Now showing items 128-147 of 346

    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 ...

    Feature selection for multimodal: acoustic event detection 

    Butko, Taras (Date of defense: 2011-07-08)

    The detection of the Acoustic Events (AEs) naturally produced in a meeting room may help to describe the human and social activity. The automatic description of interactions between humans and environment can be useful for ...

    Feedback of channel state information in multi-antenna systems based on quantization of channel Gram matrices 

    Sacristán Murga, Daniel Francisco (Date of defense: 2012-07-19)

    This dissertation deals with the proper design of efficient feedback strategies for Multiple-Input Multiple-Output (MIMO) communication systems. MIMO systems outperform single antenna systems in terms of achievable throughput ...

    Feedback-Channel and adaptative mimo coded-modulations. 

    Rey Micolau, Francesc (Date of defense: 2006-05-12)

    (Català) En els sistemes de comunicacions on el transmissor disposa de certa informació sobre l'estat del canal (CSI), es possible dissenyar esquemes lineals de precodificació que assignin la potència de manera òptima ...

    Formulación espectral de la radiación: aplicación al caso cilíndrico 

    Romeu Robert, Jordi (Date of defense: 1991-07-08)

    Formulación espectral de la radiación en coordenadas cartesianas, cilíndricas y esféricas. Aplicación de la formulación a problemas de diagnostico de antenas, análisis del efecto de radomos y transformación campo próximo ...

    Fractal antennas 

    Puente Baliarda, Carles (Date of defense: 1997-06-30)

    Las antenas son dispositivos esencialmente de banda estrecha; es decir, su comportamiento es altamente dependiente de la frecuencia de operación. La relación entre la longitud de onda de trabajo y el tamaño de la antena ...

    From hypothesis testing of quantum channels to secret sharing 

    Salek Shishavan, Farzin (Date of defense: 2020-12-14)

    The present thesis has three major thrusts: the first thrust presents a broad investigation of asymptotic binary hypothesis testing, when each hypothesis represents asymptotically many independent instances of a quantum ...

    Fusing prosodic and acoustic information for speaker recognition 

    Farrús Cabeceran, Mireia (Date of defense: 2008-10-29)

    El reconeixement automàtic del locutor és la utilització d’una màquina per identificar un individu a partir de d’un missatge parlat. Recentment, aquesta tecnologia ha experimentat un increment en l’ús de diverses aplicacions ...