Vincent Jugé

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We revisit Schneider’s work on policy enforcement by execution monitoring. We overcome limitations of Schneider’s setting by distinguishing between system actions that are controllable by an enforcement mechanism and those actions that are only observable, that is, the enforcement mechanism sees them but cannot prevent their execution. For this(More)
Dynamic complexity is concerned with updating the output of a problem when the input is slightly changed. We study the dynamic complexity of two-player parity games over graphs of bounded tree-width, where updates may add or delete edges, or change the owner or color of states. We show that this problem is in DynFO (with LOGSPACE precomputation); this is(More)
Dynamic complexity is concerned with updating the output of a problem when the input is slightly changed. We study the dynamic complexity of Dyck reachability problems in directed and undirected graphs, where updates may add or delete edges. We show a strong dichotomy between such problems, based on the size of the Dyck alphabet. Some of them are P-complete(More)
We revisit Schneider’s work on policy enforcement by execution monitoring. We overcome limitations of Schneider’s setting by distinguishing between system actions that are controllable by an enforcement mechanism and those actions that are only observable, that is, the enforcement mechanism sees them but cannot prevent their execution. For this refined(More)
We aim at studying the asymptotic properties of typical positive braids, respectively positive dual braids. Denoting by μk the uniform distribution on positive (dual) braids of length k, we prove that the sequence (μk)k converges to a unique probability measure μ∞ on infinite positive (dual) braids. The key point is that the limiting measure μ∞ has a(More)
Computing steady-state distributions in infinite-state stochastic systems is in general a very difficult task. Product-form Petri nets are those Petri nets for which the steady-state distribution can be described as a natural product corresponding, up to a normalising constant, to an exponentiation of the markings. However, even though some classes of nets(More)
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