3,152 research outputs found
Modularità e architettura adattiva. Una strategia per la gestione di sistemi d’involucro complessi - Modularity and adaptive architecture. A strategy for managing complex envelope systems
No full textA fronte del cambiamento climatico globale all’ambiente costruito è ascrivibile un crescente fabbisogno energetico per il mantenimento di condizioni di benessere indoor. L’architettura adattiva, ispirata al pensiero sistemico e alla biomimetica, può dar vita a organismi edilizi complessi che rispondono dinamicamente alle sollecitazioni ambientali attraverso la modulazione della fisicità del proprio involucro, riducendo il dispendio energetico per la climatizzazione. L’illustrazione di un quadro rappresentativo di progetti e ricerche evidenzia il ruolo della modularità nell’architettura adattiva in termini di principi di funzionamento, modalità di controllo, modalità di risposta, complessità funzionale e strutturale. Il contributo mette in luce la centralità della modularità quale strategia per affrontare la complessità multidimensionale dei sistemi tecnologici per l’involucro adattivo
Comunità energetiche. Strumento per riqualificare l'edilizia della ricostruzione post-bellica
No full textNel 2050 circa l’80% del parco edilizio europeo sarà costituito da edifici attualmente in uso. In Italia, una quota consistente di tale patrimonio è stata realizzata nella ricostruzione postbellica con il piano Ina Casa, programma di edilizia sociale che risolse problemi quali la disoccupazione e la domanda abitativa. Logiche costruttive improntate alla tradizione e al risparmio guidarono la realizzazione di architetture che oggi non soddisfano i requisiti del Green Deal europeo, la cui gestione è onerosa a causa della crisi energetica. Il desiderio di riqualificare tale patrimonio sollecita l’adozione di nuovi strumenti come le comunità energetiche, modelli partecipativi per la gestione dell’energia che conseguono un assetto energetico sostenibile e promuovono lo sviluppo socioeconomico
An assessment of the impact of possible CAP reform scenarios on Romanian agriculture
No full textUsing a simplified model, with key-variable the prices of two different possible scenarios of CAP reform after 2013 (moderate and radical), this paper present a comparison between the price effects of implementation of each reform scenario at 2015 horizon on Romanian agriculture. This short analysis shows that, under the presented hypotheses, the net welfare effect, due to the price changes, for the selected products, is positive in both reform scenarios, yet greater in the case of the radical reform. Integrated in the large context of Romanian development, it seems that the influence of CAP reform upon agriculture and rural areas will be most likely a gradual one: an interpenetration between the two scenarios is foreseeable, starting with the moderate reform that will dominate the period around 2013, the reform measures acquiring a more radical character afterwards.CAP reform, Romania, welfare effects, Agricultural and Food Policy,
Il progetto esecutivo come modello integrato in relazione all’Industria 4.0 .- The executive project as integrated model in relation to Industry 4.0
No full textIl progetto esecutivo deve garantire la sicura interpretazione delle prescrizioni tecniche per la corretta realizzazione dell’opera edilizia. In relazione all’incipiente automazione del cantiere, conseguente allo sviluppo dell’Industria 4.0 fondata su sistemi ciberfisici, muta la grammatica del progetto di dettaglio. Il dibattito descritto si incentra sull’integrazione informativa tra produzioni on-site e off-site e tra operatori umani, macchine e sensoristica. Lo studio esplora e aggiorna lo stato dell’arte della ricerca sull’automazione dei processi costruttivi. Su tali basi definisce un modello di gestione informativa di processi integrati che abbraccia l’intero processo edilizio (Integrated Design Process, Construction Management e Facility Management) predisposto per la condivisione in cloud
Rich, Sturmian, and trapezoidal words
No full textIn this paper we explore various interconnections between rich words, Sturmian words, and trapezoidal words. Rich words, first introduced by the second and third authors together with J. Justin and S. Widmer, constitute a new class of finite and infinite words characterized by having the maximal number of palindromic factors. Every finite Sturmian word is rich, but not conversely. Trapezoidal words were first introduced by the first author in studying the behavior of the subword complexity of finite Sturmian words. Unfortunately this property does not characterize finite Sturmian words. In this note we show that the only trapezoidal palindromes are Sturmian. More generally we show that Sturmian palindromes can be characterized either in terms of their subword complexity (the trapezoidal property) or in terms of their palindromic complexity. We also obtain a similar characterization of rich palindromes in terms of a relation between palindromic complexity and subword complexity
Il progetto biomimetico. Eteronomia ed autopoiesi nell’integrazione tra tecnologia e biologia
No full textL’applicazione del pensiero sistemico alla risoluzione della complessità nel progetto biomimetico consente di pervenire all’integrazione tecnologica tra sistemi biologici ed artificiali, realizzando un organismo edilizio autopoietico. L’emulazione della Natura nel progetto esige la contaminazione e l’ibridazione dei saperi. Le soluzioni di tipo meccanico o quelle legate alle proprietà dei materiali non sono le sole a cui l’architettura adattiva può fare ricorso nel replicare i processi naturali. Si illustrano esperienze che applicano, sia alla scala del manufatto architettonico sia alla scala urbana, strategie adattive autopoietiche del mondo naturale mediante l’integrazione tra tecnologia e biologia, al fine di mettere in luce il nesso tra progetto biomimetico ed eteronomia disciplinare
Characterization Results for the Poset Based Representation of Topological Relations - I: Introduction and Models
No full text@article{DBLP:journals/informaticaSI/ForlizziN99,
author = {Luca Forlizzi and
Enrico Nardelli},
title = {Characterization Results for the Poset Based Representation
of Topological Relations - I: Introduction and Models.},
journal = {Informatica (Slovenia)},
volume = {23},
number = {2},
year = {1999},
bibsource = {DBLP, http://dblp.uni-trier.de}
Characterization Results for the Poset Based Representation of Topological Relations - II: Intersection and Union
No full text@article{DBLP:journals/informaticaSI/ForlizziN00,
author = {Luca Forlizzi and
Enrico Nardelli},
title = {Characterization Results for the Poset Based Representation
of Topological Relations - II: Intersection and Union.},
journal = {Informatica (Slovenia)},
volume = {24},
number = {1},
year = {2000},
bibsource = {DBLP, http://dblp.uni-trier.de}
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
- …
