Search results for "Ford"
showing 10 items of 785 documents
Fixed-size Quadruples for a New, Hardware-Oriented Representation of the 4D Clifford Algebra
2010
Clifford algebra (geometric algebra) offers a natural and intuitive way to model geometry in fields as robotics, machine vision and computer graphics. This paper proposes a new representation based on fixed-size elements (quadruples) of 4D Clifford algebra and demonstrates that this choice leads to an algorithmic simplification which in turn leads to a simpler and more compact hardware implementation of the algebraic operations. In order to prove the advantages of the new, quadruple-based representation over the classical representation based on homogeneous elements, a coprocessing core supporting the new fixed-size Clifford operands, namely Quad-CliffoSor (Quadruple-based Clifford coproces…
Accelerating Clifford Algebra Operations using GPUs and an OpenCL Code Generator
2015
Clifford Algebra (CA) is a powerful mathematical language that allows for a simple and intuitive representation of geometric objects and their transformations. It has important applications in many research fields, such as computer graphics, robotics, and machine vision. Direct hardware support of Clifford data types and operators is needed to accelerate applications based on Clifford Algebra. This paper proposes a mixed software-hardware system that exploits the computational power of Graphics Processing Units (GPUs) to accelerate Clifford operations. A code generator, namely OpenCLifford, is presented that automatically generates Java and C libraries for the direct support of Clifford ele…
Design Space Exploration of Parallel Embedded Architectures for Native Clifford Algebra Operations
2012
In the past few decades, Geometric or Clifford algebra (CA) has received a growing attention in many research fields, such as robotics, machine vision and computer graphics, as a natural and intuitive way to model geometric objects and their transformations. At the same time, the high dimensionality of Clifford algebra and its computational complexity demand specialized hardware architectures for the direct support of Clifford data types and operators. This paper presents the design space exploration of parallel embedded architectures for native execution of four-dimensional (4D) and five-dimensional (5D) Clifford algebra operations. The design space exploration has been described along wit…
An FPGA Implementation of a Quadruple-Based Multiplier for 4D Clifford Algebra
2008
Geometric or Clifford algebra is an interesting paradigm for geometric modeling in fields as computer graphics, machine vision and robotics. In these areas the research effort is actually aimed at finding an efficient implementation of geometric algebra. The best way to exploit the symbolic computing power of geometric algebra is to support its data types and operators directly in hardware. However the natural representation of the algebra elements as variable-length objects causes some problems in the case of a hardware implementation. This paper proposes a 4D Clifford algebra in which the variable-length elements are mapped into fixed-length elements (quadruples). This choice leads to a s…
Embedded Coprocessors for Native Execution of Geometric Algebra Operations
2016
Clifford algebra or geometric algebra (GA) is a simple and intuitive way to model geometric objects and their transformations. Operating in high-dimensional vector spaces with significant computational costs, the practical use of GA requires dedicated software and/or hardware architectures to directly support Clifford data types and operators. In this paper, a family of embedded coprocessors for the native execution of GA operations is presented. The paper shows the evolution of the coprocessor family focusing on the latest two architectures that offer direct hardware support to up to five-dimensional Clifford operations. The proposed coprocessors exploit hardware-oriented representations o…
Difetto del nesso causale e manifesta insussistenza del fatto nel licenziamento per giustificato motivo oggettivo
2021
Con la sentenza n. 16253/2020 la Suprema Corte ha affermato che l’assenza di nesso causale tra la cessazione di un appalto e il licenziamento del lavoratore integra un’ipotesi di manifesta insussistenza del fatto posto alla base del licenziamento - con conseguente applicabilità della tutela reintegratoria attenuta di cui all’art. 18, comma 5, della legge n. 300/1970 - non riconducibile, pertanto, agli altri casi in cui il giudice dichiara risolto il rapporto concedendo la sola tutela indennitaria forte (da dodici a ventiquattro mensilità).
La critica radicale tra previsione concreta e regolazione capitalistica. Considerazioni sull’efficacia specifica del movimento del ’77 nel processo d…
2012
L’analisi delle “espressioni” culturali delle riconfigurazioni del modo di produzione capitalistico, autorizzata da ogni “scienza della cultura” educata sulle elaborazioni di Antonio Gramsci e Walter Benjamin, ovvero sulle pratiche teoriche che hanno abolito, all’interno della “critica delle ideologie” marxista, le schematizzazioni meccanicistiche dell’inflazionato “rapporto” intercorrente tra produzione materiale e produzione culturale – il cui determinismo, seppur mediato dalla parziale correzione del principio dell’ultima istanza engelsiano, è forse suggerito dalla stessa metafora architettonica proposta da Marx – si avvale di ulteriori attestati di fecondità nel “caso”, in questa occasi…
Le affordances cognitive e sociali in Internet. Un confronto cross-culturale tra utenti italiani e americani.
2008
Internet può essere descritto come un ambiente caratterizzato da affordances ovvero da “offerte” psico-tecnologiche che amplificano le capacità cognitive e sociali degli utenti. In particolare, i molteplici strumenti informativi del web sono riconducibili alle sue affordances cognitive, laddove quelli più connotati in senso interpersonale (p.e. chat-room) ne costituiscono le affordances sociali. Allo scopo di esplorare l’utilizzo delle suddette affordances in differenti popolazioni, abbiamo condotto un’indagine che confronta un gruppo di italiani ed uno di statunitensi tramite la somministrazione di un questionario online. I risultati indicano che, nonostante la sua più recente introduzione…
On the Dunford property (C) for bounded linear operators SR and RS
2011
In this paper we show that if S in L(X; Y ) and R in L(Y;X), X and Y complex Banach spaces, then the products RS and SR share the Dunford property (C)
Benford's Law for economic data reliability: The case of tourism flows in Sicily
2023
This paper proposes a data science approach based on Benford's Law to analyse tourist flows – being tourism a relevant economic sector in Sicily. In particular, we are interested in detecting irregular patterns in the numerical data that may represent manipulations, inaccuracies or biases in the self-reported data from tourism organisations. The analysis is carried out by using monthly data for arrivals and overnight stays in hotels, B&Bs, and complementary accommodations in the seven provinces of the island from January 2016 to December 2019. We perform the analysis by employing several statistical tests and through a visual inspection of the difference between the empirical distributi…