Actas de Congresos

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Now showing 1 - 20 of 51
  • Publication
    Performance evaluation of Private and Public Blockchains for multi-cloud service federation
    (Association for Computing Machinery (ACM), 2024) Zahir, Adam; Groshev, Milan; Antevski, Kiril; Bernardos Cano, Carlos Jesús; Ayimba, Constantine; Oliva Delgado, Antonio de la; European Commission; Ministerio de Asuntos Económicos y Transformación Digital (España)
    The stringent low-latency, high reliability, availability and resilience requirements of 6G use cases will present challenges to cloud providers. Currently, cloud providers lack simple, efficient, and secure implementation of provisioning solutions that meet these challenges. Multi-cloud federation is a promising approach. In this paper, we evaluate the application of private and public blockchain networks for multi-cloud federation. We compare the performance of blockchain-based federation in private and public blockchain networks and their integration with a production-ready orchestration solution. Our results show that the public blockchain needs approximately 91 seconds to complete the federation procedure compared to the 48 seconds in the private blockchain scenario.
  • Publication
    FoReCo: a forecast-based recovery mechanism for real-time remote control of robotic manipulators
    (ACM, 2022) Groshev, Milan; Sacido, Javier; Martín Pérez, Jorge; European Commission
    This demonstration presents FoReCo [4], a solution to recover lost control commands in remotely controlled robots. In the demonstration, visitors use a joystick to remotely control a robotic arm under the presence of packet losses in the wireless medium. The lost control commands result in a distorted trajectory of the robotic arm, thus, we deploy FoReCo to recover lost control commands using an ML model that we train with a real-world dataset. The demonstration shows how FoReCo recovers the lost commands, and how the robot arm operates smoothly despite the losses that are present in the wireless medium.
  • Publication
    Technology, Movement, and Play Is Hampering and Boosting Interactive Play
    (Association For Computing Machinery (ACM), 2023-10-10) Van Delden, Robby; Reidsma, Dennis; Postma, Dees; Weijdom, Joris; Márquez Segura, Elena; Turmo Vidal, Laia; Vega Cebrián, José Manuel; Tajadura Jiménez, Ana; Waern, Annika; Park, Solis; Hämäläine, Perttu; Johnsson, Mats; Rasmussen, Lærke Schjødt; Elbæk, Lars; European Commission
    In this paper, we highlight how including technology, movement or play can boost a design process but with unbalanced amounts can also hamper the process. We provide a set of examples where we miscalculated the amount of technology, movement, or play that was needed in a design activity in such a way that it became counterproductive and for each example mention possible adaptations. Finally, we highlight three existing approaches that can balance the overabundance of technology, movement, and play in design processes: activity-centered design, somaesthetic design, and perspective-changing movement-based design.
  • Publication
    On Futuring Body Perception Transformation Technologies: Roles, Goals and Values
    (Association For Computing Machinery (ACM), 2023-10-03) Turmo Vidal, Laia; Vega Cebrián, José Manuel; D'Adamo, Amar; Roel Lesur, Marte Ernesto; Dehshibi, Mohammad Mahdi; Díaz Durán, Joaquín Roberto; Tajadura Jiménez, Ana; European Commission
    Body perception transformation technologies augment or alter our own body perception outside of our usual bodily experience. As emerging technologies, research on these technologies is limited to proofs-of-concept and lab studies. Consequently, their potential impact on the way we perceive and experience our bodies in everyday contexts is not yet well understood. Through a speculative design inquiry, our multidisciplinary team envisioned utopian and dystopian technology visions. We surfaced potential roles, goals and values that current and future body perception transformation technologies could incorporate, including non-utilitarian purposes. We contribute insights on such roles, goals and values to inspire current and future work. We also present three provocations to stimulate discussions. Finally, we contribute methodologically with insights into the value of speculative design as a fruitful approach for articulating and bridging diverse perspectives in multidisciplinary teams.
  • Publication
    Sistema de seguimiento de trayectoria de un vehículo mediante control H∞ por realimentación de salidas considerando perturbaciones en las medidas
    (Poster 95 S.L., 2023-06-14) Jimenez Salas, Manuel; Melendez Useros, Miguel; Viadero Monasterio, Fernando; López Boada, María Jesús; López Boada, Beatriz; Ministerio de Ciencia e Innovación (España)
    El desarrollo de vehículos con gran nivel de automatización presenta diversos desafíos técnicos, como son el diseño de controladores robustos que sean capaces de hacer frente a perturbaciones externas que afectan a la dinámica del vehículo, así como lograr un comportamiento estable en presencia de retrasos en la red de comunicación.
  • Publication
    Optimal off-grid photovoltaic production in developing countries during critical months by using optimum tilt
    (IEEE, 2023-08-03) Chinchilla Sánchez, Mónica; Sanmartín Gaona, José Luis; Martínez Crespo, Jorge; Ruiz-Rivas Hernando, Ulpiano
    The study focuses on determining the optimal monthly inclination angle of the photovoltaic panels with the aim of maximizing the solar irradiance captured each month of the year. This data, together with the knowledge of the necessary monthly electricity consumption, will help to optimally select the generator power or make a correct location of the panels. The use of off-grid photovoltaic systems in latitudes between ±37° is increasingly used as the main method of electricity supply in many developing countries. The aim is to find simple equations to relate the monthly optimal inclination of the solar panels and latitude in the mentioned range of latitudes. These equations can be very useful when irradiance data and advanced computer tools are not available to provide the monthly optimal inclination in that site. By optimizing the solar capture in the critical month and designing the system to guarantee the electricity demand that month, there will be enough photovoltaic production in the rest of the months.
  • Publication
    Diseño de una herramienta para la gestión de un servicio de transporte de emergencias utilizando las APIs de Google Maps
    (Poster 95 S.L., 2023-06-14) López Boada, María Jesús; García Guzmán, Javier; García-Pozuelo Ramos, Daniel; Armingol Moreno, José María; Sanchis de Miguel, María Araceli; Amarís Duarte, Hortensia Elena; Molina López, José Manuel; Losada Maestre, Roberto; Nieto Sánchez, María Jesús; Pedraza Córdoba, Juanita del Pilar; López Boada, Beatriz; Comunidad de Madrid; Universidad Carlos III de Madrid
    Durante la pandemia causada por el virus SARS-CoV-2, los servicios de emergencia (SEMs) experimentaron un incremento sin precedentes de peticiones de sus servicios en la mayoría de los países del mundo y con más pacientes en estado crítico que en eventos catastróficos anteriormente ocurridos. Esta situación fue especialmente crítica en el sistema de ambulancias donde se observó un deterioro importante de sus tiempos de respuesta no solo en relación a enfermos de COVID-19 sino también a pacientes que presentaban otras patologías.
  • Publication
    Exascale programing models for extreme data processing
    (IEEE, 2023-05-09) García Blas, Francisco Javier; Carretero Pérez, Jesús; European Commission
    Extreme Data is an incarnation of Big Data concept distinguished by the massive amounts of data that must be queried, communicated and analysed in (near) real-time by using a very large number of memory/storage elements and Exascale computing systems. Immediate examples are the scientific data produced at a rate of hundreds of gigabits-per-second that must be stored, filtered and analysed, the millions of images per day that must be mined/analyzed in parallel, the one billion of social data posts queried in real-time on an in-memory components database. Traditional disks or commercial storage cannot handle nowadays the extreme scale of such application data. Following the need of improvement of current concepts and technologies, ASPIDE's activities focus on data-intensive applications running on systems composed of up to millions of computing elements (Exascale systems). Practical results will include the methodology and software prototypes that will be designed and used to implement Exascale applications. The ASPIDE project contributed with the definition of a new programming paradigms, APIs, runtime tools and methodologies for expressing data-intensive tasks on Exascale systems, which can pave the way for the exploitation of massive parallelism over a simplified model of the system architecture, promoting high performance and efficiency, and offering powerful operations and mechanisms for processing extreme data sources at high speed and/or real-time. This work is continued now in the ADMIRE EuroHPC project.
  • Publication
    Affect display recognition through tactile and visual stimuli in a social robot
    (Springer Nature Switzerland Ag, 2022-12-13) Marqués Villarroya, Sara; Gamboa Montero, Juan José; Jumela Yedra, Cristina; Castillo Montoya, José Carlos; Salichs Sánchez-Caballero, Miguel; Comunidad de Madrid; European Commission; Ministerio de Ciencia e Innovación (España)
    New technologies are nowadays an important part of human communication and interaction. While text, facial, and voice recognition have become increasingly fluid in recent years, thanks to the development of machine learning algorithms, recognising and expressing sensations or moods via multimodal recognition is a field that the literature could further explore. This situation introduces a new challenge to social robots. In this work, the authors study how a combination of visual and tactile stimuli influences people’s perceptions of affect display and seeks to apply these findings to a social robot. In the experiments, the subjects had to determine the perceived valence and arousal of simultaneously being exposed to the two stimuli mentioned above. The analysis revealed that the combination of touch and facial expression significantly influences the valence and arousal perceived by users. Based on these findings, this work includes an application for the robot to determine the user’s affect display in real-time.
  • Publication
    Do women in family businesses enhance non-financial performance. A FSQCA approach
    (Gender, Work & Organization Conference, 2023-06-28) Paz Aparicio, Carmen; Elvira, Marta; Rodríguez García, María
    From prior research we know that the role of women in family firms is often described by using terms such as invisible or hidden are often used to describe. Women face obstacles to move up the organization and experience gender inequality when they reach top management positions. Yet a complication comes about because important research questions remain unanswered about gender diversity in family business which have the potential of influencing the practice of management and diminishing inequality in this large sector of the economy. This complication is of concern because women are still underrepresented in top leadership roles, and it becomes crucial to understand and foster the role of women in family firms, as they constitute the vast majority of companies worldwide. The course of action to address this concern entails synthesizing and integrating the theories strategic nepotism, role congruity theory and socioemotional wealth and literature on gender to family business. This paper contributes to the literature by providing new conceptual insights and fresh evidence for the potential link between three significant phenomena in family business research: the presence of women in leadership positions, and the benefits of pro-organizational behavior in family firms, such as non-financial performance.
  • Publication
    Transformation of defects into fatigue cracks; the role of Kt and defect scale on fatigue life of non-pristine components
    (Elsevier, 2010-03-15) Cini, Andrea; Irving, P.E.
    Fatigue lives of 2 mm aluminium 2024-T351 sheet samples were measured. The samples contained introduced surface scratches between 50 μm and 180 μm deep, with root radii of 5, 25 and 50 μm. Fatigue cracks initiated from the scratches, final failure cracks being about 1 mm in length. Thus the entire crack growth process took place in the short crack regime. Fatigue crack growth rates in the sheet through thickness direction were measured using striation spacing measurements, allowing the calculation of crack growth lives as a fraction of total sample life. All scratches reduced the fatigue life compared with those of pristine samples. Whilst Kt was an important parameter determining extent of life reduction, notch root radius was equally important. Stress fields at the scratch root were studied using elastic-plastic finite element models. Life data and models were used to develop a unified approach for prediction of life of non-pristine components, incorporating effects of defect geometry. k growth rates in the sheet through thickness direction were measured using striation spacing measurements, allowing the calculation of crack growth lives as a fraction of total sample life. All scratches reduced the fatigue life compared with those of pristine samples. Whilst Kt was an important parameter determining extent of life reduction, notch root radius was equally important. Stress fields at the scratch root were studied using elastic-plastic finite element models. Life data and models were used to develop a unified approach for prediction of life of non-pristine components, incorporating effects of defect geometry
  • Publication
    Ritches. Turismo responsable del patrimonio cultural
    (Centro de Iniciativas Culturales y Sociales, CICEES, 2020) Robertson, Margaret Hart; Povedano Marrugat, Elisa María
    El proyecto de Re-rooting RITCHES (el acrónimo del nombre en inglés, Responsible Community Tourism Re-Interpretations of Cultural Heritage for Evolving Sustainability) presentado ante la UE bajo la iniciativa del JPICH y donde participa la Universidad de Carlos III desde su Master en Gestión Turística de los Recursos Culturales y Naturales junto a las Universidades de East London (UK) y Aveiro (Portugal) plantea trabajar un nuevo concepto inter-generacional e inter-disciplinario de la RSC para regenerar la gestión e interpretación turística del patrimonio cultural responsablemente en beneficio de toda la comunidad. Se plantea en un momento en el que el patrimonio cultural urbano y la calidad de vida residencial están amenazados por el sobre-turismo de consumo rápido y banal de lugares patrimoniales y cuando el cambio climático y el abandono del campo para la ciudad ponen en peligro a las raíces intangibles de muchas culturas europeas. De la misma manera que el cambio climático requiere una socialización del problema y sus posibles soluciones (a nivel individual y comunitario) a través de la economía circular, el patrimonio cultural requiere una re-contextualización re-creativa para mejorar las cadenas de valor turísticas y regenerar vida en los áreas rurales. RITCHES plantea un amplio programa de socialización y “edutainment” (re-creo) que implica, sobre todo a las primeras y terceras generaciones y, a través de ellos y de la RSC empresarial lato sensu, a la generación en medio, para que defiendan como comunidad el sentido del lugar y la cultura diferenciada de manera responsable y verdaderamente sostenible.
  • Publication
    La palabra como textura en la arquitectura india: des-cripciones de Octavio Paz y Henri Michaux
    (Universidad De Burgos, 2018-06-19) Romero González, Aránzazu; Román Aliste, Sergio
    Este texto revisa el modo en que se ha descrito el valor escritural de la textura de la arquitectura india a partir de textos poéticos y ensayísticos de Octavio Paz y Henri Michaux. La mirada historiográfica tradicional ha desarrollado interpretaciones excesivamente técnicas y "evidentes" sobre la cuestión, y esta propuesta toma los textos de Michaux y Paz como fuente y exponentes de una mirada capaz de captar la textura desde premisas renovadas y pertinentes para posteriores estudios.
  • Publication
    Automation system for setpoint temperatures based on adaptive comfort: an in-depth guide of ACCIS capabilities running with EnergyPlus
    (Ecohouse Initiative Ltd., 2022-09-05) García Sánchez, José Daniel; Martínez Crespo, Jorge; Ruiz-Rivas Hernando, Ulpiano; Alonso, Carmen
    The possibility for energy savings from implementing setpoint temperatures based on adaptive comfort has recently been investigated. This can be achieved by using the recently proposed Adaptive-ComfortControl-Implementation Script (ACCIS), that is a computational approach which extends the air-conditioning usage to adaptive comfort. According to both an Input Data File (IDF) and the setup supplied by the user, ACCIS turns PMV-based into adaptive setpoint building EnergyPlus models. Originally, ACCIS was an EnergyManagementSystem (EMS) script, but its capabilities have been expanded, and it has been nested in the Adaptive Comfort Control Implemented Model ("accim") Python package. This study focuses on the development of ACCIS, and provides a deeper view of the operation of the computational approach based on the relationship between the objects that compose it. As a result, ACCIS brings up new possibilities for conducting energy simulations on a global scale rather than merely on a national or continental size, since all weather file quantity limits have been tackled and now studies can be developed based on millions of simulations. Also, ACCIS could be applied to energy management, or coupled with artificial intelligence to develop smart thermostats.
  • Publication
    Two-step optimization algorithm for energy management and active-reactive power commands for real-time operation of hybrid microgrids
    (European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2023-05-24) Gonzalez De Armas, Marcial; Arnaltes Gómez, Santiago; Arredondo Rodríguez, Francisco; Rodríguez Amenedo, José Luis; Comunidad de Madrid
    This paper proposes a two-step optimization algorithm for energy management and optimal control of activereactive power commands in microgrids. The first step ensures an optimal energy management and provides the active power setpoints for power plants and energy storage. The second step calculates the voltage setpoints for power plants and reactive power flows whilst minimizing power transmission losses. This work focuses on the second step of the algorithm and the framework to combine both. A previous study introduces the first step based on a receding-horizon scheme. It is analysed and discussed the performance of the algorithm against two decentralized methods widely used in the literature. The results show that the proposed algorithm reduces power transmission losses by more than 20% compared to other methods.
  • Publication
    On the bending collapse behavior of rectangular hollow steel shapes of various thicknesses
    (ilmedia, 2023-09-04) Lavayen Farfán, Daniel; Yarasca Huanacune, Jorge; Butenegro García, José Antonio; López Boada, María Jesús; Rodríguez Hernández, Jorge Antonio
    Rectangular hollow steel shapes are widely used in numerous engineering areas due to their availability and price. In large vehicles, such as buses, these shapes also contribute to the overall crashworthiness of the vehicle, as they absorb most of the kinetic energy of an impact, and dissipate it as localized plastic deformation during a process known as bending collapse. Since a correct calculation of the crashworthiness of a structure is vital to ensure the safety of the occupants of a vehicle, special care must be taken to address the bending collapse behavior, as it is a major energy absorption mechanism. This research aims to investigate the effects and influence of thickness of the hollow shape on the bending collapse characteristics, and thus on the crashworthiness of a vehicle. Furthermore, regulations regarding crashworthiness often require some sort of experimental validation of the zones that undergo bending collapse. However, since there is no standardized test for bending collapse, the results from two types of experimental setups are compared, to study the influence of the setup on the bending collapse behavior. The results provide a detailed understanding of the failure modes of these shapes under bending loads. Additionally, the research provides insights into the design and optimization of rectangular hollow steel shapes, which will be useful to engineers and designers in the selection of thicknesses that are most appropriate for specific applications.
  • Publication
    Characterization and improvement of axial and radial stiffness of contactless thrust superconducting magnetic bearings
    (Springer Us, 2013-09-08) Valiente Blanco, Ignacio; Díez Jiménez, Efrén; Cristache, Cristian; Álvarez Valenzuela, Marco Antonio; Pérez Díaz, José Luis; European Commission
    Contactless bearings based on both permanent magnets and superconducting magnetic levitation are interesting to avoid all the tribological problems associated with contact at very low temperature. Superconducting magnetic bearings (SMBs) find application in mechanical engineering where lack of contact is a requirement or an advantage. In comparison with active magnetic bearings (AMBs), SMBs solve their inherent instability and require less complex control strategies and electronics. However, one of the current limitations is their low mechanical stiffness. Force densities are considerably lower in SMB than the state-of-art values for AMB. This fact certainly limits their applications. In this chapter, we summarize some key strategies for the improvement of radial and axial stiffness among with a description of some SMB in terms of load capability or force relaxation and discuss their advantages and disadvantages. A set of rules for the mechanical design of high-stiffness thrust superconducting magnetic bearings are proposed and experimentally demonstrated.
  • Publication
    Ku-Band Dual-Mode filter designed in Microstrip Gap Waveguide Technology
    (IEEE, 2021-03-22) Inclán Sánchez, Luis Fernando de; Ministerio de Economía y Competitividad (España)
    A new version of a dual-mode filter based on microstrip gap waveguide technology is proposed in this paper. The analyzed filter consists of a square ring with a perturbation that produces the coupling of two degenerate modes. In this new configuration, the effect that some of the main parameters have on the filter's bandpass response is studied. This work shows by means of some examples the possibility of designing filters of reduced size in inverted microstrip gap waveguide technology. Two filters have beenimplemented in the Ku band with a 3 dB fractional bandwidth of 9.3% and 8.6%. The minimum simulated insertion losses for the filters have been 0.4 dB and 0.5 dB respectively. This novel proposal presents an inherent packaging capability and also allows the implementation of bandpass filters with very low losses and increased selectivity.
  • Publication
    On Coded Caching for Two Users with Overlapping Demand Sets
    (IEEE.The Institute of Electrical And Electronics Engineers, Inc, 2020-06-07) Chang, Chih-Hua; Wang, Chih-Chun; Peleato Iñarrea, Borja Manuel
    Coded caching is a technique for reducing congestion in communication networks by prefetching content during idle periods and exploiting multicasting opportunities during periods of heavy traffic. Most of the existing research in this area has focused on minimizing the worst case (i.e., peak) rate in a broadcast link with multiple identically distributed user requests. However, modern content delivery networks are investing very heavily in profiling their users and predicting their preferences. The minimal achievable rate of a coded caching scheme with heterogeneous user profiles is still unknown in general. This paper presents the first steps towards solving that problem by analyzing the case of two users with distinct but overlapping demand sets. Specifically, it provides a complete characterization of the uniform-average-rate capacity when the sets overlap in just one file and shows that such capacity can be achieved with selfish and uncoded prefetching. Then, it characterizes the same capacity under selfish and uncoded prefetching when the demand sets overlap in two or more files. The paper also provides explicit prefetching schemes that achieve those capacities. All our results allow for arbitrary (and not necessarily identical) users' cache sizes and number of files in each demand set.
  • Publication
    PAC-Bayes bounds for stable algorithms with instance-dependent priors
    (2018-12-02) Rivaplasta, Omar; Parrado Hernández, Emilio; Shawe Taylor, John; Sun, Shiliang; Szepesvari, Csaba
    PAC-Bayes bounds have been proposed to get risk estimates based on a training sample. In this paper the PAC-Bayes approach is combined with stability of the hypothesis learned by a Hilbert space valued algorithm. The PAC-Bayes setting is used with a Gaussian prior centered at the expected output. Thus a novelty of our paper is using priors defined in terms of the data-generating distribution. Our main result estimates the risk of the randomized algorithm in terms of the hypothesis stability coefficients. We also provide a new bound for the SVM classifier, which is compared to other known bounds experimentally. Ours appears to be the first uniform hypothesis stability-based bound that evaluates to non-trivial values.