This paper proposes a hierarchical and modular methodology for modeling and evaluation of phased-mission systems in which phases have constant predetermined duration, and where missions may evolve dynamically selecting the next phase to be performed according to the system state. A 2-level modeling is proposed: the higher one models the mission itself; the lower one models the various phases. A separate 'modeling and resolution of phases' and 'dependencies among phases' are considered. This methodology is applied using an example of a space application. This method is compared with previous models. The advantages of this approach are in the great flexibility, easy applicability and reusability of the defined models. It permits: (1) obtaining information on the overall behavior of the system; and (2) focusing on each single phase to detect system dependability bottlenecks. The explicit modeling of the phase changes: (1) is a neat and easily understandable representation of the interphase dependencies; and (2) allows a straightforward modeling of the mission-profile dynamic selection. General purpose tools available to the reliability community can easily manage the computational complexity of the analysis.


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    Title :

    Hierarchical modeling and evaluation of phased-mission systems


    Contributors:
    Mura, I. (author) / Bondavalli, A. (author)

    Published in:

    Publication date :

    1999


    Size :

    9 Seiten, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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