Adaptive cross-device videoconferencing solution for wireless networks based on QoS monitoring

The increase in CPU power and screen quality of todays smartphones as well as the availability of high bandwidth wireless networks has enabled high quality mobile videoconfer- encing never seen before. However, adapting to the variety of devices and network conditions that come as a result is still not a trivial issue. In this paper, we present a multiple participant videoconferencing service that adapts to different kind of devices and access networks while providing an stable communication. By combining network quality detection and the use of a multipoint control unit for video mixing and transcoding, desktop, tablet and mobile clients can participate seamlessly. We also describe the cost in terms of bandwidth and CPU usage of this approach in a variety of scenarios.

Efecto del cereal base y del programa de alimetnación sobre los parámetros productivos en pollitas de 1 a 17 semanas de edad.

Maíz y trigo son los cereales más utilizados en piensos para aves. El maíz tiene menos proteína (7,7 vs. 11,2%) pero más energía (3.260 vs. 3.150 Kcal EMAn/kg) que el trigo (FEDNA, 2010). Además, el valor nutricional es más variable para el trigo que para el maíz Kim et al., 1976; Mollah et al., 1983). En pollos y en ponedoras, numerosos trabajos indican que el trigo puede ser utilizado en sustitución del maíz como ingrediente principal del pienso Mathlouthi et al., 2002; Carré et al., 2002; Lázaro et al., 2003; Pérez-Bonilla et al., 2011). Frikha et al. (2009), observaron que las pollitas alimentadas con maíz tenían mayores GMD pero IC similares que las pollitas alimentadas con trigo. La presentación del pienso afecta los rendimientos productivos en avicultura. Amerah et al. (2007) mostraron un aumento de la GMD y una mejora del IC en pollos alimentados con gránulos en comparación con los alimentados con harina. Gous y Morris (2001) observaron que pollitas alimentadas con migas de 1 a 4 sem y con gránulo de 5 a 20 sem de edad, consumieron 2% menos pienso pero pesaron un 6% más que las alimentadas con harina durante toda la recría. Frikha et al. (2009) observaron un incremento en la GMD en las pollitas alimentadas con gránulo respecto a las pollitas alimentadas con harina. Los autores no han encontrado información alguna sobre el efecto de alternar la presentación del pienso (bien en harina, bien en miga) durante las distintas etapas del periodo de recría (0-5, 5-10 y 10-17 sem de vida) sobre la productividad de las aves. El presente trabajo estudió la influencia del cereal base del pienso y de cambios en la presentación del mismo durante las 3 fases del programa de alimentación en recría sobre los parámetros productivos en pollitas de 1 a 17 semanas de edad.

Generating reference models for structurally complex data: application to the stabilometry medical domain

We present a framework specially designed to deal with structurally complex data, where all individuals have the same structure, as is the case in many medical domains. A structurally complex individual may be composed of any type of singlevalued or multivalued attributes, including time series, for example. These attributes are structured according to domain-dependent hierarchies. Our aim is to generate reference models of population groups. These models represent the population archetype and are very useful for supporting such important tasks as diagnosis, detecting fraud, analyzing patient evolution, identifying control groups, etc.

Man-pack antenna at X-band

In this paper a low cost man-pack antenna for satellite communications at X band is presented. The antenna has dual circular polarization in Tx and Rx.

GEODA-SARAS: Multi-Phased array planar antenna for satellite communications

Nowadays, earth stations have as a common feature the use of large reflector antenna for downloading data from satellites. Large reflectors have impairments such as mechanical complexity, low flexibility and high cost. Thus, the feasibility of other antenna technologies must be evaluated, such as conformal adaptive antennas based on multiple planar active arrays. In the scenery under study, the capability to track several satellites simultaneously, higher flexibility, lower production and maintenance cost, modularity and a more efficient use of the spectrum; are the most important advantage to boost up active antenna arrays over large dishes.

Broadband access in complex environments: LTE on railway

This paper assesses the main challenges associated with the propagation and channel modeling of broadband radio systems in a complex environment of high speed and metropolitan railways. These challenges comprise practical simulation, modeling interferences, radio planning, test trials and performance evaluation in different railway scenarios using Long Term Evolution (LTE) as test case. This approach requires several steps; the first is the use of a radio propagation simulator based on ray-tracing techniques to accurately predict propagation. Besides the radio propagation simulator, a complete test bed has been constructed to assess LTE performance, channel propagation conditions and interference with other systems in real-world environments by means of standard-compliant LTE transmissions. Such measurement results allowed us to evaluate the propagation and performance of broadband signals and to test the suitability of LTE radio technology for complex railway scenarios.

Measurements and modelling of radio propagation in subway tunnels

The work presented in this article is focused on the RF measurement campaign carried out in several subway tunnels in Metro Madrid (Spain). Most common segments such as straight lines, curves and passing through station as well as other unique scenarios in metropolitan lines were the selected locations during this campaign. Measurements were conducted in tunnels of diverse cross section shapes and taken at three frequency bands: 900 MHz, 2.4GHz and 5.7 GHz for both horizontal and vertical polarization.

Magnetic resonance imaging based signal intensity mapping predicts appropriate therapies after prophylactic ventricular tachycardia substrate ablation in patients with previous myocardial infarction and secondary prevention implantable cardioverter-defibrillator implantation

The aim of this study was to determine the capability of ceMRI based signal intensity (SI) mapping to predict appropriate ICD therapies after PVTSA.

Antena plana Banda Ku en tecnología SIW

This document contains the different parts of a plain antenna which is able to establish a satellite communication. This antenna has been designed in Ku Band. Nowadays this band is specially used by satellite communications and shows numerous advantages, for instance the antennas have small size therefore these antennas are cheaper. The SIW technology is a fundamental part of this project from start to end, because this technology has a lot of applications and leads in this field. Not only have been simulated all the elements of this antenna but also have been built to compare both simulations and measurements.

Radiating element of GEODA-SARAS

This document shows the design of the radiating element of the conformal adaptive antenna of multiple planar arrays GEODA-SARAS. Operating from 2.05 to 2.3 GHz in the S-band with dual circular polarization in Tx and Rx, it is possible to track and communicate with several satellites because of its adaptive beam. The antenna is based on a set of similar triangular arrays which are divided in sub-arrays of five elements called cells.

Diferencias en el sustrato endo y epicárdico de las taquicardias ventriculares posinfarto analizado mediante resonancia magnética cardiaca con realce tardío

Algunas taquicardias ventriculares (TV) posinfarto se localizan en el epicardio. La identificación de diferencias en el sustrato de las TV endocárdicas y epicárdicas permitiría definir una mejor estrategia de ablación.

Utilidad de los mapas de intensidad de señal basados en secuencias de realce tardía 3D para caracterizar el sustrato arritmogénico en pacientes con taquicardía ventricular isquémica

La escara miocárdica constituye el sustrato arritmogénico de los pacientes con TV isquémica. Los mapas de intensidad de señal (IS) obtenidos a partir de mágenes de realce tardío (RT) pueden ser una alternativa no invasiva a los mapas electroanatómicos para estudiar la arquitectura de la escara. El objetivo de este trabajo es describir las características de las escaras observadas en los pacientes (p) con TV isquémicas.

YUCCA8 and YUCCA9 overexpression reveals a link between auxin signaling and lignification through the induction of ethylene biosynthesis.

Auxin is associated with the regulation of virtually every aspect of plant growth and development. Many previous genetic and biochemical studies revealed that, among the proposed routes for the production of auxin, the so-called indole-3-pyruvic acid (IPA) pathway is the main source for indole-3-acetic acid (IAA) in plants. The IPA pathway involves the action of 2 classes of enzymes, tryptophan-pyruvate aminotransferases (TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS 1(TAA1)/TRYPTOPHAN AMINOTRANSFERASE RELATED (TAR)) and flavin monooxygenases (YUCCA). Both enzyme classes appear to be encoded by small gene families in Arabidopsis consisting of 5 and 11 members, respectively. We recently showed that it is possible to induce transcript accumulation of 2 YUCCA genes, YUC8 and YUC9, by methyl jasmonate treatment. Both gene products were demonstrated to contribute to auxin biosynthesis in planta.1 Here we report that the overexpression of YUC8 as well as YUC9 led to strong lignification of plant aerial tissues. Furthermore, new evidence indicates that this abnormally strong secondary growth is linked to increased levels of ethylene production.

Arrecifes de corales de aguas frías como posibles indicadores de emisiones de hidrocarburos en el banco de Galicia y determinación de su edad mediante racemizacion de aminoácidos

Este proyecto tiene como objetivo analizar la posible relación entre los corales de aguas frías encontrados en el Banco de Galicia con los procesos tectónicos y las estructuras relacionadas con la migración y la emisión de fluidos ricos en hidrocarburos (debido a su interés económico), así como la creación de un algoritmo que establezca una relación entre el grado de racemización sufrido por los aminoácidos de las muestras y la edad de estas. Para ello, se han recopilado datos y muestras en el área de estudio, gracias a los cuales se ha creado una base de datos que contiene una clasificación de las muestras recogidas junto a los datos más relevantes de que están relacionados con el objetivo de este trabajo. Estas muestras han sido proporcionadas por el IGME y fueron recogidas mayoritariamente en la campaña oceanográfica DIVA ARTABRIA II. Con estas muestras se han llevado a cabo análisis de laboratorio como el estudio de racemización de aminoácidos, el análisis de biomarcadores y la datación por uranio-torio de los esqueletos aragoníticos de los corales de aguas frías. Para finalizar, se han estudiado dichos datos con el objeto de comprobar la hipótesis de que los corales de aguas frías colonizan zonas con emisiones de hidrocarburos, conocer su edad y en última instancia crear un algoritmo capaz de datar dichos corales a partir del grado de racemización de sus aminoácidos. Palabras clave: corales de aguas frías, Banco de Galicia, campaña oceanográfica, DIVA ARTABRIA II, base de datos, racemización, aminoácidos, biomarcadores, datación uranio-torio, hidrocarburos, algoritmo. ABSTRACT This project studies the relationship between cold-water corals found in the Galicia Bank with tectonic processes and with the structures related to migration and hydrocarbon-rich fluids emissions. Firstly, data and samples in the study were collected, through to classify the collected samples with the most relevant characteristics to our research scope. Sampling and data collection provided by the IGME were collected in the DIVA ARTABRIA II oceanographic cruise. Secondly, the current work presents a systematic laboratory analysis that allowed the study of aminoacid racemization as well as the analysis of biomarkers and the uranium-thorium dating of aragonitic cold-water coral skeletons. Finally, this data was studied to test the hypothesis that cold-water corals colonize areas with emissions of hydrocarbons, know its age and ultimately create and algorithm capable of dating these corals from the degree of racemization in its amino acids. Keywords: cold-water corals, Galicia Bank, oceanographic cruise, DIVA ARTABRIA II, database, racemization, amino acids, biomarkers, uranium-thorium datation, hydrocarbons, algorithm.

Surface tension and microgravity

The behaviour of confined liquids on board an orbiting spacecraft is mainly driven by surface tension phenomena, which cause an apparently anomalous response of the liquid when compared with the behaviour that can be observed on an Earth laboratory provided that the amount of liquid is high enough. The reason is that in an orbiting spacecraft the different inertial forces acting on the bulk of the liquid are almost zero, causing thus capillary forces to be the dominant ones. Of course, since gravity forces are proportional to the liquid volume, whereas surface tension forces are proportional to the liquid surface, there are situations on Earth where capillarity can be the dominant effect, as it happens when very small volume liquid samples are considered. However, work with small size samples may require the use of sophisticated optical devices. Leaving aside the neutral buoyancy technique, a way of handling large liquid interfaces is by using drop towers, where the sample falls subjected to the action of Earth's gravity. This approach is suitable when the characteristic time of the problem under consideration is much smaller than the drop time. In this work the transformation of an out-of-use chimney into a drop tower is presented. Because of the miniaturization, hardiness and low cost of current electronic devices, a drop tower can be used as an inexpensive tool for undergraduate students to experimentally analyse a large variety of surface tension driven phenomena.