Un accidente de trabajo atípico

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Predictions of Clinical Application of the Cardiac Dynamics in Monitoring Patients With Acute Cardiac Syndrome

The physical methodologies of probability and entropy, and Zipf-Mandelbrot law for quantitative evaluation of cardiac dynamics were applied simultaneously, in order to achieve a differentiation between normality and Acute Coronary Syndrome (ACS). A blind study was conducted, taking Holter monitoring tests from 50 normal subjects and 50 people with ACS who developed Acute Myocardial Infarct (AMI) and Cardiogenic Shock (CS). The maximum and minimum heart rate for each hour was taken, and the number of beats at minimum 21 hours. Probability, entropy and proportions of consecutive pairs of heart rates in numerical attractors were calculated. Zipf-Mandelbrot law was applied to cardiac frequencies grouped in ranges of 15 beats/min finding the degree of complexity of each dynamic and establishing its mathematical diagnosis. It was demonstrated that physical methodologies can evaluate more specifically the ACS, AMI and CS, with values of sensitivity and specificity of 100% and Kappa of 1

The Full Strategy Minority Game

The Full Strategy Minority Game (FSMG) is an instance of the Minority Game (MG) which includes a single copy of every potential agent. In this work, we explicitly solve the FSMG thanks to certain symmetries of this game. Furthermore, by considering the MG as a statistical sample of the FSMG, we compute approximated values of the key variable σ 2 /N in the symmetric phase for different versions of the MG. As another application we prove that our results can be easily modified in order to handle certain kinds of initial biased strategy scores, in particular when the bias is introduced at the agents’ level. We also show that the FSMG verifies a strict period two dynamics (i.e., period two dynamics satisfied with probability 1) giving, to the best of our knowledge, the first example of an instance of the MG for which this feature can be analytically proved. Thanks to this property, it is possible to compute in a simple way the probability that a general instance of the MG breaks the period two dynamics for the first time in a given simulation.Fil: Caridi, Délida Inés. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Guala, Sebastian Diego. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Acosta Rodriguez, Gabriel. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Marenco, Javier Leonardo. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentin

Inferencia estadística módulo de regresión lineal simple

La utilización del modelo de regresión lineal en los procesos relacionados con el análisis de datos demanda el conocimiento objetivo e instrumentación de la relación funcional de variables, el coeficiente de determinación y de correlación y la prueba de hipótesis como pilares fundamentales para verificar e interpretar su significancia estadística en el intervalo de confianza determinado. La presentación específica de los temas relacionados con el modelo de regresión lineal, el análisis de regresión, el uso de la ecuación de regresión como instrumento para estimar y predecir y la consideración del análisis de residuales ha sido realizada tomando como referente el estudio de problemas reales definidos en los entornos de la economía, la administración y la salud, utilizando como plataforma de apoyo la hoja de cálculo Excel®

Relationship between force signal and superficial electromyographic signals associated to hand movements

The analysis of electromyographic signals is applied both to the diagnosis of pathologies and to the recognition of movement patterns. Variables such as force and speed of movement are factors that affect the characteristics of the signals of surface electromyography (SMEG). The naturalness of the movements of the hand are also associated with strength and speed. Current work assessment 96 records of SEMG -Force). The objective was to obtain a linear model that would allow the relation of the force signal with the tone of the forearm SEMG signals. The work results show models at the determination coefficient R2 - median 0.78. The SEMG signal would contribute to the variation of the strength signal. However, there are appreciable differences in relation to the model in each type of hand movement

Análisis de modos y efectos de falla para mejorar la disponibilidad operacional en la línea de producción de gaseosas No. 3

Dentro del contenido de este documento se desarrolla una propuesta para mejorar el plan de mantenimiento actual de una de las líneas de producción en la empresa Gaseosas Colombianas Sur, identificando los puntos que afectan la productividad, y cómo se puede implementar un mantenimiento de maquinaria centrado en confiabilidad. Se presenta un marco teórico con el que empieza el desarrollo del proyecto, mostrando los fundamentos teóricos del mantenimiento, además se estudian alternativas y se analiza el tipo de mantenimiento que es factible de implementarse en la empresa.Within the content of this document develops a proposal to improve the current maintenance of the production lines in South Colombian Mineral Company, identifying points that affect productivity, and how to implement a focused machine maintenance reliability. A theoretical framework to begin the project, showing the theoretical foundations of maintenance, and alternatives are studied and the type of maintenance is feasible to be implemented in the company analyzes is presented

Analysis of the thermal sensation in single-family home from microclimatic monitoring: Case study Bucaramanga Colombia

The present work describes the experimentation of monitoring for the finding of the heat index and the individual thermal sensation, where the behavior of the real temperature in the exterior and interior of a conventional single-family house with a warm and temperate climate in Colombia was analyzed. The detailed monitoring campaign is carried out for 2880 hours, where the conditions of the interior area of the house and the local climatic conditions of the area are recorded, through the implementation of a thermohydrometers registration system. The methodology for the calculation of the sensation of heat and thermal comfort was determined under the adjusted equation of cooling power of Leonardo Hill and Morikofer-Davos, applied in the analyses of the Institute of Hydrology, Meteorology and Environmental Studies - IDEAM. The results showed a thermal sensation of dissatisfaction of 97.7%, because with the monitored temperature the thermal sensation is calculated yielding in 1382.4 hours with very hot, 1151.6 hours of hot and 280.8 hours of warm thermal sensation

Identification of energetically critical processes for cocoa production in Santander, Colombia

The intensification of industrial activities in post-harvest cocoa processes has generated a disproportionate increase in energy consumption. The objective of this work is to describe those energetically critical ones that are used in the cocoa production line in Santander so that further research can evaluate the implementation of alternative or renewable energy systems. Through the collection of information and data management, it is seeking to promote the efficient use of energy based on the NTC ISO 500001. For this end, a description of the processes involved in the production of cocoa was made considering the technical data. Then, the energy consumed by the equipment used in the different processes was determined for 30 days, operating 24 hours a day, assuming power factors of 0.75 and 0.9. Finally, through analysis, calculations, and the application of the Pareto methodology, it was possible to identify that the process with the highest energy consumption is the cocoa refining step, since the equipment used in this process consumes more than 30% of energy from the total energy used for cocoa production

Design and construction of a solar tracking system for Linear Fresnel Concentrator

An open circuit solar tracking system has been designed, manufactured, simulated and implemented for a handcrafted prototype of a small scale linear Fresnel reflector with a single axis of motion. The electronic control system is governed by an Arduino UNO R3 board and two main auxiliary systems; a Microstep Driver TB6600 and an RTC DS1302 module. Further, a mechanism was implemented that joins the reflectors to a stepper motor that executes a single movement per sequence, to move the set of reflector mirrors that make up the reflection system of the device. The positioning angles of the reflectors determined by the control algorithm models for solar tracking, allowed to feed the TONATIUH software to evaluate the path of the solar rays through the 3D modeling of the Linear Fresnel reflector on a real scale. The software was designed to follow the path of the sun by means of astronomical equations. In this way, the mirrors of the Linear Fresnel reflector can follow the solar path on a single axis from 7 am to 5 pm, making changes in the position of each element in 15-minute intervals. The percentage of position deviation of the reflectors does not exceed 1% between the location of the full-scale system mirrors and the position angles provided by the control algorithm. The efficiency of the implemented automatic solar tracking system increased by more than 50% compared to the manual tracking system

Edificios nZEB, análisis de la tendencia de investigación

In this paper, the research trend in relation to the NZEB buildings is explored, through the analysis of selected scientific articles published in 11 journals collected in chronological order from 2014 to 2020. The analysis is carried out on the basis and terms of annual investigative publications of the documents in relation to the NZEB, such as contributions made by countries, institutions, authors, and research topics covered. The study carried out uses a document review methodology. The analysis reveals a growing interest in energy efficiency research in recent times, implying that the importance that the construction industry attaches to NZEB in consequences of global warming and accelerating environmental problems. The findings also indicate that, during the period studied, researchers in developed economy areas such as the US and Italy contributed higher rates to promoting research on NZEB. Developing countries like China also went to great lengths to promote research. Research topics covered tend to focus on studies completed with NZEB project delivery and development, building rehabilitation, energy performance, and advanced technologies applied for energy improvement in buildings. This research provides a valuable platform for industry professionals and researchers to understand NZEB construction research trends and developments, including their applicability and their future research and contributions to the topic.En el presente trabajo se exploran la tendencia de investigación con relación a los edificios NZEB, mediante el análisis de artículos científicos seleccionados publicados en 11 revistas recopilados en orden cronológico desde el año 2014 hasta el 2020. El análisis se realiza en base y términos de publicaciones investigativas anuales de los documentos con relación a los NZEB, como contribuciones realizadas por países, instituciones, autores, y temas de investigación cubiertos. El estudio realizado utiliza una metodología de revisión documental. El análisis revela un creciente interés de investigación de rendimiento energético en los últimos tiempos, lo que implica la importancia que la industria de la construcción atribuye a NZEB en consecuencias al calentamiento global y problemática ambiental se está acelerando. Los hallazgos también indican que, durante el período estudiado, los investigadores de las zonas con economías desarrolladas como los EE. UU., e Italia contribuye-ron con índices más altos a promover la investigación sobre NZEB. Los países en desarrollo como China también hicieron grandes esfuerzos para promover la investigación. Los temas de investigación cubiertos tienden a centrarse en los estudios finalizados con la entrega y el desarrollo de proyectos de NZEB, rehabilitación de edificios, rendimiento energético y tecnologías avanzadas que se aplican para el mejoramiento energético en las edificaciones. Esta investigación proporciona una plataforma valiosa para que los profesionales e investigadores de la industria comprendan las tendencias y los desarrollos de investigación de la construcción NZEB, incluida su aplicabilidad, sus futuras investigaciones y contribuciones al tema