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Browsing Doctorados by Subject "600"
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Item Desarrollo de materiales modificadores de propiedades eléctricas de los elementos aislantes poliméricos vinílicos basados en tecnologías de Nanoescala.(Universidad Antonio Nariño) Tarazona Saldarriaga, Paola; Camargo, Manuel; Reyes Guzmán, Edwin AlfredoThe main objective of this research work was to evaluate the impact of the synthesized additives, through nanotechnology, in the electrical properties of the PVC to improve its insulator behavior in order to obtain a plastic coating that withstand long exposure times to unfavorable environments. Modified nanoparticles were synthesized using surface engineering with silica, aluminum and magnesium-base compounds along with organic acids and evaluated in an insulating coating formula for electrical cables with an operating temperature of 105 °C. In the experimental research, the nanoadditive was added to the thermal stabilizer used in the manufacturing of PVC compound and the nanoadditive concentration was posed taking into account the economic and performance impact on the final product, seeking for an increase below 0.3 USD per kilogram in the thermal stabilizer cost. The compound was used to manufacture flat PVC plates used for the performance and accelerated aging tests. Properties like color, hardness and volume resistivity before and after water absorption were evaluated. Finally, there were 3 successful prototypes obtained along with its economical analysis and its impact on the stabilizer cost and a proposal for the implementation of the process at an industrial level in Carboquimica.Item Herramienta para predecir el riesgo por exposición a radiaciones ionizantes en trabajadores del sector de la salud utilizando técnicas de Machine Learning(Universidad Antonio Nariño) Rincón Arévalo, Guido Marcelo; Sánchez Camargo, Claudia Liliana; Rodríguez Suarez, César AugustoExposure to ionizing radiation induces biological changes that can trigger high-cost or catastrophic diseases in those who handle them, these changes are not immediate, they can take time to appear and additionally these diseases have diverse factors, however, the quantification of ionizing radiation, hazard analysis and radiation weighting manage to categorize risks and prevent them from materializing. Health institutions must comply with scattered radiation measures that can be absorbed by workers while performing the medical act or in the environment where they perform their functions. These measurements are made with equipment such as dosimeters to have a monthly surveillance and to know the exposure values of the workers. This research uses the results of the measurement of the worker and the work environment and performs a risk categorization with the results obtained from health institutions. With the use of Machine Learning, the risk of absorbed and dispersed radiation in the work environment is weighted and with these values it is possible to design a tool that allows knowing and predicting the risk of exposure in which a worker is occupationally exposed.Item Sistema y método para la interpretación de la imaginación motora de los movimientos de ponerse de pie y sentarse basado en interfaz cerebro computadora(Universidad Antonio Nariño) Triana Guzmán, Nayid; Jutinico Alarcón, Andrés Leonardo; Orjuela Cañón, Álvaro David; Reyes Guzmán, Edwin AlfredoBrain-computer interface (BCI) systems based on electroencephalography (EEG) and motor imagination (MI), have shown promising advances for the motor rehabilitation of lower extremities. However, in the state of the art there has been little explored about the MR of the lower limb, especially little is known about MR for standing and sitting. By Therefore, this paper presents an EEG-based ICC system for MI interpretation of these types of movements. The purpose of this system is to restore some mobility to people with disorders severe neuromuscular disorders that cannot exert the force required to move the physical interface (mouse, keyboard, joystick, microphone, or other peripherals) that use standing devices to perform transition from sitting to bipedal position