A recipe for an unpredictable random number generator

In this work we present a model for computation of random processes in digital computers which solves the problem of periodic sequences and hidden errors produced by correlations. We show that systems with non-invertible non-linearities can produce unpredictable sequences of independent random numbers. We illustrate our result with some numerical calculations related with random walks simulations.Comment: 8 pages, 5 figures, Proceedings Mochima spring school in theoretial physic

Implementaci?n de la l?dica como estrategia metodol?gica de motivaci?n en el proceso de aprendizaje de la multiplicaci?n en los educandos de grado tercero de la Instituci?n Educativa Altozano Sede la Estrella del municipio de Ortega Tolima

57 p. Recurso Electr?nicoEl presente documento corresponde al trabajo de grado desarrollado para obtener el t?tulo de especialista en pedagog?a de la Universidad del Tolima, el cual se ejecut? desde el segundo semestre del 2015 a la actualidad en la sede la Estrella de la instituci?n Educativa ALTOZANO del municipio de Ortega Tolima, el principal objetivo es la implementaci?n de la l?dica como estrategia metodol?gica en el proceso de aprendizaje de la multiplicaci?n de los educandos de b?sica primaria, con el fin de generar una motivaci?n en el proceso de aprendizaje de la multiplicaci?n. Este trabajo se desarroll? bajo un enfoque metodol?gico cualitativo y el tipo de investigaci?n es etnogr?fica, se utiliz? como instrumentos la observaci?n participante, registros fotogr?ficos, registro f?lmico y diario de campo. Los participantes fueron los educandos de la sede la estrella, a quienes por medio de la observaci?n se les pudo identificar una serie de problem?ticas a nivel social y acad?mico que generaban una desmotivaci?n por las matem?ticas y en especial por la multiplicaci?n por ende se determin? utilizar la l?dica para lograr generar una motivaci?n en el aprendizaje de la multiplicaci?n.This document corresponds to the degree work developed to obtain a specialist degree in education from the University of Tolima, which ran from the second half of 2015, to present at the headquarters of Star Educational institution ALTOZANO Township Ortega Tolima, the main objective is the implementation of playful as a methodological strategy in the learning process of multiplication of learners in elementary school, in order to generate a motivation in the learning process of multiplication. This work was developed under a qualitative methodological approach and research is ethnographic, was used as participant observation instruments, photographic records, film recording and field diary. Participants were students from the headquarters of the star, who through observation were able to identify a number of issues to social and academic level that generated a motivation for mathematics and especially multiplication therefore determined using the playful to achieve generate a motivation in learning multiplication. Keywords: Implementation, playful, motivation, learning and multiplicatio

Pedagogía sociocrítica en Paulo Freire y Henry Giroux

El texto consta de cuatro partes fundamentales distribuidas así: La primera presenta el pensamiento de Paulo Freire y sus conceptos centrales, la segunda hace referencia al planteamiento formulado por Henry Giroux y sus características esenciales, la tercera expone una serie de elementos constitutivos del concepto Pedagogía Sociocrítica, uniendo la teoría y la práctica de estos dos autores, finalmente, a modo de conclusión, se hace una valoración personal, dejando elementos que hacen continuar la reflexión sobre los limites de esta experiencia pedagógica

Evolving multidimensional transformations for symbolic regression with M3GP

Muñoz, L., Trujillo, L., Silva, S., Castelli, M., & Vanneschi, L. (2019). Evolving multidimensional transformations for symbolic regression with M3GP. Memetic computing, 11(2), 111–126. https://doi.org/10.1007/s12293-018-0274-5Multidimensional Multiclass Genetic Programming with Multidimensional Populations (M3GP) was originally proposed as a wrapper approach for supervised classification. M3GP searches for transformations of the form k: Rp→ Rd, where p is the number of dimensions of the problem data, and d is the dimensionality of the transformed data, as determined by the search. This work extends M3GP to symbolic regression, building models that are linear in the parameters using the transformed data. The proposal implements a sequential memetic structure with Lamarckian inheritance, combining two local search methods: a greedy pruning algorithm and least squares parameter estimation. Experimental results show that M3GP outperforms several standard and state-of-the-art regression techniques, as well as other GP approaches. Using several synthetic and real-world problems, M3GP outperforms most methods in terms of RMSE and generates more parsimonious models. The performance of M3GP can be explained by the fact that M3GP increases the maximal mutual information in the new feature space.authorsversionpublishe

Magnesio sérico total como factor asociado a preeclampsia

Objetivo: Demostrar si un determinado bajo nivel de magnesio sérico es un factor asociado al desarrollo de pre eclampsia. Material y Métodos: Se llevó a cabo un estudio de tipo analítico, transversal. La muestra de estudio estuvo constituida por 172 pacientes que cumplieron los criterios de selección: 27 pacientes con pre eclampsia y 145 gestantes normales. se usó la prueba Chi Cuadrado y T student en el análisis estadístico. Las relaciones de las variables se consideraron significativas si la posibilidad de equivocarse es menor al 5% (p < 0.05). El estudio se realizó en el Hospital Regional Cayetano Heredia de Piura, Perú en el mes de diciembre el año 2018. Resultados: El magnesio sérico en las mujeres pre eclámpticas fue menor en comparación respecto a las gestantes normales, pero este valor no fue significativo (1,89 0,23 vs 1,91 0,26 respectivamente) (p = 0. 566). Además, el porcentaje de hipomagnesemia en pacientes pre eclámpticas fue de 18.52% y de las gestantes normales fue de 13.79%. Además, identificamos que el porcentaje de primigrávidas en gestantes pre eclámpticas fue de 51.85%, respecto al 23.45% en gestantes normales, (p = 0.003). Conclusión: En nuestro grupo de estudio el nivel de magnesio sérico no es un factor asociado a la presencia de preeclampsia. Así también ser primigrávida es un factor asociado al desarrollo de preeclampsia.Objective: Demonstrate if a certain low level of magnesium is a factor associated with the development of preeclampsia Material and methods: An analytical, cross-sectional study was carried out. The study sample consisted of 172 patients who met the selection criteria: 27 patients with pre-eclampsia and 145 normal pregnant women. the Chi square and T student tests were used in the statistical analysis. The relationships of the variables were considered significant if the possibility of being wrong is less than 5% (p < 0.05). The study was conducted at the Regional Hospital Cayetano Heredia of Piura, Peru in the month of December 2018 Results: Serum magnesium in pre-eclamptic women was lower compared to normal pregnant women, but this value was not significant (1,89 0,23 vs 1,91 0,26 respectively) (p = 0.566) . In addition, the percentage of hypomagnesemia in pre-eclamptic patients was 18.52% and of normal pregnants was 13.79%. In addition, we identified the percentage of primitives in pre-eclamptic pregnant women of 51.85%, compared to 23.45% in normal pregnant women, (p = 0.003). Conclusion: In our study group the magnesium level is not a factor associated with the presence of preeclampsia. Thus, being primiparous is a factor associated with the development of preeclampsia.Tesi

Complicaciones y causas de fallo en cirugía de implante coclear en la población de usuarios del servicio de otorrinolaringología del Hospital Universitario clínica San Rafael

Este estudio corresponde a un análisis descriptivo de los pacientes del Hospital Universitario Clínica San Rafael llevados a cirugía de implante coclear entre Ene/2000 a Dic/2010 y describe la ocurrencia de complicaciones menores y mayores en la cirugía de implante coclear con un mínimo de seguimiento de 12 meses

Systematic revision and phylogeny of the South American sun-spider genus Gaucha Mello-Leitão (Solifugae: Mummuciidae), with description of four new species and two new generic synonymies

The South American sun-spider genus Gaucha Mello-Leitão, 1924 is herein studied from a combined approach of cladistics and traditional taxonomy. This is the first cladistic analysis for a group of mummuciid solifuges, and it is pioneer in integrating traditional morphological characters with landmark data for inferring the phylogeny of any group of Solifugae. As a result, Gaucha is redefined and its monophyly demonstrated. Gaucha fasciata Mello-Leitão, 1924, type species of this formerly monotypic genus, is redescribed based on specimens from the type locality, in Rio Grande do Sul, Brazil. Three new species are described from Brazil: Gaucha avexada sp.nov. from Bahia and Tocantins, Gaucha curupi sp.nov. from Rio Grande do Sul, and Gaucha eremolembra sp.nov. from Minas Gerais. A fourth new species, Gaucha casuhati sp.nov., is described from Buenos Aires province, Argentina. In addition, Metacleobis Roewer, 1934 and Gauchella Mello-Leitão, 1937 are synonymized with Gaucha, following the examination of the type specimens and based upon evidence from the cladistic analysis. Gaucha fulvipes (Roewer, 1934) comb.nov., from Mato Grosso (Brazil), is therefore proposed, whereas Gaucha stoeckeli Roewer, 1934 comb.rest., from Luribay (Bolivia), is restored into its original name combination. Gaucha ibirapemussu (Carvalho et al., 2010) comb.nov. and Gaucha mauryi (Rocha, 2001) comb.nov., from the Brazilian states of Piauí and Bahia, are also transferred, from Mummucia Simon, 1879. Gaucha is here defined, among other characters, by the large size of the cheliceral movable finger MP tooth as compared to MM tooth, and by the presence of a pronounced gnathal edge carina on the movable finger mucron of males. Two species groups are herein defined within the genus: the fasciata group, for G. casuhati sp.nov., G. curupi sp.nov., G. fasciata, G. fulvipes comb. nov. and G. stoeckeli comb.rest., and the ibirapemussu group, for G. avexada sp.nov., G. eremolembra sp.nov., G. ibirapemussu comb. nov. and G. mauryi comb.nov. A key to the identification of Gaucha species is included. Fil: Botero Trujillo, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Ott, Ricardo. Fundacao Zoobotanica Do Rio Grande Do Sul; BrasilFil: Carvalho, Leonardo S.. Universidade Federal Do Piauí; Brasil. Universidade Federal de Minas Gerais; Brasi