Recursos de colección

Archivo Digital UPM (109.118 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 1.114

  1. Sistema de control electrónico de un sistema de pila de combustible PEM de baja potencia en configuración híbrida con baterías

    Medrano Gastañaga, Pablo
    Este Trabajo de Fin de Grado se enmarca dentro del primer proyecto llevado a cabo por la empresa Española de Pilas de Hidrógeno S.A. (EPHISA) cuyo objetivo es desarrollar un prototipo de pila de combustible de hidrógeno para una aplicación vehicular. EPHISA ha contratado al Centro de Electrónica Industrial (CEI) de la Escuela Técnica Superior de Ingenieros Industriales de la Universidad Politécnica de Madrid para que realice la parte electrónica del proyecto. El cometido de este trabajo dentro del proyecto mencionado anteriormente es el de implementar en código C el control desarrollado por el CEI de la pila de combustible en Simulink. Los...

  2. Desarrollo de un sistema de transmisión (Emisor/Receptor) de vídeo con módulos WiFi (IEEE802.11)

    Olmeda Asenjo, Álvaro
    Este Trabajo de Fin de Grado consiste en analizar las posibilidades de captura y transmisión de video por WiFi con dispositivos de bajo coste, desarrollando los sistemas necesarios para su funcionamiento y el control del conjunto del sistema. Para ello se ha utilizado la cámara OV7670, de muy bajo coste, con capacidad de capturar imágenes con resolución VGA (640x480) a una velocidad de 30 fotogramas por segundo. Para la lectura de los datos adquiridos por la cámara se utiliza el microcontrolador de 32 bits ESP8266 12-E, también de bajo coste, con una frecuencia máxima de funcionamiento de 160MHz y compatibilidad...

  3. Desarrollo de un motor de reconfiguración HW para plataformas Zynq

    García Santamaría, Laura
    El Trabajo de Fin de Grado (TFG) presentado en este documento consiste en el diseño de un motor de reconfiguración hardware, empleado para la reconfiguración parcial de una FPGA de la familia Zynq-7000. El objetivo fundamental de este trabajo es por tanto, conseguir desarrollar un controlador que permita gestionar completamente en hardware la reconfiguración dinámica y parcial de una FPGA de Xilinx empleando la herramienta de Vivado. Este tipo de reconfiguración, permite modificar parte de la FPGA manteniendo intacta la región estática, para ello es necesario el empleo de bitstreams parciales que solo reconfiguren la región dinámica. La motivación inicial...

  4. Optically enhanced photon recycling in mechanically stacked multijunction solar cells

    Steiner, Myles A.; Geisz, John F.; Ward, J. Scott; García Vara, Iván; Friedman, Daniel J.; King, Richard R.; Chiu, Philip T.; France, Ryan M.; Duda, Anna; Olavarria, Waldo J.; Young, Michelle; Kurtz, Sarah R.
    Multijunction solar cells can be fabricated by mechanically bonding together component cells that are grown separately. Here, we present four-junction four-terminal mechanical stacks composed of GaInP/GaAs tandems grown on GaAs substrates and GaInAsP/GaInAs tandems grown on InP substrates. The component cells were bonded together with a low-index transparent epoxy that acts as an angularly selective reflector to the GaAs bandedge luminescence, while simultaneously transmitting nearly all of the subbandgap light. As determined by electroluminescence measurements and optical modeling, the GaAs subcell demonstrates a higher internal radiative limit and, thus, higher subcell voltage, compared with GaAs subcells without the epoxy reflector....

  5. Study of resting state cortico-cortical synchronization aimed to accurately discriminate Parkinson and essential tremor patients: A MEG signal-space connectivity study

    Bruña Fernandez, Ricardo; Pineda Pardo, José Ángel; Rocón de Lima, Eduardo; Romero Muñoz, Juan Pablo; Benito León, Julián; Maestu Unturbe, Fernando
    Motor tremor-related syndromes like essential tremor (ET) and Parkinson?s disease (PD) have a common symptomatology in early stages: the presence of tremor. Even when both diseases have a different aetiology and, thus, different prognosis and treatment, the symptoms in early stages are quite similar. This usually leads to misdiagnosis, with the associated risks and limitations. A PD patient with an ET treatment will continue developing the disease, loosing an important window of action. On the other hand, an ET patient with a PD treatment will suffer strong side effects. A correct diagnosis is in both cases mandatory for the well-being...

  6. Mathematical modeling of neuronal connexin-36 channels

    Jaimes-Reátegui, Rider; Barrio, Luis C.; González Nieto, Daniel; Pisarchik, Alexander N.
    Neurotransmission through electrical synapses play an important role in the spike synchrony among neurons and oscillation of neuron networks. Connexin36 (Cx36) is the principal gap junction protein of electrical synapses between inhibitory interneurons in vertebrates. Coupling strength between coupled neurons is modulated, among other factor, by the voltage difference between cell interiors, termed transjunctional voltage (Vj), in a complex manner; with the Vj gradient junctional conductance of Cx36 channels first increases instantaneously (+ 20% for + 100 mV) and then it decreases slowly to half for a similar range of Vj. The significance of this regulation by voltage, a stimulus...

  7. Towards an adaptive hardware parallel particle filter

    Pérez Daza, David; Villaverde San José, Mónica; Moreno González, Félix Antonio
    A particle filter is a Montecarlo-based method suitable for predicting future states of non-linear systems with non-Gaussian noise. It is based on a set of samples of the state where each individual sample is called particle. These particles are weighted according to the real measure of the state in order to estimate the future state of the system.

  8. Novel cluster-based routing protocol optimization approach for wireless sensor mesh networking

    Gordillo, Javier; Mujica Rojas, Gabriel Noe; Portilla Berrueco, Jorge; Riesgo Alcaide, Teresa
    In this work, a novel and powerful mechanism for optimizing dynamic routing protocols in wireless se nsor mesh networking is deeply proposed and studied, by taking advantage and the benefits of flat-based routing techniques in combination with hierarchical strategies, so that a more efficient and energy/processing aware multi-path dissemination protocol is fully implemented. The communication and routing capabilities of W SN-based smart applications are key issues to be tackled in order to assure the reliability, scalability and long-term operability of the whole system. In order to accomplish such a challenging approach and targeting the on-site perf ormance analysis of routing protocols in...

  9. Testbed infrastructure for debugging, analyzing and optimizing WSN nodes based on a modular HW-SW architecture

    Mujica Rojas, Gabriel Noe; Portilla Berrueco, Jorge; Riesgo Alcaide, Teresa
    The Internet of Things has emerged as one of the key aspects to the future of the Wireless Sensor Networ ks and their impact in new applications in real environments. This concept poses new challenges in the implementation, testing and assessment of efficient, robust and reliable technologies and prototypes under this paradigm. In this way, the run-time remote interaction with the deployment of hundreds of in-f ield nodes in which developers have to be able to control and manage the wireless network anywhere at any time also implies new objectives to be achieved in order to adapt or even create new HW-SW...

  10. 45kW Full Bridge Converter with Discontinuous Primary Current for High Efficiency Airborne Application

    Bouvier, Yann; Vasic, Miroslav; Alou Cervera, Pedro; Oliver Ramírez, Jesús Angel; García Suárez, Oscar; Cobos Marquez, Jose Antonio
    This paper presents and describes the design and optimization process of a high power density 45kW DC/DC converter for aircraft application. This onverter is a part of an isolated rectifier for a military aircraft pulsating load. It has to provide galvanic isolation and good stability when the load steps as high as 40 kW are applied. In order to obtain high efficiency, on the primary side of the converter a discontinuous triangular current modulation is implemented. High power density is obtained by relatively high switching frequency of 10 kHz and by implementation of the transformer using a nanocrystalline material that enables...

  11. A WSN-Based intrusion alarm system to improve safety in road work zones

    Jiménez Martín, José Luis; Rozas Cid, Alba; Araujo Pinto, Álvaro
    Road traffic accidents are one of the main causes of death and disability worldwide. Workers responsible for maintaining and repairing roadways are especially prone to suffer these events, given their exceptional exposure to traffic. Since these actuations usually coexist with regular traffic, an errant driver can easily intrude the work area and provoke a collision. Some authors have proposed mechanisms aimed at detecting breaches in the work zone perimeter and alerting workers, which are collectively called intrusion alarm systems. However, they have several limitations and have not yet fulfilled the necessities of these scenarios. In this paper, we propose a...

  12. Reconfigurable writing architecture for reliable RRAM operation in wide temperature ranges

    García Redondo, Fernando; Royer del Barrio, Pablo; López Vallejo, Marisa; Aparicio Cerqueira, Hernán; Ituero Herrero, Pablo; López Barrio, Carlos Alberto
    Resistive switching memories [resistive RAM (RRAM)] are an attractive alternative to nonvolatile storage and nonconventional computing systems, but their behavior strongly depends on the cell features, driver circuit, and working conditions. In particular, the circuit temperature and writing voltage schemes become critical issues, determining resistive switching memories performance. These dependencies usually force a design time tradeoff among reliability, device endurance, and power consumption, thereby imposing nonflexible functioning schemes and limiting the system performance. In this paper, we present a writing architecture that ensures the correct operation no matter the working temperature and allows the dynamic load of application-oriented writing profiles....

  13. Hyperconnectivity is a fundamental response to neurological disruption

    Hillary, Frank G.; Román, Cristina A.; Venkatesan, Umesh; Rajtmajer, Sarah; Bajo Breton, Ricardo; Castellanos, Nazareth
    In the cognitive and clinical neurosciences, the past decade has been marked by dramatic growth in a literature examining brain "connectivity" using noninvasive methods. We offer a critical review of the blood oxygen level dependent functional MRI (BOLD fMRI) literature examining neural connectivity changes in neurological disorders with focus on brain injury and dementia. The goal is to demonstrate that there are identifiable shifts in local and large-scale network connectivity that can be predicted by the degree of pathology. We anticipate that the most common network response to neurological insult is hyperconnectivity but that this response depends upon demand and...

  14. Emotion regulation of neuroticism: emotional information processing related to psychosomatic state evaluated by electroencephalography and exact low-resolution brain electromagnetic tomography.

    Ikeda, Shunichiro; Mizuno-Matsumoto, Yuko; Canuet Delis, Leonides; Ishii, Ryouhei; Aoki, Yasunori; Hata, Masahiro; Katsimichas, Themistoklis; Pascual Marqui, Roberto D.; Hayashi, T; Okamoto, Eika; Asakawa, Tetsuya; Iwase, Masao; Takeda, M.
    Emotion regulation is the process that adjusts the type or amount of emotion when we experience an emotional situation. The aim of this study was to reveal quantitative changes in brain activity during emotional information processing related to psychosomatic states and to determine electrophysiological features of neuroticism. Twenty-two healthy subjects (mean age 25 years, 14 males and 8 females) were registered. Electroencephalography (EEG) was measured during an emotional audiovisual memory task under three conditions (neutral, pleasant and unpleasant sessions). We divided the subjects into two groups using the Cornell Medical Index (CMI): (CMI-I: control group, n = 10: CMI-II, III...

  15. External force estimation for telerobotics without force sensor

    Sol Acero, Enrique del; Pagala, Prithvi Sekha; King, Ryan; Ferre Pérez, Manuel
    This paper establishes an approach to external force estimation through the use of a mathematical model and current sensing, without employing a force/torque sensor. The advantages and need for force feedback have been well established in the field of telerobotics. This paper presents the requirement for sensorless force estimation and comparative results between a force sensor and the presented approach using an industrial robot. The approach presents not only a cost effective solution but also a solution for force sensing in hazardous environments, especially ionizing radiation prone environments where the dose rates limit the use of sensing equipment. The paper...

  16. Connectivity control in WSN based on fuzzy logic control

    Huang, Yuanjiang; Toro Matamoros, Raúl Mario del; Martinez Ortega, Jose Fernan; Hernandez Diaz, Vicente; Haber Guerra, Rodolfo E.
    The connectivity of a wireless sensor network (WSN), specified as the percentage of nodes that are able to reach the base station (BS) that relays nodes data to other networks, has to be kept as high as possible, without either increasing significantly the energy consumption or worsening the WSN overall performance. Modelling accurately a WSN and designing a control system for accomplishing the desired network connectivity is an effortful task. In this paper, an approach based on fuzzy logic control is proposed, as it provides a better trade-off between accuracy, effort and time. The control system running in each node...

  17. Biblioteca para la implementación rápida de controles digitales sobre DSP

    Rubio Lozano, Juan José
    Con el aumento de la demanda energética y nuevas aplicaciones como el vehículo eléctrico, está creciendo también la demanda de convertidores de potencia para gestionar las transformaciones que debe sufrir la energía empleada. Para el control de esos convertidores cada vez se apuesta más por alternativas de control digitales frente a los controles analógicos clásicos, ya que el control digital soluciona los alguno de los problemas del control analógico, como las irregularidades que pueden introducir los componentes o las desviaciones del control por la degradación de los mismos. Además, ofrece diversas ventajas como pueden ser la posibilidad de desarrollar algoritmos...

  18. Modelado y control de la humedad y la temperatura en un invernadero mediante autómatas programables.

    López Sobrino, David
    Un invernadero es una estructura cerrada, estática y aislada dedicada a la producción de uno o varios cultivos de plantas. Para poder sacar el mayor rendimiento de este cultivo, tenemos que mantener una serie de variables, como son la temperatura, la humedad, la luz y el CO2, en unos valores óptimos. Por ello nace la necesidad de regular estos parámetros. Este Proyecto Fin de Grado se centra en dos de estas variables, la temperatura y la humedad. Antes de pensar en regular estas dos variables, primero, tendremos que conocer su comportamiento dentro del invernadero, para ello identificaremos el sistema. Identificando el...

  19. Comparison of models and standards for implementing IT service capacity management

    Feliz Sánchez, Alleinni; Calvo-Manzano Villalon, Jose Antonio
    Due to the recent and significant growth of the information technology (IT) services, industries need some sort of framework and / or standards for the management of their services, especially IT services. So, it becomes necessary and essential to define and adopt a set of best practices for providing and effectively managing the technology and services offered throughout its life cycle. Currently, the management of IT applications and services becomes more complex. Predicting and controlling the problems associated with system performance and capacity planning has become a difficult task. For large IT projects, the costs related to performance tuning, performance...

  20. Synchronization of intermittent behavior in ensembles of multistable dynamical systems

    Sevilla Escoboza, Ricardo; Martín Buldú, Javier; Pisarchik, Alexander N.; Boccaletti, Stefano; Gutierrez, Ricardo
    We propose a methodology to analyze synchronization in an ensemble of diffusively coupled multistable systems. First, we study how two bidirectionally coupled multistable oscillators synchronize and demonstrate the high complexity of the basins of attraction of coexisting synchronous states. Then, we propose the use of the master stability function (MSF) for multistable systems to describe synchronizability, even during intermittent behavior, of a network of multistable oscillators, regardless of both the number of coupled oscillators and the interaction structure. In particular, we show that a network of multistable elements is synchronizable for a given range of topology spectra and coupling strengths,...

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