Sistemas y Telemática Vol. 9 No. 18
URI permanente para esta colecciónhttp://hdl.handle.net/10906/5652
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Ítem Metodología ágil para equipos pequeños usando plataformas Microsoft(Universidad Icesi, 2011-09-30) Arboleda Jiménez, Hugo Fernando; Paz Loboguerrero, Andrés Felipe; Castañeda Bueno, LorenaAiming to improve the performance of software development teams, many development methodologies have been defined; among which are the prescriptive and agile. Despite this, teams do not usually use any of these by not finding them tailored to their particular context, and instead go directly to the task of programming. This article proposes a light software development methodology adapted to a precise and well-defined context, aligning Microsoft Solutions Framework for Agile Software Development (MSF4ASD) with the project management guidelines presented in the PMBOK Guide. In addition, it offers elements for the implementation of a Microsoft team software development platform to support it.Ítem Modelos de propagación radio para redes de TDT móvil en la banda UHF(Universidad Icesi, 2011-09-30) Giménez Gandia, Jordi Johan; Cardona Marcet, Narcís; Gómez Barquero, David; López Sánchez, JaimeThis article studies the suitability of different radio propagation models for the deployment of mobile TV networks over the UHF band. Accurate signal propagation modelling is key for mobile DTT network planning in order to minimize deployment costs. This article analyzes four propagation models: Okumura- Hata, Xia-Bertoni, a model based on the Hata formulae adding a diffraction term calculated using the Deygout method and COST 231 Walfisch-Ikegami model. The performance of the models is evaluated with measurement campaigns from several scenarios with different conditions such as transmitter height, environment, and available geographical data. Finally, location variability is studied as a key parameter to achieve an efficient network dimensioning.Ítem On Designing Self-Adaptive Software Systems(Universidad Icesi, 2011-09-30) Tamura Morimitsu, Gabriel; Villegas Machado, Norha Milena; Müller, Hausi A.Self-adaptive systems modify themselves at run-time in order to control the satisfaction of their requirements under changing environmental conditions. Over the past century, feedback-loops have been used as important models for controlling dynamic behavior of mechanical, electrical, fluid and chemical systems in the corresponding fields of engineering. More recently, they also have been adopted for engineering self-adaptive software systems. However, obtaining sound and explicit mappings consistently between adaptive software architectures and feedback loop elements is still an open challenge. This paper, recalling a reference model proposed previously with that goal, discuss key aspects on the design of adaptive software where feedback loop elements are explicitly defined as first-class components in its software architecture. It complements this discussion with an illustration of the process to use this reference model by applying it to a plausible adaptive software example. This paper aims at providing a reference starting point to support software engineers in the process of designing self-adaptive software systems.Ítem Smart Grid: Las TICs y la modernización de las redes de energía eléctrica - Estado del Arte(Universidad Icesi, 2011-09-30) Díaz Andrade, Carlos Andres; Hernández, Juan CarlosIn the world is growing interest in developing policies and regulations that encourage the creation of social awareness of greenhouse gas emissions. Many governments also want to reduce dependence on fossil fuels. Called Smart Grid technologies can support these goals by reducing carbon emissions by managing energy demand. In addition to environmental benefits, its implementation improves the efficiency of transmission and power distribution, and allows the integration of distributed renewable energy sources. The infrastructure of the Smart Grid should provide future requirements and take advantage of emerging technologies. With the mass use of electric vehicles, the network must be able to respond to the enormous increase in demand. These actions are important in many sectors, but particularly for ICT, as their development is to enable power grids to become "smarter".Ítem Vol. 9 No. 18, Julio/Diciembre 2011 / SISTEMAS & TELEMATICA(Universidad Icesi, 2011-09-30) Universidad IcesiContiene: Investigación científica y tecnológica : On Designing Self-Adaptive Software Systems // Villegas Machado, Norha Milena ; Müller, Hausi A. ; Tamura Morimitsu, Gabriel / p. 29-51 -- Smart Grid : Las TICs y la modernización de las redes de energía eléctrica - Estado del Arte // Díaz Andrade, Carlos Andres ; Hernández Delgado, Juan Carlos / p. 53-81 -- Metodología Ágil para equipos pequeños usando plataformas Microsoft // Paz Loboguerrero, Andrés Felipe ; Castañeda Bueno, Lorena ; Arboleda Jiménez, Hugo Fernando / p.83-99 -- Modelos de propagación radio para redes de TDT móvil en la banda UHF // Giménez Gandia, Jordi Johan ; López Sánchez, Jaime ; Gómez Barquero, David ; Cardona Marcet, Narcís / p.9-27 -- Reseña bibliográfica: Reseña bibliográfica: La tierra se agota (Lovelock, J) // Andrés López Astudillo / p.101-103