Now showing items 180-199 of 345

    Knowledge graph population from news streams 

    Fernández Cañellas, Dèlia (Date of defense: 2023-10-09)

    (English) Media producers publish large amounts of multimedia content online - both text, audio, image and video. As the online media market grows, the management and delivery of contents becomes a challenge. Semantic ...

    Large vocabulary continuous speech recognition for the transcription of Catalan broadcast news and conversations : towards analysis and modelling of acoustic reduction in spontaneous speech 

    Schulz, Henrik (Date of defense: 2017-03-02)

    The transcription of spontaneous speech still poses a challenge to state-of-the-art methods for automatic speech recognition. The present thesis describes the comprehensive development of a large vocabulary continuous ...

    Learning multilingual and multimodal representations with language-specific encoders and decoders for machine translation 

    Escolano Peinado, Carlos (Date of defense: 2022-03-18)

    This thesis aims to study different language-specific approaches for Multilingual Machine Translation without parameter sharing and their properties compared to the current state-of-the-art based on parameter-sharing. We ...

    Learning to extract features for 2D – 3D multimodal registration 

    Pujol Miró, Alba (Date of defense: 2020-09-18)

    The ability to capture depth information form an scene has greatly increased in the recent years. 3D sensors, traditionally high cost and low resolution sensors, are being democratized and 3D scans of indoor and outdoor ...

    Lidar and S-band radar profiling of the atmosphere : adaptive processing for boundary-layer monitoring, optical-parameter error estimation, and application cases 

    Lange Vega, Diego (Date of defense: 2014-07-17)

    This Ph.D. thesis addresses remote sensing of the atmosphere by means of lidar and S-band clear-air weather radar, and related data signal processing. Active remote sensing by means of these instruments offers unprecedented ...

    Lidar remote sensing and co-operative observations: Processing methods and aerosol radiative transfer 

    Barragán Cuesta, Rubén (Date of defense: 2019-07-05)

    This Ph.D. thesis focuses on: (i) the design and integration of a polarimetric channel for the multi-spectral Raman lidar station of the Universitat Politècnica de Catalunya (UPC), Remote Sensing, Antennas, Microwaves and ...

    Lidar sensing of the atmosphere: receiver design and inversion algorithms for an elastic system 

    Rocadenbosch Burillo, Francesc (Date of defense: 1996-12-16)

    LIDAR es un acrónimo de LIght Detection And Ranging. En la presente tesis, se usan técnicas basadas en lidar elástico para monitorizar la atmósfera remotamente y derivar información cuantitativa acerca de sus parámetros ...

    Lifelong AI-driven zero-touch network slicing 

    Rezazadeh, Farhad (Date of defense: 2023-11-13)

    (English) The sixth-generation (6G) network's evolution necessitates advancements in algorithms and architecture to transition from an AI-native to an intrinsic trustworthy automation-native system. Network slicing creates ...

    Link level performance evaluation and link abstraction for LTE/LTE-advanced downlink 

    Serra Pagès, Albert (Date of defense: 2016-02-05)

    Els objectius principals d'aquesta tesis són l'avaluació del rendiment a nivell d'enllaç i l'estudi de l'abstracció de l'enllaç pel LTE/LTE-Advanced DL. S’ha desenvolupat un simulador del nivell d'enllaç E-UTRA DL basat ...

    Machine learning algorithms for 5G optical networks 

    Ibrahim Mohamed Badr, Asmaa (Date of defense: 2023-07-18)

    (English) Throughout this thesis we addressed 5G network challenges. The non-coherent optical modulation tradeoff has been addressed, as we proposed FBMC and artificial intelligence-based schemes. The proposed schemes ...

    Machine learning assisted QoT estimation for optical networks optimization 

    Mahajan, Ankush (Date of defense: 2021-09-28)

    The tremendous increase in data traffic has spurred a rapid evolution of the optical networks for a reliable, affordable, cost effective and scalable network infrastructure. To meet some of these requirements, network ...

    Machine learning techniques for adaptive polynomial and neural network digital predistorters 

    López Bueno, David (Date of defense: 2023-07-07)

    (English) The power amplifier (PA) is a core element in the radio transmitters to support the required mobile and fixed broadband communication link ranges. However, the PA is a power-hungry and nonlinear by nature device. ...

    Marine applications of SAR polarimetry 

    Margarit Martín, Gerard (Date of defense: 2007-07-11)

    Els oceans mantenen una fràgil i complexa cadena que enllaça un alt nombre de factors biològics, sociològics i econòmics. Actualment, aquest ecosistema està amenaçat per l'activitat humana i uns dels punts més crítics és ...

    Matrix completion with prior information in reproducing kernel Hilbert spaces 

    Giménez Febrer, Pere Joan (Date of defense: 2021-02-11)

    In matrix completion, the objective is to recover an unknown matrix from a small subset of observed entries. Most successful methods for recovering the unknown entries are based on the assumption that the unknown full ...

    Media aesthetics based multimedia storytelling. 

    Obrador Espinosa, Pere (Date of defense: 2011-07-08)

    Since the earliest of times, humans have been interested in recording their life experiences, for future reference and for storytelling purposes. This task of recording experiences --i.e., both image and video capture-- ...

    Medida de parámetros de ruido de dispositivos activos basada en fuente adaptada 

    Maya Sánchez, María del Carmen (Date of defense: 2003-12-15)

    En esta Tesis se utiliza una técnica de fuente adaptada para medir los parámetros de ruido de transistores de efecto campo, como MESFET y HEMT. Para ello, se ha implementado un sistema de medida en el margen de frecuencias ...

    Medium-transparent MAC protocols for converged optical wireless networks 

    Kalfas, Georgios (Date of defense: 2017-05-12)

    In order to address the explosive demand for high-capacity and omnipresent wireless access, modern cell-based wireless networks are slowly adopting two major solution roadmaps. The first is the employment of small-cell ...

    Métodos numéricos para aplicaciones biomédicas: problemas directo e inverso electromagnéticos 

    Mallorquí, Jordi J. (Jordi Joan) (Date of defense: 1995-05-02)

    El objetivo básico de la tesis ha sido el desarrollo de algoritmos de reconstrucción que permiten obtener imágenes de cuerpos biológicos de alto contraste. Los datos de entrada de los distintos algoritmos son los campos ...

    Micromachined polymer based components for highly integrated millimeterwave subsystems 

    Jaimes Vera, Edith Aline (Date of defense: 2012-03-16)

    La región de microondas en el espectro electromagnético tiene propiedades únicas que le permiten a las señales propagarse a través de la atmósfera bajo casi cualquier condición climática, ésta es la razón por la cual los ...

    Millimeter wave band reconfigurable circuits (from 30 to above 100 GHz) in BiCMOS-MEMS technology 

    Heredia Vega, Julio César (Date of defense: 2019-09-27)

    Actualment hi ha un ús creixent de dispositius mòbils i de la necessitat d’informació i, per això, cada vegada es necessiten sistemes sense fils amb majors velocitats de dades i més amplada de banda. A més, els sistemes ...