Propuesta de un método para cuantificar el comportamiento táctico de los equipos de fútbol

En este trabajo se presentan algunos métodos estadísticos para cuantificar el comportamiento táctico de los equipos de fútbol. Primero se propone un análisis de la efectividad de un equipo, entendiendo ésta por las posibilidades de conseguir gol en función de otras variables que puedan ser influyentes. También se propone un método para medir la calidad ofensiva y defensiva de los equipos, la cual nos permite definir un criterio para la ordenación de los mismos

Central regions for bivariate distributions

For a one-dimensional probability distribution, the classical concept of central region as a real interquantile interval arises in all applied sciences. We can find applications, for instance, with dispersion, skewness and detection of outliers. All authors agree with the main problem in a multivariate generalization: there does not exist a natural ordering in n-dimensions, n > 1. Because of this reason, the great majority of these generalizations depend on their use. We can say that is common to generalize the concept of central region under the definition of the well known concept of spatial median. In our work, we develop an intuitive concept which can be interpreted as level curves for distribution functions and this one provides a trimmed region. Properties referred to dispersion and probability are also studied and some considerations on more than two dimensions are also considered. Furthermore, several estimations for bivariate data based on conditional quantiles are discussed

Professional profile of graduates with a degree in physical activity and sports science in Spain

The new job opportunities that resulted from the growth of the sports industry, due to the impact of sports on society and the increase of sports practice, along with the concern about the influence of such practice on health, have led experts in this field to demand the professionalization of the sector. Thereby, a regulatory development is being carried out, which, although at the regional level, recognises the professions of sports, determining the official academic titles or professional qualifications required for the professional practice and assigning to each profession its corresponding functional scope. Despite the fact that the affiliation rate of the Professional Association of Graduates in Physical Activity and Sports Science does not exceed 15% of the university graduates in Spain, such rate has increased in the last years. As an example, in Andalusia, the number of members has doubled in the last four years. This increase in affiliation may be a reflection of the professionalization process that the sports sector has been experiencing. The aim of this study was to determine the professional profile of graduates with a university degree in Physical Activity and Sports Science. As the main results, there continues to be a higher percentage of men who opt to take these courses, most of them have complementary training/education and there is a high percentage of multiple employment, that is, they combine more than one job, although teaching is still the most popular profession of choice. However, the percentage of graduates who choose teaching as a career is decreasing, which could be due to the diversification of the sector and of the sports professions

A characterization of the multivariate excess wealth ordering

In this paper, some new properties of the upper-corrected orthant of a random vector are proved. The univariate rightspread or excess wealth function, introduced by Fernández-Ponce et al. (1996), is extended to multivariate random vectors, and some properties of this multivariate function are studied. Later, this function was used to define the excess wealth ordering by Shaked and Shanthikumar (1998) and Fernández-Ponce et al. (1998). The multivariate excess wealth function enable us to define a new stochastic comparison which is weaker than the multivariate dispersion orderings. Also, some properties relating the multivariate excess wealth order with stochastic dependence are described

Proceso de decisión basado en la función de esparcimiento

First published in Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas in 93, 4 (1999) published by the Real Academia de Ciencias Exactas, Físicas y Naturales.En este artículo, se estudia un proceso de decisión de exponencialidad basado en la función de esparcimiento para observaciones no censuradas. Existen muchos tests en la literatura estadística cuando la distribución de la hipótesis alternativa en N.B.U.E. y, usando métodos de simulación, comprobamos que es más potente que los clásicos propuestos

Influence of the Surface Viscosity on the Breakup of a Surfactant-Laden Drop

We examine both theoretically and experimentally the breakup of a pendant drop loaded with an insoluble surfactant. The experiments show that a significant amount of surfactant is trapped in the resulting satellite droplet. This result contradicts previous theoretical predictions, where the effects of surface tension variation were limited to solutocapillarity and Marangoni stresses.We solve numerically the hydrodynamic equations, including not only those effects but also those of surface shear and dilatational viscosities. We show that surface viscosities play a critical role to explain the accumulation of surfactant in the satellite droplet.Ministerio de Economía y Competitividad DPI2013-46485-C3-1-R, TRA2013- 45808-RJunta de Extremadura GR1004

Proposta d’un mètode per quantificar la conducta tàctica dels equips de futbol

En aquest treball es presenten alguns mètodes estadístics per quantificar la conducta tàctica dels equips de futbol. Primer, es proposa una anàlisi de l’efectivitat d’un equip, entenent aquesta com les possibilitats d’aconseguir gol en funció d’altres variables que puguin ser influents. També es proposa un mètode per mesurar la qualitat ofensiva i defensiva dels equips, el qual ens permet de definir un criteri per a ordenar-les

A game theoretical randomized method for large-scale systems partitioning

© 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this paper, a game theory-based partitioning algorithm for large-scale systems (LSS) is proposed. More specifically, a game over nodes is introduced in a model predictive control framework. The Shapley value of this game is used to rank the communication links of the control network based on their impact on the overall system performance. A randomized method to estimate the Shapley value of each node and also an efficient redistribution of the resulting value to the links involved are considered to relieve the combinatorial explosion issues related to LSS. Once the partitioning solution is obtained, a sensitivity analysis is proposed to give a measure of its performance. Likewise, a greedy fine tuning procedure is considered to increase the optimality of the partitioning results. The full Barcelona drinking water network (DWN) is analyzed as a real LSS case study showing the effectiveness of the proposed approach in comparison with other partitioning schemes available in the literature.Peer ReviewedPostprint (author's final draft

Potential Use of Annona Genus Plants Leaf Extracts to Produce Bioactive Transdermal Patches by Supercritical Solvent Impregnation

The objective of the present work was to develop a bioactive transdermal patch functionalized with Annona leaf extracts (ALE) by means of supercritical impregnation technique. The potential of six different Annona leaf extracts (ALE) obtained with the enhanced solvent system formed by carbon dioxide + ethanol/acetone was evaluated taking into account the antioxidant activity, total phenol composition and global extraction yields. For the impregnation of ALE, two drug supporting systems were tested: hydrocolloid sodium carboxymethyl cellulose (NaCMC) and polyester dressings (PD). The effect of the impregnation conditions, including pressure (P), temperature (T), percent of co-solvent (ethanol) and ALE/polymer mass ratio, was determined with regard to the loading and the functional activity of the impregnated samples. The optimal impregnation conditions of ALE were established at 55 degrees C and 300 bar which led to obtained transdermal patches with antioxidant and antimicrobial capacity. In order to understand the behavior of the process, the homogeneity of the samples in the vessels was also evaluated. The best results were obtained at higher proportions of co-solvent in the system.The authors would like to thank the research group in "The Institute for Mediterranean and Subtropical Horticulture La Mayora (IHSM)" (CSIC, Malaga, Spain) for providing the raw material and for their support. This research was funded by Junta de Andalucia-FEDER funds 2014-2020, project P18-RT-3272, the Spanish Ministry of Science and Technology, project CTQ2017-86661-R and the European Regional Development Fund(ERDF)

Hamstring extensibility in female elite soccer players

El objetivo de este estudio fue evaluar la extensibilidad de la musculatura isquiosural en futbolistas femeninas de élite. Se realizó un estudio descriptivo transversal en una muestra de 75 jugadoras de élite de fútbol de cuatro categorías: Sub12 (n=20, edad: 11,42 ± 0,90 años), Sub15 (n=21, edad: 13,38 ± 1,50 años), Provincial (amateur) (n=15, edad: 17,13 ± 1,85 años), y Nacional (profesional) (n=20, edad: 22,80 ± 5,25 años). Como instrumentos de medición se utilizaron el test sit and reach (SRT) y el test de flexión profunda (FP) de tronco. Los valores medios presentados en el SRT fueron de 9,74 ± 5,62 cm. para el grupo Sub12, 13,86 ± 4,82 cm. para el grupo Sub15, 9,73 ± 3,58 cm para el grupo Provincial (amateur) y 7,55 ± 8,39 cm para el grupo Nacional (profesional). En el SRT las participantes del grupo Sub15 obtuvieron resultados significativamente superiores que las participantes del grupo Nacional (p<.05), mientras que en la prueba FP el grupo Sub12 obtuvo resultados significativamente superiores que el grupo Nacional (p<.05). En el análisis de correlaciones bivariadas, se observaron correlaciones moderadas entre la altura y los resultados en las pruebas de FP (r=.561; p<.05) y SRT (r=.491; p<.05) en el grupo Sub12. En conclusión, los resultados de este estudio indican que la extensibilidad isquiosural de las jugadoras de élite de fútbol estudiadas es limitada, por lo que deberíamos implementar programas específicos de estiramientos de la musculatura isquiosural en futbolistas féminas desde las categorías inferiores hasta las categorías profesionales. Palabras clave. flexibilidad, fútbol femenino, flexión profunda, sit and reach test.The aim of this study was to evaluate hamstring extensibility in female elite soccer players. A descriptive transversal study was carried out with a sample of 75 female elite soccer players into four categories: Under12 (n=20, age: 11,42 ± 0,90 years), Under15 (n=21, age: 13,38 ± 1,50 years), Provincial (amateur) (n=15, age: 17,13 ± 1,85 years), and National (professional) (n=20, age: 22,80 ± 5,25 years). The sit and reach test (SRT) and the deep trunk flexion test were used as measurement tools. The average values showed in the SRT were 9,74 ± 5,62 cm. for the Under12 group, 13,86 ± 4,82 cm. for the Under15 group, 9,73 ± 3,58 cm for the Provincial (amateur) group and 7,55 ± 8,39 cm for the National (professional) group. In the SRT the members of Under15 group showed significantly higher results than the members of National group (p<.05), while in the deep trunk flexion test the Under12 group showed significantly higher results than the National group (p<.05). In the analysis of bivariate correlations, in the Under12 group moderate correlations were observed between height and scores in the deep trunk test (r = .561; p <.05) and SRT (r = .491; p <.05). In conclusion, the results of this study indicate that the hamstring extensibility in female elite soccer players studied is limited, so we should implement stretching specific programs of the hamstring muscles in female soccer players from the lower categories to the professional categories. Key words. flexibility, female soccer, deep trunk, sit and reach test