Reconocimiento automático de ganado bovino a partir de imágenes aéreas tomadas con drones: Un enfoque exploratorio.

El sector ganadero en Colombia se ha visto afectado en los últimos años por el aumento del robo de ganado bovino generando pérdidas millonarias para el gremio. La ganadería en el país se realiza por pastoreo extensivo lo que hace difícil de monitorear los animales en tiempo real. En este trabajo se propuso una primera fase hacia la construcción de un sistema para la vigilancia automática de ganado a cielo abierto, mediante la adquisición de imágenes aéreas tomadas con drones. Para llevarlo a cabo, se tomaron alrededor de 13000 fotografías de ganado en cuatro fincas del oriente antioqueño, se etiquetaron manualmente y se construyó un modelo para la detección de ganado a partir de una arquitectura de redes neuronales profundas llamada YOLO. En las métricas de evaluación de desempeño del modelo entrenado, se obtuvieron valores de precisión del 82% con niveles de sensibilidad del 75% en etapas de prueba y validación. A pesar de que el estudio planteado es de tipo exploratorio, los resultados obtenidos muestran el potencial de utilizar este tipo de herramientas en la construcción de una aplicación funcional para la prevencióndel robo de ganado en Colombia

Factores relacionados con la recuperación de la capacidad funcional en mujeres con cáncer de mama: revisión sistemática

The objective of this review was to consolidate the available evidence about the factors related to the re-covery of functional capacity (FC) in women with breast cancer, based the PRISMA declaration criteria. The qua-lity of the studies was assessed using the New Castle Ottawa and JADAD scales. 11 studies were included: se-ven experimental and four cohort follow-ups. Psycholo-gical, clinical, and treatment factors related to FC reco-very, were identified. However, some results come from studies with low methodological quality. Additionally, the findings are not comparable because they were evaluated using different instruments. In conclusion, the recovery of FC to require considering individual and interventions factors, as psychological well-being and early rehabilitation. Is necessary to standardize the ins-truments to evaluate FC in women with breast cancer, and to increase the quality of the research about this topicEl objetivo de esta revisión fue consolidar la evidencia disponible sobre los factores relacionados con la recuperación de la capacidad funcional (CF) en mujeres con cáncer de mama de acuerdo a los criterios de la declaración de PRISMA. La calidad de los estudios se evaluó utilizando las escalas New Castle Ottawa y JADAD. Se incluyeron 11 estudios: 7 experimentales y 4 seguimientos de cohortes. Identificamos factores psicológicos, clínicos y de tratamiento relacionados con la recuperación de CF, sin embargo, algunos resultados provienen de estudios con baja calidad metodológica. Además, los resultados no son comparables, porque fueron evaluados utilizando diferentes instrumentos. En conclusión, la recuperación de la FC requiere considerar factores individuales y de intervención, como el bienestar psicológico y la rehabilitación temprana, pero es necesario estandarizar los instrumentos para evaluar la CF en mujeres con cáncer de mama y aumentar la calidad de la investigación sobre este temaActividad Física y Deport

Memorias de investigación: Feria de Semilleros y Jornadas de Investigación de UNIMINUTO, Seccional Antioquia - Chocó.

Esta publicación busca divulgar investigaciones y producción académica en diferentes disciplinas, realizadas por estudiantes y docentes de UNIMINUTO Seccional Antioquia – Chocó, así como dar a conocer a los semilleros de investigación que participaron en la VI Feria de Semilleros, con el fin de visibilizar el trabajo que realiza el Centro de Investigación para el Desarrollo de UNIMINUTO Bello —CIDUB—, con respecto a debates académicos y espacios de interlocución

Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV

A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe

Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at root s=13 TeV

A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb(-1) collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on themodel, the combined result excludes a top squarkmass up to 1325 GeV for amassless neutralino, and a neutralinomass up to 700 GeV for a top squarkmass of 1150 GeV. Top squarks with masses from 145 to 295 GeV, for neutralino masses from 0 to 100 GeV, with a mass difference between the top squark and the neutralino in a window of 30 GeV around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420 GeV

Measurement of the W gamma Production Cross Section in Proton-Proton Collisions at root s=13 TeV and Constraints on Effective Field Theory Coefficients

A fiducial cross section for W gamma production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in 137 fb(-1) of data collected using the CMS detector at the LHC. The W -> e nu and mu nu decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.Peer reviewe

Measurement of B-c(2S)(+) and B-c*(2S)(+) cross section ratios in proton-proton collisions at root s=13 TeV

Peer reviewe

Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at root s=13 TeV

Peer reviewe

Performance of the CMS muon trigger system in proton-proton collisions at √s = 13 TeV

The muon trigger system of the CMS experiment uses a combination of hardware and software to identify events containing a muon. During Run 2 (covering 2015-2018) the LHC achieved instantaneous luminosities as high as 2 × 10 cm s while delivering proton-proton collisions at √s = 13 TeV. The challenge for the trigger system of the CMS experiment is to reduce the registered event rate from about 40 MHz to about 1 kHz. Significant improvements important for the success of the CMS physics program have been made to the muon trigger system via improved muon reconstruction and identification algorithms since the end of Run 1 and throughout the Run 2 data-taking period. The new algorithms maintain the acceptance of the muon triggers at the same or even lower rate throughout the data-taking period despite the increasing number of additional proton-proton interactions in each LHC bunch crossing. In this paper, the algorithms used in 2015 and 2016 and their improvements throughout 2017 and 2018 are described. Measurements of the CMS muon trigger performance for this data-taking period are presented, including efficiencies, transverse momentum resolution, trigger rates, and the purity of the selected muon sample. This paper focuses on the single- and double-muon triggers with the lowest sustainable transverse momentum thresholds used by CMS. The efficiency is measured in a transverse momentum range from 8 to several hundred GeV