1,317 research outputs found

    El futuro de los MOOC: ¬Ņaprendizaje adaptado o modelo de negocio?

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    En l‚Äôactualitat, molts cursos MOOC es dissenyen com si fossin una col¬∑lecci√≥ de v√≠deos als quals s‚Äôafegeix un f√≤rum, fet que implica seguir un model d‚Äôensenyament a dist√†ncia tradicional sense promoure un aprenentatge adaptat o personalitzat. Aspectes com aquests, juntament amb la qualitat del proc√©s formatiu, han de constituir un dels principals reptes dels MOOC en els propers anys.Aquest tipus de cursos poden desenvolupar un important paper formatiu en l‚Äôeducaci√≥ superior, no nom√©s en pa√Įsos on ja s‚Äôestigui oferint aquest tipus de formaci√≥ sin√≥ en pa√Įsos en vies de desenvolupament. Per fer-ho possible, els MOOC han d‚Äôadoptar diferents estrat√®gies d‚Äôensenyament per promoure un aprenentatge m√©s personalitzat que comporti tamb√© algun tipus de certificaci√≥ i acreditaci√≥ dels ensenyaments.El futur dels MOOC ha de passar per afrontar cinc dimensions priorit√†ries: el model pedag√≤gic, els processos de monetitzaci√≥, la certificaci√≥, l‚Äôaprenentatge adaptat i els MOOC en pa√Įsos en vies de desenvolupament.Currently, many MOOCs are designed as a collection of videos with a forum using some traditional distance learning models, but they do not promote adaptive and personalized learning. These features, together with the quality of the training process, must be the main challenges for the coming years.These types of courses can have a formative role in higher education, not only in countries where MOOCs are already offered but also in less economically developed countries. To make this possible MOOCs must adopt different teaching strategies to promote personalized learning and offer some form of accreditation and certification.The future of MOOCs can be understood if we approach it from five dimensions: the teaching model, monetization, certification, adaptive learning and MOOCs for developing countries.En la actualidad, muchos cursos MOOC se dise√Īan como si fueran una colecci√≥n de v√≠deos a los que se a√Īade un foro, lo que implica seguir un modelo de ense√Īanza a distancia tradicional sin promover un aprendizaje adaptado o personalizado. Aspectos como estos, junto con la calidad del proceso formativo, deben constituir uno de los principales retos de los MOOC en los pr√≥ximos a√Īos.Este tipo de cursos pueden desempe√Īar un importante papel formativo en la educaci√≥n superior, no solo en pa√≠ses donde ya se est√° ofreciendo este tipo de formaci√≥n sino en pa√≠ses en v√≠as de desarrollo. Para hacerlo posible, los MOOC deben adoptar diferentes estrategias de ense√Īanza para promover un aprendizaje m√°s personalizado que conlleve tambi√©n alg√ļn tipo de certificaci√≥n y acreditaci√≥n de las ense√Īanzas.El futuro de los MOOC debe pasar por afrontar cinco dimensiones prioritarias: el modelo pedag√≥gico, los procesos de monetizaci√≥n, la certificaci√≥n, el aprendizaje adaptado y los MOOC en pa√≠ses en v√≠as de desarrollo

    Recovery capital pathways : modelling the components of recovery wellbeing.

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    In recent years, there has been recognition that recovery is a journey that involves the growth of recovery capital. Thus, recovery capital has become a commonly used term in addiction treatment and research yet its operationalization and measurement has been limited. Due to these limitations, there is little understanding of long-term recovery pathways and their clinical application. We used the data of 546 participants from eight different recovery residences spread across Florida, USA. We calculated internal consistency for recovery capital and wellbeing, then assessed their factor structure via confirmatory factor analysis. The relationships between time, recovery barriers and strengths, wellbeing and recovery capital, as well as the moderating effect of gender, were estimated using structural equations modelling. The proposed model obtained an acceptable fit (Ōá(2) (141, N=546)=533.642, p<0.001; CMIN/DF=3.785; CFI=0.915; TLI=0.896; RMSEA=0.071). Findings indicate a pathway to recovery capital that involves greater time in residence ('retention'), linked to an increase in meaningful activities and a reduction in barriers to recovery and unmet needs that, in turn, promote recovery capital and positive wellbeing. Gender differences were observed. We tested the pathways to recovery for residents in the recovery housing population. Our results have implications not only for retention as a predictor of sustained recovery and wellbeing but also for the importance of meaningful activities in promoting recovery capital and wellbeing. [Abstract copyright: Copyright ¬© 2017 Elsevier B.V. All rights reserved.

    Estudio multivariado para determinar la relación entre actividad física, condición física y rendimiento académico

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    [Abstract]The relationship between physical activity, physical fitness, and academic performance has been widely studied internationally. However, reports of this relationship are contradictory, and its impact is still a matter of controversy. For that reason, the current research determined the correlation between these three variables in a group of 56 female and 48 male Colombian students with an average age of 14.08 ¬Ī 0.89 years. A quantitative, correlational, and cross- sectional study was carried out. The physical activity was evaluated using PAQ-A questionnaire. For physical fitness, six tests from the Euro fitness battery were used. The academic performance in Spanish, Math, Natural, and Social Sciences were obtained from the grades for the participants at the end of the academic year. Correlations were determined by multivariate multiple linear regression. The obtained results suggest that aerobic endurance test had effect in the studied variables, whereas the correlation of the other tested predictors did not show any meaningful statistical result. In fact, academic performance is not affected by the physical fitness of the students at the time course grades were measured.[Resumen] La relaci√≥n entre la actividad f√≠sica, la condici√≥n f√≠sica y el rendimiento acad√©mico ha sido ampliamente estudiada a nivel internacional. Sin embargo, los reportes de esta relaci√≥n son contradictorios y su impacto a√ļn es motivo de controversia. Por ello, la presente investigaci√≥n determin√≥ la correlaci√≥n entre estas tres variables en un grupo de estudiantes colombianos de los cuales 56 eran de g√©nero femenino y 48 masculino, con edad promedio de 14,08 ¬Ī 0,89 a√Īos. Se realiz√≥ un estudio cuantitativo, correlacional y transversal. La actividad f√≠sica se evalu√≥ mediante el cuestionario PAQ-A. Para la aptitud f√≠sica, se utilizaron seis pruebas de la bater√≠a de test Eurofit. El rendimiento acad√©mico en Espa√Īol, Matem√°ticas, Ciencias Naturales y Sociales se obtuvo a partir de las notas de los participantes al final del curso acad√©mico. Las correlaciones se determinaron mediante una regresi√≥n lineal m√ļltiple multivariante. Los resultados obtenidos sugieren que la prueba de resistencia aer√≥bica tuvo efecto en las variables estudiadas, mientras que la correlaci√≥n de los otros predictores probados no mostr√≥ ning√ļn resultado estad√≠stico significativo. De hecho, el rendimiento acad√©mico no es afectado por la condici√≥n f√≠sica de los estudiantes durante el tiempo en el que fueron evaluados

    Optimal Sectioning of Hydrocarbon Transport Pipeline by Volume Minimization, and Environmental and Social Vulnerability Assessment

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    PresentationSectioning is one of the key mitigation strategies in pipeline transport of liquid hydrocarbons. The valves located along pipelines reduce the maximum volume that may be spilled, decreasing economic, social and environmental losses. Defining the location and number of valves in a specific pipeline section is a challenge due to the countless combinations of these two design components (i.e., where and how many valves). In this work, we tackle the valve location problem (VLP) for sectioning. To solve the problem, we use an optimization approach which assesses the number and location of valves to minimize environmental and social consequences. This problem is modeled as a shortest path problem and it considers the maximum volume that could be spilled as well as environmental and social issues. To estimate and quantify the damages (environmental and social) a new framework is proposed. We present a case study for sectioning in a pipeline of Colombia; the problem is solved using a Bellman-Ford algorithm with CPU times up to 32 s. The results show reductions around 75% of the maximum possible spilled volume. The resulting valve configurations cover areas with high vulnerability, guarantying individual risks lower than the acceptable risk on all populated areas

    Adhesive Joining of Composite Laminates Using Epoxy Resins with Stoichiometric Offset

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    Polymer matrix composites are used in high performance structures because of their excellent specific strength, toughness and stiffness along the fiber. To realize the full performance advantages of composites, complex, built-up structures must be assembled with adhesive, but uncertainty in bond strength requires manufacturers to install bolts or other crack arrest features to ensure safety in critical applications. The inherent uncertainty in adhesive bonds stems from the material discontinuity at the composite-to-adhesive interfaces, which are susceptible to contamination. In contrast, composites made by co-curing, although limited in size and complexity, result in predictable structures that may be certifiable for commercial aviation with reduced dependence on redundant load paths.1 The pro-posed technology uses a stoichiometric offset of the hardener-to-epoxy ratio on the faying surfaces of laminates. Assembly of the components in a subsequent secondary-co-cure process results in a joint with no material discontinuities

    Conservación in vitro y cultivo de Cyanoprokariotas bentónicas Arrecifales de Providencia y Santa Catalina Islas, Colombia

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    Resumen Colombia cuenta con el 44,86% de su extensi√≥n como territorio marino, ecosistemas con organismos de gran inter√©s para la bioprospecci√≥n como las cianobacterias. Que son una fuente de productos naturales estructuralmente diversos con amplias actividades biol√≥gicas. Este trabajo de investigaci√≥n pretende de manera general cultivar cyanoprokariotes bent√≥nicas arrecifales de Providencia y Santa Catalina Islas ‚Äď Colombia en condiciones de laboratorio para su conservaci√≥n in vitro y producci√≥n de biomasa. Para dar cumplimiento a este objetivo el aislamiento se realiz√≥ por t√©cnicas de rayado en agar y repiques continuos en medio nutritivo l√≠quido BG11; obteniendo 25 cepas. Se realizaron pruebas de conservaci√≥n in vitro en medios solidos nutritivos BG11 medium, C medium, ASNIII medium, Z8 medium, SN medium, F/2 medium y ES medium, suplementados con sal marina (25 g / l). durante 50 d√≠as, con una intensidad de luz de 16,2 őľmol m-2 s-1, fotoperiodo 12:12 luz /oscuridad y una temperatura promedio de 23 ¬įC. Se hicieron cinco replicas por cepa. Se evalu√≥ el crecimiento de acuerdo con el √°rea de colonizaci√≥n e intensidad de color en cada cultivo, mediante programa ImageJ (software de libre acceso). Teniendo como resultados que en el medio nutritivo ASNIII muestran mayor crecimiento los organismos de estudio. Se evalu√≥ el efecto de la irradiancia y fotoperiodo en la producci√≥n de biomasa, clorofila a, carotenos, ficocianina, aloficocianina, ficoeritrina, prote√≠nas, carbohidratos y l√≠pidos en Synechococcus sp., Leptolyngbya sp. 3 y Stanieria sp. sometidos en cultivos discontinuos de 250 ml a intensidades de luz de 18,5; 55,5 y 111 őľmol*m-2*s-1 y horas de exposici√≥n a la luz de 12, 14 y 16. Cada tratamiento con 6 r√©plicas. Encontrando que cada cepa tiene condiciones √≥ptimas diferentes para la acumulaci√≥n de biomasa, pigmentos fotosint√©ticos y contenido bioqu√≠mico. Se hizo un test de toxinas para microcistinas y nodularinas por ELISA y la cepa 7 dio positivo con una concentraci√≥n de 0,3 őľg / l. Finalmente, se realiz√≥ un estudio preliminar de bioactividad a extractos crudos de 18 cepas sobre bacterias Gram positivas, Gram negativas, hongos y cinco l√≠neas celulares de c√°ncer. Los resultados arrojaron que tan solo la cepa 3 tiene inhibe el crecimiento de bacterias Gram positivas y 11 cepas en bacterias Gram negativas. Todos los extractos crudos mostraron reducir la viabilidad de la c√©lula de c√°ncer en diferentes porcentajes.Abstract: Colombia has 44.86% of its extension as a marine territory, ecosystems with organisms of great interest for bioprospecting such as cyanobacteria. They are a source of structurally diverse natural products with extensive biological activities. This research work aims in general to cultivate reef benthic cyanoprokariotes from Providencia and Santa Catalina Islas - Colombia under laboratory conditions for in vitro conservation and biomass production. In order to comply with this objective, the isolation was carried out by means of agar streaking and continuous pealing in liquid nutrient medium BG11; obtaining 25 strains. In vitro conservation tests were performed on nutritious solid media BG11 medium, C medium, ASNIII medium, Z8 medium, SN medium, F / 2 medium and ES medium, supplemented with sea salt (25 g / l). for 50 days, with a light intensity of 16.2 őľmol m-2 s-1, photoperiod 12:12 light / dark and an average temperature of 23 ¬į C. Five replicates were made per strain. Growth was evaluated according to the area of colonization and intensity of color in each culture, by means of the ImageJ program (free access software). Taking as results that in the nutrient medium ASNIII the study organisms show higher growth. The effect of irradiance and photoperiod in the production of biomass, chlorophyll a, carotenes, phycocyanin, allophycocyanin, phycoerythrin, proteins, carbohydrates and lipids in Synechococcus sp., Leptolyngbya sp. 3 and Stanieria sp. submitted in discontinuous cultures of 250 ml at light intensities of 18.5; 55.5 and 111 őľmol * m-2 * s-1 and hours of light exposure of 12, 14 and 16. Each treatment with 6 replicas. Finding that each strain has different optimal conditions for the accumulation of biomass, photosynthetic pigments and biochemical content. A toxin test was made for microcystins and nodularins by ELISA and strain 7 was positive with a concentration of 0.3 őľg / l. Finally, a preliminary bioactivity study was carried out on crude extracts of 18 strains on Gram positive bacteria, Gram negative bacteria, fungi and five cancer cell lines. The results showed that only strain 3 inhibits the growth of Gram positive bacteria and 11 strains in Gram negative bacteria. All the crude extracts showed to reduce the viability of the cancer Cell in different percentages.Maestr√≠

    La creatividad; un fenómeno compuesto por elementos cognitivos, afectivos, biológicos y sociales, que condicionan a la persona creativa

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    Los procesos creativos requieren mejores acercamientos a realidades contextuales en t√©rminos del uso de nuevas tecnolog√≠as en el aula, que garanticen aprendizajes hol√≠sticos encaminados a resolver problemas publicitarios frente a procesos creativos y estrat√©gicos para resolver situaciones en torno a la marca y branding publicitario. Este producto es una investigaci√≥n realizada por La Facultad de Comunicaci√≥n, Publicidad y Dise√Īo de La Universidad Cat√≥lica Luis Amig√≥ de la ciudad de Medell√≠n Colombia, para el Desarrollo de un software que ayude en la estimulaci√≥n y el logro de competencias creativas entre estudiantes de publicidad y dise√Īo

    Estrategia pedagógica basada en acuaponía para la IED Colegio Básico Postprimaria Rural Hortigal

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    En la b√ļsqueda de herramientas pedag√≥gicas transversales para la ense√Īanza de las ciencias naturales, se hace necesario implementar estrategias experimentales que motiven al estudiante no solo a cumplir con las actividades asignadas, sino por el contrario que las ponga en pr√°ctica en su diario vivir. La IED Colegio B√°sico Postprimaria Rural Hortigal del municipio de La Palma, Cundinamarca, se caracteriza por tener espacios para el desarrollo de actividades agropecuarias experimentales a peque√Īa escala en el √°rea de las ciencias naturales. Sin embargo, las practicas establecidas en su malla curricular apuntan al desarrollo de t√©cnicas tradicionales que generan afectaciones negativas al medio ambiente, siendo una muestra de las practicas poco amigables que realizan a diarios los estudiantes y sus familias en las parcelas donde viven. Es as√≠ que este proyecto tiene como objetivo establecer una estrategia pedag√≥gica de ense√Īanza a partir de un sistema de cultivo acuap√≥nico que faciliten los procesos de aprendizaje en educaci√≥n ambiental y sea tenido en cuenta para ser replicado por cada uno de los alumnos y en sus proyectos productivos familiares.In the search for pedagogical tools for the teaching of natural sciences is necessary use motivational pedagogical strategies who involved the student and his dayly life. The IED Colegio B√°sico Postprimaria Rural Hortigal from La Palma-Cundinamarca has physical space for the development of experiments on agricultural activities in small scale, however according with the syllabus only the traditional techniques has been working without questioning its negative impact in the environment, even in the student‚Äôs houses the practices are far to be environmental friendly. Using an aquaponic cultivation system a pedagogical strategy is developed with the goal of be replicated by every family productive project
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