Performability modeling and evaluation techniques are applied to the SIFT computer as it might operate in the computational environment of an air transport mission. User-visible performance of the total system (SIFT plus its environment) is modeled as a random variable taking values in a set of levels of accomplishment. These levels are defined in terms of four attributes of total system behavior: safety, no change in mission profile, no operational penalties, and no economic process whose states describe the internal structure of SIFT as well as relavant conditions of the environment. Base model state trajectories are related to accomplishment levels via a capability function which is formulated in terms of a 3-level model hierarchy. Performability evaluation algorithms are then applied to determine the performability of the total system for various choices of computer and environment parameter values. Numerical results of those evaluations are presented and, in conclusion, some implications of this effort are discussed.

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Ann Arbor, MI  United States  48109
  • Authors:
    • Meyer, J F
    • Furchtgott, D G
    • Wu, L T
  • Publication Date: 1979-1

Media Info

  • Pagination: 40 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197931
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NASA-CR-158249
  • Contract Numbers: NSG-1306
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM