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检索条件"任意字段=First IEEE International Conference on Distributed Computing in Sensor Systems, DCOSS 2005"

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Landscape: a high performance distributed positioning scheme for outdoor sensor networks

Landscape: a high performance distributed positioning scheme...

引用

ieee international conference on Wireless and Mobile computing, Networking And Communications (WiMob)

作者： Liqiang Zhang Qiang Cheng Yingge Wang S. Zeadally

In this work, we consider the sensor localization problem from a novel perspective by treating it as a functional dual of target tracking. In traditional tracking problems, static location-aware sensors track and predict the position/speed of a moving target. As a dual, we utilize a moving location-assistant (LA) (with global positioning system (GPS) or pre-defined moving path) to help location-unaware sensors to accurately discover their positions. We call our proposed system Landscape. In Landscape, an LA (an aircraft, for example) periodically broadcasts its current location while it moves around or through a sensor field. Each sensor collects the location beacons, measures the distance between itself and the LA based on received signal strength (RSS), and individually calculates their locations via an unscented Kalman filter (UKF) based algorithm. Our contributions are at least twofold. (1) Landscape is a distributed scheme, it does not rely on measured distances among neighbors (as used by most current proposals), which makes it robust to topology and density; Landscape involves zero sensor-to-sensor communication overhead, and is highly scalable to network size. (2) By introducing UKF in sensor localization problem, we reap multiple benefits: our UKF-based algorithm nicely exploits the constraints increasingly added by the beacons; it elegantly solves the nonlinear problem with low computation cost and complexity; and most importantly, it efficiently reduces the effects of measurement errors, making Landscape robust to ranging errors. Extensive simulations and evaluations against the state-of-the-art systems show that Landscape is a high-performance sensor positioning scheme for outdoor sensor networks.

关键词： Target tracking sensor systems Robustness Global Positioning System Aircraft Broadcasting Density measurement Current measurement Size measurement Proposals

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Hard Real Time Communication Using the CANIOP Protocol

Hard Real Time Communication Using the CANIOP Protocol

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ieee Region 10 international conference TENCON

作者： Tarek Guesmi Salem Hasnaoui Laboratoire SYSCOM Ecole Nationale ďIngénieurs de Tunis (ENIT) Tunis Tunisia

distributed computer control in complex embedded systems oversees diverse electronic control units connecting hundreds or thousands of analogue and digital sensors and actuators. These systems are also called today sensors networks. In an emrging class of open distributed real time and embedded (DRE) systems with stringent but dynamic QoS requirements, there is a need to propagate QoS parameters and enforce task QoS requirements across multiple endsystems in a way that is simultaneously efficient and adaptable. Consequently, this paper presents an inter-ORB protocol, which makes efficient use of the advantages of controller area network (CAN) and maps the CAN priorities to a band of CORBA priorities. Our definition of this protocol is bound closely to the features of RT-CORBA, the OMG data acquisition from industrial systems(DAIS) RFP and the CAN bus, well known as a real-time underlying network . We give the criteria of the definition of the priority field and show how prioritization of messages over the physical CAN network can be achieved, when adopting the use of RT-CORBA scheduling service which implements a dynamic scheduling policy.

关键词： Protocols Communication system control Control systems sensor systems Real time systems Dynamic scheduling Analog computers distributed computing Embedded computing distributed control

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Content-Based Publish-Subscribe over Structured Overlay Networks

Content-Based Publish-Subscribe over Structured Overlay Netw...

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international conference on distributed computing systems

作者： R. Baldoni C. Marchetti A. Virgillito R. Vitenberg Dipartimento di Informatica e Sistemistica Università di Roma La Sapienza Italy IBM Research Haifa Israel

This paper introduces a novel architecture for implementing content-based pub/sub communications on top of structured overlay networks. This architecture overcomes some well-known limitations of existing infrastructures, i.e. lack of self-configuration and of adaptiveness to dynamic changes. This is achieved by devising a mediator stratum between the rich event subscription semantics of content-based pub/sub systems and the standard logical addressing scheme of overlays. The paper describes details of the design and provides considerations in selecting the subscription-to-node and event-to-node mappings suitable for the solution. We identify the lack of native support for one-to-many communication by overlay networks as the main impediment for efficient system operation. The paper introduces a novel primitive for one-to-many message delivery, showing through simulation how this can improve performance of the architecture. The simulation study also shows performance comparison between the different mappings proposed as well as evaluation of other optimizations discussed in the paper

关键词： Publish-subscribe Subscriptions Routing Unicast Scalability Impedance sensor phenomena and characterization sensor systems and applications Computer architecture Content management

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Adaptive Carrier Sensing and Packet Sending - An Alternative to Boost the Performance in Directional Communications

Adaptive Carrier Sensing and Packet Sending - An Alternative...

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ieee international conference on Parallel and distributed computing, Applications and Technologies (PDCAT)

作者： J.L. Bordim T. Hunziker K. Nakano Department of Computer Science University of Brasilia Brasilia Brazil Department of Wireless Communication Systems ATR Kansai Science Kyoto Japan Department of Artificial Complex Systems Engineering School of Engineering Hiroshima University Higashi Hiroshima Japan

Despite the efforts to leverage the network performance through the use of Directional Communications, most protocols still rely on the basic mechanisms employed by the ieee802.11 standards. While this might be desirable to facilitate compatibility, nodes empowered with directional antennas should be able to explore the benefits of directional communications whenever possible. With that in mind, we propose two mechanisms, termed Adaptive Carrier Sensing and Adaptive Packet Sending, aiming to allow nodes equipped with directional antennas to exploit the advantages of such systems to improve network performance.

关键词： Directional antennas Ad hoc networks Throughput Media Access Protocol Computer science Wireless communication Cities and towns systems engineering and theory Wireless sensor networks Relays

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An Efficient Topology Maintenance Algorithm Based on Shortest Path Tree for Wireless sensor Networks

An Efficient Topology Maintenance Algorithm Based on Shortes...

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ieee international conference on Parallel and distributed computing, Applications and Technologies (PDCAT)

作者： Zhong Shen Yilin Chang Xin Zhang Can Cui National Key Laboratory of Integrated Service Network Xidian University China

The topology of a wireless sensor network has a significant effect on the network performance. Although topology control algorithms can optimize the network topology, the resultant topology is usually changeable. In this paper, we focus on how to maintain the network connectivity while reducing the maintenance overhead as some nodes fail. A distributed topology maintenance algorithm based on the shortest path tree is proposed. In this algorithm, nodes in immediate surroundings of a faulty node are first triggered to respond, and if they couldn’t ensure that the network is connected, the other related nodes are further triggered. Simulation results show that the proposed scheme can efficiently maintain the network connectivity with significant reduction in the overhead for topology maintenance.

关键词： Network topology Wireless sensor networks sensor phenomena and characterization Communication system control Resonance light scattering Relays Intserv networks Monitoring Ad hoc networks Energy consumption

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Cellular automata for distributed computing: models of agent interaction and their implications

Cellular automata for distributed computing: models of agent...

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ieee international conference on systems, Man and Cybernetics

作者： P.T. Tosic Open Systems Laboratory Department of Computer Science University of Illinois Urbana-Champaign USA

We propose cellular automata (CA) based models as a useful mathematical idealization for modeling large-scale distributed computing in general, and large-scale multi-agent systems (MAS), in particular. The classical CA need to be modified in several important respects, in order to become an appropriate abstraction for a broad class of large-scale MAS made of autonomous reactive agents. We argue that thus generalized CA can capture many important MAS properties at the level of agent ensembles and their long-term global behavior patterns. In this paper, we focus on the issue of inter-agent communication in CA. We propose sequential CA as the first step towards the genuinely asynchronous CA as the ultimate CA-based abstraction for MAS insofar as the model of inter-agent communication is concerned. We then compare and contrast certain configuration space properties of simple threshold sequential CA with the corresponding properties of parallel, perfectly synchronous simple threshold CA. Specifically, we show that the possibility of "looping" in parallel threshold CA is solely due to the unrealistic assumption of perfect inter-agent communication synchrony.

关键词： distributed computing Large-scale systems Multiagent systems Mathematical model Automata Artificial intelligence Open systems Laboratories Computer science

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Implementation and evaluation of the personal wellness coach

Implementation and evaluation of the personal wellness coach

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international conference on distributed computing systems Workshop

作者： R. Asselin G. Ortiz J. Pui A. Smailagic C. Kissling Carnegie Mellon University USA Technische Universität München Germany

This paper describes the design and evaluation of a wearable personal wellness coach system that supports a range of activities including health data collection, interpretation, feedback and self-monitoring. We implemented a wearable computing platform consisting of an array of sensors and application software to motivate users to reach fitness goals and prevent harm in a real-time environment. Evaluation and testing were done on 65 users in four groups: students, health club members, ROTC members and baby boomer-age individuals. Comparing the personal wellness coach against an existing exercise product, our results indicate that this system is an effective tool that is less intrusive and in some cases can perform like a personal trainer and help improve user efficiency.

关键词： Heart rate Biomedical monitoring sensor arrays Wearable computers Testing Shape Real time systems State feedback Heart rate detection Computer architecture

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A self configurable topology-aware network for smart materials

A self configurable topology-aware network for smart materia...

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international conference on distributed computing systems Workshop

作者： T. Yanagihara H. Sakakibara R. Ohsawa M. Ideuchi N. Kohtake I. Masayuki K. Takashio H. Tokuda Keio Research Institute Keio University Fujisawa Kanagawa Japan Faculty of Environmental Information Keio University Fujisawa Kanagawa Japan Graduate School of Media and Governance Keio University Fujisawa Kanagawa Japan

In this paper, we present an architecture to create extemporaneous networking on u-Texture. u-Texture is a tile shaped smart material which can be used to construct smart furnitures. Each u-Texture reacts according to what the entire smart furniture is shaped like. This reaction greatly affects the networking within a u-Texture. We therefore must allow dynamic arrangements within the network when a u-Texture is detached from or attached to another smart furniture. We present our tactics to implement such an self configurable topology-aware network to support applications executed on the entire smart furniture.

关键词： Infrared sensors Wireless sensor networks Tactile sensors Computer displays Acceleration Tiles Application software Intelligent sensors Wireless communication Embedded computing

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Detecting Malicious Beacon Nodes for Secure Location Discovery in Wireless sensor Networks

Detecting Malicious Beacon Nodes for Secure Location Discove...

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international conference on distributed computing systems

作者： Donggang Liu Peng Ning Wenliang Du North Carolina State University USA Syracuse University USA

sensors' locations play a critical role in many sensor network applications. A number of techniques have been proposed recently to discover the locations of regular sensors based on a few special nodes called beacon nodes, which are assumed to know their locations (e.g., through GPS receivers or manual configuration). However, none of these techniques can work properly when there are malicious attacks, especially when some of the beacon nodes are compromised. This paper introduces a suite of techniques to detect and remove compromised beacon nodes that supply misleading location information to the regular sensors, aiming at providing secure location discovery services in wireless sensor networks. These techniques start with a simple but effective method to detect malicious beacon signals. To identify malicious beacon nodes and avoid false detection, this paper also presents several techniques to detect replayed beacon signals. This paper then proposes a method to reason about the suspiciousness of each beacon node at the base station based on the detection results collected from beacon nodes, and then revoke malicious beacon nodes accordingly. Finally, this paper provides detailed analysis and simulation to evaluate the proposed techniques. The results show that our techniques are practical and effective in detecting malicious beacon nodes

关键词： Intelligent networks Wireless sensor networks Global Positioning System Protocols Signal detection Target tracking Routing Manuals Signal processing Base stations

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A Hybrid Wireless Network Approach to Support QoS Data Transmission

A Hybrid Wireless Network Approach to Support QoS Data Trans...

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international conference on Parallel and distributed systems (ICPADS)

作者： Ying-Hong Wang Hung-Jen Mao Chih-Hsiao Tsai Jeang-You Lai Department of Computer Science and Information Engineering Tamkang University Taipei Taiwan

Wireless sensor networks are emerging as a popular research issue and tool for many applications. However, nodes in a sensor network are severely constrained by energy, storage capacity and computing power. In this paper, we propose an integrated network environment (sensor and ad hoc network) with ieee 802.15.4a, ultra-wideband (UWB) and two-tier data dissemination (TTDD) routing protocol. We wish that sensor network could support fast dynamic location-tracking, information gathering and response. And base station use theses information to compute an optimal path for ad hoc mobile devices to offer good QoS level and reliable data transmission according to different requests

关键词： Wireless networks Data communication Wireless sensor networks Capacitive sensors Energy storage Computer networks Ad hoc networks Ultra wideband technology Routing protocols Base stations

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