Uniformization of affine dependence programs for parallel embedded system design

This paper is concerned with the uniformization of a system of afine recurrence equations. This transformation is used in the design (or compilation) of highly parallel embedded systems (VLSI systolic arrays, signal processing filters, etc.). In this paper, we present and implement an automatic system to achieve uniformization of systems of afine recurrence equations. We unify the results from many earlier papers, develop some theoretical extensions, and then propose effective uniformization algorithms. Our results can be used in any high level synthesis tool based on polyhedral representation of nested loop computations.

Getting on top of things: form and meaning in the pseudo-Vergilian Aetna

This article offers a fresh view on the poetics of the pseudo-Vergilian poem Aetna, proposing a carefully planned and executed structure which is supported through a deliberate arrangement of key terms in the poem as well as a network of verbal cross-references

On Rememberance of Things Past: Woodstock and the Counterculture

The natural disposition of mankind is to want Utopia. In literature from the very beginning, from our most primitive to our most sophisticated verses, from the pens of atheists to acolytes, the human spirit has always scratched out, searched, even longed, for Utopias. When Utopias can somehow be linked to a political entity, the subsequent delirium from would-be followers numbers millions.

2D evaluation of crack openings using smeared and embedded crack models

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Characterization of silica-carbon mesoporous matrix with embedded nickel nanoparticles synthesized by the polymeric precursor method

Nickel nanoparticles into silica-carbon matrix composites were prepared by using the polymeric precursor method. The effects of the polyester type and the time of pyrolysis on the mesoporosity and nickel particle dispersion into non-aqueous amorphous silica-carbon matrix were investigated by thermogravimetric analysis, adsorption/desorption isotherms and TEM. A well-dispersed metallic phase could be only obtained by using ethylene glycol. Weightier polyesters affected the pyrolysis process due to a combination of more amounts of carbonaceous residues and delaying of pyrolysis process. The post-pyrolyzed composites were successfully cleaned at 200 degrees C for I h in oxygen atmosphere leading to an increase in the surface area and without the occurrence of carbon combustion or nickel nanoparticles oxidation. The matrix composites presented predominantly mesoporous with pore size well defined in 38 angstrom, mainly when tetraethylene glycol was used as polymerizing agent. (C) 2007 Elsevier B.V. All rights reserved.

The new digital revolution: From the consumer Internet to the industrial Internet

The new digital technologies have led to widespread use of cloud computing, recognition of the potential of big data analytics, and significant progress in aspects of the Internet of Things, such as home automation, smart cities and grids and digital manufacturing. In addition to closing gaps in respect of the basic necessities of access and usage, now the conditions must be established for using the new platforms and finding ways to participate actively in the creation of content and even new applications and platforms. This message runs through the three chapters of this book. Chapter I presents the main features of the digital revolution, emphasizing that today’s world economy is a digital economy. Chapter II examines the region’s strengths and weaknesses with respect to digital access and consumption. Chapter III reviews the main policy debates and urges countries to take a more proactive approach towards, for example, regulation, network neutrality and combating cybercrime. The conclusion highlights two crucial elements: first, the need to take steps towards a single regional digital market that can compete in a world of global platforms by tapping the benefits of economies of scale and developing network economies; and second, the significance of the next stage of the digital agenda for Latin America and the Caribbean (eLAC2018), which will embody the latest updates to a cooperation strategy that has been in place for over a decade.

Contribución al estudio de estrategias de acceso al medio en redes ópticas no guiadas

Programa de doctorado: Cibernética y telecomunicación

Hardware/Software Design of Dynamic Real-Time Schedulers for Embedded Multiprocessor Systems

The new generation of multicore processors opens new perspectives for the design of embedded systems. Multiprocessing, however, poses new challenges to the scheduling of real-time applications, in which the ever-increasing computational demands are constantly flanked by the need of meeting critical time constraints. Many research works have contributed to this field introducing new advanced scheduling algorithms. However, despite many of these works have solidly demonstrated their effectiveness, the actual support for multiprocessor real-time scheduling offered by current operating systems is still very limited. This dissertation deals with implementative aspects of real-time schedulers in modern embedded multiprocessor systems. The first contribution is represented by an open-source scheduling framework, which is capable of realizing complex multiprocessor scheduling policies, such as G-EDF, on conventional operating systems exploiting only their native scheduler from user-space. A set of experimental evaluations compare the proposed solution to other research projects that pursue the same goals by means of kernel modifications, highlighting comparable scheduling performances. The principles that underpin the operation of the framework, originally designed for symmetric multiprocessors, have been further extended first to asymmetric ones, which are subjected to major restrictions such as the lack of support for task migrations, and later to re-programmable hardware architectures (FPGAs). In the latter case, this work introduces a scheduling accelerator, which offloads most of the scheduling operations to the hardware and exhibits extremely low scheduling jitter. The realization of a portable scheduling framework presented many interesting software challenges. One of these has been represented by timekeeping. In this regard, a further contribution is represented by a novel data structure, called addressable binary heap (ABH). Such ABH, which is conceptually a pointer-based implementation of a binary heap, shows very interesting average and worst-case performances when addressing the problem of tick-less timekeeping of high-resolution timers.

Un'applicazione mobile per controllo e monitoraggio della qualità dell'acqua di una piscina

Questo elaborato ha come argomento lo sviluppo di un progetto informatico creato per mettere in comunicazione tra di loro un sistema di gestione e controllo del ricambio di acqua in una piscina e un dispositivo mobile. Per la realizzazione del sistema di controllo è stata utilizzata una scheda Arduino Mega 2560 munita di modulo Ethernet, mentre, per quello che concerne il dispositivo mobile, la scelta è ricaduta su un device dotato di sistema operativo Android. La comunicazione tra questi due attori è mediata attraverso un server scritto in Java che gira nella stessa rete locale in cui è presente la scheda Arduino. Il progetto può essere inserito nell'ambito dell'Internet of Things, dove ogni oggetto è caratterizzato dalla possibilità di connettersi ad Internet e scambiare informazioni con ogni altro oggetto creando una rete. Questo progetto è suddiviso in tre parti: la prima si occupa della definizione di due protocolli di comunicazione tra le varie componenti, uno per lo scambio di messaggi tra client Android e Server Java e un secondo per quello tra scheda Arduino e Server; la seconda parte è incentrata sulla realizzazione del server Java che rende accessibile la scheda da qualsiasi luogo e permette la raccolta dei dati rilevanti provenienti dalla centralina. L’ultima parte infine è quella relativa allo sviluppo di una applicazione per Android che permette di monitorare il tutto e interagire con la centralina stessa.

Midi networking: Metodologie di interconnessione di strumenti musicali tramite reti fisiche e virtuali

Il lavoro che si presenta ha la principale funzione di proporre un metodo di interconnessione di strumenti musicali digitali che utilizzi i più comuni protocolli e strumenti hardware di rete. Nell'ottica di Internet of Things, si vuole rendere MIDI un sotto-protocollo di rete.