1,510 research outputs found
Una Herramienta para la estimación del esfuerzo del estudiante de grado en ingeniería informática
En el marco de las nuevas titulaciones de Grado en
Ingeniería Informática, resulta muy conveniente
establecer algún tipo de mecanismo que nos permita
recoger información sobre la dedicación real de los
estudiantes a nuestras asignaturas. A nivel de asignatura,
esta información puede servir al profesorado
para determinar el grado de acierto de su planificación
temporal inicial. A un nivel más global, los datos
recogidos proporcionan a los coordinadores de curso
una idea de la carga total a la que está sometido el
estudiante, y contribuyen a la identificación de posibles
picos (o valles) de trabajo durante el cuatrimestre.
En este trabajo se describe la puesta en marcha de
un sistema, basado en encuestas, para el conocimiento
del esfuerzo de los estudiantes de Grado en Ingeniería
Informática de la Escuela Superior de Ingeniería
Informática de Albacete. También se presentan y
analizan algunos de los resultados obtenidos durante
el curso académico 2012/13.SUMMARY -- In the framework of new degrees in Computer Science,
it is desirable to establish some mechanism to
let us collect some information about our students'
commitment to our courses. On the subject level, this
information may be useful for the teaching staff to
determine the degree of success of this initial temporary
planning. In a high level point of view, the data
collected provide the course coordination with an
idea of the total workload of students and it contributes
to identify potential peaks (or valleys) of work
throughout the semester. This work presents a surveybased
system to obtain and register the efforts of our
Computer Engineering students from the School of
Computer Engineering of Albacete. It also introduces
and discusses some of the results obtained during the
academic year 2012/13
Comparison of machine learning algorithms for wildland-urban interface fuelbreak planning integrating ALS and UAV-Borne LiDAR data and multispectral images
Producción CientíficaControlling vegetation fuels around human settlements is a crucial strategy for reducing fire severity in forests, buildings and infrastructure, as well as protecting human lives. Each country has its own regulations in this respect, but they all have in common that by reducing fuel load, we in turn reduce the intensity and severity of the fire. The use of Unmanned Aerial Vehicles (UAV)-acquired data combined with other passive and active remote sensing data has the greatest performance to planning Wildland-Urban Interface (WUI) fuelbreak through machine learning algorithms. Nine remote sensing data sources (active and passive) and four supervised classification algorithms (Random Forest, Linear and Radial Support Vector Machine and Artificial Neural Networks) were tested to classify five fuel-area types. We used very high-density Light Detection and Ranging (LiDAR) data acquired by UAV (154 returns·m−2 and ortho-mosaic of 5-cm pixel), multispectral data from the satellites Pleiades-1B and Sentinel-2, and low-density LiDAR data acquired by Airborne Laser Scanning (ALS) (0.5 returns·m−2, ortho-mosaic of 25 cm pixels). Through the Variable Selection Using Random Forest (VSURF) procedure, a pre-selection of final variables was carried out to train the model. The four algorithms were compared, and it was concluded that the differences among them in overall accuracy (OA) on training datasets were negligible. Although the highest accuracy in the training step was obtained in SVML (OA=94.46%) and in testing in ANN (OA=91.91%), Random Forest was considered to be the most reliable algorithm, since it produced more consistent predictions due to the smaller differences between training and testing performance. Using a combination of Sentinel-2 and the two LiDAR data (UAV and ALS), Random Forest obtained an OA of 90.66% in training and of 91.80% in testing datasets. The differences in accuracy between the data sources used are much greater than between algorithms. LiDAR growth metrics calculated using point clouds in different dates and multispectral information from different seasons of the year are the most important variables in the classification. Our results support the essential role of UAVs in fuelbreak planning and management and thus, in the prevention of forest fires.Ministerio de Economía, Industria y Competitividad (DI-16-08446; DI-17-09626; PTQ-16-08411; PTQ- 16-08633)European Commission through the project ‘MySustainableForest’ (H2020-EO-2017; 776045
Exercise Training as a Treatment for Cardiometabolic Risk in Sedentary Adults: Are Physical Activity Guidelines the Best Way to Improve Cardiometabolic Health? The FIT-AGEING Randomized Controlled Trial
This 12-week randomized controlled trial investigates the effects of different training
modalities on cardiometabolic risk in sedentary, middle-aged adults, and examines whether alterations
in cardiometabolic risk are associated with changes in those health-related variables that are modifiable
by exercise training. The study subjects were 71 middle-aged adults (~54 years old; ~50% women)
who were randomly assigned to one of the following treatment groups: (1) no exercise (control
group), (2) concurrent training based on international physical activity recommendations (PAR group),
(3) high intensity interval training (HIIT) group, or (4) HIIT plus whole-body electromyostimulation
(HIIT+EMS group). A cardiometabolic risk score was calculated based on the International Diabetes
Federation’s clinical criteria. A significant reduction in cardiometabolic risk was observed for all
exercise training groups compared to the control group (all p < 0.05), which persisted after adjusting
potential confounders (all p < 0.05). However, the HIIT+EMS group experienced the most significant
reduction (p < 0.001). A significant inverse relationship was detected between the change in lean mass
and the change in cardiometabolic risk (p = 0.045). A 12-week exercise training programs-especially
the HIIT+EMS program-significantly reduced cardiometabolic risk in sedentary, middle-aged adults
independent of sex, age, and cardiorespiratory fitness.The study was supported by the Spanish Ministry of Education (FPU14/04172 and FPU15/03960), by the
University of Granada Plan Propio de Investigación 2016 (Excellence actions: Unit of Excellence on Exercise and
Health [UCEES]) and Plan Propio de Investigación 2019-Programa Contratos-Puente, by the Junta de Andalucía,
Consejería de Conocimiento, Investigación y Universidades, by the European Regional Development Fund
(ERDF), ref. SOMM17/6107/UGR and by Redes Temáticas de Investigación Cooperativa RETIC grant Red SAMID
RD16/0022
Characterization of third molars subjected to surgical extraction at the college of dentistry University of Antioquia between 1991 and 2001
ABSTRACT: To characterize the third molars extraction procedures performed at the operating room of the collage of Dentistry University of Antioquia, according to anatomical variables and radiographic analysis. Materials and methods: a descriptive retrospective observational study was carried out of 2120 extraction performed on 1072 patients attended between 1991 and 2001. Clinical records of patients with upper and lower third molars to whom surgery was performed with local anesthesia, high speed hand piece, and panoramic and periapical radiographic analysis were included. Results: According to the longitudinal axis of the third molar, 43.9% were vertical; according to the position of the molar with respect to the occlusal plane 41.6% of the third molars were found to be in position C; the periodontal compromise was of good prognosis in 61.5% of the cases, and on the lower third molars the most frequent classification of erupting space was type II (79.3%). The risk of impactation in the maxillary sinus was present in 34.2% of the cases. Intraoperative complications were rare. Conclusions: mesio angulated lower third molars below occlusal plane and without erupting space present the most complications, and even though they were performed by undergraduate dental students, these percentages are below the percentages reported wordwide.RESUMEN: Caracterizar los terceros molares sometidos a exodoncia quirúrgica en los quirófanos de la Facultad de Odontología de la Universidad de Antioquia según las variaciones anatómicas y el análisis radiográfico. Materiales y métodos. Se realizó un estudio observacional descriptivo retrospectivo de 2.120 exodoncias practicadas a 1.072 pacientes atendidos en el periodo 1.991 y 2.001. Se incluyeron las historias clínicas de pacientes con terceros molares superiores e inferiores a los que se les realizó cirugía con técnica de anestesia local, pieza de mano de alta velocidad y análisis radiográfico panorámico y periapical. Resultados. Según el eje axial del tercer molar, se encontraban verticales el 43,9%; según la posición del molar con respecto al plano oclusal, el 41,6% de los terceros molares se encontraba en posición C; el compromiso periodontal fue de buen pronóstico en el 61,5% de los casos y en los terceros molares inferiores la clasificación mas frecuente de espacio para erupcionar fue la tipo II (79,3%). El riesgo de impactación al seno maxilar se presentó en el 34,2% de los casos. Las complicaciones intraoperatorias fueron poco frecuentes. Conclusión. Los terceros molares inferiores mesioangulados, por debajo del plano oclusal y sin espacio para erupcionar son los que con mayor frecuencia se complican, y aun siendo realizados por los estudiantes del pregrado de odontología estos porcentajes están por debajo de los reportados mundialmente
La formación en conceptos en Educación Física: ¿qué saben los alumnos de educación primaria?
Esta investigación se centró en la exploración del grado de conocimiento de la población escolar española referido a conceptos básicos relacionados con la Educación Física y la salud. Se ha aplicado un cuestionario sobre aprendizaje de conceptos en Educación Física (CACEF) a los alumnos y alumnas de Educación Primaria, elaborado por expertos y por profesores en activo (validez de contenido). Se obtuvo una fiabilidad de Alfa de Cronbach (0.85), así como una correlación test-retest en la prueba piloto de 0.84. La muestra estuvo configurada por 1.397 sujetos (N = 1.397) de 6 provincias españolas. Los resultados muestran diferencias relevantes en función de las diferentes dimensiones de conocimiento exploradas. Con carácter general, es necesario señalar que en algunos conceptos relevantes para el conocimiento y la propia salud, se han obtenido resultados muy bajos que indican la necesidad de reforzar las estrategias encaminadas a elevar la ¿cultura física¿ de esta población
Risk factors for mortality in patients with acute leukemia and bloodstream infections in the era of multiresistance
Objectives: We assess the epidemiology and risk factors for mortality of bloodstream infection (BSI) in patients with acute leukemia (AL). Methods:
Prospectively collected data of a cohort study from July 2004 to February 2016. Multivariate analyses were performed. Results: 589 episodes of BSI were documented in 357 AL patients, 55% caused by gram-positive bacteria (coagulase-negative staphylococci 35.7%, Enterococcus spp 10.8%) and 43.5% by gram-negative bacteria (E. coli 21%, PA 12%). We identified 110 (18.7%) multidrug-resistant (MDR) microorganisms, especially MDR-Pseudomonas aeruginosa (7%) and extended-spectrum beta-lactamase producing Enterobacteriaceae (7%). The 30-day mortality was 14.8%. Age (OR 3.1; 95% CI 1.7–5.7); chronic lung disease (4.8; 1.1–21.8); fatal prognosis according to McCabe index (13.9; 6.4–30.3); shock (3.8; 1.9–7.7); pulmonary infection (3.6; 1.3–9.9); and MDR-PA infections with inappropriate treatment (12.8; 4.1–40.5) were related to mortality. MDR-PA BSI was associated to prior antipseudomonal cephalosporin use (9.31; 4.38–19.79); current use of betalactams (2.01; 1.01–4.3); shock (2.63; 1.03–6.7) and pulmonary source of infection (9.6; 3.4–27.21). Conclusions: MDR organisms were commonly isolated in BSI in AL. Inappropriate empiric antibiotic treatment for MDR-PA is the primary factor related to mortality that can be changed. New treatment strategies to improve the coverage of MDR-PA BSI should be considered in those patients with risk factors for this infection
Monte Carlo characterization of PETALO, a full-body liquid xenon-based PET detector
[EN] New detector approaches in Positron Emission Tomography imaging will play an important role in reducing costs, lowering administered radiation doses, and improving overall performance. PETALO employs liquid xenon as the active scintillating medium and UV-sensitive silicon photomultipliers for scintillation readout. The scintillation time in liquid xenon is fast enough to register time-of-flight information for each detected coincidence, and sufficient scintillation is produced with low enough fluctuations to obtain good energy resolution. The present simulation study examines a full-body-sized PETALO detector and evaluates its potential performance in PET image reconstruction.This work was supported by the European Research Council under grant ID 757829 and by Ministerio de Economia y Competitividad for grant FPA2016-78595-C3-1-R.Renner, J.; Romo-Luque, C.; Aliaga, RJ.; Álvarez-Puerta, V.; Ballester Merelo, FJ.; Benlloch-Rodríguez, J.; Carrión, J.... (2022). Monte Carlo characterization of PETALO, a full-body liquid xenon-based PET detector. Journal of Instrumentation. 17(5):1-14. https://doi.org/10.1088/1748-0221/17/05/P0504411417
Modelos de crecimiento y producción en España: historia, ejemplos contemporáneos y perspectivas
En el presente trabajo se presenta una revisión sobre los modelos forestales desarrollados en España durante los últimos años, tanto para la producción maderable como no maderable y, para la dinámica de los bosques (regeneración, mortalidad). Se presentan modelos tanto de rodal completo como de clases diamétricas y de árbol individual. Los modelos desarrollados hasta la fecha se han desarrollado a partir de datos procedentes de parcelas permanentes, ensayos y el Inventario Forestal Nacional. En el trabajo se muestran los diferentes submodelos desarrollados hasta la fecha, así como las plataformas informáticas que permiten utilizar dichos modelos. Se incluyen las principales perspectivas
de desarrollo de la modelización forestal en España.In this paper we present a review of forest models developed in Spain in recent years for both timber and non timber production and forest dynamics (regeneration, mortality). Models developed are whole stand, size (diameter) class and individual-tree. The models developed to date have been developed using data from permanent plots, experimental
sites and the National Forest Inventory. In this paper we show the different sub-models developed so far and the friendly use software. Main perspectives of forest modeling in Spain are presented.The models described in this paper were funded by
different regional, national and European projects, and
some of them were elaborated by the authors. This
work was funded by the Spanish Government by the
SELVIRED network (code AGL2008-03740) and the
strategic project «Restauración y Gestión Forestal»
(code PSE-310000-2009-4)
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