Modelling and Simulation of Asynchronous Real-Time Systems using Timed Rebeca

In this paper we propose an extension of the Rebeca language that can be used to model distributed and asynchronous systems with timing constraints. We provide the formal semantics of the language using Structural Operational Semantics, and show its expressiveness by means of examples. We developed a tool for automated translation from timed Rebeca to the Erlang language, which provides a first implementation of timed Rebeca. We can use the tool to set the parameters of timed Rebeca models, which represent the environment and component variables, and use McErlang to run multiple simulations for different settings. Timed Rebeca restricts the modeller to a pure asynchronous actor-based paradigm, where the structure of the model represents the service oriented architecture, while the computational model matches the network infrastructure. Simulation is shown to be an effective analysis support, specially where model checking faces almost immediate state explosion in an asynchronous setting.Comment: In Proceedings FOCLASA 2011, arXiv:1107.584

Sémantiques avec Skel et Necro

International audienceWe present Skel, a meta language designed to describe the semantics of programming languages, and Necro, a set of tools to manipulate said descriptions. We show how Skel, although minimal, can faithfully and formally capture informal specifications. We also show how we can use these descriptions to generate OCaml interpreters and Coq formalizations of the specified languages.Nous présentons Skel, un méta-langage pour décrire les sémantiques de langages de programmation, et Necro, un ensemble d'outils pour manipuler lesdites descriptions. Nous montrons comment Skel, bien que minimal, peut capturer formellement et fidèlement des spécifications informelles. Nous montrons aussi comment on peut utiliser ces descriptions pour générer des interpréteurs OCaml et des formalisation Coq des langages spécifiés

Quantum Walks on Strongly Regular Graphs

This thesis studies the transition matrix of a quantum walk on strongly regular graphs. It is proposed by Emms, Hancock, Severini and Wilson in 2006, that the spectrum of a matrix based on the amplitudes of walks in the quantum walk, distinguishes strongly regular graphs. We begin by finding the eigenvalues of matrices describing the quantum walk for regular graphs. We also show that if two graphs are isomorphic, then the corresponding matrices produced by the procedure of Emms et al. are cospectral. We then look at the entries of the cube of the transition matrix and find an expression for the matrices produced by the procedure of Emms et al. in terms of the adjacency matrix and incidence matrices of the graph

31ème Journées Francophones des Langages Applicatifs

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