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Ítem Some comparison between propagation models in Cost 2100 Cali Reference Scenario(Universidad Icesi, 2009-08-18T20:25:14Z) Ardila, Carlos Andredy; Mejía Mateus, Duván Javier; Navarro Cadavid, AndrésIn this paper we present results from traditional propagation models like Hata and Walfish Bertoni, implemented in our planning tool, and compare it with results obtained from a commercial tool and also with measurements provided by a local operator. For this experiment, we use the Cost 2100 Cali Reference Scenario.Ítem Ajuste estadístico de modelos de propagación de señal usando medidas de la ciudad de Cali(Universidad de Santiago de Cali,, 2012-03-20) Ardila, Carlos AndredyLa dificultad de estimar con exactitud la influencia de los obstáculos, los edificios y el terreno en la pérdida de trayectoria de la señal hace que los modelos de propagación, generalmente utilizados para la planificación de redes inalámbricas externas, en entornos urbanos incluyan algunos elementos empíricos. Por lo tanto, la ecuación final generalmente contiene constantes y coeficientes para los diferentes términos, que se obtienen principalmente a partir del análisis estadístico de mediciones recolectadas durante actividades de drive test en grandes áreas de la ciudad. Desafortunadamente, estos resultados son realmente válidos únicamente para las áreas de la ciudad en las que se obtuvieron y, en el mejor de los casos, para áreas o ciudades similares. Sin embargo, si el nivel de similitud no es suficiente, es necesario realizar ajustes, un proceso que resulta en la formulación de nuevas constantes y nuevos coeficientes. El propósito de este artículo es discutir algunos de los hallazgos obtenidos durante el proceso de ajuste estadístico al escenario de la ciudad de Cali, de los modelos Okumura-Hata, Stanford University Interim (SUI) y Walfisch-Bertoni, usando mediciones.Ítem Statistical adjustment of empirical propagation path loss models to the COST 2100 Cali reference scenario(Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE, 2012-11-12) Navarro Cadavid, AndrésPropagation models used to plan outdoor wireless networks on urban environment, tend to include a high degree of empirical component. These are derived from the difficulties of accurately estimate the influence of obstacles, buildings and terrain in the signal path loss. Therefore, the final equation usually contains constants, and coefficients for the different terms, mainly obtained by statistical analysis of measurement sets, collected during drive tests on large areas of the city. Unfortunately, such results are only truly valid for the city or parts of the city on which the measurements were taken. They can also be considered appropriate for similar areas or cities at the most. If the areas are not similar enough however, a process of adjustment is necessary, leading to the finding of new constants and coefficients. The purpose of this paper is to discuss some of the findings during the process of statistically adjust the Okumura-Hata and Walfisch-Bertoni models to the Cali scenario, using measurements.Ítem Panorama de gestión cuantitativa de procesos de desarrollo de software en pequeñas organizaciones(Universidad Icesi, 2013-07-01) Ardila, Carlos Andredy; Pino, Francisco J. ,In the software industry, small entities are majority, and is important that incorporate them quantitative processes management practices for to reduce processes variability. CMMI-DEV and ISO/IEC 15504-5 address quantitative management, but are for big organizations. MoProSoft, COMPETISOFT and MPS.BR are for the small enterprises, but not include quantitative management. Through a systematic review of literature, searched for works about quantitative process management for small software developing enterprises indicating what practices do and how to execute. As conclusion, there is not available an integrated proposal that incorporate management practices quantitative of software processes for this kind of organizations.Ítem Digital television networks over DVB-T2: Example of an interactive ecological game in Colombia(International Telecommunication Union, 2013-01-01) Ardila, Carlos AndredyThe development and deployment of interactive applications is an important aspect of the adoption of digital television in Colombia. It opens up possibilities not just for entertainment and commercial purposes, but also for education, political participation, cultural inclusion and other aspects of well-being. For decades, broadcast television has been the primary source of information and entertainment for most people in Colombia. According to a recent quality of life survey, 91 per cent of Colombian homes possess one or more colour television devices. Television can reach remote areas, some of them important in terms of bio-diversity where the inhabitants tend to be unaware of the need to preserve valuable ecosystems.