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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1101-1110 订阅

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Explicit Combinatorial Structures for Cooperative distributed Algorithms

Explicit Combinatorial Structures for Cooperative Distribute...

引用

international conference on distributed computing systems

作者： D. Kowalski P.M. Musial A.A. Shvartsman Instytut Informatyki Uniwersytet Warszawski Warszawa Poland Department of Computer Science & Engineering University of Connecticut Storrs CT USA Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA USA

Cooperation in distributed settings often involves activities that must be performed at least once by the participating processors. When processor failures or delays occur, it becomes unavoidable that some tasks are done redundantly. To make efficient use of the available processors, several distributed algorithms schedule the activities of the processors in terms of permutations of tasks that need to be performed at least once. This paper presents the first explicit practical deterministic construction of sets of permutations with certain combinatorial properties that immediately make practical several deterministic distributed algorithms. These algorithms solve a variety of problems, for example, cooperation in shared-memory and message-passing settings, and the gossip problem. Prior to this work, the most efficient algorithms for some of these problems were primarily of theoretical interest - they relied on permutations that are known to exist, but very expensive to construct, with the cost of construction being at least exponential in the size of the permutations. In this paper, the explicitly constructed permutations are ultimately used directly to produce practical instances of several classes of efficient deterministic algorithms. Most importantly, for all of these algorithms, the schedule construction cost is reduced from exponential to polynomial, at the expense of slight detuning, at most polylogarithmic, of the efficiency of these algorithms

关键词： distributed algorithms distributed computing Processor scheduling Computer science Costs Scheduling algorithm Polynomials Delay Artificial intelligence Collaboration

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TinyLIME: bridging mobile and sensor networks through middleware

TinyLIME: bridging mobile and sensor networks through middle...

引用

ieee international conference on Pervasive computing and Communications (PerCom)

作者： C. Curino M. Giani M. Giorgetta A. Giusti A.L. Murphy G.P. Picco Dipartimento di Elettronica e Informazione Politecnico di Milano Italy Department of Informatics University of Lugano Switzerland

In the rapidly developing field of sensor networks, bridging the gap between the applications and the hardware presents a major challenge. Although middleware is one solution, it must be specialized to the qualities of sensor networks, especially energy consumption. The work presented here provides two contributions: a new operational setting for sensor networks and a middleware for easing software development in this setting. The operational setting we target removes the usual assumption of a central collection point for sensor data. Instead the sensors are sparsely distributed in an environment, not necessarily able to communicate among themselves, and a set of clients move through space accessing the data of sensors nearby, yielding a system which naturally provides context relevant information to client applications. We further assume the clients are wirelessly networked and share locally accessed data. This scenario is relevant, for example, when relief workers access the information in their zone and share this information with other workers. Our second contribution, the middleware itself is an extension of LlME, our earlier work on middleware for mobile ad hoc networks. The model makes sensor data available through a tuple space interface, providing the illusion of shared memory between applications and sensors. This paper presents both the model and the implementation of our middleware incorporated with the Crossbow Mote sensor platform.

关键词： Middleware Application software Hardware sensor systems and applications Mobile ad hoc networks Wireless sensor networks Military computing Routing Pervasive computing Informatics

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Exploiting user behaviour for context-aware power management

Exploiting user behaviour for context-aware power management

引用

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

作者： C. Harris V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

With more and more computing devices being deployed in buildings there has been a steady rise in buildings' electricity consumption. At the same time there is a pressing need to reduce overall building energy consumption. Pervasive computing could further exacerbate this problem but it could also provide a solution. Context information (e.g., user location) likely to be available in pervasive computing environments could enable highly effective device power management. The objective of such context-aware power management (CAPM) is to minimise the overall electricity consumption of a building while maintaining acceptable user-perceived device performance. To investigate the potential of CAPM we conducted experimental trials for two simple location-aware power management policies. Our results highlight the presence of two distinct user behaviour patterns but also show that location alone is not enough for effective power management. We therefore propose a CAPM framework that employs Bayesian networks to support prediction of user behaviour patterns from multi-modal sensor data for effective power management. We further propose the use of acoustic data as an interesting context for predicting finer-grained user behaviour. The paper presents an initial evaluation of the resulting framework.

关键词： Energy management Energy consumption Pervasive computing Power system management Computer network management Costs Pressing Bayesian methods Hard disks Battery management systems

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Job-Site Level Fault Tolerance for Cluster and Grid environments

Job-Site Level Fault Tolerance for Cluster and Grid environm...

引用

ieee international conference on Cluster computing

作者： Kshitij Limaye Box Leangsuksun Zeno Greenwood Stephen L. Scott Christian Engelmann Richard Libby Kasidit Chanchio Louisiana Tech University Ruston LA USA Oak Ridge National Laboratory Oak Ridge TN USA University of Reading Reading UK Enterprise Platforms Group Intel Corporation USA Thammasat University Thailand

In order to adopt high performance clusters and grid computing for mission critical applications, fault tolerance is a necessity. Common fault tolerance techniques in distributed systems are normally achieved with checkpoint-recovery and job replication on alternative resources, in cases of a system outage. The first approach depends on the system's MTTR while the latter approach depends on the availability of alternative sites to run replicas. There is a need for complementing these approaches by proactively handling failures at a job-site level, ensuring the system high availability with no loss of user submitted jobs. This paper discusses a novel fault tolerance technique that enables the job-site recovery in Beowulf cluster-based grid environments, whereas existing techniques give up a failed system by seeking alternative resources. Our results suggest sizable aggregate performance improvement during an implementation of our method in Globus-enabled HA-OSCAR. The technique called ''smart failover" provides a transparent and graceful recovery mechanism that saves job states in a local job-manager queue and transfers those states to the backup server periodically, and in critical system events. Thus whenever a failover occurs, the backup server is able to restart the jobs from their last saved state

关键词： Fault tolerance Grid computing Availability Fault tolerant systems Collaborative work distributed computing Scheduling Contracts Mission critical systems Aggregates

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Integrated sensing and processing for distributed sensor networks

Integrated sensing and processing for distributed sensor net...

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ieee international conference on Networking, Sensing and Control

作者： H.A. Schmitt D.E. Waagen C.O. Savage S. Bellofiore W. Moran Missile Systems Raytheon Company Tucson AZ USA University of Melbourne VIC Australia

Advances in sensor technologies, computation devices, and algorithms have created enormous opportunities for intelligent, automated threat identification, target acquisition, and surveillance. Unfortunately, as information requirements grow, conventional network processing techniques require ever increasing bandwidth between sensors and processors, as well as potentially exponentially complex data reduction methods. Practical approaches requires that the sensing and computation be jointly engineered, to raise the quality of data and classification, and minimize computation, power consumption, and cost.

关键词： Wireless sensor networks Intelligent sensors Missiles Acoustic sensors Monitoring Power engineering computing Processor scheduling Acoustic applications Surveillance Bandwidth

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Application deployment over heterogeneous grids using distributed ant

Application deployment over heterogeneous grids using distri...

引用

ieee international conference on e-Science and Grid computing

作者： W. Goscinski D. Abramson School of Computer Science and Software Engineering Monash University VIC Australia

The construction of large scale e-Science grid experiments presents a challenge to e-Scientists because of the inherent difficulty of deploying applications over large scale heterogeneous grids. In spite of this, user-oriented application deployment has remained unsupported in grid middleware. This lack of support for application deployment is strongly detrimental to the usability, evolution, uptake and continual development of the grid. This paper presents our motivation, design and implementation of the distributed ant user-oriented application deployment system, including recent extensions to support application deployment over heterogeneous grids. We also present a significant distributed ant deployment case study, demonstrating how a user-oriented application deployment system enables e-Science experiments

关键词： Application software Grid computing Large-scale systems Software engineering Middleware Software maintenance Resource management Computer science Usability Computer networks

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The Impossibility of Boosting distributed Service Resilience

The Impossibility of Boosting Distributed Service Resilience

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international conference on distributed computing systems

作者： P. Attie R. Guerraoui P. Kouznetsov N. Lynch S. Rajsbaum MIT Computer Science and Artificial Intelligence Laboratory USA College of Computer and Information Science Northeastern University USA School of Computer and Communication Sciences EPF Lausanne Switzerland Instituto de Matemáticas Universidad Nacional Auténoma de México Mexico

We prove two theorems saying that no distributed system in which processes coordinate using reliable registers and f-resilient services can solve the consensus problem in the presence of f + 1 undetectable process stopping failures. (A service is f-resilient if it is guaranteed to operate as long as no more than f of the processes connected to it fail.) Our first theorem assumes that the given services are atomic objects, and allows any connection pattern between processes and services. In contrast, we show that it is possible to boost the resilience of systems solving problems easier than consensus: the k-set consensus problem is solvable for 2k - 1 failures using 1-resilient consensus services. The first theorem and its proof generalize to the larger class of failure-oblivious services. Our second theorem allows the system to contain failure-aware services, such as failure detectors, in addition to failure-oblivious services; however, it requires that each failure-aware service be connected to all processes. Thus, f + 1 process failures overall can disable all the failure-aware services. In contrast, it is possible to boost the resilience of a system solving consensus if arbitrary patterns of connectivity are allowed between processes and failure-aware services: consensus is solvable for any number of failures using only 1-resilient 2-process perfect failure detectors

关键词： Boosting Resilience distributed computing Detectors Reliability theory Registers Broadcasting Educational institutions Information science Computer science

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A parallel file transfer protocol for clusters and grid systems

A parallel file transfer protocol for clusters and grid syst...

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ieee international conference on e-Science and Grid computing

作者： D. Bhardwaj R. Kumar Department of Computer Science and Engineering Indian Institute of Technology New Delhi India

Parallel file transfer protocol (PFTP) introduces the concept of data transfer using multiple parallel data paths between clusters. It makes use of striped data distributed across the multiple IO-nodes of a parallel file system on clusters. The protocol uses the striping format of the parallel file system to push multiple stripes of the file over multiple TCP connections. The flexibility in PFTP allows user to use different file transfer applications over these TCP connections. In this paper we describe the design architecture and implementation of PFTP. Several experiments explain how it improves the data transfer rate. We also provide performance results of PFTP for a varying file data size of 100 MB to 4GB. The flexible, secure, fault tolerant and high performance design of PFTP can be useful for large data grids

关键词： Protocols Grid computing Computer applications Bandwidth distributed computing Concurrent computing Application software Data engineering File systems Parallel processing

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Comparative study on time-varying target localization methods using multiple unmanned aerial vehicles: Kalman estimation and triangulation techniques

Comparative study on time-varying target localization method...

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ieee international conference on Networking, Sensing and Control

作者： G. York D. Pack Faculty of Electrical Engineering United States Air Force Academy CO USA

In this paper, we evaluate two different methods to search, detect, and locate mobile radio frequency (RF) targets using multiple cooperative unmanned aerial vehicles (VAVs). The primary difference between the two methods is the target localization technique used: the Kalman estimation technique and the triangulation technique. We compare the two methods on the basis of the total task completion time and the total average target location accuracy. The qualitative results generated by a graphical simulator are presented as a part of our comparison study.

关键词： Unmanned aerial vehicles Kalman filters Radio frequency Frequency estimation sensor phenomena and characterization distributed control Control systems Military computing RF signals sensor systems

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High Fidelity Real-Time Simulator With Mixed Real and Virtual sensors

High Fidelity Real-Time Simulator With Mixed Real and Virtua...

引用

ieee international conference on Robotics and Automation (ICRA)

作者： Z. Papp M. Dorrepaal A.H.C. Thean M.G. van Elk TNO Institute of Applied Physics TNO-TPD Delft Netherlands

The advance in interactive/cooperative robotics and integration of robots into populated environments puts emphasis on robot-robot and robot-environment (incl. human) interactions. Sensing and sensory data interpretation play ever increasing role because sensing becomes the primary way of collecting information about the environment. In this application domain the environment is unstructured, which results in demanding data interpretation and control algorithms. Similarly, the control and decision-making algorithms inevitably become more complex in order to be able to cope with the unstructured and dynamic environment. Consequently a sophisticated evaluation/test environment is required, which provides full control of the circumstances, reproducibility and flexible mix of real and virtual components. The paper presents a multi-agent based distributed HIL simulation environment (MARS), which assures scalable real-time performance and introduces an extension with high fidelity sensor simulation functionality.

关键词： Robot sensing systems Human robot interaction Mars Computational modeling Reproducibility of results Vehicle dynamics System testing Virtual environment distributed computing Decision making

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