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Search Results: 1 - 10 of 6125 matches for " Foresti Gian Luca "
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A Multimodal Learning System for Individuals with Sensorial, Neuropsychological, and Relational Impairments
Sergio Canazza,Gian Luca Foresti
Journal of Sensors , 2013, DOI: 10.1155/2013/564864
Abstract: This paper presents a system for an interactive multimodal environment able (i) to train the listening comprehension in various populations of pupils, both Italian and immigrants, having different disabilities and (ii) to assess speech production and discrimination. The proposed system is the result of a research project focused on pupils with sensorial, neuropsychological, and relational impairments. The project involves innovative technological systems that the users (speech terabits psychologists and preprimary and primary schools teachers) could adopt for training and assessment of language and speech. Because the system is used in a real scenario (the Italian schools are often affected by poor funding for education and teachers without informatics skills), the guidelines adopted are low-cost technology; usability; customizable system; robustness. 1. Introduction Learning systems providing user interaction within physical spaces have been carried out over the years. However the high cost and the high complexity of the technologies used have always implied that their use by pupils in real context was limited to occasional visits or short periods of experimentation. Our aim is to provide an interactive multimodal environment (developed in C++) that can be integrated with the ordinary educational activities within the school. For this purpose, we use common technologies—such as webcams, microphones, and Microsoft Kinect sensors—in order (i) to provide tools that allow teachers to adapt or create autonomously the educational activities content to be carried out with the system and (ii) to implement a user interface for the management software that does not require specific computer skills. Our system implements the five different types of interaction stated by Moreno and Mayer [1]: (1) dialogue, (2) control, (3) manipulation, (4) search, and (5) navigation. Indeed, these five levels are very familiar during the everyday learning activity. Here are some examples: (1) a comparison/oral discussion in which the exchange of information is not unilateral, but the opportunities to the students to ask questions and express their opinions are given influencing the content of the lesson; (2) oral exposure in which the student has the ability to control the speed and to stop the explanation in order to benefit from the educational content at their own pace; (3) a scientific experiment that leaves the possibility for the student to test different parameters and see what happens; (4) the ability to independently seek information on a certain subject within a
Exploiting a Geometrically Sampled Grid in the SRP-PHAT for Localization Improvement and Power Response Sensitivity Analysis
Daniele Salvati,Carlo Drioli,Gian Luca Foresti
Computer Science , 2015,
Abstract: The steered response power phase transform (SRP-PHAT) is a beamformer method very attractive in acoustic localization applications due to its robustness in reverberant environments. This paper presents a spatial grid design procedure, called the geometrically sampled grid (GSG), which aims at computing the spatial grid by taking into account the discrete sampling of time difference of arrival (TDOA) functions and the desired spatial resolution. A new SRP-PHAT localization algorithm based on the GSG method is also introduced. The proposed method exploits the intersections of the discrete hyperboloids representing the TDOA information domain of the sensor array, and projects the whole TDOA information on the space search grid. The GSG method thus allows to design the sampled spatial grid which represents the best search grid for a given sensor array, it allows to perform a sensitivity analysis of the array and to characterize its spatial localization accuracy, and it may assist the system designer in the reconfiguration of the array. Experimental results using both simulated data and real recordings show that the localization accuracy is substantially improved both for high and for low spatial resolution, and that it is closely related to the proposed power response sensitivity measure.
Visual Sensor Technology for Advanced Surveillance Systems: Historical View, Technological Aspects and Research Activities in Italy
Gian Luca Foresti,Christian Micheloni,Claudio Piciarelli,Lauro Snidaro
Sensors , 2009, DOI: 10.3390/s90402252
Abstract: The paper is a survey of the main technological aspects of advanced visual-based surveillance systems. A brief historical view of such systems from the origins to nowadays is given together with a short description of the main research projects in Italy on surveillance applications in the last twenty years. The paper then describes the main characteristics of an advanced visual sensor network that (a) directly processes locally acquired digital data, (b) automatically modifies intrinsic (focus, iris) and extrinsic (pan, tilt, zoom) parameters to increase the quality of acquired data and (c) automatically selects the best subset of sensors in order to monitor a given moving object in the observed environment.
Foresti Gian Luca,Ramponi Giovanni,Regazzoni Carlo,Sicuranza Giovanni L
EURASIP Journal on Advances in Signal Processing , 2004,
Creativity and life cycle: the painting of elderly people Creatività e ciclo di vita: la pittura dell'anziano
Gian Luca Barbieri
PsicoArt : Rivista on line di Arte e Psicologia , 2010,
La scrittura come strumento di attivazione del pensiero ed elaborazione delle emozioni. Gli esempi di “Kaos” e “Lady Tramp”
Gian Luca Barbieri
PsicoArt : Rivista on line di Arte e Psicologia , 2012,
Proyectos de integración regional sudamericana: hacia una teoría de convergencia regional | South American regional integration projects. Towards a theory of regional convergence
Relaciones Internacionales , 2010,
Abstract: Está surgiendo una nueva unidad regional, Sudamérica. En contraposición con Latinoamérica, es un concepto geoestratégico más definible e independiente. Pero, esto hace que la integración regional sea más sencilla? Este artículo adopta una posición escéptica. No es solamente que Sudamérica se caracterice por sus numerosos esquemas de integración regional que compiten entre sí, sino que además los tres más destacados – Mercosur, ALBA y Unasur - presentan respuestas divergentes ante las preguntas fundamentales que han caracterizado históricamente los intentos de regionalismo en América Latina. éstas son: la relación con la potencia líder en el plano internacional, Estados Unidos; el papel que juega el líder regional o paymaster, Brasil; y el modelo económico y de desarrollo que debe ser adoptado. A modo de conclusión, el autor conclusión propone una incipiente teoría de convergencia regional para alcanzar la cohesión regional como estímulo para futuras investigaciones y comprobaciones. A new regional unit - South America - is emerging. This is a more definable and self-contained geostrategic concept as opposed to Latin America. But does this make regional integration any easier? This article adopts a sceptical view. Not only South America is characterised by numerous and competing schemes of regional integration but the three most prominent of them, MERCOSUR, ALBA, and UNASUR offer divergent responses to the fundamental questions that have historically characterised attempts at regionalism in Latin America: The relation towards the international leading power, the United States; the role of the regional leader or paymaster, Brazil; and the economic and development model to be adopted. The conclusion proposes an infant theory of regional convergence to achieve regional cohesion as a suggestion for further research and testing.
In Defense of Oral History: Evidence from the Mercosur Case En defensa de la Historia Oral: Evidencia del caso de Mercosur
Gian Luca Gardini
Journal of Politics in Latin America , 2012,
Abstract: This article makes a case in defense of oral history in the study of political science and international relations. The existing literature has scrutinized the technical aspects and appropriate use of oral material. This article focuses on the circumstances under which oral history may be an indispensable method of scholarly investigation: first, when written primary sources are not readily available; second, when an investigation targets complex and secret high-level negotiations; and third, when the main research concern is the human agent’s perspective and ideational factors. The article first addresses the issue of reliability and rigor of oral history as compared to written sources and then concentrates on the creation of Mercosur as an example of the validity of oral history under the three circumstances identified. The conclusion proposes a revival of a more historical approach to political studies. Este artículo argumenta en favor del uso de la historia oral como método de estudio de las relaciones internacionales y de las ciencias políticas. La literatura académica se ha centrado en las cuestiones más técnicas de las entrevistas y en el uso apropiado de este método. El foco innovador del articulo analiza las circunstancias en que la historia oral puede representar una herramienta indispensable para la investigación académica: primero, cuando las fuentes escritas no están disponibles; segundo, cuando se investigan negociaciones reservadas y complejas de alto nivel; tercero, cuando el interés principal de la investigación es la perspectiva del agente y los factores ideacionales. En primer lugar, el artículo discute la confiabilidad y el rigor de la historia oral en comparación con las fuentes escritas. Luego, el análisis se centra en el caso de estudio de la creación de Mercosur, usado como ejemplo de la validez de la historia oral bajo las tres circunstancias identificadas. La conclusión propone un uso más amplio del enfoque histórico en el estudio de las disciplinas políticas.
Ground-state factorization and quantum phase transition in dimerized spin chains
Gian Luca Giorgi
Physics , 2009, DOI: 10.1103/PhysRevB.79.060405
Abstract: We study the occurrence of ground-state factorization in dimerized $XY$ spin chains in a transverse field. Together with the usual ferromagnetic and antiferromagnetic regimes, a third case emerges, with no analogous in translationally-invariant systems, consisting of an antiferromagnetic Ne\'{e}l-type ground state where pairs of spins represent the unitary cell. Then, we calculate the exact solution of the model and show that the factorizing field represent an accidental degeneracy point of the Hamiltonian. Finally, we extend the study of the existence of ground-state factorization to a more general class of models.
Spontaneous PT symmetry breaking and quantum phase transitions in dimerized spin chains
Gian Luca Giorgi
Physics , 2010, DOI: 10.1103/PhysRevB.82.052404
Abstract: The occurrence of parity-time reversal ($\mathcal{PT}$) symmetry breaking is discussed in a non-Hermitian spin chain. The Hermiticity of the model is broken by the presence of an alternating, imaginary, transverse magnetic field. A full real spectrum, which occurs if and only if all the eigenvectors are $\mathcal{PT}$ symmetric, can appear only in presence of dimerization, i.e. only if the hopping amplitudes between nearest-neighbor spins assume alternate values along the chain. In order to make a connection between such system and the Hermitian world, we study the critical magnetic properties of the model and look for the conditions that would allow to observe the same phase diagram in the absence of the imaginary field. Such procedure amounts to renormalizing the spin-spin coupling amplitudes.
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