Universitat Pompeu Fabra
Now showing items 358-376 of 376
The activity of the brain at rest reveals an intricate functional architecture and yet, the underlying mechanisms generating it are still not well understood. Whole-brain computational models have turned into fundamental ...
This doctoral work focuses on identifying and understanding the intents that motivate a user to perform a search on the Web. To this end, we apply machine learning models that do not require more information than the one ...
This thesis studies parametric optimization in cellular and cell-free networks, exploring data-based and expert-based paradigms. Power allocation and power control, which adjust the transmit power to meet different fairness ...
The main objective of this thesis is to carry out a multidisciplinary study of the behavior of microblog users. To that end we first explore several user behavior patterns employing data mining techniques. Then we use ...
Les connexions de banda ampla estan esdevinguent un servei essencial per a qualsevol llar. Estar connectat a més de 100Mbps, a 1Gbps, o a 10Gbps, és més un problema econòmic que no pas un de tecnològic. Aquesta Tesi té com ...
Spontaneous oscillations in the alpha band (α, 8–12 Hz) reflect ongoing fluctuations in cortical excitability. Several theoretical frameworks and empirical studies have supported the notion that distinct features of ...
In this thesis we tackle two problems which deal with filling-in the information in a region of an image or a video, where the data is either missing or has to be replaced. These problems have applications in the context ...
The investigation of the influence of emotions on human cognition and behavior challenges scientist since a long time. So far the most popular approach to investigate this phenomenon was to observe brain processes and ...
Donat el nivell d'incidència i impacte de l'ictus, hi ha la necessitat de trobar mètodes de rehabilitació més automatitzats que els actuals. Un candidat prometedor és la Realitat Virtual, on múltiples sistemes ja han estat ...
This doctoral thesis focuses on a gap identified in the literature by investigating how visual representations, authoring support, and data analytics can aid teachers in designing for learning in complex scenarios that ...
El gran volumen de datos que las técnicas de minería Web generan sobre espacios Web puede llegar a ser muy difícil de entender, provocando la necesidad de desarrollar nuevas técnicas que permitan generar conocimiento ...
La veu cantada és probablement l'instrument musical més complex i més ric en matisos expressius. Al llarg de varies dècades s'ha dedicat molt d'esforç a investigar i estudiar les seves propietats acústiques i a entendre ...
Stroke represents one of the main causes of adult disability and will be one of the main contributors to the burden of disease in 2030. However, our healthcare systems do not have enough resources to cover the current ...
Ambisonics is a complete theory for spatial audio whose building blocks are the spherical harmonics. Some of the drawbacks of low order Ambisonics, like poor source directivity and small sweet-spot, are directly related ...
In this Thesis we focus on Automatic Facial Behavior Analysis, which attempts to develop autonomous systems able to recognize and understand human facial expressions. Given the amount of information expressed by facial ...
Optimal sequential decision making is a fundamental problem to many diverse fields. In recent years, Reinforcement Learning (RL) methods have experienced unprecedented success, largely enabled by the use of deep learning ...
Word embeddings are a building block of many practical applications across NLP and related disciplines. In this thesis, we present theoretical analysis and algorithms to learn word embeddings. Moreover, we present applications ...
In this thesis, we present some public-key cryptographic schemes. This work is divided in two halves. The rst half deals with zero-knowledge proofs in the classical setting and under falsi able assumptions. In particular, ...
Telecommunication systems such as mobile communications are evolving over time, and thanks to that, many digital services have arisen in the last decade. Usually, these services ask their users to provide sensitive information ...
