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检索条件"主题词=Algorithm Development"

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Design of materials with extreme thermal expansion using a three-phase topology optimization method

引用

Conference on Smart Materials Technologies

作者： Sigmund, O Torquato, S Princeton Univ. (Denmark) Princeton Univ. (United States)

ISBN: (纸本)0819424536

We show how composites with extremal or unusual thermal expansion coefficients can be designed using a numerical topology optimization method. The composites are composed of two different material phases and void. The optimization method is illustrated by designing materials having maximum thermal expansion, zero thermal expansion, and negative thermal expansion. Assuming linear elasticity, it is shown that materials with effective negative thermal expansion coefficients can be obtained by mixing two phases with positive thermal expansion coefficients and void. We also show that there is no mechanistic relationship between negative thermal expansion and negative Poisson's ratio.

关键词： Composites Thermal effects Nickel Solids Actuators algorithm development Anisotropy Crystals Manufacturing Temperature metrology

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Method of easily extracting resist development parameters for lithography simulation

Method of easily extracting resist development parameters fo...

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Conference on Optical Microlithography IX

作者： Lucas, KD Ivin, VV Kudrja, VP Larin, DY Makhviladze, TM Medvedeva, MG Rogov, AA Verzunov, SV Yang, DC MOTOROLA INC ADV PROD RES & DEV LABAUSTINTX 78721

ISBN: (纸本)0819421022

We present a description of a software tool and a methodology for easily creating photoresist development rate parameters in lithography simulation. The tool optimizes parameters using the Modified Simplex Method. The methodology uses the tool to provide insight into the effects of the development rate parameters and to find usable parameters quickly. The reasonings behind the methodology are discussed as well as advantages and disadvantages. Results from three different lithography simulators are shown to agree well with experimental cross-section SEM data.

关键词： Lithography Diffusion Photoresist developing Photoresist materials 3D modeling algorithm development Picture Archiving and Communication System Radon Scanning electron microscopy Software development

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Two new methods for simulating photolithography development in 3D

Two new methods for simulating photolithography development ...

引用

Conference on Optical Microlithography IX

作者： Helmsen, J Puckett, EG Colella, P Dorr, M LAWRENCE LIVERMORE NATL LAB CTR COMPUTAT SCI & ENGNLIVERMORECA 94550

ISBN: (纸本)0819421022

Two methods are presented for simulating the development of photolithographic profiles during the resist dissolution phase. These algorithms are the volume-of-fluid algorithm, and the steady level-set algorithm. These methods are compared with the ray-trace, cell and level- set techniques employed in SAMPLE-3D. The volume-of-fluid algorithm employs an Euclidean Grid with volume fractions. At each time step, the surface is reconstructed by computing an approximation of the tangent plane of the surface in each cell that contains a value between 0 and 1. The geometry constructed in this manner is used to determine flow velocity vectors and the flux across each edge. The material is then advanced by a split advection scheme. The steady level set algorithm is an extension of the iterative level set algorithm. The steady level set algorithm combines fast level set concepts and a technique for finding zero residual solutions to the eikonal function. The etch time for each cell is calculated in a time ordered manner. Use of heap sorting data structures allows the algorithm to execute extremely quickly. A similar technique was submitted by J. Sethian. Comparisons of the methods have been performed and the results are shown.

关键词： Etching Optical lithography Interfaces Photoresist materials algorithms Computer simulations Mathematics algorithm development Mechanics Photoresist developing

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REMOTE SENSING OF NATURAL WATER QUALITY PARAMETERS - RETRIEVAL algorithm development AND OPTIMISATION ANALYSIS 12

REMOTE SENSING OF NATURAL WATER QUALITY PARAMETERS - RETRIEV...

引用

Ocean Optics XII Conference

作者： KONDRATYEV, KY POZDNYAKOV, DV PETTERSSON, LH SCI RES CTR ECOL SAFETY ST PETERSBURG 197042RUSSIA

ISBN: (纸本)081941574X

development of water quality retrieval algorithms is discussed in terms of causal dependence of the upwelling spectral radiance upon the water composition. Unlike clean marine/oceanic waters for which linear regression retrieval relationships are valid, inland and coastal zone water masses with high degree of optical complexity necessitate the development of nonparametric retrieval approaches. At the basis of these techniques are models considering the optical competitiveness of several coexisting aquatic components. Such models for Lakes Ladoga and Ontario are described and compared. Monte Carlo simulations have been performed to analyze the spectral and angular variations of the upwelling radiance scattered by the water column out into the atmosphere. Analysis of optical conditions for running remote sounding natural waters of various optical complexity is carried out. Relevant recommendations are formulated.

关键词： Water Ocean optics Remote sensing Absorption Atmospheric modeling Active optics algorithm development Reflectivity Sun Coastal modeling

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Randomized method for planar motion detection

Randomized method for planar motion detection

引用

Conference on Vision Geometry V

作者： Fermin, I Imiya, A Ichikawa, A CHIBA UNIV DEPT COMP INFORMAT & COGNIT SCIINAGE KUCHIBA 263JAPAN

ISBN: (纸本)0819422142

In this paper, we propose a randomized algorithm to estimate the planar motion parameters of a finite closed set. By randomly searching points on two shapes measured at different times, we determine the centroids and translation of the planar shapes. Taking these centroids as reference points, the algorithm proceeds to determine the point-to- point correspondences by randomly searching three points on each shape that form congruent triangles. After the point correspondences have been determined, the rotation is estimated by solving the rigid motion equation.

关键词： Motion estimation Motion detection Optical flow Detection and tracking algorithms Hough transforms Time metrology algorithm development Computer vision technology Machine vision Iris recognition

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Optimization of stepper parameters and their influence on OPC

Optimization of stepper parameters and their influence on OP...

引用

Conference on Optical Microlithography IX

作者： Vallishayee, RR Orszag, SA Barouch, E PRINCETON UNIV FLUID DYNAM RES CTRPRINCETONNJ 08544

ISBN: (纸本)0819421022

An algorithm for the optimization of stepper parameters has been designed and implemented. The cost function used in this optimization is the contrast. The aerial image is computed using the computer code FAIM. First, the contrast of the image is calculated and the derivatives of the contrast with respect to the stepper parameters are evaluated. The computational cost of these calculations is only slightly more than that of one aerial image simulation. A conjugate gradient type algorithm is then used to obtain the minimum of the contrast.

关键词： Fiber optic illuminators Optical proximity correction Computer aided design Photomasks Semiconducting wafers Image compression Optimization (mathematics) algorithm development Computer programming Manufacturing

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Calibration methods and results for the advanced solid-state array spectroradiometer (ASAS)

Calibration methods and results for the advanced solid-state...

引用

Conference on Multispectral Imaging for Terrestrial Applications

作者： Dabney, PW Tierney, MR Irons, JR Kovalick, WM Bur, MC Russell, CA NASA Goddard Space Flight Ctr. (United States) Hughes STX (United States) Univ. of Maryland/College Park (United States)

ISBN: (纸本)0819422061

Improved methods for calibrating and characterizing the CCD array based off-nadir tiltable Advanced Solid-State Array Spectroradiometer (ASAS) were developed and applied. Sensor characteristics such as radiometric sensitivity, polarization sensitivity, signal-to-noise-ratio, temperature sensitivity, spectral bandpass, spectral distortion, and spatial resolution were measured. Radiometric sensitivity, array temperature sensitivity, and signal-to-noise were measured using a Barium Sulfate coated integrating hemisphere whose output calibration is traceable to NIST. Polarization sensitivity was measured for 62 spectral bands across all 512 spatial pixels (31 K pixels). Spectral bandpass and spectral distortion were measured using a 0.5 meter doublepass monochromator. Spatial resolution (given as the modulation-transfer-function - MTF) and distortion were measured using a combination of monochromatic collimated light to directly measure the point-spread-function (PSF) and the edge spread function (ESF) derived from actual image data. The MTF obtain using the two techniques are compared. Potential improvements to the test setups and methods are described.

关键词： Calibration Polarization Signal to noise ratio Sensors Point spread functions Modulation transfer functions Lithium Spectral calibration Monochromators algorithm development

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Fluorescent photon migration theory for turbid biological media

Fluorescent photon migration theory for turbid biological me...

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3rd Conference on Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases - Optical Biopsy

作者： Gandjbakhche, AH Bonner, RF Gannot, I Knutson, J Navai, R Nossal, R Weiss, GH National Institutes of Health (Israel) National Institutes of Health (United States) Ctr. for Devices and Radiological Health/FDA (Israel)

ISBN: (纸本)0819420530

Fluorescence imaging in situ may provide highly specific identification of cell types and altered metabolic activity near the surface of tissue. Most approaches to developing the necessary analytical framework for quantitative 3-D use are based on numerical solutions of some form of transport equation. These are highly computer-intensive and can only be carried out for specified parameters. We apply a random walk model for photon migration which enables us to find an exact expression for the frequency-dependent fluorescent signal emitted from the site of a single fluorophore. Our general expression allows for broad variation of the degree of absorptivity, and is potentially important in providing a basis for the development of fluorescence image reconstruction algorithms.

关键词： Modulation Tissue optics Phase shift keying Absorption Light scattering Luminescence Natural surfaces Scattering algorithm development Tissues

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Line extraction from Synthetic Aperture Radar scenes using a Markov random field model

Line extraction from Synthetic Aperture Radar scenes using a...

引用

Conference on Microwave Sensing and Synthetic Aperture Radar

作者： Hellwich, O Technical Univ. Munich (Germany)

ISBN: (纸本)0819423629

Due to the speckle effect of coherent imaging the detection of lines in Synthetic Aperture Radar (SAR) scenes is considerably more difficult than in optical images. A new approach to detect lines in noisy images using a Markov random field (MRF) model and Bayesian classification is proposed. The unobservable object classes of single pixels are assumed to fulfill the Markov condition, i.e. to depend on the object classes of neighboring pixels only. The influence of neighboring line pixels is formulated based on potentials derived from a random walk model. Locally, the image data is evaluated with a rotating template. As SAR intensity data is deteriorated by multiplicative noise, normalized intensity ratio is used as the response of the local line detector resulting in a constant false alarm rare. The new approach integrates SAR intensity and coherence from interferometric processing of a SAR scene pair. Besides maximum a posteriori (MAP) and iterated conditional modes (ICM) estimation of the object parameters, an implementation of local highest confidence first (LHCF) estimation is used. It is initially applied to the sites which are most probably structures in object space, and is then allowed to progress to regions less promising for line detection depending on the results of previous iterations. In this way processing times are substantially reduced.

关键词： Synthetic aperture radar Magnetorheological finishing Particles Sensors algorithms algorithm development Coherence imaging Image classification Roads Speckle

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Acoustooptic processors of combined signal processing

Acoustooptic processors of combined signal processing

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2nd International Conference on Optical Information Processing

作者： Grigoryev, VA Kuzichkin, AV Kuzichkin, SA Khvorov, I Gribin, VP Military Engineering Space Academy and Military Radio Engineering College (Russia)

In this paper iue present the information about classification and realization of the combined signal processing algorithms. The short analysis of algoritms performances are implemented.

ISBN: (纸本)0819423750

In this paper iue present the information about classification and realization of the combined signal processing algorithms. The short analysis of algoritms performances are implemented.

关键词： Signal processing Acousto-optics Modulators Optical correlators Convolution Spatial filters Polarization Telecommunications Aerospace engineering algorithm development

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