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检索条件"任意字段=6th IEEE International Conference on Distributed Computing in Sensor Systems"

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A hybrid DV-Hop for localization in large scale Wireless sensor Networks 09

A hybrid DV-Hop for localization in large scale Wireless Sen...

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6th international conference on Mobile Technology, Application and systems, Mobility '09

作者： Yassine, Fawzi Safa, Haidar American University of Beirut Depatment of Computer Science Beirut Lebanon

ISBN: (纸本)9781605585369

Localization has been a major challenge in Wireless sensor Networks (WSN) because without finding the position of the sensor that is reporting sensed data, the data reported will not be useful. However, most of the previous localization approaches demand that sensors have plenty of resources like power, memory, or extra hardware used for ranging. In this paper we propose a new localization algorithm that accurately localizes sensors while minimizing power consumption and memory requirement of the sensors, and without depending on any extra hardware. Moreover, the proposed algorithm does not necessitate the presence of many nodes with preconfigured positions, or anchor nodes. In the proposed algorithm, anchors are placed in a circle or a semi-circle around the perimeter of the WSN. Not only this placement strategy leads to more accurate localization, but also it is very convenient for WSNs used for environment monitoring or military surveillance or tracking applications, since in these applications it is not convenient to deploy anchors in the middle of a hostile or enemy terrain. Copyright © 2009 ACM.

关键词： sensor nodes

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From physical models to well-founded control

From physical models to well-founded control

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6th ieee international Workshop on Engineering of Autonomic and Autonomous systems

作者： Dobson, Simon Coyle, Lorcan O'Hare, G. M. P. Hinchey, Mike UCD Dublin IE Lero Irish Software Engn Res Ctr Dublin Ireland UCD Dublin IE Clar Ctr Sensor Web Technol Dublin Ireland Univ Limerick IE Lero Irish Software Engn Res Ctr Limerick Ireland

ISBN: (纸本)9780769536231

Mobile sensors are an attractive proposition for environmental sensing, but pose significant engineering problems. Not least amongst these is the need to match the behaviour of the sensor platform to the physical environment in which it operates. We present initial work on using models of physical processes to generate models for autonomic control, and speculate that these can be used to improve the confidence we can place in sensed data.

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FOCUS: A Cost-Effective Approach for Large-Scale Crop Monitoring with sensor Networks

FOCUS: A Cost-Effective Approach for Large-Scale Crop Monito...

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6th international conference on Mobile Adhoc and sensor systems

作者： Yuan, Yuan Li, Shanshan Wu, Kui Jia, Weijia Peng, Yuxing Natl Univ Def Technol Dept Comp Sci Changsha Hunan Peoples R China City Univ Hong Kong Dept Comp Sci Hong Kong Peoples R China Univ Victoria Dept Comp Sci Victoria BC Canada

ISBN: (纸本)9781424451142

Current investment in crop monitoring consumes a large amount of financial cost, and how to reduce this cost has been a long-standing problem in agriculture. Traditional crop monitoring approaches are not cost-effective, because they rely on either heavy human labor or intensive computation with expensive instruments. In this paper, we explore the possibility of deploying networked sensor nodes for low-cost crop monitoring. As an example, we compute an important agricultural metric called global leaf area index (LA!) to illustrate the benefit of using sensor networks. We propose an approach called FOCUS that incrementally deploys sensor nodes into farmland to improve the accuracy of global LA! measurements. We design and implement a novel algorithm that calculates the total size of crop leaves with light intensity readings captured by the sensors under the crop canopies. FOCUS not only lowers the deployment cost considerably but also reduces the number of sensors for the long-term monitoring. through a small-scale field test and large-scale simulations, we validate our design and show its effectiveness in crop monitoring.

关键词： sensor nodes

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MCC: Model-based Continuous Clustering in wireless sensor networks

MCC: Model-based Continuous Clustering in wireless sensor ne...

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6th international conference on Fuzzy systems and Knowledge Discovery, FSKD 2009

作者： Hu, Haifeng Ma, Xiuli Tang, Shiwei Chen, Guanhua Zhao, Qisheng Ministry of Education School of EECS Peking University Beijing 100871 China

ISBN: (纸本)9780769537351

Nowadays, many sensor network applications are not only interested in the raw data of a single sensor node, but also the overview distribution features of network-wide sensory data. Data-centric clustering can provide an overview of the sensory data distribution. However most data-centric clustering researches are based on snapshot data rather than evolving data, which is not feasible as data evolves. In this paper, we propose a novel clustering method in wireless sensor networks called MCC: Model-based Continuous Clustering. In MCC, we do the clustering in a continuous way to make every node belong to the most suitable cluster at every epoch which guarantees that the clustering structure can represent the upto-date data distribution to the most extent. Moreover, we build a model for every sensor node based on its recent data to capture the data evolving trend. MCC is based on these models. the extensive experiments on real-datasets show the effectiveness and efficiency of MCC. © 2009 ieee.

关键词： sensor nodes

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Argus: A Light-Weighted Secure Localization Scheme for sensor Networks

Argus: A Light-Weighted Secure Localization Scheme for Senso...

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6th international conference on Autonomic and Trusted computing

作者： Zhu, Wen Tao Xiang, Yang Chinese Acad Sci Grad Univ State Key Lab Informat Secur Beijing 100049 Peoples R China Univ Queensland Sch Management & informat Syst Brisbane Qld 4072 Australia

ISBN: (纸本)9783642027031

Rapid technological advances have enabled the development of wireless sensor networks for various monitoring tasks. Usually the involved applications are dependant on the location knowledge of the low-cost sensor nodes, the majority of which are non-beacon nodes whose positions are yet to be discovered. We present Argus, a light-weighted position estimation scheme for sensor networks, to address the problem of localizing non-beacon nodes, with the location references obtained from a few beacon nodes whose positions are known apriori. We first determine certain geometric reference points and evaluate them with a voting procedure. then the position of a non-beacon node of concern is estimated with the geometric centroid of the identified most valuable reference points. Simulation results show that even when a few of the available beacon nodes are malfunctioning, our scheme can tolerate those misleading location references, and still provide a dependable localization service.

关键词： Wireless sensor network beacon and non-beacon nodes secure localization fault-tolerance dependable computing

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Energy-efficient On-demand Active Contour Service for sensor Networks

Energy-efficient On-demand Active Contour Service for Sensor...

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6th international conference on Mobile Adhoc and sensor systems

作者： Zhou, Yangfan Xiong, Junjie Lyu, Michael R. Liu, Jiangchuan Ng, Kam-Wing Chinese Univ Hong Kong Dept Comp Sci & Engn Shatin Hong Kong Peoples R China Simon Fraser Univ Sch Comp Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781424451142

Contour mapping is an important technique for Wireless sensor Networks (WSNs) in environmental monitoring to abstract the information of a monitored field. State-of-the-art approaches for contour mapping, however, are neither energy-optimized, nor capable of handling heterogeneous user requests. In this paper, we develop a novel energy-efficient On-demand Active Contour Service (OACS) for power-constrained WSNs. OACS regresses the field intensity function with kernel Support Vector Regression (SVR), a novel machine learning tool that flexibly handles both contour line and contour map requests. OACS also adaptively accommodates a wide range of contour line/map precision requirements: (I) For applications of low precision, only a minimum set of nodes are scheduled in working mode while others are sleeping for conserving energy. (2) For applications of high precision, through an active and progressive learning algorithm, OACS determines the best set of nodes that should be turned on for improving the contour line/map precision. Evaluation based on diverse realistic models demonstrates that OACS provides quality and seamless contour services for various application requirements yet significantly conserves energy.

关键词： Wireless sensor networks

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Demo Abstract: ieee 802.15.4a-Based Anchor-free Mobile Node Localization System

Demo Abstract: IEEE 802.15.4a-Based Anchor-free Mobile Node ...

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8th international Symposium on Information Processing sensor Networks

作者： Yoon, Chanmin Choi, Haksoo Lee, Seungwoo Cha, Hojung Song, Byunghun Lee, Hyungsu Yonsei Univ Dept Comp Sci Seoul 120749 South Korea KETI Convergence Res Ctr RFID USN Seongnam South Korea

ISBN: (纸本)9781424451081

We demonstrate an anchor-free mobile node localization system using Ymote, which is equipped with the ieee 802.15.4a RF module based on Chirp Spread Spectrum (CSS) technology. In contrast to conventional centralized systems, our system is fully distributed, hence scalable, and enables self-positioning in anchor-free environment. the localization system is implemented on the RETOS operating system.

关键词： ieee 802.15.4a sensor Networks Node Localization

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DAR: A dynamic anchor regrouping scheme for securing localization service against wormhole attacks in wireless sensor networks

DAR: A dynamic anchor regrouping scheme for securing localiz...

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6th international conference on Networked Sensing systems, INSS2009

作者： Guan, Yong Wei, Yawen Yu, Zhen Department of Electrical and Computer Engineering Iowa State University Ames IA 50011 United States

ISBN: (纸本)9781424463145

Localization in Wireless sensor Networks is vulnerable to wormhole attacks, in which adversaries record beacon messages at one position, transmit them through a wormhole tunnel and replay at another location. Some existing schemes against wormhole attacks either require special hardware or increase computation/communication overhead on sensors. In this paper, we propose a lightweight Dynamic Anchor Regrouping (DAR) scheme for sensors' localization against wormhole attacks. In our scheme, anchors within some small local areas organize themselves into groups, and a sensor estimates its location using beacon messages from anchors that belong to the same group. Our scheme is lightweight because the major computation is conducted by anchors, meanwhile, no extra communication overhead is incurred on sensors. By carefully controlling the group size, DAR can greatly reduce localization errors of sensors and increase the percentage of sensors that can localize themselves. ©2009 ieee.

关键词： Computer crime

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Deadlock Detection Views of distributed Database

Deadlock Detection Views of Distributed Database

引用

6th international conference on Information Technology - New Generations (ITNG 2009)

作者： Alom, B. M. Monjurul Henskens, Frans Hannaford, Michael Univ Newcastle Sch Elect Engn & Comp Sci Callaghan NSW 2308 Australia

ISBN: (纸本)9781424437702

Deadlock detection is very difficult in a distributed database system because no controller has complete and current information about the system and data dependencies. the deadlock problem is intrinsic to a distributed database system which employs locking as its concurrency control algorithm. this paper attempts a comprehensive study of deadlock detection in distributed database systems. Afterwards, a deadlock detection algorithm is presented. the algorithm is based on creating Linear Transaction Structure (LTS), distributed Transaction Structure (DTS), finding local and global cycle, deciding priority Id of the transaction and local-global abortion. the proposed algorithm does not detect any false deadlock or exclude any really existing deadlocks. In this technique global deadlock is not dependent on the local deadlock.

关键词： Deadlock Cycle Priority_Id Transaction Queue (TQ) TWFG Transaction Manager (TM)

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Rod Shape Testing by High Frequency Eddy Current-Passive Impedance Measurement

Rod Shape Testing by High Frequency Eddy Current-Passive Imp...

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6th international Multi-conference on systems, Signals and Devices

作者： Weidenmueller, Jens Sehestedt, Christian Kanoun, Olfa Himmel, Joerg Univ Appl Sci Koblenz Lab Sensor Technol & Measurement Engn RheinAhrCampus D-53424 Remagen Germany Tech Univ Chemnitz Fak Elektro & Informat Tech D-09111 Chemnitz Germany

ISBN: (纸本)9781424443451

For the rod shape measurement of hot rolled round steel bars (rods) the high frequency eddy current method is especially well suited as it requires no contact point and is not limited to bellow the Curie Temperature. Defects of the rod's shape can he detected by measuring the impedance spectrum of the RLC-oscillator. In the first laboratory setup [1] an Agilent Impedance Analyser was used for initial tests. Nevertheless, this setup cannot be applied in a steel plant due to the difficult environmental conditions. Hence, a Vector Network Analyser for passive impedance measurement that is applicable in these surroundings was developed.

关键词： Eddy Current Rod Shape Measurement Vector Network Analyzer Surface Testing Roundness Roll Displacement

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