Examinando por Autor "Peña-Palacio, J. A. (Juan Alejandro)"

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    Analyzing inflation: Measurement problems and trends
    (2014-05-15) Ardila-Restrepo, H. J. (Hermilson de Jesús); Lochmüller, C. (Christian); Peña-Palacio, J. A. (Juan Alejandro)
    As a consequence of the crisis of 2007/2008, which started in the United States of America within the financial sector and which then spread to the real sector, the governments of several countries had to bail out financial institutions and companies. Central banks, especially in the U.S. and Europe injected liquidity in large volumes into the markets in order to stabilize the financial sector, a process which might produce higher inflation. This article discusses how inflation is measured and found that the measurement does not include adequately the development of prices of financial assets. Furthermore, it discussed that money supply should include loans, as credit serves as money and has an impact on inflation. One of the main conclusions is that there is a real possibility that inflation rates will increase in the medium term future.
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    Estimación de modelos lineales para el control predictivo de pequeñas centrales hidroeléctricas
    (2014-05-14) Estrada-Viana, I. D. (Iván Darío); Peña-Palacio, J. A. (Juan Alejandro); Guarnizo-Lemus, C. (Cristian)
    This paper presents the modeling of a Small Hydroelectric Plant (PCH), by obtaining linear prediction models. The mathematical model of the system, provides all your hydraulic system, which runs from the reservoir tank, through the tunnel for the transport of water resources, load lines, up to the generation units. Subsequently, the system proceeds to modeling, using a set of prediction models like ARX models, ARMA X, Box-Jenkins and Output Error (OE). The results obtained for each of the above models were evaluated versus nonlinear dynamic model that represents the dynamic behavior of the system. This evaluation was based on error analysis and according to the performance index of each model. Thus, the best results were obtained by the OE model as this shows a direct way as the error may affect the system output. Finally, the development of this model can be used in the implementation of predictive controllers for load distribution (power generation) in Small Hydroelectric Plant, based on the conditions of water availability in the reservoir tank.
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    El Riesgo del endeudamiento: La Crisis de la Deuda Soberana y posibles implicaciones
    (2014-05-14) Ardila-Restrepo, H. J. (Hermilson de Jesús); Lochmüller, C. (Christian); Peña-Palacio, J. A. (Juan Alejandro); Márquez-Godoy, J. I. (Jose Ignacio)
    Due to the global financial crisis unleashed between 2007 and 2008 and which quickly spread to the real sector, many governments did come out to rescue banks, significantly increasing their debt levels and, in particular, debt sovereign. Thus, many countries have reached unsustainable levels of debt, so that central banks injected liquidity to markets and expanded its balance sheet to buy assets of countries and companies in crisis, in order to ensure the smooth functioning of financial system. That is why in this article provides an analysis of the levels of borrowing countries as a result of this process, and presents a series of reflections about the impacts and the consequences that these may have in the short and medium term, especially in predicting the magnitude of these impacts.
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    Traducción automática del lenguaje dactilológico de sordos y sordomudos mediante sistemas adaptativos
    (2014-05-05) Betancur-Betancur, D. (Daniel); Vélez-Gómez, M. (Mateo); Peña-Palacio, J. A. (Juan Alejandro)
    One of the main limitations of the people with hearing impairment is directly related to their difficulty interacting with others, either verbally or through auxiliary systems based on voice and audio. This paper presents the development of an integrated system of hardware and software for automatic fingerspelling sign language used by people with this type of disability. The hardware system comprises a glove which has a set of wireless sensors that capture a series of signals generated by the hand gestures, and a adaptive model based on the principles of neural computation, that allows recognition of a particular dactilologic language. Results from the integrated system showed great effectiveness in recognizing vowels from the dactilologic Spanish language. This recognition was influenced by the dimensionality reduction made by the neural model of the input signals representing movements, and the sensitivity factor that sets the limit between recognition and learning.