Direct marketing modeling. A case study with Dell

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Desarrollo e implementación de un sistema de bicicletero seguro basado en tecnología LoRa para el campus Miguelete de la Universidad Nacional de General San Martín.

Proyecto Final IntegradorEl objetivo principal de este proyecto es el estudio y diseño de un sistema de bicicleteros seguros a implementarse en la Universidad Nacional de General San Martín, particularmente, en el campus Miguelete. Se pretende dar soluciones al personal docente y no docente y estudiantes, facilitando su transporte y seguridad a la hora de dejar las bicicletas en el predio. El sistema consta de un dispositivo llamado candado electrónico ubicado en el bicicletero, y otro dispositivo transceptor ubicado dentro de la Escuela de Ciencia y Tecnología de la Universidad Nacional de General San Martín. Además, como parte del proyecto, se incluye una aplicación móvil que permite a la comunidad educativa hacer uso de los candados, mediante la generación de una clave única que permite bloquear y desbloquear los mismos. Para lograr la implementación, se estudió acerca de tecnologías de las telecomunicaciones que pudieran servir para la implementación de dichos bicicleteros seguros. Finalmente se tomó la decisión de utilizar la tecnología de Largo Alcance LoRa para la comunicación entre el candado y el transceptor, para lograr por ejemplo la apertura y cierre del pestillo de seguridad, mediante la transmisión y recepción de la clave única. Por otro lado, el sistema está sustentado en la utilización de una base de datos que almacena la información de los usuarios y los candados electrónicos. El dispositivo transceptor debe comunicarse con la base de datos para consultar acerca del estado del candado. Para ello, se establece una comunicación a través del estándar 802.11n. Se seleccionó este proyecto debido a su estrecha relación con la Ingeniería en Telecomunicaciones, donde se involucra el estudio e implementación de una comunicación LoRa y una comunicación bajo el estándar 802.11n. Además, es un proyecto que aporta a la idea de un campus inteligente, sustentable y donde toda la comunidad académica se sienta segura de transitar.Fil: Acher Moranchel, Moira Rocio. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Buenos Aires, Argentina.Fil: Ibero, Lucio Javier. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Buenos Aires, Argentina

Using high-resolution voltage maps to predict “redo” in the treatment of atrial fibrillation (AF)

The aim of this work is to use biomarkers extracted from high-resolution voltage maps of atrial fibrillation (AF) patients in order to make predictions about future “redo” procedures. We collected maps of the left atrium of 122 patients, prior of being treated for AF The bipolar voltage maps were extracted with the Rythmia system from Boston Scientific and subsequently analyzed in the MATLAB environment. The present study focuses on three biomarkers extracted from those maps. Two are associated with the bipolar voltage measurements on the map, i.e., the mean voltage and the voltage dispersion on the map. The third indicator is the area of the atrium evaluated from the map. The data are used for feeding a supervised classification algorithm. The output variable is a binary variable that is set to 1 if the patient will need a “redo” procedure in the twelve months following the cardiac intervention and 0 otherwise. We show that the biomarkers have some statistical power in predicting future outcomes. Especially the mean voltage on the map is the best predictor of the future outcome. We determine the cutoff value for the mean voltage based on the best prediction accuracy of Vm=0.542 mV in agreement with previous studies. We discuss some extensions of this study that could allow improvements in predictive power.Peer ReviewedPostprint (published version

VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies: III. the atlas of the stellar and ionized gas distribution

Context. Luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) are much more numerous at higher redshifts than locally, dominating the star-formation rate density at redshifts ∼1-2. Therefore, they are important objects in order to understand how galaxies form and evolve through cosmic time. Local samples provide a unique opportunity to study these objects in detail. Aims. We aim to characterize the morphologies of the stellar continuum and the ionized gas (Hα) emissions from local sources, and investigate how they relate with the dynamical status and IR-luminosity of the sources. Methods. We use optical (5250-7450 Å) integral field spectroscopic (IFS) data for a representative sample of 38 sources (31 LIRGs and 7 ULIRGs), taken with the VIMOS instrument on the VLT. Results. We present an atlas of IFS images of continuum emission, Hα emission, and Hα equivalent widths for the sample. The morphologies of the Hα emission are substantially different from those of the stellar continuum. The Hα images frequently reveal extended structures that are not visible in the continuum, such as HII regions in spiral arms, tidal tails, rings, bridges, of up to few kpc from the nuclear regions. The morphologies of the continuum and Hα images are studied on the basis of the C2 kpc parameter, which measures the concentration of the emission within the central 2 kpc. The C2 kpc values found for the Hα images are higher than those of the continuum for the majority (85%) of the objects in our sample. On the other hand, most of the objects in our sample (∼62%) have more than half of their Hα emission outside the central 2 kpc. No clear trends are found between the values of C2 kpc and the IR-luminosity of the sources. On the other hand, our results suggest that the star formation in advance mergers and early-stage interactions is more concentrated than in isolated objects. Finally, we compared the Hα and infrared emissions as tracers of the star-formation activity. We find that the star-formation rates derived using the Hα luminosities generally underpredict those derived using the IR luminosities, even after accounting for reddening effects. © 2011 ESO.Based on observations carried out at the European Southern observatory, Paranal (Chile), Programs 076.B- 0479(A), 078.B-0072(A) and 081.B-0108(A).The Digitized Sky Surveys were produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166.This work has been supported by the Spanish Ministry of Science and Innovation (MICINN) under grant ESP2007-65475-C02-01. AM-I is supported by the Spanish Ministry of Science and Innovation (MICINN) under program “Specialization in International Organisms”, Ref. ES2006-0003.Peer Reviewe

A comparison of methodologies for pulmonary veins segmentation in high definition voltage maps of patients with atrial fibrillation

This paper compares three methodologies used to seg- ment images extracted from the atria of patients with atrial fibrillation (AF). We collected voltage maps of 120 pa- tients’ left atrium before being treated for AF with tissue ablation. The high-definition voltage maps (HDVM) were extracted with the Rythmia software system from Boston Scientific and subsequently analyzed offline in MATLAB. During the analysis, the atrium is segmented into three main structures: body, pulmonary veins (PVs), and mitral valve (MV). Method I is based on a manual elimination of the PV by the operator. Method II uses a semi-automatic method based on geometric considerations coupled with a thresh- old for voltage value. Method III, in addition, uses geo- metric features, i.e., the geometric curvature, to eliminate the maps’ PVs. We quantitatively compare the two first methods’ effi- ciency and ease of use. In particular, the values of two electrical biomarkers associated with the maps are com- puted before and after the PV’s elimination process. This allows us to classify them according to their sensitivity with respect to the cleaning of the PVs. Finally, we discuss which methodology is more adequate to perform the PVs and MV segmentation in light of im- proving the precision of the resulting maps.Postprint (published version

¿Qué tengo que saber para medir bien el ventrículo derecho por ecocardiograma?

Right ventricle echocardiographic evaluation is technically complex, affecting sometimes its quality in standard studies. This review article focuses on how to properly measure and interpretate the most commonly use echocardiographic parameters, taking into account its particularities, indications and limitations in our daily clinical practice.La dificultad técnica de la valoración del ventrículo derecho por medio de la imagen y, especialmente por ecocardiografía, hace que su evaluación quede relegada a un segundo plano en numerosas ocasiones. Este artículo de revisión se centra de forma específica en las particularidades del estudio del ventrículo derecho por ecocardiografía, sus indicaciones y limitaciones, así como el modo de interpretación de los principales parámetros empleados en la práctica clínica diaria

Integral field spectroscopy based Hα sizes of local luminous and ultraluminous infrared galaxies. A direct comparison with high-z massive star-forming galaxies

[Aims]: We study the analogy between local luminous and ultraluminous infrared galaxies (U/LIRGs) and high-z massive star forming galaxies (SFGs) by comparing their basic Hα structural characteristics, such as size and luminosity surface density, in an homogeneous way (i.e. same tracer, size definition, and similar physical scales). [Methods]: We use integral field spectroscopy (IFS) based Hα emission maps for a representative sample of 54 local U/LIRGs (66 galaxies) observed with INTEGRAL/WHT and VIMOS/VLT. From this initial sample, we select 26 objects with similar Hα luminosities (L(Hα)) to those of massive (i.e. M * ∼ 10 10 M ⊙ or larger) SFGs at z ∼ 2, and observed on similar physical scales. We then directly compare the sizes, and luminosity (and SFR) surface densities of these local and high-z samples. [Results]: The size of the Hα emitting region in the local U/LIRGs that we study has a wide range of values, with r 1/2(Hα) from 0.2 kpc to 7 kpc. However, about two-thirds of local U/LIRGs with L ir > 10 11.4 L ⊙ have compact Hα emission (i.e. r 1/2 2 kpc). These are systems that show evidence of pre-coalescence merger activity and are indistinguishable from the massive high-z SFGs galaxies in terms of their Hα sizes, and luminosity and SFR surface densities. © 2012 ESO.MGM is supported by the German federal department for education and research (BMBF) under the project number 50OS1101. This work has been supported by the Spanish Ministry of Science and Innovation (MICINN) under grants ESP2007-65475- C02-01 and AYA2010-21161-C02-01.Peer Reviewe

Masa septal interauricular: más allá de la hipertrofia lipomatosa

We report a case of a patient with past history of multiple mieloma with a great amount of extramedullar disease. The patient had an interatrial mass as an incidental finding. After completion of study with cardiovascular magnetic resonance there was evidence of malignant characteristics. Thus the interatrial mass was probably a cardiac extramedullary plasmacytoma.Se presenta el caso de un paciente con antecedente de mieloma múltiple con abundante enfermedad extramedular, en el que se produce un hallazgo incidental de una masa interauricular. Tras un estudio mediante resonancia cardíaca se descarta su comportamiento benigno y, dentro del contexto clínico del paciente, se diagnostica de plasmocitoma cardíaco extramedular

Diagnóstico por imagen de la disección arterial coronaria espontánea

Spontaneous coronary artery dissection (SCAD) is an infrequent cause of acute coronary syndrome (ACS), which requires a specific diagnostic workup and therapeutic management. Coronary angiography is the preferred technique for the diagnosis of SCAD. However, its inability to characterize the artery wall emphasizes the need of other imaging techniques, such as intracoronary imaging or coronary CT angiography. We present a case report of a young postpartum woman with preeclampsia who developed an ACS due to a spontaneous coronary artery dissection. In this case we demonstrate the clinical value of different imaging techniques.La disección coronaria espontánea (DCE) es una causa infrecuente de síndrome coronario agudo (SCA) que precisa una aproximación diagnóstica y terapéutica específica. La coronariografía invasiva es la técnica de elección para el diagnóstico de la DCE. Sin embargo, la incapacidad para caracterizar la pared arterial hace necesario, en algunos casos, utilizar otras técnicas diagnósticas, como la imagen intracoronaria o la coronariografía por TC. Se presenta el caso de una mujer joven, puérpera, con diagnóstico de preeclampsia, que desarrolla un SCA secundario a una DCE donde se demuestra la utilidad de las distintas técnicas diagnósticas

Post-mortem findings in Spanish patients with COVID-19; a special focus on superinfections

IntroductionWhole-body autopsies may be crucial to understand coronavirus disease 2019 (COVID-19) pathophysiology. We aimed to analyze pathological findings in a large series of full-body autopsies, with a special focus on superinfections. MethodsThis was a prospective multicenter study that included 70 COVID-19 autopsies performed between April 2020 and February 2021. Epidemiological, clinical and pathological information was collected using a standardized case report form. ResultsMedian (IQR) age was 70 (range 63.75-74.25) years and 76% of cases were males. Most patients (90%,) had at least one comorbidity prior to COVID-19 diagnosis, with vascular risk factors being the most frequent. Infectious complications were developed by 65.71% of the patients during their follow-up. Mechanical ventilation was required in most patients (75.71%) and was mainly invasive. In multivariate analyses, length of hospital stay and invasive mechanical ventilation were significantly associated with infections (p = 0.036 and p = 0.013, respectively). Necropsy findings revealed diffuse alveolar damage in the lungs, left ventricular hypertrophy in the heart, liver steatosis and pre-infection arteriosclerosis in the heart and kidneys. ConclusionOur study confirms the main necropsy histopathological findings attributed to COVID-19 in a large patient series, while underlining the importance of both comorbid conditions and superinfections in the pathology