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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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FPGA IMPLEMENTATION OF A NEURAL NETWORK CLASSIFIER FOR GAS sensor ARRAY APPLICATIONS

FPGA IMPLEMENTATION OF A NEURAL NETWORK CLASSIFIER FOR GAS S...

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

作者： Benrekia, Faycal Attari, Mokhtar Bermak, Amine Belhout, Khaled UYFM Medea Dept Elect Engn Ain Dheb 26000 Medea Algeria USTHB LINS Lab Instrumentat Fac Elect & Comp Algiers 16111 Algeria Hong Kong Univ Sci & Technol Dept Elect Engn Kowloon Hong Kong Peoples R China

ISBN: (纸本)9781424443451

A primitive gas recognition system which can discriminate limited species of industrial gas was designed and simulated. the 'electronic nose' consists of an array of 8 micro-hotplate based SnO2 thin film gas sensors with different selectivity patterns, signal collecting unit and a signal pattern recognition and decision part in programmable logic device chip. BP (Back Propagation) neural networks with Multilayer Perceptron structure was designed and implemented on FPGA (Field Programmable Gate Array), of twenty thousand gate level chip by VHDL language for processing the input signals from 8 kinds of gas sensors. the network contained eight input units, one hidden layer with 4 neurons and output with 5 regular neurons. the 'electronic nose' system successfully discriminated 5 kinds of industrial gases in computer simulation. A small application has been tested on the APS X208 FPGA test board.

关键词： E-nose Gas sensor Neural network classifier VHDL FPGA-implementation

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SoC Li-ion BATTERY MONITORING WIth IMPEDANCE SPECTROSCOPY

SoC Li-ion BATTERY MONITORING WITH IMPEDANCE SPECTROSCOPY

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

作者： Cuadras, A. Kanoun, O. Univ Politecn Cataluna Dept Elect Engn Castelldefels Sch Technol EPSC Av Canal Olimp 15 Castelldefels 08860 Spain Tech Univ Chemnitz Chair Measurement & Sensor Technol D-09107 Chemnitz Germany

ISBN: (纸本)9781424443451

the state of charge (SoC) of Li-ion coin batteries is investigated as a function of impedance variation. Batteries are submitted to highly stressed conditions to simulate the operation of active loads and impedance is measured in real time both for charge and discharge. In particular, modulus and phase dependence as a function of SoC is studied with impedance spectroscopy in the range 40 Hz to 20 kHz. Phase is found to be the most sensitive parameter. It decreases with battery discharge and increases with battery charge. Impedance is simply modelled with a 3 parameters circuit, two resistors and a constant phase element (CPE). Selected frequencies are then proposed to estimate the SoC of the battery.

关键词： battery impedance phase measurement Li-ion

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System Monitoring with Metric-Correlation Models: Problems and Solutions 09

System Monitoring with Metric-Correlation Models: Problems a...

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6th ACM/ieee international conference on Autonomic computing and Communications (ICAC 09)

作者： Jiang, Miao Munawar, Mohammad A. Reidemeister, thomas Ward, Paul A. S. Univ Waterloo Dept Elect & Comp Engn Shoshin Distributed Syst Grp Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781605585642

Correlations among management metrics in software systems allow errors to be detected and their cause localized. Prior research shows that linear models can capture many of these correlations. However, our research shows that several factors may prevent linear models from accurately describing correlations, even if the underlying relationship is linear. Two common phenomena we have observed are relationships that evolve, typically with time and heterogeneous variance of the correlated metrics. Two-variable linear models proposed thus far fail to capture these phenomena., and thus fail to describe system dynamics correctly. Often, these phenomena are caused by a missing variable. However, searching for three-variable correlations is O(n(3)) for n metrics, which is costly for systems with many metrics. In this paper we address the above challenges by improving on two-variable Ordinary Least Squares regression models. We validate our models using a. realistic Java-Enterprise-Edition application. Using fault-injection experiments we show that our improved models capture system behavior accurately. We detect errors within 8 sample periods on average from the injection of the fault, which is less than half the time required by the current linear-model approach.

关键词： system monitoring metric-correlation models multi-variable correlations heteroscedasticity

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distributed emulation for the design of active tag based systems

Distributed emulation for the design of active tag based sys...

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6th international conference on Networked Sensing systems, INSS2009

作者： Beuran, Razvan Nakata, Junya Okada, Takashi Kawakami, Tetsuya Chinen, Ken-Ichi Tan, Yasuo Shinoda, Yoichi National Institute of Information and Communications Technology Ishikawa Japan Japan Advanced Institute of Science and Technology Ishikawa Japan Panasonic Corporation Kanagawa Japan

ISBN: (纸本)9781424463145

Several choices have to be made during the design process of active tag based systems. Since the number of properties that must be decided before production and wide-scale deployment is relatively high, the use of real experiments in the design phase may be prohibitive. We propose the use of emulation for performing large-scale experiments with active tag based systems easily and in a repeatable manner. Such experiments can be used to validate the behavior of the system, and to decide the values for various system parameters. We illustrate this approach by experimental results obtained with an emulation framework that we designed and implemented for a pedestrian localization active tag based system. ©2009 ieee.

关键词： Wireless networks

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Yarn anomaly detection using K-th moment and entropy filters

Yarn anomaly detection using K-th moment and entropy filters

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

作者： Guojun, Sheng Yonggui, Dong Department of Precision Instruments and Mechanology Tsinghua University Beijing China

ISBN: (纸本)9780769537351

An optical yarn quality measurement system is constructed. To extract yarn defects of neps and foreign fibers with different colors, a novel structure of optoelectronic sensor is proposed. the experimental signals acquired by the system perform low signal to noise ratio therefore makes it difficult to defect discrimination. Concerning these problems, two methods, K-th moment filter and minimum entropy filter, are utilized for signal processing. the results indicate that both methods are effective for the extracting of abnormal signals corresponding to yarn defects. the K-th moment filter has the advantage of lower computational complexity and is more effective in on-line measurement system. On the other hand, the minimum entropy filter can remain more local tiny features in the processed signals by adjusting the parameters properly so that is better in anomaly detecting of the defects in different levels. © 2009 ieee.

关键词： Yarn

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Performance of Bulk Data Dissemination in Wireless sensor Networks

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5th ieee international conference on distributed computing in sensor systems

作者： Dong, Wei Chen, Chun Liu, Xue Bu, Jiajun Liu, Yunhao Zhejiang Univ Coll Comp Sci Zhejiang Key Lab Serv Robots Hangzhou Zhejiang Peoples R China McGill Univ Sch Comp Sci Montreal PQ H3A 2T5 Canada Hong Kong Univ Sci & Technol Dept Comp Sci Kowloon Peoples R China

ISBN: (纸本)9783642020841

Wireless sensor networks (WSNs) have recently gained a great deal of attention as a topic of research, with a wide range of applications being explored. Bulk data dissemination is a basic building block for sensor network applications. the problem of designing efficient bulk data dissemination protocols has been addressed in a number of recent studies. the problem of mathematically analyzing the performance of these protocols, however, has not been addressed sufficiently in the literature. In this work, we show a way of analyzing mathematically the performance of bulk data dissemination protocols in WSNs. Our model can be applied to general networks by use of the shortest propagation path. Our model is accurate by considering topological information, impact of contention, and impact of pipelining. We validate the analytical results through detailed simulations, and we find the analytical results fit well with the simulation results. Further, we demonstrate that the analytical results can be used to aid protocol design for performance optimizations, e.g., page size tuning for shortening the completion time.

关键词： Wireless sensor networks

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SecMCL: A Secure Monte Carlo Localization Algorithm for Mobile sensor Networks

SecMCL: A Secure Monte Carlo Localization Algorithm for Mobi...

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6th international conference on Mobile Adhoc and sensor systems

作者： Zeng, Yingpei Cao, Jiannong Hong, Jue Zhang, Shigeng Xie, Li Nanjing Univ State Key Lab Novel Software Technol Nanjing 210008 Peoples R China Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781424451142

Recently with the emergence of mobile sensor networks, localization for such networks has gained much attention, and many localization algorithms have been proposed. Among them the Sequential Monte Carlo (SMC) based algorithms are very popular because of their simplicity and efficiency. However, most current SMC-based localization algorithms implicitly assume there is no attacker in the network, which may not be true in real applications. the attackers, if any, may send false information by themselves or through compromised nodes to disturb the localization. In this paper, we present the design and evaluation of a Secure Monte Carlo Localization algorithm, SecMCL SecMCL provides authentication to messages and employs a new sampling method to defeat attacks. Simulation results show that SecMCL greatly improves the localization accuracy of existing SMC-based localization method when there are attacks. Also, compared with existing SMC localization method, SecMCL incurs no communication cost (in terms of number of messages) and achieves the same localization accuracy when there is no attack.

关键词： sensor networks

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EcoPlex: Empowering compact wireless sensor platforms via roaming and interoperability support

EcoPlex: Empowering compact wireless sensor platforms via ro...

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2009 6th Annual international conference on Mobile and Ubiquitous systems: Networking and Services, MobiQuitous 2009

作者： Chou, Pai H. Ke, Chung-Yi Ko, Nai-Yuan Hsueh, Chih-Hsiang Lee, Chih-Hsuan Department of Computer Science National Tsing Hua University Hsinchu 30013 Taiwan Center for Embedded Computer Systems University of California Irvine Irvine CA 92697-2625 United States

ISBN: (纸本)9789639799592

EcoPlex is an infrastructure that enables simple wireless platforms to participate seamlessly in a feature-rich, wireless ad hoc network. EcoPlex consists of gateways that are responsible for handoff support for mobility and high data rate without burdening the simple nodes to implement multi-hop protocols. the gateways also create virtual identities for simpler nodes to enable their participation in the feature-rich network without adding complexity to them. We demonstrate the feasibility of this idea with the ultra-compact wireless sensor platform called Eco to participate as virtual nodes in a fully general ZigBee network. Experimental results show EcoPlex to be efficient and scalable. the enhanced mobility and interoperability are added to the Eco platform at the infrastructure level, all with minimal node complexity.

关键词： Interoperability

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A compact hard real-time operating system for wireless sensor nodes

A compact hard real-time operating system for wireless senso...

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6th international conference on Networked Sensing systems, INSS2009

作者： Saruwatari, Shunsuke Suzuki, Makoto Morikawa, Hiroyuki Morikawa Laboratory Research Center for Advanced Science and Technology University of Tokyo Meguro-ku Tokyo 153-8904 Japan

ISBN: (纸本)9781424463145

the paper shows a compact hard real-time operating system for wireless sensor nodes called PAVENET OS. PAVENET OS provides hybrid multithreading: preemptive multithreading and cooperative multithreading. Both of the multithreading is optimized for two kinds of task on wireless sensor networks, and the kinds are real-time tasks and best-effort tasks. PAVENET OS can efficiently perform hard real-time tasks that cannot be performed by TinyOS. the paper demonstrates the hybrid multithreading realizes compactness and low overhead, which are comparable to those of TinyOS, through quantitative evaluation. the results show PAVENET OS performs 100-Hz sensor sampling with 0.01% jitter while performing wireless communication tasks, whereas optimized TinyOS has 0.62% jitter. In addition, PAVENET OS has a small footprint and low overhead (minimum RAM size: 29 bytes, minimum ROM size: 490 bytes, minimum task switch time: 23 cycles). ©2009 ieee.

关键词： Jitter

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Performance Monitoring in sensor Networks

Performance Monitoring in Sensor Networks

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

作者： Burrell, A. T. Papantoni-Kazakos, P. Oklahoma State Univ Dept Comp Sci 219 Math Sci Stillwater OK 74078 USA Univ Colorado Denver Dept Elect Engn Denver CO 80217 USA

ISBN: (纸本)9781424437702

the performance demands imposed on sensor networks carrying heterogeneous connections are challenging and can be satisfied via the deployment of highly dynamic statistical multiplexing protocols which honor the traffic Quality Of Service (QOS), while utilizing the network resources efficiently. While the successful design of high-performance traffic multiplexing protocols requires accurate modeling of traffic statistical characteristics and QOS, variations in the latter characteristics, topological network changes (some due to mobility and short sensor life time), and /or failures in the response of network components affect directly, and frequently dramatically, their performance characteristics. It is thus crucial that traffic and network performance monitoring techniques be deployed, first for the identification of traffic changes and network failures, and then for the subsequent adaptation of the protocol operations, the pertinent recovery of failures, and the appropriate reconfiguration of network topologies. In this paper, we describe an approach to the design and deployment of a distributed performance monitoring system.

关键词： Sequential Detection of Change Quality of Service

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