Now showing items 244-263 of 345

    Parallel scalability of face detection in heterogeneous multithreaded architectures 

    Oro García, David (Date of defense: 2020-11-17)

    Recently, facial recognition systems have become extremely popular and deployments of this technology are now ubiquitous. Applications ranging from access control to automated surveillance of video feeds rely on facial ...

    Parametric region-based foreround segmentation in planar and multi-view sequences 

    Gallego Vila, Jaime (Date of defense: 2013-10-14)

    Foreground segmentation in video sequences is an important area of the image processing that attracts great interest among the scientist community, since it makes possible the detection of the objects that appear in the ...

    Part-based object retrieval with binary partition trees 

    Giró i Nieto, Xavier (Date of defense: 2012-05-31)

    This thesis addresses the problem of visual object retrieval, where a user formulates a query to an image database by providing one or multiple examples of an object of interest. The presented techniques aim both at finding ...

    Pau-synthetic aperture: a new instrument to test potential improvements for future interferometric radiometers 

    Ramos Pérez, Isaac (Date of defense: 2012-02-27)

    The Soil Moisture and Ocean Salinity (SMOS) mission is an Earth Explorer Opportunity mission from the European Space Agency (ESA). It was a direct response to the global observations of soil moisture and ocean salinity. ...

    Perfomance limits of spatial multiplexing mimo systems 

    García Ordoñez, Luis (Date of defense: 2009-05-06)

    Los canales multiple-input multiple-output (MIMO) proporcionan una forma abstracta y general de modelar un gran número de sistemas de comunicaciones. Los canales MIMO inalámbricos, en concreto, han despertado un gran interés ...

    Phase synchronization scheme for very long baseline coherent arrays 

    Merlano Duncan, Juan Carlos (Date of defense: 2012-07-26)

    Precise phase synchronization of clock or local oscillator signals over distributed systems is a recurring requirement in the design of a wide range of systems, with applications in telecommunications and, for example, in ...

    Photonic devices for next generation fiber-to-the-home access network 

    Chu, Guang Yong (Date of defense: 2016-02-22)

    It would be unaffordable if the WDM-PON technologies were directly applied for massive deployment. Hence, the potential WDM-PON is to be integrated and improved in order to adapt it for NGPON and the future 5G. The UDWDM-PON ...

    Polar coding for the wiretap broadcast channel 

    Olmo Alòs, Jaume del (Date of defense: 2019-10-22)

    In the next era of communications, where heterogeneous, asynchronous and ultra-low latency networks are drawn on the horizon, classical cryptography might be inadequate due to the excessive cost of maintaining a public-key ...

    Polarimetric differential SAR Interferometry with ground-based sensors 

    Pipia, Luca (Date of defense: 2009-09-18)

    Las técnicas de Interferometría Diferencial se basan en la combinación de varias imágenes SAR con distinta separación temporal y permiten la recuperación de las componentes lineales y no-lineales del proceso de deformación ...

    Polarization and index modulations : a theoretical and practical perspective 

    Henarejos Hernández, Pol (Date of defense: 2017-07-19)

    Radiocommunication systems have evolved significantly in recent years in order to meet present and future demands. Historically, time, frequency and more recently, spatial dimensions have been used to improve capacity and ...

    Post-processing methods for ocean monitoring in sar images 

    Tello Alonso, Maria Victoria (Date of defense: 2011-02-07)

    In the recent years, a wide interest has been focused on research and development for the operational use of satellite remote sensing tools for Earth observation. Among different types of sensors, Synthetic Aperture Radars ...

    Privacy-preserving energy management techniques and delay-sensitive transmission strategies for smart grids 

    Tan, Onur (Date of defense: 2016-07-08)

    The smart grid (SG) is the enhancement of the traditional electricity grid that allows bidirectional flow of electricity and information through the integration of advanced monitoring, communication and control technologies. ...

    Procesado y Optimización de Espectros Raman mediante Técnicas de Lógica Difusa: Aplicación a la identificación de Materiales Pictóricos 

    Pérez Pueyo, Rosanna (Date of defense: 2005-01-21)

    La investigación de los materiales constitutivos de obras de arte, en la que se encuadra esta tesis, es una de las aplicaciones de la espectroscopía Raman que ha ido creciendo en importancia en las últimas décadas. El ...

    Programmable DSP-enabled multi-adaptive optical transceivers based on OFDM technology for software defined networks 

    Martín González, Laura (Date of defense: 2019-04-30)

    The dynamic behavior of the traffic demand, due to the advent of technologies such as cloud services or Internet of Things (IoT), is increasing. In fact, heterogeneous connections with different characteristics (bandwidth ...

    Proposal and evaluation of channel assignment algorithms for wireless local area networks with opportunistic spectrum acces capabilities 

    Novillo Parales, Francisco Vicente (Date of defense: 2013-06-04)

    The growing need for wireless connectivity is pushing the massive adoption and usage of Wireless Local Area Networks (WLANs) based on the IEEE 802.11 standard (Wi-Fi), leading to dense deployments of individual, uncoordinated ...

    Proposal of a model for the management of active networks based on policies 

    Vivero Millor, Julio (Date of defense: 2003-12-12)

    Les expectatives dels usuaris en relació a la quantitat i qualitat del serveis de xarxa estan creixent ràpidament. En canvi, desenvolupar e implantar nous serveis de xarxa (serveis que operen a nivell de xarxa) seguint el ...

    Quality evaluation of DInSAR results from the phase statistical analysis 

    Centolanza, Giuseppe (Date of defense: 2015-10-23)

    The Earth is continuously monitored by sensors capable of providing diversified information about several phenomena. In particular Synthetic Aperture Radar (SAR) is able to observe the Earth in all-day and all-weather ...

    Quality of service, security and trustworthiness for network slices 

    Alemany Prats, Pol (Date of defense: 23-03-23)

    (English) The telecommunications' systems are becoming much more intelligent and dynamic due to the expansion of the multiple network types (i.e., wired, wireless, Internet of Things (IoT) and cloud-based networks). Due ...

    Quasi-perfect codes for the classical-quantum channel 

    Blasco Coll, Andreu (Date of defense: 2023-09-27)

    (English) Quantum computers use the laws of quantum mechanics to do complex operations that classical computers can't solve. Quantum computers and other physical quantum systems require quantum information to be completely ...

    Radiation pattern reconfigurable microfabricated planar millimeter-wave antennas 

    Balcells Ventura, Jordi (Date of defense: 2011-05-20)

    Els serveis de telecomunicacions i sistemes radar estan migrant a freqüències mil•limètriques (MMW), on es disposa d 'una major amplada de banda i conseqüentment d'una major velocitat de transmissió de dades. Aquesta ...