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International Conference on Issues and Challenges in Intelligent Computing Techniques (ICICT)

作者： Biswapati Jana Shyamal Kumar Mondal Shannistha Jana Debasis Giri Vidyasagar University Midnapore West Bengal IN Dept. of Appl. Math. with Oceanol. & Comput. Program. Vidyasagar Univ. Paschim Medinipur India Dept. of Math. Midnapore Coll. Paschim Medinipur India Dept. of Comput. Sci. Eng. Haldia Inst. of Technol. Haldia India

This paper attempts to give a hardware based practical overview about cheating prevention of information hiding technique using Steganography and Visual Cryptographic Schemes (VCS). A combined technique have been proposed here, which allows visual information (e.g. printed text, handwritten notes, and images) to be distributed into 'n' secret shares as transparencies and embedding message into share became stego share for share authentication. Finally each of these stego shares embeds into a cover image using hardware module. At the time of recovering the receiver first decode each stego shares from the cover work than extract secret message from share to prevent cheating. The original secret message can be retrieve by overlapping the shares. The proposed encoding and decoding scheme for share generation is implemented in software module and embedding of message into share and stego share into cover image are implemented in hardware-based system for 2-D images.

关键词： Cryptography Discrete wavelet transforms Biological information theory Universal Serial Bus Computer architecture Airplanes PSNR

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Constructing Time Series Shape Association Measures: Minkowski Distance and Data Standardization

Constructing Time Series Shape Association Measures: Minkows...

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BRICS Congress on Computational Intelligence & Brazilian Congress on Computational Intelligence (BRICS-CCI & CBIC)

作者： Ildar Batyrshin Res. Program of Appl. Math. & Computations Mexican Pet. Inst. Mexico City Mexico

It is surprising that last two decades many works in time series data mining and clustering were concerned with measures of similarity of time series but not with measures of association that can be used for measuring possible direct and inverse relationships between time series. Inverse relationships can exist between dynamics of prices and sell volumes, between growth patterns of competitive companies, between well production data in oilfields, between wind velocity and air pollution concentration etc. The paper develops a theoretical basis for analysis and construction of time series shape association measures. Starting from the axioms of time series shape association measures it studies the methods of construction of measures satisfying these axioms. Several general methods of construction of such measures suitable for measuring time series shape similarity and shape association are proposed. Time series shape association measures based on Minkowski distance and data standardization methods are considered. The cosine similarity and the Pearson's correlation coefficient are obtained as partial cases of the proposed general methods that can be used also for construction of new association measures in data analysis.

关键词： Shape measurement Shape Time series analysis Time measurement Pollution measurement Atmospheric measurements Reflection

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Analytical/Numerical Solution for the Lagrangian Flamelet Model Equations

Analytical/Numerical Solution for the Lagrangian Flamelet Mo...

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Southern Conference on Computational Modeling (MCSUL)

作者： Francieli Aparecida Vaz Alvaro Luis de Bortoli PPGMAp - Graduate Program in Applied Mathematics UFRGS - Federal University of Rio Grande do Sul Bento Gonçalves 9500 Porto Alegre RS Brazil PPGMAp - Grad. Program in Appl. Math. UFRGS - Fed. Univ. of Rio Grande do Sul Porto Alegre Brazil

In the last years, the understanding of the combustion processes has been facilitated through the progress of asymptotic methods in appl.ed math.matics, of the computation and of experimental techniques. The aim of this work is to obtain and compare analytical/numerical results with experimental data for a confined jet diffusion flame. All thermochemical variables are determined by mixture fraction because the Sandia Flame D, used to check the results, is close to equilibrium. The developed method, based on the low Mach number formulation, allows to decrease the time needed to obtain reasonable results for confined jet diffusion flame. The analytical/numerical results compare well with the experimental data available in the literature.

关键词： Fuels math.matical model Equations Combustion Heating Chemical elements

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appl.ed math.matics Entering the 21st Century: Invited Talks from the ICIAM 2003 Congress: Preface

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appl.ed math.matics Entering the 21st Century: Invited Talks from theICIAM 2003 Congress

作者： Sloan, Ian H. International Program Committee Intl. Cncl. for Indust./Appl. Math.

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ISBN: (纸本)0898715598

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Environment, krill and squid in the Monterey Bay: From fisheries to life histories and back again

Environment, krill and squid in the Monterey Bay: From fishe...

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作者： Ish, Teresa Dick, E.J. Switzer, Paul V. Mangel, Marc Graduate Program in Marine Sciences University of California Santa Cruz CA United States Dept. of Ecol. and Evol. Biology University of California Santa Cruz CA United States Department of Biological Sciences Eastern Illinois University Charleston IL United States Dept. of Appl. Math. and Statistics The Jack Baskin Sch. of Engineering University of California 95064 Santa Cruz CA United States

The fishery for market squid in California is extremely valuable and only recently subject to regulations (in that sense, it is one of the last great open-access fisheries on the western coast of North America). We briefly review the history of the fishery for Loligo opalescens, on an annual time scale. Within-season analyses suggest that cohorts of squid persist offshore and move inshore for reproduction throughout the season. In order to predict the timing of inshore movement of squid, we develop a life history model using stochastic dynamic programming. This model allows us to link squid growth and reproduction with environmental factors, particularly, upwelling, temperature, and food abundance, in a consistent Darwinian framework. Using the model, we predict the timing of squid movement inshore in cold and warm environments, and the amount of biomass inshore in weekly intervals. We compare the model predictions with unpublished fishery-dependent data subsampled from landings and discuss the implications of our work for management of the squid fishery. © 2004 Elsevier Ltd. All rights reserved.

关键词： Oceanography

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Fishery management and culling (multiple letters)

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Science 2004年第5703期306卷 1891-1892页

作者： Corkeron, Peter J. Pikitch, Ellen K. Santora, Christine Babcock, Elizabeth Bakun, Andrew Bonfil, Ramon Conover, David Dayton, Paul Doukakis, Phaedra Fluharty, David Heneman, Burr Houde, Ed Livingston, Pat Mangel, Marc McAllister, Murdoch Pope, John Salnsbury, Keith Norwegian Inst. of Marine Research Pb 6404 N-9294 Tromsø Norway Pew Institute for Ocean Science Rosenstiel Sch. Mar. Atmosph. Sci. University of Miami 126 East 56th Street New York NY 10022 United States Pew Institute for Ocean Science RSMAS University of Miami 4600 Rickenbacker Causeway Miami FL 33149-1098 United States RSMAS University of Miami Miami FL 33149-1098 United States Wildlife Conservation Society 2300 Southern Boulevard Bronx NY 10460 United States Marine Sciences Research Center Stony Brook University Stony Brook NY 11794-5000 United States Scripps Institution of Oceanography San Diego CA 92093-0227 United States School of Marine Affairs University of Washington Seattle WA 98105 United States Commonweal Ocean Policy Program Bolinas CA 94924 United States University of Maryland Center for Environmental Science Chesapeake Biological Laboratory Solomons MD 20688 United States Alaska Fisheries Science Center Seattle WA 98115 United States Dept. of Appl. Math. and Statistics Jack Baskin School of Engineering University of California Santa Cruz CA 95064 United States Dept. of Environ. Sci. and Technol. Imperial College Royal School of Mines Building Prince Consort Road London SW7 2BP United Kingdom National Research Council Ltd. Norfolk NR34 OBT United Kingdom Division of Marine Research CSIRO Hobart Tasmania 7001 Australia

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Suppression of dispersion in NRZ communication systems using dispersion management

Suppression of dispersion in NRZ communication systems using...

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Conference on Lasers and Electro-Optics (CLEO)

作者： J.N. Kutz J.C. Bronski Princeton University Princeton NJ US Program in Appl. & Comput. Math. Princeton Univ. NJ USA

ISBN: (纸本)1557524432

Summary form only given. In recent years, much attention has been given to wavelength-division multiplexed (WDM) systems due to their ability to maximize lightwave communications. In practice, the combined effects of linear dispersion and nonlinear self phase modulation impose severe limitations on the long-haul performance of non-return-to-zero (NRZ) systems. The aim of this presentation is to provide an analytic description of the nonlinear pulse evolution in a NRZ communications system under a dispersion-management scheme.

关键词： Optical signal processing Dispersion Optical pulses math.matics Optical propagation Nonlinear equations Wavelength division multiplexing Phase modulation Scalability Solitons

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CLOSED-FORM MAGNETOSTATIC INTERACTION ENERGIES AND FORCES IN MAGNETIC FORCE MICROSCOPY

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JOURNAL OF PHYSICS A-math.MATICAL AND GENERAL 1995年第15期28卷 4201-4211页

作者： COFFEY, MW Program in Appl. Math. Colorado Univ. Boulder CO USA

The magnetostatic energies and forces derived from axisymmetric models appropriate for magnetic force microscopy (MFM) of superconductors are examined. For models with a semi-infinite sample, closed form representations are obtained for arbitrary probe height. Specific boundary value problems considered are appropriate for a vortex penetrating a type-II superconductor, or for a magnetic monopole or dipole above or within a superconductor. Physically important limits such as complete flux expulsion become transparent with the new results. It is shown that previously employed approximations and numerical quadrature are unnecessary.

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A NEW TWIST IN THE KINEMATICS AND ELASTIC DYNAMICS OF THIN-FILAMENTS AND RIBBONS

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JOURNAL OF PHYSICS A-math.MATICAL AND GENERAL 1994年第14期27卷 4919-4924页

作者： KLAPPER, I TABOR, M Program in Appl. Math. Arizona Univ. Tucson AZ USA

A formula governing the evolution of twist in moving filaments or ribbons of finite extent is derived. This evolution is shown to be made up of a 'dynamic' part corresponding to physical properties of the filament or ribbon and a 'geometric' part due to the motion of the filament or ribbon core itself. These results are used to extend classical elastic rod theory to the case of motion including dynamically evolving twist. In addition, the averaged geometric contribution is noted to be minus the time rate of change of the writhing number and it is shown that the writhe is a conserved quantity for closed filaments moving according to certain integrable curve dynamics.

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SHADOWING AND THE DIFFUSIONLESS LIMIT IN FAST DYNAMO THEORY

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NONLINEARITY 1993年第6期6卷 869-884页

作者： KLAPPER, I Program in Appl. Math. Arizona Univ. Tucson AZ USA

This paper addresses the question of how the zero and small diffusivity solutions to the kinematic magnetic induction equation are related. It is shown that, in the case of perturbed linear toral automorphisms, hyperbolicity properties allow a connection between the zero diffusivity Cauchy solution and the non-zero diffusivity Wiener ensemble solution using shadowing theory. A formula is derived that calculates over finite times the small diffusivity magnetic field in terms of the local zero diffusivity magnetic field by averaging against a Gaussian density with variance proportional to diffusivity. For linear toral automorphisms, it is proven that the infinite time fast dynamo growth rate can be calculated using a local Cauchy flux average in agreement with a conjecture by Finn and Ott.

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