218,521 research outputs found
A MARRIAGE OF TRUE MINDS: NICOLA CHIAROMONTE E MELANIE VON NAGEL
No full textIntroduzione al carteggio fra Nicola Chiaromonte e Melanie von Nage
System-on-chip Computing and Interconnection Architectures for Telecommunications and Signal Processing
No full textThis dissertation proposes novel architectures and design techniques targeting SoC building blocks for telecommunications and signal processing applications.
Hardware implementation of Low-Density Parity-Check decoders is approached at both the algorithmic and the architecture level. Low-Density Parity-Check codes are a promising coding scheme for future communication standards due to their outstanding error correction performance.
This work proposes a methodology for analyzing effects of finite precision arithmetic on error correction performance and hardware complexity. The methodology is throughout employed for co-designing the decoder. First, a low-complexity check node based on the P-output decoding principle is designed and characterized on a CMOS standard-cells library. Results demonstrate implementation loss below 0.2 dB down to BER of 10^{-8} and a saving in complexity up to 59% with respect to other works in recent literature. High-throughput and low-latency issues are addressed with modified single-phase decoding schedules. A new "memory-aware" schedule is proposed requiring down to 20% of memory with respect to the traditional two-phase flooding decoding. Additionally, throughput is doubled and logic complexity reduced of 12%. These advantages are traded-off with error correction performance, thus making the solution attractive only for long codes, as those adopted in the DVB-S2 standard. The "layered decoding" principle is extended to those codes not specifically conceived for this technique. Proposed architectures exhibit complexity savings in the order of 40% for both area and power consumption figures, while implementation loss is smaller than 0.05 dB.
Most modern communication standards employ Orthogonal Frequency Division Multiplexing as part of their physical layer. The core of OFDM is the Fast Fourier Transform and its inverse in charge of symbols (de)modulation. Requirements on throughput and energy efficiency call for FFT hardware implementation, while ubiquity of FFT suggests the design of parametric, re-configurable and re-usable IP hardware macrocells. In this context, this thesis describes an FFT/IFFT core compiler particularly suited for implementation of OFDM communication systems. The tool employs an accuracy-driven configuration engine which automatically profiles the internal arithmetic and generates a core with minimum operands bit-width and thus minimum circuit complexity. The engine performs a closed-loop optimization over three different internal arithmetic models (fixed-point, block floating-point and convergent block floating-point) using the numerical accuracy budget given by the user as a reference point. The flexibility and re-usability of the proposed macrocell are illustrated through several case studies which encompass all current state-of-the-art OFDM communications standards (WLAN, WMAN, xDSL, DVB-T/H, DAB and UWB). Implementations results are presented for two deep sub-micron standard-cells libraries (65 and 90 nm) and commercially available FPGA devices. Compared with other FFT core compilers, the proposed environment produces macrocells with lower circuit complexity and same system level performance (throughput, transform size and numerical accuracy).
The final part of this dissertation focuses on the Network-on-Chip design paradigm whose goal is building scalable communication infrastructures connecting hundreds of core. A low-complexity link architecture for mesochronous on-chip communication is discussed. The link enables skew constraint looseness in the clock tree synthesis, frequency speed-up, power consumption reduction and faster back-end turnarounds. The proposed architecture reaches a maximum clock frequency of 1 GHz on 65 nm low-leakage CMOS standard-cells library. In a complex test case with a full-blown NoC infrastructure, the link overhead is only 3% of chip area and 0.5% of leakage power consumption.
Finally, a new methodology, named metacoding, is proposed. Metacoding generates correct-by-construction technology independent RTL codebases for NoC building blocks. The RTL coding phase is abstracted and modeled with an Object Oriented framework, integrated within a commercial tool for IP packaging (Synopsys CoreTools suite). Compared with traditional coding styles based on pre-processor directives, metacoding produces 65% smaller codebases and reduces the configurations to verify up to three orders of magnitude
Nicola Bonacasa e l’insegnamento dell’Archeologia nell’Università di Palermo
No full textSi ripercorre la storia dell'insegnamento di Archeologia nell'Università di Palermo, focalizzando l'attenzione sull'apporto alla sua riorganizzazione da parte di Nicola Bonacasa, a lungo direttore dell'Istituto di Archeologia e presidente dei corsi di studio dell'ambito.It traces the history of the teaching of Archeology at the University of Palermo, focusing attention on the contribution to its reorganization by Nicola Bonacasa, long director of the Institute of Archeology and president of the study courses in the field
Tre domande a Nicola Russi
No full textThe interview is part of an issue of STOA dedicated to design and representation and focuses on theoretical, methodological, and process aspects applied in design education. / L’intervista si inserisce nel volume di STOA dedicato al disegno e alla rappresentazione e descrive alcuni aspetti teorici metodologici e processuali applicati nell’ambito della didattica del progetto
The Role of Coordination and Cooperation for Bt-maize cultivation in Brandenburg, Germany
No full textSince 2006, several varieties of transgenic Bt-maize are approved for commercial cultivation in Germany. The German regulatory framework for growing these crops comprises ex-ante regulations as well as ex-post liability rules to protect conventional and organic farming from possible negative side effects of transgenic plants and to ensure co-existence. Public regulation is also suspected to impose additional costs to those farmers who intend to plant Bt-maize. We address the question how Bt-maize growing farmers perceive the additional costs of regulation and whether coordination or cooperation takes place in order to diminish these costs. In 2006, we carried out a case study in the Oderbruch region (Brandenburg, Germany) comprising eight Bt-maize growing farmers and six adjacent neighbours. The predominantly large farms chose intrafarm coordination to manage the construction of buffer zones within their own fields and to avoid the planting of Bt-maize close to their neighbours. Inter-farm coordination or cooperation with adjacent farmers was not regarded necessary to achieve co-existence.Coordination, Cooperation, Bt-maize, Crop Production/Industries,
Amici miei. Fenomenologia delle relazioni amicali nella società del benessere
No full textRapporto di ricerca. Contributi di P. Di Nicola, D.Secondulfo, C. Biondani e E.Gualand
Prefazione [La fantasia del reale. Esopo e la favola]
No full textNella Prefazione al volume, i due curatori - Nicola Barbieri e Annamaria Contini - ricostruiscono le motivazioni all'origine della lettura della favola in chiave interdisciplinare, discutendo alcune teorie contemporanee e soffermandosi sulle valenze formative del racconto
Credo del Sigr. Nicola Fago a 5. con violini
No full textTitre uniforme : Fago, Nicola (1677-1745). Compositeur. [Credo. Voix (5), choeur (5 voix), orchestre. Si bémol majeur]Titre propre pris au départ. - F. 1 : "Copiato dell'orig[ina]le dell'Autore improntatoni da S. C. di Nicola Carmignano av.re Nap.no // e gran dilettante di musica = 9bre 1797".. - Copiste identifié d'après F-Pn Ms. 2012 et Ms. 2013. - Voix : Ut 1 (2), Ut 3, Ut 4, Fa 4. - Choeur : Ut 1 (2), Ut 3, Ut 4, Fa 4. - Vl 2, bc. - Foliotation ajoutée. - Fait partie d'un recueil factice : f. 143-158 de la foliotation continuePrésentation musicale : [Partition]Incipit : Credo in unum DeumAppartient à l’ensemble documentaire : RISM2Appartient à l’ensemble documentaire : RISMMssCredo (musique) -- +* 1700......- 1799......+:18e siècle
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