Optical arithmetic-logic processors based on location, content addressable and associative memories.
Item
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Title
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Optical arithmetic-logic processors based on location, content addressable and associative memories.
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Identifier
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AAI9108132
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identifier
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9108132
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Creator
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Kostrzewski, Andrew Adam.
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Contributor
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Advisers: George Eichmann | Herbert G. Kayser | Yao Li
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical | Computer Science
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Abstract
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Applications of content addressable, location addressable and associative memory for optical signal processing are studied in this thesis. The first two types of memory may use either coherent or noncoherent processing, but the last type uses only coherent processing.;A new real-time optical position coded processor is presented and experimentally implemented. The crossbar switch is implemented by using a single laser source with two cascaded commercial liquid-crystal TVs, with operands represented as mutually orthogonal slits. The intersection of the slits represents an operation result and the collection of light output points constitutes a look-up table for a specific arithmetic-logic operation. A holographic mapping maps each truth-table point to a proper position coded result. Experimental results for a residue number multiplier are presented. An optical implementation of multiple-valued logic is also presented. Realizations of optical modified signed-digit as well as Post logic gates are included. Some experimental demonstrations are presented.;A new scheme for digital optical computing utilizing a non-holographic opto-electronic content addressable memory is discussed. Designs of optical binary carry look-ahead adder and modified signed digit adder are presented. Also implementations of binary number, a sign/logarithm number and residue number multiplier are included to illustrate the application of this arithmetic processor. This opto-electronic content addressable memory offers a number of practical advantages, such as fast processing speed and ease of optical implementation and alignment compared to other approaches. Active low and high spatial content addressable memory mask encoding techniques are discussed. Multioperation and multibit content addressable memory processors are described.;Optical register transfer micro-operations based on associative memory are proposed. A hybrid optical word-parallel, bit serial register transfer processor architecture based on an optical holographic associative symbolic substitution is described and preliminary experimental results are presented.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
