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检索条件"机构=Center for Image Processing and Integrated Computing "

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Visualizing DIII-D Tokamak magnetic field lines

Visualizing DIII-D Tokamak magnetic field lines

引用

IEEE Conference on Visualization

作者： G. Schussman Kwan-Liu Ma D. Schissel T. Evans Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA General Atomics Court San Diego CA USA

We demonstrate the use of a combination of perceptually effective techniques for visualizing magnetic field data from the DIII-D Tokamak. These techniques can be implemented to run very efficiently on machines with hardware support for OpenGL. Interactive speeds facilitate clear communication of magnetic field structure, enhancing fusion scientists' understanding of their data, and thereby accelerating their research.

关键词： Tokamaks Magnetic fields Plasma confinement Data visualization Plasma sources Magnetic confinement Physics Data analysis Toroidal magnetic fields Hardware

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Constructing material interfaces from data sets with volume-fraction information 00

Constructing material interfaces from data sets with volume-...

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Proceedings of the conference on Visualization '00

作者： Kathleen S. Bonnell Kenneth I. Joy Bernd Hamann Daniel R. Schikore Mark Duchaineau Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA Computational Engineering International Morisville NC Center for Advanced Scientific Computing (CASC) Lawrence Livermore National Laboratory Livermore CA

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Visualizing DIII-D Tokamak magnetic field lines 00

Visualizing DIII-D Tokamak magnetic field lines

引用

Proceedings of the conference on Visualization '00

作者： Greg Schussman Kwan-Liu Ma David Schissel Todd Evans Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA General Atomics 3550 General Atomics Court San Diego CA

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Bicubic subdivision-surface wavelets for large-scale isosurface representation and visualization 00

Bicubic subdivision-surface wavelets for large-scale isosurf...

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Proceedings of the conference on Visualization '00

作者： Martin Bertram Mark A. Duchaineau Bernd Hamann Kenneth I. Joy Center for Applied Scientific Computing (CASC) Lawrence Livermore National Laboratory P.O. Box 808 L-561 Livermore CA and Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California at Davis Davis CA Center for Applied Scientific Computing (CASC) Lawrence Livermore National Laboratory P.O. Box 808 L-561 Livermore CA Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California at Davis Davis CA

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Signal monitoring on the downlink of cellular CDMA communications with interference cancellation 1

Signal monitoring on the downlink of cellular CDMA communica...

引用

1st IEEE Annual Wireless Communications and Networking Conference, WCNC 1999

作者： Golanbari, Michael Ford, Gary E. Center for Image Processing and Integrated Computing Dept. of Electrical and Computer Engineering University of California DavisCA95616 United States

ISBN: (纸本)0780356683

We develop and evaluate receiver algorithms for the detection of signals transmitted via the downlink of a cellular system modeled after the IS-95 standard for code-division multiple-access (CDMA) communications. Multiuser detectors on board airborne and terrestrial mobile signal monitors attempt the simultaneous detection, in a single receiver, of all communication signals transmitted by the base station of interest. Due to the detrimental effects of transmitter, receiver and channel nonlinearities, very fast multipath fading, Doppler spread, additive white Gaussian noise, and intercell multiple-access interference, the user signals are de-orthogonalized. This leads to performance degradation in conventional receivers that is too severe, especially when the powers of some of the interfering users are dominant. In order to improve upon the performance of conventional matched filter receivers, this article focuses on the development and evaluation of relatively simple successive interference canceling (SIC) algorithms. The techniques we have developed can be used to enable successful interception of CDMA signals;to relax the strict requirements on power control;and to improve the capacity of CDMA systems. © 1999 IEEE.

关键词： Code division multiple access

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Improved directional algorithm of the non-linear anisotropic diffusion equation for images

Improved directional algorithm of the non-linear anisotropic...

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IEEE International Conference on image processing

作者： E.Q. Wong V.R. Algazi Center For Image Processing and Integrated Computing University of California Davis CA USA

We present an algorithm to greatly reduce the directionality bias inherent in existing finite difference implementations of the non-linear anisotropic diffusion equation when applied to images. We demonstrate the meri... 详细信息

关键词： Anisotropic magnetoresistance Nonlinear equations Finite difference methods Noise reduction image processing Difference equations Signal to noise ratio Postal services Partial differential equations Digital images

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Optimal linear spline approximation of digitized models

Optimal linear spline approximation of digitized models

引用

IEEE International Conference on Information Visualization, IV 1999

作者： Hamann, Bemd Kreylos, Oliver Monno, Giuseppe Uva, Antonio E. Center for Image Processing and Integrated Computing Department of Computer Science University of California DavisCA United States Dipartimento di Progettazione e Produzione Industriale Politecnico di Bari Bari Italy

ISBN: (纸本)0769502105

In this paper we present a new technique for surface reconstruction of digitized models in three dimensions. Concerning this problem, we are given a data set in threedimensional space, represented as a set of points without connectivity information, and the goal is to find, for a Jxed number of vertices, a set of approximating triangles which minimize the error measured by the displacement from the given points. Our method creates near-optimal linear spline approximations, using an iterative optimization scheme based on simulated annealing. The algorithm adapts the mesh to the data set and moves the triangles to enhance feature lines. .4 t the end, we can use the approach to create a hierarchy of dtfferent resolutions for the model. © 1999 IEEE.

关键词： Simulated annealing

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image enhancement using linear diffusion and an improved gradient map estimate

Image enhancement using linear diffusion and an improved gra...

引用

IEEE International Conference on image processing

作者： E.Q. Wong V.R. Algazi CIPIC Center of Image Processing and Integrated Computing University of California Davis CA USA

In this paper, we propose an approach to improve the noise removal/structure preservation properties of non-linear, inhomogenous diffusion filtering algorithms. These algorithms are locally driven by the gradient vector. We introduce an algorithm to obtain an estimate of the gradient vector field using local and global information contained in the original noisy gradient field. The estimated gradient field is then applied to a linear inhomogeneous diffusion process. Good structure preservation/image denoising properties are obtained using this new approach.

关键词： image enhancement Diffusion processes Yield estimation image processing Vectors Tensile stress image denoising Nonlinear equations Postal services Filtering

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Boundary determination for trivariate solids

Boundary determination for trivariate solids

引用

Pacific Conference on Computer Graphics and Applications

作者： K.I. Joy M.A. Duchaineau Center for Image Processing and Integrated Computing (CIPIC) Computer Science Department University of California Davis USA Center for Applied Scientific Computing Lawrence Livemore National Laboratory USA

The trivariate tensor-product B-spline solid is a direct extension of the B-spline patch and has been shown to be useful in the creation and visualization of free-form geometric solids. Visualizing these solid objects requires the determination of the boundary surface of the solid, which is a combination of parametric and implicit surfaces. This paper presents a method that determines the implicit boundary surface by examination of the Jacobian determinant of the defining B-spline function. Using an approximation to this determinant, the domain space is adaptively subdivided until a mesh can be determined such that the boundary surface is close to linear in the cells of the mesh. A variation of the marching cubes algorithm is then used to draw the surface. Interval approximation techniques are used to approximate the Jacobian determinant and to approximate the Jacobian determinant gradient for use in the adaptive subdivision methods. This technique can be used to create free-form solid objects, useful in geometric modeling applications.

关键词： Spline Jacobian matrices Solid modeling Visualization Rendering (computer graphics) Surface cracks image processing Computer science Scientific computing Laboratories

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Towards interactive finite element analysis of shell structures in virtual reality

Towards interactive finite element analysis of shell structu...

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International Conference on Information Visualisation (IV)

作者： A. Liverani F. Kuester B. Hamann DIEM University of Bologna Italy Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA

A first step towards a semi-immersive virtual reality (VR) interface for finite element analysis (FEA) is presented in this paper. During recent years, user interfaces of FEA solvers have matured from character-based command-line driven implementations into easy-to-use graphical user interfaces (GUIs). This new generation of GUIs provides access to intuitive and productive tools for the management and analysis of structural problems. Many pre- and post-processors have been implemented targeting the simplification of the man-machine interface in order to increase the ease of use and provide better visual analysis of FEA solver results. Nevertheless, none of these packages provides a real 3D-enabled interface. The main objective of this project is to join state-of-the-art visualization technology, VR devices, and FEA solvers into the integrated development environment VRFEA.

关键词： Finite element methods Structural shells Virtual reality Analytical models Data visualization Design engineering Hardware image analysis Computer interfaces Humans

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