Tecnología de información y ventaja competitiva : el caso de los sistemas ERP en Chile

Este trabajo presenta un examen de los factores que anteceden la integración exitosa de una tecnología de información, como son los sistemas ERP (Enterprise Resources Planning), y cuales de estos factores pueden generar una ventaja competitiva sostenible para la empresa. El análisis se basa en un estudio empírico que indagó el fenómeno de implantación exitosa de sistemas ERP en 72 grandes empresas chilenas y lo contrastó con un modelo de investigación propuesto por los autores, utilizando para estos efectos la técnica PLS (Partial Least Square) de modelado de ecuaciones estructurales. Basados en el enfoque conceptual de la teoría de recursos y capacidades, los resultados de la investigación indican que el aprendizaje y la predisposición para el cambio (en conjunción con los otros factores antecedentes del éxito de un sistema ERP y del propio ERP) pueden ser fuentes de una ventaja competitiva sostenible.This paper presents an examination of the factors of successful integration of information technology, such as ERP (Enterprise Resources Planning), and which of these factors can generate a sustainable competitive advantage for the company. The analysis was based on an empirical study that researched the phenomenon of successful implementation of ERP systems in 72 large companies in Chile and contrasted it with a model proposed by the authors, using the technique of structural equation modeling PLS (Partial Least Square). Based on the conceptual approach of resource-based view, research findings indicate that learning and readiness for change (in conjunction with other factors to the success of an ERP system and his own ERP) can be sources a sustainable competitive advantage

Current methods of soccer match analysis

Ha sido realizada una revisión de 86 artículos, con el objetivo de analizar a través de los estudios más recientes los beneficios y limitaciones de los nuevos sistemas para el análisis del futbolista durante el partido, debido a que las mayores exigencias en el rendimiento del fútbol moderno está obligando a replantearse cuáles son sus demandas físicas, así como los modelos de planificación y los métodos de entrenamiento tradicionales. Los resultados muestran que el vídeo análisis asistido por ordenador para la codificación de los patrones de movimiento y la tecnología GPS se presentan como herramientas de gran utilidad para conocer mejor la carga física del jugador, mientras que el diseño observacional facilita la evaluación del comportamiento técnico-táctico del futbolista y el equipo. Como conclusión podemos decir que hemos observado sin embargo una metodología diferente entre las opciones comerciales disponibles y una tecnología ubicada todavía en una etapa inicial de desarrolloA review of 86 references has been made, in order to analyze through the most recent studies the benefits and limitations of the new systems for the analysis of soccer player during the match, due to the fact that the greater performance requirements of modern soccer is forcing to review his physical demands, as well as planning models and traditional training methods. The results show that the computer-aided video analysis for coding movement patterns and the GPS technology are presented as very useful tools for a better understanding of the players physical load, whereas the observational design facilitates assessment of the technical-tactical behavior of the soccer player and the team. In conclusion we can say that we have however observed a different methodology among the available commercial options and a technology still placed at an initial stage of development

DMSO y Acido Ascórbico como terapia de protección en un modelo animal de Isquemia-Reperfusión

El riñón es uno de los órganos que mayor susceptibilidad presenta a la isquemia, numerosas situaciones clínicas involucran mecanismos que afectan la perfusión de dicho órgano. La mortalidad asociada a la FRA se encuentra entre un 10 a 30% de todos los pacientes y continua en la actualidad sin un consenso para su tratamiento. La terapia de dicha condición plantea la eliminación de la causa y la restitución del flujo sanguíneo con lo que se consigue una reentrada del oxigeno al órgano deprivado, esto supone un mayor daño hístico que el ocasionado por el periodo isquémico en donde se han visto involucrados los radicales libre

Experimental characterization of starting jet dynamics

The dynamics of a laminar starting jet are explored in a series of laboratory experiments and numerical simulations. We identify new, objective methods for characterizing the leading vortex ring, enabling robust comparisons with results from a numerical model. Observations of circulation in the initial vortex ring and for the total jet are reported along with strain rate at the leading stagnation point. Growth and pairing of shear instabilities trailing the leading vortex ring is observed. Development of these secondary vortices and their subsequent interactions with the leading vortex has significant effects on the characteristics of the primary vortex ring. Strong fluctuations in strain rate at the leading edge are associated with the pairing of the initial vortex ring with a trailing secondary ringSupport for this research was provided by the Spanish MEC and European Union under Projects # ENE2005-08580-C02-01 and DPI2005-08654-C04-01Publicad

Los estilos educativos de los padres y la competencia psicosocial de los adolescentes

This study examined the relationship between parenting styles and adolescents' psychosocial competence. Parents of 372 students between 11 and 15 years old were classified according to the student perception in four groups: pemissive, authoritative, authoritarian and neglectful. Several aspects related to the students' psychosocial competence were assessed through self-report measures. Results showed that both adolescents perceiving their parents as permissive and adolescents perceiving their parents as authoritative obtained the highest scores in perceived social competence and self-esteem. Moreover, their behavior in the classroom was more positive, and they were less rejected by their  classmates. These jindings are discussed in tems of the dimensions of acceptance and control underlying rhe various parenting styles.Este estudio analiza las relaciones entre los estilos educativos de los padres y algunas variables relacionadas con la competencia psicosocial de los adolescentes. Para ello se clasificó a los padres de 372 estudiantes de 11 a 15 años en cuatro grupos: permisivos, democráticos, autoritariose indiferentes. Los estudiantes cumplimentaron autoinformespara evaluar distintos aspectos relacionados con su competencia psicosocial. Los resultados indican que los adolescentes que consideran a sus padres como permisivos o democráticos obtienen puntuaciones más altas en sus percepciones de competencia social y en autoestima. Sus profesores consideran que su conducta en clase es más positiva, y reciben menos rechazo de sus cornpañeros. Estos resultados se discuten considerando las dimensiones de afecto y control que subyacen a los distintos estilos educativosde los padres

The radial BAO scale and Cosmic Shear, a new observable for Inhomogeneous Cosmologies

As an alternative explanation of the dimming of distant supernovae it has recently been advocated that we live in a special place in the Universe near the centre of a large spherical void described by a Lemaitre-Tolman-Bondi (LTB) metric. In this scenario, the Universe is no longer homogeneous and isotropic, and the apparent late time acceleration is actually a consequence of spatial gradients. We propose in this paper a new observable, the normalized cosmic shear, written in terms of directly observable quantities, and calculable in arbitrary inhomogeneous cosmologies. This will allow future surveys to determine whether we live in a homogeneous universe or not. In this paper we also update our previous observational constraints from geometrical measures of the background cosmology. We include the Union Supernovae data set of 307 Type Ia supernovae, the CMB acoustic scale and the first measurement of the radial baryon acoustic oscillation scale. Even though the new data sets are significantly more constraining, LTB models -- albeit with slightly larger voids -- are still in excellent agreement with observations, at chi^2/d.o.f. = 307.7/(310-4)=1.005. Together with the paper we also publish the updated easyLTB code used for calculating the models and for comparing them to the observations.Comment: 18 pages, 8 figures, the code can be downloaded at http://www.phys.au.dk/~haugboel/software.shtm

Chilaiditi's sign in complicated acute appendicitis: case report and literature review

Chilaiditi's condition refers to the presence of a loop of small intestine or colon between the diaphragm and the hepatic rim, usually due to alterations in the attachment of the liver to the diaphragm. Chilaiditi syndrome is associated with abdominal pain as the most common clinical manifestation. Pneumoperitoneum should always be ruled out in the context of these patients. We presented the case of a male in his eighth decade of life who presented with data suggestive of drug-modified acute appendicitis, for which computed tomography of the abdomen identified acute appendicitis and Chilaiditi's condition. An open appendectomy was performed without complications and the condition resolved

A vision of uses and gratifications applied to the study of Internet use by adolescents

Based on uses and gratifications theory, the aim of this paper is to identify the reasons for using Internet among teenagers and to check different variables in order to predict types of uses. After conducting a representative survey applied to 397 high school students in Community of Madrid (Spain), Internet users’ gratifications and their relationships with variables related to adolescent characteristics, family context and time of online exposure are analyzed. The article concludes that daily use of Internet predicts higher consumption of communication and social relationship

Effects of land vs. Aquatic plyometric training on vertical jump

El objetivo de este estudio fue comparar los efectos de dos programas de entrenamiento pliométrico (inmersión vs. seco) sobre el salto vertical. 65 hombres físicamente activos fueron asignados aleatoriamente a tres grupos: entrenamiento pliométrico acuático (EPA, n 20), entrenamiento pliométrico (EP, n=20) y grupo control (GC, n=25). Los grupos EPA y EP entrenaron 2 sesiones por semana durante 10 semanas, mientras que GC no realizó entrenamiento alguno. El volumen de entrenamiento fue aumentado desde 10 series de 10 repeticiones en la primera semana hasta 10 series de 55 repeticiones en la última. Tanto EPA como EP aumentaron su rendimiento en CMJ y SJ con respecto al pretest (P≤0,001) sin encontrar diferencias significativas entre grupos, mientras que GC no mostró cambios. Como conclusión, el EPA puede ser un método alternativo a EP ya que ambos producen similares mejoras sobre el salto vertical y el estrés mecánico producido por EPA es menoThe aim of this study was to compare the effects of two plyometric training program (aquatic vs. land) on vertical jump. 65 male physical education students took part in this study and were randomly assigned to three groups: aquatic plyometric training group (APT, n = 20), plyometric training group (PT, n = 20) and control group (CG, n = 25). The training program was performed for 10 weeks with a frequency of 2 sessions per week. Volume was increased from 10 sets of 10 repetitions to 10 sets of 55 repetitions. Both APT and PT increased the performance in CMJ and SJ with respect to pretest (P ≤ .001), whereas CG remained unaltered. No statistically significant difference was observed between APT and PT. In conclusion, APT may be an alternative method to PT, because both training protocols have produced similar gains in the vertical jump, but APT might cause lower mechanical stres