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Jose Luis Garcia Pallero

    Tipo: Otras
    Año: 2017
    Titulo: Currículum vítae
    Editorial: 
    Resumen: 

Currículum vítae en el formato CVN del Ministerio de Economía, Industria y Competitividad


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Alejandra Staller Vázquez

    Tipo: Revistas
    Año: 2016
    Titulo: Interpolation of GPS and Geological Data Using InSAR Deformation Maps: Method and Application to Land Subsidence in the Alto Guadalentín Aquifer (SE Spain).
    Editorial: Remote Sensing, 8(11), 965. DOI:10.3390/rs8110965 JCR-Indexed Q1
    Resumen: Land subsidence resulting from groundwater extractions is a global phenomenon adversely affecting many regions worldwide. Understanding the governing processes and mitigating associated hazards require knowing the spatial distribution of the implicated factors (piezometric levels, lithology, ground deformation), usually only known at discrete locations. Here, we propose a methodology based on the Kriging with External Drift (KED) approach to interpolate sparse point measurements of variables influencing land subsidence using high density InSAR measurements. In our study, located in the Alto Guadalentín basin, SE Spain, these variables are GPS vertical velocities and the thickness of compressible soils. First, we estimate InSAR and GPS rates of subsidence covering the periods 2003–2010 and 2004–2013, respectively. Then, we apply the KED method to the discrete variables. The resulting continuous GPS velocity map shows maximum subsidence rates of 13 cm/year in the center of the basin, in agreement with previous studies. The compressible deposits thickness map is significantly improved. We also test the coherence of Sentinel-1 data in the study region and evaluate the applicability of this methodology with the new satellite, which will improve the monitoring of aquifer-related subsidence and the mapping of variables governing this phenomenon
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Ramón Alcarria Garrido

    Tipo: Revistas
    Año: 2016
    Titulo: Message Fragmentation Assessment in DTN Nanosatellite-based Sensor Networks
    Editorial: Ad Hoc Networks, Elsevier, in press doi:10.1016/j.adhoc.2016.02.015 JCR-Indexed (Q2).
    Resumen: This paper proposes a proactive fragmentation mechanism for an optimal DTN message transfer. DTN message transfer is presented to give coverage to a terrestrial sensor network by using a nanosatellite communications link. Satellite communication is modeled with a multi-access mechanism with priority in downlink traffic (ALOHAGP). This new multiple access protocol is based on unslotted ALOHA extended with an adaptive contention mechanism. It uses satellite feedback to implement the congestion control, and to dynamically adapt the channel effective throughput in an optimal way. The effective throughput has been optimized by adapting the protocol parameters as a function of the current number of active sensors received from satellite. Also, regarding the optimal size of a bundle, there is a lack of standard negotiation methods of bundle sizes that can be accepted by a bundle agent in satellite communications. Thus, too large bundles are dropped and too small messages are inefficient. We have characterized this kind of scenario obtaining a probability distribution for frame arrivals to nanosatellite and visibility time distribution providing an optimal proactive fragmentation of DTN bundles. We have found that the proactive effective throughput (goodput) reaches in some cases almost 97% of the reactive fragmentation approach.
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Alejandra Staller Vázquez

    Tipo: Revistas
    Año: 2016
    Titulo: Present-day crustal deformation along the El Salvador Fault Zone from ZFESNet GPS network.
    Editorial: Tectonophysicis, 670/2016: 66-81. DOI: 10.1016/j.tecto.2015.12.017 JCRQ2
    Resumen: This paper presents the results and conclusions obtained from new GPS data compiled along the El Salvador Fault Zone (ESFZ). We calculated a GPS-derived horizontal velocity field representing the present-day crustal deformation rates in the ESFZ based on the analysis of 30 GPS campaign stations of the ZFESNet network, measured over a 4.5 year period from 2007 to 2012. The velocity field and subsequent strain rate analysis clearly indicate dextral strike–slip tectonics with extensional component throughout the ESFZ. Our results suggest that the boundary between the Salvadoran forearc and Caribbean blocks is a deformation zone which varies along the fault zone. We estimate that the movement between the two blocks is at least ~ 12 mm yr− 1. From west to east, this movement is variably distributed between faults or segments of the ESFZ. We propose a kinematic model with three main blocks; the Western, Central and Eastern blocks delimited by major faults. For the first time, we were able to provide a quantitative measure of the present-day horizontal geodetic slip rate of the main segments of ESFZ, ranging from ~ 2 mm yr− 1 in the east segment to ~ 8 mm yr− 1, in the west and central segments. This study contributes new kinematic and slip rate data that should be used to update and improve the seismic hazard assessments in northern Central America.
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Ramón Alcarria Garrido

    Tipo: Revistas
    Año: 2015
    Titulo: Supporting variability dependencies for rule-based service compositions in prosumer environments
    Editorial: Int. J. of Web and Grid Services, 2015 Vol.11, No.1, pp.57 - 77, JCR-Indexed (IF 2012 = 1.615 Q1)
    Resumen: 

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