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Biological effects of a copper-based fungicide on the fruit fly, drosophila melanogaster
No full textThe increased consumption of pesticides can have a negative environmental impact by increasing the essential metals to toxic levels. Bordasul® is a commonly used fungicide in Brazil and it is composed of 20% Cu, 10% sulfur, and 3.0% calcium. The study of fungicides in vivo in non-target model organisms can predict their environmental impact more broadly. The Drosophila melanogaster is a unique model due to its ease of handling and maintenance. Here, the potential toxicity of Bordasul® was investigated by assessing the development, survival, and behavior of exposed flies. Exposure to Bordasul® impaired the development (p < 0.01) and caused a significant reduction in memory retention (p < 0.05) and locomotor ability (p < 0.001). Fungicides are needed to assure the world’s food demand; however, Bordasul® was highly toxic to D. melanogaster. Therefore, Bordasul® may be potentially toxic to non-target invertebrates and new environmentally-safe biofertilizers have to be developed to preserve the biota
Adsorption of the rare earth elements cerium, lanthanum, and neodymium onto ZSM-5 zeolite: A statistical physics approach
No full textThe recovery of rare earth elements (REE) is essential to meet the growing demand for these resources and promote the reuse of available resources. This study investigated the potential of ZSM-5 zeolite in the recovery of trivalent ions of cerium, lanthanum and neodymium under conditions of pH 6 and temperatures between 298 and 328 K. REE equilibrium isotherms were analyzed using five statistical physics models. The results indicate that removing all REE occurs predominantly in monolayers, as these models showed better prediction performance (coefficient of determination > 0.97 and mean squared error cerium > lanthanum. The adsorption energies indicate that the process occurred mainly due to physical forces since all energy values are below 40 kJ mol−1. The study’s results led to the proposal of a mechanism for the adsorption of REE on ZSM-5 zeolite, which highlights the predominance of electrostatic interactions and complex formation, which result in the formation of a monolayer on the adsorbent’s surface
Percepciones y preferencias de los usuarios respecto a la propuesta de ceremonias temáticas en los servicios funerarios
No full textEste proyecto tuvo como objetivo analizar las percepciones de los usuarios respecto a la propuesta de ceremonias temáticas en los servicios funerarios. Se basó en una metodología mixta que incluyó instrumentos cuantitativos y cualitativos para tener mayor profundidad en los resultados. Desde lo cuantitativo se utilizó un cuestionario aplicado a 273 afiliados ubicados en las ciudades de Barranquilla, Riohacha y Valledupar; por su parte, desde lo cualitativo se realizó un grupo focal con 10 participantes de la ciudad de Barranquilla. El valor percibido de las ceremonias temáticas varía entre los afiliados, con algunos valorando la personalización y el soporte emocional, mientras que otros son escépticos sobre sus beneficios frente a los servicios tradicionales. Las preferencias revelan una inclinación hacia la personalización y la integración tecnológica, especialmente entre los jóvenes, mientras que los mayores prefieren aspectos tradicionales. Para diseñar ceremonias efectivas, es crucial ofrecer paquetes flexibles y accesibles que permitan la personalización y el uso de tecnología, complementados con campañas educativas que destaquen sus beneficios a través de testimonios específicos, asegurando así una experiencia satisfactoria para todos los clientes.This project aimed to analyze users' perceptions regarding the proposal of themed ceremonies in funeral services. It was based on a mixed methodology that included both quantitative and qualitative instruments to gain deeper insights into the results. Quantitatively, a questionnaire was administered to 273 affiliates located in the cities of Barranquilla, Riohacha, and Valledupar; qualitatively, a focus group was conducted with 10 participants from the city of Barranquilla. The perceived value of themed ceremonies varies among affiliates, with some appreciating the personalization and emotional support, while others remain skeptical about their benefits compared to traditional services. Preferences reveal a tendency towards personalization and technological integration, especially among younger individuals, while older adults tend to prefer traditional aspects. To design effective ceremonies, it is crucial to offer flexible and affordable packages that allow for personalization and the use of technology, complemented by educational campaigns that highlight their benefits through specific testimonials, thus ensuring a satisfying experience for all customers.Lista de tablas 7 -- Capítulo I: problemática 8 -- Planteamiento del problema 8 -- Objetivos de la investigación 14 -- Justificación de la investigación 15 -- Delimitación de la investigación 17 -- Capítulo II: perspectiva teórica 18 -- Estudios previos 18 -- Desarrollo teórico de conceptos clave 21 -- Operacionalización de conceptos 26 -- Capítulo III: metodología del proyecto 32 -- Enfoque de investigación 32 -- Diseño de la investigación 32 -- Población objeto de estudio 34 -- Muestra seleccionada 35 -- Técnicas de recolección de información 37 -- Capítulo IV: resultados de la investigación 44 -- Conclusiones 63 -- Referencias 65Magíster en Gestión de MercadeoMaestrí
Designing energy-efficient buildings in urban centers through machine learning and enhanced clean water managements
No full textRainwater Harvesting (RWH) is increasingly recognized as a vital sustainable practice in urban environments, aimed at enhancing water conservation and reducing energy consumption. This study introduces an innovative integration of nano-composite materials as Silver Nanoparticles (AgNPs) into RWH systems to elevate water treatment efficiency and assess the resulting environmental and energy-saving benefits. Utilizing a regression analysis approach with Support Vector Machines (SVM) and K-Nearest Neighbors (KNN), this study will reach the study objective. In this study, the inputs are building attributes, environmental parameters, sociodemographic factors, and the algorithms SVM and KNN. At the same time, the outputs are predicted energy consumption, visual comfort outcomes, ROC-AUC values, and Kappa Indices. The integration of AgNPs into RWH systems demonstrated substantial environmental and operational benefits, achieving a 57% reduction in microbial content and 20% reductions in both chemical usage and energy consumption. These improvements highlight the potential of AgNPs to enhance water safety and reduce the environmental impact of traditional
water treatments, making them a viable alternative for sustainable water management. Additionally, the use of a hybrid SVM-KNN model effectively predicted building energy usage and visual comfort, with high accuracy and precision, underscoring its utility in optimizing urban building environments for sustainability and comfort
An empirical analysis of learning styles and generic competencies in university students: case of health services administration students in the city of Barranquilla, Colombia
No full textThe objective of the study is to determine the relationship between learning styles and the development of generic competencies in Health Services Administration students; through a correlational study, in a population of 170 Health Services Administration students in the city of Barranquilla. For learning styles, Kolb's learning styles instrument was used; and for generic competencies, a standardized test designed under the methodology of the Evidence-Based Model and oriented to monitor the development of critical reading, written communication, citizenship competencies, quantitative reasoning and English. The resulting data were organized in a spreadsheet and processed using Statgraphics and R software. The results show that there is a strong relationship between divergent style and written communication, resulting from diversity in their concrete and reflective approach
Sistema de gestión del conocimiento para instituciones de educación superior. Caso Corporación Universidad de la Costa-CUC
No full textIn the current business environment, knowledge has become a fundamental strategic asset for the success and competitiveness of organizations. The ability to acquire, create, store, share, and apply knowledge effectively has become crucial for innovation, continuous learning, and informed decision-making. It is in this context that the need arises to develop and apply a knowledge management model that allows organizations to maximize the value of their collective intellect. This research proposes a knowledge management model with a comprehensive and systematic structure to address the challenges associated with managing intangible assets within an organization. This model is based on the premise that knowledge, when managed efficiently, becomes a driver of innovation and competitive advantage. By focusing on aspects such as acquisition, creation, storage, transfer, and application of knowledge, this model aims to provide a practical and effective guide for organizations seeking to optimize their knowledge management processes. To achieve this, a descriptive scope research was proposed, with the objective of identifying and describing the characteristics of knowledge management in the Higher Education Institution (HEI) under study and promoting mechanisms to appropriate the relevant knowledge that allows achieving greater competitiveness in the sector. Under a methodology consisting of identification, analysis, and design of a knowledge management model proposal. This research will be conducted through a descriptive scope, under a positivist paradigm, with a quantitative approach and a non-experimental, cross-sectional design. To obtain the results, a research tool such as a survey was used, where results were obtained that allowed highlighting the need for the model to implement a set of mechanisms to systematize the acquisition and transfer of knowledge within the university. Creating and fostering spaces for continuous feedback that allows the dissemination of ideas, innovative practices, and research findings, which will enrich not only the application of knowledge but also drive the professional growth of participants. Similarly, developing effective strategies to improve the dissemination of publications and other knowledge products generated by the University, among other results. Therefore, it is concluded that the Knowledge Management Model for the HEI should integrate continuous feedback as a key to identifying areas for improvement, fostering interdisciplinary collaboration, and strengthening the intellectual fabric. Likewise, developing effective strategies to improve the dissemination of publications and other knowledge products generated by the university. The goal is to create an environment conducive to innovation, skill development, and optimization of collective knowledge. This, in turn, will strengthen its position as a leading institution in higher education and in the generation of high quality knowledge, which is essential for academic and scientific progressEn el entorno empresarial actual, el conocimiento se ha convertido en un activo estratégico fundamental para el éxito y la competitividad de las organizaciones. La capacidad de adquirir, crear, almacenar, compartir y aplicar conocimiento de manera efectiva se ha vuelto crucial para la innovación, el aprendizaje continuo y la toma de decisiones acertadas. Es en este contexto, que surge la necesidad de desarrollar y aplicar un sistema de gestión del conocimiento que permitan a las organizaciones maximizar el valor de su intelecto colectivo. El presente trabajo de investigación propone un sistema de gestión del conocimiento con una estructura integral y sistemática para abordar los desafíos asociados con la gestión de activos intangibles en las instituciones de educación superior. Este sistema se basa en la premisa que el conocimiento, cuando es gestionado de manera eficiente, se convierte en un motor impulsor de la innovación y la ventaja competitiva. Al enfocarse en aspectos como la adquisición, creación, almacenamiento, transferencia y aplicación del conocimiento, este sistema busca proporcionar una guía práctica y efectiva para las organizaciones que buscan optimizar sus procesos de gestión del conocimiento. Para lograrlo se planteó una investigación de alcance descriptivo para identificar y describir las características de la gestión del conocimiento en la Institución Educativa Superior (IES de ahora en adelante) en estudio y promover mecanismos para apropiar conocimientos relevantes que permitan alcanzar mayor competitividad en el sector. Bajo una metodología constituida por la identificación, análisis y diseño de propuesta de sistema de gestión del conocimiento. El presente trabajo de investigación se realizará mediante una investigación de alcance descriptivo, bajo un paradigma positivista, con un enfoque cuantitativo y diseño no experimental, transaccional. Para obtener resultados se realizó la aplicación de un instrumento, donde se obtuvieron resultados que permitieron evidenciar que el sistema permita implementar mecanismos para sistematizar la adquisición y transferencia de conocimientos en la universidad. Generar y crear espacios de retroalimentación continua que permita la divulgación de ideas, prácticas innovadoras y hallazgos de investigación, lo que enriquecerá no solo la aplicación del conocimiento, sino también impulsará el crecimiento profesional de los participantes. Así mismo, desarrollar estrategias efectivas para mejorar la difusión de publicaciones y otros productos del conocimiento generados por la Universidad. Entre otros resultados. Por tanto, se concluye que el Sistema de gestión de conocimiento para la IES deberá integrar la retroalimentación continua como clave para identificar áreas de mejora, fomentar la colaboración interdisciplinaria y fortalecer el tejido intelectual. De igual forma, desarrollar estrategias efectivas para mejorar la difusión de publicaciones y otros productos del conocimiento generados por la universidad. Con esto se pretende crear un entorno propicio para la innovación, el desarrollo de habilidades, y la optimización de los conocimientos colectivos. Esto, a su vez, fortalecerá su posición como una institución líder en educación superior y en la generación de conocimiento de alta calidad, que es fundamental para el progreso académico y científico.Lista de tablas y figuras 10 – Introducción 11 -- Capítulo I 13 -- Planteamiento del Problema de Investigación 13 -- Descripción del Problema 13 -- Formulación del Problema 19 -- Objetivos Investigativos 20 -- Objetivo General 20 -- Objetivos Específicos 20 -- Justificación de la Investigación 21 -- Delimitación del Estudio 23 -- Alcance del Estudio 24 -- Relevancia, Pertinencia y Factibilidad 25 -- Mapa General de la Investigación 26 -- Marco Teórico 31 – Conocimiento 32 – Gestión 32 -- Gestión del Conocimiento 32 -- Tipos de Gestión del Conocimiento 34 --Sistemas de Gestión del Conocimiento 35 -- Sistemas de Gestión del Conocimiento en Instituciones de Educación Superior 39 -- Antecedentes de la Investigación 44 -- Marco Conceptual 47 -- Sistema de Variables 49 -- Nivel de Medición de la Variable 50 -- Operacionalización de la Variable 49 -- Marco Metodológico 55 -- Paradigma de la Investigación 55 -- Tipo de Investigación 56 -- Área de Investigación 57 – Método 57 – Enfoque 58 – Resultados 75 -- Conclusiones y recomendaciones 96 – Referencias 102 --Magíster en AdministraciónMaestrí
Clustering and principal component analysis for the characterization of corporate governance in family businesses
No full textFamily-origin companies have a fundamental importance in the business fabric and significantly contribute to the Colombian national economy. However, the present study aims to understand the characterization of Corporate Governance in family businesses in the city of Barranquilla. This research establishes the scope of characterizing Corporate Governance in family businesses in Barranquilla. For this purpose, a descriptive methodology is constructed and framed within exploratory information analysis through cluster analysis and Principal Component Analysis. As relevant findings of the research, three profiles were identified in the study population with a Silhouette indicator of 0.496: the first profile has room for improvement in all dimensions due to low consolidation compared to the other profiles; the second profile has strength in good governance and selection policy but opportunities for improvement in other variables; and finally, the third profile has strength in all dimensions. These family businesses must define roles and apply Corporate Governance to achieve stability and understanding of subsystems, impacting the economy and family cohesio
Relación entre el tipo, frecuencia e intensidad de actividad física y el nivel de estrés de los estudiantes universitarios en Barranquilla
No full textEn el contexto actual, se ha destacado la importancia de la actividad física para la salud física y mental. Diversas investigaciones han demostrado que niveles más altos de actividad física se vinculan con un mayor bienestar y una menor incidencia de síntomas depresivos, ansiedad y estrés. A pesar de esto, existe una escasez de estudios específicos que aborden la relación entre la actividad física y el estrés en estudiantes universitarios, especialmente en la población de psicología. Esta investigación se centra en explorar la relación entre el tipo, frecuencia e intensidad de la actividad física y el nivel de estrés en estudiantes universitarios de Barranquilla. Se evidencia la falta de investigaciones experimentales en el ámbito nacional, lo que destaca la necesidad de abordar esta brecha de conocimiento. La metodología propuesta es de enfoque positivista cualitativo, utilizando un diseño correlacionar. La muestra se seleccionará de manera representativa, incluyendo estudiantes de diversas instituciones educativas y programas académicos en Barranquilla. La recolección de datos se llevará a cabo mediante el inventario de SISCO, evaluando el tipo de ejercicio preferido, el tiempo dedicado a la actividad física y el nivel de estrés percibido. Por otro lado, buscamos contribuir al entendimiento de cómo la actividad física puede influir en los niveles de estrés en estudiantes universitarios, especialmente en un contexto postpandémico. Se espera que los resultados obtenidos proporcionen información valiosa para el diseño de políticas de bienestar y programas de intervención específicos para esta población en Barranquilla, llenando así un vacío en la literatura científica local.In the current context, the importance of physical activity for physical and mental health has been highlighted. Various research has shown that higher levels of physical activity are linked to greater well-being and a lower incidence of depressive symptoms, anxiety and stress. Despite this, there is a paucity of specific studies addressing the relationship between physical activity and stress in university students, especially in the psychology population. This research focuses on exploring the relationship between the type, frequency and intensity of physical activity and the level of stress in university students in Barranquilla. The lack of experimental research at the national level is evident, highlighting the need to address this knowledge gap. The proposed methodology is a qualitative positivist approach, using a correlational design. The sample will be selected in a representative manner, including students from various educational institutions and academic programs in Barranquilla. Data collection will be carried out through surveys and questionnaires, evaluating the preferred type of exercise, the time dedicated to physical activity and the level of perceived stress. On the other hand, we seek to contribute to the understanding of how physical activity can influence stress levels in university students, especially in a post-pandemic context. It is expected that the results obtained will provide valuable information for the design of well-being policies and specific intervention programs for this population in Barranquilla, thus filling a gap in the local scientific literature.Lista de tablas 9 -- Planteamiento del problema 12 -- Definición del problema12 -- Formulación de la pregunta problema14 -- Objetivos 14 -- Objetivo general 14 -- Objetivo específicos14 -- Justificación 14 -- Marco teórico 18 -- Antecedentes 18 -- Fundamentación teórica 21 -- Hipótesis 21 -- Metodología 22 -- Población y muestra 22 -- Instrumentos y técnicas23 -- Inventario de SISCO 23 -- Procedimiento 27 -- Proceso para la recolección de la muestra 27 -- Resultados 29 -- Datos sociodemográficos 29 -- Discusión 48 -- Recomendaciones 49 -- Conclusiones 50 -- Referencias 51 -- Anexos 56PsicologíaPregrad
An AI-based multiphase framework for improving the mechanical ventilation availability in emergency departments during respiratory disease seasons: a case study
No full textBackground Shortages of mechanical ventilation have become a constant problem in Emergency Departments (EDs), thereby affecting the timely deployment of medical interventions that counteract the severe health complications experienced during respiratory disease seasons. It is then necessary to count on agile and robust methodological approaches predicting the expected demand loads to EDs while supporting the timely allocation of ventilators. In this paper, we propose an integration of Artificial Intelligence (AI) and Discrete-event Simulation (DES) to design effective interventions ensuring the high availability of ventilators for patients needing these devices. Methods First, we applied Random Forest (RF) to estimate the mechanical ventilation probability of respiratoryaffected patients entering the emergency wards. Second, we introduced the RF predictions into a DES model to diagnose the response of EDs in terms of mechanical ventilator availability. Lately, we pretested two different interventions suggested by decision-makers to address the scarcity of this resource. A case study in a European hospital group was used to validate the proposed methodology. Results The number of patients in the training cohort was 734, while the test group comprised 315. The sensitivity of the AI model was 93.08% (95% confidence interval, [88.46 −96.26%]), whilst the specificity was 85.45% [77.45 −91.45%]. On the other hand, the positive and negative predictive values were 91.62% (86.75 −95.13%) and 87.85% (80.12 −93.36%). Also, the Receiver Operator Characteristic (ROC) curve plot was 95.00% (89.25 −100%). Finally, the median waiting time for mechanical ventilation was decreased by 17.48% after implementing a new resource capacity strategy. Conclusions Combining AI and DES helps healthcare decision-makers to elucidate interventions shortening the waiting times for mechanical ventilators in EDs during respiratory disease epidemics and pandemics
Deep convolutional neural network for weld defect classification in radiographic images
No full textThe quality of welds is critical to the safety of structures in construction, so early detection of irregularities is crucial. Advances in machine vision inspection technologies, such as deep learning models, have improved the detection of weld defects. This paper presents a new CNN model based on ResNet50 to classify four types of weld defects in radiographic images: crack, pore, non-penetration, and no defect. Stratified cross-validation, data augmentation, and regularization were used to improve generalization and avoid over-fitting. The model was tested on three datasets, RIAWELC, GDXray, and a private dataset of low image quality, obtaining an accuracy of 98.75 %, 90.255 %, and 75.83 %, respectively. The model proposed in this paper achieves high accuracies on different datasets and constitutes a valuable tool to improve the efficiency and effectiveness of quality control processes in the welding industry. Moreover, experimental tests show that the proposed approach performs well on even low-resolution images