Search results for "Cartography"
showing 10 items of 539 documents
Location-Free Spectrum Cartography
2019
Spectrum cartography constructs maps of metrics such as channel gain or received signal power across a geographic area of interest using spatially distributed sensor measurements. Applications of these maps include network planning, interference coordination, power control, localization, and cognitive radios to name a few. Since existing spectrum cartography techniques require accurate estimates of the sensor locations, their performance is drastically impaired by multipath affecting the positioning pilot signals, as occurs in indoor or dense urban scenarios. To overcome such a limitation, this paper introduces a novel paradigm for spectrum cartography, where estimation of spectral maps rel…
Data-Driven Spectrum Cartography via Deep Completion Autoencoders
2019
Spectrum maps, which provide RF spectrum metrics such as power spectral density for every location in a geographic area, find numerous applications in wireless communications such as interference control, spectrum management, resource allocation, and network planning to name a few. Spectrum cartography techniques construct these maps from a collection of measurements collected by spatially distributed sensors. Due to the nature of the propagation of electromagnetic waves, spectrum maps are complicated functions of the spatial coordinates. For this reason, model-free approaches have been preferred. However, all existing schemes rely on some interpolation algorithm unable to learn from data. …
Spectrum cartography using adaptive radial basis functions: Experimental validation
2017
In this paper, we experimentally validate the functionality of a developed algorithm for spectrum cartography using adaptive Gaussian radial basis functions (RBF). The RBF are strategically centered around representative centroid locations in a machine learning context. We assume no prior knowledge about neither the power spectral densities (PSD) of the transmitters nor their locations. Instead, the received signal power at each location is estimated as a linear combination of different RBFs. The weights of the RBFs, their Gaussian decaying parameters and locations are jointly optimized using expectation maximization with a least squares loss function and a quadratic regularizer. The perfor…
Social Services in the region of Valencia: the current ‘Valencian model’ and a new set of ideas for the construction of a model of social rights
2015
Introducción: La aprobación de la LRSAL* presenta un panorama de cambio para los Sistemas de Servicios Sociales de España, sobre todo en lo atingente a lo local. Un grupo de expertos/as de la Comunitat Valenciana ha trabajado esta circunstancia como una oportunidad positiva. Material y Métodos: Mediante el análisis documental y el debate de la realidad del sector realizado por este grupo de expertos/as, se ha desgranado el modelo actual de los servicios sociales municipales valencianos, se ha reflexionado en sus diferencias con los modelos basados en leyes de tercera generación, y a partir de ello, se atreve a proponer las bases para la construcción de un nuevo modelo del Sistema Valenciano…
Conflictividad social en torno a los azudes del Júcar a finales del siglo XVI. Un problema recurrente por la gestión del agua
2015
[EN] The uses of water resources of the river Júcar have been a recurring element of conflict throughout the history that, at some times, deepened. This is what happened between the late sixteenth century and early seventeenth centuries, coinciding with climatic variations derived from the Little Ice Age. The building of dams, specks and other structures to slow the free flow of the river produced a clash of interests in different aspects such as economic, political or jurisdictional between the different towns of the area of the Ribera del Júcar (Carcaixent versus Alzira, Alzira versus Sueca…) channelled largely through the courts of the kingdom. This paper seeks to analyse these disputes …
Análisis de la realidad sociolingüística del valenciano
2011
Se analiza la situación actual del uso y la percepción social del valenciano entre los habitantes del País Valenciano a partir de los estudios realizados por el Centro de Investigaciones Sociológicas. Para ello, se presta especial atención a variables sociodemográficas a partir de análisis estadístico multivariante con distribuciones de frecuencias bivariadas, análisis de segmentación y regresión logística. El estudio concluye que se produce un estancamiento en el porcentaje de hablantes del valenciano y que las personas de izquierdas y con mayor nivel de estudios son quienes se postulan más a favor de la unidad del valenciano con el catalán. Palabras clave: sociolingüística; diglosia; esta…
Cárcavas y regueros generados en suelos sódicos : Petrer (Alicante, España)
2013
Este articulo pretende mostrar las interacciones entre los procesos de piping y la formacion de carcavas y regueros en diferentes sub-sistemas (laderas y rellenos de fondo de valle) de una pequena cuenca del SE espanol. Se analiza la influencia de diversas propiedades del los suelos y regolitos en el desarrollo de formas asociadas al piping. Los sistemas reguero-tunel de las laderas de badlands estan principalmente relacionados con la ratio de absorcion de sodio (SAR) y la conductividad electrica (CE) de los suelos. En contraste, en los rellenos de fondo de valle estas propiedades quimicas interactuan con las discontinuidades en el gradiente hidraulico introducidas por las terrazas de culti…
Analyse cartographique de données pédologiques et hydrogéologiques appliquée à la gestion responsable de produits phytosanitaires
2014
BASF launched a Responsible Bentazone Management plan in 2011, in order to preserve water resources and sustain its bentazon based herbicide solutions. This molecule is commercialized by the company for several years and is found at concentrations above the standard for drinking water in about 1% of groundwater catchments in France. The action plan aims to reduce contamination situations with recommendations on the use of bentazone (dose, timing of application, restrictions on vulnerable soils on groundwater catchment areas) that complement the commercialization authorization. The study carried out during the internship focused on the diagnosis of a groundwater catchment area located in the…
El español hablado en Valencia. Interferencia lingüística y enseñanza de la lengua
2017
Resumen. Todas las lenguas muestran variación, tanto desde el punto de vista geográfico como social, y su aprendizaje siempre se produce a través de una de sus variedades geográficas. Hay zonas en que el español convive con otras lenguas, y esto le da una serie de características especiales que el profesor de español como lengua extranjera debe conocer y explicar a sus alumnos. En este trabajo, analizamos algunas interferencias lingüísticas que se producen entre español y valenciano, variedad del catalán que se habla en Valencia, y proponemos algunas actividades didácticas para su aprovechamiento en las clases de ELE.Palabras clave. Variación, dialectos, interferencia lingüística, enseñanza…
Modeling Forest Tree Data Using Sequential Spatial Point Processes
2021
AbstractThe spatial structure of a forest stand is typically modeled by spatial point process models. Motivated by aerial forest inventories and forest dynamics in general, we propose a sequential spatial approach for modeling forest data. Such an approach is better justified than a static point process model in describing the long-term dependence among the spatial location of trees in a forest and the locations of detected trees in aerial forest inventories. Tree size can be used as a surrogate for the unknown tree age when determining the order in which trees have emerged or are observed on an aerial image. Sequential spatial point processes differ from spatial point processes in that the…