Una ingeniería didáctica para contribuir en la comprensión de la noción de límite en el nivel medio superior

El presente escrito muestra los avances de un trabajo de investigación acerca del concepto de límite, es importante señalar que existe una diversidad de investigaciones alrededor de dicho concepto, sin embargo, el problema sobre los procesos de enseñanza aprendizaje sigue siendo tema de preocupación para más de un investigador, debido a que las dificultades siguen estando presentes en la mayoría de los aprendices. En este sentido, nuestro trabajo se centra en atender la escasa comprensión por parte de estudiantes del nivel medio superior de la UAGRO, respecto del concepto de límite y para ello nos hemos planteado proponer actividades que contribuyan a la comprensión del concepto de límite considerando como base de referencia los planes y programas y libro de texto usados en el NMS de la UAGRO. Para ello, nos hemos dado la tarea de buscar, analizar y organizar investigaciones respecto de tres aspectos: epistemológico, didáctico y cognitivo. Con la intención de identificar y usar, algunas propuestas presentadas en las investigaciones

Time Series Heterogeneous Co-execution on CPU+GPU

Time series motif (similarities) and discords discovery is one of the most important and challenging problems nowadays for time series analytics. We use an algorithm called “scrimp” that excels in collecting the relevant information of time series by reducing the computational complexity of the searching. Starting from the sequential algorithm we develop parallel alternatives based on a variety of scheduling policies that target different computing devices in a system that integrates a CPU multicore and an embedded GPU. These policies are named Dynamic -using Intel TBB- and Static -using C++11 threads- when targeting the CPU, and they are compared to a heterogeneous adaptive approach named LogFit -using Intel TBB and OpenCL- when targeting the co-execution on the CPU and GPU.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Aplicación del sistema Raise Climber ascendente para optimizar el avance de construcción de chimeneas en U. M. Orcopampa-Buenaventura 2020

Las operaciones mineras son poco eficientes en labores de preparación de profundización en la mina Buenaventura, por ello, la necesidad de aplicar un nuevo sistema y mejorar los avances de construcción de chimeneas. La mayoría de las empresas optan por realizar dichos trabajos con métodos inadecuados, que han conllevado a poner en riesgo al personal y a no aplicar estándares adecuados para un trabajo seguro. Motivo por el que, en este trabajo de investigación se propone la aplicación del sistema. El objetivo de este estudio es determinar una adecuada aplicación del sistema raise climber descendente para optimizar los avances y sostenimiento de chimeneas. Con este fin, la pregunta de investigación es la siguiente: ¿Cómo será la aplicación del sistema raise climber ascendente para la optimización de operaciones en la construcción de chimeneas en U. M. Orcopampa, Buenaventura, 2020? Con la aplicación del sistema raise climber ascendente se optimizarán los trabajos de chimeneas, mejorando así los avances y el nivel de seguridad en trabajos de chimeneas a partir de un análisis de resultados de rentabilidad después de aplicar el sistema raise climber descendente con los criterios aplicados en este estudio, presentando así los resultados positivos en la optimización de las operaciones

Conflictos en la ciudad turística desde la perspectiva de los movimientos sociales locales

This research addresses the conflicts generated by the recent tourist growth in the tourist city from the perspective of local social movements. First, these processes of growth are reviewed, with a particular focus on excess tourism and the role of tourist housing. Second, it reflects on the conflicts and the social reactions to the perception of negative impacts of tourism in its daily space. Third, the theoretical revision is contrasted and applied to the cities of Malaga and Marbella. The results show that in cities with classic coastal tourism rental housing have existed since their origins as a destination, and now it has become visible because technology platforms have placed it in the global market; meanwhile, in cities with urban-cultural tourism, housing is a new form of accommodation that generates new conflicts. Finally, the results contrast the characteristics of the growth model in the tourist city with the demands of social movements based on reconciling tourism with preserving and improving the quality of everyday life. The three results constitute research opportunities.Esta investigación aborda los conflictos generados por el crecimiento turístico reciente en la ciudad turística desde la perspectiva de los movimientos sociales locales. Para ello primero, se revisan estos procesos de crecimiento, con especial atención a la percepción del exceso de turismo y al papel de las viviendas con fines turísticos. En segundo lugar, se reflexiona sobre los conflictos y las reacciones sociales que responden a la percepción de impactos negativos del turismo en su espacio cotidiano. Se contrasta la revisión teórica de manera aplicada a las ciudades de Málaga y Marbella. Los resultados evidencian que en las ciudades con turismo clásico de litoral ya existía la vivienda de alquiler desde sus orígenes como destino y ahora se ha visibilizado porque las plataformas digitales lo han puesto en el mercado global; en ciudades con turismo urbano-cultural las viviendas son una nueva forma de alojamiento que genera nuevos conflictos; por último, los resultados contrastan las características del modelo crecentista en la ciudad turística frente a las reivindicaciones de los movimientos sociales que cuya base es la compatibilidad del turismo con la preservación y mejora de la calidad de la vida cotidiana. Los tres resultados constituyen oportunidades de investigación.The research in this paper was funded by the project “Overtourism in Spanish coastal destinations. Tourism degrowth strategies An approach from the social dimension” (RTI2018-094844-B-C33) financed by Spanish Ministry of Science, Innovation and Universities (National Plan for RþDþi) the Spanish State Research Agency and the European Regional Development Fund (ERDF)

Histoire comme formateur de citoyenneté: Concepts de lycéens dans un centre à Séville

El objetivo de esta investigación ha sido analizar si los estudiantes son capaces de posicionarse críticamente con respecto a ciertas problemáticas sociopolíticas, si pueden establecer relaciones de causalidad entre fenómenos actuales y acontecimientos pasados y si valoran la utilidad de la Historia en relación al ejercicio de su papel como ciudadanos de una democracia. Participaron en el estudio una muestra de 18 estudiantes de Bachillerato de un centro público de la ciudad de Sevilla (España). Se recabaron datos a partir de una entrevista estructurada, que se analizó con el programa Atlas.ti, utilizando un sistema de categorías en hipótesis de progresión de lo simple a lo complejo. Los resultados ponen de manifiesto que los estudiantes no utilizan el conocimiento histórico para explicar problemáticas de actualidad y posicionarse en torno a ellas. Palabras clave: “Educación ciudadana”; “enseñanza secundaria”; “enseñanza de la Historia”; “educación para los derechos humanos”; “ciudadanía”.The purpose of this research was to analyse whether students are able to express a strong position on some socio-political problems, whether they can find cause-effect relationships between current historical phenomena and past events and whether they appreciate the usefulness of History in connection with their role of citizens in a democracy. A group of 18 A Level students from a state high school of Seville (Spain) took part in this study. Data were collected thanks to a structured interview, whose data were analysed with the Atlas.ti program, using a system of categories with progression hypotheses which move from simple to complex. The results show that students do not use historical knowledge to explain current problems and position themselves around them.L'objectif de cette recherche a été d'analyser si les élèves sont capables de se positionner de manière critique par rapport à certains problèmes sociopolitiques, s'ils peuvent établir des relations de cause à effet entre les phénomènes actuels et les événements passés, et s'ils valorisent l'utilité de l'histoire par rapport à l'exercice de leur rôle de citoyens d'une démocratie. Un échantillon de 18 élèves du secondaire d'une école publique de la ville de Séville (Espagne) a participé à l'étude. Les données ont été collectées à partir d'une interview structurée, qui a été analysée avec le programme Atlas.ti, en utilisant un système de catégories dans l'hypothèse d'une progression du simple au complexe. Les résultats montrent que les élèves n'utilisent pas les connaissances historiques pour expliquer les problèmes actuels et se positionner par rapport à ceux-ci

Solving second-order linear differential equations with random analytic coefficients about ordinary points: A full probabilistic solution by the first probability density function

[EN] This paper deals with the approximate computation of the first probability density function of the solution stochastic process to second-order linear differential equations with random analytic coefficients about ordinary points under very general hypotheses. Our approach is based on considering approximations of the solution stochastic process via truncated power series solution obtained from the random regular power series method together with the so-called Random Variable Transformation technique. The validity of the proposed method is shown through several illustrative examples.This work has been partially supported by the Ministerio de Econom ia y Competitividad grant MTM2013-41765-P. Ana Navarro Quiles acknowledges the doctorate scholarship granted by Programa de Ayudas de Investigacion y Desarrollo (PAID), Universitat Politecnica de Valencia.Cortés, J.; Navarro-Quiles, A.; Romero, J.; Roselló, M. (2018). Solving second-order linear differential equations with random analytic coefficients about ordinary points: A full probabilistic solution by the first probability density function. Applied Mathematics and Computation. 331:33-45. https://doi.org/10.1016/j.amc.2018.02.051S334533

Solving fully randomized higher-order linear control differential equations: Application to study the dynamics of an oscillator

This is the peer reviewed version of the following article: Cortés, J-C, Navarro-Quiles, A, Romero, J-V, Roselló, M-D. Solving fully randomized higher-order linear control differential equations: Application to study the dynamics of an oscillator. Comp and Math Methods. 2021; 3:e1163, which has been published in final form at https://doi.org/10.1002/cmm4.1163. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] In this work, we consider control problems represented by a linear differential equation assuming that all the coefficients are random variables and with an additive control that is a stochastic process. Specifically, we will work with controllable problems in which the initial condition and the final target are random variables. The probability density function of the solution and the control has been calculated. The theoretical results have been applied to study, from a probabilistic standpoint, a damped oscillator.European Social Fund, Grant/Award Numbers: GJIDI/2018/A/009, GJIDI/2018/A/010; Spanish Ministerio de Economía, Industria y Competitividad (MINECO), the Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER UE), Grant/Award Number: MTM2017-89664-P.Cortés, J.; Navarro-Quiles, A.; Romero, J.; Roselló, M. (2021). Solving fully randomized higher-order linear control differential equations: Application to study the dynamics of an oscillator. Computational and Mathematical Methods. 3(6):1-15. https://doi.org/10.1002/cmm4.1163S1153

Some results about randomized binary Markov chains: Theory, computing and applications

[EN] This paper is addressed to give a generalization of the classical Markov methodology allowing the treatment of the entries of the transition matrix and initial condition as random variables instead of deterministic values lying in the interval [0,1]. This permits the computation of the first probability density function (1-PDF) of the solution stochastic process taking advantage of the so-called Random Variable Transformation technique. From the 1-PDF relevant probabilistic information about the evolution of Markov models can be calculated including all one-dimensional statistical moments. We are also interested in determining the computation of distribution of some important quantities related to randomized Markov chains (steady state, hitting times, etc.). All theoretical results are established under general assumptions and they are illustrated by modelling the spread of a technology using real data.This work has been partially supported by the Ministerio de Economía y Competitividad [grant MTM2017-89664-P]. Ana Navarro Quiles acknowledges the doctorate scholarship granted by Programa de Ayudas de Investigación y Desarrollo (PAID), Universitat Politècnica de ValènciaCortés, J.; Navarro-Quiles, A.; Romero, J.; Roselló, M. (2020). Some results about randomized binary Markov chains: Theory, computing and applications. International Journal of Computer Mathematics. 97(1-2):141-156. https://doi.org/10.1080/00207160.2018.1440290S141156971-

Probabilistic analysis of random nonlinear oscillators subject to small perturbations via probability density functions: Theory and computing

[EN] We study a class of single-degree-of-freedom oscillators whose restoring function is affected by small nonlinearities and excited by stationary Gaussian stochastic processes. We obtain, via the stochastic perturbation technique, approximations of the main statistics of the steady state, which is a random variable, including the first moments, and the correlation and power spectral functions. Additionally, we combine this key information with the principle of maximum entropy to construct approximations of the probability density function of the steady state. We include two numerical examples where the advantages and limitations of the stochastic perturbation method are discussed with regard to certain general properties that must be preservedThis work has been supported by the Spanish Ministerio de Economia, Industria y Competitividad (MINECO), the Agencia Estatal de Investigacion (AEI), and Fondo Europeo de Desarrollo Regional (FEDER UE) Grant PID2020-115270GB-I00. The authors express their deepest thanks and respect to the reviewers for their valuable commentsCortés, J.; López-Navarro, E.; Romero, J.; Roselló, M. (2021). Probabilistic analysis of random nonlinear oscillators subject to small perturbations via probability density functions: Theory and computing. European Physical Journal Plus. 136(7):1-23. https://doi.org/10.1140/epjp/s13360-021-01672-wS1231367W.L. Oberkampf, S.M. De Land, B.M. Rutherford, K.V. Diegert, K.F. Alvin, Error and uncertainty in modeling and simulation. Reliab. Eng. Syst. Saf. 75, 333–357 (2002)T. Soong, Random Differential Equations in Science and Engineering, vol. 103 (Academic Press, New York, 1973)Kloeden, P., Platen, E.: Numerical Solution of Stochastic Differential Equations, Ser. Stochastic Modelling and Applied Probability, vol. 23. Springer, Berlin Heidelberg (1992)J.L. Bogdanoff, J.E. Goldberg, M. Bernard, Response of a simple structure to a random earthquake-type disturbance. Bull. Seismol. Soc. Am. 51, 293–310 (1961)L. Su, G. Ahmadi, Earthquake response of linear continuous structures by the method of evolutionary spectra. Eng. Struct. 10, 47–56 (1988)X. Jin, Y. Tian, Y. Wang, Z. Huang, Explicit expression of stationary response probability density for nonlinear stochastic systems. Acta Mech. 232, 2101–2114 (2021)D. Lobo, T. Ritto, D. Castello, E. Cataldo, Dynamics of a Duffing oscillator with the stiffness modeled as a stochastic process. Int. J. Non-Linear Mech. 116, 273–280 (2019)Y. Lin, G. Cai, Probabilistic Structural Dynamics: Advanced Theory and Applications (McGraw-Hill, Cambridge, 1995)C. To, Nonlinear Random Vibration: Analytical Techniques and Applications (Swets & Zeitlinger, New York, 2000)M. Kaminski, The Stochastic Perturbation Method for Computational Mechanics (Wiley, New York, 2013)J.J. Stoker, Nonlinear Vibrations (Wiley (Interscience), New York, 1950)N. McLachlan, Laplace Transforms and Their Applications to Differential Equations, vol. 103 (Dover Publ. INc., New York, 2014)R.F. Steidel, An Introduction to Mechanical Vibrations (Wiley, New York, 1989)G. Casella, R. Berger, Statistical Inference (Cengage Learning, New Delhi, 2007)H.V. Storch, F.W. Zwiers, Statistical Analysis in Climate Research (Cambridge University Press, Cambridge, 2001)J.V. Michalowicz, J.M. Nichols, F. Bucholtz, Handbook of Differential Entropy (CRC Press, Boca Raton, 2018)H. Banks, H. Shuhua, W. Clayton Thompson, Modelling and Inverse Problems in the Presence of Uncertainty (Ser. Monographs and Research Notes in Mathematics. CRC Press, Boca Raton, 2001)Garg, V.K., Wang, Y.-C.: 1 - signal types, properties, and processes. In: Chen, W.-K. (ed.) The Electrical Engineering Handboo