22 research outputs found
Análisis del rendimiento académico en los estudios de informática de la Universidad Politécnica de Valencia aplicando técnicas de minería de datos
En este trabajo presentamos un análisis del rendimiento académico de los alumnos de nuevo ingreso en la titulación de Ingeniería Técnica en Informática de Sistemas de la Universidad Politécnica de Valencia (UPV) a lo largo de tres cursos, aunque también se ha trabajado con las titulaciones de Ingeniería Técnica en Informática de Gestión y de Ingeniería Informática. Este análisis relaciona el rendimiento con las características socioeconómicas y académicas de los alumnos, que se obtienen en el momento de su matrícula, y que se recogen en la base de datos de la universidad. Hemos definido un indicador del rendimiento para cada alumno, teniendo en cuenta las calificaciones obtenidas y las convocatorias utilizadas. Para el estudio utilizamos técnicas de minería de datos, que pretenden determinar qué nivel de condicionamiento existe entre dicho rendimiento y características como el nivel de conocimientos de entrada del alumno, su contexto geográfico y sociocultural, etc… Esto proporciona una herramienta importante para la acción tutorial, que puede apoyarse en las predicciones de los modelos que se obtienen para encauzar sus recomendaciones y encuadrar las expectativas y el esfuerzo necesario para cada alumno, lógicamente dentro de la cautela habitual a la hora de tratar modelos inferidos a partir de datos.Universidad Politécnica de Valencia, a través del programa PACE
Role of age and comorbidities in mortality of patients with infective endocarditis
Purpose: The aim of this study was to analyse the characteristics of patients with IE in three groups of age and to assess the ability of age and the Charlson Comorbidity Index (CCI) to predict mortality.
Methods: Prospective cohort study of all patients with IE included in the GAMES Spanish database between 2008 and 2015. Patients were stratified into three age groups:<65 years, 65 to 80 years, and = 80 years.The area under the receiver-operating characteristic (AUROC) curve was calculated to quantify the diagnostic accuracy of the CCI to predict mortality risk.
Results: A total of 3120 patients with IE (1327 < 65 years;1291 65-80 years;502 = 80 years) were enrolled.Fever and heart failure were the most common presentations of IE, with no differences among age groups.Patients =80 years who underwent surgery were significantly lower compared with other age groups (14.3%, 65 years; 20.5%, 65-79 years; 31.3%, =80 years). In-hospital mortality was lower in the <65-year group (20.3%, <65 years;30.1%, 65-79 years;34.7%, =80 years;p < 0.001) as well as 1-year mortality (3.2%, <65 years; 5.5%, 65-80 years;7.6%, =80 years; p = 0.003).Independent predictors of mortality were age = 80 years (hazard ratio [HR]:2.78;95% confidence interval [CI]:2.32–3.34), CCI = 3 (HR:1.62; 95% CI:1.39–1.88), and non-performed surgery (HR:1.64;95% CI:11.16–1.58).When the three age groups were compared, the AUROC curve for CCI was significantly larger for patients aged <65 years(p < 0.001) for both in-hospital and 1-year mortality.
Conclusion: There were no differences in the clinical presentation of IE between the groups. Age = 80 years, high comorbidity (measured by CCI), and non-performance of surgery were independent predictors of mortality in patients with IE.CCI could help to identify those patients with IE and surgical indication who present a lower risk of in-hospital and 1-year mortality after surgery, especially in the <65-year group
Transverse momentum spectra of charged particles in proton-proton collisions at GeV with ALICE at the LHC
The inclusive charged particle transverse momentum distribution is measured
in proton-proton collisions at GeV at the LHC using the ALICE
detector. The measurement is performed in the central pseudorapidity region
over the transverse momentum range GeV/.
The correlation between transverse momentum and particle multiplicity is also
studied. Results are presented for inelastic (INEL) and non-single-diffractive
(NSD) events. The average transverse momentum for is (stat.) (syst.) GeV/ and
\left_{\rm NSD}=0.489\pm0.001 (stat.) (syst.)
GeV/, respectively. The data exhibit a slightly larger than measurements in wider pseudorapidity intervals. The results are
compared to simulations with the Monte Carlo event generators PYTHIA and
PHOJET.Comment: 20 pages, 8 figures, 2 tables, published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/390
Neutral pion and meson production in proton-proton collisions at TeV and TeV
The first measurements of the invariant differential cross sections of
inclusive and meson production at mid-rapidity in proton-proton
collisions at TeV and TeV are reported. The
measurement covers the ranges GeV/ and GeV/ for
these two energies, respectively. The production of mesons was measured
at TeV in the range GeV/. Next-to-Leading Order
perturbative QCD calculations, which are consistent with the spectrum
at TeV, overestimate those of and mesons at
TeV, but agree with the measured ratio at
TeV.Comment: 17 pages, 5 captioned figures, 2 tables, authors from page 12,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/310
Learning MDL-guided Decision Trees for Constructor-Based Languages
In this paper, we present a method for generating very expressive decision trees based on several partitions over a functional logic language. First, trees are generated top-down and partitions are selected according to the MDL principle. Secondly, not only a decision tree is obtained, but multiple decision trees can be produced guided as well by the MDL principle. This means that the overall search space is scoured in a short-to-long fashion, so allowing a better use of computational resources. The mos