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distributed Agents Network for Ubiquitous Monitoring and Services Exploitation

Distributed Agents Network for Ubiquitous Monitoring and Ser...

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ieee international conference on Computational Science and Engineering, CSE

作者： Rocco Aversa Beniamino Di artino Salvatore Venticinque Department of Information Engineering Second University of Naples Campania Italy Dep. of Information Engineering Second University of Naples Aversa (CE) Italy Universita degli Studi della Campania Luigi Vanvitelli Napoli Campania IT

Many application contexts noways are characterized by pervasiveness of embedded systems in crowded environments of everyday life. To accomplish common requirements ubiquitous computing must address many issues such as communication among users, services and sensors, security, interoperability, collection of information and context representation. Here we present a distributed solutions based on autonomous agents which represent the connection between services and services extensions, implemented by pervasive sensors and actuators. We focus on supervision and control of human activities, which can be automatically assisted. In particular we developed a prototype application that allow to check the compliance with safety standards of working activities in a constructing site.

关键词： Monitoring Context Embedded system Ubiquitous computing sensor phenomena and characterization Communication system security Information security Context-aware services Autonomous agents Actuators

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A distributed algorithm for hexagonal topology formation in wireless sensor networks

A distributed algorithm for hexagonal topology formation in ...

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international conference on Emerging Technologies and Factory Automation (ETFA)

作者： K. Shashi Prabh Chinmay Deshmukh Shikhar Sachan Centro de Investigação em Sistemas de Tempo-Real Instituto Superior de Engenharia do Porto Portugal Department of Computer Science Indian Institute of Technology Guwahati India

ISBN: (纸本)9781424427277

Hexagonal wireless sensor network refers to a network topology where a subset of nodes have six peer neighbors. These nodes form a backbone for multi-hop communications. In a previous work, we proposed the use of hexagonal topology in wireless sensor networks and discussed its properties in relation to real-time (bounded latency) multi-hop communications in large-scale deployments. In that work, we did not consider the problem of hexagonal topology formation in practice - which is the subject of this research. In this paper, we present a decentralized algorithm that forms the hexagonal topology backbone in an arbitrary but sufficiently dense network deployment. We implemented a prototype of our algorithm in NesC for TinyOS based platforms. We present data from field tests of our implementation, collected using a deployment of fifty wireless sensor nodes.

关键词： distributed algorithms Network topology Wireless sensor networks Peer to peer computing Spine Delay Spread spectrum communication Large-scale systems Prototypes Testing

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Auction-based congestion management for target tracking in wireless sensor networks

Auction-based congestion management for target tracking in w...

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ieee international conference on Pervasive computing and Communications (PerCom)

作者： Lei Chen Boleslaw K. Szymanski Joel W. Branch Department of Computer Science Rensselaer Polytechnic Institute Troy NY USA IBM Thomas J. Watson Research Center Hawthorne NY USA

This paper addresses the problem of providing congestion-management for a shared wireless sensor network- based target tracking system. In many large-scale wireless sensor network target tracking scenarios (e.g., a surveillance system for tracking vehicles in urban environments), multiple targets may converge within close proximity of each other. Such scenarios may cause network congestion as nearby sensors attempt to concurrently send updates to a data aggregation point (e.g., base station). We consider the case in which this problem is further complicated by two factors. First, such a large-scale sensor network may very well be deployed to serve multiple target tracking applications with different and dynamic priorities and interests in different (types of) targets. Second, each application will most likely place a different premium on the timeliness of the target information (principally defined by some quality metric) they receive. All the above challenges introduce formidable challenges in providing the expeditious delivery of target information to all prioritized applications. In this paper, we advocate the use of a distributed auction-based approach to locally manage network bandwidth allocation in the described context. We use the Second Price Auction mechanism (to ensure incentive compatibility) in which the congested node acts as the auctioneer and the packets carrying target updates act as bidders. Their bid values are defined by the loss of information utility to the applications associated with the packets. The winning packet receives the current transmission slot of the auctioneer node. We demonstrate through simulation that the resulting auction allocates bandwidth efficiently, maximizing the collective applications' goals, even when the application priorities change dynamically.

关键词： Target tracking Wireless sensor networks Monitoring Chemical sensors Feedback loop sensor phenomena and characterization Delay Large-scale systems Vehicle dynamics Space technology

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An indoor navigation system for autonomous mobile robot using wireless sensor network

An indoor navigation system for autonomous mobile robot usin...

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ieee international conference on Networking, Sensing and Control

作者： Siyao Fu Zeng-Guang Hou Guosheng Yang College of Information and Engineering Central University for Nationalities China Laboratory of Complex Systems and Intelligence science Institute of Automation Chinese Academy and Sciences Beijing China

Recently, considerable attention has been focused on the investigation of the use of wireless sensor networks (WSN) to drive autonomous mobile robot for navigation in flexible, indoor environments instead of fixed locations, for their potential as a cheap, easily deployed, and distributed monitoring tool. However, such composite net systems are nontrivial to design for the robot systems typically assume the map known in advance, or they need to build the map while moving around, with the help of acquired sensor network infrastructure information. The key component for determining the robot's pose by the information of physical location of the sensor nodes after they have been deployed is known as the problem of localization. In this paper we propose an environment map free navigation algorithm based on RF wireless sensor networks for an indoor autonomous mobile robot. In our navigation system, the robot can navigate autonomously without the need for a map, by acquiring the information of pre-set radio emission sensors deployed in an indoor environment. By measuring the distance from one sensor node after another using triangular localization method, the robot locates itself and knows its pose. The proposed algorithm is conceptually simple and easy to implement. Our approach is applied to a mobile robot platform, simulation and experimental results show that good localization can be achieved using the proposed method.

关键词： Mobile robots Wireless sensor networks Robot sensing systems sensor systems Intelligent sensors Robot kinematics Indoor environments Radio navigation Wireless communication Pervasive computing

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Almost optimal distributed M2M multicasting in Wireless Mesh Networks

Almost optimal distributed M2M multicasting in Wireless Mesh...

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

作者： Qin Xin Fredrik Manne Yan Zhang Jianping Wang Zeyu Zheng Simula Research Laboratory Oslo Norway Department of Informatics University of Bergen Bergen Norway Department of Computer Science City University of Hong Kong Hong Kong China

Wireless Mesh Network (WMN) is an emerging communication paradigm to enable resilient, cost-efficient and reliable services for the future-generation wireless networks. In this paper, we study the problem of multipoint-to-multipoint (M2M) multicasting in a WMN which aims to use the minimum number of time slots to exchange messages among a group of k mesh nodes in a multi-hop WMN with n mesh nodes. We study the M2M multicasting problem in a distributed environment where each participant only knows that there are k participants and it does not know who are other k -1 participants among n mesh nodes. It is known that the computation of an optimal M2M multicasting schedule is NP-hard. We present a fully distributed deterministic algorithm for such an M2M multicasting problem and analyze its time complexity. We show that if the maximum hop distance between any two out of the k participants is d, then the studied M2M multicasting problem can be solved in time O(d log 2 n+k log 3 n/log k) with a polynomial-time computation, which is an almost optimal scheme due to the lower bound Omega(d+ k log n/log k) given in [5]. Our algorithm also improves the currently best known result with running time O(d log 2 n + k log 4 n) in [13]. In this paper, we also propose a distributed deterministic algorithm which accomplishes the M2M multicasting in time O(d+k) with a polynomial-time computation in unit disk graphs. This is an asymptotically optimal algorithm in the sense that there exists a WMN topology, e.g., a line, a ring, a star or a complete graph, in which the M2M multicasting cannot be completed in less than Omega(d+k) units of time.

关键词： Wireless mesh networks Multicast algorithms Broadcasting Mesh networks Network topology Telecommunication network reliability Polynomials distributed computing Routing Spread spectrum communication

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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...

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

作者： Junfang Wang Kan Cai Dharma R. Agrawal Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA Department of Computer Science University of British Columbia Vancouver BC Canada

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： Wireless mesh networks Relays Telecommunication traffic Internet Computer science Traffic control Linear programming Heuristic algorithms Interchannel interference Mesh networks

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A Dynamic Clustering Routing Algorithm Based on Support Degree for Wireless sensor Networks

A Dynamic Clustering Routing Algorithm Based on Support Degr...

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2009 ieee international conference on Intelligent computing and Intelligent systems(ICIS2009)

作者： Jing Yang 1,2,Baoguo Xu 1,Lu Hong 3,Zhuqing Jiao 1 1 Schoolof Communication and Control Engineering,Jiangnan University,Wuxi,China 2 Electrical Engineering College,Guizhou University,Guiyang,China 3 Department of Electronic Engineering,Huaihai Institute of Technology,Lianyungang,China

For monitoring burst events in a kind of reactive wireless sensor networks (WSNs),a novel scheme of dynamic clustering routing algorithm (DCRA) based on support degree is *** new approach lets sensors decide whether become a clusterhead (CH) according to the support degree coming from *** traditional distributed clustering algorithms,DCRA combines energy,load balancing and topology information together by defining an objective function based on support ***,the clusterhead aggregates data and transmits the result to base station (sink node) along multiple *** new algorithm is completely distributed and *** results show that DCRA has great potential in efficiently distributing energy consumption and extending the network lifetime.

关键词： wireless sensor networks (WSNs) clustering support degree routing network lifetime

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Dynamic control of a moving platform using the CAREN system to optimize walking invirtual reality environments

Dynamic control of a moving platform using the CAREN system ...

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Annual international conference of the ieee Engineering in Medicine and Biology Society (EMBC)

作者： Hassan El Makssoud Carol L. Richards Francois Comeau CIHR Multidisciplinary Team Laval University Canada CIHR Multidisciplinary Team in Locomotor Rehabilitation Department of Rehabilitation Laval University and Director of the Centre for Interdisciplinary Research in Rehabilitation and Social Integration (CIRRIS) Québec Canada

Virtual reality (VR) technology offers the opportunity to expose patients to complex physical environments without physical danger and thus provides a wide range of opportunities for locomotor training or the study of human postural and walking behavior. A VR-based locomotor training system has been developed for gait rehabilitation post-stroke. A clinical study has shown that persons after stroke are able to adapt and benefit from this novel system wherein they walk into virtual environments (VEs) on a self-paced treadmill mounted on a platform with 6 degrees of freedom. This platform is programmed to mimic changes in the terrain encountered in the VEs. While engaging in these VEs, excessive trunk movements and speed alterations have been observed, especially during the pitch perturbations accompanying uphill or downhill terrain changes. An in-depth study of the subject's behavior in relation to the platform movements revealed that the platform rotational axes need to be modified, as previously shown by Barton et al, and in addition did not consider the subject's position on the treadmill. The aim of this study was to determine an optimal solution to simulate walking in real life when engaging in VEs.

关键词： Control systems Legged locomotion Virtual reality distributed computing Virtual environment USA Councils Application software sensor systems Thorax Leg

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A Novel Electrical Resistance Tomography System of Carbon Fiber Smart Layer for Structural Health Monitoring

A Novel Electrical Resistance Tomography System of Carbon Fi...

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2009 ieee international conference on Intelligent computing and Intelligent systems(ICIS2009)

作者： Xiaoyu Zhang,Zhuoqiu Li,Sirong Zhu Department of Engineering Structure and Mechanics,School of Science,Wuhan University of Technology,Wuhan,China

Based on the function character and conductivity of carbon fiber smart layer(CFSL),A novel electrical resistance tomography (ERT) system of CFSL had been developed for whole field structural health monitoring (SHM). The apposite Tikhonov regularization principle and modified Newton-Raphson(MNR) algorithm were adopted to solve the ERT inverse problem. Its effectiveness was evaluated using virtual experimental. The resistivity distribution image of CFSL sensor had been obtained from the ERT system,which data came form the virtual experimental. The result showed that the electrical resistivity of CFSL sensor increases under tension. Its high-resistivity area was distributed in the high stress/strain area of the structure. Its resistivity distribution indicated structural stress/strain condition. It is feasibility to whole field SHM using the function character of smart layer and ERT technology.

关键词： electrical resistance tomography carbon fiber smart layer Image Reconstruction structural health monitoring

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Energy efficient clustering and routing scheme for Wireless sensor Networks

Energy efficient clustering and routing scheme for Wireless ...

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2009 ieee international conference on Intelligent computing and Intelligent systems(ICIS2009)

作者： Wenjun Liu City College,Wenzhou University Wenzhou,Zhejiang,325035,P.R.China Jiguo Yu School of Computer Science,Qufu Normal University Ri-zhao,Shandong,276826,P.R.China

Minimizing energy dissipation and maximizing net-work lifetime are among the central concerns when designing applications and protocols for wireless sensor *** this paper we propose an energy-efficient clustering and routing scheme for wireless sensor networks (EECR).It mainly includes distributed nodes clustering,dynamic cluster head rotation and inter-cluster routing *** clustering stage,we introduce an uneven clustering *** heads (CHs) which are closer to the base station (BS) have smaller cluster size than those farther from BS,thus they can preserve some energy for the purpose of inter-cluster data *** the dynamic cluster head rotation mechanism,the sensor nodes perform cluster head function in turn which balances energy consumption well among *** is more,we propose an energy-efficient multi-hop routing protocol executed by BS for inter-cluster *** strategy is making the most of BS's energy,so the node energy in the network is saved *** results show that EECR clearly prolongs the network lifetime over some related routing protocols.

关键词： net Energy efficient clustering and routing scheme for Wireless sensor Networks sensor

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