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A wireless sensor network for fat and hydration monitoring by bioimpedance analysis

A wireless sensor network for fat and hydration monitoring b...

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作者： Ramos, Javier Ausín, José L. Torelli, Guido Duque-Carrillo, J.F. Electronics and Electrical Engineering Department University of Extremadura Escuela de Ingenierías Industriales Avda. Elvas s/n 06071 Badajoz Spain Electronics Department University of Pavia Facultà di Ingegneria Via Ferrata 1 27100 Pavia Italy

ISBN: (纸本)9781424452538

this paper presents the design of a wearable system for remotely assessing hydration status and visceral fat accumulation by means of bioelectrical impedance (BI) analysis. Conventional wired BI measurement systems are not the best option for personalized monitoring of patients and senior citizens during their daily life activity. In order to provide an unobtrusive, ubiquitous, and individual-centered healthcare system, we developed a ZigBee-based mobile wireless sensor network, which consists of spatially distributed autonomous devices containing a BI measurement circuit integrated in 0.35-μm CMOS technology and a transceiver circuit that provides wireless communication. Both the system architecture and details of the different circuit blocks are discussed. © 2009 ieee.

关键词： Hydration

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Design of Context Analysis System on USN Environment

Design of Context Analysis System on USN Environment

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

作者： Jin, Cheng Hao Lee, Yongmi Sohn, Gyoyong Kim, Hi-Seok Ryu, Keun Ho Chungbuk Natl Univ Database Lab Cheongju South Korea Cheongju Univ Sch Elect & Informat Engn Cheongju South Korea

ISBN: (纸本)9781424437702

With advances in sensor techniques, much research is focused on USN (Ubiquitous sensor Network) computing services and context analysis service is an important field among them. However, sensor stream data, which is generated from sensors used in many USN domain applications, is too fast to control each of them and the volume is too huge to store the whole data. Hence, in order to provide rapid and reliable context analysis service over such sensor stream data, a context analysis system which supports the functionality of sliding window is needed. the context model used in this system is a WHEN-DO context analysis model. this context analysis model is designed to be used as follows: If the sensor stream data satisfies condition in 'WHEN' clause, then it will execute actions specified in 'DO' clause in WHEN-DO context analysis model. Hence, this system also works as the same way. First determine if the received sensor stream data satisfies condition in 'WHEN' clause, if the condition is satisfied with the value of received sensor stream data, then it will execute action in 'DO' clause in WHEN-DO context analysis model. Using WHEN-DO context analysis model in this system can take corresponding actions according to user defined conditions. Our proposed context analysis system can be applied to many other USN environment applications such as monitoring the status of a building and then taking actions to that condition.

关键词： sensor networks

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A distributed nodes' localisation approach in Wireless sensor Networks

A distributed nodes' localisation approach in Wireless Senso...

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international conference on Mobile and Ubiquitous systems: Networking and Services (MobiQuitous)

作者： Y. Hamam K. Djouani O.J. Oyedapo F'SATI Tshwane University of Technology TUT Pretoria South Africa

Node location is of main importance for several areas of applications based on Wireless sensor Networks (WSNs), for instance location-based services. In this paper, we propose a new distributed approach for nodes'position estimation based on distance measurements. Our approach is close to the cooperative approach based on Curvilinear Component Analysis (CCA) proposed in. the complexity of the proposed approach is O(N) for all the network, but as the approach is distributed, the computation time is quasi-constant per node in the network.

关键词： Wireless sensor networks Distance measurement Africa Computer networks distributed computing Target tracking Routing distributed algorithms Hardware Costs

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Control of grid-connected DC-AC Converters in distributed Generation: Experimental comparison of different schemes

Control of grid-connected DC-AC Converters in Distributed Ge...

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6th international conference and Workshop on Compatibility and Power Electronics

作者： Hornik, T. Zhong, Q. -C. Univ Liverpool Dept Elect & Elect Engn Liverpool L69 3BX Merseyside England

ISBN: (纸本)9781424428557

In this paper, different control schemes for grid-connected DC-AC power converters are discussed and compared with experimental results. the voltage controller based on H-infinity and repetitive control techniques is compared with a traditional proportional-integral (PI) controller implemented in synchronously rotating reference frame and a proportional resonant (PR) controller implemented in stationary reference frame, with main focus on harmonies distortion and DC current injection to the utility grid. the result shows that the H-infinity repetitive controller offers significant improvement in waveform quality and current harmonic distortion over conventional PI and PR controllers.

关键词： distributed power generation

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distributed threshold Selection for Aggregate threshold Monitoring in sensor Networks

Distributed Threshold Selection for Aggregate Threshold Moni...

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Consumer Communications and Networking conference, CCNC ieee

作者： Mohammad S. Talebi Ahmad Khonsari Ali Abbasi School of Computer Science Institute of Studies in Theoretical Physics and Mathematics Iran School of Computer Science ECE Department University of Tehran Iran ECE Department University of Tehran Iran

Motivated by applications like sensor, peer to peer, ad hoc networks there has been growing interest in monitoring large scale distributed systems. In these applications typically we wish to monitor a global system condition which is defined as a function of local network elements parameters. In this paper, we study Aggregate threshold Queries in sensor networks, which are used to detect when an aggregate value of all sensor measurements crosses a predetermined threshold. the major constraint in designing monitoring applications is reducing the amount of communication burden which is the dominant factor of energy drain in wireless sensor networks. In this study, we address the aggregate threshold monitoring problem by proposing a distributed algorithm to set local thresholds on each sensor node so that only those sensors whose measurements crosses their local thresholds commence communication. We adopt the FPTAS optimization formulation of the problem [1] and propose a distributed algorithm as the solution to the problem. Simulation results demonstrate the validity of the proposed distributed algorithm in attaining very close performance as the centralized scheme.

关键词： Aggregates Peer to peer computing Filters distributed algorithms Computerized monitoring sensor systems and applications Computer science Application software Large-scale systems Condition monitoring

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distributed lightweight target tracking for wireless sensor networks

Distributed lightweight target tracking for wireless sensor ...

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ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Sheng Wang Xue Wang Yong Wang Xinyao Sun State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing China

Target tracking is an important task addressed in wireless sensor network (WSN), because the resources of WSN are limited. A distributed lightweight particle filter algorithm is proposed to achieve robust target tracking with low resource requirement in the WSN consisting of acoustic sensor nodes. In the proposed algorithm, each sensor node carries out partial particle filter with its local data and the neighbor nodes' data in distributed manner. then local results of selected sensor nodes are fused to make final decision. To simplify the computation of particle filter, lightweight sampling and resampling schemes are introduced, where a simple range-free algorithm is adopted to restrict potential area of target's location. the experimental results verify that the proposed distributed lightweight particle filter algorithm can effectively achieve target tracking in WSN with low resource consumption. Compared to previous target localization algorithms, such as maximum likelihood estimation and centralized particle filter, the proposed algorithm has outstanding performance in accurate target tracking and low resources consumption.

关键词： Target tracking Wireless sensor networks Particle filters Acoustic sensors Sampling methods Hardware State estimation Instruments Robustness sensor fusion

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On Supporting the Design of Human-Provided Services in SOA

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6th international conference on Service-Oriented computing

作者： Schall, Daniel Dorn, Christoph Truong, Hong-Linh Dustdar, Schahram Vienna Univ Technol Distributed Syst Grp A-1040 Vienna Austria

ISBN: (纸本)9783642012464

Collaboration platforms evolve into service-oriented systems, promoting composite and user-enriched services. the problem we address in this paper is the support of human interactions in SOA. Current collaboration tools do not support humans to specify different interaction interfaces (services), which can be reused in various collaborations. We focus on the design of Human-provided Services (HPS). Our contributions center around two main aspects of human interactions in SOA: (i) ail approach for designing service interfaces embodying human activities as actions offered by Web (HPS) users;(ii) a tagging model for activities and services to recommend resources in the design process. We discuss techniques for mapping human activities onto Web services. We present a recommendation algorithm that is based on collaborative tagging of resources in SOA. Our algorithm helps to determine suitable resources drawn from properties of user preferences and measured similarity of human activities and actions.

关键词： Web services

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Source Location Anonymity for sensor Networks

Source Location Anonymity for Sensor Networks

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Consumer Communications and Networking conference, CCNC ieee

作者： Ali Abbasi Ahmad Khonsari Mohammad S. Talebi ECE Department University of Tehran Tehran Iran ECE Department School of Computer Science University of Tehran Iran School of Computer Science Institute of Studies in Theoretical Physics and Mathematics Iran

Motivated by applications like sensor, peer to peer networks there has been growing interest in monitoring large scale distributed systems. In these applications, source location anonymity is an attractive and critical security property. Most of prior works assumed a weak adversary model where the adversary sees only local network traffic, but here we consider source anonymity against a global eavesdropper. Attaining location unobservability under global attacker is very difficult and expensive to achieve, because sensor networks are very limited in resources. In this work we propose a distributed algorithm to mix real event traffic with carefully chosen dummy traffic to hide the real event traffic pattern. We assume that we have fixed amount of resources to send dummy traffic and we try to share it among sensors so as to maximize the degree of anonymity of the system. through simulation, we illustrate that the proposed technique is efficient in protecting location information from the eavesdropper.

关键词： Position measurement Telecommunication traffic Traffic control sensor systems and applications Peer to peer computing Monitoring Large-scale systems distributed algorithms sensor systems Protection

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Adaptive random sensor selection for field reconstruction in wireless sensor networks 09

Adaptive random sensor selection for field reconstruction in...

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6th international Workshop on Data Management for sensor Networks, DMSN'09 - in conjunction with the 35th international conference on Very Large Data Bases

作者： Santini, Silvia Colesanti, Ugo Institute for Pervasive Computing ETH Zurich Clausiustrasse 59 CH-8092 Zurich Switzerland Sapienza Università di Roma Via Ariosto 25 IT-00185 Rome Italy

ISBN: (纸本)9781605587776

Wireless sensor networks (WSNs) allow for the sampling of a physical phenomenon over long periods of time and across extended geographical areas [1]. Once reported to a central collecting unit, the samples may be used to reconstruct the developing of the physical phenomenon of interest -- also referred to as signal or sensor field -- in both time and space. Work in information theory [3] shows that a reliable signal reconstruction is possible if a sufficiently large number of nodes sample the signal at sufficiently close time and space intervals. Clearly, the achievable quality of the reconstruction can be maximized by letting the highest possible number of nodes collect and report samples. However, on typical sensor nodes, sensing and communication modules require the largest amount of energy and their continuous use can rapidly deplete node batteries [1]. Limiting the number of nodes actively participating in sensing and communication is thus the most effective way to increase the lifetime of both single sensor nodes and the network as a whole [2, 5]. sensor selection algorithms can be used to schedule individual sensing activity in order to balance the accuracy of the reconstruction with energy consumption. In real WSNs deployments, the irregular spatial distribution of the nodes typically produces nonuniform sampling geometries that and reconstruction techniques able to deal with scattered samples must thus be used. In this context, the ACT reconstruction algorithm [3, Chapter 6] is one of the most computationally efficient and robust techniques known in literature and appears as a perfect fit to perform field reconstruction in WSNs. In particular, the ACT can deal with both very irregular sampling geometries and presence of noise in the data. However, the more the sampling geometry resembles a uniform grid, the better the performance of the ACT. With these considerations in mind, we investigate sensor selection strategies able to generate, given the constraints

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An Adapting Random Walk for Ad Hoc and sensor Networks

An Adapting Random Walk for Ad Hoc and Sensor Networks

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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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