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 = Telecomunicaciones

Mostrando recursos 1 - 20 de 3.493

  1. Automatic synthesis of anthropomorphic pulmonary CT phantoms

    Jimenez Carretero, Daniel; Estepar San José, Raúl; Díaz Cacio, Mario; Ledesma Carbayo, María Jesús
    The great density and structural complexity of pulmonary vessels and airways impose limitations on the generation of accurate reference standards, which are critical in training and in the validation of image processing methods for features such as pulmonary vessel segmentation or artery–vein (AV) separations. The design of synthetic computed tomography (CT) images of the lung could overcome these difficulties by providing a database of pseudorealistic cases in a constrained and controlled scenario where each part of the image is differentiated unequivocally. This work demonstrates a complete framework to generate computational anthropomorphic CT phantoms of the human lung automatically. Starting from...

  2. Integration of Multisensorial Stimuli and Multimodal Interaction in a Hybrid 3DTV System

    Luque Oostrom, Francisco Pedro; Galloso Guitard, Iris; Feijoo Gonzalez, Claudio Antonio; Martín Edo, Carlos Alberto; Cisneros Perez, Guillermo
    This article proposes the integration of multisensorial stimuli and multimodal interaction components into a sports multimedia asset under two dimensions: immersion and interaction. The first dimension comprises a binaural audio system and a set of sensory effects synchronized with the audiovisual content, whereas the second explores interaction through the insertion of interactive 3D objects into the main screen and on-demand presentation of additional information in a second touchscreen. We present an end-to-end solution integrating these components into a hybrid (internet-broadcast) television system using current 3DTV standards. Results from an experimental study analyzing the perceived quality of these stimuli and their...

  3. Signal penalties induced by different types of optical filters in 100 Gbps PM-DQPSK based optical networks

    Chen, Xiaoyong; Martín Pereda, José Antonio; Rodríguez Horche, Paloma
    Optical filters are crucial elements in optical communication networks. However, they seriously affect the signal quality, especially in the concatenation condition. In this paper, we study and simulate the signal penalties induced by five types of filters, including Butterworth, Gaussian, Bessel, Fiber Bragg Grating (FBG) and Fabry–Perot (F–P) filters, in order to optimize the optical network performance. Signal penalties, including both filter concatenation effect and filter induced in-band and out-band crosstalk, are analyzed by eye opening penalty (EOP) and Q-penalty. Simulation results show that the Butterworth filter performs best among these four types of filters. Total Q-penalty induced by a...

  4. ¿Qué vemos cuando miramos?

    Martín Pereda, José Antonio
    Reflexión sobre cómo funciona el sentido de la vista, cómo interpreta nuestro cerebro las señales recibidas y cómo una nueva ciencia (la neurofotónica) puede propiciar la conexión con los mecanismos internos del cerebro, todavía un misterio para la ciencia, y que permiten formar la imagen

  5. MEG functional network disorganization associates with cerebrospinal fluid biomarkers in early Alzheimer’s disease

    Canuet Delis, Leonides; Pusil Arce, Sandra; López García, María Eugenia; Bajo Breton, Ricardo; Pineda Pardo, José Ángel; Cuesta Prieto, Pablo; Gaztelu Quijano, José María; Lourido, Daniel; García Ribas, Guillermo; Maestú Unturbe, Fernando
    To determine whether functional connectivity patterns, as an index of synaptic dysfunction, associate with cerebrospinal fluid (CSF) biomarkers (i.e., phospho-tau and amyloid beta -A 42- levels) in patients with Mild Cognitive Impairment due to Alzheimer?s disease. We also assessed orrelations of aberrant functional connections with structural connectivity abnormalities and with cognitive deficits

  6. Impact of the BDNF Val66Met polymorphism within and beyond the retrosplenial cortex in females with Mild Cognitive Impairment: A magnetoencephalography study

    Rodríguez Rojo, Inmaculada C.; Cuesta Prieto, Pablo; López García, María Eugenia; Barabash, Ana; Cabranes, José Antonio; Delgado Losada, María Luisa; Yus, Miguel; Marcos Dolado, Alberto; Maestú Unturbe, Fernando
    Mild Cognitive Impairment (MCI) can be influenced by genetic risk factors. The Brain Derived Neurotrophic Factor Val66Met polymorphism is one of them. This mutation may affect the brain functional connectivity (FC), especially for those carriers of the Met allele (A). The retrosplenial cortex (RSC), essential component of the Default Mode Network (DMN), could be altered by this polymorphism. Our aim was to examine the influence of the Val66Met polymorphism within the RSC?s functional network, and its interconnections between the frontal medial cortex (FMC) and the anterior cingulate (ACC).

  7. Artificial-intelligence-augmented telemedicine applied to the management of diet-treated gestational diabetes

    Rigla Cros, Mercedes; García Sáez, Gema; Villaplana, María; Caballero Ruiz, Estefanía; Pons, Belén; Aguilar, Montserrat; Méndez, Anna; Gómez Aguilera, Enrique J.; Hernando Pérez, María Elena
    Gestational diabetes (GD) confers an increased risk of complications as well as future type 2 diabetes. We assess the safety and efficacy of an artificial intelligence (AI)-augmented telemedicine system (ruled-based reasoning) that includes a blood glucose (BG) classifier (C4.5 Quinlan decision tree) in comparison with the standard care in the management of GD while insulin is not required.

  8. Connexin-36 protects against suddent infant death syndrome

    Pérez Atencio, L,.; Ardaiz, M.; Barios Heredero, Juan Antonio; González Nieto, Daniel; Barrio, L.C.
    The sudden infant death syndrome (SIDS) is the main cause of postneonatal infant death; however the etiology of SIDS remains ill defined. The hypothesis that SIDS, or a subset of SIDS, is due to an abnormal brainstem mechanism is one of the current leading hypotheses on SIDS etiology. The brainstem is essential for cardiac and respiratory function, controlling autonomic and homeostatic responses including breathing, central chemosensitivity, heartbeat and blood pressure, all mechanisms that are thought to be involved in SIDS. Connexin-36 (Cx36), the principal component of neuron-to-neuron channels that form the electrical synapses, is present in the specific neural populations...

  9. 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....

  10. Herramientas de modelado para Bioingeniería, casos de estudio: a) Antena de relajometría por Resonancia Magnética, b) Bobina generadora de gradientes magnéticos

    Maestre Rendón, Juan Rodolfo; Amaya Jaramillo, Carlos David; Félix González, Nazario; Pozo Guerrero, Francisco del; Serrano Olmedo, Jose Javier
    En el campo de la imagenología, clínica, la resolución y el contraste de imágenes médicas es el reto a obtener por los radiólogo en cada estudio o adquisición obtenida, aunque existen diversas técnicas de software que ayudan a apreciar de manera favorable estos conceptos, su potenciación es determinada por la tecnología del equipo y la intensidad de su campo magnético, este último concepto asociado para la técnica de Resonancia Magnética Nuclear. En la actualidad existe un método alternativo, que permite observar de manera eficaz ciertas regiones o secciones anatómicas diana, y con una mayor claridad visual que las técnicas actualmente...

  11. Avances en el diagnóstico de la discapacidad auditiva: técnica de la audiometría por Microfónicos Cocleares

    Félix González, Nazario; Casonava Carvajal, Óscar; Sánchez López de Pablo, Cristina; Blas Narváez, L; Padilla, M. F.; Serrano Olmedo, José Javier
    Los problemas de audición que hacen necesario el uso de audífonos afectan a todo tipo de personas, pero especialmente a aquellas que presentan dificultades para realizar la audiometría tonal subjetiva por su falta de colaboración en la prueba. La inexistencia de pruebas de audiometría objetivas equivalente a la tonal da lugar a un impreciso diagnóstico y a un dudoso tratamiento. Los microfónicos cocleares son señales eléctricas producidas por las células ciliadas internas y externas al estímulo de la presión sonora vibrátil del sonido. La determinación de la audición hasta la cóclea inclusive permite separar los problemas de audición según su...

  12. A multidisciplinary reference framework to support implementation and assessment of diabetes care in community settings: study design

    Fico, Giuseppe; Arredondo Waldmeyer, Maria Teresa
    Diabetes is a disease presenting multifaceted challenges. A holistic approach is needed to properly address it. The Chronic Care Model, worldwide reference for managing chronic disease in community settings, support implementation at micro-meso--macro level. We present a multi-disciplinary framework that support the uptake of the Chronic Care Model. This framework was tested to support the implementation of a research project focused on Diabetes Management through personal health systems.

  13. User centered design to incorporate predictive models for type 2 Diabetes screening and management into professional decision support tools: preliminary results

    Fico, Giuseppe; Hernández González, Liss; Cancela González, Jorge; Arredondo Waldmeyer, Maria Teresa
    Type 2 Diabetes screening and risk stratification tools could benefit from the incorporation of predictive systems based on computer modelling. The adoption of User Centered Design techniques is fundamental in order to integrate these systems in an effective and successful way. The work presented in this paper describe the methodologies used in the context of a multidisciplinary research project and provides an overview of the preliminary results. Keywords? User Centered Design, Predictive Modelling and Data Mining, Diabetes Screening and Risk Stratification, Decision Support Tools.

  14. Study, design and validation of a framework model for smoke and particle-filled atmospheres

    Nadal Serrano, José María
    La visión es el sentido que aporta la mayor cantidad de información sobre conciencia situacional en humanos. Esto es relevante en el caso de pérdidas temporales de visión por parte de profesionales por sus implicaciones en seguridad -en especial durante la realización de tareas de riesgo-. Esta tesis aporta una serie de contribuciones para facilitar el desarrollo futuro de dispositivos capaces de solventar los riesgos y problemas asociados a ese tipo de ceguera temporal. En primer lugar se da una visión general de concepto desde una perspectiva de teledetección. Se analiza el estado del arte de varias tecnologías en uso...

  15. 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...

  16. 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....

  17. Sematch: semantic entity search from knowledge graph

    Zhu, Ganggao; Iglesias Fernandez, Carlos Angel
    As an increasing amount of the knowledge graph is published as Linked Open Data, semantic entity search is required to develop new applications. However, the use of structured query languages such as SPARQL is challenging for non-skilled users who need to master the query language as well as acquiring knowledge of the underlying ontology of Linked Data knowledge bases. In this article, we propose the Sematch framework for entity search in the knowledge graph that combines natural language query processing, entity linking, entity type linking and semantic similarity based query expansion. The system has been validated in a dataset and...

  18. Thin film electroacoustic resonators for physical and chemical sensing

    Mirea, Teona
    The fields of application of sensing devices are constantly expanding. From industrial processes monitoring to food quality control, sensors play a key role as information collectors, essential for human safeness, costs reduction and efficiency improvement. Their impact is even more pronounced in fields like the healthcare one, where biosensors have become crucial for prognosis and early diagnosis. As a result, high performance, low cost and reliable sensors are more and more demanded. In this context thin film electroacoustic sensors offer high resolution, high sensitivity, simplicity, low size, low manufacturing costs and possibility for array integration. Among this class of devices,...

  19. Deployment of a smart telecare system to carry out an intelligent health monitoring at home

    Vadillo Moreno, Laura; Martín Ruiz, María Luisa; Valero Duboy, Miguel Ángel
    Information and Communication Technologies together appropriate reasoning tools can add value to current telecare systems, including smart tele-monitoring solutions to enhance the capability for identifying risk situations at home. Cooperation between Home Area Networks (HAN) and Body Area Networks (BAN) at home can provide smart systems to support effective health solutions for ageing people living alone, improving service quality and security to the users and relatives. This paper details the development of a reasoning platform to monitor situations of the person at home, and react in risk situations that demanding care support of remote careers. The system integrates BAN and...

  20. Measurement of BepiColombo mission Medium Gain Antenna parameters

    Sánchez, Victor; Barrio, Aingeru; Martín, Fernando; Pinto, Iñaki; García, Rafael; Haro Ariet, Leandro de; Besada Sanmartín, José Luis; Galocha Iraguen, Belén; Sierra Castañer, Manuel
    This paper is aimed to explain the radiation test in temperature performed on the radiofrequency assembly (RFA) of the Medium Gain Antenna (MGA) of ESA BepiColombo mission. The goal of this mission is to observe and study Mercury and its surroundings in a very demanding and stringent environment in terms of temperature and radiation. The paper presents the measurement set-up for the qualification campaign of the antenna, where it was necessary to characterize the antenna in a representative thermal environment.

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