol Santa Maria RS Brazil

ISBN: (纸本)9781479946181

Wireless sensor networks (WSNs) are currently employed in a vast number of different applications ranging from home automation and health care to military systems. Although their application may vary greatly, WSNs share a common set of characteristics such as a limited energy supply and simple hardware. A common issue related with the application of WSNs is sensor localization, for some types of applications it is important that the sensors know the relative or absolute position of other sensors in the network, such as surveillance of monitoring networks. If sensors are randomly placed they may resort a wide range of methods such as Global Navigation Satellite systems (GNSS) or received signal strength indicators (RSSI). In this work we present an alternative to relative sensor localization by employed a crossed dipole antenna in the reception and a known polarization in the transmission. the accuracy of the proposed methods is measured trough numerical simulations and results are presented.

关键词： Wireless sensor Networks sensor Localization

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Energy Efficient Handover in HetNets Using ieee 802.21

Energy Efficient Handover in HetNets Using IEEE 802.21

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Coskun, Gurkan Hokelek, Ibrahim Cirpan, Hakan Ali Istanbul Tech Univ TR-80626 Istanbul Turkey

Along with the widespread usage of mobile devices supporting multiple radio interfaces, users can connect to the mobile operator9;s network using different access technologies such as UMTS, WLAN and WiMAX/LTE. Depe... 详细信息

ISBN: (纸本)9781479946181

Along with the widespread usage of mobile devices supporting multiple radio interfaces, users can connect to the mobile operator's network using different access technologies such as UMTS, WLAN and WiMAX/LTE. Depending on the network conditions and the QoS requirements of users, the usage of the right technology at the right time can provide more effective networking with higher data rate, lower cost, longer battery duration, and higher coverage area. To enable this networking effectiveness, a seamless handover mechanism to minimize service disruption is required. ieee 802.21, which defines a set of standards for media independent handover, is capable of realizing both horizontal and vertical handovers. In this paper, a new algorithm is proposed to provide energy efficient handovers among UMTS, WiMAX, and WLAN networks. the proposed algorithm is implemented within the ieee 802.21 framework and its performance analysis is performed using the ns-2.29 simulator. Simulation results show that the proposed algorithm significantly increases the service duration and hence decreases packet losses by dynamically changing the video downloading rate according to handover decisions and the remaining battery power levels.

关键词： HetNets 802.21 handover energy efficiency

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On Properties of Quantized Consensus in Layered sensor Networks

On Properties of Quantized Consensus in Layered Sensor Netwo...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Sheth, Vardhman Wan, Yan Xie, Junfei Fu, Shengli Lin, Zongli Das, Sajal K. Univ N Texas Dept Elect Engn Denton TX 76203 USA Univ Virginia Dept Elect & Comp Engn Charlottesville VA 22904 USA Missouri Univ Sci & Technol Dept Comp Sci Rolla MO 65409 USA

ISBN: (纸本)9781479946181

In this paper, we study properties of distributed consensus in layered sensor networks of the multi-layer multi-group (MLMG) structure. We show that properly designed MLMG networks maintain decentralized communication, whereas show the advantage of centralized structures. In particular, they require less number of transmissions required to reach consensus. this feature is critical for efficient distributed computing in large-scale sensor network applications. For typical classes of MLMG networks, we mathematically characterize the reduced number of transmissions compared to equivalent egalitarian decentralized structures of the same consensus dynamics. this explicit characterization based on simple graphical characteristics of MLMG structures permits an efficient design of large-scale network structures to meet desired performance requirements. In addition, we characterize the asymptotic and transient properties of consensus in MLMG networks of limited channel rates, using the probabilistic quantization schemes.

关键词： distributed Con

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Decentralizing and Adding Portability to an IoT Test-bed through Smartphones

Decentralizing and Adding Portability to an IoT Test-bed thr...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Nikoletseas, Sotiris Rapti, Maria Raptis, theofanis P. Veroutis, Konstantinos Univ Patras Dept Comp Engn & Informat GR-26110 Patras Greece Comp Technol Inst & Press Diophantus CTI Patras Greece

ISBN: (纸本)9781479946181

In this work, we develop an IPv6 enabled smart building test-bed facility, by combining sensing and communication devices and functionalities. We address the Internet of things paradigm by using diverse heterogeneous devices such as smartphones, sensor motes, NFC technology and traditional electrical devices, each one serving a specific role in the test-bed facility. Also, we extend a basic actuation component by making it self-aware, in terms of supported resources. those enhancements allow us to enrich the test-bed's capabilities in terms of M2M communication, portability and decentralization of the actuation process. Finally, we provide a simple smart room scenario for a tunable combination of energy efficiency and comfort, which automatically adjusts the room's light level based on ambient conditions and user preferences and demonstrate the feasibility of our system.

关键词： Deployment Emerging wireless technologies Smartphones Test-beds Wireless sensor Networks Smartphone deployment Wireless sensor networks Portability communication equipment User preferences IPv6 decentralization

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Modelling and Performance Analysis of Wireless sensor Networks Using Process Mining Techniques: ContikiMAC use case

Modelling and Performance Analysis of Wireless Sensor Networ...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Despaux, Francois Song, Ye-Qiong Lahmadi, Abdelkader Univ Lorraine LORIA F-54500 Vandoeuvre Les Nancy France

ISBN: (纸本)9781479946181

In the current protocol stack for Internet of things in general and wireless sensor network in particular, many devices rely on the ContikiMAC protocol at their MAC layer. this protocol is widely used and enabled by default for several industrial environments and time sensitive monitoring and control applications. However, few work exists regarding the performance of this protocol because it lacks of an underlying theoretical model for analysing its performance. In this paper, we propose a novel approach relying on process mining technique that aims to obtain a Markov chain model for networks running the ContikiMAC protocol. In particular, we present a comprehensive specification of the protocol and a Markov chain model obtained through the analysis and instrumentation of its reference implementation. We used the obtained Markov chain to analyze and estimate the end to end delay distribution for a multi-hops transmission with static routing. the approach can also be extended to a wide range of protocols.

关键词： MAC Protocols Markov chain Process Mining Network performance

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distributed Algorithm to Improve Coverage for Mobile Swarms of sensors

Distributed Algorithm to Improve Coverage for Mobile Swarms ...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Loscri, Valeria Natalizio, Enrico Razafindralambo, Tahiry Mitton, Nathalie Univ Calabria DEIS I-87036 Cosenza Italy

ISBN: (纸本)9780769550411

In this paper we focus on the problem of dynamic event coverage. We assume that no knowledge about either event position or duration is given a priori. Nonetheless, the events need to be monitored and covered thanks to mobile wireless sensors. thus, mobile sensors have to discover the events and move towards a new Zone of Interest (ZoI) when the previous monitored event is over. An efficient, distributed and localized solution of this problem would be immediately exploitable by several applications domains, such as environmental, civil, etc. We propose two novel approaches to deal with dynamic event coverage. the first one is a modified version of the PSO, where particles (mobile sensors, nodes or devices in the following) update their velocity by using only local information coming from their neighbors. In practice, the velocity update is performed by considering neighbors' sensed events. Our distributed version of PSO is integrated with a distributed version of the Virtual Force Algorithm (VFA). Virtual Force approach has the ability to "position" nodes with no overlap, by using attractive and repulsive forces based on the distance between nodes. the other proposed algorithm is a distributed implementation of the VFA by itself. Both techniques are able to reach high levels of coverage and show a satisfying reactivity when the ZoI changes. this output parameter is measured as the capability for the sensors to "follow" a sequence of events happening in different ZoIs. the effectiveness of our techniques is shown through a series of simulations and comparisons with the classical centralized VFA.

关键词： Wireless sensors Networks Particle Swarm Optimization Virtual Forces Zone of Interest Swarm Intelligence

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Indoor occupant positioning system using active RFID deployment and particle filters

Indoor occupant positioning system using active RFID deploym...

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Weekly, Kevin Zou, Han Xie, Lihua Jia, Qing-Shan Bayen, Alexandre M. Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA Nanyang Technol Univ Sch Elect & Elect Engn Ctr E City EXQUISITUS Singapore Singapore Tsinghua Univ Dept Automat TNLIST Ctr Intelligent & Networked Syst Beijing Peoples R China

ISBN: (纸本)9781479946181

this article describes a method for indoor positioning of human-carried active Radio Frequency Identification (RFID) tags based on the Sampling Importance Resampling (SIR) particle filtering algorithm. To use particle filtering methods, it is necessary to furnish statistical state transition and observation distributions. the state transition distribution is obstacle-aware and sampled from a precomputed accessibility map. the observation distribution is empirically determined by ground truth RSS measurements while moving the RFID tags along a known trajectory. From this data, we generate estimates of the sensor measurement distributions, grouped by distance, between the tag and sensor. A grid of 24 sensors is deployed in an office environment, measuring Received Signal Strength (RSS) from the tags, and a multithreaded program is written to implement the method. We discuss the accuracy of the method using a verification data set collected during a field-operational test.

关键词： indoor positioning particle filters wireless sensor networks

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Feature Extraction in Densely Sensed Environments

Feature Extraction in Densely Sensed Environments

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9th ieee international conference on distributed computing in sensor systems (dcoss)

作者： Vahabi, Maryam Gupta, Vikram Albano, Michele Tovar, Eduardo Polytech Inst Porto ISEP CISTER INESC TEC Oporto Portugal Carnegie Mellon Univ Elect & Comp Engn Pittsburgh PA 15213 USA

ISBN: (纸本)9781479946181

With the reduction in size and cost of sensor nodes, dense sensor networks are becoming more popular in a wide-range of applications. Many such applications with dense deployments are geared towards finding various patterns or features such as peaks, boundaries and shapes in the spread of sensed physical quantities over an area. However, collecting all the data from individual sensor nodes can be impractical both in terms of timing requirements and the overall resource consumption. Hence, it is imperative to devise distributed information processing techniques that can help in identifying such features with a high accuracy and within certain time constraints. In this paper, we exploit the prioritized channel-access mechanism of dominance-based Medium Access Control (MAC) protocols to efficiently obtain exterma of the sensed quantities. We show how by the use of simple transforms that sensor nodes employ on local data it is also possible to efficiently extract certain features such as local extrema and boundaries of events. Using these transformations, we show through extensive evaluations that our proposed technique is fast and efficient at retrieving only sensor data point with the most constructive information, independent of the number of sensor nodes in the network.

关键词： Feature extraction Time constraints Ganglia network node sensors Resource utilization sensor Data Boundary value problems Grain boundaries boundary layer

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