Dependability Modeling & Evaluation of Multiple-Phased Systems using DEEM

نویسندگان

  • Andrea Bondavalli
  • Silvano Chiaradonna
  • Felicita Di Giandomenico
  • Ivan Mura
چکیده

life can be partitioned in a set of disjoint periods, called " phases " , include several classes of systems such as Phased Mission Systems and Scheduled Maintenance Systems. Because of their deployment in critical applications, the dependability modeling and analysis of Multiple-Phased Systems is a task of primary relevance. The phased behavior makes the analysis of Multiple-Phased Systems extremely complex. This paper describes the modeling methodology and the solution procedure implemented in DEEM, a dependability modeling and evaluation tool specifically tailored for Multiple Phased Systems. It also describes its use for the solution of representative MPS problems. DEEM relies upon Deterministic and Stochastic Petri Nets as the modeling formalism, and on Markov Regenerative Processes for the model solution. When compared to existing general-purpose tools based on similar formalisms, DEEM offers advantages on both the modeling side (sub-models neatly model the phase-dependent behaviors of MPS), and on the evaluation side (a specialized algorithm allows a considerable reduction of the solution cost and time). Thus, DEEM is able to deal with all the scenarios of MPS which have been analytically treated in the literature, at a cost which is comparable with that of the cheapest ones, completely solving the issues posed by the phased-behavior of MPS. ACRONYMS 1 MPS multiple-phased system PMS phased mission system SMS scheduled maintenance system DEEM dependability evaluation of multiple-phased systems DSPN deterministic and stochastic Petri net MRGP Markov regenerative process CTMC continuous-time Markov chain GUI graphical user interface * c 20xx IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. 1 The singular and plural of an acronym are always spelled the same. 1 SN system net PhN phase net RGP reachability graph of the PhN SRGG sequential reachability graph generation NOTATION V (t) transient probability matrix of the MRGP process …

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تاریخ انتشار 2004