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Proceedings of the IEEE

Issue 10 • Date Oct 1993

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Displaying Results 1 - 9 of 9
  • A fractal analysis of interconnection complexity

    Publication Year: 1993, Page(s):1492 - 1499
    Cited by:  Papers (11)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    The emergent, collective properties of computer interconnections are shown to be characterized by a noninteger dimension Di , which is, in general, different from the system's Euclidean dimension. This dimension characterizes the properties of a fractal support, or substrate, on which interconnections are placed to provide communication throughout the system. The interconnectio... View full abstract»

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  • Overview of electrical processes in fractal geometry: from electrodynamic relaxation to superconductivity

    Publication Year: 1993, Page(s):1500 - 1510
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    The consequences of the parameterization of the fractal set on the electrodynamics of this set are analyzed. The relevance of scaling properties to electrochemical, dielectric, and magnetic relaxations is considered with a special emphasis on the use of noninteger derivative operators in electromagnetism and superconductivity. In electromagnetism, the above analysis includes a brief overview of th... View full abstract»

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  • Fractional Brownian motion models for synthetic aperture radar imagery scene segmentation

    Publication Year: 1993, Page(s):1511 - 1522
    Cited by:  Papers (39)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    The application of fractal random process models and their related scaling parameters as features in the analysis and segmentation of clutter in high-resolution, polarimetric synthetic aperture radar (SAR) imagery is demonstrated. Specifically, the fractal dimension of natural clutter sources, such as grass and trees, is computed and used as a texture feature for a Bayesian classifier. The SAR sha... View full abstract»

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  • Fractal image coding: a review

    Publication Year: 1993, Page(s):1451 - 1465
    Cited by:  Papers (171)  |  Patents (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1140 KB)

    An approach to image coding based on a fractal theory of iterated contractive transformations defined piecewise is described. The main characteristics of this approach are that it relies on the assumption that image redundancy can be efficiently captured and exploited through piecewise self-transformability on a block-wise basis, and it approximates an original image by a fractal image, obtained f... View full abstract»

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  • Signal compression based on models of human perception

    Publication Year: 1993, Page(s):1385 - 1422
    Cited by:  Papers (319)  |  Patents (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3468 KB)

    The notion of perceptual coding, which is based on the concept of distortion masking by the signal being compressed, is developed. Progress in this field as a result of advances in classical coding theory, modeling of human perception, and digital signal processing, is described. It is proposed that fundamental limits in the science can be expressed by the semiquantitative concepts of perceptual e... View full abstract»

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  • Fractals in the twist-and-flip circuit

    Publication Year: 1993, Page(s):1466 - 1491
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2124 KB)

    The twist-and-flip circuit contains only three circuit elements: two linear capacitors connected across the ports of a gyrator characterized by a nonlinear gyration conductance function g( v1, v2). When driven by a square-wave voltage source of amplitude a and frequency ω, the resulting circuit is described by a system of two nonauton... View full abstract»

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  • Wavelet-based representations for the 1/f family of fractal processes

    Publication Year: 1993, Page(s):1428 - 1450
    Cited by:  Papers (115)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1784 KB)

    It is demonstrated that 1/f fractal processes are, in a broad sense, optimally represented in terms of orthonormal wavelet bases. Specifically, via a useful frequency-domain characterization for 1/f processes, the wavelet expansion's role as a Karhunen-Loeve-type expansion for 1/f processes is developed. As an illustration of potential, it is shown that wavelet-based rep... View full abstract»

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  • Ultrasonic characterization of fractal models

    Publication Year: 1993, Page(s):1523 - 1533
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Ultrasonic scattering in inhomogeneous fluid media is examined. Of particular interest are those media having a compressibility that varies on a continuum of spatial scales. It is shown that the internal features of such media can be extracted by an analysis of the forward scattered field. The angular distribution of scattered pressure intensity is found to vary with frequency and compressibility ... View full abstract»

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  • Thelma Estrin, biomedical engineer: a pioneer of applied computing

    Publication Year: 1993, Page(s):1370 - 1382
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1252 KB)

    An account is given of the career of Thelma Estrin. Estrin entered engineering because of the urgent need for workers in the defense industries during World War II. After earning a Ph.D degree in electrical engineering in 1951, she worked in medical electronics (mainly electroencephalography) and on the design and construction of a digital computer (the WEIZAC). In 1960 she began a long associatio... View full abstract»

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