Repositorio Institucional ITBA
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Statistical properties of the entropy from ordinal patterns
No full text"The ultimate purpose of the statistical analysis of ordinal patterns is to characterize the distribution of the features they induce. In particular, knowing the joint distribution of the pair entropy-statistical complexity for a large class of time series models would allow statistical tests that are unavailable to date. Working in this direction, we characterize the asymptotic distribution of the empirical Shannon’s entropy for any model under which the true normalized entropy is neither zero nor one. We obtain the asymptotic distribution from the central limit theorem (assuming large time series), the multivariate delta method, and a third-order correction of its mean value. We discuss the applicability of other results (exact, first-, and second-order corrections) regarding their accuracy and numerical stability. Within a general framework for building test statistics about Shannon’s entropy, we present a bilateral test that verifies if there is enough evidence to reject the hypothesis that two signals produce ordinal patterns with the same Shannon’s entropy. We applied this bilateral test to the daily maximum temperature time series from three cities (Dublin, Edinburgh, and Miami) and obtained sensible results.
Diagnóstico y plan de acción sobre McQueen SRL
Get PDF"La empresa McQueen SRL se dedica al transporte de paquetería, cargas y encomiendas, especializándose en el tramo Rosario-Buenos Aires. Con información que recopilamos de Internet, además de entrevistas que tuvimos con la empresa e información que nos enviaron vía email, pudimos hacer una primera etapa de relevamiento, seguido por un diagnóstico de los puntos a mejorar y un plan de acción. Según lo que pudimos observar de la empresa, todos los aspectos a mejorar podían englobarse bajo un problema de rentabilidad. En base a la criticidad de los problemas, su urgencia y la facilidad de todas las soluciones que planteamos; definimos qué 4 soluciones clave a implementar, en conjunto con planes de implementación, KPIs, y una valuación económica de cada una de ellas."Trabajo Final Licenciatura en Administración y Sistemas (grado) - Instituto Tecnológico de Buenos Aires, Buenos Aires, 202
Evaluación de caso de negocio para la producción y comercialización de fábricas transportables de leche en polvo
Get PDF"El siguiente trabajo evalúa la viabilidad de elaborar fábricas transportables de leche en polvo. Al observar distintas noticias a lo largo de los últimos años, donde camiones cisterna que transportaban leche vaciaron su contenido a la vera de una ruta rural, generaron en el autor distintos cuestionamientos: ¿cómo es posible que un alimento que cuesta tanto trabajo producir y transportar, se derroche de esta manera? ¿La solución es derramar la producción ya que el valor de la leche es menor que el costo de transportarla?"Tesis en Dirección Estratégica y Tecnológica (maestría) - Instituto Tecnológico de Buenos Aires, Buenos Aires, 2022Tesis en Dirección Estratégica y Tecnológica (maestría) - Instituto Tecnológico de Buenos Aires, Buenos Aires, 202
Desarrollo de algoritmo para asistencia al diagnóstico diferencial de Alzheimer y demencia fronto-temporal
No full textEl objetivo del presente proyecto consiste en "crear un algoritmo de ML que emplee datos multivariados de pruebas cognitivas
y de imágenes, para poder asistir al diagnóstico diferencial de las demencias de tipo Alzheimer y fronto-temporal."Proyecto final Bioingeniería (grado) - Instituto Tecnológico de Buenos Aires, Buenos Aires, 202
Physical distance characterization using pedestrian dynamics simulation
No full textIn the present work we study how the number of simulated customers (occupancy) af-fects social distance in an ideal supermarket, considering realistic typical dimensions and processing times (product selection and checkout). From the simulated trajectories we measure social distance events of less than 2 m, and their duration. Among other observ-ables, we define a physical distance coefficient that informs how many events (of a given duration) each agent experiences
Dopamine neurotransmission in the VTA regulates aversive memory formation and persistence
No full text"Dopamine (DA) neurons in the ventral tegmental area (VTA) innervating several limbic and neocortical regions of the mammalian brain have long been implicated in motivation, rewarding and aversive behaviors, and memory processing. Recently, we demonstrated that somatodendritic release of DA in the VTA regulates the formation and maintenance of appetitive long-term memories (LTM). However, less is known about the impact of DA neurotransmission in the VTA on aversive LTM. Here, we describe the modulation of negative-valence memories by D1/D5-type DA (D1R)-receptor-mediated neurotransmission in the VTA. As aversive stimuli elicit both active and passive behavioral responses, we used two single-trial aversive training protocols: inhibitory avoidance task and conditioned place aversion. We bilaterally microinfused SCH23390, an antagonist of D1R, into the VTA immediately after training and found that DA neurotransmission in the VTA modulates LTM consolidation and persistence of aversive experiences. Together with previous findings demonstrating that D1R mediated DA neurotransmission in the medial prefrontal cortex and hippocampus is involved in the formation and persistence of LTM for aversive events, our present results indicate that memory processing of environmental stimuli with negative-valence depends on the integration of information mediated by D1R activation in both the VTA region and in selected downstream target areas.
Experimental examination of the MoNiKa-ORC-Turbine and comparison of the results with thermodynamical calculation
No full textThe aim of this work is to understand the propane turbine behaviour located at MoNiKa facility in Campus North (KIT). Starting with the thermodynamic simulations, continuing with the selection of different load points to evaluate them experimentally on site and ending with the data analysis to finally reach the correction of the Stodola’s law equation and the turbine efficiency correction. The simulations were performed using GESI software developed in MATLAB® by ITES, and in addition, to perform these simulations, all the calculations of the thermodynamic properties were performed with the REFPROP software, NIST fluid properties database. The working medium of this work is either propane or a mixture between propane and nitrogen. The runs were carried out at the beginning of November 2021, where different types of assays were performed, previously analysed in GESI. First a test of different turbine load points was performed, the following day the response of the turbine was evaluated by progressively opening the turbine control valve and, the last day, another sensitivity test was performed, but this time the turbine was evaluated with the response of a progressive increase of the mass flow rate through the turbine. Stodola's equation provides a calculation method for the highly nonlinear dependence of the turbine inlet pressure with a flow for a multistage turbine with high backpressure. From its correction we find its
behavior for this turbine. In turn, we sought to understand the dependence of the turbine efficiency, and an equation that solves it within certain boundary conditions. The current experiment performed during winter semester 2021/2022 and is the continuous work of previous thesis and experiments at the facility. Each test performed in MoNiKa brings the possibility to increase the know-how of the facility and optimize the performance of a Binary ORCs (supercritical organic Rankine cycle) power plant with a low temperature geothermal heat source
Spontaneous and induced out-of-body experiences during sleep paralysis: Emotions, “AURA” recognition, and clinical implications
No full text"Sleep paralysis is characterized by the incapacity to perform voluntary movements during sleep/wake transitions, and could bring great discomfort. During sleep paraly sis, out-of-body experiences can occur. Out-of-body experiences refers to the sensation of being outside of the physical body and perceiving the world from this outside perspective; however, they are pleasant in comparison with other sleep paralysis hallucinations. Lucid dreams are dreams in which a subject becomes aware of being dreaming while the dream occurs. Here, we designed an online survey to study the predominant and specific emotions during sleep paralysis and/or out-of-body experience events as well as the somatosensory perceptions that preceded their occurrence. The sample (N = 329) was divided into experimental groups depending on the presence/absence of out-of-body experiences, capacity to induce (or not) out-of body experiences, and perception/no-perception of the sleep paralysis. We showed that more positive emotions were associated with out-of-body experiences and more
negative emotions were associated with sleep paralysis episodes, and for those who claim the ability to induce out-of-body experiences, positive emotions were more frequent in their episodes. We found that subjects perceived auditory, tactile and visual sensations before sleep paralysis episodes, and we proposed that these could be an
“aura” of sleep paralysis. Furthermore, subjects that had out-of-body experiences but had never felt the sleep paralysis, perceived tactile and visual sensations to the
same extent as subjects with out-of-body experiences that felt the sleep paralysis."
Therefore, we proposed that the “aura” recognition could be used under controlled
conditions for out-of-body experiences induction in patients with sleep paralysis to
diminish the negative symptoms associated with sleep paralysis episode
Optimización de la movilidad y miscibilidad de CO2 para EOR y almacenamiento de dióxido de carbono en reservorios heterogéneos
No full text"El CO2 EOR es una opción de CCUS con una capacidad de mitigación de CO2 excepcional y que contribuye a la soberanía energética. Esta tecnología tiene tres limitaciones para su implementación: la captura de CO2 en las condiciones técnicas y económicas necesarias, la baja viscosidad del gas y las elevadas presiones de miscibilidad. Este trabajo tiene un enfoque integral en el cual se busca ofrecer soluciones a cada una de estas limitaciones."Tesis Ingeniería (doctorado) - Instituto Tecnológico de Buenos Aires, Buenos Aires, 202
Model-based control design for H2 purity regulation in high-pressure alkaline electrolyzers
No full text"This paper proposes two control strategies that mitigate the cross contamination of H2 and O2 in a high-pressure alkaline electrolyzer, which consequently increases the supplied gases purity: one based on a decoupled PI scheme and the other based on optimal control tools. In order to reduce the diffusion of gases through the membrane, the controllers establish the opening of two outlet valves based on the pressure of the system and the difference in liquid level between both separation chambers. Therefore, two multiple input - multiple output controllers are designed here. For this purpose, a high-fidelity model previously developed was simplified in order to obtain a control-oriented model. The proposed controllers were evaluated in simulation using the high-fidelity nonlinear model in a wide operating range, which resulted in less than 1% impurity of gases.