La obesidad y el Sindrome Metabolico (SM) se han convertido en patologias epidemicas en el ambito... more La obesidad y el Sindrome Metabolico (SM) se han convertido en patologias epidemicas en el ambito mundial. Sin embargo, no existen estudios regionales que evaluen estas entidades en el entorno laboral, por lo que el motivo de este trabajo fue determinar su comportamiento en trabajadores de turno fijo y rotatorio en una empresa del estado Lara-Venezuela. Materiales y Metodos: Se realizo un estudio de campo, transversal y analitico en 230 individuos seleccionados al azar, pertenecientes al personal operativo (de turno rotatorio y fijo) que labora dentro de los comedores industriales de la empresa Sercoinfal CA. Se aplico un modelo de regresion logistica para estudiar la relacion entre el diagnostico o no de SM como variable dependiente, y el sexo, edad, turnos rotatorio/fijo y cargos de trabajo como variables independientes. Resultados : La prevalencia de sobrepeso y obesidad en la muestra estudiada fue del 48,3% y 30,4% respectivamente. El grupo de turno fijo mostro una prevalencia d...
We use a laboratory experiment to study the impact of transparency on reducing corruption in cont... more We use a laboratory experiment to study the impact of transparency on reducing corruption in contexts where embezzlement and bribery can co-occur. These contexts are closely related to grand corruption settings, where different types of corruption occur and allow people in power to take advantage of their position. Transparency is expected to have a positive effect on reducing corruption. However, our results show that transparency decreases embezzlement by roughly ten percentage points, while it has no significant effect on bribery. The observed differential impact of transparency could be attributed to strategic lying by the resource manager, who acts as if low public investment rates were a consequence of bad luck (low budget) instead of misappropriation. This suggests that the impact of transparency cannot be generalized to all types of corruption when different types co-exist.
Air pollution has been an environmental and health problem in the world, several methods of multi... more Air pollution has been an environmental and health problem in the world, several methods of multivariable linear regression has been proposed to determine levels of association and dependence between air pollutants and meteorological parameters. These parameters are characterized by redundant and irrelevant information, which is detrimental to a regression model. In this context a dependence analysis using Multiple Linear Regression and Principal Component Regression in air pollutants and meteorological parameters was developed, found a strong correlation between ozone and temperature (0.8) for Tlalnepantla station, as well as a determination coefficient of 82%. The PCR model proved that meteorological parameter such as temperature and relative humidity have a significant impact on the air pollution in Mexico City
La infección de vías urinarias (IVU) es una patología común, que afecta a gran parte de la poblac... more La infección de vías urinarias (IVU) es una patología común, que afecta a gran parte de la población y que generalmente se resuelve con manejo antibiótico. Se compone de una amplia variedad de entidades clínicas que pueden variar desde una cistitis no complicada hasta un shock séptico de origen urinario. Los patógenos etiológicos de la IVU no complicada están ampliamente establecidos y se han mantenido de forma consistente a lo largo del tiempo, siendo la Escherichia coli el microorganismo más predominante. En la actualidad, la resistencia bacteriana a los antibióticos es de gran preocupación y por esa razón, se busca optimizar la terapia antimicrobiana con el fin de disminuir la estancia hospitalaria, la severidad clínica de la infección y los costos a los sistemas de salud. La presente revisión, tiene como objetivo servir como guía para la correcta definición, clasificación, diagnóstico, tratamiento y prevención de la IVU no complicada.
"Este trabajo evalua si las transformaciones de potencia (Box-Cox y en particular logaritmic... more "Este trabajo evalua si las transformaciones de potencia (Box-Cox y en particular logaritmica) de series de tiempo mejoran la precision de los pronosticos de modelos ARIMA ajustados a variables economicas de Colombia en dos periodos diferentes: 1980-1995 y 2002-2012. Se compara la habilidad predictiva de series en nivel y series transformadas a traves de un experimento fuera de muestra mediante el uso de la prueba de habilidad predictiva incondicional de Giacomini y White (2006). Se encuentra que los pronosticos de las series transformadas, en general, se desempenan mejor para el periodo 1980-1995, cuando la economia colombiana fue relativamente mas volatil que durante el periodo 2002-2012. Para este ultimo tramo de la muestra, los resultados son mixtos y para algunas series se sugiere mantenerlas en niveles, es decir, sin utilizar transformaciones de potencia."
Journal of Economic Behavior & Organization, 2021
Abstract Experimental participants in a cheating game draw a random number and then report any nu... more Abstract Experimental participants in a cheating game draw a random number and then report any number they wish, receiving a monetary payoff based only on the report. We study how these reports depend on the level of observability of both the random draw and the report by the experimenter. Our results show that whereas increasing the observability of the random draw decreases cheating, increasing the anonymity of the reports does not affect average reports.
This paper experimentally investigates the impact of suggestive messages and tipping on a third p... more This paper experimentally investigates the impact of suggestive messages and tipping on a third party’s judgment. The experimental design uses a model with three players, wherein two players (A and B) create a joint project, and the third player (C) decides how to divide the project’s earnings between the first two players. In two treatments, player B has an opportunity to influence player C’s decision via a numeric message or an ex-post tip. The main finding of this paper is that giving player B the option to suggest a specific amount to the allocator does not increase his share. In contrast, when player C knows that player B can send him a tip, the share awarded to player B increases.
We study the effect of entitlement on the willingness to lie. We set up a model of lying where in... more We study the effect of entitlement on the willingness to lie. We set up a model of lying where individuals feel more or less entitled to their endowment depending on how they earned it. When given the opportunity to lie to keep their endowment, individuals who feel more entitled are encouraged to lie while others are discouraged. To test the model predictions we use a laboratory experiment where we compare the lying behavior of participants endowed with a high endowment and participants endowed with a low endowment. In one treatment, the allocation of the endowment is decided by participants' performance, and in the other, it is determined by a random draw. Our study identifies that deservingness influences lying in an intuitive direction: when participants’ performance determines income, those who earn less money lie less than those who earn more. We do not find differences in lying when participants perform the same task but lie to keep windfall endowments.
We consider the Dirichlet Laplacian in a three-dimensional waveguide that is a small deformation ... more We consider the Dirichlet Laplacian in a three-dimensional waveguide that is a small deformation of a periodically twisted tube. The deformation is given by a bending and an additional twisting of the tube, both parametrized by a coupling constant δ. We expand the resolvent of the perturbed operator near the bottom of its essential spectrum and we show the existence of exactly one resonance, in the asymptotic regime of δ small. We are able to perform the asymptotic expansion of the resonance in δ, which in particular permits us to give a quantitative geometric criterion for the existence of a discrete eigenvalue below the essential spectrum. In the particular case of perturbations of straight tubes, we are able to show the existence of resonances not only near the bottom of the essential spectrum but near each threshold in the spectrum. We also obtain the asymptotic behavior of the resonances in this situation, which is generically different from the first case.
Yes it does ! Indeed an extended version of Levinson's theorem is proposed for a system involving... more Yes it does ! Indeed an extended version of Levinson's theorem is proposed for a system involving complex eigenvalues. The perturbed system corresponds to a realization of the Schrödinger operator with inverse square potential on the half-line, while the Dirichlet Laplacian on the half-line is chosen for the reference system. The resulting relation is an equality between the number of eigenvalues of the perturbed system and the winding number of the scattering system together with additional operators living at 0-energy and at infinite energy.
Abu Dhabi International Petroleum Exhibition & Conference, 2018
The formation evaluation of low-porosity tight gas reservoirs in Argentina presents several well-... more The formation evaluation of low-porosity tight gas reservoirs in Argentina presents several well-known challenges in the estimation of main petrophysical properties as porosity, clay fraction, permeability, and water saturation. The main goal is to accurately quantify these petrophysical properties with a consistent and reliable petrophysical model. The next task is to reveal the key petrophysical responses that represent the link between petrophysics and production. The present work describes the main petrophysical challenges faced and an innovative workflow used in the Lindero Atravesado field with clear examples to illustrate the effectiveness of this approach. The workflow involves measurements such as advanced elemental gamma ray spectroscopy, multifrequency dielectric dispersion, and nuclear magnetic resonance (NMR). The advanced elemental gamma ray spectroscopy has been key for the creation of a robust mineralogical model, and to derive the matrix properties used to obtain an...
Geriatrie et psychologie neuropsychiatrie du vieillissement, 2017
Olders patients are exposed to iatrogenic risk as they are often frail, with multiple pathologies... more Olders patients are exposed to iatrogenic risk as they are often frail, with multiple pathologies and therefore polymedicated. The objective of this study was to evaluate the knowledge of treatment in the elderly before and after a time of oral therapeutic education accompanied by the submission of a written educational support. The impact of that education on the adhesion was also evaluated. We've included patients aged at least 75 years old, living at home, and managing themselves their treatment. At study entry, patients were evaluated by their regular physician about knowledge and compliance of their treatment and were receiving therapeutic education time. Three months later, knowledge and adherence to treatment were re-evaluated by the treating physician during an interview. The adhesion was evaluated using the Morisky score. 89 subjects were enrolled between May and October 2015. The average age was 81.9 years old and most patients were autonomous. We observed an improveme...
La obesidad y el Sindrome Metabolico (SM) se han convertido en patologias epidemicas en el ambito... more La obesidad y el Sindrome Metabolico (SM) se han convertido en patologias epidemicas en el ambito mundial. Sin embargo, no existen estudios regionales que evaluen estas entidades en el entorno laboral, por lo que el motivo de este trabajo fue determinar su comportamiento en trabajadores de turno fijo y rotatorio en una empresa del estado Lara-Venezuela. Materiales y Metodos: Se realizo un estudio de campo, transversal y analitico en 230 individuos seleccionados al azar, pertenecientes al personal operativo (de turno rotatorio y fijo) que labora dentro de los comedores industriales de la empresa Sercoinfal CA. Se aplico un modelo de regresion logistica para estudiar la relacion entre el diagnostico o no de SM como variable dependiente, y el sexo, edad, turnos rotatorio/fijo y cargos de trabajo como variables independientes. Resultados : La prevalencia de sobrepeso y obesidad en la muestra estudiada fue del 48,3% y 30,4% respectivamente. El grupo de turno fijo mostro una prevalencia d...
We use a laboratory experiment to study the impact of transparency on reducing corruption in cont... more We use a laboratory experiment to study the impact of transparency on reducing corruption in contexts where embezzlement and bribery can co-occur. These contexts are closely related to grand corruption settings, where different types of corruption occur and allow people in power to take advantage of their position. Transparency is expected to have a positive effect on reducing corruption. However, our results show that transparency decreases embezzlement by roughly ten percentage points, while it has no significant effect on bribery. The observed differential impact of transparency could be attributed to strategic lying by the resource manager, who acts as if low public investment rates were a consequence of bad luck (low budget) instead of misappropriation. This suggests that the impact of transparency cannot be generalized to all types of corruption when different types co-exist.
Air pollution has been an environmental and health problem in the world, several methods of multi... more Air pollution has been an environmental and health problem in the world, several methods of multivariable linear regression has been proposed to determine levels of association and dependence between air pollutants and meteorological parameters. These parameters are characterized by redundant and irrelevant information, which is detrimental to a regression model. In this context a dependence analysis using Multiple Linear Regression and Principal Component Regression in air pollutants and meteorological parameters was developed, found a strong correlation between ozone and temperature (0.8) for Tlalnepantla station, as well as a determination coefficient of 82%. The PCR model proved that meteorological parameter such as temperature and relative humidity have a significant impact on the air pollution in Mexico City
La infección de vías urinarias (IVU) es una patología común, que afecta a gran parte de la poblac... more La infección de vías urinarias (IVU) es una patología común, que afecta a gran parte de la población y que generalmente se resuelve con manejo antibiótico. Se compone de una amplia variedad de entidades clínicas que pueden variar desde una cistitis no complicada hasta un shock séptico de origen urinario. Los patógenos etiológicos de la IVU no complicada están ampliamente establecidos y se han mantenido de forma consistente a lo largo del tiempo, siendo la Escherichia coli el microorganismo más predominante. En la actualidad, la resistencia bacteriana a los antibióticos es de gran preocupación y por esa razón, se busca optimizar la terapia antimicrobiana con el fin de disminuir la estancia hospitalaria, la severidad clínica de la infección y los costos a los sistemas de salud. La presente revisión, tiene como objetivo servir como guía para la correcta definición, clasificación, diagnóstico, tratamiento y prevención de la IVU no complicada.
"Este trabajo evalua si las transformaciones de potencia (Box-Cox y en particular logaritmic... more "Este trabajo evalua si las transformaciones de potencia (Box-Cox y en particular logaritmica) de series de tiempo mejoran la precision de los pronosticos de modelos ARIMA ajustados a variables economicas de Colombia en dos periodos diferentes: 1980-1995 y 2002-2012. Se compara la habilidad predictiva de series en nivel y series transformadas a traves de un experimento fuera de muestra mediante el uso de la prueba de habilidad predictiva incondicional de Giacomini y White (2006). Se encuentra que los pronosticos de las series transformadas, en general, se desempenan mejor para el periodo 1980-1995, cuando la economia colombiana fue relativamente mas volatil que durante el periodo 2002-2012. Para este ultimo tramo de la muestra, los resultados son mixtos y para algunas series se sugiere mantenerlas en niveles, es decir, sin utilizar transformaciones de potencia."
Journal of Economic Behavior & Organization, 2021
Abstract Experimental participants in a cheating game draw a random number and then report any nu... more Abstract Experimental participants in a cheating game draw a random number and then report any number they wish, receiving a monetary payoff based only on the report. We study how these reports depend on the level of observability of both the random draw and the report by the experimenter. Our results show that whereas increasing the observability of the random draw decreases cheating, increasing the anonymity of the reports does not affect average reports.
This paper experimentally investigates the impact of suggestive messages and tipping on a third p... more This paper experimentally investigates the impact of suggestive messages and tipping on a third party’s judgment. The experimental design uses a model with three players, wherein two players (A and B) create a joint project, and the third player (C) decides how to divide the project’s earnings between the first two players. In two treatments, player B has an opportunity to influence player C’s decision via a numeric message or an ex-post tip. The main finding of this paper is that giving player B the option to suggest a specific amount to the allocator does not increase his share. In contrast, when player C knows that player B can send him a tip, the share awarded to player B increases.
We study the effect of entitlement on the willingness to lie. We set up a model of lying where in... more We study the effect of entitlement on the willingness to lie. We set up a model of lying where individuals feel more or less entitled to their endowment depending on how they earned it. When given the opportunity to lie to keep their endowment, individuals who feel more entitled are encouraged to lie while others are discouraged. To test the model predictions we use a laboratory experiment where we compare the lying behavior of participants endowed with a high endowment and participants endowed with a low endowment. In one treatment, the allocation of the endowment is decided by participants' performance, and in the other, it is determined by a random draw. Our study identifies that deservingness influences lying in an intuitive direction: when participants’ performance determines income, those who earn less money lie less than those who earn more. We do not find differences in lying when participants perform the same task but lie to keep windfall endowments.
We consider the Dirichlet Laplacian in a three-dimensional waveguide that is a small deformation ... more We consider the Dirichlet Laplacian in a three-dimensional waveguide that is a small deformation of a periodically twisted tube. The deformation is given by a bending and an additional twisting of the tube, both parametrized by a coupling constant δ. We expand the resolvent of the perturbed operator near the bottom of its essential spectrum and we show the existence of exactly one resonance, in the asymptotic regime of δ small. We are able to perform the asymptotic expansion of the resonance in δ, which in particular permits us to give a quantitative geometric criterion for the existence of a discrete eigenvalue below the essential spectrum. In the particular case of perturbations of straight tubes, we are able to show the existence of resonances not only near the bottom of the essential spectrum but near each threshold in the spectrum. We also obtain the asymptotic behavior of the resonances in this situation, which is generically different from the first case.
Yes it does ! Indeed an extended version of Levinson's theorem is proposed for a system involving... more Yes it does ! Indeed an extended version of Levinson's theorem is proposed for a system involving complex eigenvalues. The perturbed system corresponds to a realization of the Schrödinger operator with inverse square potential on the half-line, while the Dirichlet Laplacian on the half-line is chosen for the reference system. The resulting relation is an equality between the number of eigenvalues of the perturbed system and the winding number of the scattering system together with additional operators living at 0-energy and at infinite energy.
Abu Dhabi International Petroleum Exhibition & Conference, 2018
The formation evaluation of low-porosity tight gas reservoirs in Argentina presents several well-... more The formation evaluation of low-porosity tight gas reservoirs in Argentina presents several well-known challenges in the estimation of main petrophysical properties as porosity, clay fraction, permeability, and water saturation. The main goal is to accurately quantify these petrophysical properties with a consistent and reliable petrophysical model. The next task is to reveal the key petrophysical responses that represent the link between petrophysics and production. The present work describes the main petrophysical challenges faced and an innovative workflow used in the Lindero Atravesado field with clear examples to illustrate the effectiveness of this approach. The workflow involves measurements such as advanced elemental gamma ray spectroscopy, multifrequency dielectric dispersion, and nuclear magnetic resonance (NMR). The advanced elemental gamma ray spectroscopy has been key for the creation of a robust mineralogical model, and to derive the matrix properties used to obtain an...
Geriatrie et psychologie neuropsychiatrie du vieillissement, 2017
Olders patients are exposed to iatrogenic risk as they are often frail, with multiple pathologies... more Olders patients are exposed to iatrogenic risk as they are often frail, with multiple pathologies and therefore polymedicated. The objective of this study was to evaluate the knowledge of treatment in the elderly before and after a time of oral therapeutic education accompanied by the submission of a written educational support. The impact of that education on the adhesion was also evaluated. We've included patients aged at least 75 years old, living at home, and managing themselves their treatment. At study entry, patients were evaluated by their regular physician about knowledge and compliance of their treatment and were receiving therapeutic education time. Three months later, knowledge and adherence to treatment were re-evaluated by the treating physician during an interview. The adhesion was evaluated using the Morisky score. 89 subjects were enrolled between May and October 2015. The average age was 81.9 years old and most patients were autonomous. We observed an improveme...
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