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Power-aware node deployment in wireless sensor networks

Power-aware node deployment in wireless sensor networks

引用

ieee international conference on sensor Networks, Ubiquitous, and Trustworthy computing

作者： Yunhuai Liu Hoilun Ngan L.M. Ni Department of Computer Science Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0769525539

sensor networks have attracted intensive interests due to its extendable capability. In this paper, we attempt to answer a fundamental but practical question: "how should we deploy these nodes?" In most current designs, sensors are randomly or uniformly distributed because of their simplicity. However, the node deployment has a great impact to the wireless systems. It in essential highlights an open issue that, instead of maintaining the coverage for some snapshots of the network, how we can provide a continuous coverage in the whole lifecycle of the wireless sensor networks. We will exhibit the weakness of the uniform distribution by disclosing the fatal sink routing-hole problem. To address this problem, we propose a non-uniform, power-aware distribution scheme. Our analysis and simulation results show that the power-aware deployment scheme can significantly improve the long-termed network connectivity and service quality

关键词： Intelligent networks Wireless sensor networks sensor phenomena and characterization Computer science Analytical models Wireless communication Monitoring Pollution Feature extraction Transceivers

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distributed Boundary Estimation using sensor Networks

Distributed Boundary Estimation using Sensor Networks

引用

ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Subhasri Duttagupta Krithi Ramamritham Parmesh Ramanathan Department of Computer Sc. and Engineering Indian Institute of Technology Mumbai India Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA

We examine the problem of determining boundaries occurring in natural phenomena using sensor networks. sensor nodes remotely collect data about various points on the boundary. From this data, we estimate the boundary along with the confidence intervals using a regression relationship among sensor locations and the distances to the boundary. The confidence intervals are guaranteed to be narrower than a specified maximum width. Our distributed boundary estimation strategy uses a hierarchical structure of clusters of sensor nodes and requires 20-50% less messages as compared to a centralized scheme. The computed intervals show desired coverage of the true boundary points. Further, motivated by the practical need to estimate the boundary with a minimum number of sensors, we develop an adaptive approach for turning sensors on and off. The number of ON sensors in this scheme is only about 15% more than what a practical Oracle needs, to evaluate the boundary and confidence intervals around it. Our algorithms are also evaluated using data from real sensors on a testbed

关键词： sensor phenomena and characterization Petroleum Remote sensing distributed computing Monitoring Oceans Space exploration Radar tracking Laser radar Computer networks

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Efficient localization in mobile wireless sensor networks

Efficient localization in mobile wireless sensor networks

引用

ieee international conference on sensor Networks, Ubiquitous, and Trustworthy computing

作者： Yi-Ling Hsieh Kuochen Wang Department of Computer Science National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)0769525539;97

The proposed DRL is a distributed range-free localization approach. In order to save communication cost in localization, DRL reduces information flooding among nodes by dynamically changing each seed's flooding-hop to limit seed flooding in a local area; however, it still maintains the whole coverage. In addition, DRL allows all the nodes mobile and moving freely, while there is only a limited fraction of nodes having self-positioning capability (called seeds). Moreover, DRL can adapt to low or high node density, because of its dynamic seed flooding and robust triangulation. Dynamic seed flooding is to change flooding coverage according to each seed's surrounding node density. Robust triangulation allows the cases of insufficiency of reference nodes. We have evaluated DRL and MCL. Simulation results have shown that the location accuracy of DRL is 26% higher than that of MCL. With mobile positioning, DRL is suitable for applications, such as navigation systems using e-map and community health-care systems, in outdoor environments

关键词： Intelligent networks Wireless sensor networks Floods Hardware Robustness Mobile communication Costs Computer science Councils Navigation

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Fast data access over asymmetric channels using fair and secure bandwidth sharing

Fast data access over asymmetric channels using fair and sec...

引用

international conference on distributed computing systems

作者： S. Agarwal M. Laifenfeld A. Trachtenberg M. Alanyali Deutsche Telekom Research and Development Laboratories Berlin Germany Boston University Boston MA USA

We propose a peer-to-peer architecture designed to overcome asymmetries in upload/download speeds that are typical in end-user dialup, broadband and cellular wireless Internet connections. Our approach allows users at remote locations to access information stored on their home computers at rates often exceeding their home connection’s upload capacity. The key to this approach is to share file data when communications are idle using random linear coding, so that, when needed, an end-user can download a file from several sources at a higher data rate than his home computer’s upload capacity. We prove that our proposed system is asymptotically fair, in that (even malicious) users are proportionally assigned idle bandwidth depending on how much bandwidth they contribute, and that there is a natural incentive to join and cooperate fairly in the system. In addition, our approach provides cryptographic security and geographic data robustness to the participating peers.

关键词： Bandwidth Home computing Data security Robustness Web and internet services Web server Radio spectrum management Wireless sensor networks Laboratories Peer to peer computing

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Communication Area Based Positioning

Communication Area Based Positioning

引用

ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Jurgo Preden Tallinn University of Technology Tallinn Estonia

This paper presents an algorithm for positioning sensor network nodes based on the communication areas of the nodes. The nodes can be positioned either using a small number of anchor nodes or a single location aware mobile node which can determine its location dynamically through external means (e.g. an existing infrastructure, such as GPS). The algorithm does not use any distance or bearing estimations between nodes, but instead the communication areas of anchor nodes are used to determine the position of nodes. The paper presents an overview of the algorithm explaining the main principles of the algorithm. A semi-formal description of the algorithm is given, followed by the description of the simulations. The simulations involved randomly and relatively sparsely distributed nodes in a square area with randomly and more sparsely distributed anchor nodes in the same area. In addition to simulations some tests in a test environment were conducted positioning MICA2 motes and RF ID tags by a mobile location aware platform. The test setup is described and the test results are presented. The paper is concluded by some finalizing remarks and ideas for further research

关键词： Hardware Testing Radio frequency Mobile communication Direction of arrival estimation Costs Pervasive computing Global Positioning System sensor systems sensor phenomena and characterization

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Characterization of a Connectivity Measure for Sparse Wireless Multi-hop Networks

Characterization of a Connectivity Measure for Sparse Wirele...

引用

international conference on distributed computing systems Workshop

作者： S. Perur S. Iyer KReSIT IIT Bombay Mumbai India

The extent to which a wireless multi-hop network is connected is usually measured by the probability that all the nodes form a single connected component. We jind this measure, called connectivity, unsuitable for use with sparse networks since it is not indicative of the actual communication capability of the network, and can be unresponsive to changes in network parameters. An alternate connectivity measure that wejnd useful in sparse networks is the fraction of node pairs in the network that are connected. We call this term reachability and claim that it is more intuitive and expressive than connectivity when dealing with sparse networks. We identify reachability as growing according to the logistic growth model and present a regression model for reachability in terms of number of nodes and normalized transmission range. This can be used by a network designer to estimate the tradeoff between how connected the network is, the number of nodes, the area of operation, and transmission range of nodes.

关键词： Spread spectrum communication Logistics Wireless communication Channel capacity Interference Wireless sensor networks Telecommunication traffic Communication networks Costs Wireless networks

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A ZMP sensor for a biped robot

A ZMP sensor for a biped robot

引用

ieee international conference on Robotics and Automation (ICRA)

作者： M. Shimojo T. Araki Aigou Ming M. Ishikawa Mechanical Engineering and Intelligent Systems University of Electro-Communications Chofu Japan Department of Information Physics and Computing Graduate School of Information Scienceand Technology University of Tokyo Bunkyo Tokyo Japan

A sensor attached to the sole of the foot of a biped robot to detect a zero moment point (ZMP) is proposed and basic experimental results are presented. The sensor simultaneously detects the center position of a two-dimensional distributed load on the surface of the sensor and the total load of the distribution. The sensor is sheet-like in form, lightweight (0.2 g/cm 2 ), offers a high-speed response (within 1 ms), and needs a little wiring (four wires). In the present paper, the principle of the above-described sensor and its characteristics are described, and the ZMP locus is shown for a walking biped robot with the attached sensors

关键词： Robot sensing systems Legged locomotion Force sensors Foot sensor phenomena and characterization Leg Intelligent sensors sensor arrays Intelligent robots Wiring

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Deterministic Data Reduction in sensor Networks

Deterministic Data Reduction in Sensor Networks

引用

ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Huseyin Akcan Herve Bronnimann Computer & Information Science Department Polytechnic University Brooklyn NY USA

The processing capabilities of wireless sensor nodes enable to aggregate redundant data to limit total data flow over the network. The main property of a good aggregation algorithm is to extract the most representative data by using minimum resources. From this point of view, sampling is a promising aggregation method, that acts as surrogate for the whole data, and once extracted can be used to answer multiple kinds of queries (such as AVG, MEDIAN, SUM, COUNT, etc.), at no extra cost. Additionally, sampling also preserves the correlation info within multi-dimensional data, which is quite valuable for further data mining. In this paper, we propose a novel, distributed, weighted sampling algorithm to sample sensor network data and compare to an existing random sampling algorithm, which to the best of our knowledge is the only algorithm to work in this kind of setting

关键词： Sampling methods Data mining Costs Wireless sensor networks Computer networks Aggregates Data flow computing Information science Context Network topology

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Signal Processing Challenges in distributed Stream Processing systems

Signal Processing Challenges in Distributed Stream Processin...

引用

international conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： P. Frossard O. Verscheure C. Venkatramani Ecole Polytechnique Fédérale de Lausanne EPFL Signal Processing Institute Lausanne Switzerland IBM Thomas J. Watson Research Center Yorktown Heights NY USA

distributed stream processing represents a novel computing paradigm where data, sensed externally and possibly preprocessed, is pushed asynchronously to various connected computing devices with heterogeneous capabilities for processing. It enables novel applications typically characterized by the need to process high-volume data streams in a timely and responsive fashion. Some example applications include sensor networks, location-tracking services, distributed speech recognition, and network management. Recent work in large-scale distributed stream processing tackle various research challenges in both the application domain as well as in the underlying system. The main focus of this paper is to highlight some of the signal processing challenges such a novel computing framework brings. We first briefly introduce the main concepts behind distributed stream processing. Then we define the notion of relevant information from two related information-theoretic approaches. Finally, we browse existing techniques for sensing and quantizing the information given the set of classification, detection and estimation tasks, which we refer to as task-driven signal processing. We also address some of the related unexplored research challenges

关键词： Signal processing Streaming media distributed computing Speech recognition Pipelines Information analysis Data mining distributed processing sensor phenomena and characterization Computer network management

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AFlexible Framework for Wireless-Based Intelligent sensor with Reconfigurability , Dynamic adding ,and Web interface

AFlexible Framework for Wireless-Based Intelligent Sensor wi...

引用

ACIS international conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/distributed computing (SNPD)

作者： Hung-Chieh Yu Shu-Ming Tseng Department of Electronic Engineering IBM X series Development Center National Taipei University of Technology Taiwan Department of Electronic Engineering National Taipei University of Technology Taiwan

In this paper, we propose the use of standard, verifiable, common approach platform called the flexible wireless sensor platform (FWSP) architecture which had following features remote Internet enabler, reconfiguration by parameter which improve precision, dynamic addition of sensor nodes, and fault tolerance which increase the reliability, stability. The goals of the FWSP architecture are to establish: common controller-hardware (system on module), a common control program, common device drivers, a common managed objects base, and a common appearance to higher-level sensor network management. The proposed platform architecture offers flexibility, easy customization ,and seamless system integration. An experiment has been established based on wireless communication channel, using wireless LAN (ieee802.11) as primary communication channel on our prototype sensor node, I2C/Smbus device such as temperature sensors, and desire sensor information can be viewed, and sensor parameter can be adjusted to meet demanding. Measurements about the development time, sensor reconfiguration and confirm the proposed framework feasibility and effectiveness

关键词： Intelligent sensors Temperature sensors sensor phenomena and characterization Communication system control Control systems Wireless sensor networks Internet Fault tolerance Stability sensor systems

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