Fractura de la apófisis coracoides asociada con luxación de la articulación acromio clavicular

Las fracturas de la apófisis coracoides asociada con luxación de la articulación acromioclavicular y con rotura de los ligamentos coracoclaviculares en los adultos ocurren infrecuentemente. Este artículo añade otro caso más a la literatura, para enfatizar la importancia del reconocimiento de este tipo de lesiones. El diagnóstico se realiza mediante una radiografía anteroposterior y una lateral axial y/o la TAC. El tratamiento puede ser quirúrgico u ortopédico con mínimas alteraciones residuales.A coracoid process fracture associated with acromioclavicular joint dislocation is an unusual lesion in adults. This report adds another case to the literature to reemphasize the importance of recognizing this unusual lesion. An anteroposterior and axillary lateral radiograph or CT-scan often is needed for diagnosis of the fracture. Surgical and nonsurgical treatment appear to ofter equally favorable results

A Quantitative method for the characterization of lytic metastases of the bone from radiographic images

The aim of our study was to assess the diagnostic usefulness of the gray level parameters to distinguish osteolytic lesions using radiological images. Materials and Methods: A retrospective study was carried out. A total of 76 skeletal radiographs of osteolytic metastases and 67 radiographs of multiple myeloma were used. The cases were classified into nonflat (MM1 and OL1) and flat bones (MM2 and OL2). These radiological images were analyzed by using a computerized method. The parameters calculated were mean, standard deviation, and coefficient of variation (MGL, SDGL, and CVGL) based on gray level histogram analysis of a region-of-interest.Diagnostic utility was quantified bymeasurement of parameters on osteolyticmetastases andmultiplemyeloma, yielding quantification of area under the receiver operating characteristic (ROC) curve (AUC). Results: Flat bone groups (MM2 and OL2) showed significant differences in mean values of MGL ( = 0.048) and SDGL ( = 0.003). Their corresponding values of AUC were 0.758 for MGL and 0.883 for SDGL in flat bones. In nonflat bones these gray level parameters do not show diagnostic ability. Conclusion: The gray level parametersMGL and SDGL show a good discriminatory diagnostic ability to distinguish between multiple myeloma and lytic metastases in flat bones

Objective evaluation of static and dynamic behavior of different toric silicone-hydrogel contact lenses

The present study aimed to estimate how orientation position, recovery time, and contact lens decentration, associated with visual performance, may vary on several designs of the most recent toric silicone-hydrogel toric contact lenses in two-time different momentsS

Facilitating the learning process in parallel computing by using instant messaging

[EN] Parallel Programming skills may require a long time to acquire. “Think in parallel” is a skill that requires time, efort, and experience. In this work, we propose to facilitate the students’ learning process in parallel programming by using instant messaging. Our aim was to fnd out whether students’ interaction through instant messaging tools is benefcial for the learning process. In order to do so, we asked several students of an HPC course of the Master’s degree in Computer Science of the University of León to develop a specifc parallel application, each of them using a diferent application program interface: OpenMP, MPI, CUDA, or OpenCL. Even though the used APIs are diferent, there are common points in the design process. We encouraged students to interact with each other by using Gitter, an instant messaging tool for GitHub users. Our analysis of the communications and results demonstrate that the direct interaction of students through the Gitter tool has a positive impact on the learning process.SIMinisterio de Ciencia, Innovación y UniversidadesEuropean Commission Erasmus+ (2018-1-ES01-KA201-050939

Estimación del ritmo cardíaco mediante análisis de secuencias de vídeo

La estimación y el seguimiento de la frecuencia cardíaca han sido esenciales en los campos de la medicina y la ingeniería biomédica a lo largo de los años. En la actualidad, existe un gran interés por extraerla sin contacto, por lo que la estimación de la frecuencia cardíaca mediante el uso de la cámara digital es un área de investigación en rápido crecimiento debido a su bajo costo y su naturaleza no invasiva. El objetivo de este trabajo es diseñar y desarrollar un algoritmo que nos permita detectar el ritmo cardíaco de un individuo mediante el análisis de secuencias de vídeo de su cara. Se ha diseñado e implementado una nueva aproximación, basada en un algoritmo base fundamentado en el trabajo previo en el que nos apoyamos. En primer lugar se realiza la detección facial mediante el algoritmo de Viola-Jones para localizar el área de la imagen que contiene la cara. A continuación, se extrae el movimiento de la cabeza usando el método de Lucas-Kanade y se aísla el movimiento correspondiente al pulso mediante un filtrado. Posteriormente se realiza el análisis de componentes principales (PCA) para seleccionar la componente que mejor se corresponda con los latidos del corazón en función de su espectro de frecuencia temporal. Finalmente, se analiza el movimiento proyectado en esta componente y se estima el ritmo cardíaco como la frecuencia (en bpm) con mayor potencia. Los experimentos muestran que, si los vídeos están grabados bajo unas buenas condiciones, podemos detectar el ritmo cardiaco de una persona obteniendo unas muy bajas tasas de error.The estimation and monitoring of heart rate have been essential in the fields of medicine and biomedical engineering over the years. At present, there is a great interest to extract it without contact, so the estimation of the heart rate by using the digital camera is a research area in rapid growth due to its low cost and non-invasive nature. The objective of this work is to design and develop an algorithm that allows us to detect the heart rhythm of an individual by analyzing video sequences of his face. A new approach has been designed and implemented, starting from a base algorithm based on previous work in which we rely. First, facial detection is performed using the Viola-Jones algorithm to locate the area of the image that contains the face. Then the motion of the head is extracted using the Lucas-Kanade method and the motion corresponding to the pulse is isolated by filtering. Afterwards, the main components analysis (PCA) is performed to select the component that best corresponds to the heartbeat according to its temporal frequency spectrum. Finally, the motion projected to this component is analyzed and the heart rate is estimated as the frequency (in bpm) with greater power. The experiments show that, if the videos are recorded under good conditions, we can detect the heart rate of a person getting low error ratesUniversidad de Sevilla. Grado en Ingeniería de las Tecnologías de Telecomunicació

Hydrogen storage system for eVTOL vehicles. Automation and Sstandardisation of the refuelling pocess

[ES] El crecimiento de las ciudades junto con la contaminación y la necesidad de reducirla, hace que surjan posibles futuras exigencias en cuanto al transporte sostenible. De ello surge el ZATA, un VTOL eléctrico de pila de hidrógeno diseñado por Capgemini. Debido a los problemas que tiene aún esta tecnología surge la necesidad de un sistema de almacenamiento de hidrógeno que sea viable para este tipo de vehículos y se procede a diseñarlo junto con una automatización de la recarga del mismo y una comparativa con otras posibilidades para ello. La alternativa que se desarrolla en este trabajo es el cambio de las bombonas vacías al final de una misión por bombonas llenas, y la comparativa se hace con un sistema similar al de las hidrogeneras de los coches de pila de hidrógeno. Partiendo de la base del diseño del ZATA, su estructura, parte propulsiva y datos calculados de consumo de electricidad y de un modelado de la pila de hidrógeno, se diseña el sistema de almacenamiento del hidrógeno de forma que se equilibren peso, tamaño y simplicidad. Se calcula el volumen de hidrógeno a 700 bar necesario y la forma de conectarlo con la célula, buscando en diferentes catálogos de fabricantes los elementos básicos del sistema, como son las bombonas, las válvulas, las mangueras y roscas de conexión. Se diseña en CAD las bombonas y el sistema de enganche para las roscas para automatizarlo, decidiendo que el método sea un tornillo sin fin- corona, de forma que el proceso sea rápido y no sea necesaria la interacción humana. Con la parte interior diseñada, se procede al diseño de la automatización del sistema exterior, el cual se decide que sea similar a los de cambios de baterías automatizados en coches eléctricos, llegando así la aeronave de diseño a una estación de recambio, y mediante un brazo robótico que se mueva sobre un raíl, la aeronave se abra, agarre los tanques y en ese momento entra en funcionamiento el sistema interior, de forma que las bombonas quedan libres, el brazo las deposita en un almacén, recoge unas llenas y las lleva a la aeronave, donde el sistema exterior las vuelve a enganchar en el eVTOL, quedando éste listo para una nueva misión.[EN] The growth of cities together with pollution and the need to reduce it, raises possible future requirements in terms of sustainable transport. From this arises the ZATA, a hydrogen cell electric VTOL designed by Capgemini. Due to the problems that this technology still has, the need arises for a hydrogen storage system that is viable for this type of vehicle and we proceed to design it together with an automated refuelling system and a comparison with other possibilities for this purpose. The alternative developed in this work is the exchange of empty tanks at the end of a mission for full tanks, and the comparison is made with a system similar to the hydrogen stations for fuel cell cars. Based on the design of the ZATA, its structure, propulsion part and calculated electricity consumption data and modelling of the hydrogen fuel cell, the hydrogen storage system is designed to balance weight, size and simplicity. The volume of hydrogen at 700 bar required and the way to connect it to the cell is calculated, searching in different manufacturers' catalogues for the basic elements of the system, such as cylinders, valves, hoses and connection threads. The cylinders and the coupling system for the threads are designed in CAD to automate it, deciding that the method should be a worm screw-crown, so that the process is quick and human interaction is not necessary. With the interior part designed, we proceed to the design of the automation of the exterior system, which is decided to be similar to those of automated battery changes in electric cars, so that the aircraft design arrives at a refuelling station, and a robotic arm moves on a rail, the aircraft opens, grabs the tanks and at that moment the interior system comes into operation, so that the cylinders are free, the arm deposits them in a warehouse, picks up the full ones and takes them to the aircraft, where the exterior system reattaches them to the eVTOL, leaving it ready for a new mission

Simplified Hand Configuration for Object Manipulation

This work is focused on obtaining realistic human hand models that are suitable for manipulation tasks. Firstly, a 24 DOF kinematic model of the human hand is defined. This model is based on the human skeleton. Intra-finger and inter-finger constraints have been included in order to improve the movement realism. Secondly, two simplified hand descriptions (9 and 6 DOF) have been developed according to the constraints predefined. These simplified models involve some errors in reconstructing the hand posture. These errors are calculated with respect to the 24 DOF model and evaluated according to the hand gestures. Finally, some criteria are defined by which to select the hand description best suited to the features of the manipulation task

Watermills: The Origin of the Use of Renewable Hydraulic Energy in Spain

The use of renewable hydraulic energy sources by mankind most likely has its origins in the development of the watermills. To understand the functioning of these mills, this article first reviews, through the analysis of different bibliographical sources, the technical evolution of the machinery used since the appearance of the first watermills to grind cereal grain in the 1st century BC. Secondly, a particular area of the south-west of Spain, Alcalá de Guadaíra, has been selected for study, whose strategic location as well as its hydrological characteristics gave rise, firstly, to an intensive milling industry, and, later, a famed baking industry, from the late Middle Ages until recent decades. The huge development of these two industrial activities has made Alcalá de Guadaíra an exceptional example in Spain, with 40 watermills in the early 18th century. Extensive work on site allowed the analysis of the state and types of watermills that still exist in this area, identifying their similarities and differences. Unfortunately, after they fell into disuse, only 28 of these mills remain today; 12 of them are in a relative good state of preservation, seven in an alarming state of ruin and, of the other nine, only some unrecognisable vestiges remain. Some of these mill buildings have been restored recently, although their machinery is missing. Only from old photographs or by visiting mills restored in other areas is it possible to determine how these watermills worked. Due to the lack of financial resources to carry out physical restoration of the industrial heritage missing in these flour mills, a virtual model of one of them has been developed. This work provides, at least virtually, a reconstruction of the traditional mills which helps promote technological studies and shows how they worked, as part of virtual exhibitions. In addition, a computer application of augmented reality has been developed that any visitor can install on a mobile device to display the virtual reality of the machinery, generated by 3D models, so they can visualise the physical reality that they would have found in the mill

Estudio sobre los niveles de actividad física y su relación con las situaciones de acoso escolar en la Educación Primaria

Este trabajo se centra en conocer la relación entre los niveles de actividad física y las situaciones de acoso escolar en alumnos de 6º curso de Educación Primaria. La muestra estuvo compuesta por un total de 37 alumnos, de los cuales 17 fueron niños y 20 niñas. Todos tenían unas edades comprendidas entre los 11 y 12 años. Estos alumnos realizaron dos tipos de cuestionarios: el Cuestionario de Actividad Física (Physical Activity Questionnair / PAQ) y el Cuestionario de Acoso entre Iguales (CAI). Los resultados obtenidos presentaron unos niveles medios de actividad física y unos niveles bajos de percepción de acoso escolar entre iguales. Lo más significativo ha sido que los chicos presentan valores más altos en cuanto a la percepción de acoso escolar y un mayor inconformismo de género que las chicas. Siendo el acoso físico el tipo de acoso más común entre los niños y el acoso verbal entre las niñas. A pesar de encontrar correlaciones significativas entre los niveles de actividad física y las situaciones de acoso escolar en 6º curso de Educación Primaria, estas son bajas y poco concluyentes a la hora de explicar la problemática estudiada.The aim of the present work is knowing the link between levels of physical activity and situations of harassment in sixth grade students. The sample consisted of 37 students, 17 of them were boys and 20 were girls. Students had ranged in age from 11 to 12 years old. Those pupils answered two types of surveys, the Physical Activity Questionnaire (PAQ) and the Peer Harassment Questionnaire (the Spanish CAI). The results showed medium levels of physical activity and low levels of bullying perception among peers. The most significant aspect has been that boys showed higher levels of bullying perception and of gender nonconformity than girls, being the physical harassment the most common bullying among boys, and the verbal one the most used among girls. Despite observing important correlations between physical activity levels and bullying situations in sixth grade, these are low and inconclusive for explaining the problem shown.Universidad de Sevilla. Grado en Educación Primari

Estudio del impacto lumínico de la rehabilitación de huecos de fachada en función del tipo de tejido urbano en la herramienta UMI (Urban Modelling Interface)

El presente Trabajo Fin de Grado (TFG) se centra en el estudio a nivel urbano del impacto de medidas de rehabilitación aplicadas en huecos de fachada de edificios de tipología de bloqueen H y bloque lineal en la ciudad de Sevilla, con el objetivo de evaluar el impacto de variables como los porcentajes de hueco-fachada y la orientación para alcanzar un correcto aprovechamiento de luz natural. Para ello, se ha utilizado el indicador Continuous Daylight Autonomy (cDA), métrica dinámica de iluminación natural. Además, este trabajo evalúa el impacto energético que supondría el uso de reguladores de luz en edificios de estas características. Otro interés que genera este trabajo es el uso de herramientas novedosas como UMI (Urban Modelling Interface) del prestigioso MIT (Massachusetts Institute of Technology).Universidad de Sevilla. Grado en Fundamentos de la Arquitectur