1 research outputs found
Verification problems for timed and probabilistic extensions of Petri Nets
In the first part of the thesis, we prove the decidability (and PSPACE-completeness) of
the universal safety property on a timed extension of Petri Nets, called Timed Petri Nets.
Every token has a real-valued clock (a.k.a. age), and transition firing is constrained by
the clock values that have integer bounds (using strict and non-strict inequalities). The
newly created tokens can either inherit the age from an input token of the transition or
it can be reset to zero.
In the second part of the thesis, we refer to systems with controlled behaviour that
are probabilistic extensions of VASS and One-Counter Automata. Firstly, we consider
infinite state Markov Decision Processes (MDPs) that are induced by probabilistic
extensions of VASS, called VASS-MDPs. We show that most of the qualitative problems
for general VASS-MDPs are undecidable, and consider a monotone subclass in which
only the controller can change the counter values, called 1-VASS-MDPs. In particular,
we show that limit-sure control state reachability for 1-VASS-MDPs is decidable, i.e.,
checking whether one can reach a set of control states with probability arbitrarily close
to 1. Unlike for finite state MDPs, the control state reachability property may hold limit
surely (i.e. using an infinite family of strategies, each of which achieving the objective
with probability ≥ 1-e, for every e > 0), but not almost surely (i.e. with probability 1).
Secondly, we consider infinite state MDPs that are induced by probabilistic extensions of
One-Counter Automata, called One-Counter Markov Decision Processes (OC-MDPs).
We show that the almost-sure {1;2;3}-Parity problem for OC-MDPs is at least as hard
as the limit-sure selective termination problem for OC-MDPs, in which one would
like to reach a particular set of control states and counter value zero with probability
arbitrarily close to 1