Thomas Hujsa

Thomas Hujsa
Laboratoire d’Analyse et d’Architecture des Systèmes (LAAS) | LAAS · Department of Crucial Computing (IC)

PhD
Researcher

About

26
Publications
1,702
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155
Citations
Additional affiliations
October 2011 - October 2014
Sorbonne Université
Position
  • PhD Student

Publications

Publications (26)
Conference Paper
Full-text available
A Petri net is reversible if its initial marking is a home marking, a marking reachable from any reachable marking. This property is fundamental in man-made systems as it lets a system return to its initial state using only internal operations. Necessary and sufficient conditions are already known for the reversibility of well-formed Choice-Free an...
Article
Liveness, (non-)deadlockability and reversibility are behavioral properties of Petri nets that are fundamental for many real-world systems. Such properties are often required to be monotonic, meaning preserved upon any increase of the marking. However, their checking is intractable in general and their monotonicity is not always satisfied. To simpl...
Preprint
Full-text available
Although decidable, the marking reachability problem for Petri nets is well-known to be intractable in general, and a non-elementary lower bound has been recently uncovered. In order to alleviate this difficulty, various structural and behavioral restrictions have been considered, allowing to relate reachability to properties that are easier to che...
Article
Numerous real-world systems can be modeled with Petri nets, which allow a combination of concurrency with synchronizations and conflicts. To alleviate the difficulty of checking their behaviour, a common approach consists in studying specific subclasses. In the converse problem of Petri net synthesis, a Petri net of some subclass has to be construc...
Preprint
Full-text available
We propose a semi-decision procedure for checking generalized reachability properties, on generalized Petri nets, that is based on the Property Directed Reachability (PDR) method. We actually dene three dierent versions, that vary depending on the method used for abstracting possible witnesses, and that are able to handle problems of increasing dic...
Chapter
Full-text available
We propose a semi-decision procedure for checking generalized reachability properties, on generalized Petri nets, that is based on the Property Directed Reachability (PDR) method. We actually define three different versions, that vary depending on the method used for abstracting possible witnesses, and that are able to handle problems of increasing...
Chapter
In previous studies, several methods have been developed to synthesise Petri nets from labelled transition systems (LTS), often with structural constraints on the net and on the LTS. In this paper, we focus on Weighted Marked Graphs (WMGs) and Choice-Free (CF) Petri nets, two weighted subclasses of nets in which each place has at most one output; W...
Preprint
Full-text available
Petri nets proved useful to describe various real-world systems, but many of their properties are very hard to check. To alleviate this difficulty, subclasses are often considered. The class of weighted marked graphs with relaxed place constraint (WMG=< for short), in which each place has at most one input and one output, and the larger class of ch...
Chapter
Full-text available
Recent studies investigated the problems of analysing Petri nets and synthesising them from labelled transition systems (LTS) with two labels (transitions) only. In this paper, we extend these works by providing new conditions for the synthesis of Weighted Marked Graphs (WMGs), a well-known and useful class of weighted Petri nets in which each plac...
Preprint
Recent studies investigated the problems of analysing Petri nets and synthesising them from labelled transition systems (LTS) with two labels (transitions) only. In this paper, we extend these works by providing new conditions for the synthesis of Weighted Marked Graphs (WMGs), a well-known and useful class of weighted Petri nets in which each plac...
Preprint
In previous studies, several methods have been developed to synthesise Petri nets from labelled transition systems (LTS), often with structural constraints on the net and on the LTS. In this paper, we focus on Weighted Marked Graphs (WMGs) and Choice-Free (CF) Petri nets, two weighted subclasses of nets in which each place has at most one output; W...
Preprint
Full-text available
Recent studies investigated the problems of analysing Petri nets and synthesising them from labelled transition systems (LTS) with two labels (transitions) only. In this paper, we extend these works by providing new conditions for the synthesis of Weighted Marked Graphs (WMGs), a well-known and useful class of weighted Petri nets in which each plac...
Conference Paper
Full-text available
Several works have proposed methods for the analysis and synthesis of Petri net subclasses from labelled transition systems (LTS). In this paper, we focus on Choice-Free (CF) Petri nets, in which each place has at most one output, and their subclass of Weighted Marked Graphs (WMGs). We provide new conditions for the WMG-synthesis from a circular LT...
Article
Full-text available
This paper describes two results within the context of Petri net synthesis from labelled transition systems. We consider a set of structural properties of transition systems, and we show that, given such properties, it is possible to re-engineer a Petri net realisation into one which lies inside the set of marked graphs, a well-understood and usefu...
Conference Paper
Full-text available
Structural approaches have greatly simplified the analysis of intractable properties in Petri nets, notably liveness. In this paper, we further develop these structural methods in particular weighted subclasses of Petri nets to analyze liveness and deadlockability, the latter property being a strong form of non-liveness.
Article
Full-text available
Many real systems and applications, including flexible manufacturing systems and embedded systems, are composed of communicating tasks and may be modeled by weighted Petri nets. The behavior of these systems can be checked on their model early on at the design phase, thus avoiding costly simulations on the designed systems. Usually, the models shou...
Article
Full-text available
Join-Free Petri nets, whose transitions have at most one input place, model systems without synchronizations, while Choice-Free Petri nets, whose places have at most one output transition, model systems without conflicts. These classes respectively encompass the state machines (S-systems) and the marked graphs (T-systems). Whereas a structurally bo...
Conference Paper
Full-text available
A Petri net is reversible if its initial marking is a home marking, a marking reachable from any reachable marking. Under the assumption of well-behavedness we investigate the property of reversibility for strongly connected weighted choice-free Petri nets, nets which structurally avoid conflicts. Several characterizations of liveness and reversibi...
Conference Paper
Full-text available
Join-Free Petri nets, whose transitions have at most one input place, model systems without synchronizations while Choice-Free Petri nets, whose places have at most one output transition, model systems without conflicts. These classes respectively encompass the state machines (or S-systems) and the marked graphs (or T-systems).Whereas a structurall...
Conference Paper
Cyclo-Static DataFlow Graphs (CSDFG in short) is a formalism commonly used to model parallel applications composed by actors communicating through buffers. The liveness of a CSDFG ensures that all actors can be executed infinitely often. This property is clearly fundamental for the design of embedded applications. This paper aims to present first a...

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