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  • COMPUTER OPERATIONS AND HARDWARE  (3)
  • 1980-1984  (3)
  • 1960-1964
  • 1983
  • 1982  (3)
  • 1
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    In:  CASI
    Publication Date: 2019-06-28
    Description: It is noted that if computing system performance is degradable then system evaluation must deal simultaneously with aspects of both performance and reliability. One approach is the evaluation of a system's performability which, relative to a specified performance variable Y, generally requires solution of the probability distribution function of Y. The feasibility of closed-form solutions of performability when Y is continuous are examined. In particular, the modeling of a degradable buffer/multiprocessor system is considered whose performance Y is the (normalized) average throughput rate realized during a bounded interval of time. Employing an approximate decomposition of the model, it is shown that a closed-form solution can indeed be obtained.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA-CR-168835 , NAS 1.26:168835
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-28
    Description: Literature on the specification, design, verification, testing, and evaluation of avionics systems was surveyed, providing 655 citations. Journal papers, conference papers, and technical reports are included. Manual and computer-based methods were employed. Keywords used in the online search are listed.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA-CR-168849 , NAS 1.26:168849 , REPT-014524-19-T , UMICH-SEL-163
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: Models, measures, and techniques for evaluating the effectiveness of aircraft computing systems were developed. By "effectiveness" in this context we mean the extent to which the user, i.e., a commercial air carrier, may expect to benefit from the computational tasks accomplished by a computing system in the environment of an advanced commercial aircraft. Thus, the concept of effectiveness involves aspects of system performance, reliability, and worth (value, benefit) which are appropriately integrated in the process of evaluating system effectiveness. Specifically, the primary objectives are: the development of system models that provide a basis for the formulation and evaluation of aircraft computer system effectiveness, the formulation of quantitative measures of system effectiveness, and the development of analytic and simulation techniques for evaluating the effectiveness of a proposed or existing aircraft computer.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA-CR-170229 , NAS 1.26:170229 , REPT-014524-21-T , SEL-170
    Format: application/pdf
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