ii36generalizedstochasticpetrinets.htm
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<title>II.3.6. Generalized Stochastic Petri Nets</title>
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<p class=heading-2>II.3.6. Generalized Stochastic Petri Nets</p>
<p class=heading-2-p> </p>
<p align="justify" class=normal><i>Generalized Stochastic</i> PNs (GSPNs) have
two different classes of transitions: <i>immediate</i> transitions and <i>timed</i>
transitions. Once enabled, immediate transitions fire in zero time. Timed transitions
fire after a random, exponentially distributed enabling time as in the case
of SPNs. For <i>timed</i> transitions, the firing rate (i.e. the inverse of
the mean time-duration) is, by default, marking independent, but the user can
select a marking-dependent operation (the same way as for SPNs).</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal> The simulation procedure is similar to the SPN
case, the only difference occurring in the case of the <i>immediate</i> transitions
that fire first; priorities/probabilities can be associated to these transitions,
in order to resolve the conflicts.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal>The <a href="ii37diary.htm"><b><i>Diary</i></b></b></a>
facility opens a new window that displays (dynamically) the instant(s) when
the next fireable transition(s) is (are) to fire.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal>The <a href="ii38scope.htm"><b><i>Scope</i></b></b></a>
facility opens a new figure window that displays (dynamically) the evolution
of the selected performance indices. The final value of the global index shown
by the Scope is identical to that displayed on request, at the end of simulation,
when the user explores the <b><i><a href="i26performancemenu.htm">Performance</a></i></b>
menu.</p><hr>
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