2,931 research outputs found
VNUML vs GNS3 en el desarrollo de laboratorios de redes virtuales
El aprendizaje práctico de redes de computadores
es reconocido como un proceso crítico que permite
a los estudiantes consolidar los conceptos introducidos
en las lecciones teóricas. En este sentido, las
tecnologías de virtualización están adquiriendo gran
relevancia debido a que permiten desarrollar laboratorios
de redes de computadores con un reducido
coste de despliegue y gestión. Este artículo presenta
un análisis comparativo entre GNS3 y VNUML, que
son herramientas de virtualización open-source que
han sido empleadas para el desarrollo de laboratorios
de red virtuales para llevar a cabo el proceso de
enseñanza-aprendizaje en las asignaturas Arquitectura
de Redes y Arquitectura de Redes Avanzadas
del Grado en Ingeniería Informática impartido en la
Universidad de Murcia. El estudio presenta las principales
ventajas y/o deficiencias de cada herramienta
tanto para profesores como alumnos y se identifican
los escenarios en los que parece más adecuada su
utilización.SUMMARY -- The practical learning of computer networks is
known to be a critical process in order to allow
students to consolidate the concepts introduced in
theoretical lessons. In this sense, virtualization technologies
are becoming popular since they allow
to set up a computer network laboratory with a reduced
deployment and management cost. This paper
presents a comparative analysis performed between
GNS3 and VNUML, which are open-source
tools for virtualization that have been used for developing
virtual network laboratories that support the
teaching-learning process in the Networks Architecture
and Advanced Networks Architecture subjects
of the Computer Engineering degree at the University
of Murcia. The study presents the main advantages
and/or deficiencies of each tool not only for professors
but also for students and identifies the scenarios
where the use of each tool seems to be more
appropriate.Peer Reviewe
Experiencia con la herramienta de virtualización VNUML para la enseñanza de redes de computadores
La virtualización permite disponer y configurar infraestructuras de red con un coste asumible para un laboratorio y, a diferencia de los simuladores, muestra un comportamiento real del sistema. Este
artículo presenta la metodología que seguimos en la asignatura de Redes de la Facultad de Informática de la Universidad de Murcia para la enseñanza práctica de conceptos tales como encaminamiento,
movilidad IP, balanceo de carga y alta disponibilidad por medio de la herramienta de virtualización de código abierto VNUML. Para mostrar estos conceptos hemos añadido diversas utilidades al sistema de ficheros utilizado en VNUML. Gracias a estas herramientas, los alumnos han podido mejorar
el aprendizaje de estos conceptos como lo refutan las encuestas realizadas.Peer Reviewe
VNUML vs GNS3 en el desarrollo de laboratorios de redes virtuales
El aprendizaje práctico de redes de computadores es reconocido como un proceso crítico que permite a los estudiantes consolidar los conceptos introducidos en las lecciones teóricas. En este sentido, las tecnologías de virtualización están adquiriendo gran relevancia debido a que permiten desarrollar laboratorios de redes de computadores con un reducido coste de despliegue y gestión. Este artículo presenta un análisis comparativo entre GNS3 y VNUML, que son herramientas de virtualización open-source que han sido empleadas para el desarrollo de laboratorios de red virtuales para llevar a cabo el proceso de enseñanza-aprendizaje en las asignaturas Arquitectura de Redes y Arquitectura de Redes Avanzadas del Grado en Ingeniería Informática impartido en la Universidad de Murcia. El estudio presenta las principales ventajas y/o deficiencias de cada herramienta tanto para profesores como alumnos y se identifican los escenarios en los que parece más adecuada su utilización.The practical learning of computer networks is known to be a critical process in order to allow students to consolidate the concepts introduced in theoretical lessons. In this sense, virtualization technologies are becoming popular since they allow to set up a computer network laboratory with a reduced deployment and management cost. This paper presents a comparative analysis performed between GNS3 and VNUML, which are open-source tools for virtualization that have been used for developing virtual network laboratories that support the teaching-learning process in the Networks Architecture and Advanced Networks Architecture subjects of the Computer Engineering degree at the University of Murcia. The study presents the main advantages and/or deficiencies of each tool not only for professors but also for students and identifies the scenarios where the use of each tool seems to be more appropriate.Este trabajo ha sido parcialmente financiado por el “Programa de Ayuda a los Grupos de Excelencia de la Fundación Séneca 04552/GERM/06”
Experiencia con la herramienta de virtualización VNUML para la enseñanza de redes de computadores
La virtualización permite disponer y configurar infraestructuras de red con un coste asumible para un laboratorio y, a diferencia de los simuladores, muestra un comportamiento real del sistema. Este artículo presenta la metodología que seguimos en la asignatura de Redes de la Facultad de Informática de la Universidad de Murcia para la enseñanza práctica de conceptos tales como encaminamiento, movilidad IP, balanceo de carga y alta disponibilidad por medio de la herramienta de virtualización de código abierto VNUML. Para mostrar estos conceptos hemos añadido diversas utilidades al sistema de ficheros utilizado en VNUML. Gracias a estas herramientas, los alumnos han podido mejorar el aprendizaje de estos conceptos como lo refutan las encuestas realizadas.Este trabajo ha sido parcialmente financiado por el “Programa de Ayuda a los Grupos de Excelencia de la Fundación Séneca 04552/GERM/06” y por el proyecto CICYT TIN2008-06441-C02-02
Tracking magmatism and oceanic change through the early Aptian Anoxic Event (OAE 1a) to the late Aptian: Insights from osmium isotopes from the westernmost Tethys (SE Spain) Cau Core
Some of the major Carbon cycle perturbations of the Phanerozoic occurred during the Aptian, in relation to magmatism. The highest temperatures reconstructed for the Cretaceous Period correspond to the Oceanic Anoxic Event of the early Aptian (OAE 1a), an episode of accelerated global change. Here we present a chemostratigraphic study based on osmium isotopes integrated with high-resolution Carbon-Oxygen stable isotope data from the Cau Core (Western Tethys, SE Spain), including a 6.4 Ma record from the early to the late Aptian. This high-resolution study of the continuous and expanded Cau section permits a thorough understanding of the duration of the Aptian events, as well as an evaluation of the mechanisms triggering the abrupt changes of the global carbon and osmium cycles and their interdependence. Here we show that the Large Igneous Province (LIP) Aptian magmatism initiated 550–750 kyr prior to the OAE 1a, and persisted for 1.4 Myr after the event, influencing the composition of seawater for 2.8 Myr. We show a continuous Os isotope record encompassing the OAE 1a and the late Aptian for the first time, and demonstrate that the recovery from the exceptionally unradiogenic composition of seawater Os produced by the dominance of the Ontong Java Plateau volcanism, was slow. Our results demonstrate the different time duration of some events, and the asynchronous relationship between the carbon and osmium cycles
Efectos de un programa Pilates-Capacidad cardiorrespiratoria sobre variables psicológicas de adultas-mayores: Aprendizaje-Servicio
The ageing of the population is a phenomenon of today's society. The economic, labor, structural and health repercussions are a challenge for any administration. The physical condition of this group is progressively decreasing if there are no regular physical activity habits. The present study aims to analyse the effects of a 12-week concurrent programme of Pilates and cardiorespiratory fitness through Service-Learning on the subjective happiness, self-perception of successful ageing and health-related quality of life of adult-older women. The results obtained showed an improvement in the perception of successful ageing and health-related quality of life (bodily pain, general health, vitality and emotional role) of the participants. In conclusion, the importance of regular physical practice and improvement of physical fitness on psychological factors of older adult women must be highlighted.El envejecimiento de la población es un fenómeno presente en la sociedad actual. La repercusión a nivel económico, laboral, estructural y de salud supone un reto para cualquier administración. La condición física de este colectivo va mermando progresivamente si no hay unos hábitos de práctica de actividad física regulares. El presente estudio pretende analizar los efectos de un programa concurrente de Pilates y capacidad cardiorrespiratoria de 12 semanas, a través de Aprendizaje-Servicio, sobre la felicidad subjetiva, la percepción de un envejecimiento exitoso y la calidad de vida relacionada con la salud de mujeres adultas-mayores. Los resultados obtenidos mostraron una mejora en la percepción de un envejecimiento exitoso y calidad de vida relacionada con la salud (dolor corporal, salud general, vitalidad y rol emocional) de las participantes. Como conclusión, cabe destacar la importancia de una práctica física regular y mejora de la condición física sobre factores psicológicos de mujeres adultas-mayores
Interplay between genetics and lifestyle on pain susceptibility in women with fibromyalgia: the al-Ándalus project
This work was supported by the Spanish Ministry of Economy and Competitiveness (I + D+i DEP2010-15639, I + D+i DEP2013-40908-R to M.D.-F.; BES-2014-067612 to F.E.-L.), the Spanish Ministry of Education (FPU13/03410 to D.S.-T.; FPU15/0002 to B.G.-C.), the Consejeria de Turismo, Comercio y Deporte, Junta de Andalucia (CTCD-201000019242-TRA to M.D.-F.), the Consejeria de Salud, Junta de Andalucia (PI-0520-2016 to M.D.-F.) and the University of Granada, Plan Propio de Investigacion 2016, Excellence actions: Units of Excellence; Unit of Excellence on Exercise and Health (UCEES). The funders of the present study did not have any role in the study design, data collection and analyses, decision to publish or preparation of the manuscript.Objectives. It is widely acknowledged that the experience of pain is promoted by both genetic susceptibility
and environmental factors such as engaging in physical activity (PA), and that pain-related cognitions are also
important. Thus, the purpose of the present study was to test the association of 64 polymorphisms (34 candidate
genes) and the gene–gene, gene–PA and gene–sedentary behaviour interactions with pain and pain-related
cognitions in women with FM.
Methods. Saliva samples from 274 women with FM [mean (S.D.) age 51.7 (7.7) years] were collected for extracting
DNA. We measured PA and sedentary behaviour by accelerometers for a week, pain with algometry and questionnaires,
and pain-related cognitions with questionnaires. To assess the robustness of the results, a meta-analysis
was also performed.
Results. The rs6311 and rs6313 polymorphisms (5-hydroxytryptamine receptor 2A, HTR2A) were individually
related to algometer scores. The interaction of rs4818 (catechol-O-methyltransferase, COMT) and rs1799971 (opioid
receptor l gene, OPRM1) was related to pain catastrophizing. Five gene–behaviour interactions were significant:
the interactions of sedentary behaviour with rs1383914 (adrenoceptor alpha 1A, ADRA1A), rs6860 (charged multivesicular
body protein 1A, CHMP1A), rs4680 (COMT), rs165599 (COMT) and rs12994338 (SCN9A) on bodily pain subscale
of the Short Form 36. Furthermore, the meta-analysis showed an association between rs4680 (COMT) and
severity of FM symptoms (codominant model, P-value 0.032).
Conclusion. The HTR2A gene (individually), COMT and OPRM1 gene–gene interaction, and the interactions
of sedentary behaviour with ADRA1A, CHMP1A, COMT and SCN9A genes were associated with pain-related
outcomes. Collectively, findings from the present study indicate a modest contribution of genetics and gene–
sedentary behaviour interaction to pain and pain catastrophizing in women with FM. Future research should
examine whether reducing sedentary behaviour is particularly beneficial for reducing pain in women with genetic
susceptibility to pain.Spanish Government I + D+i DEP2010-15639
I + D+i DEP2013-40908-R
BES-2014-067612
FPU13/03410
FPU15/0002Junta de Andalucia CTCD-201000019242-TRA
PI-0520-2016University of Granada, Plan Propio de InvestigacionUnit of Excellence on Exercise and Health (UCEES
Progradation of a shallow carbonate platform developed on a fault-block in the Western Tethys (lower Aptian, Sierra de Bedmar-Jódar, Prebetic of Jaén, Spain).
The Middle Member of the Llopis Fm in the Sierra de Bedmar-Jódar Unit of the Prebetic Zone of Jaén (southern Spain) was deposited on a shallow-marine platform of the Southern Iberian Continental Margin during the earliest Aptian. Detailed field logging of nine stratigraphic sections and facies mapping have allowed seven lithofacies associations (L1–L6) to be distinguished, one siliciclastic (L1) and five carbonate facies (L2–6). The succession is composed of eight consecutive elemental sequences of lithofacies associations L1–L6. Each elemental sequence is interpreted as representing one episode of shallowing-upwards carbonate deposition in a very shallow platform-lagoon that was bounded shoreward by clastic/ooid bars and passed seaward either to stromatoporoid bioconstructions (bioherms and biostromes) or rudist biostromes. The successive elemental sequences show north-eastward progradational geometries. Three phases of platform development are identified: (1) installation of the shallow platform; (2) development of a lagoon bounded by a stromatoporoid barrier and (3) development of an Urgonian-type platform dominated by rudists. During the early Aptian, the Bedmar-Jódar platform was partially isolated from the rest of the Prebetic platform and showed overall progradation towards the NE, in contrast to the general south-eastward progradational trend of the Prebetic platform. Sedimentation was controlled by rift-generated extensional tectonics that resulted in tilting of the platform block, causing the deviation of progradation from the general trends of the Prebetic Platform. In addition, climatic influence is inferred from the presence of siliciclastic sediments derived from weathering of the hinterland, which restricted the carbonate factory.Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEUniversidad de JaénSecretaría de Estado de I + D + iJunta de Andalucíapu
Integrated cyclostratigraphy of the Cau core (SE Spain) - a timescale for climate change during the early Aptian Anoxic Event (OAE 1a) and the late Aptian
We report a cyclostratigraphic study performed on the Cau core (Spain), which is considered an Aptian stratigraphic reference for global correlation and paleoenvironmental reconstruction. This investigation presents an astronomical timescale for the Aptian from Ap2a to Ap14 carbon-isotope stages. Based on the evaluation of a multiproxy dataset from the Cau core, we recalibrate the age and duration of the different biozones, bioevents, chemostratigraphic substages and horizons from the early and late Aptian, with special focus on the Selli Event, providing a new astronomical timescale framework for the Aptian climate. From the recognition of 14 long-eccentricity cycles, we propose a time span of 5.67 Ma for the Ap2a to top of Ap14 C-isotope segments, and ages of 120.82 Ma for the onset of the nannoconid crisis, and 120.20 Ma for the onset of the oceanic anoxic event (OAE) 1a. Calculations yield a duration of 1.47 Ma for the OAE 1a. We estimate the age for the onset of the main Os isotope non-radiogenic phase as 120.08 Ma, 120 ka after the onset of the OAE 1a. The high-resolution data from the Cau core provides further insights in the temporal constraints of the OAE 1a and other Aptian paleoclimatic events. The onset of the main Os-isotope non-radiogenic excursion occurring 120 ka after the onset of the OAE 1a reinforces the theory of rapid destabilization of methane hydrates as the trigger of the anoxic event, that preceded the onset of large-scale volcanism
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