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2009 IEEE Global Telecommunications Conference, GLOBECOM 2009

作者： Lin, Hui-Tang Lin, Ying-You Chang, Wang-Rong Chen, Song-Ming Institute of Computer and Communication Engineering National Cheng Kung University Taiwan Department of Electrical Engineering National Cheng Kung University Taiwan ICT-Enabled Healthcare Program Industrial Technology Research Institute-South Taiwan

ISBN: (纸本)9781424441488

An integrated EPON/WiMAX network has been an attractive attention due to its features of achieving stable backhaul transmissions to WiMAX users and reducing the expenditure of network deployment. In implementing such a network, realizing a scheduling mechanism capable of sharing the available bandwidth between the heterogeneous Ethernet and WiMAX traffic in an effective manner is problematic. In the present study, this problem is addressed by using a game-theoretic-based scheme comprising a bankruptcy game and a bargaining game to perform an intra-ONU scheduling function at each ONU within the network. In the proposed approach, each ONU distributes the total amount of bandwidth allocated by the OLT between the Ethernet and WiMAX traffic buffers in accordance with the results of the bankruptcy game. By applying bargaining games, the allocated bandwidth is then further distributed to the different traffic classes within the Ethernet or WiMAX traffic in accordance with their QoS requirements. The simulation results confirm the validity and effectiveness of the proposed approach.

关键词： Ethernet

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Ontology engineering

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Nature Biotechnology 2010年第2期28卷 128-130页

作者： Alterovitz, Gil Xiang, Michael Hill, David P. Lomax, Jane Liu, Jonathan Cherkassky, Michael Dreyfuss, Jonathan Mungall, Chris Harris, Midori A. Dolan, Mary E. Blake, Judith A. Ramoni, Marco F. Children's Hospital Informatics Program Harvard-MIT Division of Health Sciences and Technology Harvard Medical School Boston MA United States Partners Healthcare Center for Personalized Genetic Medicine Boston MA United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA United States Jackson Laboratory Bar Harbor ME United States EMBL-EBI Wellcome Trust Genome Campus Hinxton United Kingdom Department of Biology Massachusetts Institute of Technology Cambridge MA United States Lawrence Berkeley National Laboratory Berkeley CA United States

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Understanding quantification of microvascularity with high-frequency power Doppler ultrasound

Understanding quantification of microvascularity with high-f...

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Medical Imaging 2009: Ultrasonic Imaging and Signal Processing

作者： Pinter, Stephen Z. Lacefield, James C. Biomedical Engineering Graduate Program Departments of Electrical University of Western Ontario London ON Canada Department of Electrical and Computer Engineering University of Western Ontario London ON Canada Department of Medical Biophysics University of Western Ontario London ON Canada Robarts Research Institute University of Western Ontario London ON Canada

ISBN: (纸本)9780819475169

High-frequency power Doppler imaging of angiogenesis can be challenging given the presence of small blood vessels and slow flow velocities. In the presence of substantial Doppler artifacts such as false-positive color pixels or undetected vessels, color pixel density (CPD) and related vascularity metrics do not provide accurate estimates of vascular volume fraction. As a step towards improved microvascular quantification, flow-phantom experiments were performed to establish relationships between CPD and wall filter cut-off velocity for various combinations of vessel size (160, 200, 250, 300, and 360 μm), flow velocity (4, 3, 2, 1, and 0.5 mm/s), and transducer frequency (30 and 40 MHz). Three distinct regions were observed in plots of CPD versus wall filter cut-off velocity: overestimation of CPD at low cut-offs, underestimation of CPD at high cut-offs, and a plateau at intermediate cut-offs. The CPD at the plateau closely matched the phantom's actual vascular volume fraction. The length of the plateau corresponded with the flow-detection performance of the Doppler system, which was assessed using receiver operating characteristic analysis. Color pixel density versus wall filter cut-off curves from analogous in vivo experiments exhibited the same shape, including a distinct CPD plateau. The similar shape of the flow-phantom and in vivo curves suggests that the presence of a plateau can be used to identify the best-estimate CPD value in an in vivo experiment. The ability to identify the best CPD estimate is expected to improve quantification of angiogenesis and anti-angiogenic treatment responses with power Doppler. © 2009 SPIE.

关键词： Flow velocity

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Fiber-to-bundle registration of white matter tracts

Fiber-to-bundle registration of white matter tracts

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Medical Imaging 2009 - Image Processing

作者： Xu, Qing Anderson, Adam W. Gore, John C. Ding, Zhaohua Vanderbilt University Institute of Imaging Science United States Department of Electrical Engineering and Computer Science Vanderbilt University United States Department of Biomedical Engineering Vanderbilt University United States Chemical and Physical Biology Program Vanderbilt University United States

ISBN: (纸本)9780819475107

Magnetic resonance diffusion tensor imaging (DTI) is being widely used to reconstruct brain white matter (WM) fiber tracts. For further characterization of the tracts, the fibers with similar courses often need to be grouped into a fiber bundle that corresponds to certain underlying WM anatomic structure. In addition, the alignments of fibers from different studies are often desirable for bundle comparisons and group analysis. In this work, a novel registration algorithm based on fiber-to-bundle matching was proposed to address the above two needs. Using an Expectation Maximization (EM) algorithm, the proposed method is capable of estimating a Thin-Plate- Spline transformation that optimally aligns whole-brain target fiber sets with a reference bundle model. Based on the resulting transformations, the fibers from different target datasets can all be warped into the reference coordinate system for comparisons and group analysis. The fibers can be further automatically labeled according to their similarity to the reference model. The algorithm was evaluated with eight human brain DTI data volumes acquired in vivo at 3T. After registration, the warped target bundles exhibit good similarity to the reference bundles. Quantitative experiments further demonstrated that the detected target bundles agree with ground truth obtained by manual segmentation at a sub-voxel accuracy. © 2009 Copyright SPIE - The International Society for Optical engineering.

关键词： Fibers

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Autonomous microfluidic sensing device employing liquid crystal for detection of biological interactions

Autonomous microfluidic sensing device employing liquid crys...

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TRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems

作者： Cheng, D. Lin, I.H. Abbott, N.L. Jiang, H. Materials Science Program University of Wisconsin-Madison Madison WI United States Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI United States Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI United States

ISBN: (纸本)9781424441938

We report the design of an autonomous sensing device, which employs a thermotropic nematic liquid crystal (LC) to conduct chemical or biological sensing tasks. The development of highly reproducible methods to create uniform LC thin film is critical for utilizing LCs for sensing. Herein, we describe the use of shear forces generated by the laminar flow of liquid within a microfluidic channel to create thin LC films stabilized within microfabricated structures. The orientational response of the supported LC films to targeted analytes in aqueous phases was observed through changes in the optical birefringence of the LC thin films. Experiments employing two systems are reported: (i) dodecyl trimethylammonium bromide (DTAB) dissolved in aqueous solution, and (ii) the hydrolysis of phospholipids by the enzyme phospholipase A2 (PLA2). ©2009 IEEE.

关键词： Phospholipids

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Effect of nitrogen concentration on nanodiamond film characteristics for electrode application

Effect of nitrogen concentration on nanodiamond film charact...

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作者： Raina, Supil LeQuan, X.C. Kang, W.P. Davidson, J.L. Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States

ISBN: (纸本)9781607681137

Microwave plasma chemical vapor deposition was used to fabricate nanodiamond films. Nitrogen incorporation was achieved by the introduction of N2 gas along with H2 and CH4 gases in the plasma. SEM studies revealed a change in the microstructure with increase in the N2 flow rate, transitioning from a 'ridge'-like surface morphology to a more 'cauliflower'-like structure. X-ray photoelectron spectroscopy (XPS) analysis showed a general decrease in the sp3 hybridized carbon content while the sp hybridized carbon content increased with N2 flow rate (up to 28.7%) after which it declines. Deconvolution of the C1s XPS spectra indicates incorporation of nitrogen and existence of carbon-nitrogen bonding. Raman spectroscopy shows diamond peak at 1332 cm-1 and the graphite peak, which increases in intensity and shifts towards lower wave number with increase in the N2 flow rate. A diffuse band at 1140 cm -1 indicates presence of a nanocrystalline phase in the films. ©The Electrochemical Society.

关键词： Nitrogen

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Use of a step-response approximation for thermal transient modeling in power MOSFETs

Use of a step-response approximation for thermal transient m...

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74th ARFTG Microwave Measurement Conference - System Modeling and Measurement for High Accuracy Verification

作者： Baylis, Charles Perry, Joseph Moldovan, Matthew Marks II, Robert J. Dunleavy, Lawrence Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX 76798 United States Center for Wireless and Microwave Information Systems Department of Electrical Engineering University of South Florida Tampa FL 33620 United States Modelithics Inc. Tampa FL 33612 United States

ISBN: (纸本)9781424457137

In a previous ARFTG paper, we presented the measurement of the thermally-induced transient drain voltage response of a power Si MOSFET to a step excitation in gate voltage. The data was fit by assuming the drain voltage takes an exponential shape. This relies on the assumption that the drain current is a step function, which is actually only approximate due to the dependence of the drain current on temperature. In this work, we show that the exponential approximation actually possesses the same asymptotic behavior of a more accurate, model-based solution we have obtained that incorporates thermal feedback. We show that the more theoretically accurate solution and exponential approximation of the solution both provide excellent fits to measured data for the Si MOSFET. © 2009 IEEE.

关键词： Power MOSFET

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Determination of thermal parameters of nanostructures exhibiting one-dimensional heat flow through a thermal transient method

Determination of thermal parameters of nanostructures exhibi...

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2009 MRS Spring Meeting

作者： Arriagada, Anton Yu, Edward T. Bandaru, Prabhakar R. Deparment of Electrical and Computer Engineering University of California at San Diego San Diego CA 92093-0407 United States Materials Science Program Mechanical Engineering Department University of California at San Diego San Diego CA 92093-0411 United States

ISBN: (纸本)9781615677832

We present an improved methodology for a thermal transient method enabling simultaneous measurement of thermal conductivity and specific heat of nanoscale structures with one-dimensional heat flow. The temporal response of a sample to finite duration heat pulse inputs for both short (1 ns) and long (5 μs) pulses is analyzed and exploited to deduce the thermal properties. Excellent agreement has been obtained between the recovered physical parameters and computational simulations. © 2009 Materials Research Society.

关键词： Specific heat

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Melody Line Detection and source separation in classical saxophone recordings

Melody Line Detection and source separation in classical sax...

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12th International Conference on Digital Audio Effects, DAFx 2009

作者： Cano C., Estefanía Cheng, Corey TU Ilmenau/ Fraunhofer Institute IDMT Ilmenau Germany Music Engineering Technology Program Frost School of Music University of Miami Coral Gables FL United States Department of Electrical and Computer Engineering University of Miami Coral Gables FL United States

We propose a system which separates saxophone melodies from composite recordings of saxophone, piano, and/or orchestra. The system is intended to produce an accompaniment sans saxophone suitable for rehearsal and practice purposes. A Melody Line Detection (MLD) algorithm is proposed as the starting point for a source separation implementation which incorporates known information about typical saxophone melody lines, acoustic characteristics and range of the saxophone in order to prevent and correct detection errors. By extracting reliable information about the soloist melody line, the system separates piano or orchestra accompaniments from the solo part. The system was tested with commercial recordings and a performance of 79.7% of accurate detections was achieved. The accompaniment tracks obtained after source separation successfully remove most of the saxophone sound while preserving the original nature of the accompaniment track.

关键词： Source separation

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The AMALTHEA REU program. Activities, experiences & outcomes of a collaborative summer research experience in machine learning

The AMALTHEA REU Program: Activities, experiences & outcomes...

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2009 ASEE Annual Conference and Exposition

作者： Anagnostopoulos, Georgios Georgiopoulos, Michael Kepuska, Veton Stanley, Kenneth Morrison-Shetlar, Alison Lancey, Pat Krist, Paula Crouse, Tace Electrical and Computer Engineering Department Florida Institute of Technology Melbourne FL United States AMALTHEA REU Program United States University of Central Florida United States School of EECS School of Electrical Engineering and Computer Science University of Central Florida United States Department of Biology University of Central Florida United States School of Leadership and Education Sciences University of San Diego United States

The AMALTHEA REU program.is a 10-week, summer research experience for science or engineering undergraduate students funded by the National Science Foundation since 2007 and featuring Machine Learning as its intellectual focus. Moreover, it is a joint effort of two collaborating universities in Central Florida, namely Florida Institute of Technology in Melbourne and University of Central Florida in Orlando. Organizing, implementing and directing REU Sites is typically perceived as a demanding effort;while offering unique advantages, operating collaborative sites may impose an additional layer of challenges. In this paper our intention is to present the objectives of our program. its unique characteristics, and the structure and organization of our collaborative site. Furthermore, we would like to give an informative account of our activities across the various aspects of the program. such as marketing of the experience, recruiting of student participants, the summer experience itself and our dissemination efforts. Finally, we report on our outcomes accomplished so far, which include research products and evaluation results. While our program.is only entering into its third year of operation, we do hope that, by sharing our experiences and promising strategies to date, we will encourage and aid prospective REU Site directors to successfully plan for and operate collaborative sites. © American Society for engineering Education, 2009.

关键词： Students

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