Propuesta Ágil para Gestionar Proyectos Educativos Informáticos en Educación Superior

El artículo describe la gestión ágil de proyectos educativos informáticos en contextos de educación superior en la Argentina. En particular, esta experiencia se sitúa en relación con el proceso de enseñanza y aprendizaje significativo debido la importancia del desarrollo del software en todas sus dimensiones y aplicaciones. En el método se describen los elementos adaptados de SCRUM, metodología de trabajo ágil iterativa e incremental para la gestión de proyectos, y cómo se incorpora un sistema de matrices de tres categorías. El resultado de esta innovadora integración se plasma en una propuesta ágil que integra prácticas y artefactos de SCRUM con un sistema de matrices categoriales orientadas a presentar: los objetivos correlacionados, la relación de actores e instrumentos de recolección de datos y una matriz que refleja: la Apropiación de aprendizajes para el uso de una metodología ágil, el Reconocimiento de los roles de los integrantes del equipo, la Comunicación eficaz para la interacción de los miembros del equipo. La propuesta se valida considerando la presentación y exposición de los trabajos integradores en una asignatura de la carrera Licenciatura en Sistemas de Información. Finalmente, es menester abordar el proceso de enseñanzaaprendizaje significativo situado en contexto ágiles atendiendo a la complejidad y emergentes continuos en la actual sociedad del conocimiento. The article describes an agile managing for educational IT projects in higher education. Argentina is the reference context. In particular, the experience is placed in relation to the process of teaching and learning meaning, considering the software development in all its dimensions and applications. The method describes the elements adapted from SCRUM, iterative and incremental agile working methodology for project management, and how a three-category matrix system is incorporated. The result of this innovative integration is embodied in an agile proposal that integrates SCRUM practices and artifacts with a system of categorical matrices oriented to present: the correlated objectives, the relationship of actors and data collection instruments and the last one containing the following items: the appropriation of learning for the use of an agile methodology, the recognition of the roles of the team members, the effective communication for the interaction of the team members. The proposal is validated considering the presentation and exposition of the integrative works in a subject of the Information Systems degree. Finally, it is necessary to approach the process of significant teaching-learning located in an agile context, taking into account the complexity and continuous emergences in the current knowledge society

Técnicas de control de concurrencia en base de datos: implementación en un sistema de gestión

Las transacciones concurrentes en una aplicación que se implementa en una estructura cliente servidor, es de vital importancia, dado que mantener la coherencia, integridad y durabilidad de los datos que son consumidos no es una tarea trivial. La elección de una técnica de manejo de concurrencia que permita la serialización de las transacciones y la coherencia de las operaciones realizadas sobre dichos datos, debe ejecutarse de acuerdo a la naturaleza del problema que se esté tratando de resolver. En el presente artículo, se presenta la aplicación técnicas de concurrencia optimista, al modulo “autogestión de compras” en un Sistema de Gestión de Ventas. Los resultados demuestran que con la aplicación de la técnica mencionada y de acuerdo a operaciones que no suponen un bloqueo, o que el bloqueo resultaría costoso en el rendimiento del sistema, es decir, en tiempo y recursos, se consigue mantener la integridad y coherencia de los datos.X Workshop Innovación en Sistemas de Software (WISS)Red de Universidades con Carreras en Informática (RedUNCI

Técnicas de control de concurrencia en base de datos: implementación en un sistema de gestión

Las transacciones concurrentes en una aplicación que se implementa en una estructura cliente servidor, es de vital importancia, dado que mantener la coherencia, integridad y durabilidad de los datos que son consumidos no es una tarea trivial. La elección de una técnica de manejo de concurrencia que permita la serialización de las transacciones y la coherencia de las operaciones realizadas sobre dichos datos, debe ejecutarse de acuerdo a la naturaleza del problema que se esté tratando de resolver. En el presente artículo, se presenta la aplicación técnicas de concurrencia optimista, al modulo “autogestión de compras” en un Sistema de Gestión de Ventas. Los resultados demuestran que con la aplicación de la técnica mencionada y de acuerdo a operaciones que no suponen un bloqueo, o que el bloqueo resultaría costoso en el rendimiento del sistema, es decir, en tiempo y recursos, se consigue mantener la integridad y coherencia de los datos.X Workshop Innovación en Sistemas de Software (WISS)Red de Universidades con Carreras en Informática (RedUNCI

PRENOLIN project. Results of the validation phase at sendai site

One of the objectives of the PRENOLIN project is the assessment of uncertainties associated with non-linear simulation of 1D site effects. An international benchmark is underway to test several numerical codes, including various non-linear soil constitutive models, to compute the non-linear seismic site response. The preliminary verification phase (i.e. comparison between numerical codes on simple, idealistic cases) is now followed by the validation phase, which compares predictions of such numerical estimations with actual strong motion data recorded from well-known sites. The benchmark presently involves 21 teams and 21 different non-linear computations. Extensive site characterization was performed at three sites of the Japanese KiK-net and PARI networks. This paper focuses on SENDAI site. The first results indicate that a careful analysis of the data for the lab measurement is required. The linear site response is overestimated while the non-linear effects are underestimated in the first iteration. According to these observations, a first set of recommendations for defining the non-linear soil parameters from lab measurements is proposed. PRENOLIN is part of two larger projects: SINAPS@, funded by the ANR (French National Research Agency) and SIGMA, funded by a consortium of nuclear operators (EDF, CEA, AREVA, ENL)

Aplicación y mejoras al método MPM para el análisis de deslizamientos y movimientos de tierra

En este artículo se presentan dos extensiones al Método de Puntos Materiales (MPM) que mejoran la aptitud del método en la simulación de deslizamientos y movimientos de tierra. La primera consiste en el uso de una formulación de multi-fase que permite el análisis de mezclas sólido-fluido y su interacción a varias escalas. La segunda provee una técnica apropiada para mitigar el problema de "locking" que surge de usar, en el MPM estándar, funciones de interpolación lineales en una grilla Euleriana. Para este caso se propone una estrategia de relajación basada en el principio de Hu-Washizu y se demuestra su aplicabilidad en la modelación de flujos granulares

Microclimate alterations caused by agricultural hail net coverage and effects on apple tree yield in subtropical climate of Southern Brazil

The use of hail net coverage on plants is an effective measure to mitigate damage caused by hailstorms. In southern Brazil, areas with apple orchards under hail net coverage have increased in recent years. However, little is known about the possible effects on the microclimate and, consequently, on plant growth, crop yield and fruit quality. The hypothesis of this study was that hail net promotes microclimate and yield changes in apple orchards. The objective was to characterize the microclimate and production of apple trees cultivated under hail nets and to consequently generate numeric parameters that can be used in the management of apple orchards and in crop modeling. The study was conducted in commercial orchards growing under hail net and open sky. Continuous measurements of photosynthetically active radiation (PAR), air temperature and humidity, wind speed and rainfall were performed. Production was assessed based on the number and weight of fruits per plant. The hail nets reduced PAR by 32.8% and the wind speed by 30%. In contrast, coverage did not alter the air temperature, humidity or rainfall. The yield of apples tends to be higher under hail net and this is more pronounced when one hailstorm event occur. These results are important for researchers, and apple farmers to establish criteria for decision making regarding the implementation of hail net coverage and to develop appropriate management systems for protecting orchards to ensure and improve fruit production. Overall, the effects of long-term micrometeorological factors are essential to perform modeling of agricultural production

Effects of Ground Failure on Bridges, Roads, and Railroads

The long duration and strong velocity content of the motions produced by the 27 February 2010 Maule earthquake resulted in widespread liquefaction and lateral spreading in several urban and other regions of Chile. In particular, critical lifeline structures such as bridges, roadway embankments, and railroads were damaged by ground shaking and ground failure. This paper describes the effects that ground failure had on a number of bridges, roadway embankments, and railroads during this major earthquake

Whole genome comparison of a large collection of mycobacteriophages reveals a continuum of phage genetic diversity

The bacteriophage population is large, dynamic, ancient, and genetically diverse. Limited genomic information shows that phage genomes are mosaic, and the genetic architecture of phage populations remains ill-defined. To understand the population structure of phages infecting a single host strain, we isolated, sequenced, and compared 627 phages of Mycobacterium smegmatis. Their genetic diversity is considerable, and there are 28 distinct genomic types (clusters) with related nucleotide sequences. However, amino acid sequence comparisons show pervasive genomic mosaicism, and quantification of inter-cluster and intra-cluster relatedness reveals a continuum of genetic diversity, albeit with uneven representation of different phages. Furthermore, rarefaction analysis shows that the mycobacteriophage population is not closed, and there is a constant influx of genes from other sources. Phage isolation and analysis was performed by a large consortium of academic institutions, illustrating the substantial benefits of a disseminated, structured program involving large numbers of freshman undergraduates in scientific discovery