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Ítem A case study on scheduling university timetables using a three-phase matheuristic(Universidad EAFIT, 2022) Rodríguez Garzón, Camilo Andrés; Rivera, Juan CarlosÍtem A Class of Conservative Lagrangian-Eulerian Methods on Triangular Grids for Hyperbolic Problems : Design, Analysis and Applications(Universidad EAFIT, 2024) Agudelo Quiceno, Jorge Eliécer; Pérez Sepúlveda, John Alexander; Cano Sánchez, José AlbeiroIn this thesis, we construct, analyze and implement a class of fully-discrete and semi-discrete schemes on triangular grids intended to numerically solve initial value problems involving multidimensional hyperbolic conservation and balance laws, both scalar and systems. The construction of this novel class of schemes is based on the no-flow surface/curve concept and introduces an effective class of numerical fluxes that do not require constructing or evaluating the Jacobian matrix of the respective flux functions. The implementation of the new fully-discrete and semi-discrete Lagrangian-Eulerian schemes, , in the solution of nontrivial scalar and systems problems, is performed using a weak CFL-type stability condition that is independent of the eigenvalues (exact and approximate values) of the relevant Jacobian of the numerical flux functions, and without the need for high-resolution reconstruction procedures.Ítem A comparative study of the hydrodynamic performance of planing boats through experimental and statistical approaches(Universidad EAFIT, 2021) Giraldo Pérez, Erick Santiago; Osorio Gómez, GilbertoÍtem A Dynamic Approach to Modeling Count Data Based on Intensity Functions of Non-Homogeneous Poisson Processes and Functional Data Techniques(Universidad EAFIT, 2024) Chavarría Serna, Juan Esteban; Ortiz Arias, Santiago; Velasco, HenryÍtem A Fixed Grid method for hyperelastic models in large strain analysis using the level set method(Universidad EAFIT, 2014) Ramírez Benítez, William Alberto; García Ruíz, Manuel JulioA Fixed Grid Finite Element Method (FGFEM) in addition to a Mooney-Rivlin hyperelastic model is introduced. This method uses the mixed finite element formulation to treat the elements, but classifying these in a fixed cartesian grid that is superimposed over the model geometry -- In order to do this, the boundary tracking is achieved by solving the level set equation -- A numerical extrapolation of the displacement field from the solid domain to the entire fixed grid domain is done -- The system of equations are solved by the use of an incremental Newton-Raphson scheme -- Finally, some numerical examples are implemented and good convergence results are obtained for the displacement field, showing that FGFEM for the hyperelastic model is suitable for mechanical problems undergoing large strains and large displacementsÍtem A framework for Rapid Product Development based on digital techniques : an industrial case study of ceramic-based product(Universidad EAFIT, 2023) Trujillo Ángel, Luis Alfonso; Rodríguez Arroyave, Carlos ArturoÍtem A high-performance hybrid agent-based model for simulating urban vector-borne disease transmission(Universidad EAFIT, 2024) Londoño Montoya, Luisa Fernanda; Escudero Marín, Paula Alejandra; Escudero Marín, Paula AlejandraÍtem A logistic process immaturity model proposal(Universidad EAFIT, 2020) Márquez Gutiérrez, Mateo; Carmona González, Guillermo León; Castro Zuluaga, Carlos Alberto; Carmona González, Guillermo León; Castro Zuluaga, Carlos AlbertoÍtem A Multivariate Outlier Detection Methodology Based on S-Orthogonal DOBIN Projections(Universidad EAFIT, 2024) Cano Campiño, Andrés Mauricio; Ortiz Arias, SantiagoÍtem A new segmentation approach using dynamic variables on individuals(Universidad EAFIT, 2021) Prieto Escobar, Nicolás; Laniado Rodas, Henry; Monroy Osorio, Juan CarlosÍtem A new way for learning languages through virtual inmmersive environments(Universidad EAFIT, 2012) Torres Arias, Diego Mauricio; Treftz, HelmuthImmersive virtual environments or metaverse are representations of real or imaginative worlds created on the digital world with the purpose of making real situations or impossible experiences in the real world -- Users on these worlds represent themselves via avatars that interact in representation of the user. At present, these virtual worlds are used for business processes, research and education -- The purpose of this article is to describe the process of adapting an immersive virtual environment to be used as a virtual teaching-learning tool of the English language as a second language -- The immersive virtual world was tested in a learning environment, and the results of the evaluation is presented -- This research started with the identification of the adequate immersive platform, students group selection, test design and implementation in order to determining if it is more successful to teach over a virtual immersive environment or in the real classroom -- We proposed the hypothesis : “the Second Life tool is, at least, as effective in teaching a second language, in this case English, in A2 level students in the Common European Framework as the face-to-face mode.” and in order to validate it, a set of experiments were conducted -- Different measures of results were given comparing the performance of an experimental group against a control group -- The results of the experiments show that the experimental, using the virtual environment, has better improvement compared to the control group -- These results indicate that virtual immersive environments are efficient tools, useful in teaching-learning language processesÍtem A Novel Injectable Piezoelectric Hydrogel for Periodontal Disease Treatment.(Universidad EAFIT, 2023) Roldán Lopera, Lina María; Correa Vélez, Santiago AlbertoPeriodontal disease is a multifactorial, bacterially induced inflammatory condition characterized by the progressive destruction of periodontal tissues. The successful nonsurgical treatment of periodontitis requires multifunctional technologies offering antibacterial therapies and promotion of bone regeneration simultaneously. For the first time, in this study, an injectable piezoelectric hydrogel (PiezoGEL) was developed after combining gelatin methacryloyl (GelMA) with biocompatible piezoelectric fillers of barium titanate (BTO) that produce electrical charges when stimulated by biomechanical vibrations (e.g., mastication, movements). We harnessed the benefits of hydrogels (injectable, light curable, conforms to pocket spaces, biocompatible) with the bioactive effects of piezoelectric charges. A thorough biomaterial characterization confirmed piezoelectric fillers' successful integration with the hydrogel, photopolymerizability, injectability for clinical use, and electrical charge generation to enable bioactive effects (antibacterial and bone tissue regeneration). PiezoGEL showed significant reductions in pathogenic biofilm biomass (∼41%), metabolic activity (∼75%), and the number of viable cells (∼2-3 log) compared to hydrogels without BTO fillers in vitro. Molecular analysis related the antibacterial effects to be associated with reduced cell adhesion (downregulation of porP and fimA) and increased oxidative stress (upregulation of oxyR) genes. Moreover, PiezoGEL significantly enhanced bone marrow stem cell (BMSC) viability and osteogenic differentiation by upregulating RUNX2, COL1A1, and ALP. In vivo, PiezoGEL effectively reduced periodontal inflammation and increased bone tissue regeneration compared to control groups in a mice model. Findings from this study suggest PiezoGEL to be a promising and novel therapeutic candidate for the treatment of periodontal disease nonsurgically.Ítem A predictive approach based on fuzzy cognitive maps with federated learning(Universidad EAFIT, 2023) Garatejo Vargas, Edison Camilo; Aguilar Castro, José Lizandro; Hoyos, WilliamÍtem A Propulsion System Design Methodology Based on Overall Efficiency Optimization for Electrically-Powered Vessels(Universidad EAFIT, 2022) Mira Pineda, Juan David; Mejía-Gutiérrez, RicardoBoats have historically been an important mean of transportation, both for passengers and cargo, mainly in water-rich countries. Today, the electrification of transportation includes fluvial navigation, but energy efficiency remains a key issue. Energy consumption, in electrically powered vessels, is strongly influenced by several technical systems (e.g. hydrodynamics, battery, propulsion, etc.). While advances in some of those main systems are found in the literature, this research work focuses on the design and optimization of the “propulsion system (PS)” (Motor–Transmission–Propeller). By implementing an electric motor, the interaction of the mechanical components can be analyzed to find the optimal variables that will govern the performance of the vessel and that allow the optimal Motor–Transmission–Propeller combination. This manuscript presents the development of a multivariable optimization methodology to maximize the overall efficiency of a propulsion system and, therefore, the autonomy of an electrically powered river vessel. The methodology starts with the analysis of the physical variables that define the performance of the propulsion unit components, and establish an optimality problem and an exhaustive search model that considers all possible values of the key design parameters. A case study is presented for the design of an electrically powered river boat, for the transport of people, within the framework of the ENERGETICA 2030 project. This methodology enabled the choice of the PS’s components, while optimizing the energy consumption.Ítem A retail demand forecasting system of product groups characterized by time series based on “ensemble machine learning” techniques with feature enginnering(Universidad EAFIT, 2022) Mejía Chitiva, Santiago; Aguilar Castro, José LisandroÍtem A Robust Version of a Risk-Inverse Weighing Methodology for Portfolio Selection(Universidad EAFIT, 2024) Renza Chavarría, Juan Felipe; Ortiz Arias, SantiagoÍtem ABC design method: implementing adoption of innovation criteria through design heuristics for social design driven innovation projects(Universidad EAFIT, 2018) Restrepo Giraldo, Jorge Andrés; Velásquez Montoya, MarcelaThis article explains the experiences of the implementation of a decision support method in product/service design processes -- The research focuses on the utilization of a heuristic based method, as a tool to integrate adoption of innovation criteria to product design development phases -- All of this, with the objective to enhance the adoption of product/service solutions in social innovation driven projects and support conceptual exploration, providing more detailed information about the relationship between context, user, and product in early stages of the process -- Finally, this article is centered on an exploratory validation of the method by the development of two design cases to evaluate the assistance in a conducted design processÍtem Acerca de la mejor selección de una reserva en un sistema serie(Universidad EAFIT, 2018) Toloza Gordillo, Erika Eliana; Corujo, Josué M.; Valdés, José EnriqueÍtem Acerca de la mejor ubicación de reservas pasivas en un sistema serie de dos componentes(Universidad EAFIT, 2018) Gómez Cortés, Christian Yamir; Valdés Castro, José EnriqueÍtem Acercando el Branding y la UX : una herramienta para la selección de métodos(Universidad EAFIT, 2023) Gómez Rodríguez, Natalia; Maya Castaño, Jorge Hernán