Estudio del estándar 802.15.7 del IEEE sobre sistemas de comunicación por luz visible

En la actualidad el sector de las Telecomunicaciones es uno de los más importantes y que mayor impacto tiene en la vida cotidiana de las personas. Cada vez aparecen nuevos sistemas de comunicaciones y aplicaciones asociadas que buscan mejorar la vida de la población. En este trabajo se explica el estándar IEEE 802.15.7 que trata sobre comunicaciones por luz visible, una tecnología en desarrollo que posibilitará la aparición de nuevas y variadas aplicaciones tomando como base la luz visible. La importancia de este tipo de comunicaciones radica en dos puntos: uso de una parte del espectro que no se había utilizado antes para comunicaciones inalámbricas y mejor aprovechamiento de aplicaciones de luz que habían sido utilizadas tradicionalmente. El primer punto surge de la saturación que presenta el espectro en la banda de radiofrecuencia, con el tiempo se desarrollan mayor número de aplicaciones con necesidad de un gran ancho de banda. Y por otro lado se aprovecha la funcionalidad de iluminación para también proporcionar comunicación, por lo que se ahorrara en energía y en costes de implementación. En este documento se explicará la estructura de un sistema VLC, se proporcionarán detalles sobre los protocolos que rigen su funcionamiento, la arquitectura que presenta, métodos de conexión de dispositivos y las restricciones que presentan. También se especificarán los servicios que ofrecen cada una de las capas que compone la arquitectura así como las especificaciones de seguridad de cada una de ellas y de esta forma tener una idea completa de estos sistemas.Nowadays, Telecommunications is one of the most important sectors on the daily lives of people. New communication systems and applications are appearing every time that help people to improve their lives. IEEE standard 802.15.7 about visible light communications is explained in this document, a new developing technology that will enable the implementation of new and varied applications using the visible light. The importance of this type of communications lies in two points: the use of a portion of the spectrum that had not been used before to wireless communications and the use of traditionally lighting applications. The first point arises from the radiofrequency spectrum saturation due to these frequencies are used by many applications and large bandwidth is needed. On the other hand, the functionality of lighting is mixed with information communications, so it will save energy an implementation costs. This document will describe the structure of a VLC system, it will provide details of protocols to use them, its architecture, device connection methods and constraints. Services offered by each of the layers and their security specifications will be also specified.Universidad de Sevilla. Grado en Ingeniería de las Tecnologías de Telecomunicació

Sostenibilización curricular en las universidades españolas. ¿Ha llegado la hora de actuar?

[ES]Desde la Educación Superior se contempla la necesidad de incluir contenidos ambientales (económicos-sociales-naturales) en los curricula de las diferentes titulaciones para formar profesionales capaces de actuar críticamente en pos de la sostenibilidad. La CRUE viene trabajando en este sentido desde 2002, en 2005 aprobó unas directrices para la sostenibilización curricular en las universidades españolas. En la actualidad, desde la Comisión Sectorial para la Calidad Ambiental el Desarrollo Sostenible y la Prevención de Riesgos (CADEP) de la CRUE, se han detectado dificultades para su implantación y se trabaja en el estudio de estrategias para su mejor aplicación

ControlPULP: A RISC-V On-Chip Parallel Power Controller for Many-Core HPC Processors with FPGA-Based Hardware-In-The-Loop Power and Thermal Emulation

High-Performance Computing (HPC) processors are nowadays integrated Cyber-Physical Systems demanding complex and high-bandwidth closed-loop power and thermal control strategies. To efficiently satisfy real-time multi-input multi-output (MIMO) optimal power requirements, high-end processors integrate an on-die power controller system (PCS). While traditional PCSs are based on a simple microcontroller (MCU)-class core, more scalable and flexible PCS architectures are required to support advanced MIMO control algorithms for managing the ever-increasing number of cores, power states, and process, voltage, and temperature variability. This paper presents ControlPULP, an open-source, HW/SW RISC-V parallel PCS platform consisting of a single-core MCU with fast interrupt handling coupled with a scalable multi-core programmable cluster accelerator and a specialized DMA engine for the parallel acceleration of real-time power management policies. ControlPULP relies on FreeRTOS to schedule a reactive power control firmware (PCF) application layer. We demonstrate ControlPULP in a power management use-case targeting a next-generation 72-core HPC processor. We first show that the multi-core cluster accelerates the PCF, achieving 4.9x speedup compared to single-core execution, enabling more advanced power management algorithms within the control hyper-period at a shallow area overhead, about 0.1% the area of a modern HPC CPU die. We then assess the PCS and PCF by designing an FPGA-based, closed-loop emulation framework that leverages the heterogeneous SoCs paradigm, achieving DVFS tracking with a mean deviation within 3% the plant's thermal design power (TDP) against a software-equivalent model-in-the-loop approach. Finally, we show that the proposed PCF compares favorably with an industry-grade control algorithm under computational-intensive workloads.Comment: 33 pages, 11 figure

Research for TRAN Committee – European Tourism Labelling

This study focusses on the current situation in the European Union regarding quality and sustainability labelling in tourism. There is concern that the existing volume and variety of labels has become a barrier to consumer choice, which in consequence may lead to lost opportunities to increase the competitiveness of the European tourism industry. The study analyses the possibility of the introduction of an EU standard(s) for tourism services through the initiation of a harmonised EU certification system and the potential for the establishment of a single European tourism label

Reliability of spirometric tests during the different menstrual cycle phases in healthy women

Carta al Editor sobre la fiabilidad de las pruebas espirométricas durante las diferentes fases del ciclo menstrual en mujeres sanas.Letter to the Editor about "Reliability of Spirometric Tests during the Different Menstrual Cycle Phases in Healthy Women"peerReviewe

It's Not How Fat You Are, It's What You Do with It That Counts

Mechanisms underlying obesity-related metabolic disorders are poorly understood. Samuel Virtue and Antonio Vidal-Puig explore the evidence for an emerging hypothesis that attributes metabolic complications not to obesity per se, but to an individual's capacity for adipose tissue expandability

Creativitat digital

Descripció del recurs: 6 novembre 2023El segon volum de la col·lecció «Diàlegs UPCArts» ens introdueix en el món de la creativitat digital, amb la voluntat d’incorporar elements que facilitin l’establiment d’un diàleg humanístic envers alguns dels seus conceptes més vigents: les aplicacions artístiques i tècniques, àmbits d'actuació, components ètics i exploracions reflexives teòriques i experimentals en diferents camps creatius. Partim de les aportacions de referents en la matèria, que ens n'ofereixen diferents perspectives sobre la creativitat a l'era de la digitalització, tant des de l’òptica històrica, com la tècnica, l'artística i l’ètica. La necessitat d’establir marcs de col·laboració transdisciplinaris pren una rellevància cabdal per aprofundir en la comprensió del que amaga el concepte de creativitat digital i l'ús emergent de la intel·ligència artificial en aquest àmbit. Finalment, es mostren també tres experiències pràctiques vinculades al context universitari, on la intel·ligència artificial generativa ha penetrat ja de forma destacada, tant en el context acadèmic com pel desenvolupament d’altres iniciatives. Disposeu aquí, doncs, d’un nou diàleg UPCArts que vol promoure i posar de manifest la importància d’establir una comunicació humanística entre la tècnica i l'art, en relació amb la creativitat digital, en el marc universitari però obrint la universitat al món.

To which world regions does the valence–dominance model of social perception apply?

Over the past 10 years, Oosterhof and Todorov’s valence–dominance model has emerged as the most prominent account of how people evaluate faces on social dimensions. In this model, two dimensions (valence and dominance) underpin social judgements of faces. Because this model has primarily been developed and tested in Western regions, it is unclear whether these findings apply to other regions. We addressed this question by replicating Oosterhof and Todorov’s methodology across 11 world regions, 41 countries and 11,570 participants. When we used Oosterhof and Todorov’s original analysis strategy, the valence–dominance model generalized across regions. When we used an alternative methodology to allow for correlated dimensions, we observed much less generalization. Collectively, these results suggest that, while the valence–dominance model generalizes very well across regions when dimensions are forced to be orthogonal, regional differences are revealed when we use different extraction methods and correlate and rotate the dimension reduction solution

A multi-country test of brief reappraisal interventions on emotions during the COVID-19 pandemic.

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about a situation. Participants from 87 countries and regions (n = 21,644) were randomly assigned to one of two brief reappraisal interventions (reconstrual or repurposing) or one of two control conditions (active or passive). Results revealed that both reappraisal interventions (vesus both control conditions) consistently reduced negative emotions and increased positive emotions across different measures. Reconstrual and repurposing interventions had similar effects. Importantly, planned exploratory analyses indicated that reappraisal interventions did not reduce intentions to practice preventive health behaviours. The findings demonstrate the viability of creating scalable, low-cost interventions for use around the world