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2010 IEEE International Ultrasonics Symposium

作者： Nghia Q. Nguyen Craig K. Abbey Michael F. Insana Department of Electrical and Computer Engineering (ECE) University of Illinois at Urbana-Champaign Urbana IL 61801 Faculty of Department of Psychology University of California Santa-Barbara CA 93106 Faculty of Departments of Bioengineering and ECE Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL 61801

ISBN: (纸本)9781457703829

Wiener filters applied to channel-summed RF echo data was approximated to the ideal Bayesian beamforming strategy for imaging breast lesion features. They can be computed in real-time and perform well provided the system response matrix is circulant. Real systems exhibit depth-varying impulse responses, so performance degrades for some essential diagnostic features. This paper describes the effects of circulant assumption (CA) violations on the robustness of human visual discrimination efficiency, and the effects of regularization, as applied to beamformers for breast sonography. The Wiener filter is then adapted for shift-varying system responses. The trade off between performance and computation time for each approach is studied using simulations and phantoms scanned with a commercial system.

关键词： Beamforming breast sonography ideal observer image quality spatial filters Wiener filters approximation breast lesion beamformers Robustness system response circulation Bayesian inference Imaging Phantom Paranormal phenomena computational time

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electrical and microstructural properties of N+ ion-implanted ZnO and ZnO:Ag thin films

Electrical and microstructural properties of N+ ion-implante...

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第六届国际氧化锌及相关材料研讨会

作者： Michelle Myers Michael Myers Chen-Fong Tsai Joon Hwan Lee Department of Electrical and Computer Engineering Texas A&M University College Station TX 77843-3128 USA Department of Nuclear Engineering Texas A&M University College Station TX 77843-3128 USA Material Science and Engineering Program Texas A&M University College Station TX 77843-3128 USA

A systematic study to investigate the effectiveness of ion implanted N+ as a dopant for ZnO and a co-dopant in silver doped ZnO (ZnO:Ag, SZO) thin films was performed. ZnO and SZO films were grown on sapphire (0001)

关键词： ZnO electrical and microstructural properties of N ion-implanted ZnO and ZnO:Ag thin films

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The keyword-based and semantic-driven data matching approach for assisting structuralizing the textual clinical documents

The keyword-based and semantic-driven data matching approach...

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International Conference on BioMedical engineering and Informatics (BMEI)

作者： Chi-Huang Chen Xiao-Ou Ping Zi-Jun Wang Sheau-Ling Hsieh Li-Chin Chen Yi-Ju Tseng Ching-Wei Hsu Feipei Lai Department of Electrical Engineering National Taiwan University Taipei Taiwan Graduate Institute of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Graduate Institute of Biomedical Electronic and Bioinformatics National Taiwan University Taipei Taiwan EECS International Graduate Program Institute IT Center National Chiao Tung University Hsinchu Taiwan

The clinical data stored in the health information system can be categorized as two types including structuralized data and non-structuralized ones. In the paper, a data extraction system is developed to assist data retrieval from the non-structuralized textual clinical documents such as radiology reports, pathology reports, etc. The system provides keyword-based and semantic-driven data matching methodology to extract the specific information from the textual clinical documents. The matching methodology provides the capabilities to recognize the selected keywords and the related semantics in the documents. Through the extraction verification interface, clinicians can extract and verify the matched information semi-automatically. The extracted data can be filled into predefined case-oriented templates. The structuralized data can be stored back into the clinical data warehouse for further analyzing. Moreover, the case-oriented templates can support collecting corresponding extracted data for various researches.

关键词： Data mining Semantics Pattern matching Tumors Radiology Pathology Cancer

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Lee et al. reply(Note)

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Nature 2010年第7323期468卷 E4-E5页

作者： Lee, J.H. Durand, R. Gradinaru, V. Zhang, F. Goshen, I. Kim, D.-S. Fenno, L.E. Ramakrishnan, C. Deisseroth, K. a Dept. of Elec. Engineering Psychiatry and Biobehavioral Sciences Bioengineering and Radiology University of California Los Angeles CA 90095 United States b Department of Bioengineering Stanford University Stanford CA 94305 United States c Department of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 South Korea d Department of Anatomy and Neurobiology Boston University School of Medicine Boston MA 02118 United States e Howard Hughes Medical Institute Stanford University Stanford CA 94305 United States f CNC Program Stanford University Stanford CA 94305 United States g Department of Psychiatry and Behavioral Sciences Stanford CA 94305 United States

Replying to N. K. Logothetis 468, 10.1038/nature09532 (2010)This is a welcome opportunity to discuss ofMRI, a technology for testing the causal and global impact of defined cell populations in vivo. The accompanying Comment reviews well-known neuroanatomy, but does seem, in its entirety, to be founded on a suggestion that, after experiments were conducted to drive a defined circuit element and measure resulting BOLD signals, we concluded that no other contributory circuit element was recruited by the driven population. This was not the case, however, as correctly understood by others in the fMRI community and as explained in the paper (for example, 'contributions from additional cells and processes downstream of the defined optically triggered population are expected and indeed represent an important aspect of this approach'). Moreover, the complexity of the brain dictates that such possible contributory mechanisms are more numerous than listed in the Comment, including many other circuit and feedback mechanisms and classes of cells within neural circuitry. As was discussed, this is one of the most important and useful aspects of the ofMRI approach. [ABSTRACT FROM AUTHOR]

关键词： Functional magnetic resonance imaging

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An on-line pulse trains analysis system of the wire-EDM process

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Journal of Materials Processing Technology 2009年第9期209卷 4417-4422页

作者： Liao, Y.S. Cheng, M.P. Liao, K.W. Department of Mechanical Engineering National Taiwan University Taiwan Electrical Engineering and Computer Science Undergraduate Honors Program National Chiao Tung University Taiwan

Ignition delay time (Td) has been widely used to distinguish the abnormal discharges from the normal ones in wire electrical discharge machining (WEDM) process. In this paper an on-line analysis system for the causality of the Td data sequences was developed to evaluate the machining performance of WEDM process. The system is composed of a stand-alone Td processing circuitry and a user-friendly computer program for data analysis. The Td processing circuitry calculates and records the Td of every single electrical discharge in the first place, and then transmits the Td data via an embedded communication port to a desktop or notebook computer. The computer program, after performing the analysis tasks, will display the result in a graphic way. Two mathematical algorithms were employed for the analysis: autocorrelation function and Fourier transform. Through experiments under different working conditions, it was found that the autocorrelation function could be used to detect if arc or short circuit discharges take place consecutively, and to distinguish the WEDM process with similar Td distributions. On the other hand, the spectral analysis revealed that several factors were identified to be able to induce certain periodic patterns of Td data. These factors include the length of wire electrode, the water pressure, etc. © 2008 Elsevier B.V. All rights reserved.

关键词： Spectrum analysis

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Integrated use of artificial neural networks and genetic algorithms for problems of alarm processing and fault diagnosis in power systems

Integrated use of artificial neural networks and genetic alg...

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2010 Asian Conference on Intelligent Information and Database Systems, ACIIDS 2010

作者： Fritzen, Paulo Cícero Cardoso Jr., Ghendy Zauk, João Montagner De Morais, Adriano Peres Bezerra, Ubiratan H. Beck, Joaquim A. P. M. Federal Institut of Education Science and Tecnology of Tocantins Campus Palmas IFTO Avenue LO 5 Block AE 310 South Palmas Tocantins 77021-090 Brazil Federal University of Santa Maria Eletrical Engineering Pós-Graduate Program UFSM Avenue Roraima 1000 Santa Maria Rio Grande do Sul 97105-900 Brazil Federal University of Pará Department of Electrical Engineering and Computer Street Augusto Corrêa 01 Guamá 66075-110 Belém Pará Brazil Centrais Elétricas Do Norte Do Brasil S/A Eletronorte Quarter 06 Set A B and Block C Asa Norte 70.716-901 Brasília DF Brazil

ISBN: (纸本)3642121446

This work approaches relative aspects to the alarm processing problem and fault diagnosis in system level, having as purpose filter the alarms generated during a outage and identify the equipment under fault. A methodology was developed using Artificial Neural Networks (ANN) and Genetic Algorithms (GA) in order to resolve the problem. This procedure had as initiative explore the GA capacity to deal with combinatory problems, as well as the ANN processing speed and generalization capacity. Such strategy favors a fast and robust solution. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Neural networks

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Biology-inspired sensor design

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IEEE Potentials 2009年第6期28卷 19-24页

作者： Stroble, Jacquelyn K. Watkins, Steve Stone, Robert American Institute of Physics Discoveries Breakthroughs Inside Science Program United States Department of Electrical and Computer Engineering Applied Optics Laboratory Missouri University of Science and Technology United States Mechanical Industrial and Manufacturing Engineering Department Oregon State University United States

Biology has played a key role in influencing the development and optimization of a significant variety of sensors that provide engineers new ideas for improvements to current technology, new sensor technology, and potential sensor miniaturization. Biological systems, such as plants and insects offer significant methods of flight, imaging, sensing, adaptation to environment, and locomotion. The biological domain provides inspiration at many levels, such as cellular, organism, and species. A biological system is any biological organism, organism subsystem, or portion of an organism that is observed to exist. Abstraction of the biological system using analogical reasoning allows an engineering designer to look for a specific solution through mimicry in an approach to biology-inspired design. The analogous approach relies on the idea of figuring out the basis of overall biological system and of each part or subsystem that achieves the overall goal.

关键词： Biological systems

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Carbon nanostructures as thermal field emitters for waste heat recovery

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Diamond and Related Materials 2009年第2-3期18卷 563-566页

作者： Wong, Y.M. Kang, W.P. Davidson, J.L. Raina, S. Huang, J.H. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Program in Material Science Vanderbilt University Nashville TN 37235 United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

Traditional vacuum-based thermal energy conversion (VTEC) devices with "flat" metal emitters have been compromised by high working temperature mainly due to high work function and electron space charge effect. However, a VTEC system is inherently efficient due to unimpeded flow of electrons through vacuum and reduction of heat conduction by the vacuum medium. Consequently, VTEC devices are attractive in terms of space, weight and energy efficiency for waste heat recovery in a TEC system. Carbon nanostructured emitters including multiwalled carbon nanotubes (CNTs) and "ridge" nanodiamond thin films have shown relatively low threshold fields for electron field emission mainly due to their nanoscaled, high aspect ratio, emitting surfaces. In this study, the field-enhancing features of carbon nanostructures were investigated as thermal-field emitters for waste heat recovery. The turn-on field of CNTs was found to decrease from ~ 1.9V/μm at room temperature to ~ 0.9V/μm at 400°C. A high emission current of ~ 26μA was achieved at relatively low field of ~ 1.5V/μm and low temperature of 400°C. The maximum efficiency of the VTEC device is estimated to be ~ 15% at 300°C with a current density of 54mA/cm2. © 2008 Elsevier B.V.

关键词： Temperature

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A parallel spiking neural network simulator

A parallel spiking neural network simulator

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2009 International Conference on Field-programmable Technology, FPT'09

作者： Cheung, Kit Schultz, Simon R. Leong, Philip H. W. Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Department of Bioengineering Imperial College London United Kingdom Department of Electrical and Information Engineering University of Sydney Australia

ISBN: (纸本)9781424443772

An FPGA-based systolic architecture for the high speed simulation of spiking neural networks is presented. The design is an implementation of Izhikevich's neuron model and employs optimizations for the typical case where neuron activity is low. Since execution time required is related to the activity level, performance of the design can be improved by an order of magnitude. © 2009 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Protocol for obtaining noise-immune absolute ellipsometric measurements with high spatial resolution

Protocol for obtaining noise-immune absolute ellipsometric m...

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Frontiers in Optics, FiO 2009

作者： Tripathi, Santosh Toussaint, Kimani C. Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign IL 61820 United States Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign IL 61820 United States Departments of Electrical and Computer Engineering and Bioengineering University of Illinois Urbana-Champaign IL 61820 United States

A protocol that utilizes Stokes parameters and inverse methods for obtaining noise immune absolute ellipsometric measurements with high spatial resolution is proposed. It is applicable for arbitrary scalar and vector ... 详细信息

ISBN: (纸本)9781557528780

关键词： Inverse problems

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