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

共 1159 条记录，以下是241-250 订阅

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State-Action Based Link Layer Design for ieee 802.11b Compliant MATLAB-Based SDR

State-Action Based Link Layer Design for IEEE 802.11b Compli...

引用

international conference on distributed computing in sensor systems (dcoss)

作者： Ramanathan Subramanian Eric Doyle Benjamin Drozdenko Miriam Leeser Kaushik R. Chowdhury HeartSine Technologies Ltd. Belfast U.K. Institute for Electronics Engineering University of Erlangen-Nuremberg Erlangen Germany Exploristics Ltd. Belfast U.K. Ulster University Newtownabbey U.K.

ISBN: (纸本)9781509014613

Software defined radio (SDR) allows unprecedented levels of flexibility by transitioning the radio communication system from a rigid hardware platform to a more user-controlled software paradigm. However, it can still be time consuming to design and implement such SDRs as they typically require thorough knowledge of the operating environment and a careful tuning of the program. In this work, we describe a systems contribution and outline strategies on how to create a state-action based design in implementing the CSMA/CA/ACK MAC layer in MATLAB ® that runs on the USRP ® platform, a commonly used SDR. Our design allows optimal selection of the parameters so that all operations remain functionally compliant with the ieee 802.11b standard (1Mbps specification). The code base of the system is enabled through the Communications System Toolbox TM and incorporates channel sensing and exponential random back-off for contention resolution. The current work provides a testbed to experiment with and enables creation of new MAC protocols starting from the fundamental ieee 802.11b compliant standard. Our system design approach guarantees the consistent performance of the bi-directional link and we include the experimental results for the three node system to demonstrate the robustness of the MAC layer in mitigating packet collisions and enforcing fairness among nodes.

关键词： MATLAB Media Access Protocol Hardware Wireless communication Receivers Standards

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Defense Strategies for Infrastructures with Multiple systems of Components 19

Defense Strategies for Infrastructures with Multiple Systems...

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19th international conference on Information Fusion (FUSION)

作者： Rao, Nageswara S. V. Ma, Chris Y. T. Hausken, Kjell He, Fei Zhuang, Jun Oak Ridge Natl Lab Oak Ridge TN 37831 USA Adv Digital Sci Ctr Singapore Singapore Univ Stavanger Stavanger Norway Texas A&M Univ College Stn TX 77843 USA SUNY Buffalo Buffalo NY 14226 USA

ISBN: (纸本)9780996452748

In several critical infrastructures correlations between the constituent systems represent certain vulnerabilities: disruptions to one may propagate to others and possibly to the entire infrastructure. The correlations between the systems are characterized in two ways in this paper: (i) the aggregate failure correlation function specifies the conditional failure probability of the infrastructure given the failure of an individual system, and (ii) the pairwise correlation function between two systems specifies the failure probability of one system given the failure of the other. The survival probabilities of individual systems satisfy first-order differential conditions that generalize the contest success functions and statistical independence conditions. We formulate a problem of ensuring the resilience of an infrastructure as a game between the provider and attacker;their utility functions are sums of infrastructure survival probability terms and cost terms, both expressed in terms of the numbers of system components attacked and reinforced. We derive Nash Equilibrium conditions and sensitivity functions that highlight the dependence of infrastructure resilience on the cost terms, correlation functions, and individual system survival probabilities. We apply these results to models of distributed cloud computing and energy grid infrastructures.

关键词： distributed cloud

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distributed Randomized Kaczmarz and Applications to Seismic Imaging in sensor Network 11

Distributed Randomized Kaczmarz and Applications to Seismic ...

引用

ieee international conference on distributed computing in sensor systems dcoss

作者： Kamath, Goutham Ramanan, Paritosh Song, Wen-Zhan Georgia State Univ Dept Comp Sci Atlanta GA 30303 USA

ISBN: (纸本)9781479988563

Many real-world wireless sensor network applications such as environmental monitoring, structural health monitoring, and smart grid can be formulated as a least-squares problem. In distributed Cyber-Physical System (CPS), each sensor node observes partial phenomena due to spatial and temporal restriction and is able to form only partial rows of least-squares. Traditionally, these partial measurements were gathered at a centralized location. However, with the increase in sensors and their measurements, aggregation is becoming challenging and infeasible. In this paper, we propose distributed randomized kaczmarz that performs in-network computation to solve least-squares over the network by avoiding costly communication. As a case study, we present a volcano monitoring application on a distributed CORE emulator and use real data from Mt. St. Helens to evaluate our proposed method.

关键词： distributed computing Gossip Methods Least-squares Iterative Methods Mesh Network Randomized Kaczmarz

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An Efficient Agent Location Management for Wireless sensor Networks 11

An Efficient Agent Location Management for Wireless Sensor N...

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ieee international conference on distributed computing in sensor systems dcoss

作者： Fukuda, Hiroaki Leger, Paul Shibaura Inst Technol Informat Sci & Engn Tokyo Japan Univ Catolica Norte Escuela Ciencias Empresariales Antofagasta Region De Antof Chile

ISBN: (纸本)9781479988563

A Wireless sensor Network (WSN) is typically deployed on a place in which no electric source is provided, meaning that its battery consumption is crucial. Applications for WSNs require implementations of complex operations like network administration. To simplify the development of these applications, several mobile agent middlewares have been proposed (e.g., Agilla). Applications for these middlewares are executed by communications among agents;therefore, a common operation is to look up agents. Because existing proposals do not have much technical support for efficient approach to look up agents, every lookup consumes a significant amount of battery energy and time. In addition, current approaches can fail their lookup operations if the target agent moves during a lookup operation. This paper proposes CMSN, an efficient and effective lookup for mobile agent middlewares using distributed hash table. We evaluate and compare CMSN in terms of effective lookups and battery consumption.

关键词： distributed Hash Table Mobile Agent Efficient Lookup

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Enabling Design of Performance-Controlled sensor Network Applications Through Task Allocation and Reallocation 11

Enabling Design of Performance-Controlled Sensor Network App...

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ieee international conference on distributed computing in sensor systems dcoss

作者： Elsts, Atis Bijarbooneh, Farshid Hassani Jacobsson, Martin Sagonas, Konstantinos Uppsala Univ Dept Informat Technol Uppsala Sweden

ISBN: (纸本)9781479988563

Task Graph (ATaG) is a sensor network application development paradigm where the application is visually described by a graph where the nodes correspond to application-level tasks and edges correspond to dataflows. We extend ATaG with the option to add nonfunctional requirements: constraints on end-to-end delay and packet delivery rate. Setting up these constraints at the design phase naturally leads to enabling run-time assurance at the deployment phase, when the conditions of the constraints are used as network's performance goals. We provide both run-time middleware that checks the conditions of these constraints and a central management unit that dynamically adapts the system by doing task reallocation and putting task copies on redundant nodes. Through extensive simulations we show that the system is efficient enough to enable adaptations within tens of seconds even in large networks.

关键词： task allocation Runtime sensor networks network applications Constraint End-to-end delay design phases Enabling Ganglia task graphs

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Middleware for Internet of Things: a study 11

Middleware for Internet of Things: a study

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ieee international conference on distributed computing in sensor systems dcoss

作者： Fersi, Ghofrane Natl Sch Engineers Sfax Dept Comp Sci & Appl Math Lab Dev & Control Distributed Applicat ReDCAD BP 1173-3038 Sfax Tunisia

ISBN: (纸本)9781479988563

The significant progress in smart devices has lead to the shifting of actual Internet to the Internet of Things (IoT). Internet of Things is invading our real lives. In this new Internet vision, trillions of smart dynamic objects and areas will be connected to the Internet and interact between each others to achieve common applications. This new Internet vision requires suitable IoT infrastructure that offers the main Internet of Things functionalities to facilitate the development of IoT applications. Middleware is the software layer between technological and application layers. It is mainly used to afford common services and functions to applications and to abstract implementation details to ease more complex application development. In this paper, we review the main challenges facing Internet of Things middleware and survey the most well known middleware that have been proposed in this field.

关键词： Internet of Things middleware challenges interoperability heterogeneity

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Wireless sensor network-based urban traffic monitoring using inertial reference data 11

Wireless sensor network-based urban traffic monitoring using...

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ieee international conference on distributed computing in sensor systems dcoss

作者： Mousa, Mustafa Abdulaal, Mohammed Boyles, Stephen Claudel, Christian King Abdullah Univ Sci & Technol Thuwal 23955 Saudi Arabia Univ Manchester Manchester Lancs England Univ Texas Austin Austin TX 78712 USA

ISBN: (纸本)9781479988563

Probe vehicle data is currently generated using satellite navigation systems such as the GPS, GLONASS or Galileo systems. However, because of their high cost and relatively high position uncertainty and low sampling rate, satellite positioning systems have a relatively low penetration rate among users. In addition, such sensors do not provide context in the traffic measurements. To address these issues, we introduce a new traffic monitoring concept based on inexpensive inertial measurement units in conjunction with a wireless sensor network deployed inside a city. After discussing the sensing technique, we present a preliminary implementation of this system using an open source robotic platform. Preliminary results show that this system can be used to generate traffic measurement data.

关键词： Traffic monitoring GPS-denied environment dead reckoning trajectory reconstruction

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Joint Localization of Events and Sources in Social Networks 11

Joint Localization of Events and Sources in Social Networks

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ieee international conference on distributed computing in sensor systems dcoss

作者： Giridhar, Prasanna Wang, Shiguang Abdelzaher, Tarek George, Jemin Kaplan, Lance Ganti, Raghu Univ Illinois Dept Comp Sci Urbana IL 61801 USA Army Res Labs Adelphi MD 20783 USA IBM Res Yorktown Hts NY USA

ISBN: (纸本)9781479988563

Recent sensor network literature investigated the use of social networks as sensor networks, and formulated a physical event localization problem from social network data. This paper improves on the above results by formulating a joint localization problem of events and sources, leveraging the fact that sources on social networks often have a location affinity: They tend to comment more on events in their locations of interest. While social networks, such as Twitter, do not offer source location information for the majority of sources, we show that our algorithms for jointly inferring source and event location significantly improve localization quality by mutually enhancing location estimation of both events and sources. We evaluate the performance of our algorithm both in simulation and using Twitter data about current events. The results show that joint inference of source and event location allows us to localize many more of the events identified in real-world datasets.

关键词： sensor networks

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Optimal Power Management With Guaranteed Minimum Energy Utilization For Solar Energy Harvesting systems 11

Optimal Power Management With Guaranteed Minimum Energy Util...

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ieee international conference on distributed computing in sensor systems dcoss

作者： Buchli, Bernhard Kumar, Pratyush Thiele, Lothar ETH Comp Engn & Networks Lab Zurich Switzerland

ISBN: (纸本)9781479988563

In this work we present the first formal study on optimizing the energy utilization of energy harvesting embedded systems while giving bounds on the minimum energy usage. Furthermore, to deal with the uncertainty inherent to solar energy harvesting we propose to use (i) a finite horizon scheme, and (ii) a non-uniformly scaled energy estimation based on an astronomical model. Under certain realistic assumptions, the finite horizon scheme can provide guarantees on minimum energy utilization, and therefore minimum utility. We show that a single non-uniform scaling function is applicable to solar energy traces from diverse locations. We further propose and evaluate a piece-wise linear approximation for efficient implementation as a small look-up table for resource constrained embedded systems. With extensive experimental evaluation for eight publicly available datasets and two datasets collected with our own deployments, we quantitatively establish that the proposed solution is highly effective at providing a guaranteed minimum utilization, and significantly out-performs four previously proposed solutions.

关键词： Dynamic Power Management Energy Harvesting Performance Guarantee WSN energy harvesting Wireless sensor networks WSN gene energy utilisation Solar Energy Piecewise linear approximation Embedded systems

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Getting Virtualized Wireless sensor Networks' IaaS Ready for PaaS 11

Getting Virtualized Wireless Sensor Networks' IaaS Ready for...

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ieee international conference on distributed computing in sensor systems dcoss

作者： Khan, Imran Errounda, Fatima Zahra Yangui, Sami Glitho, Roch Crespi, Noel Telecom SudParis Inst Mines Telecom F-91011 Evry France Concordia Univ Dept CIISE Montreal PQ H3G 2W1 Canada

ISBN: (纸本)9781479988563

With the recent advances in sensor hardware and software, architectures for virtualized Wireless sensor Networks (vWSNs) are now emerging. Through node-and network-level virtualization, vWSNs can be offered as Infrastructure-as-a-Service (IaaS) which can aid in realizing the true potential of Internet-of-Things (IoT). Cloud computing offers elastic provisioning of large-scale infrastructures to multiple concurrent users where Platform-as-a-Service (PaaS) interacts with IaaS in order to efficiently host and execute applications over these infrastructures. Amalgamating IoT with cloud computing potentially allows rapid application and service provisioning in an efficient, scalable and robust manner. However, interactions between vWSNs and PaaS are largely an unexplored area. Indeed, existing vWSN IaaS are not yet ready for PaaS. This paper proposes a vWSN IaaS architecture which is ready for interactions with PaaS. The proposed architecture is based on our previous works and is rooted in the fundamental differences between traditional IaaS and vWSN IaaS. We built a prototype using Java Sunspot as the WSN tool kit and made early performance measurements.

关键词： Wireless sensor Networks Internet of Things Cloud computing Virtualization IaaS PaaS

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