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  • 1
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    A discrete Fourier transform for virtual memory machines (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An algebraic theory of the Discrete Fourier Transform is developed in great detail. Examination of the details of the theory leads to a computationally efficient fast Fourier transform for the use on computers with virtual memory. Such an algorithm is of great use on modern desktop machines. A FORTRAN coded version of the algorithm is given for the case when the sequence of numbers to be transformed is a power of two.
    Keywords: THEORETICAL MATHEMATICS
    Type: NASA-TM-103914 , A-92048 , NAS 1.15:103914
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of a benchmark suite to evaluate mixed numeric and symbolic processing (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The suite of programs that formed the benchmark for a proposed advanced computer is described and analyzed. The features of the processor and its operating system that are tested by the benchmark are discussed. The computer codes and the supporting data for the analysis are given as appendices.
    Keywords: COMPUTER SYSTEMS
    Type: NASA-TM-103907 , A-92023 , NAS 1.15:103907
    Format: application/pdf
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  • 3
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    Queuing theory models for computer networks (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A set of simple queuing theory models which can model the average response of a network of computers to a given traffic load has been implemented using a spreadsheet. The impact of variations in traffic patterns and intensities, channel capacities, and message protocols can be assessed using them because of the lack of fine detail in the network traffic rates, traffic patterns, and the hardware used to implement the networks. A sample use of the models applied to a realistic problem is included in appendix A. Appendix B provides a glossary of terms used in this paper. This Ames Research Center computer communication network is an evolving network of local area networks (LANs) connected via gateways and high-speed backbone communication channels. Intelligent planning of expansion and improvement requires understanding the behavior of the individual LANs as well as the collection of networks as a whole.
    Keywords: SYSTEMS ANALYSIS
    Type: NASA-TM-101056 , A-89013 , NAS 1.15:101056
    Format: application/pdf
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  • 4
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    Basic mathematical function libraries for scientific computation (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Ada packages implementing selected mathematical functions for the support of scientific and engineering applications were written. The packages provide the Ada programmer with the mathematical function support found in the languages Pascal and FORTRAN as well as an extended precision arithmetic and a complete complex arithmetic. The algorithms used are fully described and analyzed. Implementation assumes that the Ada type FLOAT objects fully conform to the IEEE 754-1985 standard for single binary floating-point arithmetic, and that INTEGER objects are 32-bit entities. Codes for the Ada packages are included as appendixes.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-102256 , A-90015 , NAS 1.15:102256
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  • 5
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    Accurate Evaluation of Quantum Integrals (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-10
    Description: Combining an appropriate finite difference method with Richardson's extrapolation results in a simple, highly accurate numerical method for solving a Schr\"{o}dinger's equation. Important results are that error estimates are provided, and that one can extrapolate expectation values rather than the wavefunctions to obtain highly accurate expectation values. We discuss the eigenvalues, the error growth in repeated Richardson's extrapolation, and show that the expectation values calculated on a crude mesh can be extrapolated to obtain expectation values of high accuracy.
    Keywords: Computer Programming and Software
    Format: text
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  • 6
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    Optical computing at NASA Ames Research Center (1991)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Optical computing research at NASA Ames Research Center seeks to utilize the capability of analog optical processing, involving free-space propagation between components, to produce natural implementations of algorithms requiring large degrees of parallel computation. Potential applications being investigated include robotic vision, planetary lander guidance, aircraft engine exhaust analysis, analysis of remote sensing satellite multispectral images, control of space structures, and autonomous aircraft inspection.
    Keywords: COMPUTER SYSTEMS
    Type: AIAA PAPER 91-3779 , AIAA Computing in Aerospace Conference; Oct 21, 1991 - Oct 24, 1991; Baltimore, MD; United States
    Format: text
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  • 7
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    Spreadsheet Analysis Of Queuing In A Computer Network (1992)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Method of analyzing responses of computer network based on simple queuing-theory mathmatical models via spreadsheet program. Effects of variations in traffic, capacities of channels, and message protocols assessed.
    Keywords: ELECTRONIC SYSTEMS
    Type: ARC-12726 , NASA Tech Briefs (ISSN 0145-319X); 16; 5; P. 42
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  • 8
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    Benchmark Lisp And Ada Programs (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Suite of nonparallel benchmark programs, ELAPSE, designed for three tests: comparing efficiency of computer processing via Lisp vs. Ada; comparing efficiencies of several computers processing via Lisp; or comparing several computers processing via Ada. Tests efficiency which computer executes routines in each language. Available for computer equipped with validated Ada compiler and/or Common Lisp system.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: ARC-12980 , NASA Tech Briefs (ISSN 0145-319X); 16; 8; P. 52
    Format: text
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