1869 research outputs found
Sort by
Domains and context: first steps towards managing diversity in knowledge
No full textDespite the progress made, one of the main barriers towards the use of semantics is the lack of background knowledge. Dealing with this problem has turned out to be a very difficult task because on the one hand the background knowledge should be very large and virtually unbound and, on the other hand, it should be context sensitive and able to capture the diversity of the world, for instance in terms of language and knowledge. Our proposed solution consists in addressing the problem in three steps: (1) create an extensible diversity-aware knowledge base providing a continuously growing quantity of properly organized knowledge; (2) given the problem, build at run-time the proper context within which perform the reasoning; (3) solve the problem. Our work is based on two key ideas. The first is that of using domains, i.e. a general semantic-aware methodology and technique for structuring the background knowledge. The second is that of building the context of reasoning by a suitable combination of domains. Our goal in this paper is to introduce the overall approach, show how it can be applied to an important use case, i.e. the matching of classifications, and describe our first steps towards the construction of a large scale diversity-aware knowledge base. "This is the author’s version of a work that was accepted for publication in . Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Web Semantics: Science, Services and Agents on the World Wide Web, http://dx.doi.org/10.1016/j.websem.2011.11.007.
Load Time Security Verification: The Claim Checker
No full textModern multi-application smart cards can become an integrated environment where applications from different providers are loaded on the fly and collaborate in order to facilitate lives of the cardholders. This initiative requires an embedded verification mechanism to ensure that all applications on the card respect the application interactions policy. The Security-by-Contract approach for loading time verification consists of two phases. During the first phase the loaded code is verified to be compliant with the supplied contract. Then, during the second phase the contract is matched with the smart card security policy. The report focuses on the first phase and describes an algorithm for static analysis of the loaded bytecode on Java Card. We also report about implementation of this algorithm that can be embedded on a real smart card
Evoluzione tecnologica e mutamento del concetto di plagio nella musica = Technological evolution and change of the notion of plagiarism in music
No full textQuesto lavoro si propone di analizzare il mutamento del concetto di plagio nel diritto d’autore alla luce dell’evoluzione tecnologica, in particolare in seguito alla digitalizzazione dei contenuti. La progressiva standardizzazione della popular music e le tecnologie informatiche, che rimettono in discussione l’architettura del sapere, inducono ad interrogarsi se il diritto d’autore possa ancora fungere da mezzo di bilanciamento di interessi contrapposti: da una parte, l’autore e l’incentivo a creare, attraverso la tutela dell’esclusiva; dall’altra, il pubblico e l’accesso alla cultura, mediante la limitazione dello ius excludendi. Nel primo capitolo si analizza il rapporto tra creatività musicale, memorizzazione e trasmissione della performance artistica nel tempo e nello spazio. Dalla notazione alfabetica alla riproduzione stereofonica, il cammino di ricerca della fissazione e riproduzione del suono volge ora verso nuovi obiettivi: la dematerializzazione dei contenuti e la facilità di diffusione. La digitalizzazione, oltre a perseguire tali obiettivi, rende la manipolazione della musica estremamente semplice e alla portata di tutti; si affronta l’analisi delle importanti conseguenze sul rapporto autore-opera e sul problema del plagio. La stessa natura evanescente dell’arte musicale determina difficoltà fisiologiche nella ricerca di soluzioni giuridiche efficaci in questo ambito. Il secondo capitolo affronta le particolarità del modello statunitense di copyright, soprattutto in riferimento ad una nuova pratica musicale, il sampling, vero banco di prova per comprendere le possibilità di adattamento del diritto alle nuove modalità espressive. Nel terzo ed ultimo capitolo si analizza il sistema italiano del diritto d’autore in riferimento al problema del plagio musicale. La giurisprudenza, relativamente alle nuove tecnologie, non si è sviluppata con la la stessa importanza riscontrata negli Stati Uniti, ma attraverso l’analisi dei dati a disposizione si può valutare come le soluzioni dei giudici italiani risultino, in prospettiva, efficaci, anche alla luce dell’attività di armonizzazione della Comunità Europea. ENGLISH ABSTRACT The intention of this work is to analyze the shift in the meaning of plagiarism in copyright, focusing on the technological evolution, especially as a result of the digitalization of content. The progressive standardization of popular music and the digital technologies, which question the whole existence of the architecture of knowledge that were developed throughout history, induce to wonder if copyright is the right mean to balance the different interests. On the one hand the author and his incentive to create through the protection of his exclusive rights and on the other hand the right of the public audience to be a part of the culture despite the limitations imposed by the author’s rights. The work is divided into three chapters and starts with the focus on the historical reasons behind the arising of copyrights and the invention of printing machine. The second chapter analyzes the peculiarity of the American law system in relation to copyright issues, especially through the leading cases concerning new models of expression, such as ‘sampling’. The third chapter deals with the Italian model of the ‘droit d’auteur’ in relation to the dispute arising from the impact of new technologies in the world of popular music. Questo paper © Copyright 2011 by Andrea Trevisan è pubblicato con Creative Commons Attribuzione-Non commerciale-Non opere derivate 2.5 Italia License. Maggiori informazioni circa la licenza all’URL: <http://creativecommons.org/licenses/by-nc-nd/2.5/it/
Acqua e diritto romano: "invenzione" di un modello?
No full textIl paper affronta il problema delle condizioni di configurabilità dell'acqua come bene dotato di una disciplina autonoma, nelle fonti romane e nella tradizione romanistica
A DVBH/GSM/UMTS Planar Antenna for Multimode Wireless Devices
No full textIn this letter, the prototype of a planar antenna working in three different frequency bands and suitable to be integrated in multimode wireless devices is described. The antenna is fed by a single RF port without any matching circuit and it operates in a DVBH channel and at GSM and UMTS frequency bands. Its dimension is of 0.15 lambda at the lower frequency band. The effectiveness and feasibility of the proposed antenna is assessed by means of both simulations and measurements. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works
Particle Density Retrieval in Random Media Using a Percolation Model and a Particle Swarm Optimizer
No full textThis letter is a rst attempt to apply a percolation theory model to the estimation of the density of particles in complex layered two-dimensional media from electromagnetic measurements. A procedure based on an analytical closed-form description of the wave propagation process is presented. The problem is recast as an iterative optimization one and solved by means of a particle swarm optimizer. Numerical experiments show the validity of the proposed solution. (c) 2007 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works
Percolation-Based Models for Ray-Optical Propagation in Stochastic Distributions of Scatterers with Random Shape
No full textThis letter deals with ray propagation in stochastic distributions of discrete scatterers having random shapes. The propagation medium is described by means of a semiin nite percolating lattice and two different propagation models are considered. The propagation depth inside the medium is analytically estimated in terms of the probability that a ray reaches a prescribed level before being reected back in the above empty half-plane. A comparison with Monte-Carlo-like experiments validate the proposed solutions. Applications are in wireless communications, remote sensing, and radar engineering. (c) 2007 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works
Fully-interleaved linear arrays with predictable sidelobes based on almost difference sets
No full textThe present study proposes an analytical technique based on almost difference sets (ADSs) for the design of interleaved linear arrays with well-behaved and predictable radiation features. Thanks to the mathematical properties of ADSs, such a methodology allows the design of interlaced arrangements with peak sidelobe levels (PSLs) only dependent on the aperture size, the number of elements of each subarray and the behaviour of the autocorrelation function of the ADS at hand. PSL bounds are analytically derived and an extensive numerical validation is provided to assess the reliability, the computational efficiency and the effectiveness of the proposed approach. It is worth noticing that, although without any optimisation, such an analytic techniques still able to improve (on average ≃0.3 dB) the performances of GA-optimised layouts. "This paper is a postprint of a paper submitted to and accepted for publication in IET Radar, Sonar & Navigation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library"
Iterative Multi Scaling-Enhanced Inexact Newton-Method for Microwave Imaging
No full textIn the last years, several approaches have been proposed for solving inverse problems arising in microwave imaging [1] and related applications including non‐invasive diagnostics, biomedical imaging, remote sensing, and subsurface prospecting [1]‐[4]. In a microwave imaging problem, the targets are illuminated by incident waves and scattered field samples are measured outside the investigation area [1]‐[4]. In order to retrieve the unknwon objects from the measurements, different stochastic [1][3] and deterministic [2][4] approaches have been proposed
A Mobile Wireless Sensor Network for Collaborative Tasks Achievement by Means Autonomous Robot Robot Swarm
No full textIn the last years, the detection of spatial and temporal variability of heterogeneous parameters is real-time performed [1] thanks to the development of innovative and integrated monitoring system such as Wireless Sensor Network (WSN). Such a technological solution provides an adequate level of pervasiveness mandatory for the observation of complex environmental phenomena in both civilian [2] and military applications as for example dangerous areas surveillance, target tracking, and intrusion detection [3]