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检索条件"任意字段=6th ACM Conference on Embedded Networked Sensor Systems"

共 1172 条记录，以下是71-80 订阅

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Wireless sensor network for substation monitoring: Design and deployment 08

Wireless sensor network for substation monitoring: Design an...

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6th acm conference on embedded networked sensor systems, SenSys 2008

作者： Nasipuri, Asis Cox, Robert Alasti, Hadi Van Der Zel, Luke Rodriguez, Bienvenido McKosky, Ralph Graziano, Joseph A. ECE Department Univ. of NC at Charlotte 9201 University City Blvd. Charlotte NC 28223 United States EPRI-Transmissions and Substations 9625 Research Drive Charlotte NC 28262 United States Research and Technology Applications 1101 Market Street Chattanooga TN 37402 United States

ISBN: (纸本)9781595939906

We present the design and performance of a wireless sensor network that is deployed in a substation for monitoring the health of power subsystems such as circuit breakers, transformers and transformer bushings. the sensor network consists of 45 low power nodes for temperature sensing and a high power node that is capable of performing more specialized computations. All nodes communicate over a multihop mesh network that uses a dynamic link-quality based routing protocol. the nodes are solar powered and are capable of operating autonomously for multiple years. © 2008 acm.

关键词： Low power electronics

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Dustminer: Troubleshooting Interactive Complexity Bugs in sensor Networks 08

Dustminer: Troubleshooting Interactive Complexity Bugs in Se...

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6th acm conference on embedded networked sensor systems

作者： Khan, Mohammad Maifi Hasan Le, Hieu Khac Ahmadi, Hossein Abdelzaher, Tarek F. Han, Jiawei Univ Illinois Dept Comp Sci Urbana IL 61801 USA

ISBN: (纸本)9781595939906

this paper presents a tool for uncovering bugs due to interactive complexity in networked sensing applications. Such bugs are not: localized to one component that is faulty, but rather result from complex and unexpected interactions between multiple often individually non-faulty components. Moreover, the manifestations of these bugs are often not repeatable, making them particularly hard to find, a's the particular sequence of events that invokes the bug may not be easy to reconstruct. Because of the distributed nature of failure scenarios, our tool looks for sequences of events that may be responsible for faulty behavior, as Opposed to localized bugs such as a bad pointer in a module. All extensible framework is developed where a front-end collects runtime data logs of the system being debugged and an offline back-end uses frequent discriminative pattern mining to uncover likely causes of failure. We provide a case study of debugging a recent multichannel MAC protocol that was found to exhibit corner cases of poor performance (worse than single channel MAC). the tool helped uncover event sequences that lead to a highly degraded mode of operation. Fixing the problem significantly improved the performance of the protocol. We also provide a detailed analysis of tool overhead in terms of memory requirements and impact oil the running application.

关键词： Protocol debugging Distributed automated debugging Wireless sensor networks

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Distributed Image Search in Camera sensor Networks 08

Distributed Image Search in Camera Sensor Networks

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6th acm conference on embedded networked sensor systems

作者： Yan, Tingxin Ganesan, Deepak Manmatha, R. Univ Massachusetts Dept Comp Sci Amherst MA 01003 USA

ISBN: (纸本)9781595939906

Recent advances in sensor networks permit the use of a large number of relatively inexpensive distributed computational nodes with camera sensors linked in a network and possibly linked to one or more central servers. We argue that the full potential of such a distributed system can be realized if it;is designed As a distributed search engine where images from different sensors can be captured, stored, searched and queried. However, unlike traditional image search engines that are focused on resource-rich situations, the resource limitations of camera sensor networks in terms of energy, bandwidth, computational power, and memory capacity present significant challenges. In this paper, we describe the design and implementation of a distributed search system over a, camera sensor network where each node is a search engine that senses, stores and searches information. Our work involves innovation at many levels including local storage, local search, and distributed search, all of which are designed to be efficient under the resource constraints of sensor networks. We present an implementation of the search engine on a network of iMote2 sensor nodes equipped with low-power cameras and extended flash storage. We evaluate out-system for a dataset comprising book images, and demonstrate more than two orders of magnitude reduction in the amount of data communicated and Lip to 5x reduction in overall energy consumption over alternate techniques.

关键词： camera sensor networks visterms vocabulary tree distributed search

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Robust Topology Control for Indoor Wireless sensor Networks 08

Robust Topology Control for Indoor Wireless Sensor Networks

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6th acm conference on embedded networked sensor systems

作者： Hackmann, Gregory Chipara, Octav Lu, Chenyang Washington Univ Dept Comp Sci & Engn St Louis MO 63130 USA

ISBN: (纸本)9781595939906

Topology control can reduce power consumption and channel contention in wireless sensor networks by adjusting the transmission power. However, topology control for wireless sensor networks faces significant challenges, especially in indoor environments where wireless characteristics are extremely complex and dynamic. We first provide insights on the design of robust topology control schemes based on an empirical study in an office building. For example, our analysis shows that Received Signal Strength Indicator and Link Quality Indicator are not always robust indicators of Packet Reception Rate in indoor environments due to significant multi-path effects. We then present Adaptive and Robust Topology control (ART), a novel and practical topology control algorithm with several salient features: (1) ART is robust in indoor environments as it does riot rely on simplifying assumptions about the wireless properties;(2) ART can adapt to variations in both link quality and contention;(3) ART introduces zero communication overhead for applications which already use acknowledgements. We have implemented ART as a topology layer in TinyOS 2.x. Our topology layer only adds 1.2 bytes of RAM per neighbor and 1.5 kilobytes of ROM, and requires minimal changes to upper-layer routing protocols. the advantages of ART have been demonstrated through empirical results on a 28-node indoor testbed.

关键词： Power Management Topology Control

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Resource Aware Programming in the Pixie OS 08

Resource Aware Programming in the Pixie OS

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6th acm conference on embedded networked sensor systems

作者： Lorincz, Konrad Chen, Bor-rong Waterman, Jason Werner-Allen, Geoff Welsh, Matt Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA

ISBN: (纸本)9781595939906

this paper presents Pixie, a new sensor node operating system designed to support the needs of data-intensive applications. these applications, which include high-resolution monitoring of acoustic, seismic, acceleration, and other signals, involve high data rates and extensive in-network processing. Given the fundamentally resource-limited nature of sensor networks, a pressing concern for such applications is their ability to receive feedback on, and adapt their behavior to, fluctuations in both resource availability and load. the Pixie OS is based on a dataflow programming model based on the concept of resource tickets, a core abstraction for representing resource availability and reservations. By giving the system visibility and fine-grained control over resource management, a broad range of policies can be implemented. To shield application programmers from the burden of managing these details, Pixie provides a suite of resource brokers, which mediate between low-level physical resources and higher-level application demands. Pixie is implemented in NesC and supports limited backwards compatibility with TinyOS. We describe Pixie in the context of two applications: limb motion analysis for patients undergoing treatment for motion disorders, and acoustic target detection using a network of microphones. We present a range of experiments demonstrating Pixie's ability to accurately account for resource availability at runtime and enable a range of both generic and application-specific adaptations.

关键词： Resource-Aware Programming Resource Reservations Wireless sensor Networks

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A Framework for Data Quality and Feedback in Participatory Sensing 07

A Framework for Data Quality and Feedback in Participatory S...

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5th acm conference on embedded networked sensor systems

作者： Reddy, Sasank Burke, Jeff Estrin, Deborah Hansen, Mark Srivastava, Mani Univ Calif Los Angeles Ctr Embedded Networked Sensing Los Angeles CA 90024 USA

ISBN: (纸本)9781595937636

the rapid adoption of mobile phones by society over the last decade and the increasing ability to capture, classifying, and transmit a wide variety of data (image, audio, and location) have enabled a new sensing paradigm - where humans carrying mobile phones can act as sensor systems. Human-in-the-loop sensor systems raise many new challenges in areas of sensor data quality assessment, mobility and sampling coordination, and user interaction procedures.

关键词： Mobile systems Human sensor Networks

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A Methodology for In-Network Evaluation of Integrated Logical-Statistical Models 08

A Methodology for In-Network Evaluation of Integrated Logica...

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6th acm conference on embedded networked sensor systems

作者： Singh, Anu Ramakrishnan, C. R. Ramakrishnan, I. V. Warren, David S. Wong, Jennifer L. SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)9781595939906

Synthesizing high-level semantic knowledge from low-level sensor data is an important problem in many sensor network applications. Programming a network to perform such synthesis in situ is especially difficult due to the stringent resource constraints, unreliable wireless communication, and complex distributed algorithms and network protocols required to manipulate the data. Recently, a declarative programming language called Snlog [5] has been developed to address this problem. However, statistical reasoning for modeling noise in the context of sensor networks has not been addressed in Snlog. In this paper, we develop a methodology based on the PRISM [361 framework, which integrates logical and statistical reasoning, for specifying sensor network programs that deal with noisy data and tolerate faults in the network. the relationship between high-level (synthesized) and low-level (observed) data is captured by logical rules, while statistical models are used to specify computations in the presence of noise and faults. We illustrate our methodology with three examples: (i) estimating temperature at various points in a region, (ii) evaluating the trajectory of an object observed by a sensor network, based on the Hidden Markov Model, and (iii) evaluating most reliable communication paths between sensor nodes. We analyze the results of simulations as well as an experimental deployment to evaluate the practical feasibility of our approach.

关键词： sensor networks In-network analysis Logical-Statistical models

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A Fault-Tolerant Node Scheduling Scheme to Extend the Lifetime of Wireless sensor Networks 07

A Fault-Tolerant Node Scheduling Scheme to Extend the Lifeti...

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5th acm conference on embedded networked sensor systems

作者： Pazand, Babak Datta, Amitava Cardell-Oliver, Rachel Univ Western Australia Crawley WA 6009 Australia

In this paper., we propose a fault-tolerant node scheduling scheme to solve the coverage problem in sensor networks.

ISBN: (纸本)9781595937636

In this paper., we propose a fault-tolerant node scheduling scheme to solve the coverage problem in sensor networks.

关键词： sensor Networks Node Scheduling

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Lance: Optimizing High-Resolution Signal Collection in Wireless sensor Networks 08

Lance: Optimizing High-Resolution Signal Collection in Wirel...

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6th acm conference on embedded networked sensor systems

作者： Werner-Allen, Geoffrey Dawnson-Haggerty, Stephen Welsh, Matt Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA

ISBN: (纸本)9781595939906

An emerging class of sensor networks focuses on reliable collection of high-resolution signals from across the network. In these applications, the system is capable of acquiring more data than can be delivered to the base station, due to severe limits on radio bandwidth and energy. Moreover, these systems are unable to take advantage of conventional approaches to in-network data aggregation, given the high data rates and need for raw signals. these systems face an important challenge: how to maximize the overall value of the collected data, subject to resource constraints. In this paper, we describe Lance, a general approach to bandwidth and energy management for reliable data collection in wireless sensor networks. Lance couples the use of optimized, data-driven reliable data collection with a model of energy cost for extracting data from the network. Lance's design decouples resource allocation mechanisms from application-specific policies, enabling flexible customization of the system's optimization metrics. We describe the Lance architecture in detail, demonstrating its use through a range of target applications and resource management policies. We present an extensive study driven by both real and synthetic data distributions, through simulations and runs on a large sensor testbed. We show that Lance maximizes the value of the collected data under a range of resource constraints, achieving near-optimal allocation of radio bandwidth and energy. Finally, we present results from a real sensor network deployment at Tungurahua volcano, Ecuador, in which Lance was used to drive data collection for an eight-node network collecting seismic and acoustic signals from the active volcano.

关键词： Wireless sensor Networks Data Collection Resource Management

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Demo Abstract: A Navigation System based on a sensor Network without Exit and Locations

Demo Abstract: A Navigation System based on a Sensor Network...

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7th acm conference on embedded networked sensor systems (SENSYS)

作者： Zhang, Kui Zhang, Qian Jiang, Tao Guo, Peng Hong Kong Univ Sci & Technol Hong Kong Hong Kong Peoples R China

In the paper, we design a navigation system based on sensor network to guide a robot to walk out of event region. the navigation system does not require any exit or locations.

ISBN: (纸本)9781605587486

In the paper, we design a navigation system based on sensor network to guide a robot to walk out of event region. the navigation system does not require any exit or locations.

关键词： Navigation Wireless sensor Networks Location-free

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