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Scale-free topology for large-scale wireless sensor networks

Scale-free topology for large-scale wireless sensor networks

引用

3rd ieee/IFIP international conference in Central Asia on Internet

作者： Wang, Lili Dang, Jianxun Jin, Yi Jin, Huihua Beihang Univ Sch Comp Sci Beijing 100083 Peoples R China

ISBN: (纸本)9781424410064

In this paper, we propose an efficient and fault tolerant topology control algorithm named AWSF for large-scale wireless sensor networks, which introduces the scale-free characteristic of complex networks into the topology of wireless sensor networks to minimize transmission delay and increase robustness. It is a distributed algorithm, letting each node locally adjust its transmission power and determine its neighbor relationship based on certain arbitrary weights which are random real numbers following a negative power-law probability distribution. The topology constructed under AWSF is proved to be scale-free, strongly connected and bi-directional. Simulation results show that the resulting topology has a small average degree and good network performance in terms of transmission delay and robustness.

关键词： sensor networks topology control scale-free time efficient fault tolerant

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Technology drivers and challenges for next generation distributed spacecraft systems

Technology drivers and challenges for next generation distri...

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3rd international conference on Recent Advances in Space Technologies

作者： Kurtulus, Can Imre, S. Egemen Yuksel, Gokhan Inalhan, Gokhan Istanbul Tech Univ Fac Aeronaut & Astronaut Istanbul Turkey TUBITAK Uzay Satellite Technol Grp Ankara Turkey

ISBN: (纸本)9781424410569

distributed spacecraft systems is envisioned to provide the technology platform to extend, improve and enable mission concepts such as wide aperture radars for high-precision space-borne surveillance, 3D mapping of Earth's magnetic field and even deep-space interferometry to better understand the origins of the universe. However, a mission with a fully autonomous spacecraft fleet flying in close-proximity or in a tightly kept configuration has yet to be realized. In this work, we review the major technology drivers and challenges for such next generation systems across a selective set of on-going, cancelled or proposed space missions. Our analyses identify five main classes of technology drivers from navigation and control perspective. These drivers are enumerated for a typical interferometric SAR example. The example illustrates steep technological challenges such as the need for sub-millimeter relative navigation solution accuracy for even decimeter level vertical image resolution. We conclude with an initial effort at outlining a cost effective and robust roadmap for flight maturation of the key technologies to deem such missions and goals achievable.

关键词： Image resolution

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Proceedings of the 3rd ieee international conference on Automation Science and Engineering, ieee CASE 2007

Proceedings of the 3rd IEEE International Conference on Auto...

引用

3rd ieee international conference on Automation Science and Engineering, ieee CASE 2007

ISBN: (纸本)1424411548

The proceedings contain 189 papers. The topics discussed include: resource-task assignment process with rejections and reassignments;capacity planning for semiconductor wafer fabrication with uncertain demand and capacity;information measures for biometric identification via 2D discrete wavelet transform;qualitative localization by full-view spherical image;two-degree-of-freedom based cross-coupled control for high-accuracy tracking systems;towards an automated multiagent taxi-dispatch system;towards effective multi-platforming design of product family using genetic algorithm;robust calibration for localization in clustered wireless sensor networks;resource allocation for a life science automation line: a Petri nets approach;and analysis of the effects of truncation on the EWMA observer.

关键词： Automation

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Experimenting with dynamic test component deployment in TTCN-3

Experimenting with dynamic test component deployment in TTCN...

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3rd international conference on Testbeds and Research Infrastructure for the Development of Networks and Communities

作者： Csorba, Mate J. Eottevenyi, Dadniel Palugyai, Sandor Norwegian Univ Sci & Technol Dept Telemat N-7491 Trondheim Norway Budapest Univ Technol & Econ Dept Telecommun & Media Informat H-1117 Budapest Hungary

ISBN: (纸本)9781424407385

In our work, we investigate efficient usage of TTCN-3 based test components in the emerging field of distributed performance testing of communicating systems. TTCN-3 is a high level formal specification language used for the specification of Abstract Test Suites (ATSs) suitable for various testing purposes mainly in telecommunication systems testing. A TTCN3 based test system may consist of several distributed Parallel Test Components (PTCs) and can be executed utilizing diverse hardware platforms. Our aim is to aid development of load tests by establishing a framework, while collecting best practices at the same time, that can be used to execute tests over mixed hardware resources efficiently. We, mainly focus on automated and dynamic deployment of load test components implemented purely in TTCN-3. Also, the deployment method takes test system load into account by monitoring the participating workstations' behavior on-line. A potential test method is shown that can be used for testing server applications using low-cost or even legacy hardware as the platform for distributed test components. A basic scenario involving SMTP (Simple Mail Transfer Protocol) service testing is presented as an example.

关键词： Testing

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Activation scheduling for a binary sensor network

Activation scheduling for a binary sensor network

引用

3rd Intelligent sensors, sensor Networks and Information Processing conference

作者： La Scala, Barbara F. Univ Melbourne Dept Elect & Elect Engn Melbourne Syst Lab Parkville Vic 3052 Australia

ISBN: (纸本)9781424415014

This paper examines a sensor scheduling problem for target tracking using a network of distributed passive sensors. It considers how to schedule sensor activation to minimise bandwidth and battery usage while maintaining track accuracy. The sensor network is made up of simple acoustic, binary proximity sensors. Four different scheduling methods are considered. Two of these methods are heuristic while the other two are optimal, one-step ahead schedulers for differing objectives. The performance of all four algorithms is compared using simulations. The results show that it is possible to obtain adequate performance with only a subset of the sensor field active at any one time.

关键词： Chemical activation

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A High-security and Low-power AES S-Box Full-custom Design for Wireless sensor Network

A High-security and Low-power AES S-Box Full-custom Design f...

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

作者： Liu Zhenglin Zeng Yonghong Zou Xuecheng Han Yu Chen Yicheng Huazhong Univ Sci & Technol Dept Elect Sci & Technol Res Ctr VLSI & Syst Wuhan 430074 Peoples R China

ISBN: (纸本)9781424413119

The Advanced Encryption Standard (AES) S-Box was the only non-linear structure of the AES algorithm;it dominated the hardware complexity of the AES cryptographic module. For Wireless sensor Network applications, S-Box must offer low power, small area and high security. In this paper, a full-custom S-Box implementation with low-power, compact and well DPA-resistant property was proposed. The energy-efficient Pass Transmission Gate (PTG) and three-input exclusive-OR (XOR) gate based on three-transistor XOR element were used to realize the functionality of S-Box, it resulted in the reduction of the area tradeoff and power consumption. The PTG-based latches, controlled by asynchronous latch controllers, were inserted in the data path to block the propagation of the dynamic hazards. A countermeasure against Differential Power Analysis, based on random delay insertion, was presented to attain high-security. The resulting implementation on a 0.25 mu m CMOS process is very suitable for the source-limited wireless sensor node chips.

关键词： Advanced Encryption Standard (AES) Wireless sensor Network S-Box Differentia Power Analysis asynchronous circuit random delay insertion

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An energy-efficient mechanism using CLMAC protocol for wireless sensor networks

An energy-efficient mechanism using CLMAC protocol for wirel...

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3rd international conference on Networking and Services, ICNS 2007

作者： Cho, Jaejoon Kim, Sungho Nam, Heungwoo An, Sunshin Computer Network Lab. Dep. of Electronics Engineering Korea University Sungbuk-gu Anam-dong 5ga 1 Seoul 136-701 Korea Republic of

Energy efficiency is a key issue because most wireless sensor networks use battery-oriented computing and sensing devices. A network of these devices will collaborate for a common application such as environment monitoring. Thus, energy-efficient MAC protocols have focused on minimizing idle listening time at sensor nodes. Recently, energy-efficient protocols such as S-MAC, B-MAC and EA-ALPL proposed to reduce energy consumption. Here, we propose a cross-layer mechanism called Cross Layer Medium Access Control (CLMAC) protocol that designed for wireless sensor networks. To meet energy-efficient routing, the CLMAC includes routing distance in the preamble field of the B-MAC. Because the CLMAC unified network layer and link layer uses routing distance without big routing table, it enables nodes to reduce control traffic routing overhead. Also, the CLMAC makes it possible to extend the lifetime of the wireless sensor networks that contain a number of nodes. The analytical results show that CLMAC protocol reduces routing overhead of the sensor nodes in wireless sensor networks. © 2007 ieee.

关键词： Medium access control

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Energy Efficient Design of WSN Based on An Accurate Power Consumption Model

Energy Efficient Design of WSN Based on An Accurate Power Co...

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

作者： Kan, Baoqiang Cai, Li Zhao, Lei Xu, Yongjun AF Engn Univ Coll Sci Xian 710052 Peoples R China Chinese Acad Sci Inst Comp Technol Lab Wireless Sensor Networks Beijing 100080 Peoples R China

ISBN: (纸本)9781424413119

A particular challenge in maintaining extended wireless sensor networks(WSNs) lifetime lies in achieving communications with low power. For better understanding of the design trade offs of WSNs, a more accurate power consumption model for wireless sensor node is proposed. Different from models ever showed, in which the power consumption of each component in WSN node is assumed constant, the new one takes into account energy dissipation of circuits in practical physical layer. It shows that there are sonic parameters such as data rate, carrier frequency, RF output power et al, which have a significant effect on the WSN node with the metric energy per useful bit (EPUB). Then an optimal design method to make the network energy efficient is described by adjusting one or more of these parameters. The efficiency of the strategy was validated by mathematical analysis and simulations. The results showed that the EPUB can be reduced by optimally choosing the rate-power combination based on the proposed power consumption model for a given load.

关键词： wireless sensor networks (WSNs) power consumption model energy efficient design

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The adapta framework for building self-adaptive distributed applications

The adapta framework for building self-adaptive distributed ...

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

作者： Sallem, Mareio Augusto Sekeff Da Silva e Silva, Francisco José Universidade Federal do Maranhão Programa de Pos-Graduaacão em Engenharia de Eletricidade Av. Portugueses S/N Bacanga São Luis MA Brazil Universidade Federal do Maranhão Departamento de Informática Av. Portugueses S/N Bacanga São Luis MA Brazil

ISBN: (纸本)076952799X

Modern computing environments are characterized by a high degree of dynamism that, along with the heterogeneity of computational devices and communication infrastructure, demand the development of a new range of applications that must be able to self-adapt dynamically and transparently according to changes in its execution environment. On a computational Grid, for instance, it is common to notice a high variation on resource availability, node instability, variations on load distribution, and heterogeneity of computational devices and network technology. The Adapta framework is a reflective middleware that provides the means to develop self-adaptive component-based distributed applications, separating the business code from the one responsible for adaptation. Adapta also provides a runtime execution environment that monitors computational resources and notifies application components about the occurrence of important events that should trigger reconfiguration actions. Adapta provides a XML based reconfiguration language that defines how the application must adapt in response to environmental changes. Statements of the reconfiguration language can also be applied at runtime, which allows to dynamically change the reconfiguration mechanism itself. This paper describes Adapta architecture, implementation, and evaluation through a concrete case study, where a Grid infrastructure is augmented for incorporating autonomic mechanisms towards a self-healing and self-optimization infrastructure. © 2007 ieee.

关键词： Middleware

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Process Capability Evaluation in Skew distributed Processes Based on SWV Method

Process Capability Evaluation in Skew Distributed Processes ...

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

作者： Yang Jianfeng Zhengzhou Univ Coll Commercial Zhengzhou 450052 Peoples R China

ISBN: (纸本)9781424413119

Process Capability Analysis is an important quality tools in 6Sigma management. The calculating methods of standard capability indices in process capability assessment are based on the hypothesis that the distributions of process output are normal or approximate normal. There is a lot of practice cases in which the output isn't normal. Because the forms of these distributions are unknown, the results of evaluation may be misleading to a judgment about the processes. When the distribution is on the skew, the Clements method is used after estimating the form of distribution by a lot of data from process output. With the not truly known distribution, there is big gap in the assessment result. Based on Scaled weighted variance method, some process capability indices formulas, which can be used in skew distribution, are established in the paper. The simulation study was done for comparison between the WV-based and SWV-based PCI.

关键词： Process capability index Skew process Scaled weighted variance method Proportion noncomformance

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