Now showing items 121-140 of 345

    Earth remote sensing with SMOS, Aquarius and SMAP missions 

    Pablos Hernández, Miriam (Date of defense: 2016-10-03)

    The first three of a series of new generation satellites operating at L-band microwave frequencies have been launch in the last decade. L-band is particularly sensitive to the presence of water content in the scene under ...

    Efectos de la turbulencia atmosférica en la propagación de ondas electromagnéticas 

    Belmonte Molina, Aniceto (Date of defense: 1995-05-04)

    El trabajo se divide en tres partes: 1) estudio sintético de las técnicas de calculo de los efectos de las fluctuaciones aleatorias del índice de refracción inducidas por la turbulencia atmosférica en la propagación de ...

    Efficient, end-to-end and self-supervised methods for speech processing and generation 

    Pascual De La Puente, Santiago (Date of defense: 2020-01-31)

    Deep learning has affected the speech processing and generation fields in many directions. First, end-to-end architectures allow the direct injection and synthesis of waveform samples. Secondly, the exploration of efficient ...

    Electromagnetic propagation in tunnels 

    Izquierdo Fernández, Benjamín (Date of defense: 2011-09-22)

    Introduction of wireless communications systems in railway communications are at the origin of this thesis. Ifercat, the company in charge of the development of Línia 9 of Barcelona Metro, decided that wireless systems ...

    Empirical Determination of the Sea Surface Emissivity at L-band: A contribution to ESA's SMOS Earth Explorer Mission 

    Villarino Villarino, Ramón María (Date of defense: 2004-09-08)

    El estudio de la medida de la salinidad del océano junto con la humedad del terreno constituyen dos de las aplicaciones más importantes dentro del mundo de la teledetección que no han sido estudiadas hasta la fecha. ...

    Energy and cost management in shared heterogeneous network deployments 

    Oikonomakou, Maria (Date of defense: 2019-04-10)

    During the recent years, a huge augmentation of the data traffic volume has been noticed, while a further steep increase is expected in the following years. As a result, questions have been raised over the years about the ...

    Energy efficient offloading techniques for heterogeneous networks 

    Miliotis, Vasileios (Date of defense: 2016-03-11)

    Mobile data offloading has been proposed as a solution for the network congestion problem that is continuously aggravating due to the increase in mobile data demand. The concept of offloading refers to the exploitation of ...

    Energy-aware service provisioning in P2P-assisted cloud ecosystems 

    Sharifi, Leila (Date of defense: 2016-11-23)

    Energy has been emerged as a first-class computing resource in modern systems. The trend has primarily led to the strong focus on reducing the energy consumption of data centers, coupled with the growing awareness of the ...

    Energy-driven techniques for massive machine-type communications 

    Liesegang Maria, Sergi (Date of defense: 2022-11-07)

    In the last few years, a lot of effort has been put into the development of the fifth generation of cellular networks (5G). Given the vast heterogeneity of devices coexisting in these networks, new approaches have been ...

    Energy-efficient wireless communication schemes and real-time middleware for machine-to-machine networks 

    Predojev, Tatiana (Date of defense: 2014-10-06)

    Esta tesis estudia sistemas Machine-to-Machine (M2M) en los que se ejecutan tareas de manera autónoma sin, o con mínima intervención humana. Los sistemas M2M están formados por dispositivos desplegados en un entorno que ...

    Entrenamiento Disciminativo de Modelos Ocultos de Markov de Unidad Subléxica para su Aplicación a Sistemas de Reconocimiento Automático del Habla Continua 

    Nogueiras Rodríguez, Albino (Date of defense: 1999-11-22)

    En esta tesis se aborda el entrenamiento discriminativo de unidades subléxicas utilizando bases de datos de propósito geneal. Las unidades subléxicas son la base de funcionamiento de los sistemas de reconocimiento de grandes ...

    Estimation and control in energy harvesting wireless communication networks 

    Calvo Fullana, Miguel (Date of defense: 2017-07-25)

    Long thought to be an unattainable ambition, self-sustainable and green-powered wireless networks are rapidly becoming a reality. This is driven by recent hardware improvements in what is known as Energy Harvesting (EH). ...

    Estudi, anàlisi, disseny i implementació de tècniques de reconeixement d'espectres Raman. Aplicació a la identificació de materials pictòrics. 

    Castanys Tutzó, Mireia (Date of defense: 2009-04-24)

    L'espectroscòpia Raman és una tècnica fotònica molt emprada per l'anàlisi i la caracterització de materials. Entre les seves aplicacions destaca el seu ús en l'estudi del patrimoni cultural, on s'aplica per exemple en ...

    Evaluation of the surface impedance of ReBCO coated conductors and requirements for their use as beam screen materials for the FCC-hh 

    Krkotic, Patrick (Date of defense: 2022-11-25)

    (English) The Future Circular Hadron Collider (FCC-hh) is a proposal for a 100-kilometre-long particle accelerator with collision energy substantially higher than previous colliders to expand the Large Hadron Collider (LHC) ...

    Experimental estimation of soil emissivity and its application to soil moisture retrieval in the SMOS Mission 

    Monerris Belda, Alessandra (Date of defense: 2009-09-07)

    Tot i que l'aigua retinguda pel sòl constitueix una petita fracció del volum total d'aigua que hi ha a la Terra, l'humitat del sòl juga un paper important als models climàtics i hídrics. La radiometria en banda L (1.400 a ...

    Exploiting cognition for energy and spectrum efficient wireless networks 

    Mesodiakaki, Agapi (Date of defense: 2015-11-09)

    The main objective of this thesis is to propose and evaluate medium access layer algorithms, that will exploit different types of cognition to provide energy and spectrum efficiency enhancement. In particular, two main ...

    Exploiting spatial modulation and analog network coding for the design of energy-efficient wireless networks 

    Ntontin, Konstantinos (Date of defense: 2015-11-03)

    As the data rate demands of the cellular users increase, together with their number, it is expected that unprecedented capacity demands should be met in wireless networks in the forthcoming years. However, the energy ...

    Exponentiated weibull fading channel model in free-space optical communications under atmospheric turbulence 

    Barrios Porras, Ricardo (Date of defense: 2013-05-17)

    Free-space optical (FSO) communications is drawing increasing attention as a promising technology to overcome bandwidth shortage, of an evermore crowded wireless marketplace. Currently radio-frequency (RF) technology ...

    Face recognition by means of advanced contributions in machine learning 

    Espinosa Duró, Virginia (Date of defense: 2013-06-14)

    Face recognition (FR) has been extensively studied, due to both scientific fundamental challenges and current and potential applications where human identification is needed. FR systems have the benefits of their non ...

    Fairness Analysis of Wireless Beamforming Schedulers 

    Bartolomé Calvo, Diego (Date of defense: 2005-01-12)

    Aquesta tesi es dedica a l'anàlisi de la justícia a la capa física en entorns de comunicacions amb múltiples antenes i diversos usuaris, cosa que implica un nou punt de vista sobre problemas tradicionals. Malgrat això, el ...