Numerical model for the study of hydrodynamics on bays and estuaries

A nonlinear implicit finite element model for the solution of two-dimensional (2-D) shallow water equations, based on a Galerkin formulation of the 2-D estuaries hydrodynamic equations, has been developed. Spatial discretization has been achieved by the use of isoparametric, Lagrangian elements. To obtain the different element matrices, Simpson numerical integration has been applied. For time integration of the model, several schemes in finite differences have been used: the Cranck-Nicholson iterative method supplies a superior accuracy and allows us to work with the greatest time step Δt; however, central differences time integration produces a greater velocity of calculation. The model has been tested with different examples to check its accuracy and advantages in relation to computation and handling of matrices. Finally, an application to the Bay of Santander is also presented

A numerical solution of the dispersion equation of the guided wave propagation in N-layered media

The theory of guided wave propagation in N-layered media is presented. The derivation of the dispersion equation is obtained from the application of appropriate boundary and continuity conditions to the solution of the general wave propagation. The resulting dispersion equation is given in the form of a determinant of a 4Nx4N coefficient matrix. A numerical procedure is proposed to represent and solve the implicit equation resulting. The validity and efficiency of the proposed numerical model is discussed. Dispersion curves characterizing the N-layered material are obtained and compared to published results. In order to illustrate the use of the model to different practical applications, such as coating problems of plasma spray on a turbine blade, aircraft multiple layers, ice detection, etc. a sensitivity analysis of the dispersion curves respect to depth imperfections is given

Estudio cultura Organizacional en la E.S.E. Hospital Universitario San Jorge de Pereira. Cooperativa de Trabajo Asociado Multiser CTA, Induaseo Profesalud CTA, Nutrisalud Risaralda Ltda, Imágenes Diagnósticas

El presente trabajo analiza la cultura organizacional de la ESE Hospital San Jorge de Pereira con base en entrevistas realizadas a funcionarios de 5 cooperativas que prestan sus servicios al interior de la organización, empleando métodos y técnicas de la estadística descriptiva pertinentes, con el criterio de muestreo aleatorio simple y un de margen de error 5 %. Los resultados evidencian los factores socio-culturales formales e informales, tanto del hospital y las cooperativas como de las personas, que afectan la consecución de los resultados institucionales lo que representa un riesgo para la prestación del servicio y la permanencia de la organización, según lo mencionan los funcionarios entrevistados. Realizado el análisis de los hallazgos referidos a cada una de las categorías definidas y abordadas (identidad, convivencia, trascendencia y cambio) se consignaron las propuestas, conclusiones y recomendaciones que se cree de ser llevadas a cabo pueden mejorar la cultura organizacional del centro de salud, las relaciones interpersonales, ínter cooperativas y de estos con las directivas del Hospital.The present work the culture analyzes organizational of ESE Hospital Pereira's Saint George with base in interviews realized to civil servants of 5 cooperatives who give his services to the interior of the organization, using methods and pertinent technologies of the descriptive statistics, with the criterion of random simple sampling and one of margin of mistake 5 %. The results demonstrate the socio-cultural formal and informal, factors so much of the hospital and the cooperatives as of the persons, who affect the attainment of the institutional results what represents a risk for the service and the permanency of the organization, as it the interviewed civil servants mention. Realized the analysis of the findings referred to each of the categories definite and approached (identity, conviviality, transcendency and change) recorded the offers, conclusions and recommendations that one believes of being carried out can improve the culture organizacional of the center of health, the interpersonal relations, ínter cooperative and of these with the boards of the Hospital

Modelo numérico basado en el método de los elementos finitos para el estudio de la hidrodinámica de bahías y estuarios

Se ha desarrollado un modelo implícito no lineal 2-D en EF para la resolución de las ecuaciones de aguas poco profundas. La discretización espacial se ha realizado por medio de elementos lagrangianos isoparamétricos. Se ha aplicado la integración numérica de Simpson para obtener las matrices elementales, y para la integración temporal se han utilizado diferentes esquemas en diferencias finitas, comprobándose el modelo con diferentes ejemplos

Desarrollo de una metodología para la interpretación y simplificación del modelo CMMI para desarrollo de software

La calidad del software es muy importante para las empresas y organizaciones hoy en día, porque este es un reflejo y una carta de presentación ante sus clientes, existen algunas iniciativas del sector público y privado que impulsan campañas para que las organizaciones puedan lograr certificaciones de calidad. Una de estas iniciativas es el programa lanzado por el SENA y Proexport llamado implementación y evaluación formal de CMMI, que busca la adopción de modelos de producción con estándares internacionales de calidad, lo cual le permita a las empresas ingresar al mapa mundial de software de calidad. La forma en que una compañía opera, los procesos que esta sigue para alcanzar sus objetivos, impacta directamente en su capacidad de producción y crecimiento. Por lo que el modelo CMMI propone las mejores prácticas para las empresas de desarrollo de software, e indica que si se siguen estas prácticas y se aplican correctamente, se puede llegar a producir software de alta calidad de forma rápida y económica CMMI indica como principales beneficios, la reducción de riesgos, la asignación mas predecible de presupuestos y horarios, la reducción en el reproceso. Aun así en la actualidad, al parecer algunas de las empresas de desarrollo de software, se resisten o simplemente no están interesadas en la implementación de las mejores prácticas del modelo CMMI. La lista conocida de razones para no implementar CMMI es larga, indican entre otros motivos que consideran que aún son muy pequeñas para ello, pero también se destacan motivos como: es muy costoso, toma mucho tiempo, se usa otro método para mejorar los procesos, no están claros los beneficios, los beneficios potenciales no son los deseados, no aplica a nuestros procesos etc. Al parecer son más las empresas pequeñas que se mantienen al margen de la implementación de CMMI, puede decirse que para ellas es más difícil, tomar la decisión de dedicar, parte de su capital y de su tiempo a la implementación de una metodología que desde el punto de vista de estas empresas no deja en claro los beneficios, y sin la cual esta claro que pueden operar

On a course on computer cluster configuration and administration

[EN] Computer clusters are today a cost-effective way of providing either high-performance and/or high-availability. The flexibility of their configuration aims to fit the needs of multiple environments, from small servers to SME and large Internet servers. For these reasons, their usage has expanded not only in academia but also in many companies. However, each environment needs a different ¿cluster flavour¿. High-performance and high-throughput computing are required in universities and research centres while high-performance service and high-availability are usually reserved to use in companies. Despite this fact, most university cluster computing courses continue to cover only high-performance computing, usually ignoring other possibilities. In this paper, a master-level course which attempts to fill this gap is discussed. It explores the different types of cluster computing as well as their functional basis, from a very practical point of view. As part of the teaching methodology, each student builds from scratch a computer cluster based on a virtualization tool. The entire process is designed to be scalable. The goal is to be able to apply it to an actual computer cluster with a larger number of nodes, such as those the students may subsequently encounter in their professional life.This work was supported in part by the Spanish Ministerio de Economia y Competitividad (MINECO) and by FEDER funds under Grant TIN2015-66972-C5-1-R.López Rodríguez, PJ.; Baydal Cardona, ME. (2017). On a course on computer cluster configuration and administration. Journal of Parallel and Distributed Computing. 105:127-137. https://doi.org/10.1016/j.jpdc.2017.01.009S12713710

Teaching high-performance service in a cluster computing course

[EN] Most courses on cluster computing in graduate and postgraduate studies are focused on parallel programming and high-performance/high-throughput computing. This is the typical usage of clusters in academia and research centres. However, nowadays, many companies are providing web, mail and, in general, Internet services using computer clusters. These services require a different ``cluster flavour'': high-performance service and high availability. Despite the fact that computer clusters for each environment demand a different configuration, most university cluster computing courses keep focusing only on high-performance computing, ignoring other possibilities. In this paper, we propose several teaching strategies for a course on cluster computing that could fill this gap. The content developed here would be taught as a part of the course. The subject shows several strategies about how to configure, test and evaluate a high-availability/load-balanced Internet server. A virtualization-based platform is used to build a cluster prototype, using Linux as its operating system. Evaluation of the course shows that students knowledge and skills on the subject are improved at the end of the course. On the other hand, regarding the teaching methodology, the results obtained in the yearly survey of the University confirm student satisfaction.This work was supported in part by the Spanish Ministerio de Economia y Competitividad (MINECO) and by FEDER funds under Grant TIN2015-66972-C5-1-R.López Rodríguez, PJ.; Baydal Cardona, ME. (2018). Teaching high-performance service in a cluster computing course. Journal of Parallel and Distributed Computing. 117:138-147. https://doi.org/10.1016/j.jpdc.2018.02.027S13814711

Finite element simulation of dispersion in the Bay of Santander

Two mathematical models are used to simulate pollution in the Bay of Santander. The first is the hydrodynamic model that provides the velocity field and height of the water. The second gives the pollutant concentration field as a resultant. Both models are formulated in two-dimensional equations. Linear triangular finite elements are used in the Galerkin procedure for spatial discretization. A finite difference scheme is used for the time integration. At each time step the calculated results of the first model are input to the second model as field data. The efficiency and accuracy of the models are tested by their application to a simple illustrative example. Finally a case study in simulation of pollution evolution in the Bay of Santander is presente