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SDIP3: structured and dynamic information push and pull protocols for distributed sensor networks 07

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Proceedings of the 3rd ieee international conference on distributed computing in sensor systems

作者： Ying Zhang Qingfeng Huang Palo Alto Research Center Inc. Palo Alto CA

ISBN: (纸本)9783540730897

We propose and study a class of structured and dynamic information push and pull protocols for wireless sensor networks. For structured information dissemination, our study focuses on the impact of various information demand characteristics on dissemination along some type of backbone structures. Our exploration of dynamic information push and pull focuses on finding optimal strategies in a distributed manner without prior knowledge of information demand characteristics and/or with heterogeneous query distributions. Our theoretical analysis uses a simple grid structure, but the protocol is applicable to arbitrary network topologies. A distributed traffic information system is used as the context of study and the simulation study uses a microscopic traffic simulator to demonstrate some of the ideas discussed in the paper.

关键词： distributed algorithms for collaborative information processing communication and processing primitives

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distributed facility location algorithms for flexible configuration of wireless sensor networks 07

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Proceedings of the 3rd ieee international conference on distributed computing in sensor systems

作者： Christian Frank Kay Römer Department of Computer Science ETH Zurich Switzerland

ISBN: (纸本)9783540730897

Many self-configuration problems that occur in sensor networks, such as clustering or operator placement for in-network data aggregation, can be modeled as facility location problems. Unfortunately, existing distributed facility location algorithms are hardly applicable to multi-hop sensor networks. Based on an existing centralized algorithm, we therefore devise equivalent distributed versions which, to our knowledge, represent the first distributed approximations of the facility location problem that can be practicably implemented in multihop sensor networks with local communication. Through simulation studies, we demonstrate that, for typical instances derived from sensor-network configuration problems, the algorithms terminate in only few communication rounds, the runtime does not increase with the network size, and, finally, that our implementation requires only local communication confined to small network neighborhoods. In addition, we propose simple extensions to our algorithms to support dynamic networks with varying link qualities and node additions and deletions. Using link quality traces collected from a real sensor network deployment, we demonstrate the effectiveness of our algorithms in realistic multi-hop sensor networks.

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sensor Relevance Establishment Problem in SharedInformation Gathering sensor Networks

Sensor Relevance Establishment Problem in SharedInformation ...

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ieee international conference on Networking, Sensing and Control

作者： Tauseef Gulrez Manolya Kavakli Interactive Systems and Virtual Reality Research Group Department of Computing and Division of ICS Macquarie University Sydney NSW Australia

In a city area network hundreds of video cameras, infrared and laser sensors are deployed for online monitoring of physical phenomenon over a geographical area. This is a popular application of sensor networks. Next generation intelligent sensing systems and networks are divided into two categories, an always-on mode -where every sensor information is piped to a base station (for resolution of a problem), and a snapshot mode -where a user queries the network for an instantaneous summary of the observed environment. Snapshot mode sensor networks are highly dependent on relevant sensing due to the accuracy required in a short time and the sensitive nature of the problem (query). This paper summarises the sensor relevance establishment problem in data acquisition. We describe its use in a framework that models the observed environment at each sensor node as a function of time, and uses an adaptive learning method to sample data with the corresponding relevance metric. We take the sensor network towards the problem by considering the relevance metric at given time step. The sensor relevance establishment problem has been split into two steps. In step one, the relevant sensor type is discovered based upon the ieee 1451.4 Transducers Electronic Data Sheets (TEDS). TEDS description model can be used to discover the sensor type and their geographical locations and other important information such as uncertainty measurement functions and information fusion rules necessary to fuse multi-sensor data. In step two, the most useful sensor selection is determined using the relevant information data metric. This step is modelled using the Kullback-Leibler Divergence (KLD) method to measure the information relevance distance between the TEDS modelled relevant sensors determined in step one. As proof of our concept we have simulated the 3D environment using a real-time distributed robotics software Player/Stage/Gazebo. The preliminary results have been demonstrated on a simple autono

关键词： Intelligent sensors sensor phenomena and characterization Infrared sensors Robot sensing systems Cities and towns Video sharing Cameras Infrared surveillance Laser modes Laser theory

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Multi-agent platform for fault tolerant control systems

Multi-agent platform for fault tolerant control systems

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ieee international conference on systems, Man and Cybernetics

作者： Mario J.G.C. Mendes Bruno M.S. Santos Jose Sa da Costa Department of Mechanical Engineering IDMEC/ISEL-Instituto Superior de Engenharia de Lisboa Polytechnic Institute of Lisbon Lisboa Portugal Dept. of Mechanical Engineering Polytechnic Institute of Lisbon Lisboa Portugal Department of Mechanical Engineering GCAR/IDMECInstituto Superior Técnico Technical University of Lisbon Lisboa Portugal Technical University of Lisbon Instituto Superior T??cnico Dept. of Mechanical Engineering GCAR/IDMEC Av. Rovisco Pais 1049-001 Lisboa Portugal

This paper proposes a new multi-agent platform for Fault Tolerant Control (FTC) systems. Several multi-agent platforms exist to deal with different problems but none of them to deal with control systems tolerant to faults using the Matlab/Simulink reg environment, which is in our days the scientific bench to this kind of research. When dealing with large-scale complex networked control systems (NCS), designing FTC systems is a very difficult task due to the large number of sensors and actuators spatially distributed and network connected. To solve this issue, the FTC platform presented in this paper uses simple and verifiable principles coming mainly from a decentralized design based on causal modelling partitioning of the NCS and distributed computing using multi- agent systems paradigm, allowing the use of agents with well established FTC methodologies or new ones developed taking into account the NCS specificities.

关键词： Fault tolerant systems Control systems Communication system control Automatic control Networked control systems sensor systems Actuators Multiagent systems Collaboration Electrical equipment industry

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Optimizing Security Computation Cost for Mobile Agent Platforms

Optimizing Security Computation Cost for Mobile Agent Platfo...

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ieee international conference on Industrial Informatics (INDIN)

作者： Najmus Saqib Malik Albert Treytl Institute of Computer Technology Technical University of of Vienna Vienna Austria Research Unit of Integrated Sensor Systems Austrian Academy of Sciences Wien Austria

This paper focuses on the optimization of computation cost for agent platform, which appears due to complex security operations. Traditionally, a security manager is integrated within an agent platform, which performs these operations for every mobile agent visiting the platform. To reduce the security costs at the agent platform, a detached security manager is used, which performs complex security operations on behalf of multiple agent platforms. The detached security manager is a security controlling authority for a set of agent platforms. It provides load balancing of mobile agents and enables quick agent migration between platforms. A variation of the detached security manager is a distributed security manager which provides fault tolerant and reliability in terms of a security process. A comparison of these variations of security concludes that the gained merits - savings in efficiency and performance -depend very much upon the requirements of the system which adopt it.

关键词： Cost function Computational efficiency Mobile agents Data security Fault tolerance Information security Network servers Displays Degradation distributed computing

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Knowledge Connectivity vs. Synchrony Requirements for Fault-Tolerant Agreement in Unknown Networks

Knowledge Connectivity vs. Synchrony Requirements for Fault-...

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Annual ieee/IFIP international conference on Dependable systems and Networks

作者： Fabiola Greve Sebastien Tixeuil Computer Science Department Federal University of Bahia (UFBA) Brasil

ISBN: (纸本)9781424430826

In self-organizing systems, such as mobile ad-hoc and peer-to-peer networks, consensus is a fundamental building block to solve agreement problems. It contributes to coordinate actions of nodes distributed in an ad-hoc manner in order to take consistent decisions. It is well known that in classical environments, in which entities behave asynchronously and where identities are known, consensus cannot be solved in the presence of even one process crash. It appears that self-organizing systems are even less favorable because the set and identity of participants are not known. We define necessary and sufficient conditions under which fault-tolerant consensus become solvable in these environments. Those conditions are related to the synchrony requirements of the environment, as well as the connectivity of the knowledge graph constructed by the nodes in order to communicate with their peers.

关键词： Fault tolerance Detectors Peer to peer computing Computer crashes Wireless sensor networks Ad hoc networks Protocols Network topology Computer science Sufficient conditions

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Leveraging redundancy in sampling-interpolation applications for sensor networks 07

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Proceedings of the 3rd ieee international conference on distributed computing in sensor systems

作者： Periklis Liaskovits Curt Schurgers University of California San Diego Electrical and Computer Engineering Department

ISBN: (纸本)9783540730897

An important class of sensor network applications aims at estimating the spatiotemporal behavior of a physical phenomenon, such as temperature variations over an area of interest. These networks thereby essentially act as a distributed sampling system. However, unlike in the event detection class of sensor networks, the notion of sensing range is largely meaningless in this case. As a result, existing techniques to exploit sensing redundancy for event detection, which rely on the existence of such sensing range, become unusable. Instead, this paper presents a new method to exploit redundancy for the sampling class of applications, which adaptively selects the smallest set of reporting sensors to act as sampling points. By projecting the sensor space onto an equivalent Hilbert space, this method ensures sufficiently accurate sampling and interpolation, without a priori knowledge of the statistical structure of the physical process. Results are presented using synthetic sensor data and show significant reductions in the number of active sensors.

关键词： sensor networks hilbert space energy efficiency sensing topology management sampling sensor selection spatial monitoring

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Energy-efficient data acquisition using a distributed and self-organizing scheduling algorithm for wireless sensor networks 07

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Proceedings of the 3rd ieee international conference on distributed computing in sensor systems

作者： Supriyo Chatterjea Tim Nieberg Yang Zhang Paul Havinga Department of Computer Science University of Twente Enschede The Netherlands Research Institute for Discrete Mathematics University of Bonn Bonn Germany

ISBN: (纸本)9783540730897

Wireless sensor networks are often densely deployed for environmental monitoring applications. Collecting raw data from these networks can lead to excessive energy consumption. Thus using the spatial and temporal correlations that exist between adjacent nodes we appoint a few as representative nodes that perform in-network aggregation. This reduces the total number of transmissions. Our distributed scheduling algorithm autonomously assigns a particular node to perform aggregation and reassigns schedules when network topology changes. These topology changes are detected using cross-layer information from the underlying MAC layer. We also present theoretical performance estimates and upper bounds of our algorithm and evaluate it by implementing the algorithm on actual sensor nodes, demonstrating an energy-saving of up to 80% compared to raw data collection.

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Network-centric Middleware for Service Oriented Architectures across Heterogeneous Embedded systems

Network-centric Middleware for Service Oriented Architecture...

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international Workshop on Enterprise distributed Object computing, EDOCW

作者： Andreas Wolff Stefan Michaelis Jens Schmutzler Christian Wietfeld Communication Networks Institute University of Dortmund Dortmund Germany

The increasing ubiquity of mobile embedded systems has been matched by the evolution of a variety of wireless network standards and technologies. The major constraints of wireless embedded systems are limitations of communication bandwidth, processing capabilities, and battery power. Remote wireless embedded systems often act as sensors, which provide data to a certain community. The exchange of data is nowadays usually realized through Web services. For standard Web services an XML parser is required, which demands a lot of processing power whereas embedded devices with their resource constraints provide only limited processing capabilities. Another drawback of standard Web services is the huge communication overhead due to the use of human readable XML. On the other hand using standard Web service technology enables service developers to easily integrate new embedded devices to their network or to the Internet. This paper reports on the on-going work of the key European research project MORE, which brings the embedded system world together with the Web services world. MORE introduces a new connector concept easing the handling of heterogeneous communication channels and muSOA for reducing the message size and processing demands for parsing XML messages.

关键词： Middleware Service oriented architecture Embedded system Web services XML Wireless sensor networks Mobile communication Bandwidth Batteries sensor systems

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Mobile anchor-free localization for wireless sensor networks 07

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Proceedings of the 3rd ieee international conference on distributed computing in sensor systems

作者： Yurong Xu Yi Ouyang Zhengyi Le James Ford Fillia Makedon DevLab Computer Science Department Dartmouth College and Heracleia Lab Univ. of Texas at Arlington

ISBN: (纸本)9783540730897

In this paper, we consider how to localize individual nodes in a wireless sensor network when some subset of the network nodes can be in motion at any given time. For situations in which it is not practical or cost-efficient to use GPS or anchor nodes, this paper proposes an Anchor-Free Mobile Geographic distributed Localization (MGDL) algorithm for wireless sensor networks. Taking advantage of the accelerometers that are present in standard motes, MGDL estimates the distance moved by each node. If this distance is beyond a threshold, then this node will trigger a series of mobile localization procedures to recalculate and update its location in the node itself. Such procedures will be stopped when the node stops moving. Data collected using Tmote Invent nodes (Moteiv Inc.) and simulations show that the proposed detection method can efficiently detect the movement, and that the localization is accurate and the communication is efficient in different static and mobile contexts.

关键词： wireless sensor networks mobility localization

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