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检索条件"任意字段=3rd IEEE International Conference on Distributed Computing in Sensor Systems, DCOSS 2007"

共 175 条记录，以下是101-110 订阅

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distributed Fixed-Step Power Control of Cellular Mobile systems via Window Concept

Distributed Fixed-Step Power Control of Cellular Mobile Syst...

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3rd international conference on Wireless Communications, Networking and Mobile computing (WiCOM 2007)

作者： Chen, Young-Long Li, Chih-Peng Wang, Jyu-Wei Wen, Jyh-Horng Natl Chung Cheng Univ Dept Elect Engn 168 Univ Rd Chiayi Taiwan Chien Kuo Technol Univ Dept Elect Engn Changhua Taiwan Natl Sun Yat Sen Univ Inst Commun Engn Kaohsiung 80424 Taiwan Univ Asia Dept Comp & Commun Engn Taichung Taiwan

ISBN: (纸本)9781424413119

In the open literature, it is shown that the received carrier-to-interference ratio (CIR) in cellular mobile systems can be maintained within the desirable range provided that the path gain remains approximately constant over a number of consecutive power control steps. However, when channels suffer short-term fading, it is not clear whether existing power control algorithms remain convergent. This paper proposes a distributed fixed-step power control algorithm with binary feedback via window concept for cellular mobile systems. The performance of the proposed scheme is analyzed in short-term fading channels. A sufficient condition for system stability is derived using a simple received CIR model and a power control window. It is shown that the bound of the received CIR of each user varies as a function of the target CIR the size of the power control step, and the link gain.

关键词： power control convergence region step size cellular system

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Agent-based trust model in Wireless sensor Networks

Agent-based trust model in Wireless Sensor Networks

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8th ACIS international conference on Software Engineering, Artificial Intelligence, Networking and Parallel/distributed computing/3rd ACIS international Workshop on Self-Assembling Wireless Networks

作者： Chen, Haiguang Wu, Huafeng Zhou, Xi Gao, Chuanshan Shanghai Normal Univ Math & Sci Coll Shanghai 200234 Peoples R China Fudan Univ Dept Comp Sci & Engn Shanghai 200433 Peoples R China

ISBN: (纸本)0769529097

Wireless sensor Networks (WSNs) have an excellent application to monitor environments such as military surveillance and forest fire. However, in many scenarios, WSNs are of interested to adversaries and these sensor nodes are deployed in open and unprotected environments, the security of WSNs is still an important issue. Traditionally cryptographic mechanisms such as authentication and encryption only address part of the problem of security in WSNs. In recent years, the use of reputation and trust systems has become an important mechanism for security in WSNs. In this paper, we develop a distributed agent-based trust model in WSNs. We also discuss some attacks in reputation and trust system, and offered some schemes to defense these attacks. The simulation results and analysis show that our model can detect the malicious nodes fast and accurately and efficiently prevent these attacks in WSNs.

关键词： Wireless sensor networks

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A Dynamic Load Balancing Routing Algorithm for distributed Wireless sensor Networks

A Dynamic Load Balancing Routing Algorithm for Distributed W...

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3rd international conference on Wireless Communications, Networking and Mobile computing (WiCOM 2007)

作者： Su, Ying Zheng, Shijue Gamage, Shanthi Li, Kai Huazhong Normal Univ Dept Comp Sci Wuhan 430079 Peoples R China

ISBN: (纸本)9781424413119

In wireless sensor networks where nodes operate on limited battery energy, some other unique characteristics make these nodes impossible to be replaced or recharged, so the efficient utilization of the energy Is very Important. There are many papers proposed In order to reduce energy consumption, but at the same time another problem emerged, i.e., for each node with limited energy the cumulative load of data traffic from its neighbor nodes will become heavier and the energy of such nodes will deplete more quickly than before. So we have formulated the routing problem as maximizing the network lift-time. Firstly we split these nodes Into to some domains, and then we balance load among each domain dynamic. Considering this we describe a dynamic load balancing routing algorithm based on each node's energy, through which we trying to maximize the lifetime of each node as well as the whole lifespan of the sensor networks. Through our models and algorithms, the simulation results showed our algorithms are more dynamic and mobility efficient, nodes can change their domains if necessary.

关键词： Wireless sensor networks Data aggregation AP node Dynamic load balancing routing algorithm

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Large-scale service deployment?Application to OSGi

Large-scale service deployment?Application to OSGi

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3rd international conference on Autonomic and Autonomous systems, ICAS 2007

作者： Baude, Françoise Contes, Virginie Legrand Lestideau, Vincent INRIA I3S CNRS UNSA 2004 rte des Lucioles F-06902 Sophia-Antipolis France Laboratoire LSR-IMAG 220 rue de la chimie F-38041 Grenoble France

ISBN: (纸本)076952799X

This paper introduces an architecture for deploying software (components, services, etc) on distributed, large-scale computing infrastructures, like e.g. computing grids. Deployment encompasses many actions like the discovery of resources and enquiry about their current state, selection among the different versions of the software according to these states, robust, scalable and rapid software provisioning, installation and start-up, and eventually software installation monitoring, updating and unprovisioning. Our solution addresses all those steps through an integrated and scalable approach implemented using the standard Java JMX and the ProActive Grid technologies, which we illustrate in the context of OSGi gateways. © 2007 ieee.

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The bio-inspired service life-cycle: An overview

The bio-inspired service life-cycle: An overview

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3rd international conference on Autonomic and Autonomous systems, ICAS 2007

作者： Pfeffer, Heiko Linner, David Radusch, Ilja Steglich, Stephan TU Berlin Sekr. FR 5-14 Franklinstrasse 28/29 10587 Berlin Germany

ISBN: (纸本)076952799X

The increase in mobility and heterogeneity of networked devices raised the need for autonomous service oriented computing environments promising a significant reduction in development and management complexity. Current services underlie a traditional service life cycle, leaving little room for autonomous service behavior, causing that service autonomy is commonly realized through rule-based adaptation mechanisms. Within this paper, a biologically inspired life-cycle is proposed, enabling service evolution in addition to service adaptation. This concept is then extended to the services ' design phase, providing the autonomous creation and transformation of services in order to respond to changes in the user's requirements or surrounding and the ability to generate new functionalities potentially not yet requested by to the userl. © 2007 ieee.

关键词： distributed computer systems

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3rd international conference on Networking and Services, ICNS 2007

3rd International Conference on Networking and Services, ICN...

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3rd international conference on Networking and Services, ICNS 2007

The proceedings contain 119 papers. The topics discussed include: host identity specific multicast;measuring network parameters with hardware support;an energy-efficient mechanism using CLMAC Protocol for wireless sensor networks;a lightweight traffic management approach for service differentiation;simplified network management with DACS scheme;trouble shooting in distributed service centers: rule based software approach for data mining in complex systems;towards system-level optimization for high performance unified threat management;distributed adaptations to traffic quality requirements;a secure routing protocol for ad hoc networks based on trust;reservation-based data flow scheduling in distributed control applications;point-to-point services in hybrid networks: technologies and performance metrics;and extended DACS scheme implementing security function.

关键词： Internet protocols

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A wireless sensor network target tracking system with distributed competition based sensor scheduling

A wireless sensor network target tracking system with distri...

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3rd Intelligent sensors, sensor Networks and Information Processing conference

作者： Toh, Yue Khing Xiao, Wendong Xie, Lihua Nanyang Technol Univ Sch Elect & Elect Engn Nanyang Ave Singapore 639798 Singapore Inst Informat Res Networking Protocols Dept Singapore 119613 Singapore

ISBN: (纸本)9781424415014

In existing distributed target tracking systems, usually the next tasking sensor node is selected from the candidate sensor nodes by the current tasking sensor node. In this paper we demonstrate by a real test-bed that such approach may not achieve satisfactory tracking performance due to the long computation time needed for sensor scheduling. We develop a distributed target tracking system implementing a novel competition based distributed sensor scheduling scheme where a candidate sensor node with highest predicted tracking accuracy will be elected as the new tasking sensor with highest probability. The system hardware and software architectures are described and the superior tracking performances of the system are demonstrated with experimental comparison with existing sensor scheduling schemes.

关键词： sensor nodes

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Periodic global broadcast time synchronization (PGB-TS) for TDMA based sensor networks

Periodic global broadcast time synchronization (PGB-TS) for ...

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3rd international conference on Recent Advances in Space Technologies

作者： Bekmezci, Ilker Alagoez, Fatih Arslan, M. Goekcen Turkish AF Acad Hava Harp Okulu Istanbul Turkey Bogazici Univ TR-80815 Bebek Turkey

ISBN: (纸本)9781424410569

Wireless sensor networks become a new alternative for satellite systems to sense fine grained small size subjects. Time synchronization is an important aspect of distributed systems including wireless sensor networks (WSNs). Traditional time synchronization methods are mostly optimized for scalability and precision. We propose a Periodic Global Broadcast Time Synchronization (PGB-TS) mechanism for TDMA based WSNs to maximize energy efficiency. PGB-TS assumes that the sink can send periodic broadcast to all sensor nodes. sensor nodes receive the global reference broadcast and synchronize themselves to the sink. PGB-TS estimates clock drift with linear regression and accepts receive error. Energy consumption of radio circuit of a sensor network is modeled analytically. Simulation results show that PGB-TS consumes significantly less energy at the expense of somewhat lowered precision. Unfortunately, because of its lower precision, energy consumption of a sensor network with PGB-TS increases with the increased number of children. To avoid the dependency in the number of children, we also propose to employ a new Data Indication Slot Mechanism (DISM) into PGB-TS. Beneficially, DISM prevents redundant checks at the expense of possible overhearing situations. Analytical model for the proposed PGB-TS with DISM is supported by the simulation results.

关键词： Time division multiple access

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Separating the wheat from the chaff: Practical anomaly detection schemes in ecological applications of distributed sensor networks

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3rd ieee international conference on distributed computing in sensor systems

作者： Bettencourt, Luis M. A. Hagberg, Aric A. Larkey, Levi B. Los Alamos Natl Lab Div Theoret Los Alamos NM 87545 USA Los Alamos Natl Lab Comp & Comp Sci Div Los Alamos NM 87545 USA

ISBN: (纸本)9783540730897

We develop a practical, distributed algorithm to detect events, identify measurement errors, and infer missing readings in ecological applications of wireless sensor networks. To address issues of non-stationarity in environmental data streams, each sensor-processor learns statistical distributions of differences between its readings and those of its neighbors, as well as between its current and previous measurements. Scalar physical quantities such as air temperature, soil moisture, and light flux naturally display a large degree of spatiotemporal coherence, which gives a spectrum of fluctuations between adjacent or consecutive measurements with small variances. This feature permits stable estimation over a small state space. The resulting probability distributions of differences, estimated online in real time, are then used in statistical significance tests to identify rare events. Utilizing the spatio-temporal distributed nature of the measurements across the network, these events are classified as single mode failures-usually corresponding to measurement errors at a single sensor- or common mode events. The event structure also allows the network to automatically attribute potential measurement errors to specific sensors and to correct them in real time via a combination of current measurements at neighboring nodes and the statistics of differences between them. Compared to methods that use Bayesian classification of raw data streams at each sensor, this algorithm is more storage-efficient, learns faster, and is more robust in the face of non-stationary phenomena. Field results from a wireless sensor network (sensor Web) deployed at Sevilleta National Wildlife Refuge are presented.

关键词： Measurement errors

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Proceedings of the: The 3rd international Comference on Collaborative computing: Networking, Applications and Worksharin, CollaborateCom 2007

Proceedings of the: The 3rd International Comference on Coll...

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3rd international conference on Collaborative computing: Networking, Applications and Worksharing, CollaborateCom 2007

ISBN: (纸本)1424413176

The proceedings contain 61 papers. The topics discussed include: controlled sharing of identity attributes for better privacy;a structure preserving approaching for securing XML documents;two-level signature delegation for mobile first responder authentication;a request-driven secure interoperation framework in loosely-coupled multi-domain environments employing RBAC policies;unraveling decentralized authorization for multi-domain collaborations;toward trust-aware access management for ad-hoc collaborations;towards secure and trusted collaboration environment for European public sector;secure peer-to-peer networks for trusted collaboration;towards mixed-initiative access control;legal issues in grid collaborative environments;transparent security for collaborative environments;and collaborative event detection using mobile and stationary nodes in sensor networks.

关键词： distributed computer systems

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