A Computation Core for Communication Refinement of Digital Signal Processing Algorithms

International audienceThe most popular Moore's law formulation, which states the number of transistors on integrated circuits doubles every 18 months, is said to hold for at least another two decades. According to this prediction, if we want to take advantage of technological evolutions, designer's productivity has to increase in the same proportions. To take up this challenge, system level design solutions have been set up, but many efforts have still to be done on system modelling and synthesis. In this paper we propose a computation core synthesis methodology that can be integrated on the communication refinement steps of electronic system level design tools. In the proposed approach, computation cores used for digital signal processing application specifications relying on coarse grain communications and synchronizations (e.g. matrix) can be refined into computation cores which can handle fine grain communications and synchronizations (e.g. scalar). Its originality is its ability to synthesize computation cores which can handle fine grain data consumptions and productions which respect the intrinsic partial orders of the algorithms while preserving their original functionalities. Such cores can be used to model fine grain input output overlapping or iteration pipelining. Our flow is based on the analysis of a fine grain signal flow graph used to extract fine grain synchronizations and algorithmic expressions

Design exploration and HW/SW rapid prototyping for real-time system design

Embedded signal processing systems are usually associated with real-time constraints and/or high data rates such that fully software implementation are often not satisfactory. In that case, mixed hardware/software implementations are to be investigated. However the increasing complexity of current applications makes classical design processes time consuming and consequently incompatible with an efficient design space exploration. To address this problem, we propose a system-level design based methodology that aims at unifying the design flow from the functional description to the physical HW/SW implementation through functional and architectural flexibility. Our approach consists in automatically refining high abstraction level models through the use of an electronic system-level (ESL) design tool according to function models from the one hand and prototyping platform models from the other hand. We illustrate our methodology with the design of a wireless communication system. We provide design results showing the variety of dedicated architectures that can be investigated with this design flow

Hardware communication refinement in digital signal processing, modelling issues

In this paper we present the different modelling problems which a Digital Signal Processing (DSP) application designer has to tackle while refining an abstract specification relying on coarse grain data (e.g. matrices) toward a hardware implementation model relying on fine grain data (e.g. scalar). To address this problematic, we propose a modelling framework which can be used to refine an algorithm specified with coarse grain interfaces to a form which allow, from the functionnality point of view, to model all its fine grain hardware implmentation

Buts d'accomplissement de soi et jugement métacognitif des aides en EIAH

International audienceLe but de cette étude est d'étudier l'effet des buts d'accomplissement de soi et des jugements métacognitifs de l'individu sur sa recherche d'aide instrumentale ou exécutive au sein d'un site web d'apprentissage en statistique. 49 étudiants ont participé à l'étude. Les résultats montrent que (1) le but de maîtrise est lié positivement à la recherche d'aide instrumentale et positivement à la recherche d'aide exécutive de l'apprenant, (2) le but de performance d'évitement est lié négativement à la recherche d'aide exécutive, (3) la perception d'une menace sur son besoin d'autonomie est lié négativement à la recherche d'aide instrumentale, (4) la perception d'une menace sur ses compétences est reliée négativement à la recherche d'aide exécutive

Concrush: Understanding fugitive dust production and potential emission at a recycled concrete manufacturing facility

The production and emission of fugitive dust is a topic ofconcern that Concrush brought to the MISG, 2020. Concrushis recycled concrete manufacturing company in the Hunterregion of New South Wales. Concrush's operations producefugitive dust, fine particles that can escape the site. Fugitive dust can travel long distances from the site ofemission, and can have negative health impacts includingrespiratory illnesses. Presently, concrete recyclingfacilities are managed by the Environmental ProtectionAgency using guidelines initially developed for the coalindustry. Concrush seeks to understand the appropriatenessof these guidelines, and how they can reduce and managefugitive dust on their Teralba site. Mathematical modellingof dust emission and transport, together with a review ofsimilar processes in the literature, identified a number ofpractical options for Concrush to reduce their dustemissions. In addition, opportunities for improved datacollection are identified

Granite intrusion in a metamorphic core complex: The example of the Mykonos laccolith (Cyclades, Greece)

International audienceThe Aegean domain is a well-suited place to study the formation of metamorphic core complex (MCC) and to investigate the role of syn-tectonic granites on their development. In the northern Cyclades, the Mykonos-Delos-Rhenia MCC is characterised by the intrusion of a kilometer-scale Late Miocene pluton of I-type granitoids within a migmatitic gneiss dome. New combined AMS (Anisotropy of Magnetic Susceptibility) and microstructural studies on the Mykonos granitoids together with recently published thermochronological data allow us to use the granitoids as strain markers. The Mykonos granitoids form a laccolith-like intrusion with a N70°E long axis. The laccolith is strongly asymmetric with an outlying root zone to the SW and a major body mainly developed to the NE. The laccolith construction is due to successive pulses of more or less differentiated magma that intruded the Cycladic Blueschist Unit. The attitude of stretching markers suggests an important (about 60°) vertical-axis local rotation phenomenon in the cycladic upper crust during the exhumation of the Mykonos MCC. Structural data suggest a four-stage evolution of the Mykonos MCC: (i) a first stage characterized by flat shearing toward the N-NE and by the formation of a domal structure in migmatitic paragneisses with multi-scale generation of folds with axes either perpendicular or parallel to the regional stretching, as a result of the interplay between regional N20E°-directed extension and EW shortening; (ii) a second stage marked by the emplacement of the Mykonos laccolith at 13.5 ± 0.3 Ma at the top of the migmatitic paragneisses; (iii) the third stage corresponding to the development of protomylonitic foliations and lineations in the whole laccolith in high to medium temperature conditions; (iv) the late stage marked by an acceleration of the exhumation of the Mykonos MCC. This exhumation was accommodated by important rotations of upper crustal blocks. During the end of the exhumation processes, around 10 Ma, deformation localized at the top of the laccolith in semi-ductile conditions and then in brittle conditions in the major detachment plane. Our study shows that the Cycladic plutonism event had no role on the initiation of the MCC. However, the geometry of the Mykonos intrusion supports that the magmas are "sucked" into the direction of regional extension and that the intrusion of magmas has caused an acceleration of the last stages of the MCC development. This acceleration was marked by a very fast exhumation of the laccolith after its emplacement

The North Cycladic Detachment System

International audienceLow-angle normal faults accommodate a large part of continental post-orogenic extension. Besides the intrinsic rheological characteristics of the continental crust that may lead to the formation of shallow-dipping shear zones at the brittle–ductile transition, the role of pre-existing low-angle structures such as large thrusts has been proposed by several authors. We explore this question with the example of the North Cycladic Detachment System (NCDS) that is composed of a series of distinct detachments cropping out on the islands of Andros, Tinos and Mykonos, separating the Cycladic Blueschists in the footwall from the Upper Cycladic Nappe in the hanging wall. We show that these extensional structures are part of a single large-scale structure (more than 200 km along strike) that reactivates the Vardar suture zone. It extends eastward on Ikaria and westward offshore Evia and Thessalia where it probably connects to recent shallow-dipping normal faults evidenced on published seismic reflection profiles. The NCDS started its activity in the Oligocene concommitantly with the Aegean extension, and was still active in the Late Miocene. It has exhumed a series of metamorphic domes from southern Evia to Mykonos below low-angle detachment systems, made of low-angle normal faults and low-angle ductile shear zones. The ductile shear zones and the faults were created with a low dip and they kept the same attitude throughout their exhumation. We identify three main detachments that are part of a continuum of extension on the NCDS : Tinos detachment, Livada detachment and Mykonos detachment. A fourth detachment (Vari detachment) is the reactivation of an Eocene exhumation-related structure. Deformation in the footwall is characterized by intense stretching and flattening. Using the spatial evolution observed along strike from Andros to Mykonos we construct a history of formation of the NCDS starting with the reactivation of former thrusts leading to the exhumation of high-temperature metamorphic domes. The Aegean example shows that reactivation of earlier shallow-dipping discontinuities can play a fundamental role in continental post-orogenic extension

Réinventer la pédagogie des opprimé·e·x·s pour développer une approche dialogique de l’art contemporain

Au-delà de la réception bien documentée de l’œuvre de Paulo Freire dans les champs des pédagogies émancipatrices, de l’alphabétisation ou encore des sciences de l’éducation, ses textes ont également connu un destin élargi dans le domaine de l’art – dans les processus de production artistique, l’éducation à l’art et/ou par l’art. Ce texte propose de revenir sur le projet « Réinventer la pédagogie des opprimé·e·x·s pour favoriser la participation culturelle dans les institutions d’art contemporain suisses (janvier 2021-janvier 2023) » (RPO). Cette réinvention a consisté en une relecture de Freire entre les membres de notre équipe de recherche, quatre collectifs ou associations dans quatre institutions artistiques en Suisse francophone, en vue de réengager sa pensée dans un projet d’émancipation. Les quatre groupes ayant collaboré au projet se distinguent par les formes d’engagement et leur taille. Les quatre institutions d’art contemporain se distinguent elles aussi par leur dimension, leur ancrage géographique et leurs modalités de gestion. Projet à géométrie variable, cette expérience révèle différentes inflexions des inédits possibles ouverts par la pensée de Paulo Freire, chaque projet soulignant en effet un point saillant de l’expérience d’émancipation.Para além de receção bem documentada de Paulo Freire no horizonte das pedagogias emancipatórias, da alfabetização e das ciências da educação, os seus textos tiveram um destino alargado no campo da arte – nos processos de produção artística, educação artística e/ou através da arte. Este texto propões revisitar o projeto “Reinventar a pedagogia para os oprimidos para promover a participação cultural nas instituições de arte contemporânea suíças (janeiro de 2021 a janeiro de 2023)” (RPO). Esta reinvenção consistiu numa reinterpretação de Freire entre os membros da nossa equipa de pesquisa, quatro coletivos ou associações em quatro instituições artísticas na Suíça francófona, com o objetivo de reenquadrar o seu pensamento num projeto de emancipação. Os quatro grupos que colaboraram no projeto distinguem-se pelas formas de compromisso e pelo tamanho. As quatro instituições de arte contemporânea também se destacam pela sua dimensão, localização geográfica e modalidades de gestão. Projeto de geometria variável, esta experiência revela diferente inflexões das possibilidades inéditas abertas pelo pensamento de Freire, sendo que cada projeto destaca um ponto saliente da experiência de emancipação.Beyond the well-documented reception of Paolo Freire’s work in the realm of emancipatory pedagogies, literacy, and education sciences, his texts have also found an expanded destiny in the field of art – within processes of artistic production, art education, and/or through art itself. This text aims to revisit the project “Reinventing the Pedagogy of the Oppressed to Foster Cultural Participation in Swiss Contemporary Art Institutions (January 2021-January 2023)” (RPO). This reinvention consisted of a reinterpretation of Freire among the members of our research team, four collectives or associations in four artistic institutions in French-speaking Switzerland, with the aim of reengaging his ideas in a project of emancipation. The four groups that collaborated on the project are distinguished by their forms of commitment and their size. The four contemporary art institutions also distinguish themselves by their size, geographic location, and management methods. A project with variable geometry, this experience reveals different inflections of the possible innovations opened up by Freire’s work, with each highlighting a salient point of the emancipation experience