Publicaciones
Repositorio Institucional
Navegar
Slide 1 of 5 Publicación Acceso Abierto
A Low Power Non-Invasive Wrist-Based Approach for Glucose Monitoring
(Springer, 2025-09-01) Tobar-Subia-Contento, Luz M.; Vargas Ramírez, Raúl Andrés; Romero Pérez, Lenny Alexandra; Contreras Ortiz, Sonia Helena; Grupo de Investigación Física Aplicada y Procesamiento de Imágenes y Señales- FAPIS; Semillero de Investigación en Visión Artificial
This study presents the development of a prototype noninvasive device for measuring blood glucose levels. It focuses on using photoplethysmography (PPG) and the Beer-Lambert law to measure the absorbance of infrared and red light through the skin of the wrist, offering an alternative to traditional invasive methods, such as commercial glucose meters. This device has the potential to provide a more convenient and less painful approach to continuous glucose monitoring. The study was conducted on a young population in Cartagena, Colombia, where participants used both the prototype device and a commercial glucose meter (Accu-Chek) to compare the results. The data obtained showed a moderate correlation between the two devices (Pearson correlation coefficient of 0.49), with most measurements located in zones A and B of the Parkes error grid, suggesting that the errors are clinically acceptable. However, it is noted that the results should be interpreted with caution in populations with extreme glucose levels. The study concludes that the non-invasive device meets clinical standards for glucose measurement, supporting its future development. It is suggested to move towards a miniaturized wearable device and conduct additional clinical studies to generate more data across a wide range of glucose levels, from hypoglycemia to hyperglycemia.
Slide 2 of 5 Publicación Acceso Abierto
Global complexity signatures of solar cycles: a unified entropy–fractal survey of OMNI solar wind data (1964–2025)
(2025) Sierra Porta, David; Canedo Verdugo, Maximiliano; Herrera Acevedo, Daniel David
Background — Traditional solar-cycle studies emphasize amplitude- and duration-based indicators, overlooking the intrinsic complexity of
heliospheric fluctuations. Entropy- and fractal-based descriptors offer complementary insight, but a cycle-resolved assessment across multiple
observables has been missing.
Methods—Using daily OMNI-2 data (1964–2025), we segment each solar cycle (20–25) into ascending and descending phases and compute
eleven global complexity measures per cycle–phase segment for ten solar-wind and geomagnetic observables. The metrics cover information content
(Shannon, spectral), dynamical regularity (approximate, sample, permutation), geometric roughness (Higuchi, Katz, Petrosian), algorithmic
novelty (Lempel–Ziv), and long-range memory (Hurst). We analyse redundancy and physical linkages via correlations and principal-component
analysis (PCA), and quantify within-cycle phase contrasts using paired nonparametric tests with bootstrap effect sizes. Cycle parity is tested with
permutation-based linear models controlling for the physical variable.
Results — Two orthogonal axes summarize the landscape: an amplitude–breadth direction (dominated by Shannon/spectral entropy) and
a temporal-irregularity direction (ordinal entropies and Higuchi), while Lempel–Ziv forms an almost independent third dimension. Crucially,
phase—not odd/even parity—organizes the dominant variability: ascending halves maximize multiscale roughness, whereas descending halves
show broader amplitude dispersion and higher algorithmic novelty. Cross-metric–observable maps tie these facets to known regimes: fast streams
and composition-rich intervals (e.g., larger ω/p) raise ordinal richness and LZ; storm-time geomagnetic response (Dst, Kp) aligns with antipersistence
and space-filling trajectories.
Slide 3 of 5 Publicación Acceso Abierto
El estado de necesidad como causal de ausencia de responsabilidad en el delito de fuga de presos: una revisión desde la normativa colombiana
(Revista de Direito, 2025-08-15) Benavides Herrera, Bryam Nicolás; Grupo de Investigación en Justicia Global (GIJUS)
En este artículo, producto de investigación, se analiza el estado de necesidad justificante como causal de ausencia de responsabilidad, aplicable a los eventos de evasiones carcelarias, desde una perspectiva del derecho penal como ciencia unitaria. Para esto, se estudia la tutela de la eficaz y recta impartición de justicia al interior de un Estado social y democrático de derecho, especialmente, sus implicaciones frente al estado de necesidad, cuando el contexto penitenciario impone peligros injustos a los derechos de los reclusos. La revisión de los requisitos de la causal permite ampliar su operatividad, mucho más allá de los casos, tradicionalmente, tratados por la doctrina mayoritaria.
Slide 4 of 5 Publicación Acceso Abierto
Urban mobility insights: a dataset for exploring network topology and city dynamics
(2025-09-23) Herrera Acevedo, D. D.; Sierra Porta, David
This article presents a comprehensive dataset capturing the urban network structures and
sociodemographic variables of 65 cities worldwide for the year 2023, based on the Urban Mobility
Readiness Index (UMRi) developed by the Oliver Wyman Forum. The dataset includes key metrics
such as graph entropy, node degree, clustering coefficient, graph diameter, GDP per capita, and
population density, among others, which are essential for analysing the relationship between
network topology and urban mobility readiness. By offering detailed insights into these urban
networks, this dataset serves as a valuable resource for cities not currently included in major
mobility rankings, allowing them to evaluate their mobility readiness in relation to established
indices like the UMRi. Urban planners and researchers can leverage this data to explore complex
urban mobility dynamics and develop strategies to enhance transportation systems, particularly in
rapidly growing or underserved regions. The dataset is structured for seamless integration with
various analytical tools, making it a vital asset for both urban planning and research aimed at
fostering sustainable and efficient urban development.
Slide 5 of 5
