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ENERGY-EFFICIENT BROADCASTING IN WIRELESS AD HOC NETWORKS LOWER BOUNDS AND ALGORITHMS

Journal of Interconnection Networks 2002年第3N04期3卷 149-166页

作者： FANG BIAN ASHISH GOEL C. S. RAGHAVENDRA XIN LI Department of Computer Science University of Southern California Los Angeles CA 90089-0781 USA Bian and Raghavendra are supported in part by the DARPA contract F33615-00-C-1633 in the Power Aware Computing and Communications Program and by the DARPA/AFRL under agreement no. F30602-01-2-0549. Goel is supported in part by the NSF GAREER award 0133968. Department of Electrical Engineering University of Southern California Los Angeles CA 90089-2652 USA

Energy-efficient communication is critical for increasing life of power limited wireless ad hoc networks. There has been considerable interest in minimum energy broadcast operations. In this paper, we develop bounds and an algorithm for minimizing energy cost for broadcasting from any source to all other nodes in the network. Most prior work have used simpler model for energy cost for wireless communications by accounting only the analog radiation cost for transmission and ignored the fixed cost for electronics in transmission and reception circuitry in nodes. Furthermore, in a network it is possible for some node pairs not be able to communicate directly even though they are in their radio ranges due to obstacles present in the terrain of the network.

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BOOK REVIEW: Bioimpedance and Bioelectricity Basics, by Sverre Grimnes and Orjan G. Martinsen

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Annals of Biomedical engineering 2002年第2期30卷 282-282页

作者： Vieira, Luis Carlos Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial Departamento de Eletrônica e Telecomunicações (Graduate Program in Electrical Engineering and Industrial Computer Science Department of Electronics and Telecommunications) Centro Federal de Educação Tecnológica do Paraná (Federal Center of Technological Education of Paraná) Curitiba Brazil

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Generalized regression neural networks for biomedical image interpolation

Generalized regression neural networks for biomedical image ...

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International Joint Conference on Neural Networks (IJCNN)

作者： M.P. Wachowiak A.S. Elmaghraby R. Smolikova J.M. Zurada Computer Science and Engineering Program University of Louisville Louisville KY USA Department of Computer Engineering and Computer Science University of Louisville Louisville KY USA Department of Electrical and Computer Engineering University of Louisville Louisville KY USA

ISBN: (纸本)0780370449

A neural-statistical approach to biomedical image interpolation using generalized regression neural networks is presented. These networks are basis function architectures that approximate any arbitrary function between input and output vectors directly from training samples, and with any desired degree of smoothness, and thus can be used for multidimensional interpolation. Experimental results compare favorably with other interpolation techniques. Because of their flexibility and ease of training, generalized regression networks can be used to complement existing approaches, and can be especially useful for post-registration image fusion and visualization.

关键词： Neural networks Biomedical imaging Interpolation Kernel Biomedical engineering Spline computer science Biomedical computing computer networks Visualization

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Achievement of essentially full spatial coherence in a high-average-power soft-x-ray laser

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Physical Review A 2001年第3期63卷 033802-033802页

作者： Y. Liu M. Seminario F. G. Tomasel C. Chang J. J. Rocca D. T. Attwood Applied Science and Technology Graduate Program University of California Berkeley California 94720 Center for X-ray Optics Lawrence Berkeley National Laboratory Berkeley California 94720 Department of Electrical and Computer Engineering Colorado State University Fort Collins Colorado 80523 Department of Electrical Engineering and Computer Science University of California Berkeley California 94720

We report an observation of essentially full spatial coherence in a high average power soft-x-ray laser. Rapid coherence buildup due to strong refractive antiguiding in a long plasma column is experimentally demonstrated. This allows the generation of fully coherent, milliwatt-level average power soft-x-ray radiation by a tabletop device. The peak brightness of this laser reaches 2×1025photonss−1mm−2mrad−2 within 0.01% spectral bandwidth, making it one of the brightest soft-x-ray sources available.

关键词： .full spatial high average coherence buildup plasma column degree of spatial

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Design and performance of a distributed dynamic clustering algorithm for ad-hoc networks

Design and performance of a distributed dynamic clustering a...

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Annual Symposium on Simulation

作者： A.B. McDonald T.F. Znati Department of Electrical and Computer Engineering Northeastern University Boston MA USA Department of Computer Science Telecommunica.tions Program University of Pittsburgh Pittsburgh PA USA

ISBN: (纸本)0769510922

Routing in ad-hoc networks is a difficult challenge that involves a tradeoff between efficiency and responsiveness. An ad-hoc network routing algorithm must adapt rapidly enough to topology changes to meet the performance demands of users, without over-utilizing network resources. This paper presents the (/spl alpha/,t) cluster framework which utilizes a distributed dynamic clustering strategy to organize nodes into clusters in which the probability of path failure due to node movement can be bounded over time. The objective of the clustering strategy is to achieve scalability and support robust, efficient routing subject to a wide range of mobility rates. Based on the (/spl alpha/,t) cluster scheme, routes within clusters are maintained on a proactive basis, whereas hierarchical routing between clusters is managed on a demand-basis. Simulation results show that the cluster organization can be effectively adapted to node mobility and that routing is both more robust and efficient than routing in fully proactive, reactive or fixed-hybrid schemes.

关键词： Algorithm design and analysis Clustering algorithms Heuristic algorithms Routing Ad hoc networks Network topology Robustness Telecommunication traffic Delay Telecommunication network topology

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A magnetically damped momentum transfer device to reduce chatter in a micro-mechanical switch

A magnetically damped momentum transfer device to reduce cha...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： B. Chaudhuri K. Fischer H. Guckel Materials Science Program University of Wisconsin Madison WI USA Department of Electrical and Computer Engineering University of Wisconsin Madison WI USA

ISBN: (纸本)0780359984

A micro-mechanical switch has been designed and fabricated in which the bounce after contact closure has been reduced by using mechanical momentum transfer and magnetic damping, while maintaining high contact forces. The period of chatter has been reduced from 1.5 milliseconds to less than 0.3 milliseconds, while the switching speed is 5 millisecond. The switch has been fabricated using Permalloy (78% Ni and 22% Fe) and copper. The LIGA process was used in the fabrication of the switch. An improved copper process allowed the fabrication of high aspect ratio (20:1) structures which were subsequently freed and assembled.

关键词： Magnetic devices Magnetic moments Switches Contacts Copper Fabrication Magnetic switching Damping Iron Assembly

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Design of gyroscope-free navigation systems

Design of gyroscope-free navigation systems

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International Conference on Intelligent Transportation

作者： Chin-Woo Tan S. Park K. Mostov P. Varaiya Partners for Advanced Transit and Highways PATH Program University of California Berkeley USA Department of Electrical Engineering and Computer Science University of California Berkeley USA

We examine the feasibility of designing a gyroscope-free inertial navigation system (INS) that uses only accelerometers to compute the linear and angular motions of a rigid body. The accelerometer output equation is derived to relate the linear and angular motions of a rigid body relative to a fixed inertial frame. A sufficient condition is given to determine if a configuration of accelerometers is feasible. If the condition is satisfied, the angular and linear motions can be computed separately using two decoupled equations of an input-output (I/O) dynamical system; a state equation for angular velocity and an output equation for linear acceleration. This simple computation scheme is derived from the corresponding dynamical system equations for a special cube configuration for which the angular acceleration is expressed as a linear combination of the accelerometer outputs.

关键词： Gyroscopes Accelerometers Equations Acceleration Inertial navigation Angular velocity Sufficient conditions Aircraft navigation Rotation measurement Automobiles

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Segmentation and analysis of leg ulcers color images

Segmentation and analysis of leg ulcers color images

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International Workshop on Medical Imaging and Augmented Reality

作者： A.A. Perez A. Gonzaga J.M. Alves Computer Vision Laboratory Department of Electrical Engineering School of Engineering of São Carlos University of São Paulo Sao Paulo Brazil Department of Materials Aeronautic and Automotive Engineering School of Engineering of São Carlos University of São Paulo Bioengineering Graduate Program Sao Paulo Brazil

ISBN: (纸本)0769511139

This paper presents a methodology for the segmentation and analysis of the tissues in color images of leg ulcers. The segmentation is obtained through an automatic analysis made in the RGB and SI channels by changing from the RGB color space to the HSI color space. The aim is to determine which of the five channels have the characteristic that will make the segmentation process more efficient. After the analysis, the selected channel is segmented and used as a mask over the original image, allowing that only the inner tissues of the wound be analyzed. The analysis is done through predetermined functions that attribute membership grade for each processed pixel as well as its level of engagement in a specified tissue class. The article also shows the results obtained from both the segmentation and analysis of tissues using the proposed method.

关键词： Image segmentation Image analysis Image color analysis Leg Wounds Cameras Automotive engineering Colored noise Monitoring Video compression

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An information architecture for physiological models, clients and databases

An information architecture for physiological models, client...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： C.F. Dewey B. Fu S. Zhang N. Dao W. Chuang Z. Li Mechanical Engineering Massachusetts Institute of Technology Cambridge USA Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge USA Health Sciences and Technology Massachusetts Institute of Technology Cambridge USA Department of Bioengineering University of Washington Seattle USA

Proposes an information system to support complex physiological information models. The system architecture requires three essential parts: a networked client that generates a request for information; a computation server that performs the calculation; and a model database that provides detailed parameters to the computation server to facilitate solution. The model database is organized as an object-oriented hierarchy following the design used to store medical images and their metadata in accordance with the international DICOM standard for medical images. A fourth critical component is also defined: a case database that archives the input data that has been used by the client to define the case to be computed, and archives the output from the solution. This system is applied to a complex contemporary model of the electrophysiology of cardiac myocyte cells.

关键词： Object oriented modeling computer architecture Biological system modeling Biology computing Image databases Object oriented databases Biomedical imaging DICOM Power system modeling computer networks

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Reflections on a candidate design of the user-interface for a wireless vital-signs monitor 00

Reflections on a candidate design of the user-interface for ...

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2000 Conference on Designing Augmented Reality Environments, DARE 2000

作者： McGarry, Ben Matthews, Ben Brereton, Margot Information Environments Program Department of Computer Science and Electrical Engineering University of Queensland St Lucia BrisbaneQLD4000 Australia

ISBN: (纸本)9781450373265

In this paper we present a case study of our candidate design for the user-interface of a wireless vital-signs monitor. We reflect on our design of the user-interface, and relate our design experience to theories of artefact design, evaluating from this case study how the theories apply to the broader design context of design for AR. Theories of 'good design' in artefact design literature do not unilaterally apply to the design for an augmented reality device. In many cases, design in AR fields requires the designer to create new cultural conventions by virtue of the fact that the designer is immersing the user in an unfamiliar environment. Thus, the designer is often unable to utilise affordances and existing cultural conventions because the functions and/or use of the object expands the environment in which affordances and cultural conventions currently have meaning. Copyright 2000 ACM.

关键词： User interfaces

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