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Devising adaptive migration policies for cooperative distributed genetic algorithms

Devising adaptive migration policies for cooperative distrib...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： E. Noda A.L.V. Coelho I.L.M. Ricarte A. Yamakami A.A. Freitas School of Electrical and Computer Engineering (FEEC) UNICAMP-State University of Campinas Brazil Postgraduate Program in Computer science Pontifical Catholic University of Paraná Brazil

Distributed genetic algorithms (DGAs) constitute an interesting approach to undertake the premature convergence problem in evolutionary optimization. This is done by spatial partitioning a huge panmitic population into several semi-isolated groups, called demes, each evolving in parallel by its own pace, and possibly exploring different regions of the search space. At the center of such approach lies the migratory process that simulates the swapping of individuals belonging to different demes, in such a way to ensure the sharing of good genetic material. In this paper, we model the migration step in DGAs as an explicit means to promote cooperation among genetic agents, autonomous entities encapsulating GA instances for possibly tackling different sub-problems of a complicated task. The focus is on the characterization of adaptive migration policies in which the choice of what individuals to migrate and/or replace is not defined a priori but according to a more knowledge-oriented rule. Comparative results obtained for a data-mining task were conducted, in order to assess the performance of adaptive migration according to efficiency/effectiveness criteria.

关键词： Genetic algorithms Identity-based encryption Inductors Search engines Dissolved gas analysis Parallel architectures Cloning

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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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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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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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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...

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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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Proposed framework for applying adaptive critics in real-time realm

Proposed framework for applying adaptive critics in real-tim...

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International Joint Conference on Neural Networks (IJCNN)

作者： G.G. Lendaris R.A. Santiago M.S. Carroll Systems Science and of Electrical & Computer Engineering Northwest Computational Intelligence Laboratory Portland State University Portland OR USA Systems Science Program Northwest Computational Intelligence Laboratory Portland State University Portland OR USA

Adaptive critics have shown much promise for designing optimal nonlinear controllers in an off-line context. Still, their greatest potential exists in the context Of reconfigurable control, that is, real time controller redesign in response to (substantial) changes in plant dynamics. To accomplish this, a framework is proposed for the application of adaptive critics in real-time control (for those critic methods requiring a model of the plant). The framework is presented in the context of work being done in reconfigurable flight control by the NW Computational Intelligence Lab (NWCIL) at Portland State University. The proposal incorporates recent work (by others) in fast and efficient on-line plant identification, considerations for bounding the computational costs of converging neural networks, and a novel approach (by us) toward the task of assuring system stability during the adaptation process. The potential and limitations of the proposed framework are discussed. It is suggested that with the recent rapid reduction in computational barriers, only certain theoretical issues remain as the central barriers to successful on-line application of the methods.

关键词： programmable control Adaptive control Optimal control Neural networks Computational intelligence Control systems Stability State-space methods Design methodology Piecewise linear approximation

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Use of molecular beacons to study mixing and hybridization in microfluidic devices

Use of molecular beacons to study mixing and hybridization i...

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International Conference on Microtechnologies in Medicine and Biology

作者： Chuanwu Xi M. Balberg J. Selby S. Boppart L. Raskin Beckman Institute for Advanced Science and Technology University of Illinois Urbana-Champaign Urbana-Champaign IL USA Department of Electrical and Computer Engineering Bioengineering Program Beckman Institute for Advanced Science and Technology University of Illinois Urbana-Champaign Urbana-Champaign IL USA

We present the use of molecular beacons as sensitive indicators in microfluidic bioMEM devices. A method has been developed to study mixing and hybridization of molecular beacons to target nucleic acids in real time in a microfluidic channel. This method allows quantification of DNA and RNA molecules in solution, i.e., without the prerequisite of an immobilization step necessary in most other hybridization formats. The detection limit for DNA was determined to be in the order of femtomoles. Our results suggest the feasibility of using molecular beacon hybridization in microfluidic devices for the detection of pathogenic bacteria in environmental and medical fluids.

关键词： Microfluidics DNA RNA Microorganisms Kinetic theory Probes Sequences Ultrafast optics Fabrication USA Councils

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