Magda Alexandra Trujillo‐Jiménez, Pablo Navarro, Bruno Pazos, Leonardo Morales, Virgínia Ramallo, Carolina Paschetta, Soledad de Azevedo, Anahí Ruderman, Orlando J. Pérez, Claudio Delrieux, Rolando González‐José,
Current point cloud extraction methods based on photogrammetry generate large amounts of spurious detections that hamper useful 3D mesh reconstructions or, even worse, the possibility of adequate measurements. Moreover, noise removal methods for point clouds are complex, slow and incapable to cope with semantic noise. In this work, we present body2vec, a model-based body segmentation tool that uses a specifically trained Neural Network architecture. Body2vec is capable to perform human body point ...
Tópico(s): Thermoregulation and physiological responses
2020 - Multidisciplinary Digital Publishing Institute | Journal of Imaging
Diego Reginensi, Didio Ortiz, Andrea Pravia, Andrea Burillo, Félix Leonardo Morales, Carly Morgan, Lindsay Jimenez, Kunjan R. Dave, Miguel A. Pérez‐Pinzón, Rolando A. Gittens,
Recent advancements in tissue engineering suggest that biomaterials, such as decellularized extracellular matrix (ECM), could serve to potentiate the localization and efficacy of regenerative therapies in the central nervous system. Still, what factors and which mechanisms are required from these ECM-based biomaterials to exert their effect are not entirely understood. In this study, we use the brain as a novel model to test the effects of particular biochemical and structural properties by evaluating, ...
Tópico(s): Electrospun Nanofibers in Biomedical Applications
2020 - Mary Ann Liebert, Inc. | Tissue Engineering Part A
Thomas Lux, Leonardo Morales‐Arias, Cristina Sattarhoff,
ABSTRACT Multifractal models have recently been introduced as a new type of data‐generating process for asset returns and other financial data. Here we propose an adaptation of this model for realized volatility. We estimate this new model via generalized method of moments and perform forecasting by means of best linear forecasts derived via the Levinson–Durbin algorithm. Its out‐of‐sample performance is compared against other popular time series specifications. Using an intra‐day dataset for five ...
Tópico(s): Stock Market Forecasting Methods
2014 - Wiley | Journal of Forecasting
Produção Nacional
Revisado por pares
Leonardo Morales‐Arias, Guilherme V. Moura,
This article investigates the statistical and economic implications of adaptive forecasting of exchange rates with panel data. The candidate exchange rate predictors are drawn from (i) macroeconomic 'fundamentals', (ii) returns/volatility of asset markets, and (iii) cyclical and confidence indices. The proposed forecasting strategy exploits information from many dimensions, since it generates alternative exchange rate forecasts at various horizons from each of the potential predictors using single market, ...
Tópico(s): Financial Risk and Volatility Modeling
2013 - Elsevier BV | International Journal of Forecasting
Thomas Lux, Leonardo Morales‐Arias,
Abstract A Monte Carlo (MC) experiment is conducted to study the forecasting performance of a variety of volatility models under alternative data-generating processes (DGPs). The models included in the MC study are the (Fractionally Integrated) Generalized Autoregressive Conditional Heteroskedasticity models ((FI)GARCH), the Stochastic Volatility model (SV), the Long Memory Stochastic Volatility model (LMSV) and the Markov-switching Multifractal model (MSM). The MC study enables us to compare the relative ...
Tópico(s): Market Dynamics and Volatility
2013 - Taylor & Francis | Quantitative Finance
... like to thank the Institute, Harmen Lehment, and Leonardo Morales-Arias for their kind hospitality during the visit. ...
Tópico(s): Auditing, Earnings Management, Governance
2011 - Taylor & Francis | European Journal of Finance
Thomas Lux, Leonardo Morales‐Arias,
The Markov-switching Multifractal model of asset returns with Student-t innovations (MSM-t henceforth) is introduced as an extension to the Markov-switching Multifractal model of asset returns (MSM). The MSM-t can be estimated via Maximum Likelihood (ML) and Generalized Method of Moments (GMM) and volatility forecasting can be performed via Bayesian updating (ML) or best linear forecasts (GMM). Monte Carlo simulations show that using GMM plus linear forecasts leads to minor losses in efficiency compared ...
Tópico(s): Market Dynamics and Volatility
2010 - Elsevier BV | Computational Statistics & Data Analysis
Leonardo Fabio Morales, Leonardo Bonilla‐Mejía, José David Pulido, Luz Adriana Flórez, Didier Hermida, Karen L. Pulido‐Mahecha, Francisco Javier Lasso-Valderrama,
Abstract We assess the effect of the COVID‐19 pandemic and particularly the sector‐specific mobility restrictions on the Colombian labour market. We exploit the sectoral and temporal variation of the restriction policies to identify their effect. Mobility restrictions significantly reduced employment, accounting for approximately a quarter of the total job loss between February and April of 2020. The remaining three quarters of the job losses could be attributed to the disease's regional patterns ...
Tópico(s): Employment and Welfare Studies
2022 - Wiley | Canadian Journal of Economics/Revue canadienne d économique
Carlos Medina, Leonardo. Morales,
Comments Raquel Bernal and Maximo Torero Raquel Bernal: In this paper, the authors seek to evaluate the effects of the cross subsidy-stratification system for public utility services on housing prices in Bogotá, Colombia. In addition, they use their estimates to assess the extent to which the distortions in housing prices associated with the subsidy-stratification system affect final subsidy beneficiaries. Intuitively, their exercise provides a way of calculating how much more people pay for houses ...
Tópico(s): Housing Market and Economics
2007 - | Economía
Eleonora Dávalos, Leonardo Fabio Morales, Jennifer S. Holmes, Liliana M. Dávalos,
What factors led to the surprise defeat of the Colombian peace referendum? Initial analyses suggested a link between support for peace and the experience of violence, but economic conditions and political support for incumbent parties also affect electoral outcomes. We use Bayesian hierarchical models to test links between referendum result and previous violence victimization, economic conditions, and support for Centro Democrático (the main party opposed to the peace agreement). There was less support ...
Tópico(s): Agricultural risk and resilience
2018 - SAGE Publishing | Journal of Politics in Latin America
Leonardo Fabio Morales, Carlos Medina,
In 2013, Colombia implemented a tax reform that reduced payroll taxes by a total of 13.5 percentage points of wages. This paper evaluates the effects of this component of the 2012 Colombian tax reform on firms' formal employment and average wages. We construct a panel of firms based on their employees' administrative records. To account for the endogeneity of the treatment, we use an instrumental variables technique that exploits the exogenous variation from the decisions of firms that are similar ...
Tópico(s): Corporate Taxation and Avoidance
2017 - | Economía
R Carrasco, M Castañón, Begoña San Vicente, Xavier Tarrado, A Montaner, Leonardo Fabio Morales,
Pulmonary sequestration is a congenital malformation within the spectrum of bronchopulmonary foregut anomalies. This pathologic condition was first described by Rokitansky1Rokitansky C Lehrbuch der pathologischen Anatomie.in: ed 3. 1861: 44Google Scholar and Rektorzik2Rektorzik E Ueber accessorische Lungenlapen.Wochenbl Z Ges Aerzte. 1861; 17: 4-6Google Scholar in 1861 with the term "accessory pulmonary lobe." It was renamed "pulmonary sequestration" by Price3Pryce DM Lower accessory pulmonary artery ...
Tópico(s): Tracheal and airway disorders
2002 - Elsevier BV | Journal of Thoracic and Cardiovascular Surgery
M. A. Sancho, A Albert, V. Cusí, C Grande, César Aguilar, Leonardo Fabio Morales,
Objective We present three new cases of congenital upper lip fistula. Two of them were located in the philtrum midline, one of which was associated to a double maxillary frenulum, a medial lip cleft, and a medial cleft of the primitive palate. The other was located in the left side of the vermilion. All three patients had clear fluid discharge through the fistulous orifice without pain. Two of them had a history of recurrent swelling of the philtrum area. Conclusions A simple surgical excision is ...
Tópico(s): Cleft Lip and Palate Research
2002 - SAGE Publishing | The Cleft Palate-Craniofacial Journal
Miguel Soares‐Oliveira, Vera Julia, Luis García‐Aparicio, Leonardo Fabio Morales,
Abstract Prepubic sinuses are rare congenital anomalies of the urinary tract. There have been few case reports in the literature. The authors describe 2 clinical cases of this entity. A review of the 20 cases previously reported, to clarify the anatomic features and the embryology of this infrequent congenital anomaly, also is reported. Furthermore, the authors propose to classify these lesions not as dorsal urethral duplications but as fistulas of the primitive urogenital sinus, with 3 anatomic types: ...
Tópico(s): Urologic and reproductive health conditions
2002 - Elsevier BV | Journal of Pediatric Surgery
A Albert, M. A. Sancho, Julia Victoria, F Sánchez Díaz, Josep Antoni Bombí, Leonardo Fabio Morales,
Tópico(s): Urological Disorders and Treatments
2001 - Springer Science+Business Media | Pediatric Surgery International
M Castañón, Elena Muñoz‐Forner, R Carrasco, J. Rodó, Leonardo Fabio Morales,
Abstract Background/Purpose: The onlay island flap urethroplasty was first described in the repair of mid and distal penile hypospadias. Since then, this technique has been increasingly used in more severe cases of hypospadias, because of the complications of tubularized flaps, mainly megaurethra and proximal anastomotic strictures. The aim of this study was to compare the morbidity of these 2 techniques. Methods: Between April 1994 and December 1998, 80 patients underwent surgical treatment for hypospadias. ...
Tópico(s): Urinary and Genital Oncology Studies
2000 - Elsevier BV | Journal of Pediatric Surgery
M Castañón, J Margarit, R Carrasco, Margarita Vancells, A Albert, Leonardo Fabio Morales,
Background: Surgical exeresis is regarded as the first choice treatment for cystic lymphangioma. Surgery may be extremely complex, giving rise to complications. Several therapeutic methods have been described to avoid the complications derived from the conventional surgical approach. The idea of treating lymphangioma by means of suction and injection of fibrin sealant (Tissucol), is an alternative to surgery. Methods: The authors present 19 cases of cystic lymphangioma, treated with fibrin sealant ...
Tópico(s): Teratomas and Epidermoid Cysts
1999 - Elsevier BV | Journal of Pediatric Surgery
J.J. Roa, Leonardo Fabio Morales, Francisco José Parri, Julia Victoria, Isidro Claret,
In this article two cases of idiopathic duodenal dilation are described. These cases meet the present criteria for segmental dilations of the intestine. The onset of the clinical features was acute in one case and chronic in the other. However, the radiological images were similar in both cases and provided the diagnosis. Surgical treatment consisted of duodenal resection and tapering and was curative in one case. The other patient died shortly after surgery. The duodenal specimens showed normal ...
Tópico(s): Congenital gastrointestinal and neural anomalies
1989 - Elsevier BV | Journal of Pediatric Surgery
Leonardo Fabio Morales, J.J. Roa, M Mongard, Sancho Ma, Alexander D. Bach,
Tópico(s): Ureteral procedures and complications
1983 - Elsevier BV | Journal of Pediatric Surgery
... doi.org/10.1080/13229400.2015.1106338Eleonora Davalos, Leonardo Fabio Morales Economic crisis promotes fertility decline in poor areas: ...
Tópico(s): Gender, Labor, and Family Dynamics
1973 - University of Chicago Press | Journal of Political Economy
... org/10.1007/s13524-017-0614-yEleonora Davalos, Leonardo Fabio Morales Economic crisis promotes fertility decline in poor areas: ...
Tópico(s): Gender, Labor, and Family Dynamics
1965 - University of Chicago Press | Journal of Political Economy
Leonardo Fabio Morales, José Lobo,
We propose a procedure that allows recovering an estimate of vacancies from firms’ information on hires and separations. Using estimated vacancies, we analyze the aggregated behavior of vacancies for the Colombian labor market. In addition, we estimate matching functions to conclude that the matching formation process for the Colombian labor market is random; this finding support the idea that frictions are mainly due to informational restrictions, and not explained by a structural mismatch. Our ...
Tópico(s): Merger and Competition Analysis
2021 - IOS Press | Journal of Economic and Social Measurement
Lina Cardona‐Sosa, Luz Adriana Flórez, Leonardo Fabio Morales,
Abstract In this paper, we explore one of the oldest labour market phenomena documented in the literature: the added worker effect. This refers to the labour supply response of secondary earners of the household to the main earner's job losses. Using longitudinal data for Colombia, we find that when the head of the household becomes unemployed, the labour supply of the female partner increases between 9 and 20 percentage points. Such response appears during the first 6 months of the unemployment ...
Tópico(s): Employment and Welfare Studies
2018 - Wiley | Labour
Ana María Tribín-Uribe, Achyuta Adhvaryu, César Anzola-Bravo, Oscar Iván Ávila-Montealegre, Leonardo Bonilla‐Mejía, Juan Carlos Castro-Fernández, Luz Adriana Flórez, Ánderson Grajales-Olarte, Alexander Guarín-López, Franz Hamann, Didier Hermida, Gaurav Khanna, Francisco Javier Lasso-Valderrama, Carlos Medina, Ligia Alba Melo-Becerra, Juan Camilo Méndez-Vizcaíno, Leonardo Fabio Morales, Anant Nyshadam, Juan J. Ospina-Tejeiro, Andrea Otero-Cortés, José David Pulido, Jorge Enrique Ramos-Forero, Mario Andrés Ramos-Veloza, Jorge Tamayo, Santiago Velásquez,
El siguiente articulo contribuye al estudio del fenomeno migratorio desde Venezuela en Colombia mediante un analisis de sus efectos y desafios sobre el ajuste de la economia. El presente articulo se divide en dos modulos. En el primero se describe y se caracteriza la poblacion migrante desde Venezuela en terminos socio-economicos y demograficos y se indaga acerca sobre sus patrones de consumo y ahorro. En el segundo modulo se estudian las implicaciones del choque migratorio en tres diferentes esferas ( ...
Tópico(s): Economic and Social Development
2020 - CIG Media Group | Ensayos sobre Política Económica
Leonardo Morales‐Arias, Guilherme V. Moura,
Purpose The purpose of this paper is to propose and test empirically an inflation model containing permanent and transitory heteroskedastic components for the G7 countries. More specifically, recent evidences from the literature are gathered to construct a model with a heteroskedastic global component capturing comovements amongst G7 economies. Moreover, evidence of asymmetric generalized autoregressive conditionally heteroskedastic effects both in the transitory and in the permanent components ...
Tópico(s): Economic Policies and Impacts
2013 - Emerald Publishing Limited | Journal of Economic Studies
Luz Adriana Flórez, Leonardo Fabio Morales, Daniel Medina, José Lobo,
This paper compares labor market flows between a developing economy, Colombia, and a developed one, the United States (US). In a comparative framework, we explore measures of labor market flows across dimensions such as firm size, age, and economic sector. This comparison allows us testing, for both countries, a series of interesting hypothesis suggested in the literature, namely the negative systematic relationship between firm size/age and employment growth rate. We find that labor market fluidity ...
Tópico(s): Unemployment and Economic Growth
2020 - Springer Science+Business Media | Small Business Economics
Leonardo Fabio Morales, Carlos Medina,
In 2013, Colombia implemented a tax reform that reduced payroll taxes by a total of 13.5 percentage points of wages. This paper evaluates the effects of this component of the 2012 Colombian tax reform on firms’ formal employment and average wages. We construct a panel of firms based on their employees’ administrative records. To account for the endogeneity of the treatment, we use an instrumental variables technique that exploits the exogenous variation from the decisions of firms that are similar ...
Tópico(s): Fiscal Policy and Economic Growth
2017 - | Economía
M. A. Sancho, A Albert, V. Cusí, C Grande, César Aguilar, Leonardo Fabio Morales,
Tópico(s): Tumors and Oncological Cases
2002 - SAGE Publishing | The Cleft Palate-Craniofacial Journal
Ana Tribín, Karen García-Rojas, Paula Herrera-Idárraga, Leonardo Fabio Morales, Natalia Ramírez-Bustamante,
... Journal of Development Studies and Spatial Economic Analysis.Leonardo Fabio MoralesLeonardo Morales is a member of the Group of Analysis ...
Tópico(s): Gender, Labor, and Family Dynamics
2023 - Taylor & Francis | Feminist Economics
David E. Timaran, Christian Alexander Torres-Ramírez, Leonardo Mauricio Morales-Jaramillo, Yohana Sarahi Mateo-Camacho, Édgar Tapia-Rangel, Karla Daniela Fuentes-Badillo, Ana Milena Hernández-Rojas, Valeria Morales-Domínguez, Pedro Fernando Saenz-Castillo, Lina Marcela Parra-Guerrero, Katherine Isamara Jacome-Portilla, Daniel Ernesto Obrando-Bravo, Giovanni Saul Contla-Trejo, Manuel Gerardo Falla-Trujillo, Gerardo Rafael Punzo-Alcaraz, Gustavo Adolfo Feria-Arroyo, Alberto Joshua Chávez-Sastre, Jovani Govea-Palma, Santiago Carrillo-Álvarez, Julita Orozco-Vázquez,
To assess the effect of computed tomography (CT)-based residual lung volume (RLV) on mortality of patients with coronavirus disease 2019 (COVID-19).A single-center, retrospective study of a prospectively maintained database was performed. In total, 138 patients with COVID-19 were enrolled. Baseline chest CT scan was performed in all patients. CT-based automated and semi-automated lung segmentation was performed using the Alma Medical workstation to calculate normal lung volume, lung opacities volume, ...
Tópico(s): Long-Term Effects of COVID-19
2020 - Lippincott Williams & Wilkins | Journal of Thoracic Imaging