On Grid Codes

If $A_{i}$ is finite alphabet for $i=1,...,n$, the Manhattan distance is defined in $\prod_{i=1}^{n}A_{i}$. A grid code is introduced as a subset of $\prod_{i=1}^{n}A_{i}$. Alternative versions of the Hamming and Gilbert-Varshamov bounds are presented for grid codes. If $A_{i}$ is a cyclic group for $i=1,...,n$, some bounds for the minimum Manhattan distance of codes that are cyclic subgroups of $\prod_{i=1}^{n}A_{i}$ are determined in terms of their minimum Hamming and Lee distances. Examples illustrating the main results are provided

Effect of being the organizer of a Handball Worl Championship in team perfomance

Cuando un equipo actúa como local parece tener cierta ventaja. Este hecho se denomina home advantage (HA) y ha sido muy estudiado en competiciones de liga, pero poco en competiciones de sede única. Se analizaron 4.340 partidos disputados en todos los Campeonatos del Mundo de balonmano disputados hasta 2011. Las variables registradas fueron: partidos ganados, empatados, perdidos, número goles marcados y recibidos y sexo de los competidores. La HA en los Campeonatos del Mundo de balonmano es de 67,9±0,23 para la categoría masculina y de 71,2±0,27 para la femenina. Existe una asociación entre la HA, los puntos obtenidos y la clasificación final del equipo.When a team plays at home seems to get some advantage. This effect is called home advantage (HA) and has been widely studied in league competitions, but little in competitions in a single venue. 4.340 games played in all Handballl World Championships since 1936 to 2011 were analyzed. The variables registered were games won, games drawn, games lost, the number of goals scored and goals against and the gender of the competitors. The HA (mean±sd) in the World Handball Championships is 67.9±0.23, for the male category and 71.2±0.27 for the female. A significant association exists between HA, the points obtained in a competition and the final classification of a team

Examples of non-strong fuzzy metrics

Answering a recent question posed by Gregori et al. [On a class of completable fuzzy metric spaces, Fuzzy Sets and Systems 161 (2010), 2193-2205] we present two examples of non-strong fuzzy metrics (in the sense of George and Veeramani). © 2010 Elsevier B.V. All rights reserved.This research was supported by the Ministry of Science and Innovation of Spain under Grants MTM2009-12872-C02-01 and MTM2009-12872-C02-02. J. Gutierrez Garcia also acknowledges financial support from the University of the Basque Country under Grant GIU07/27.Gutiérrez García, J.; Romaguera Bonilla, S. (2011). Examples of non-strong fuzzy metrics. Fuzzy Sets and Systems. 162(1):91-93. https://doi.org/10.1016/j.fss.2010.09.017S9193162

Reforma regulatoria energética en Europa: impacto de los cambios de control corporativo sobre el valor de las empresas

El proceso de desregulación del sector eléctrico en la Unión Europea generó acciones estratégicas de parte de las empresas del sector que han llevado al reordenamiento de su mercado de energía eléctrica. Una serie de fusiones y adquisiciones ocurrieron a raíz de ese proceso. Este trabajo investiga cómo la consecuente ola de fusiones y adquisiciones que se dio en la primera década de este siglo ha afectado el valor en bolsa de las empresas compradoras y adquiridas. Para este propósito, haciendo uso de la metodología de los estudios de acontecimiento y con técnicas econométricas de MCO, GARCH y SURE se encontró que las fusiones y adquisiciones presentaron un efecto positivo estadísticamente significativo sobre el precio de cotización en bolsa para la empresa objeto de compra (u opada), lo cual es consistente con estudios previos.The deregulation process of the European power sector generated strategic moves by the power companies leading to a complete reordering of the European electric market that brought out an upsurge of mergers and acquisitions. This paper researches how the following wave of mergers and acquisitions that took place in the 2000 impacted the market value for the acquiring and selling companies that took part of it. With this objective and making use of the event study methodology, and OLS, GARCH, and SURE econometric techniques, we found that mergers and acquisitions had a positive and significant effect on the average market price in public stock exchanges for the companies that were target which is consistent with previous studies

Rayman: Interoperability use of Meteorological Observation

The observation of atmospheric phenomena enables generating of knowledge about the weather and meteors occurrence in a region. When this information is georeferenced it becomes useful for a great number of professional and public activities in the field of e.g. building, infrastructures, aeronautics, biota, tourism, agriculture and energy. At the present time access to that information is limited. Few meteorological agencies apply geo-Standards, hindering the development of GIS tools for monitoring, threshold alerts and decision support helping. This work describes how public agencies publish meteorological data and the solution developed at the Spanish Electrical Network (REE) to store the information provided by the Spanish Meteorological Agency (AEMET). The implemented solution enables the access to the weather observations collected by the meteorological agency and the rays captured by the detection network in a interoperable way and the exploitation, by as well a desktop GIS capable of connecting with Oracle-Spatial database as through the interfaces of the OGC standardized services (WMS, WFS and SOS)

LD Manager and ld tools: new software to operate lagragian drifters

Peer Reviewe

New lagragian drifter for coastal applications

Peer Reviewe

Achievable throughput with Block Diagonalization on OFDM indoor demonstrator

The proceeding at: 21st European Signal Processing Conference (EUSIPCO 2013), took place 2013, September 09-13, in Marrakech, Septiembre 2013.Block Diagonalization (BD) is a linear precoding transmission technique able to achieve full multiplexing gain in multiple antenna systems. In this work we present a Multiple-Input Multiple-Output (MIMO) implementation based on Orthogonal Frequency Division Multiplexing (OFDM) made up of a transmitter with 4 antennas and 2 users equipped with 2 antennas each one, which allows us to evaluate the performance of BD in indoor scenarios. First, the theoretic achievable rates are obtained for the measured channel in an offline evaluation. After that, the bit error rate performance is evaluated regarding the system sum throughput. To the best of our knowledge, this is the first time that BD performance is validated using a multiuser MIMO testbed.This work has been partially funded by research projects COMONSENS (CSD2008-000 1 0), and GRE3N (TEC20 11-29006-C03-02).Publicad

Una aproximación práctica para el diseño de un proceso de reciclado de polímeros mediante disolución

La cantidad de residuos plásticos producidos en los últimos años se ha visto incrementada debido a la variedad de usos y las buenas propiedades que estos presentan. Por este motivo, es necesario ofrecer soluciones que permitan un reciclaje adecuado a cada tipo de residuo, siguiendo con las normativas vigentes. Entre las alternativas desarrolladas se encuentran el reciclado mecánico, químico y la incineración, sin embargo, estos metodos cuentan con determinados inconvenientes que dificultan su aplicación. Para solventar estos, se propone el tratamiento de los residuos mediante disolución, lo que implica la seleccion adecuada del mejor disolvente, con el objetivo de tratar la máxima cantidad de plástico posible. Esta selección se desarrolla siguiendo una serie de modelos teóricos que permiten el cálculo del parametro de solubilidad (d), y su interpretación a traves de distintos metodos gráficos que permiten seleccionar de manera sencilla los disolventes más adecuados. Por último, tambíen se muestran estrategias de cálculo para conocer las condiciones de operación que vienen definidas por una concentración y temperatura críticas, que limitan la región en la que la disolución permanece estable, y por tanto, es posible realizar el proceso de reciclado