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Passive and active glass waveguide devices utilizing silicon overlay grating

Passive and active glass waveguide devices utilizing silicon...

引用

Integrated Photonics Research, IPR 2002

作者： Kim, Jaeyoun Winick, Kim A. Florea, Catalin Department of Electrical Engineering and Computer Science University of Michigan 1301 heal Avenue Ann ArborMI48109 United States Applied Physics Program University of Michigan 1301 heal Avenue Ann ArborMI48109 United States

Bragg gratings fabricated on top of ion exchanged glass waveguides using PECVD-deposited silicon overlays are reported. The resulting Bragg gratings are characterized and transmission dips at 1536 nm in excess of 18 d... 详细信息

ISBN: (纸本)1557527229

关键词： Bragg gratings

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Automated algorithm to delineate Z-bands in electron microscopic images of the human skeletal muscle

Automated algorithm to delineate Z-bands in electron microsc...

引用

IEEE International Symposium on Biomedical Imaging, ISBI 2002

作者： Guo, Yu Sun, Ying Manfredi, Thomas G. Department of Electrical and Computer Engineering University of Rhode Island 4 East Alumni Avenue KingstonRI02881 United States Exercise Science Program University of Rhode Island 4 East Alumni Avenue KingstonRI02881 United States

ISBN: (纸本)078037584X

The effects of exercise, nutrition, and aging on the development of human skeletal muscles can be observed from the morphological changes of the Z-band under the electron microscope. Quantification of the Z-band damage has provided useful information to exercise physiology research but is usually a labor-intensive process. In this study, an automated image-processing algorithm has been developed to delineate the Z-band with a given start point. The algorithm detects the borders of the Z-band in an incremental fashion along the long axis. At each step of the iteration local border points are detected along radial directions and the centerline is extended toward both ends of the Z-band. The process iterates itself until a stopping criterion is met. The algorithm has been coded in C++ and used in our laboratory for exercise science research. The software has significantly reduced the processing time and provided reliable high-quality data for the study of Z-band damage. © 2002 IEEE.

关键词： Iterative methods

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Performance of a space-time block coded OFDM system

Performance of a space-time block coded OFDM system

引用

Asilomar Conference on Signals, Systems & computers

作者： Jiang Yue J.D. Gibson Department of Electrical Engineering School of Engineering Southern Methodist University Dallas TX USA Media Arts Technology Program and Electrical & Computer Engineering University of California Santa Barbara CA USA

Combined with antenna diversity, space-time coding is an attractive candidate for high-rate transmission systems such as orthogonal frequency division multiplexing (OFDM) systems. We propose space-time block coded OFDM systems that use training symbols coded by STBC. We use two training symbols at the beginning of each of two OFDM frames that are simultaneously transmitted from two corresponding transmit antennas. Based on the orthogonality of space-time block codes, we perform channel estimation by using training symbols, and compare to EM-based channel estimation methods. From the simulation results, we observe that our space-time block coding technique offers a good approach to channel estimation and better signal quality than the EM-based method.

关键词： OFDM Channel estimation Transmitting antennas Block codes Transmitters Diversity reception Fading Frequency conversion PROM Diversity methods

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Range extension and short range performance enhancement in TDMA digital cellular

Range extension and short range performance enhancement in T...

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Asilomar Conference on Signals, Systems & computers

作者： Bo Wei J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Media Arts Technology Program and Electrical & Computer Engineering University of California슠Santa Barbara Santa Barbara CA USA

A new system enhancement method is proposed for the EIA/TIA-136 system offering both channel operational range extension and improved performance within the current operational range. The research presented investigates the application of the narrowband adaptive multi-rate (NB-AMR) speech codec and the wideband AMR (WB-AMR) codec, both originally designed for the 200 kHz GSM channel, in the TDMA (TIA/EIA-136) 30 kHz system. In particular, we investigate adaptively allocating bits between NB/WB speech coding and error control within the limited channel bandwidth. Four modes out of seventeen have been carefully chosen for the new TDMA/AMR system. Switching between codec rates as channel conditions change produces range extension below a C/I of 15 dB while also improving performance in the existing operational range above 15 dB. Time slot formats are unchanged so that the method is completely compatible with existing 136 systems.

关键词： Time division multiple access Speech codecs Speech coding Bit rate Channel coding Wideband Protection Degradation Fading Telecommunication standards

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Potential benefits of implementing load control

Potential benefits of implementing load control

引用

IEEE Winter Meeting Power engineering Society

作者： M. Ilic J.W. Black J.L. Watz Department of Electrical Engineering and Computer Science MIT Cambridge MA USA Engineering Systems Division in the Technology Management and Policy Program MIT Cambridge MA USA Engineering Systems Division in the Technology and Policy Program MIT Cambridge MA USA

ISBN: (纸本)0780373227

The design of wholesale electricity markets through deregulation has focused almost exclusively on the development of competitive supply (generation). The demand side of the market has been virtually ignored. Mostly, this is due to the assumption that electricity demand is almost completely inelastic. As a result, deregulated wholesale markets universally fail to pass price signals down to the end-users. This paper challenges the assumption of inelastic demand by exploring the potential benefits of implementing a simple load control scheme. This load control scheme allows consumers to shift demand from high priced hours to low priced hours during the day. The benefits to the individual consumer are explored through an example applied to residential air conditioning using price and demand data from California. This example shows that "smart" use of air conditioning can lead to great savings for residential consumers, without sacrificing comfort. The potential for multiple consumers implementing load control to reduce wholesale prices is also examined.

关键词： Load flow control Aggregates Electricity supply industry Power generation Electricity supply industry deregulation Air conditioning Energy management Energy consumption Power engineering and energy Systems engineering and theory

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Locating an affine/projective invariant identifier patch on an image

Locating an affine/projective invariant identifier patch on ...

引用

IEEE Southwest Symposium on Image Analysis and Interpretation

作者： B.N. Araabi N. Kehtarnavaz M. Yeary G. Hillman B. Wursig Department of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Electrical Engineering University of Texas Dallas TX USA Department of Electrical Engineering Texas A and M University College Station TX USA Medical Branch University of Technology Galveston TX USA Marine Mammal Research Program Texas A and M University Galveston TX USA

ISBN: (纸本)0769515371

Single view recognition is encountered in many photo-identification applications. Often a query image is retrieved by searching a database of previously identified images. Important markings and patterns are often located in a particular area of the object. This paper presents a method to locate an invariant patch on an image using few points in correspondence and few invariant ratios. Computation of ratios is simple and intuitive both geometrically and analytically. Once ratios are computed for an appropriate multilateral patch, the same ratios can be used on other images to locate the same identifier patch. In particular, this method is deployed to obtain the same area of interest on spotted dolphins.

关键词： Dolphins Cameras Image databases Information retrieval Image retrieval Spatial databases Image analysis Biomedical imaging Image recognition Seals

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The importance of nonlinear order in modeling intermodulation distortion and spectral regrowth

The importance of nonlinear order in modeling intermodulatio...

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IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： K.M. Gharaibeh K. Gard H. Gutierrez M.B. Steer Department of Electrical and Computer Engineering North Carolina State University Raleigh USA Qualcomm CDMA Technologies Inc. Diego USA Mechanical Engineering Program Florida Institute of Technology Melbourne USA

Modeling of distortion in nonlinear RF and microwave amplifiers requires high order nonlinear modeling to capture behavior with digitally modulated signals but only low order modeling to capture the response with discrete spectra as in two-tone testing. This paper establishes model order requirements for successful behavioral modeling for system explorations.

关键词： Intermodulation distortion Digital modulation Nonlinear distortion Radiofrequency amplifiers RF signals Radio frequency Testing Distortion measurement Signal processing Strontium

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OpenMP Parallel Implementation of Finite Difference Time Domain Electromagnetism Application

OpenMP Parallel Implementation of Finite Difference Time Dom...

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2002 International Symposium on Distributed Computing and Applications for Business engineering and Science

作者： Joseph W.Haus Majeed M.Hayat Electro-Optics Program The University of Dayton Dayton OH45469-0245 Department of Electrical & Computer Engineering The University of New Mexico Albuquerque NM87131-1356

We report the OpenMP parallel implementation of a finite difference time domain (FDTD) method for computational electrodynamics. We have identified several time-intensive procedures in the program and parallelized the major loops within them after careful examination. Different loop scheduling schemes have been used and tested in order to reduce computation times. The final parallelized version speeds up the computation by nearly a factor of four between the single processor and eight processor test runs on an SGI Origin 2000 parallel system. The speedup plateaus after eight CPUs, but we expect better scalability will be achieved if larger problem sizes are used. Besides the advantage of reduced execution times, our parallel program can also solve FDTD problems of much larger sizes than the sequential code due to much larger memory space available to us on parallel systems.

关键词： domain OpenMP Parallel Implementation of Finite Difference Time Domain Electromagnetism Application

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A bioMEMS sensor platform based on a cantilever with a precisely patterned environmentally sensitive hydrogel

A bioMEMS sensor platform based on a cantilever with a preci...

引用

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

作者： J.Z. Hilt A.K. Gupta R. Bashir N.A. Peppas NSF IGERT Program on Therapeutic & Diagnostic Devices Purdue Univ. West Lafayette IN USA School of Electrical & Computer Engineering West Lafayette USA Department of Biomedical Engineering Purdue University West Lafayette USA

A novel photolithography process was utilized to precisely align and pattern environmentally sensitive hydrogels onto silicon microcantilevers, after microcantilevers were fabricated and released. By patterning environmentally sensitive hydrogels onto silicon microcantilevers, an ultrasensitive pH microsensor was prepared for MEMS and bioMEMS applications. Specifically, a crosslinked poly(methacrylic acid) network containing significant amounts of poly(ethylene glycol) dimethacrylate was studied. This hydrogel exhibits a swelling dependence on pH. Hydrogels were patterned onto the silicon microcantilevers utilizing a mask aligner to allow for precise positioning. Via modification of the silicon surface with /spl gamma/-methacryloxypropyl trimethoxysilane, covalent adhesion was gained between the polymer and the silicon surface. The micropatterned hydrogels were analyzed using optical microscopy and profilometry. The bending response of patterned cantilevers with a change in environmental pH was observed, providing proof-of-concept for a MEMS/bioMEMS sensor based on microcantilevers patterned with environmentally sensitive hydrogels.

关键词： Biosensors Silicon Micromechanical devices Optical microscopy Lithography Microsensors Adhesives Biomedical optical imaging Optical polymers Optical sensors

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Neural estimation of scatterer density in ultrasound

Neural estimation of scatterer density in ultrasound

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International Joint Conference on Neural Networks (IJCNN)

作者： R. Smolikova M.P. Wachowiak G.D. Tourassi J.M. Zurada Institute for Research and Applications of Fuzzy Modeling University of Ostrava Ostrava Czech Republic Computer Science and Engineering Program University of Louisville Louisville KY USA Department of Radiology Duke University Medical Center Durham NC USA Department of Electrical and Computer Engineering University of Louisville Louisville KY USA

Ultrasonic backscatter can provide information on the density of scatterers within biological media, and is therefore an important tool in tissue characterization. In this paper, a novel neural network approach to estimate scatterer density from generalized entropy is proposed. Neural estimation compares favorably with nonlinear least-squares models.

关键词： Ultrasonic imaging Rayleigh scattering Acoustic scattering Entropy Backscatter Signal to noise ratio Biomedical engineering Biomedical imaging Biological system modeling Ultrasonic transducers

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