An ocarina extension for AADL formal semantics generation

International audienceThe formal veri cation has become a recommended practice in safety-critical software engineering. The hand-written of the for- mal speci cation requires a formal expertise and may become com- plex especially with large systems. In such context, the automatic generation of the formal speci cation seems helpful and reward- ing, particularly for reused and generic mapping such as hardware representations and real-time features. In this paper, we aim to formally verify real-time systems designed by AADL language. We propose an extension AADL2LNT of the Ocarina tool suite allowing the automatic generation of an LNT speci cation to draw a gateway for the CADP formal analysis toolbox. This work is illustrated with the Pacemaker case study

A formal approach to AADL model-based software engineering

Formal methods have become a recommended practice in safety-critical software engineering. To be formally verified, a system should be specified with a specific formalism such as Petri nets, automata and process algebras, which requires a formal expertise and may become complex especially with large systems. In this paper, we report our experience in the formal verification of safety-critical real-time systems. We propose a formal mapping for a real-time task model using the LNT language, and we describe how it is used for the integration of a formal verification phase in an AADL model-based development process. We focus on real-time systems with event-driven tasks, asynchronous communication and preemptive fixed-priority scheduling. We provide a complete tool-chain for the automatic model transformation and formal verification of AADL models. Experimentation illustrates our results with the Flight control system and Line follower robot case studies

48XXYY Syndrome in an Adult with Type 2 Diabetes Mellitus, Unilateral Renal Aplasia, and Pigmentary Retinitis

A 45-year-old male was referred for diabetes mellitus. Clinical examination found a family history of multiple precocious deaths, strong consanguinity, personal history of seizures during childhood, small testicles, small penis, sparse body hair, long arms and legs, dysmorphic features, mental retardation, dysarthria, tremor, and mild gait ataxia. Investigations found pigmentary retinitis, metabolic syndrome, unilateral renal aplasia, and hypergonadotropic hypogonadism, and ruled out mitochondrial cytopathy and leucodystrophy. Karyotype study showed a 48XXYY chromosomal type. Renal aplasia and pigmentary retinitis have not been described in 48XXYY patients. They may be related to the chromosomal sex aneuploidy, or caused by other genetic aberrations in light of the high consanguinity rate in the patient's family

Propriétés arithmétiques des séries formelles sur un corps fini

AIX-MARSEILLE2-BU Sci.Luminy (130552106) / SudocSudocFranceF

Somme des chiffres et répartition dans les classes de congruence pour les palindromes ellipséphiques

International audienceWe generalize several results concerning the distribution in residue classes of the sum of digits function to the case of palindromes with missing digits.L’objet de cet article est de généraliser plusieurs résultats concernant la répartition dans les progressions arithmétiques de la fonction somme des chiffres au cas des nombres palindromes ellipséphiques

Répartition simultanée de S(n) et S(n+1) dans les progressions arithmétiques

International audienceIf q≥2 is an integer, we denote by Sq(n) the sum of the digits in base q of the positive integer n and by vq(n) its q-adic valuation. The goal of this work is to study exponential sums of the form ∑n≤xexp(2iπ(lmSq(n)+km′Sq(n+1)+θn)) in order to prove some statistical properties of integers n for which Sq(n) and Sq(n+1) belong to given arithmetic progressions. This extends the results obtained by Gelfond in 1968 and those obtained by Mauduit–Sárközy in 1996.Si q≥2 est un nombre entier, on désigne par Sq(n) la somme des chiffres en base q du nombre entier naturel n et par vq(n) sa valuation q-adique. L’objectif de cet article est d’étudier des sommes d’exponentielles de la forme ∑n≤xexp(2iπ(lmSq(n)+km′Sq(n+1)+θn)) afin d’en déduire certaines propriétés statistiques des nombres entiers n pour lesquels Sq(n) et Sq(n+1) appartiennent à des progressions arithmétiques données. Ceci permet d’étendre les résultats obtenus par Gelfond en 1968 et ceux obtenus par Mauduit-Sárközy en 1996