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Papers by Juan David Garcia Hoyos

Los constructores de proyectos civiles se enfrentan permanentemente al reto de aumentar la produc... more Los constructores de proyectos civiles se enfrentan permanentemente al reto de aumentar la productividad a través de la optimización de recursos y la interacción de los mismos, situación que ha sido abordada desde diferentes perspectivas utilizando estrategias computacionales y manuales. En este trabajo se presenta la utilización de un módulo programable y autónomo para captura de imágenes digitales de procesos constructivos, con alimentación a través de energía fotovoltaica. Se incluyen equipos de hardware y componentes electrónicos como cámaras fotográficas, cámaras de video, tarjetas electrónicas, computadores, paneles solares, plataforma web y sistemas de comunicación; controlados a través de un software diseñado específicamente para este fin, que facilita el control de equipos y componentes. Mediante este sistema es posible contar con datos confiables y considerar las variables que intervienen en el proceso, lo que facilita la toma de decisiones respecto a métodos constructivos...

Quien leyese este articulo se remitiria de inmediato a Britney Spears y su popular cancion One Mo... more Quien leyese este articulo se remitiria de inmediato a Britney Spears y su popular cancion One More Time, o a Mike Royko, un famoso escritor cuya obra principal sostiene el mismo nombre de este texto, o simplemente a una estructura gramatical inglesa.

Revista Virtual Universidad Catolica Del Norte, Apr 8, 2011

AIDS care, Jan 3, 2016

Sexually transmitted infections (STIs) are recognized as one of the conditions in which HIV testi... more Sexually transmitted infections (STIs) are recognized as one of the conditions in which HIV testing is most clearly indicated. We analyse whether people diagnosed with an STI are being tested for HIV according to the experience of participants in an outreach rapid testing programme in Spain. Between 2008 and 2010, 6293 individuals underwent rapid testing and completed a self-administered questionnaire. We calculated the percentage of individuals that were diagnosed with an STI in the last 5 years and identified the setting where the last episode occurred. We then determined the percentage not receiving an HIV test after the last STI diagnosis and estimated the associated factors. Overall, 17.3% (N = 959) of participants reported an STI diagnosis in the last 5 years, of which 81.5% occurred in general medical settings. Sixty-one percent reported not undergoing HIV testing after their last STI diagnosis, 2.2% of whom reported they had refused the test. Not receiving an HIV test after ...

SSRN Electronic Journal, 2012

Law Center. He currently practices with the Colombian firm Brigard & Urrutia in the International... more Law Center. He currently practices with the Colombian firm Brigard & Urrutia in the International Trade and Foreign Exchange Departments. Thanks are due to Marcia Wiss and Doud Khairallah, for research input.

SSRN Electronic Journal, 2012

There are several mechanisms that countries recur to further integrate their economies. Such mech... more There are several mechanisms that countries recur to further integrate their economies. Such mechanisms take normally the form of international agreements, some to cooperate, others to promote and protect investments and most of them to liberalize trade. This paper reviews the international legal instruments that Colombia and China have entered into in an effort to deepening their economic integration. Special emphasis is given to the possibility of entering into negotiations of new instruments putting special emphasis on the viability and convenience of entering into a partial scope agreement (PSA) versus a free trade agreement (FTA).

International Journal of Dermatology, 2007

Background: Autologous fat grafting has been widely applied in cosmetic breast augmentation in re... more Background: Autologous fat grafting has been widely applied in cosmetic breast augmentation in recent years. However, nontuberculous mycobacteria infection, as one of the multiple complications described in the literature, has been less well discussed. Objective: The aims of the study were to report 5 cases of nontuberculous mycobacteria infection after autologous fat injection for the cosmetic breast augmentation and to explore its causes. Methods: In this noncomparative, retrospective, and interventional case series, we identified 5 patients with nontuberculous mycobacteria infection. All patients had a history of previous autologous fat injection into the breast for cosmetic purpose, performed in different plastic facilities. Results: Five patients developed nontuberculous mycobacteria infection after autologous fat injection for cosmetic breast augmentation and came to our group for treatment. Grafted fat removal through multiple debridement and long-term intravenous and oral antibiotic therapy were required in our cases. Conclusions: The number of nontuberculous mycobacteria infection after autologous fat injection into the breast is increasing. Surgeons should be aware of the complication, which rarely manifests during the procedure itself. Strict aseptic principles should be obeyed throughout the surgery.

Pediatric Dermatology, 2009

A Colombian girl was born with linear verrucous lesions of the right forearm and fingers, hypopig... more A Colombian girl was born with linear verrucous lesions of the right forearm and fingers, hypopigmented bands and streaks on the right arm, verrucous plaques on the right labium majus which extended to the right upper inner thigh, a crooked right tibia, nasal septum deviation to the right, lumbar kyphoscoliosis to the right, and other right-sided abnormalities. Radiographs showed stippled calcification of the tibia1 epiphysis, hypoplasia of the calcaneus, and astragalus of the right foot and delta phalanges of the right ring finger. Histologic examination dem

Medical and Biological Engineering and Computing, 2006

This paper presents a new, simple model to evaluate the instrumental random errors in kinematic a... more This paper presents a new, simple model to evaluate the instrumental random errors in kinematic analysis of human movements using stereophotogrammetry. By means of equations analogous to that relate linear or angular momentum with linear or angular velocities, a direct measurement of instantaneous motion can be made without previous finite displacement analysis. Single explicit expressions can be obtained to evaluate the influence of instrumental random errors in the accuracy of the kinematic variables. From these expressions, some conclusions about the effect of marker cluster design on the experimental errors are obtained. An experiment has been carried out in order to validate the proposed technique and to assess the experimental errors in linear and angular velocity measurement and its influence in instantaneous helical axis determination.

Journal of the International AIDS Society, 2013

Introduction: Increasing the uptake of HIV testing and decreasing the number of undiagnosed peopl... more Introduction: Increasing the uptake of HIV testing and decreasing the number of undiagnosed people is a priority for HIV prevention. Understanding the barriers that hinder people from testing is vital, particularly when working with especially vulnerable populations like migrants. Most data available on migrants are based on African migrants in the UK, while barriers to HIV testing in Latin-American migrants living in Europe remain unexplored. Still, they account for a quarter of new diagnosis in Spain and suffer higher rates of delayed diagnosis. Methods: Between May 2008 and March 2011, a mobile unit offered free rapid HIV tests in different Spanish cities. We compared the prevalence of no previous testing, adjusting for potential confounders by two multivariate logistic models, and described differences in perceived barriers to testing in Latin-American migrants living in Spain versus Spaniards. Participants included men who have sex with men (MSM), men who have sex exclusively with women (MSW), and women. Results: Of the 5920 individuals who got tested and answered a self-administered questionnaire, 36.5% were MSM (20.4% previously untested), 28.9% were MSW (49% previously untested) and 34.6% were women (53% previously untested). Almost one quarter were Latin-American, of whom 30% had never been tested versus 45% of untested Spaniards. After adjusting for potential confounders, Spaniards were more likely to report no previous testing than Latin-Americans among women and MSW all together (Odds Ratio (OR)02.0; 95% Confidence Interval (CI): 1.7Á2.4) and among MSM (OR 01.6; 95% CI: 1.2Á2.0). Among the 2455 who had never undergone an HIV test before, main barriers to testing were low perceived risk (54% Spaniards vs. 47% Latin-American) and concerns arising from the loss of anonymity (19.5% vs. 16.9%). Fear of rejection or discrimination and fear of legal problems were a barrier for B2%. Conclusions: Latin-American migrants living in Spain were more likely to get tested than Spaniards. Regardless of nationality, low perceived risk was the main barrier to testing whereas fear of stigma or discrimination and fear of legal problems were merely incidental. However, new Spanish austerity policies regarding healthcare for migrants in response to the economic crisis may reverse this situation.

Enfermedades Infecciosas y Microbiología Clínica, 2014

We estimate the proportion of participants willing to pay the US price (€30) or €20 for an HIV se... more We estimate the proportion of participants willing to pay the US price (€30) or €20 for an HIV self-test and analyse their associated factors. In a street-based testing program, 497 participants in a feasibility self-test study answered the question, "What would be the maximum price you would be willing to pay for a similar test to this one so you can use it at your convenience?" Only 17.9% would pay ≥€30, while 40.0%, ≥€20. In the logistic regression, paying more was associated with being tested outside the campuses and having paid or been paid for sex. In Spain, self-testing would not have an impact unless it became more affordable to potential users.

Los constructores de proyectos civiles se enfrentan permanentemente al reto de aumentar la produc... more Los constructores de proyectos civiles se enfrentan permanentemente al reto de aumentar la productividad a través de la optimización de recursos y la interacción de los mismos, situación que ha sido abordada desde diferentes perspectivas utilizando estrategias computacionales y manuales. En este trabajo se presenta la utilización de un módulo programable y autónomo para captura de imágenes digitales de procesos constructivos, con alimentación a través de energía fotovoltaica. Se incluyen equipos de hardware y componentes electrónicos como cámaras fotográficas, cámaras de video, tarjetas electrónicas, computadores, paneles solares, plataforma web y sistemas de comunicación; controlados a través de un software diseñado específicamente para este fin, que facilita el control de equipos y componentes. Mediante este sistema es posible contar con datos confiables y considerar las variables que intervienen en el proceso, lo que facilita la toma de decisiones respecto a métodos constructivos...

Quien leyese este articulo se remitiria de inmediato a Britney Spears y su popular cancion One Mo... more Quien leyese este articulo se remitiria de inmediato a Britney Spears y su popular cancion One More Time, o a Mike Royko, un famoso escritor cuya obra principal sostiene el mismo nombre de este texto, o simplemente a una estructura gramatical inglesa.

Revista Virtual Universidad Catolica Del Norte, Apr 8, 2011

AIDS care, Jan 3, 2016

Sexually transmitted infections (STIs) are recognized as one of the conditions in which HIV testi... more Sexually transmitted infections (STIs) are recognized as one of the conditions in which HIV testing is most clearly indicated. We analyse whether people diagnosed with an STI are being tested for HIV according to the experience of participants in an outreach rapid testing programme in Spain. Between 2008 and 2010, 6293 individuals underwent rapid testing and completed a self-administered questionnaire. We calculated the percentage of individuals that were diagnosed with an STI in the last 5 years and identified the setting where the last episode occurred. We then determined the percentage not receiving an HIV test after the last STI diagnosis and estimated the associated factors. Overall, 17.3% (N = 959) of participants reported an STI diagnosis in the last 5 years, of which 81.5% occurred in general medical settings. Sixty-one percent reported not undergoing HIV testing after their last STI diagnosis, 2.2% of whom reported they had refused the test. Not receiving an HIV test after ...

SSRN Electronic Journal, 2012

Law Center. He currently practices with the Colombian firm Brigard & Urrutia in the International... more Law Center. He currently practices with the Colombian firm Brigard & Urrutia in the International Trade and Foreign Exchange Departments. Thanks are due to Marcia Wiss and Doud Khairallah, for research input.

SSRN Electronic Journal, 2012

There are several mechanisms that countries recur to further integrate their economies. Such mech... more There are several mechanisms that countries recur to further integrate their economies. Such mechanisms take normally the form of international agreements, some to cooperate, others to promote and protect investments and most of them to liberalize trade. This paper reviews the international legal instruments that Colombia and China have entered into in an effort to deepening their economic integration. Special emphasis is given to the possibility of entering into negotiations of new instruments putting special emphasis on the viability and convenience of entering into a partial scope agreement (PSA) versus a free trade agreement (FTA).

International Journal of Dermatology, 2007

Background: Autologous fat grafting has been widely applied in cosmetic breast augmentation in re... more Background: Autologous fat grafting has been widely applied in cosmetic breast augmentation in recent years. However, nontuberculous mycobacteria infection, as one of the multiple complications described in the literature, has been less well discussed. Objective: The aims of the study were to report 5 cases of nontuberculous mycobacteria infection after autologous fat injection for the cosmetic breast augmentation and to explore its causes. Methods: In this noncomparative, retrospective, and interventional case series, we identified 5 patients with nontuberculous mycobacteria infection. All patients had a history of previous autologous fat injection into the breast for cosmetic purpose, performed in different plastic facilities. Results: Five patients developed nontuberculous mycobacteria infection after autologous fat injection for cosmetic breast augmentation and came to our group for treatment. Grafted fat removal through multiple debridement and long-term intravenous and oral antibiotic therapy were required in our cases. Conclusions: The number of nontuberculous mycobacteria infection after autologous fat injection into the breast is increasing. Surgeons should be aware of the complication, which rarely manifests during the procedure itself. Strict aseptic principles should be obeyed throughout the surgery.

Pediatric Dermatology, 2009

A Colombian girl was born with linear verrucous lesions of the right forearm and fingers, hypopig... more A Colombian girl was born with linear verrucous lesions of the right forearm and fingers, hypopigmented bands and streaks on the right arm, verrucous plaques on the right labium majus which extended to the right upper inner thigh, a crooked right tibia, nasal septum deviation to the right, lumbar kyphoscoliosis to the right, and other right-sided abnormalities. Radiographs showed stippled calcification of the tibia1 epiphysis, hypoplasia of the calcaneus, and astragalus of the right foot and delta phalanges of the right ring finger. Histologic examination dem

Medical and Biological Engineering and Computing, 2006

This paper presents a new, simple model to evaluate the instrumental random errors in kinematic a... more This paper presents a new, simple model to evaluate the instrumental random errors in kinematic analysis of human movements using stereophotogrammetry. By means of equations analogous to that relate linear or angular momentum with linear or angular velocities, a direct measurement of instantaneous motion can be made without previous finite displacement analysis. Single explicit expressions can be obtained to evaluate the influence of instrumental random errors in the accuracy of the kinematic variables. From these expressions, some conclusions about the effect of marker cluster design on the experimental errors are obtained. An experiment has been carried out in order to validate the proposed technique and to assess the experimental errors in linear and angular velocity measurement and its influence in instantaneous helical axis determination.

Journal of the International AIDS Society, 2013

Introduction: Increasing the uptake of HIV testing and decreasing the number of undiagnosed peopl... more Introduction: Increasing the uptake of HIV testing and decreasing the number of undiagnosed people is a priority for HIV prevention. Understanding the barriers that hinder people from testing is vital, particularly when working with especially vulnerable populations like migrants. Most data available on migrants are based on African migrants in the UK, while barriers to HIV testing in Latin-American migrants living in Europe remain unexplored. Still, they account for a quarter of new diagnosis in Spain and suffer higher rates of delayed diagnosis. Methods: Between May 2008 and March 2011, a mobile unit offered free rapid HIV tests in different Spanish cities. We compared the prevalence of no previous testing, adjusting for potential confounders by two multivariate logistic models, and described differences in perceived barriers to testing in Latin-American migrants living in Spain versus Spaniards. Participants included men who have sex with men (MSM), men who have sex exclusively with women (MSW), and women. Results: Of the 5920 individuals who got tested and answered a self-administered questionnaire, 36.5% were MSM (20.4% previously untested), 28.9% were MSW (49% previously untested) and 34.6% were women (53% previously untested). Almost one quarter were Latin-American, of whom 30% had never been tested versus 45% of untested Spaniards. After adjusting for potential confounders, Spaniards were more likely to report no previous testing than Latin-Americans among women and MSW all together (Odds Ratio (OR)02.0; 95% Confidence Interval (CI): 1.7Á2.4) and among MSM (OR 01.6; 95% CI: 1.2Á2.0). Among the 2455 who had never undergone an HIV test before, main barriers to testing were low perceived risk (54% Spaniards vs. 47% Latin-American) and concerns arising from the loss of anonymity (19.5% vs. 16.9%). Fear of rejection or discrimination and fear of legal problems were a barrier for B2%. Conclusions: Latin-American migrants living in Spain were more likely to get tested than Spaniards. Regardless of nationality, low perceived risk was the main barrier to testing whereas fear of stigma or discrimination and fear of legal problems were merely incidental. However, new Spanish austerity policies regarding healthcare for migrants in response to the economic crisis may reverse this situation.

Enfermedades Infecciosas y Microbiología Clínica, 2014

We estimate the proportion of participants willing to pay the US price (€30) or €20 for an HIV se... more We estimate the proportion of participants willing to pay the US price (€30) or €20 for an HIV self-test and analyse their associated factors. In a street-based testing program, 497 participants in a feasibility self-test study answered the question, "What would be the maximum price you would be willing to pay for a similar test to this one so you can use it at your convenience?" Only 17.9% would pay ≥€30, while 40.0%, ≥€20. In the logistic regression, paying more was associated with being tested outside the campuses and having paid or been paid for sex. In Spain, self-testing would not have an impact unless it became more affordable to potential users.