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检索条件"任意字段=3rd International Symposium on Information Processing in Sensor Networks"

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A variational message passing algorithm for sensor self-localization in wireless networks

A variational message passing algorithm for sensor self-loca...

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IEEE international symposium on information Theory

作者： Claus Pedersen Troels Pedersen Bernard H. Fleury Section Navigation and Communications Department of Electronic Systems Aalborg University Aalborg Denmark

ISBN: (纸本)9781457705960

We propose a novel algorithm for sensor self-localization in cooperative wireless networks where observations of relative sensor distances are available. The variational message passing (VMP) algorithm is used to implement a mean field solution to the estimation of the posterior probabilities of the sensor positions in an R 2 scenario. Extension to R 3 is straight-forward. Compared to non-parametric methods based on belief propagation, the VMP algorithm features significantly lower communication overhead between sensors. This is supported by performance simulations which show that the estimated mean localization error of the algorithm stabilizes after approximately 30 iterations.

关键词： Message passing Wireless sensor networks Approximation algorithms Mobile communication Noise Signal processing algorithms Wireless networks

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EcoIMU: A compact, wireless, gyro-free inertial measurement unit based on two triaxial accelerometers

EcoIMU: A compact, wireless, gyro-free inertial measurement ...

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international symposium on information processing in sensor networks (IPSN)

作者： Yi-Lung Tsai Ting-Ting Tu Pai H. Chou Department of Computer Science National Tsing Hua University Hsinchu Taiwan Center of Embedded Computer Systems University of California Irvine CA USA

EcoIMU is a gyro-free, wearable inertial measurement unit (IMU) built with a pair of triaxial accelerometers that are spatially separated and wirelessly connected. It can output the translation and rotation of the body for the purpose of motion tracking and dead reckoning applications. It mitigates error accumulation and drift problems using domain knowledge including pause identification and geometric constraints on the two nodes. This demo shows the EcoIMU system in action by tracking all six degrees of freedom, namely triaxial translation and rotation and showing the results in a 3D animated cube.

关键词： Accelerometers Acceleration Three dimensional displays Tracking Wireless sensor networks sensors Measurement units

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Probabilistic addressing: Stable addresses in unstable wireless networks

Probabilistic addressing: Stable addresses in unstable wirel...

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international symposium on information processing in sensor networks (IPSN)

作者： Muhammad Hamad Alizai Tobias Vaegs Olaf Landsiedel Stefan Götz Jó Ágila Bitsch Link Klaus Wehrle Communication and Distributed Systems RWTH Aachen University Germany

Unreliable connectivity and rapidly changing link qualities make it challenging to establish stable addressing in wireless networks. This is especially difficult in communication scenarios where nodes determine their own addresses based on the underlying connectivity in the network. In this paper, we present Probabilistic ADdressing (PAD), a virtual coordinate based addressing mechanism that efficiently deals with dynamic communication links in wireless networks. It assigns probabilistic addresses to nodes without needing to pessimistically estimate links over longer periods of time. The routing metric predicts the current location of a node in its address distribution. Our prototype implementation over real testbeds compares PAD with Beacon Vector Routing (BVR), a prominent routing approach in sensornets, and S4, a cluster based extension of BVR and state-of-the-art in point-to-point routing in sensornets. Our results from three widely used testbeds indicate that PAD achieves 3-7 times more stable addressing than BVR, and minimizes the number of transmissions in the network by 26% when compared with S4 under challenging networking conditions.

关键词： Routing History Probabilistic logic Probability distribution Routing protocols Ad hoc networks Network topology

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Poster abstract: Accurate monitoring of circardian rhythms using wearable Body sensor networks

Poster abstract: Accurate monitoring of circardian rhythms u...

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international symposium on information processing in sensor networks (IPSN)

作者： Carlo Alberto Boano Matteo Lasagni Kay Römer Tanja Lange Institute of Computer Engineering University of Lübeck Germany Department of Neuroendocrinology University of Lübeck Germany

Monitoring the impact of sleep deprivation on thermoregulation requires a careful measurement of skin temperature across the human body to have precise knowledge and understanding of the stability of circadian rhythms, the 24-hour cycles of biological activity. However, medical measurements and clinical trials are often carried out in controlled lab settings, which limits the realism and the duration of data collections, and increases significantly their costs. We aim to provide medical researchers studying the stability of the circadian rhythms with a tool for higher quality data collections. We design and develop a wireless unobtrusive monitoring system for accurate body temperature measurements to be worn by patients for several weeks while they live their normal life. Obtaining a long-lasting highly-accurate measurement system is challenging, as energy and computational resources are severely constrained in miniaturized wearable sensor nodes. We develop a prototype of an active temperature measurement system with 0.02°C accuracy, a lifetime of up to 3 weeks, and real-time feedback to a remote medic. Our preliminary experiments show that we can identify the circadian rhythms also in non-ambulatory environments, indicating that our tool could become a valuable asset for medical research.

关键词： Temperature measurement Temperature sensors Skin Monitoring Circadian rhythm Accuracy

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Thermocouple Signal Conditioning with Genetic Optimizing RBF Neural networks

Thermocouple Signal Conditioning with Genetic Optimizing RBF...

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2011 IEEE 3rd international Conference on Communication Software and networks(ICCSN 2011)

作者： Guo Li-Hui,Wang Wu Xuchang University School of Electrical and information Engineering Xuchang,China Jiao Xiao-bo Xuchang Electric power company Power telecommunication Center Xuchang,China

Thermocouple sensor for temperature measurement has been widely used,however,the increase of precision is constrained due to the shortcoming of hardware based or table look up method,especially with nonlinear adjustment and cold end compensation.A new method was presented to compensate nonlinearity and cold-side-offset for signal processing of thermocouple with RBF neural *** structure of RBF neural networks was proposed and optimized with genetic algorithm,the principle of temperature measurement with thermocouple was analyzed and the neural networks model for signal conditioning was *** simulation experiments show that the algorithm can improve network generation ability and high accurate compensation and nonlinear adjustment for cold-side-offset was realized effectively.

关键词： thermocouple RBF neural networks signal conditioning genetic algorithm simulation

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Farmland Water Potential Soft-sensing Network Based on WSN

Farmland Water Potential Soft-sensing Network Based on WSN

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2011 3rd international Asia Conference on Informatics in Control, Automation and Robotics (CAR 2011 LNEE 132)

作者： Liguo Tian Meng Li Zhiliang Chen Shengli Lu Yue Liu Key laboratory of Information Sensing & Intelligent Control Tianjin University of Technology and Education Tianjin Modern Vocational Technology College

According to the needs of modern agriculture on the crop microenvironment information, the farmland water potential(FWP) soft-sensing network based on WSN could achieve crop micro-environment information collection, processing and transmission. The system was made up of the imbedded gateway and several WSN nodes, and configured relevant WSN nodes based on the requirements of the FWP soft-sensing, such as humiture collection node, illuminance collection node and CO2 concentration collection node etc. The imbedded gateway received the data of all microenvironment information nodes, estimated the FWP value in real-time and communicated with the remote data center. In practical application, it works well.

关键词： Wireless sensor networks(WSN),Farmland Water Potential(FWP),Zig Bee,Data Acquisition

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Fault-tolerant Data Aggregation Scheme for Monitoring of Critical Events in Grid based Healthcare sensor networks 11

Fault-tolerant Data Aggregation Scheme for Monitoring of Cri...

引用

Simulation Multiconference

作者： Ather Saeed Andrew Stranieri Richard Dazeley Center for Informatics and Applied Optimization University of Ballarat and Melbourne Institute of Technology

ISBN: (纸本)9781617828409

Wireless sensor devices are used for monitoring patients with serious medical conditions. Communication of content-sensitive and context sensitive datasets is crucial for the survival of patients so that informed decisions can be made. The main limitation of sensor devices is that they work on a fixed threshold to notify the relevant Healthcare Professional (HP) about the seriousness of a patient's current state. Further, these sensor devices have limited processor, memory capabilities and battery. A new grid-based information monitoring architecture is proposed to address the issues of data loss and timely dissemination of critical information to the relevant HP. The proposed approach provides an opportunity to efficiently aggregate datasets of interest by reducing network overhead and minimizing data latency. To narrow down the problem domain, in-network processing of datasets with Grid monitoring capabilities is proposed for the efficient execution of the computational, resource and data intensive tasks. Interactive wireless sensor networks do not guarantee that data gathered from the heterogeneous sources will always arrive at the sink (base) node, but the proposed aggregation technique will provide a fault tolerant solution to the timely notification of a patient's critical state. Experimental results received are encouraging and clearly show a reduction in the network latency rate.

关键词： Data aggregation Grid computing In-network processing sensor networks Fault-tolerance unified retrieval models Fault tolerance sensor networks Grid computing grids Grid Dataset Device sensor data delay data loss Patient Monitoring

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The research of Wireless sensor networks optimization algorithm based on the energy control

The research of Wireless Sensor Networks optimization algori...

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3rd international symposium on information processing, ISIP 2010

作者： Liu, Ban-Teng Chen, You-Rong Zhou, Kai Jingyu, Hua College of Information Zhejiang Shuren University Hangzhou China College of Information Zhejiang University of Technology Hangzhou China

ISBN: (纸本)9780769542614

Wireless sensor networks(WSN) is a hot spot of the research of wireless networks currently, the key of achieving efficient transmission business is to control node energy and improve the network lifetime in wireless sensor networks. The paper first uses Boolean sensing model based on Poisson point process to identify the function of the rate of coverage and the node density in unit area, and then calculates the total number of nodes in the region, next uses the greedy strategy of the Prim algorithm to find a spanning tree with the maximum weight, and constructs a approximate solution for the minimum connected dominating set. In order to control the commotions of the nodes, make the nodes in spanning tree to work, and other nodes are in sleep state. At last, further analyses the relationship between the number of nodes in connected dominating and the coverage radius. © 2010 IEEE.

关键词： sensor nodes

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A new data transmission protocol in delay tolerant mobile wireless sensor networks

A new data transmission protocol in delay tolerant mobile wi...

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3rd international symposium on information processing, ISIP 2010

作者： Xu, Jian-Bo Hou, Jia-Tao School of Computer Science and Engineering Hunan University of Science and Technology Xiangtan China

ISBN: (纸本)9780769542614

This paper presents a new data transmission protocol in Delay Tolerant Mobile Wireless sensor networks, which divides the data transmission process into two phases: data reception phase and data forwarding phase, mainly fulfilling through analyzing the state of mobile nodes and using Hand up mechanism. Simulation result shows that, through the implementation of two phases, we can obtain a higher message delivery rate of success under the lower energy consumption and data delivery delay. © 2010 IEEE.

关键词： Energy utilization

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Remote diagnosis in traditional Chinese medicine using wireless sensor networks

Remote diagnosis in traditional Chinese medicine using wirel...

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3rd international symposium on information processing, ISIP 2010

作者： Dong, Zhengyu Xiang, Hongmei He, Weisong Chongqing College of Electronic Engineering Chongqing 401331 China

ISBN: (纸本)9780769542614

Traditional Chinese Medicine (TCM) has received considerable attention due to addressing its the real cause of the illness while western medicine treats symptoms. However, the TCM hospitals can not satisfy all those ever-increasing requirements of medical care resources when people pay more and more attention to their health conditions. In this paper, a wireless-sensor-networks-based TCM system for remote pulse information diagnosis, called RTCPDS (Remote Traditional Chinese Pulse Diagnosis System), is introduced. A proposed wearing system may collect the pulse image, analyze the information by data fusion and provide diagnostic results. The paper we also introduce spatio-time correspondence principle for comprehending pulse information. Those results indicate significant practical feasibility of the RTCPDS. © 2010 IEEE.

关键词： Wireless sensor networks

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