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On high-throughput and fair multi-hop wireless ad hoc networks with MIMO 06

On high-throughput and fair multi-hop wireless ad hoc networ...

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3rd international conference on Mobile Technology, Applications and systems

作者： Li, Yihu Safwat, Ahmed M. Queen's Laboratory for Advanced Wireless Networks Department of Electrical and Computer Engineering Queen's University Kingston ON K7L 3N6 Canada

ISBN: (纸本)1595935193

Nowadays, the prevalence of multimedia applications mandates that wireless networks provide higher throughput and increased spatial efficiency. Aimed primarily at achieving this goal, the first ieee 802.11n draft was recently approved. In the draft, MIMO and frame aggregation are utilized to improve the PHY and MAC layers in single-hop WLANs by achieving high raw rates and goodput. However, in the context of multi-hop wireless ad hoc networks, the hidden terminal, exposed terminal, and deafness problems remain unsolved by ieee 802.11n. Consequently, this greatly degrades the MAC efficiency in multi-hop wireless ad hoc networks, even in the presence of frame aggregation. In this paper, we propose a novel MAC scheme that utilizes MIMO distributed spatial multiplexing to solve all the aforementioned problems, resulting in high throughput and fairness in multi-hop wireless ad hoc networks. Moreover, our scheme can be integrated with frame aggregation to further enhance the network performance. Copyright 2006 ACM.

关键词： Ad hoc networks

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A neural network-based sensor for elder falling detection

A neural network-based sensor for elder falling detection

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3rd international conference on Informatics in Control, Automation and Robotics

作者： Pan, Jiann-, I Yung, Cheng-Jie Liang, Chung Chao Tzu Chi Univ Dept Med Informat Hualien Taiwan Tzu Chi Hosp Hualien Taiwan

ISBN: (纸本)9728865597

Failing down is going to be a crucial problem to an elder today. In many countries, unintentional injury was being one of the leading causes of death in persons over age 65 years. As the society now, there are more and more solitary elders of life alone and because of the isolation, it is necessary to design an intelligent and sensitive falling detector for the elderly people. In this paper, we present an intelligent and portable fall detection device based on artificial neural network technology. This fall detector consists of two main components: accelerometer and microprocessor. The tri-axis accelerometer is used to continuously measure the variation of elder's 3 ways acceleration. The microprocessor reads the signals from the accelerometer and performs the fall activity recognition through a back-propagation neural network model. This device is integrated in a small box which can be holding on the belt for elder.

关键词： fall detection accelerometer neural network back-propagation model

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Multiprocessor robot controller -: An experimental robot controller for force-torque control tasks

Multiprocessor robot controller -: An experimental robot con...

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3rd international conference on Informatics in Control, Automation and Robotics

作者： Olah, Istvan Tevesz, Gabor Budapest Univ Technol & Econ Dept Automat & Appl Informat Goldmann Gyorgy Ter 3-4em Budapest Hungary

ISBN: (纸本)9728865600

There is ongoing research and development in the field of hybrid position and force control of the assembly robots at the Department of Automation and Applied Informatics and the Department of Control Engineering and Information Technology, Budapest University of Technology and Economics. As result, an Experimental Robot Controller was built for the special needs of the project. Both the hardware and the software system of the controller are under continuous development. The most recent achievement is, a built in six-component force-torque sensor. The development of the software system is currently dealing with the extension of the programming environment with force-torque control possibilities. There are numerous industrial applications for force and torque control (i.e. screw driver, welder), but a flexible equipment can provide much more than just the possibility of solving a single task. This paper presents an overview of the robot controller hardware, separately detailing the force-torque sensor interface. The second part of this paper overviews the software system of the controller and the possibilities of its extensions for force control tasks.

关键词： robot controller multiprocessor systems PUMA 560 QNX digital signal processor hybrid position and force control

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DIRECT: A Robust distributed Broker Framework for Trust and Reputation Management

DIRECT: A Robust Distributed Broker Framework for Trust and ...

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ieee international conference on e-Commerce Technology (CEC)

作者： Yue Zhang Kwei-Jay Lin R. Klefstad Department of Electrical Engineering and Computer Science University of California Irvine Irvine CA USA

Reputation systems for e-commerce uses past behaviors as a predictor of future behaviors. Reputation systems must meet the challenge on how to differentiate honest feedbacks from dishonest ones in order to reduce the system vulnerability due to malicious attacks. To address this issue, we propose a distributed reputation and trust management broker framework, called DIRECT, for dishonesty prevention. In DIRECT, malicious attacks are monitored and detected by local and cross-broker check mechanisms using statistical distribution test technologies. In the presence of dishonest feedbacks, DIRECT effectively classifies users into the green (good) and red (bad) groups. It saves the correct reputation information provided by the green group, and reduces the impact of dishonest feedbacks from the red group. The performance study shows that the DIRECT sanity check mechanism works effectively in the presence of dishonest and malicious feedbacks

关键词： Robustness Feedback Monitoring Statistical distributions Scattering Filtering Engineering management Computer science Testing Large-scale systems

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Web Service Indexing for Efficient Retrieval and Composition

Web Service Indexing for Efficient Retrieval and Composition

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ieee international conference on e-Commerce Technology (CEC)

作者： M. Aiello C. Platzer F. Rosenberg Huy Tran M. Vasko S. Dustdar Distributed Systems Group Technical University of of Vienna Vienna Austria

The success and widespread use of Web service technology is bound to the availability of tools for rapidly discovering services and for composing their operations. We present a system for service discovery and composition based on syntactic and semantic matching of the published service interfaces. The system relies on accurate preprocessing of the available services, that is, on the indexing time of the services' descriptions. The composition task is performed by index lookup and an efficient heuristic for graph traversing. The presented system is the VitaLab entry for the syntactic and semantic WS-challenge 2006

关键词： Web services Indexing Ontologies Availability Runtime Costs Web and internet services XML Nonvolatile memory

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Adaptive Data Collection Scheme for Tracking Mobile Target in Wireless sensor Networks

Adaptive Data Collection Scheme for Tracking Mobile Target i...

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international conference on Mobile and Ubiquitous systems: Networking and Services (MobiQuitous)

作者： Ling Zhou Arunabha Sen Department of Computer Science and Engineering Arizona State University Tempe AZ USA

Tracking mobile targets is an important application of wireless sensor networks. However, mobility of the target brings new challenges to designing energy-efficient and scalable data collection schemes. A novel dynamic grid-based tracking (DGT) scheme for tracking mobile target is proposed in this paper. This scheme is distributed in nature, and can be adaptive to the mobility of the target. The underlying idea of embedding a virtual grid structure and restricting mobility-related choices to grid nodes can be generally applied to other wireless sensor networks applications, where mobility is an important consideration during protocol design

关键词： Target tracking Wireless sensor networks Collaboration Energy efficiency Wireless application protocol Telecommunication traffic Computer science Data engineering Power engineering and energy Mobile computing

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Service Discovery in P2P Service-oriented Environments

Service Discovery in P2P Service-oriented Environments

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ieee international conference on e-Commerce Technology (CEC)

作者： Qianhui Althea Liang Jen-Yao Chung Hui Lei School of Information Systems Singapore Management University Singapore IBM Thomas J. Watson Research Center USA

The P2P service-oriented environment presents new opportunities and challenges for distributed computing and resource sharing. In this paper, we present a middleware infrastructure, called CCSD, for decentralized service discovery in a wide-area ad hoc P2P service-oriented environment. Two of the key ideas of a CCSD P2P network are: 1) the concept of context awareness is extended to the awareness of service capacities of P2P peers, by which peers are able to understand and compare each other's service capacities; and 2) a peer's capacity context description is replicated in several designated peers in addition to the peer itself. Using a hash table, the description of the most suitable capacity context for a service request can be located quickly and the service request is forwarded to and served at the peer associated with that capacity context. CCSD, designed to satisfy the dynamic and constrained nature of the ad hoc P2P environments, benefits service users in the environments by providing the most suitable service capacity transparently

关键词： Context-aware services distributed computing Context awareness Middleware Peer to peer computing Service oriented architecture Resource management Management information systems Environmental management Information management

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Dynamic Resource Prices in a Combinatorial Grid System

Dynamic Resource Prices in a Combinatorial Grid System

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ieee international conference on e-Commerce Technology (CEC)

作者： M. Schwind O. Gujo T. Stockheim Business Administration esp. Information Systems Frankfurt University Frankfurt Germany Business Information Systems and Operations Research Technical University of Kaiserslautern Kaiserslautern Germany

Our paper presents an agent-based simulation environment for task scheduling in distributed computer systems (grid). The scheduler enables the simultaneous allocation of bundles comprising resources such as CPU time, communication bandwidth, volatile, and non-volatile memory. The resources are allocated by an iterative combinatorial auction with proxy-bidding agents trying to acquire their desired resource allocation profiles. In order to support an efficient bidding process, the auctioneer provides resource price information to the bidding agents. Due to the complementarities and substitutionalities of the bid bundles in the proposed setting, the calculation of these prices is computationally expensive. This article proposes two different price approximation mechanisms: one scarcity based-scheme and a second approach using shadow prices based on the dual formulation of the relaxed linear program of the allocation problem. The stability of both allocation mechanisms is compared in the context of a closed grid system (economy) where agents buy and sell production capacity. The objective of each agent is to acquire complementary resource capacity to increase his productivity. The system's pricing and the agents' bidding behavior is evaluated based on both measures in situations of gradually increasing resource failure to test the stability of the allocation mechanism

关键词： Resource management Processor scheduling Stability Computational modeling Computer simulation distributed computing Grid computing Bandwidth Nonvolatile memory Production systems

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Applying Ant-based Multi-Agent systems to Query Routing in distributed Environments

Applying Ant-based Multi-Agent Systems to Query Routing in D...

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international ieee conference on Intelligent systems, IS

作者： Elke Michlmayr Arno Pany Sabine Graf Women's Postgraduate College for Internet Technologies (WIT) Institute for Sof tware Technology and InteractiveSystems University of Technology Vienna Vienna Austria Institute for Sof tware Technology and InteractiveSystems University of Technology Vienna Vienna Austria

This paper presents SemAnt, a novel ant-based multi-agent system designed for distributed query routing. While the ant metaphor has been successfully applied to network routing both in wireless and fixed networks, little is yet known about its applicability to the task of query routing in distributed environments. We point out the similarities and dissimilarities between routing of data packets and routing of queries, and we present the design of SemAnt, which is based on the ant colony optimization meta-heuristic. For experimental evaluation, we deploy the algorithm in a peer-to-peer environment with a real-world application scenario and compare its performance against the well-known k-random walker approach. As we show, the benefits of SemAnt are that the routes for queries are optimized according to their popularity, and that the algorithm is highly suitable for volatile environments

关键词： Multiagent systems Query processing Routing Peer to peer computing Ant colony optimization Artificial intelligence Intelligent systems Broadcasting Autonomous agents Algorithm design and analysis

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A Privacy-Aware Service-oriented Platform for distributed Data Mining

A Privacy-Aware Service-oriented Platform for Distributed Da...

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ieee international conference on e-Commerce Technology (CEC)

作者： Xiaofeng Zhang Ho-fai Wong W.K. Cheung Department of Computer Science Hong Kong Baptist University Kowloon Hong Kong China

Customer data privacy is known to be a factor which makes just-in-time data sharing and mining among enterprises challenging. Learning-from-abstraction is a recently proposed paradigm for privacy preserving distributed data mining where distributed local data sources are protected by probabilistic data abstraction. In this paper, we investigate the use of a normalized negative log likelihood together with the paradigm for quantifying the level of privacy protection, and studied theoretically the change of the privacy levels of the local data abstractions after being aggregated for global data analysis. Experiments on distributed data clustering with a synthetic data set were conducted on a service-oriented BPEL platform. The promising results obtained demonstrates the effectiveness of the adopted privacy measure

关键词： Data mining Data privacy Service oriented architecture Protection Data analysis Communication system control Covariance matrix Computer science distributed computing Medical services

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