Universidad Tecnológica de Bolívar
Repositorio UTB (Universidad Tecnológica de Bolívar)Not a member yet
11796 research outputs found
Sort by
QCL infrared spectroscopy combined with machine learning as a useful tool for classifying acetaminophen tablets by brand
No full textThe development of new methods of identification of active pharmaceutical ingredients (API) is a subject of paramount importance for research centers, the pharmaceutical industry, and law enforcement agencies. Here, a system for identifying and classifying pharmaceutical tablets containing acetaminophen (AAP) by brand has been developed. In total, 15 tablets of 11 brands for a total of 165 samples were analyzed. Mid-infrared vibrational spectroscopy with multivariate analysis was employed. Quantum cascade lasers (QCLs) were used as mid-infrared sources. IR spectra in the spectral range 980–1600 cm−1 were recorded. Five different classification methods were used. First, a spectral search through correlation indices. Second, machine learning algorithms such as principal component analysis (PCA), support vector classification (SVC), decision tree classifier (DTC), and artificial neural network (ANN) were employed to classify tablets by brands. SNV and first derivative were used as preprocessing to improve the spectral information. Precision, recall, specificity, F1-score, and accuracy were used as criteria to evaluate the best SVC, DEE, and ANN classification models obtained. The IR spectra of the tablets show characteristic vibrational signals of AAP and other APIs present. Spectral classification by spectral search and PCA showed limitations in differentiating between brands, particularly for tablets containing AAP as the only API. Machine learning models, specifically SVC, achieved high accuracy in classifying AAP tablets according to their brand, even for brands containing only AAP
Navegando hacia una transformación significativa en la gerencia de proyectos a través del análisis de herramientas innovadoras de inteligencia artificial en el contexto actual
No full textMediante el presente artículo se ofrece un examen holístico sobre la importancia de comprender y aplicar la inteligencia artificial (IA) en la Gerencia de proyectos. En donde desde una perspectiva estratégica, se genera la evaluación minuciosa del impacto transformador que crea la Inteligencia Artificial en la eficiencia operativa, la toma de decisiones informada y los resultados finales de los proyectos. Adicionalmente mediante las lecciones aprendidas en diferentes autores, se destaca la implementación transcendental de la Inteligencia Artificial no solo en la optimización del recurso y tiempo, sino que también se enfatiza las características marcadas en el impulso de la innovación estratégica. Así mismo por medio del presente artículo no solo proporciona una visión crítica de la integración de la Inteligencia Artificial en la Gerencia de Proyectos respaldada por casos de estudios tangibles en algunas organizaciones que han apostado por este tipo de tecnologías, sino que también se resalta la importancia de la inteligencia artificial en un entorno empresarial dinámico y desafiante, contribuyendo de esta manera al progreso y la transformación de las prácticas actuales en esta disciplina
Looking back to move forward: shedding light on the dark side of entrepreneurship.
No full textPurpose – While entrepreneurship has long been heralded for its positive contributions, there is a growing
recognition of its “dark side,” characterized by unproductive, unethical and destructive actions. This
exploratory literature review aims to illuminate the underexplored dark side of entrepreneurship, thereby
enriching the discourse on entrepreneurship’s dual nature.
Design/methodology/approach – This study employs a robust mixed-method approach, integrating
phenomenologically detailed co-citation bibliographic coupling with detailed thematic data and code-weaving.
Science mapping tools like R-Bibliometrix and VOSviewer enhance the credibility of the findings by providing
a sophisticated and reproducible methodological framework.
Findings – This review defines dark entrepreneurship, its characteristics, and its complexities. We introduced
the “Dark Entrepreneurship Trinity”: Ethical Complexity, Institutional Navigation and Conflict
Entrepreneurialship, with Institutional Navigation as the apex theme. It elucidates how this theme influences
ethical dilemmas and operational strategies in conflict zones, illustrated through a diagram depicting their
complex interrelations and dynamics.
Originality/value – The originality of this literature review lies in its comprehensive synthesis of the dark
side of entrepreneurship. This review significantly contributes to the academic discourse by delineating a
clearer picture of the destructive potentials of entrepreneurship. It compiles existing research, critically
addresses the gaps and suggests future pathways for empirical studies
Revelando complejas interacciones entre el Índice de Desarrollo Humano y los Objetivos de Desarrollo Sostenible: Un análisis basado en el aprendizaje automático
No full textLos Objetivos de Desarrollo Sostenible, establecidos por la Organización de las Naciones Unidas en 2015, han surgido como un marco integral para evaluar el potencial de las naciones y sus sociedades para trazar un camino hacia la mejora de las vidas de las personas en todo el mundo, guiados por el principio de "no dejar a nadie atrás". Paralelamente, el Índice de Desarrollo Humano, desarrollado por el Programa de las Naciones Unidas para el Desarrollo, ha servido como una herramienta para clasificar a los países según su potencial para el desarrollo humano, asumiendo un escenario sin desigualdad. Este trabajo tiene como objetivo investigar la correlación entre estos dos índices mediante la aplicación de técnicas modernas de aprendizaje automático. Específicamente, se utilizan el coeficiente de correlación de Pearson y análisis de regresión lineal para examinar la relación entre los dos indicadores. Además, en esta investigación se exploran métodos de reducción de dimensionalidad, en particular, el algoritmo de aprendizaje automático UMAP.Magister en Estadística AplicadaMaestrí
Novabot: a mini-blimp dedicated to stage recording
No full textDuring a second-year internship at the Georges Charpak Provence campus of Mines SaintÉtienne, located in Gardanne, Provence, I collaborated with a final-year master’s engineering student, Thibault Langlart, within the Novabot project. This project aimed to integrate a floating drone called the "ID-FLY airship" into theatrical applications to provide a unique perspective of performance scenes. Working at the ID-Fab facility under the supervision of research engineer Francois Bernier and Dr. Julien Serres, we focused on automating the drone’s behavior to maintain a fixed distance from artists on stage. Our tasks included implementing the ROS framework on a Raspberry Pi, adapting the Luxonis AI camera as a position sensor, creating a dynamic model, and developing the flight control system. Additionally, we contributed to an artistic demonstration led by Ph.D. student Yousra Mansar, who is conducting artistic research as part of her thesis at LESA in Aix-en-Provence.Ingenireo MecatrónicoPregrad
Warmth in the Doctor-Patient Relationship: Analysis of the Effect of Empathy as a Mediating Variable in the Patient's Intention to Adhere to Treatment
No full textLa relación médico-paciente ha sido identificada a lo largo del tiempo como una de las claves del éxito del tratamiento médico y ha sido estudiada en contextos europeos, norteamericanos y latinoamericanos con condiciones socioeconómicas, educativas y culturales particulares. Esta investigación ofrece una nueva perspectiva acerca del asunto. En ella se ha elaborado un modelo para las variables que inciden en la intención de adherencia al tratamiento y los efectos directos e indirectos que surgen en tal relación a partir de un estudio experimental. La metodología incluyó un diseño aleatorio de dos grupos, con una muestra de 440 participantes, de los cuales 80 correspondieron a la validación de la manipulación de las variables independientes en las narraciones creadas, 150 a la prueba piloto y 210 a la situación experimental, de una población de estudiantes universitarios. El modelo emergente reveló la relación directamente proporcional entre la calidez del médico y la intención de adherencia al tratamiento. Los resultados evidencian, además, el papel mediador de la empatía como predictora de la conducta de adherencia al tratamiento y la concentración del mayor peso en el componente cognitivo de la empatía, asociado a estos resultados. Los predictores significativos del modelo confirman que la relación médico-paciente es un claro ejemplo de heterogeneidad, en la que confluyen multitud de pacientes y médicos con características diversas, lo que hace única cada interacción, que se muestra más compleja y multicausal que lo estudiado hasta el momento.The doctor-patient relationship has been identified over time as a key to
the success of medical treatment. It has been explored in European, North
American, and Latin American contexts with particular socioeconomic,
educational, and cultural conditions. This research offers a new perspective on the matter. A model has been developed for the variables influencing the intention to adhere to treatment and the direct and indirect effects
of such a relationship through an experimental study. The method involved
a random design of two groups of university students, with a sample of 440
participants: 80 to validate the manipulation of the independent variables
in the created narratives, 150 for the pilot test, and 210 for the experimental situation. The emerging model revealed a directly proportional relationship between physician warmth and intention to adhere to treatment. The
results also show the mediating role of empathy as a predictor of treatment
adherence behavior and the concentration of greatest weight on the cognitive component of empathy. The significant predictors of the model confirm
that the doctor-patient relationship is a clear example of heterogeneity, in
which many patients and physicians with diverse characteristics come together and make each interaction unique,Universidad Tecnológica de Boliva
Rapid Mapping of Waterbody Variations in the Central Rift Valley, Ethiopia, Using the Digital Earth Africa Open Data Cube
No full textMapping waterbodies variations through time is only possible thanks to the use of in-situ hydrometric sensors or remotely sensed data. Few areas around the world count with a functional in-situ sensor’s network, but all areas can be observed with satellite imagery. Several previous studies have mapped waterbodies by means of optical satellite imagery. Combining both optical and radar data is an alternative to avoid high cloud coverage or low data availability. This work presents a workflow for mapping waterbodies variations of lakes, spatially and temporally, located in the Central Rift Valley, Ethiopia by considering Landsat-based analysis-ready data alongside Sentinel-1/2 imagery, and comparing automatic thresholding methods. The workflow is simple, yet effective, and makes use of the Digital Earth Africa Open Data Cube, for the very first time in Ethiopia to accelerate time-series processing with the potential to extend this analysis to a national scale, addressing water security challenges
As redes sociais como lugares de memória: diálogos cidadãos através da fotografia no Facebook
No full textEl presente trabajo aborda la potencialidad de los social media como espacios de diálogo ciudadano en torno a la memoria y la identidad cultural de los territorios y sus habitantes. Desde la perspectiva de la antropología cultural y los estudios sobre la memoria, se presenta una investigación exploratoria basada en el análisis de contenido de dos grupos de Facebook vinculados a la ciudad de Cartagena de Indias (Colombia), acompañados de entrevistas cualitativas con sus administradores y con historiadores del territorio. Los resultados explican algunos de los factores que contribuyen a la popularidad de estos grupos virtuales, basados en el uso de la fotografía vernácula, y evidencian cómo han llegado a complementar o sustituir funciones que antaño estaban restringidas a las instituciones públicas y académicas, los museos y los archivos. Se concluye que, pese a sus limitaciones, estos grupos, nacidos en un contexto histórico y tecnológico determinado, constituyen importantes lugares virtuales de la memoria.This paper addresses the potential of social media as places for citizen dialogue around
memory and cultural identity of territories and their inhabitants. From the perspective of
cultural anthropology and memory studies, an exploratory research is presented based
on the content analysis of two Facebook groups linked to the city of Cartagena de Indias
(Colombia), accompanied by qualitative interviews with their administrators and with
historians of the territory. The results explain some of the factors that contribute to the
popularity of these virtual groups, based on the use of vernacular photography, and show
how digital social networks have come to complement or replace functions that were
once restricted to public and academic institutions, museums and archives. It is concluded
that, despite their limitations, these groups, born in a specific historical and technological
context, constitute important virtual places of memory.Este artigo aborda o potencial das mídias sociais como lugares de diálogo cidadão
em torno da memória e identidade cultural dos territórios e de seus habitantes. Na
perspectiva da antropologia cultural e dos estudos de memória, apresenta-se uma
pesquisa exploratória a partir da análise de conteúdo de dois grupos do Facebook
vinculados à cidade de Cartagena das Índias (Colômbia), acompanhada de entrevistas
qualitativas com seus administradores e com historiadores do território. Os resultados
explicam alguns dos fatores que contribuem para a popularização desses grupos virtuais,
baseados no uso da fotografia vernacular, e mostram como as redes sociais digitais
passaram a complementar ou substituir funções que antes eram restritas a instituições
públicas e acadêmicas, museus e arquivos. Conclui-se que, apesar de suas limitações,
esses grupos, nascidos em um contexto histórico e tecnológico específico, constituem
importantes lugares virtuais de memória.Introducción
Materiales y métodos
Resultados
Discusión
Referencia
Applied investigation of methyl, ethyl, propyl, and butyl mercaptan as potential poisons in the gas phase polymerization reaction of propylene
No full textThe polypropylene (PP) synthesis process is crucial in the plastics industry, requiring precise control as it directly impacts the catalytic activity and the final product’s performance. This study investigates the effects of trace amounts of four different mercaptans on the polymerization of propylene using a fourth-generation Ziegler–Natta (ZN) catalyst. Various concentrations of these mercaptans were tested, and results showed that their presence significantly reduced the melt flow index (MFI) of the final PP. The most notable MFI decrease occurred at 37.17 ppm of propyl mercaptan and 52.60 ppm of butyl mercaptan. Methyl and ethyl mercaptan also reduced the MFI at lower concentrations, indicating that mercaptans act as inhibitors by slowing down the polymerization process and reducing the fluidity of molten PP. The highest MFI increase was observed at lower concentrations of each mercaptan, suggesting that smaller molecular inhibitors require less concentration. This trend was also seen in the catalyst’s productivity, where lower concentrations of methyl mercaptan reduced PP production more effectively than higher concentrations of butyl mercaptan. Fourier transform infrared spectroscopy (FTIR) identified interactions between the mercaptans and the ZN catalyst. Computational analysis further supported these findings, providing insights into the molecular interactions and suggesting possible inhibition mechanisms that could impact the final properties of polypropylene.Universidad Tecnológica de Bolivar, Universidad de Cartagena, Universidad de la Cost
Consumo de anime na população universitária de Cartagena
No full textEsta investigación presenta un análisis sobre el consumo de anime en la población universitaria
de Cartagena (Colombia). Se encontró que la mayoría de los participantes conciben este tipo de
animación japonesa como una guía para su propia vida; se identifican con las historias, protagonistas
y los valores de la responsabilidad, perseverancia, espíritu luchador y amistad, que caracterizan a
estas producciones.This research presents an analysis on anime consumption in the university population of Cartagena
(Colombia). It was found that most of the participants conceive this type of Japanese animation as
a guide for their own life; they identify with the stories, protagonists and the values of responsibility,
perseverance, a fighting spirit and friendship that characterize these productionsEsta pesquisa apresenta uma análise sobre o consumo de anime na população universitária de
Cartagena (Colômbia). Verificou-se que a maioria dos participantes concebe este tipo de animação
japonesa como um guia para sua própria vida; identificam-se com as histórias, protagonistas e
valores de responsabilidade, perseverança, espírito de luta e amizade que caracterizam estas
produçõesUniversidad Tecnológica de Bolíva