Definition of external schemas and derived classes in object oriented databases 

Samos Jiménez, José (Date of defense: 1997-05-14)

El principal objetivo de esta tesis es ampliar el estudio de los esquemas externos en BDOO, en particular, su proceso de definición. Una nueva metodología de definición de esquemas externos que simplifica considerablemente ...

Design and Analysis of Multidimensional Data Structures 

Duch Brown, Amàlia (Date of defense: 2004-12-09)

Aquesta tesi està dedicada al disseny i a l'anàlisi d'estructures de dades multidimensionals, és a dir, estructures de dades que serveixen per emmagatzemar registres $K$-dimensionals que solen representar-se com a punts ...

Determinació d'esquemes d'interacció en models conceptuals orientats a objectes amb interacció implícita 

Quer Bosor, Carme (Date of defense: 1998-10-14)

Digui: a flexibe dialogue system for guiding the user interaction to guiding the user interaction to acces web services 

González Bermúdez, Meritxell (Date of defense: 2010-10-22)

Current dialogue systems can handle friendly and collaborative communication that supports diverse types of interactions, such as menus in which the user is asked to choose an option, form filling in which the user is ...

Dissemination and visualisation of biological data 

Gel Moreno, Bernat (Date of defense: 2014-07-29)

With the recent advent of various waves of technological advances, the amount of biological data being generated has exploded. As a consequence of this data deluge, new challenges have emerged in the field of biological ...

Domain ontology learning from the web 

Sánchez Ruenes, David (Date of defense: 2007-12-14)

El Aprendizaje de Ontologías se define como el conjunto de métodos utilizados para construir, enriquecer o adaptar una ontología existente de forma semiautomática, utilizando fuentes de información heterogéneas. En este ...

Efficient algorithms for the realistic simulation of fluids 

Ojeda Contreras, Jesús (Date of defense: 2013-05-28)

Nowadays there is great demand for realistic simulations in the computer graphics field. Physically-based animations are commonly used, and one of the more complex problems in this field is fluid simulation, more so if ...

El Mètode dels esdeveniments per a l'Actualització de vistes en bases de dades deductives 

Teniente, Ernest (Date of defense: 1992-06-19)

En esta tesis se presenta un nuevo método, llamado método de los eventos, para la actualización de vistas en bases de datos deductivas. Este método aumenta la base de datos con un conjunto de reglas, llamadas reglas de ...

Empirical machine translation and its evaluation 

Giménez Linares, Jesús Ángel (Date of defense: 2008-07-02)

Aquesta tesi estudia l'aplicació de les tecnologies del Processament del Llenguatge Natural disponibles actualment al problema de la Traducció Automàtica basada en Mètodes Empírics i la seva Avaluació.<br/><br/>D'una banda, ...

Enhanced perception in volume visualization 

Díaz Iriberri, José (Date of defense: 2013-04-26)

Due to the nature of scientic data sets, the generation of convenient visualizations may be a difficult task, but crucial to correctly convey the relevant information of the data. When working with complex volume models, ...

Enriching unstructured media content about events to enable semi-automated summaries, compilations, and improved search by leveraging social networks 

Steiner, Thomas (Date of defense: 2014-05-20)

(i) Mobile devices and social networks are omnipresent Mobile devices such as smartphones, tablets, or digital cameras together with social networks enable people to create, share, and consume enormous amounts of media ...

Estimació dels paràmetres de models ARMA (P,Q) mitjançant algorismes de filtratge òptim 

Muñoz Gràcia, Maria Pilar (Date of defense: 1988-01-01)

El objetivo del trabajo era sintetizar un filtro no lineal optimo para la estimación de parámetros de modelos arma. El interés de un filtro de este estilo reside en elhecho que permite evaluar exactamente el numero mínimo ...

Exploiting distributional semantics for content-based and context-aware recommendation 

Codina Busquet, Victor (Date of defense: 2014-06-13)

During the last decade, the use of recommender systems has been increasingly growing to the point that, nowadays, the success of many well-known services depends on these technologies. Recommenders Systems help people to ...

Exploration of customer churn routes using machine learning probabilistic models 

Garcia Gomez, David (Date of defense: 2014-04-10)

The ongoing processes of globalization and deregulation are changing the competitive framework in the majority of economic sectors. The appearance of new competitors and technologies entails a sharp increase in competition ...

Factoid question answering for spoken documents 

Comas Umbert, Pere R. (Date of defense: 2012-05-12)

In this dissertation, we present a factoid question answering system, specifically tailored for Question Answering (QA) on spoken documents. This work explores, for the first time, which techniques can be robustly adapted ...

Fast photorealistic techniques to simulate global illumination in videogames and virtual environments 

Méndez Feliu, Àlex (Date of defense: 2007-06-15)

Per al càlcul de la il·luminació global per a la síntesi d'imatges d'escenaris virtuals s'usen mètodes físicament acurats com a radiositat o el ray-tracing. Aquests mètodes són molt potents i capaços de generar imatges de ...

From the i* diversity to a common interoperability framework 

Cares Gallardo, Carlos (Date of defense: 2012-09-20)

Since the i* framework emerged in the requirements engineering community in the mid-90s, different research groups have proposed variations to the modelling language proposed in the i* framework (¿the i* language¿). There ...

Generative manifold learning for the exploration of partially labeled data 

Cruz Barbosa, Raúl (Date of defense: 2009-10-01)

In many real-world application problems, the availability of data labels for supervised learning is rather limited. Incompletely labeled datasets are common in many of the databases generated in some of the currently most ...

Geometric constraint solving in a dynamic geometry framework. 

Hidalgo García, Marta R. (Date of defense: 2013-12-02)

Geometric constraint solving is a central topic in many fields such as parametric solid modeling, computer-aided design or chemical molecular docking. A geometric constraint problem consists of a set geometric objects on ...

Global illumination techniques for the computation of hight quality images in general environments 

Pérez Cazorla, Frederic (Date of defense: 2003-05-26)

The objective of this thesis is the development of algorithms for the simulation of the light transport in general environments to render high quality still images. To this end, first we have analyzed the existing methods ...