Revista de Ingeniería (Facultad de Ingeniería, Universidad de los Andes)
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Simulador para el nodo de conmutación atm
No full textEste artículo muestra los resultados del estudio de los nodos de conmutación “switches” multiestado ATM, con topologías de construcción Banyan, con manejo de memoria estática y compartida, localización de las colas a la entrada-salida de cada uno de los puertos y “switch” elemental (SE) de 2x2 ó 4x4. Se aplican diferentes técnicas de administración de memoria como “Backpressure”, “Pushout”, “Restricted Backpressure” y “Delay Pushout”. En cuanto a las fuentes de entrada se simuló tráfico regular con un proceso de Bernoulli y tráfico tipo ráfaga mediante un proceso interrumpido de Bernoulli (IBP) y una fuente ON-OFF. Para realizar el estudio se implementó una herramienta de simulación, mediante la técnica de eventos discretos y el simulador fue validado con varias publicaciones
Generación de energía eléctrica con turbinas wells
No full textThe present article, briefly, describes the theoretical design procedure of Wells turbines, typically utilized in Pneumatic Wave Energy Conversion Systems (PWECS). The principle behind the PWECS consists of extracting the pneumatic energy caused by an oscillating water column by the entrance of water waves in enclosed spaces. The paper establishes the design and experimental testing of a small permanent magnet generator suited for the wells turbine under development. The adequate matching between the Wells turbine and the generator has been conceived as a portable 50w d.c. electricity generation device; to be used, either, to powering telecommunications systems in military operations or to power navigation aids in rivers or at se
Non-Structural masonry walls strengthened with GFRP laminates
No full textOne of the major construction systems in Colombia, and in general throughout Latin America, consists of multistory moment resisting reinforced concrete (RC) frames filled with unreinforced masonry (URM) walls. These non-structural masonry walls are conventionally built using clay tiles. Due to the high seismic activity in Colombia, this kind of masonry wall is prone to damage. One of the alternatives being explored in Colombia to prevent the failure or lessen the damages in clay tile URM walls is to strengthen them with Glass Fiber Reinforced Polymer (GFRP) laminates. This paper presents promising results of experimental tests conducted on twenty-six wallettes of 9x70x70 cm and 9x120x120 cm, which were strengthened with different layouts of GFRP laminates. In addition, a full-scale wall was tested to validate the technology. The paper discusses the effect of GFRP laminates on the failure mechanisms, capacity and ductility parameters as well as on the overall reduction of earthquake damage for clay tile URM walls
Generación de fuentes sintéticas de tráfico de video vbr mpeg
No full textThis paper presents a methodology for implementation of synthetic of VBR MPEG video traffic, that also of model the marginal distribution capture in a high grade the present correlations in the empirical video traffic traces. It realizes an statistical and simulation comparison with empirical and synthetic traces. In the simulation its compare the parameters of performance of a system conformed for a buffer finite and an ATM link of output with empirical and synthetic traffic input. Its evidence that temporal dependence is the characteristic limitative of the models of generation of synthetic traffic
Modelo de predicción y manejo de cultivos de rosas
No full textEl presente artículo muestra los modelos manuales y computacionales, desarrollados para predecir y manejar los cultivos de rosas en la sabana de Bogotá, a partir de sus diferentes estados fenológicos, con base en el factor grados - día, y previo análisis de las condiciones climatológicas dentro de los invernaderos.
La investigación fue patrocinada por la Asociación Colombiana de Exportadores de Flores, Asocolflores, y se desarrolló entre Agosto de 2000 y diciembre de 2001
III Convocatoria para la actualización del index de publicaciones seriadas científicas y tecnológicas colombianas
No full textConceptos y retos en la atención de incidentes de seguridad y la evidencia digital
No full textThe continuous reports of security vulnerabilities and new ways to have access to privileged resources of our host, notice the necessity to be prepared to face a possible attack in our computational infrastructures and Communications. Therefore, the organizations that would maintain high security levels, require to establish, along with the good computer security practices, computer incident response teams, strategies for the identification and harvesting of the evidence of the incident, as well as personal permanently trained in computer security. In this sense, this article offers to readers an analysis scenario to think about incident response and digital evidence
Modelación de la confiabilidad y optimización de la inversión en infraestructura vial
No full textA new approach to transport systems reliability based on an entirely probabilistic approach is proposed. This approach comprises two key elements: the state of the infrastructure and the behavior of the network users. It considers the state of the network through the relationship between the failure and repair rates of every link comprising the network and the user decision process as he/she uses the network to travel between two centroids. The procedure proposes an efficient strategy for modeling and managing transportation networks. The results are useful for the optimum allocation of resources for maintenance and rehabilitation
