Person:
Recas Piorno, Joaquín

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First Name
Joaquín
Last Name
Recas Piorno
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Informática
Department
Arquitectura de Computadores y Automática
Area
Arquitectura y Tecnología de Computadores
Identifiers
UCM identifierORCIDScopus Author IDWeb of Science ResearcherIDDialnet IDGoogle Scholar ID

Search Results

Now showing 1 - 10 of 16
  • Publication
    Profundización en la sensibilización y formación en la accesibilidad e inclusión de las personas con discapacidad visual al proceso de enseñanza-aprendizaje dentro de la UCM
    (2022-06-29) Recas Piorno, Joaquín; Arbues Bedia, Jose; Bermudez Cabra, Antonio; Carreño Gea, Pablo; Carrera García, Juan Manuel; González Montero, María Guadalupe; González Vides, Leonela; Guerra Gallegos, Michelle Benacir; Guijarro Mata-García, María; Gutiérrez Hernández, Ángel Luis; Maestro Mañanes, Enrique; Martín Pérez, Yolanda; Muñoz Carenas, Jaime; Peña Quineche, David; Rodríguez Montes, María; Santos Peñas, Matilde; Valor Yebenes, Juan Antonio; Zuloaga Uria, Luis
    El presente proyecto, SENSIVISUAL-UCM-II, supone una continuidad en los procesos de formación y sensibili-zación de la comunidad universitaria en el uso de tecnologías de información y comuni-cación, TICs, accesibles para personas con discapacidad visual, donde debe prevalecer el derecho a la atención equitativa y de calidad, permitiendo su plena inclusión educativa y social, mediante el respeto a sus necesidades específicas. El presente proyecto conti-nua con el trabajo realizado y pretende ahondar en la adecuación de contenidos docen-tes mediante el uso de herramientas concretas que mejoren el proceso de enseñanza-aprendizaje para personas con déficit visual, siguiendo con el objetivo de la plena inclu-sión de estos alumnos en el aula. SENSIVISUAL-UCM-II persigue la mejora de la calidad docente y de los servicios vinculados a procesos de innovación en materia de inclusión y diversidad, centrándose en los alumnos con discapacidad visual, y bajo la referencia del Aprendizaje por Servicio. La propuesta educativa de este proyecto combina proce-sos de aprendizaje y de servicio a la comunidad en un mismo proyecto, en el que los compañeros de las personas con discapacidad visual aprenden, generando los materia-les didácticos y potenciando el trabajo colaborativo en los grupos de clase, a la vez que trabajan en necesidades reales de la comunidad con la finalidad de mejorarla. Bajo este objetivo, las acciones llevadas a cabo harán que la comunidad universitaria, tanto profe-sores, alumnos como personal de administración y servicios, se implique en la mejora de la institución en su conjunto y del servicio que ésta ha de dar a la sociedad, consiguiendo colocarnos como universidad de referencia en accesibilidad e inclusión.
  • Publication
    A fast autonomous scaled ship for experimental seakeeping control studies
    (IEEE, 2005) Esteban San Román, Segundo; Recas Piorno, Joaquín; Girón Sierra, José María; Cruz García, Jesús Manuel de la; Riola, J. M.
    A second part of our research on the seakeeping control in fast ferries, is devoted to general heading and sea state conditions. Although scaled ships are basis for experimental studies, it is not possible to keep using them in towing tanks. The main reason is that high speeds require large space for experiments, so towing tanks are not large enough. This has been noticed after the first part of our research, with head seas, in a 150m x 30m towing tank with wavemaker. Consequently, we are preparing for open air experiments. A new fast autonomous scaled ship has been developed. She is self-propelled, and is self-governed by an embedded PC on-board. The ship carries sensors for heading, speed and seakeeping control. Several scaled moving appendages have been added: two transom flaps, two lateral fins, and a T-foil. The ship uses two scaled waterjets, which also control the heading: the ship has no rudder. A distributed monitoring and control system has been designed and implemented for on-board operation. All equipment has to be very light, since the real fast ferry that we reproduce at 1/40 scale is aluminium made. A digital radio link has been provided for distant off-shore monitoring. The paper describes the autonomous ship, the on-board monitoring and control system, and shows several experimental results with quiet waters and with several types of waves.
  • Publication
    Experimental framework for autonomous fast ships's control design
    (World Scientific and Engineering Acad and Soc, 2005) Recas Piorno, Joaquín; Esteban San Román, Segundo; Girón Sierra, José María; Cruz García, Jesús Manuel de la
    The research on seakeeping control of fast ships requires difficult experiments for modeling and control design. To alleviate the ship motion certain active appendages are added, such moving flaps, T-foil and fins. The motion of appendages must be optimized to counteract each encountered wave. During our first research steps, a scaled down ship, with scaled appendages, has been used in a towing tank facility. The scaled ship is towed at fixed speeds of experimental interest, for instance at the equivalent to 40 knots. The wavemaker in the towing tank is used to generate specified waves. Along the experiments it was noticed that the towing of the replica spoils certain expected phenomena. A more appropriate way of doing experiments to observe all ship motions, is to use an autonomous self-propelled scaled ship. In this paper a new autonomous scaled ship is presented. It contains an on-board control system, so the ship is self-governed. Complex maneuvering can be programmed for certain study interests. Our autonomous ship is linked via radio with an external monitoring system. The ship and the off-shore monitoring system constitute an experimental framework for advanced studies about fast ship control.
  • Publication
    Frequency-domain analysis for prediction of seasickness on ships
    (Soc Naval arch Marine Eng, 2005-10) Esteban San Román, Segundo; Girón Sierra, José María; Recas Piorno, Joaquín; Cruz García, Jesús Manuel de la
    Oscillatory vertical motions of ships cause seasickness. There is a mathematical model that can be used to compute the percent of passengers who will get sick caused by vertical motions, However, the application of the mathematical model requires obtaining 2 hours of records of experimental or simulated ship motion data. Based on a filters analogy, this article proposes a new frequency-domain method for the calculation of seasickness incidence. The method can be applied to any sea power spectrum and any ship. Because it is based on response amplitude operators or transfer functions, which can be obtained with seakeeping simulation programs, the method can be applied even before the ship is built. The results of the method can be useful for ship design and for the analysis of best operation for passenger comfort.
  • Publication
    Distributed electronic system for monitoring and control of a fast ship physical model
    (IEEE, 2003) Girón Sierra, José María; Esteban San Román, Segundo; Recas Piorno, Joaquín; Andrés Toro, Bonifacio de; Besada Portas, Eva; Cruz García, Jesús Manuel de la
    This paper is related with a research on vertical motion alleviation of fast ferries. A scaled down replica of a fast ferry was built, for experimental studies in a towing tank facility. Some submerged moving actuators were added to the replica: a pair of transom flaps, lateral fins and a T-foil near the bow. Two series of experiments with waves generated in a large basin must be done. One of the series is devoted to modelling, and the second for model-based control studies. Due to the fast motions of the experimental ship, it is not possible to attach it to a computerized carriage with instrumentation (it is part of the towing tank facility). Instead, the experimental ship must be autonomous, with all monitoring and control systems on board. Since there are six motions of the ship to be considered, the number of on-board sensors and actuators, and the complexity of control, take us to decide the design of a distributed electronic system. It is based on a central embedded PC, several microcomputer nodes, and the CANbus. The on board system interacts, using a wireless data link, with an off-shore experiment control and data processing system, with an interesting visualization performance. The purpose of the paper is to introduce this system and the associated experimental framework.
  • Publication
    A Link Quality Estimator for Power-Efficient Communication over On-Body Channels
    (2014) Recas Piorno, Joaquín; Ayala Rodrigo, José Luis; Vallejo, Mónica
    The human body has an important effect on the performance of on-body wireless communication systems. Given the dynamic and complex nature of the on-body channels, link quality estimation models are crucial in the design of mobility management protocols and power control protocols. In order to achieve a good estimation of link quality in WBSNs, we combine multiple body-related factors into a model that includes: the transmission power, the body position, the body shape and composition characteristics and the received signal strength indicator (RSSI) as an indicator of link quality. In this paper, we propose the Anfis Link Quality Estimator (A-LQE) that has been trained with RSSI values measured at different transmission power levels in a sample of 37 human subjects. Once the accuracy and reliability of our proposed model have been analysed, we apply the model to adapt the transmission power to the link characteristics for energy optimization. The obtained average energy savings reach the 26% in comparison with the maximum transmission power mode.
  • Publication
    Framework libre para el desarrollo de aplicaciones en el escenario de “Internet of Things”
    (2017-05-26) Del Barrio García, Alberto Antonio; Roa Romero, Carlos; Recas Piorno, Joaquín; Botella Juan, Guillermo; Tenllado Van Der Reijden, Christian Tomas; Piñuel Moreno, Luis
    Cada placa de desarrollo tiene su propio entorno de trabajo. El objetivo del proyecto es preparar un framework único para desarrollar aplicaciones en múltiples placas. Estará basado en software libre, por lo que será accesible a todos los alumnos.
  • Publication
    Framework para el desArroLLo ágIl de código RTL orientAdo a programadores software, ingeNieros y CiEntíficos (ALLIANCE)
    (2018-09-28) Botella Juan, Guillermo; Barrio García, Alberto Antonio del; Recas Piorno, Joaquín; García Sánchez, Carlos; Ezquerro Rodríguez, José Miguel; Roa Romero, Carlos; Fariña Fernández, Daniel; López Alonso, José Manuel; Cao García, Francisco Javier; Sierra López, Ángel
    Las FPGAs en el contexto científico tienen una gran importancia debido a su capacidad de procesamiento paralelo, sus características de bajo coste y bajo consumo como plataformas de aceleración. Compañias bien conocidas y establecidas en el desarrollo de herramientas científicas como Mathworks han desarrollado herramientas de síntesis de alto nivel que acelera el proceso de diseño. El siguiente proyecto de Innovación docente hace uso de estas herramientas para desarrollar una plataforma de aceleración útil en contextos educativos (específicamente en asignaturas científico técnicas impartidas en la UCM). Se genera un entorno basado en el paradigma FPGA-in-the-Loop mediante Simulink que permite ejecutar los modelos directamente en la FPGA. Se presentarán resultados que darán cuenta de precisión, performance, asimismo se establecerán comparativas respecto a modelos usando un paradigma de desarrollo clásico.
  • Publication
    Identificación de problemas y necesidades en la docencia virtual surgidos por la crisis sanitaria en la Facultad de Óptica y Optometría. Propuesta y planificación de soluciones y nuevas herramientas
    (2021-06-26) Gutiérrez Hernández, Ángel Luis; Camargo Mínguez, Ana María; González Montero, Guadalupe; Guijarro Mata-García, María; López Ibáñez, Manuel; Martín Pérez, Yolanda; Recas Piorno, Joaquín; Santos Peñas, Matilde
    La situación de pandemia y alerta sanitaria ha obligado a todos los miembros de la comunidad educativa a adaptarse a la situación de docencia virtual ante la imposibilidad de continuar con las clases presenciales. Existe una gran variedad de necesidades debido a la diversidad de situaciones tanto personales (en cuanto a formación del profesorado y alumnos en la utilización de recursos virtuales, conocimiento de los recursos existentes y más adecuados…) como materiales (disponibilidad de material informático adecuado tanto de profesores como de alumnos). En la Facultad de Óptica y Optometría, como en el resto de centros de la UCM, se ha hecho un gran esfuerzo durante estos meses, y se sigue trabajando en ello, para conocer las necesidades de los profesores y alumnos en esta situación y poder dar respuesta a todas ellas. Nuestro proyecto persigue la identificación y análisis de esas necesidades y problemas de profesores y estudiantes, que, anque circunscrito al ámbito de la Facultad de Óptica y Optometría, quizá pueda extrapolarse en cierta medida al resto de la comunidad académica, para poder plantear y planificar estrategias para enfrentarse a las situaciones similares que pudieran darse en el futuro.
  • Publication
    Generic Markov Model of the Contention Access Period of IEEE 802.15.4 MAC Layer
    (Elsevier, 2014-10) Recas Piorno, Joaquín; Khaled, Nadia; Barrio García, Alberto Antonio Del; Hermida Correa, Román
    The IEEE-802.15.4 standard is poised to become the global standard for low data rate, low energy consumption Wireless Sensor Networks. By assigning the same sets of contention access parameters for all data frames and nodes, the Contention Access Period (CAP) of the slotted IEEE-802.15.4 currently provides an even channel access functionality and no service differentiation. However, some applications may require service differentiation and traffic prioritization support to accommodate high-priority traffic (e.g., alarms). In order to simulate a scenario in which different sets of access parameters for different node classes can be configured, this paper develops a Markov-chainbased model of the CAP of the IEEE-802.15.4-MAC. Our Markov model can be used to evaluate the impact of mixing node classes in important factors like the throughput, energy consumption, probability of delivery and the packet latency. The model has been used to provide traffic differentiation in a high saturation scenario in which a set of nodes can be configured to increase 76% the probability of sending a packet and reduce 58% latency, with a 69% energy penalty, in comparison with a standard scenario. The accuracy of the Markov model is validated by extensive ns-2 simulations.