Recursos de colección

Archivo Digital UPM (121.743 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Electrónica

Mostrando recursos 1 - 20 de 243

  1. Sistemas de alarma anti-intrusión

    Bustos García, Arturo; Lee, Kil Ho Kim; Muñoz Fernández, Sergio
    La presente investigación presenta los conceptos básicos, tanto teóricos como prácticos, para la elaboración de un sistema de alarma anti-intrusión, buscando los componentes que optimicen el proceso y minimicen los costes.

  2. Reduced basis approximations in microwave filters and diplexers: Inf-sup constant behavior

    García Salgado, Sara; Rubia Hernández, Valentin de la; Mrozowski, Michal
    In this work, a model order reduction technique for fast frequency sweep in microwave filters and diplexers via the Reduced Basis Method is detailed. The Finite Element Method is used to solve the time-harmonic Maxwell's equations in these resonant circuit problems. Taking into account the electromagnetic field varies smoothly as a function of the frequency parameter, a low dimension system parameter manifold is identified. Thus, the original frequency-dependent Finite Element problem can be approximated by a model of reduced size using a Reduced Basis approximation. Based on the field frequency behavior in these resonant structures, the Reduced Basis space where...

  3. Loewner matrix approach for circuit modelling in FEM analysis of microwave filters

    Young, David; Rubia Hernández, Valentín de la
    A circuit description of the electromagnetic behavior in microwave filters by means of the data provided by FEM analysis in the frequency band of interest is detailed. Loewner matrix approach is used to carry out a tangential interpolation of the simulation data, giving rise to a linear dynamical system description fitting the simulation results. The FEM solver is then used as a black box unlike other model-order reduction techniques. As a result, from this linear dynamical system, a transversal coupling matrix gathering all electromagnetic phenomena within a frequency band is found.

  4. Análisis de la simulación y monitoreo real de un invernadero en la implicación térmica de un edificio : un caso práctico

    Felices Puertolas, Rubén; Viñas Arrebola, Carmen; Losada González, Juan Carlos
    The thermal performance of a sunspace attached to a bioclimatic building in Madrid has been studied. As a passive strategy, combines naturally the effect of the direct solar radiation and the absorption of the opaque constructive systems and the thermal properties of the air enclosed in the sunspace. During the winter, the sun warms the air enclosed allowing to use it as a natural collector of warm air to introduce it in the inner areas. During the summer, it’s a buffer space who prevent the infuence of the ambient conditions in the inner areas. In the case studied, most of...

  5. Context-aware prediction of access points demand in Wi-Fi networks

    Rodríguez-Lozano, David; Gómez-Pulido, Juan A.; Lanza-Gutiérrez, José M.; Durán-Domínguez, Arturo
    We present a methodology based on matrix factorization and gradient descent to predict the number of sessions established in the access points of a Wi-Fi network according to the users’ behavior. As the network considered in this work is monitored and controlled by software in order to manage users and resources in real time, we may consider it as a cyber-physical system that interacts with the physical world through access points, whose demands can be predicted according to users’ activity. These predictions are useful for relocating or reinforcing some access points according to the changing physical environment. In this work...

  6. Antigen-Antibody Affinity for Dry Eye Biomarkers by Label Free Biosensing. Comparison with the ELISA Technique

    Laguna Heras, Maria Fe; Holgado Bolaños, Miguel; López Hernández, Ana; Santamaría Fernández, Beatriz; Lavín Hueros, Álvaro; Soria, Javier; Suarez, Tatiana; Bardina, Carlota; Jara, Mónica; Sanza Gutiérrez, Francisco Javier; Casquel Del Campo, Rafael
    The specificity and affinity of antibody-antigen interactions is a fundamental way to achieve reliable biosensing responses. Different proteins involved with dry eye dysfunction: ANXA1, ANXA11, CST4, PRDX5, PLAA and S100A6; were validated as biomarkers. In this work several antibodies were tested for ANXA1, ANXA11 and PRDX5 to select the best candidates for each biomarker. The results were obtained by using Biophotonic Sensing Cells (BICELLs) as an efficient methodology for label-free biosensing and compared with the Enzyme-Linked Immuno Sorbent Assay (ELISA) technique.

  7. Contribuciones para el control metrológico de instrumentos acústicos en Colombia

    Olivella López, Juliette
    La necesidad de medir es evidente en la mayoría de las actividades profesionales de un ingeniero acústico. El sonómetro es una de sus herramientas indispensables, y de su debida caracterización metrológica dependerá la validez de los resultados de las medidas y su comparabilidad. La Calibración de estos sonómetros es un proceso estandarizado por normativa ISO [1], sin embargo más allá de los factores técnicos de la norma, implementar un laboratorio supone diversos retos ligados al contexto del país. En este Trabajo de Fin de Master se estudiaron cada uno de esos factores, se logró la implementación real de un laboratorio capaz de...

  8. Using Buildroot for building Embedded Linux Systems (BeagleBone Black)

    Ruiz González, Mariano; Jiménez Martínez, Francisco Javier
    This document describes the basic steps to develop and embedded Linux-based system using the BeagleBone Black (BBB). The document has been specifically written to use a BBB development system based on the AM335x Texas Instruments Sitara processor. All the software elements used to build the Linux distribution have a GPL license

  9. Subjective assessment of super multiview video with coding artifacts

    Recio Nogales, Rocío; Carballeira López, Pablo; Gutierrez Sanchez, Jesus; García Santos, Narciso
    The subjective assessment of super multiview (SMV) video considers two main perceptual factors: image quality and visual comfort at the viewpoint transition. While previous works only covered raw content with high levels of visual comfort, this work supersedes them by targeting the subjective assessment of SMV content with coding artifacts. The outcome of this analysis yields important conclusions regarding the relationship between these two factors, indicating that 1) the perceived image quality is independent from the view point change speed, and 2) the perceived visual comfort at the view point transition is independent from the image quality. These conclusions facilitate...

  10. Detection of anomalies in surveillance scenarios using mixture models

    Tomé Alonso, Adrián; Salgado Álvarez de Sotomayor, Luis
    In this paper we present a robust and simple method for the detection of anomalies in surveillance scenarios. We use a “bottom-up” approach that avoids any object tracking, making the system suitable for anomaly detection in crowds. A robust optical flow method is used for the extraction of accurate spatio-temporal motion information, which allows to get simple but discriminative descriptors that are employed to train a Gaussian mixture model. We evaluate our system in a publicly available dataset, concluding that our method outperforms similar anomaly detection approaches but with a simpler model and low-sized descriptors.

  11. MultiView perceptual disparity model for super multiView video

    Carballeira López, Pablo; Gutiérrez Sánchez, Jesús; Morán Burgos, Francisco; Cabrera Quesada, Julian; Jaureguizar Núñez, Fernando; García Santos, Narciso
    Super MultiView (SMV) video display is the most promising technology for 3-D glasses-free visualization. Although only a few prototypes are currently available, the research on tech- nical and perceptual factors related to this approach is crucial. This paper presents a novel model to capture the subjective per- ception of SMV, called the MultiView Perceptual Disparity Model (MVPDM), by means of a parametrization of the relation between: 1) capture and scene settings, and 2) perception of speed comfort and smoothness in the viewpoint transition. The MVPDM is based on a novel parameter: the perceptual disparity, that captures ap- propriately the perceptual...

  12. Application-layer FEC scheme configuration optimization via hybrid simulated annealing

    Díaz Martín, César; Cabrera Quesada, Julian; Jaureguizar Nuñez, Fernando; García Santos, Narciso
    An optimization technique based on an adapted combination of simulated annealing (SA) and tabu search (TS) is presented. This method aims at finding near-optimal unequal error protection (UEP) application-layer FEC code configurations. This approach is intended to smartly protect audio and video transmission over IP networks when hard time restrictions apply. The considered code is a UEP version of the widely-used Pro-MPEG COP3 codes enabling the use of several matrices of dissimilar size and thus of unequal recovery capability. Finding the optimal configuration frequently requires the evaluation of a large solution space. So, to fulfill the imposed constraints, SA is...

  13. Detecting exercise-induced fatigue using thermal imaging and deep learning

    Bordallo López, Miguel; Blanco Adán, Carlos Roberto del; García Santos, Narciso
    Fatigue has adverse effects in both physical and cognitive abilities. Hence, automatically detecting exercise-induced fatigue is of importance, especially in order to assist in the planning of effort and resting during exercise sessions. Thermal imaging and facial analysis provide a mean to detect changes in the human body unobtrusively and in variant conditions of pose and illumination. In this context, this paper proposes the automatic detection of exercise-induced fatigue using thermal cameras and facial images, analyzing them using deep convolutional neural networks. Our results indicate that classification of fatigued individuals is possible, obtaining an accuracy that reaches over 80% when...

  14. Detection of stationary foreground objects using multiple nonparametric background-foreground models on a finite state machine

    Cuevas Rodríguez, Carlos; Martínez Sanz, Raquel; Berjón Díez, Daniel; García Santos, Narciso
    There is a huge proliferation of surveillance systems that require strategies for detecting different kinds of stationary foreground objects (e.g., unattended packages or illegally parked vehicles). As these strategies must be able to detect foreground objects remaining static in crowd scenarios, regardless of how long they have not been moving, several algorithms for detecting different kinds of such foreground objects have been developed over the last decades. This paper presents an efficient and highquality strategy to detect stationary foreground objects, which is able to detect not only completely static objects but also partially static ones. Three parallel nonparametric detectors with...

  15. Symptoms analysis of 3D TV viewing based on simulator sickness questionnaires

    Brunnström, Kjell; Wang, Kun; Tavakoli, Samira; Andrén, Börje
    Stereoscopic 3D TV viewing puts different visual demands on the viewer compared to 2D TV viewing. Previous research has reported on viewers’ fatigue and discomfort and other negative effects. This study is to investigate further how severe and what symptoms may arise from somewhat longish 3D TV viewing. The MPEG 3DV project is working on the next-generation video encoding standard and in this process, MPEG issued a call for proposal of encoding algorithms. To evaluate these algorithms a large scale subjective test was performed involving Laboratories all over the world [(MPEG 2011; Baroncini 2012)]. For the participating Labs, it was...

  16. Novel kinematic indices for quantifying upper limb ability and dexterity after cervical spinal cord injury

    Reyes Guzmán, Ana de los; Dimbwadyo Terrer, Iris; Pérez Nombela, Soraya; Monasterio-Huelin Maciá, Felix; Torricelli, Diego; Pons Rovira, José Luis; Gil Agudo, Ángel
    Loss of motor function is a consequence after cervical spinal cord injury. Three-dimensional kinematic analysis equipments are used for quantifying human movements in clinical laboratories. These systems may provide objectivity to the patient assessments. Nowadays, the kinematic variables found in the literature have some defciencies, and the effcient management of these data sets is a demand and a challenge in the clinical setting. The aim of the present paper is to propose a set of novel kinematic indices, as a combination of kinematic variables, for quantifying upper limb motor disorders in terms of characteristics in relation to ability and dexterity...

  17. Free form metallization of solar cells using Laser Induced Forward Transfer

    Muñoz Martín, David; Chen, Yu; Canteli Pérez Caballero, David; Morales Furió, Miguel; Molpeceres Álvarez, Carlos Luis
    Front metallization is an expensive, fundamental step in the fabrication of solar cells. Laser additive direct writing techniques, such as Laser Induced Forward Transfer (LIFT), can be used for printing optimized metallization patterns or free form personalized designs with applications in building integrated photovoltaics. In this work, metallic fingers and busbars have been printed onto different rigid and flexible photovoltaic materials using commercial, high viscosity, micron-sized particles, silver-based pastes. Printed lines show very large aspect ratios, low electrical resistivity and good adherence to the substrate. Functional test cells have been metallized from unfinished CIGS flexible solar cells.

  18. Finite element method modeling applied to laser crystallization of amorphous silicon

    Canteli Pérez Caballero, David; Muñoz Martín, David; Morales Furió, Miguel; Molpeceres Álvarez, Carlos Luis
    The crystallization by laser of amorphous or microcrystalline silicon films allows to obtain thin, high-quality, polycrystalline Si films, being a very promising method for diminishing costs in the microelectronic and solar cells sectors. During a laser crystallization process, light is partially absorbed in the amorphous silicon film, heating the sample and, if the temperature rises high enough, causing the reorganization of the film structure into a crys- talline one. In this work we show both experimental results on the crystallization of non-hydrogenated silicon thin-films performed by a continuous wave infrared laser are included, as well as a study of the...

  19. Laser functionalization of surfaces

    Canteli Pérez Caballero, David; Márquez Fernández, Andrés; Muñoz Martín, David; Faleiro Rodríguez, Gabriel; Santamaría Riocerezo, Samuel; Lauzurica Santiago, Sara; Morales Furió, Miguel; Molpeceres Álvarez, Carlos Luis
    The treatment of surfaces by physical or chemical methods is a very usual way to change their original properties. Although the most common use of a surface functionalization is for tribology aims, modifications of the topography that leads to changes in the surface roughness, its hydrophilicity or hydrophobicity, its light scattering behavior, biocompatibility or even aesthetic changes are possible. In this field, laser sources have proven to be a most versatile and useful tool, being a clean and fast way to achieve any of those objectives. In this work we show the results of functionalization by laser texturing of four...

  20. Laser Direct Writing techniques for metallization of solar cells

    Muñoz Martín, David; Chen, Yu; Morales Furió, Miguel; Canteli Pérez Caballero, David; Molpeceres Álvarez, Carlos Luis
    Front metallization is an expensive, fundamental step in the fabrication of solar cells. It comprises different processes including the printing of fingers and busbars and several thermal treatments in order to cure and sinter the printed material. These two steps have been replaced by laser direct writing techniques, what allows printing fully personalized metallization designs, with high throughput velocities and a lower thermal budget for the solar cell structure.

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