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A dependability state diagram is a method for modelling a system as a Markov chain. It is used in reliability engineering for availability and reliability analysis. It consists of creating a finite state machine which represent the different states a system may be in. Transitions between states happen as a result of events from underlying Poisson processes with different intensities. == Example == A redundant computer system consist of identical two-compute nodes, which each fail with an intensity of . When failed, they are repaired one at the time by a single repairman with negative exponential distributed repair times with expectation . * state 0: 0 failed units, normal state of the system. * state 1: 1 failed unit, system operational. * state 2: 2 failed units. system not operational. Intensities from state 0 and state 1 are , since each compute node has a failure intensity of . Intensity from state 1 to state 2 is . Transitions from state 2 to state 1 and state 1 to state 0 represent the repairs of the compute nodes and have the intensity , since only a single unit is repaired at the time. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Dependability state model」の詳細全文を読む スポンサード リンク
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