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共 3174 条记录，以下是2271-2280 订阅

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A multi-scale strategy in wireless sensor networks for structural health monitoring

A multi-scale strategy in wireless sensor networks for struc...

引用

2009 5th international conference on Intelligent sensors, sensor Networks and Information Processing, ISSNIP 2009

作者： Liu, Xuefeng Cao, Jiannong Xu, Youlin Wu, Hejun Liu, Yang Department of Computing Hong Kong Polytechnic University Hong Kong Hong Kong Department of Civil and Structural Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9781424435180

Wireless sensor network (WSN) has been considered to be the next generation paradigm of structural health monitoring (SHM) systems due to its low cost, high scalability and flexibility. However, some inherent limitations of WSN such as low-bandwidth wireless communication, limited resources on wireless sensor nodes, must be addressed to meet the generally high requirements of SHM. distributed in-network processing has been widely accepted as a solution to this problem. However, the drawbacks of existing distributed algorithms, such as the low sensitivity, the dependency on accurate structural model, the incapability of handling various environmental conditions, et al., greatly constrained their practical applications. In this paper, we propose a multi-scale strategy in WSNs for SHM applications. The approach, called the ACF-CCF, utilizes the autocorrelation function of individual sensor node to detect the existence of damage and the cross-correlation function of designated node pairs to obtain damage location. Through simulation and laboratory test, the effectiveness of the proposed approach is demonstrated. Compared with existing distributed SHM algorithms, the method is energy efficient, model free and is robust to various environmental conditions. © 2009 ieee.

关键词： Structural health monitoring

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A Multi-Rate Based Router Placement Scheme for Wireless Mesh Networks

A Multi-Rate Based Router Placement Scheme for Wireless Mesh...

引用

6th international conference on Mobile Adhoc and sensor systems

作者： Wang, Junfang Cai, Kan Agrawal, Dharma R. Univ Cincinnati Ctr Distributed & Mobile Computing Dept Comp Sci Cincinnati OH 45221 USA Univ British Columbia Dept Comp Sci Vancouver BC V6T1N4 Canada

ISBN: (纸本)9781424451142

Mesh router (MR) placement is one of the fundamental issues that need to be addressed carefully to achieve a desired performance of a wireless mesh network (WMN). The objective of the MR placement schemes is to systematically determine the minimal number of MRs and their positions while satisfying various constraints, such as coverage, connectivity, traffic demand, etc. This paper explores the solution for placing the MRs with multiple transmission rates, which influence both transmission range and wireless link capacity. In the paper, we first formulate the problem with a mixed integer programming model. We then present a heuristic placement algorithm called ILSearch which takes into account both multiple transmission rates and co-channel interference. The ILSearch consists of two components: (1) Coverage MR determination which greedily exploits the capability of each selected MR to cover mesh clients (MCs);and (2) Relay MR determination that incrementally chooses the additional MRs for traffic relaying through the local search. Our simulation has not only shown that ILSearch can effectively obtain the MR placement that meets all the constraints, but also demonstrated that a MR placement which considers the variable transmission rates outperforms those don't.

关键词： Integer programming

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PNet: A Grid Type sensor Network of Reconfigurable Nodes

PNet: A Grid Type Sensor Network of Reconfigurable Nodes

引用

international conference on distributed computing systems Workshop

作者： Varun Subramanian Alex Doboli Department of Electrical and Computer Engineering State University of New York Stony Brook Stony Brook NY USA

This paper discusses a grid-type sensor network with reconfigurable PSoCs as sensor nodes, and details the middleware routines that support the high-level model for distributed programming. The advantages of using reconfigurable PSoCs over other architectures, like MICA2 motes, are also discussed. The paper refers to a case study to illustrate the capabilities of the proposed network concept.

关键词： sensor systems Temperature sensors Middleware System-on-a-chip Temperature distribution Network servers Temperature measurement distributed computing conferences Computer architecture

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An Adapting Random Walk for Ad Hoc and sensor Networks

An Adapting Random Walk for Ad Hoc and Sensor Networks

引用

international conference on distributed computing systems Workshop

作者： Adnan Noor Mian Roberto Baldoni Roberto Beraldi DIS University of Roma La Sapienza Rome Italy

In this paper we propose an adaptive random walk for wireless networks. The lifetime of the walk is varied in such a way that at least a given fraction of nodes is covered, in expectation. The only parameter of the random walk, alpha, depends on the nominal network size N and on the required coverage. For sizes lower than N the required coverage is satisfied with lifetime slightly higher than the optimal one. The paper reports performance results obtained through analytical study backed up with simulations.

关键词： Wireless sensor networks Routing Temperature sensors distributed computing conferences sensor systems Performance analysis Analytical models Clustering algorithms Wireless networks

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Fast, Seamless Rekeying In Wireless sensor Networks

Fast, Seamless Rekeying In Wireless Sensor Networks

引用

international conference on distributed computing systems Workshop

作者： Subir Biswas Md Mahbubul Haque Saeed Rashwand Jelena Misic Department of Computer Science University of Manitoba Winnipeg MAN Canada

We extend the probabilistic key-based approach for wireless sensor networks concerning the slow rekeying and path key reestablishment processes. By introducing a novel, energy efficient, distributed, and faster scheme, we attempt to replace the existing ordinary rekeying method of probabilistic key management scheme through a deterministic algorithm that works on both the base station and on each communicating pair of sensor nodes. The node predetermines the backup link key for a future key revocation and switches to the backup key when needed without further interrupting the base station or the key server. This scheme assures high level of security in rekeying operation, and at the same time reduces the rekeying cost very significantly.

关键词： Wireless sensor networks Base stations Data security Communication system control distributed computing conferences Computer science Energy efficiency Energy management Switches

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Embedded sensor Networks 3rd

Embedded Sensor Networks

引用

3rd international conference on Information systems, Technology and Management, ICISTM 2009

作者： Iyengar, Sitharama S. Sensor Network Laboratory Dept. of Computer Science Louisiana State University United States

ISBN: (纸本)9783642004049

Embedded sensor networks are distributed systems for sensing and in situ processing of spatially and temporally dense data from resource-limited and harsh environments such as seismic zones, ecological contamination sites are battle fields. From an application point of view, many interesting questions arise from sensor network technology that go far beyond the networking/computing aspects of the embedded system. This talk presents an overview of various open problems that are both of mathematical and engineering interests. These problems include sensor-centric quality of routing/energy optimization among other graph theoretic problems. © Springer-Verlag Berlin Heidelberg 2009.

关键词： sensor networks

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On the Connected k-Coverage Problem in Heterogeneous sensor Nets: The Curse of Randomness and Heterogeneity

On the Connected k-Coverage Problem in Heterogeneous Sensor ...

引用

ieee international conference on distributed computing systems

作者： Habib M. Amman John Giudici Wireless Sensor and Mobile Ad-Hoc Networks (WiSeMAN) Research Lab Department of Computer Science Hofstra University Hempstead NY 11549 USA

ISBN: (纸本)9781424444816

Coverage is an essential task in sensor deployment for the design of wireless sensor networks. While most existing studies on coverage consider homogeneous sensors, the deployment of heterogeneous sensors represents more accurately the network design for real-world applications. In this paper, we focus on the problem of connected k-coverage in heterogeneous wireless sensor networks. Precisely, we distinguish two deployment strategies, where heterogeneous sensors are either randomly or pseudo-randomly distributed in afield. While the first deployment approach considers a single layer of heterogeneous sensors, the second one proposes a multi-tier architecture of heterogeneous sensors to better address the problems introduced by pure randomness and heterogeneity.

关键词： Random Number Generators sensors Wireless sensor networks Coverage Heterogeneous sensor placement multi-tier deployment Network design one layer

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Protecting Neighbor Discovery Against Node Compromises in sensor Networks

Protecting Neighbor Discovery Against Node Compromises in Se...

引用

ieee international conference on distributed computing systems

作者： Donggang Liu iSec Laboratory CSE Department The University of Texas at Arlington

ISBN: (纸本)9781424444816

The neighborhood information has been frequently used by protocols such as routing in sensor networks. Many methods have been proposed to protect such information in hostile environments. However, these methods can only protect neighbor relations between benign nodes. A compromised node can easily circumvent them and setup false neighbor relations with sensor nodes in many places, impacting the network at a large scale. This paper presents a theoretic model for neighbor discovery in sensor networks and describes a fundamental security limitation and a generic attack against this model. The paper then proposes an efficient and localized solution based on a security property achievable during sensor deployment. This technique provides a threshold security guarantee in dealing with compromised sensor nodes. The analytical and simulation studies show that the technique is practical and effective for sensor networks.

关键词： sensor networks Neighbor sensor placement Ganglia Network routing

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Formal Analysis of Fault Recovery in Self-Organizing systems

Formal Analysis of Fault Recovery in Self-Organizing Systems

引用

ieee international Symposium on Dependable, Autonomic and Secure computing (DASC)

作者： Jan Calta Miroslaw Malek Department of Computer Science Humboldt University of Berlin Berlin Germany

The members of a self-organizing distributed system have ability to automatically organize themselves into a specific structure. The functionality of the system is achieved by collaboration of the members in this structure. Through automatic (re)organization, such a system is able to recover from various temporary faults which may disturb the established structure. In this paper, we propose a technique to identify all recoverable faults as well as to analyze fault tolerance and recovery from temporary faults by reorganization in self-organizing systems.

关键词： Fault tolerant systems Information analysis distributed computing Collaboration Fault diagnosis Protocols State-space methods Biosensors sensor phenomena and characterization sensor systems

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A Straightforward Path Routing in Wireless Ad Hoc sensor Networks

A Straightforward Path Routing in Wireless Ad Hoc Sensor Net...

引用

international conference on distributed computing systems Workshop

作者： Zhen Jiang Junchao Ma Wei Lou Jie Wu Computer Science Department West Chester University West Chester PA USA Department of Computing Hong Kong Polytechnic University Hong Kong China Department of Computer Science & Engineering Florida Atlantic University Boca Raton FL USA

Building a ldquostraightforwardrdquo path in wireless ad hoc sensor networks (WASNs) not only avoids wasting energy in detours, but also incurs less interference in other transmissions when fewer nodes are involved in the transmission. This plays an important role in recent WASN applications that require a streaming service to deliver large amount of data. In this paper, we extend our early work on the straightforward path routing in WASNs in the presence of the ldquolocal minimardquo, where the routing is blocked due to the lack of available forwarding successors. We bring some new insights of the safety information model for a forwarding routing that is limited in the request zone. A new routing is proposed to make a more intelligent decision in greedy advance and achieve more straightforward paths. The experimental results show substantial improvements of our approach compared with the best result known to date.

关键词： Wireless sensor networks Routing distributed computing Interference Safety USA Councils Computer networks Intelligent sensors conferences sensor systems

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