Recursos de colección

Archivo Digital UPM (107.543 recursos)

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

Materia = Informática

Mostrando recursos 1 - 20 de 3.627

  1. Fast facial expression recognition for emotion awareness disposal

    Eckert, Martina; Gil Gaitán, Almudena; Zapatero Olmedillo, Diego; Meneses Chaus, Juan Manuel; Martínez Ortega, José Fernán
    This paper presents a simple and fast expression recognition algorithm aimed at running in a secondary plane to provide emotion awareness for primary applications as e.g. exergames, in real time. The algorithm is based on the extraction of 19 facial landmarks which are used to detect some of the Action Units (AUs) defined in the Facial Action Coding System (FACS) and a newly created one. In addition, the new concept of Combined Action Units (CAUs) is presented. Those are grouped AUs which are detected as a unit. The applied emotion classification is based on logical rules, no learning is involved....

  2. A modular middleware approach for exergaming

    Eckert, Martina; Gómez Martinho, Ignacio; Meneses Chaus, Juan Manuel; Martínez Ortega, José Fernán
    This paper presents the design of a new exergaming environment consisting of a modular middleware tool aimed at serving for intelligent adventure games. The middleware provides a modular and user-adaptive interface for data exchange between different devices (to date it supports a motion capture camera, a mobile phone, and a VR headset) and Blender. The target group is formed by young people between ages 6 to 26 with different physical diseases (muscular dystrophy, cerebral palsy, accidents, etc.). The gaming environment focuses especially on user awareness, immersion, and adaptability to special needs.

  3. MoKey - A motion based keyboard interpreter

    Eckert, Martina; López García, Marcos; Lázaro Basanta, Carlos; Meneses Chaus, Juan Manuel; Martínez Ortega, José Fernán
    In this paper the authors present a new middleware for mapping gestures, obtained by a motion sensing camera device, to key events which are consumed by a standard off-the-shelf application. The aim is twofold: accessibility for users which are not able to use the keyboard because of physical impairments and the use of standard games for doing physical exercises. Hereby, special attention is laid on the adaptability to user requirements and easiness of configuration for the user himself and non-expert assistants. The actual state of our system is compared to similar proposals in terms of usability and performance, finally future...

  4. A multi functional plug-in for exergames

    Eckert, Martina; Gómez Martinho, Ignacio; Meneses Chaus, Juan Manuel; Martínez Ortega, José Fernán
    This paper describes the development of a software complement for Blender (a freely available animation software) which allows to insert motion data obtained from a motion capture camera device. The main target is to provide Blender with a tool to develop exergames, i.e. serious games for performing physical exercises, which are fully adaptive to the user?s needs and capabilities, especially addressing chronical patients or handicapped. The plugin incorporates both: motion control and recording, allowing to store user movements. Transmission is realized via the OSC (Open Sound Control) protocol. The tool is still under development, here a first version is presented...

  5. SensoTrust: trustworthy domains in wireless sensor networks

    Castillejo Parrilla, Pedro; Martínez Ortega, José Fernán; López Santidrián, M. Lourdes; Sánchez Alcón, José Antonio
    Wireless sensor networks (WSNs) based on wearable devices are being used in a growing variety of applications, many of them with strict privacy requirements: medical, surveillance, e-Health, and so forth. Since private data is being shared (physiological measures, medical records, etc.), implementing security mechanisms in these networks has become a major challenge. The objective of deploying a trustworthy domain is achieving a nonspecific security mechanism that can be used in a plethora of network topologies and with heterogeneous application requirements. Another very important challenge is resilience. In fact, if a stand-alone and self-configuring WSN is required, an autosetup mechanism is...

  6. Failure detectors in homonymous distributed systems (with an application to consensus)

    Arévalo Viñuales, Sergio; Jiménez Merino, José Ernesto; Fernández Anta, Antonio; Imbs, Damien; Raynal, Michel
    ABSTRACT This paper is on homonymous distributed systems where processes are prone to crash failures and have no initial knowledge of the system membership (‘‘homonymous’’ means that several processes may have the same identifier). New classes of failure detectors suited to these systems are first defined. Among them, the classes HΩ and HΣ are introduced that are the homonymous counterparts of the Classes Ω and Σ, respectively. (Recall that the pair ⟨Ω, Σ⟩ defines the weakest failure detector to solve consensus.) Then, the paper shows how HΩ and HΣ can be implemented in homonymous systems without membership knowledge (under different synchrony requirements)....

  7. Social Engineering: I-E based Model of Human Weakness for Attack and Defense Investigations

    Fan, Wenjun; Kevin, Lwakatare; Rong, Rong
    Social engineering is the attack aimed to manipulate dupe to divulge sensitive information or take actions to help the adversary bypass the secure perimeter in front of the information-related resources so that the attacking goals can be completed. Though there are a number of security tools, such as firewalls and intrusion detection systems which are used to protect machines from being attacked, widely accepted mechanism to prevent dupe from fraud is lacking. However, the human element is often the weakest link of an information security chain, especially, in a human-centered environment. In this paper, we reveal that the human psychological...

  8. A Cooperative Decison Support System for Children's Neurodevelopment Monitoring.

    Martín Ruiz, María Luisa; Valero Duboy, Miguel Ángel; Gómez Oliva, Ana; Torcal Loriente, Carmen
    Decision Support Systems can enhance e-Health monitoring and IoT scenarios on the early detection of neurodevelopmental disorders in children. Thus, Ambient Intelligence could support innovative application domains like motor or cognitive impairments? detection at the home environment. The paper describes the design of an innovative cooperative system (Galatea) that supports the refinement process of a Knowledge Base expressed as an OWL ontology. The ontology supports decision-making process and is the core of: (1) a Web-Based Smart System aimed to enhance the screening of language disorders at medical centers and schools by fostering the identification of a developmental disorders before 4...

  9. Learning English is fun! Increasing motivation through video games

    Osma Ruiz, Víctor José; Saenz Lechón, Nicolás; Gutiérrez Arriola, Juana María; Argüelles Álvarez, Irina; Fraile Muñoz, Rubén; Marcano Ganzo, Roberto
    In this paper we present a study made with 16 university students with different levels of proficiency in English, who were divided into two groups: those with a basic level (B1 or lower) and those who had an advanced one (B2 or higher). These two groups had the opportunity to get to know and interact with a serious game developed in the ?Universidad Politécnica de Madrid? with the aim of helping in the teaching-learning process of English as a foreign language. Before and after the interaction, all students were interviewed on various aspects related to the English learning process. Although...

  10. Red de procesadores evolutivos para solucionar el problema de los tres colores : implementación en hardware

    Martínez Hernando, Víctor José; Gutiérrez Rodríguez, Abraham; Castaño Guevara, José Antonio; Moreno, Valery
    En este trabajo se diseña una Red de Procesadores Evolutivos (NEP) para solucionar el Problema de los Tres Colores. Para obtener el resultado, se utilizó como recurso de Hardware un FPGA. El objetivo principal de este trabajo, es demostrar la factibilidad de la implementación física de algoritmos paralelos para solucionar problemas NP ? Completos. Con esta implementación se logra que la ejecución de la solución al problema se haga de forma fiable, rápida y eficaz. El proyecto fue desarrollado usando la herramienta ISE 12.1 de Xilinx, utilizando como lenguaje de descripción de hardware al VHDL. Para la simulación se utilizó...

  11. Shape memory alloy-based high phase order motor

    Rossi, Claudio; Yuan, Zongjian; Zhang, Chao; Barrientos Cruz, Antonio; Coral Cuellar, William
    In this paper, we present our current work in the design and characterisation of a new shape memory alloy (SMA)-based High Phase Order Motor (HPOM). The motor can be used either in stepping mode or in servo mode of operation. Each phase of the motor consists of an SMA wire with a spring. The principle of operation of the HPOM is presented. In its operation the motor resembles a stepper motor though the actuation principles are different and hence has been characterised similar to a stepper motor.This motor can be actuated in either direction depending on which SMA is actuated,...

  12. Firefighter and victims protecting solution based on wireless body area network nodes

    Sanchez Alcón, Jose Antonio; Castillejo Parrilla, Pedro; Martinez Ortega, Jose Fernan; Lopez Santidrian, M. Lourdes
    Interconnectivity between Web systems and sensor networks is used to provide smart services for the Internet of Things. These services are based on data collection and processing to obtain useful information about the supervised environment. With this information it is possible to provide smart services, but some of them must be considered as protected by the legislation regarding privacy of personal data. In order to face this issue, security and privacy mechanisms must be used. So as to deal with the limited resources in sensor networks, these mechanisms must be as lightweight as possible to preserve the enough Quality of...

  13. Communication range dynamics using an energy saving self-adaptive transmission power controller in a wireless sensor network

    Lucas Martínez, Néstor; Martinez Ortega, José Fernán; Hernandez Diaz, Vicente; Toro Matamoros, Raúl del
    The deployment of the nodes in a Wireless Sensors and Actuators Network (WSAN) is typically restricted by the sensing and acting coverage. This implies that the locations of the nodes may be, and usually are, not optimal from the point of view of the radio communication. And also when the transmission power is tuned for those locations, there are other unpredictable factors that can cause connectivity failures, like interferences, signal fading due to passing objects, and of course, radio irregularities. A control based self-adaptive system is a typical solution to improve the energy consumption while keeping a good connectivity. In...

  14. Using end-to-end data encryption to secure SIP device configuration

    Chen, Xudong; Fan, Wenjun
    Security between the endpoints is an important requirement for network transmission. One existing solution of End-to-End security is based on the certificate of the third-party enterprise such as the authorization from ISP. And the other methods usually established a virtual private tunnel between the two endpoints. Considering the SIP device configuration basically used tftp protocol to transmit the configuration file, we proposed a free End-to-End security scheme using Application Gateway and data encryption to secure this transmission process. In this paper, Application Gateway used FastCGI programming to protect the HTTP server from attacking. On the other hand, the file encryption...

  15. Three-state disk model for high quality and energy efficient streaming media servers

    Du, Zhihui; Fan, Wenjun; Chai, Yunpeng
    Energy conservation and emission reduction is an increasingly prominent and global issue in green computing. Among the various components of a streaming media server, the storage system is the biggest power consumer. In this paper, a Three-State Disk Model (3SDM) is proposed to conserve energy for streaming media servers without losing quality. According to the load threshold, the disks are dynamically divided into three states: overload, normal and standby. With the requests arriving and departing, the disk state transition among these three states. The purpose of 3SDM is to skew the load among the disks to achieve high quality and energy efficiency...

  16. Infografía y arquitectura: dibujo y proyecto asistidos por ordenador

    Sainz Avia, Jorge; Valderrama, Fernando G.
    El ordenador ha entrado en el estudio del arquitecto, realidad incontestable que los profesionales han de aceptar. Muchos piensan que han llegado tarde a la informática, pero en realidad lo que ocurre es que no les resulta fácil modificar su método de trabajo. ¡Todavía son pocos los que ven con entusiasmo la posibilidad de concebir y diseñar sus proyectos desde el primer momento delante de una pantalla en lugar de sentarse en e! tablero de dibujo. La intención de este libro es llegar a todos los arquitectos que, no siendo expertos en informática, quieren utilizarla y sacar de ella todo...

  17. Relative fascicle excursion effects on dynamic strength generation during gait in children with cerebral palsy

    Martín Lorenzo, Teresa; Lerma Lara, Sergio; Martínez Caballero, Ignacio; Rocón de Lima, Eduardo
    Evaluation of muscle structure gives us a better understanding of how muscles contribute to force generation which is significantly altered in children with cerebral palsy (CP). While most muscle structure parameters have shown to be significantly correlated to different expressions of strength development in children with CP and typically developing (TD) children, conflicting results are found for muscle fascicle length. Muscle fascicle length determines muscle excursion and velocity, and contrary to what might be expected, correlations of fascicle length to rate of force development have not been found for children with CP. The lack of correlation between muscle fascicle length...

  18. Influence of common synaptic input to motor neurons on the neural drive to muscle in essential tremor

    Gallego Juárez, Juan Antonio; Dideriksen, Jacob L.; Holobar, Ales; Ibañez Pereda, Jaime; Pons Rovira, José Luis; Louis, Elan D.; Rocón de Lima, Eduardo; Farina, Darío
    Tremor in essential tremor (ET) is generated by pathological oscillations at 4 to 12 Hz, likely originating at cerebello-thalamo-cortical pathways. However, the way in which tremor is represented in the output of the spinal cord circuitries is largely unknown because of the difficulties in identifying the behavior of individual motor units from tremulous muscles. By using novel methods for the decomposition of multichannel surface EMG, we provide a systematic analysis of the discharge properties of motor units in 9 ET patients, with concurrent recordings of EEG activity. This analysis allowed inferring the contribution of common synaptic inputs to motor neurons...

  19. One central oscillatory drive is compatible with experimental motor unit behaviour in essential and Parkinsonian tremor

    Dideriksen, Jacob L.; Gallego Juárez, Juan Antonio; Holobar, Ales; Rocón de Lima, Eduardo; Pons Rovira, José Luis; Farina, Darío
    Pathological tremors are symptomatic to several neurological disorders that are difficult to differentiate and the way by which central oscillatory networks entrain tremorogenic contractions is unknown. We considered the alternative hypotheses that tremor arises from one oscillator (at the tremor frequency) or, as suggested by recent findings from the superimposition of two separate inputs (at the tremor frequency and twice that frequency). Approach. Assuming one central oscillatory network we estimated analytically the relative amplitude of the harmonics of the tremor frequency in the motor neuron output for different temporal behaviors of the oscillator. Next, we analyzed the bias in the...

  20. Artificial cognitive control with self-x capabilities: A case study of a micro-manufacturing process

    Haber Guerra, Rodolfo E.; Juanes Rodríguez, Carmelo; Toro Matamoros, Raúl Mario del; Beruvides López, Gerardo
    Nowadays, even though cognitive control architectures form an important area of research, there are many constraints on the broad application of cognitive control at an industrial level and very few systematic approaches truly inspired by biological processes, from the perspective of control engineering. Thus, our main purpose here is the emulation of human socio-cognitive skills, so as to approach control engineering problems in an effective way at an industrial level. The artificial cognitive control architecture that we propose, based on the shared circuits model of socio-cognitive skills, seeks to overcome limitations from the perspectives of computer science, neuroscience and systems...

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