Fundamentos de los timers de los microcontroladores STM32F4

En este artículo se introducen los fundamentos de funcionamiento de los timers de la familia STM32F4 de microcontroladores ARM Cortex. Se enumeran los diferentes componentes y modos de funcionamiento y se explica, paso a paso, cómo utilizar las librerías CMSIS para configurarlos. Se suponen conocimientos básicos del sistema de relojes de esta familia de microcontroladores y de la utilización de las librerías CMSIS.Yuste Pérez, P. (2014). Fundamentos de los timers de los microcontroladores STM32F4. http://hdl.handle.net/10251/3953

Configuración de la frecuencia de trabajo de un microcontrolador STM32F4

En este artículo se introduce el sistema de relojes de la familia STM32F4 de los microcontroladores ARM Cortex. Se enumeran las fuentes de reloj que se pueden utilizar para generar el reloj del sistema y se explica, paso a paso, cómo hacer la configuración más habitual para conseguir la frecuencia deseada.Yuste Pérez, P. (2014). Configuración de la frecuencia de trabajo de un microcontrolador STM32F4. http://hdl.handle.net/10251/3953

Medición de tiempos con la familia de microcontroladores STM32

Utilización de los timers de microcontroladores STM32 en modo captura para medición de tiemposYuste Pérez, P. (2016). Medición de tiempos con la familia de microcontroladores STM32. http://hdl.handle.net/10251/68294DE

La WIKI en el Aprendizaje de los Estudiantes Universitarios de Ingenierías

[EN] This paper presents an innovation research on promoting self-learning and collaborative writing in engineering university courses. The work is focused on the development of a course Wiki as the leitmotiv of the students activity. Students produce self-contained and reusable Wiki pages within the course framework attending to a suitable work planning. Additionally to help the student on the achievement of curricula, the Wiki is also available to the whole group in the form of self-study material adapted to the students group. Wikis provide teachers with potentially significant opportunities for creating socially engaged tasks that require active student participation and collaboration. Wikis allow students to carry out a collaborative writing stimulating reflection, knowledge sharing, and critical thinking. However, despite the potential capabilities of wikis, there is a need for a systematic process to the construction of this virtual writing space and the use of this tool for upper expectations in a deep real learning approach. The paper also reports on the evaluation of the approach by means of quantitative data collection.Blanc Clavero, S.; Yuste Pérez, P. (2014). La WIKI en el Aprendizaje de los Estudiantes Universitarios de Ingenierías. En Strategies for education in a new context: INNODOCT'14 : International Conference on Innovation, Documentation and Teaching Technologies, held on-line in Valencia, Spain, on 8-9 May, 2014. https://riunet.upv.es/handle/10251/40350. Editorial Universitat Politècnica de València. 791-802. http://hdl.handle.net/10251/82186S79180

Automatic deployment of an RPAS Mission Manager to an ARINC-653 compliant system

[EN] The development process of avionics system requiring a high level of safety is subjected to rigorous development and verification standards. In order to accelerate and facilitate this process, we present a testbed that uses a suite of methods and tools to comply with aerospace standards for certification. To illustrate the proposed methodology, we designed a Mission Management System for Remotely Piloted Aircraft Systems (RPAS) that was deployed on a particular run-time execution platform called XtratuM, an ARINC-653 compliant system developed in our research group. The paper discusses the system requirements, the software architecture, the key issues for porting designs to XtratuM, and how to automatize this process. Results show that the proposed testbed is a good platform for designing and qualifying avionics applications.This research has been financed by the Institute of Control Systems and Industrial Computing (Ai2), and by projects GVA AICO/2015/126 (Ayudas para Grupos de Investigacion Consolidables) and GVA ACIF/2016/197 (Ayudas para la contratacion de personal investigador en formacion de caracter predoctoral) of the Spanish Regional Government "Generalitat Valenciana".Usach Molina, H.; Vila Carbó, JA.; Crespo, A.; Yuste Pérez, P. (2018). Automatic deployment of an RPAS Mission Manager to an ARINC-653 compliant system. Journal of Intelligent & Robotic Systems. 92(3-4):587-598. https://doi.org/10.1007/s10846-017-0694-3S587598923-4Aeronautical Radio, Inc.: ARINC specification 653-1. Avionics Application Software Standard Interface (2003)Bonasso, R., Kerri, R., Jenks, K., Johnson, G.: Using the 3T architecture for tracking Shuttle RMS procedures. In: Proceedings of the IEEE International Joint Symposia on Intelligence and Systems. IEEE, Rockville, MD, USA (1998) https://doi.org/10.1109/IJSIS.1998.685440fentISS: XtratuM Hypervisor Emulator (SKE) start guide. Tech. rep., Universidad Politècnica de València (2015)Fons, B.: Plataforma para diseño y ejecución de aplicaciones de aviónica. Universitat Politècnica de València, Master’s thesis (2013)International Civil Aviation Organization: Doc. 9613 AN/937: Performance-based Navigation (PBN) Manual, 4th edn. (2013)International Civil Aviation Organization: Doc. 10019, AN/507: Manual on Remotely Piloted Aircraft Systems (RPAS), 1st edn. (2015)Koehl, D.: SESAR initiatives for RPAS integration. In: ICAO Remotely Piloted Aircraft Systems Symposium. Montreal, Canada (2015)Masmano, M., Ripoll, I., Crespo, A., Metge, J.: XtratuM: A hypervisor for safety critical embedded systems. In: Proceedings of the 11th Real-Time Linux Workshop. Dresden, Germany (2009)Masmano, M., Valiente, Y., Balbastre, P., Ripoll, I., Crespo, A., Metge, J.: LithOS: A ARINC-653 guest operating for XtratuM. In: Proceedings of the 12th Real-Time Linux Workshop. Nairobi, Kenia (2010)McCarley, J.S., Wickens, C.D.: Human factors implications of UAVs in the national airspace. Tech. Rep. AHFD-05-05/FAA-05-01, University of Illinois, Institute of Aviation, Aviation Human Factors Division (2005)North Atlantic Treaty Organization: STANAG 4703: Light Unmanned Aircraft Systems Airworthiness Requirements. NATO Standarization Agency (2014)Radio Technical Commission for Aeronautics (RTCA): DO-178C/ED-12C Software Considerations in Airborne Systems and Equipment Certification. RTCA (2011)Ribeiro, L.R., Oliveira, N.M.R.: UAV autopilot controllers test platform using Matlab/Simulink and X-Plane. In: 40th ASEE/ IEEE Frontiers in Education Conference. IEEE, Washington, DC, USA (2010). https://doi.org/10.1109/FIE.2010.5673378Spitzer, C.R.: Digital Avionics Handbook: Elements, Software and Functions, 2nd edn. CRC Press (2006)The MathWorks Inc.: Simulink Coder Target Language Compiler (2012)Usach, H.: Integridad y tolerancia a fallos en sistemas de aviónica. Universitat Politècnica de València, Master’s thesis (2014)Usach, H., Fons, B., Vila, J., Crespo, A.: An autopilot testbed for IMA (Integrated Modular Avionics) architectures. In: Proceedings of the 19th IFAC Symposium on Automatic Control in Aerospace. Elsevier, Würzburg, Germany (2013). https://doi.org/10.3182/20130902-5-DE-2040.00076Usach, H., Vila, J., Crespo, A., Yuste, P.: A highly-automated RPAS Mission Manager for integrated airspace. In: Proceedings of the 5th International Conference on Application and Theory of Automation in Command and Control Systems, ATACCS’15. ACM, Toulouse, France (2015). https://doi.org/10.1145/2899361.289936

An Acoustic Modem Featuring a Multi-Receiver and Ultra-Low Power

[EN] Wireless technology for underwater communication possesses a wide range of potential application, but it is still a relatively unexplored area in many aspects concerning modems physical design. A step towards future deployment of underwater networks is the reduction of power consumption. Therefore, asynchronous wakeup systems need to be integrated within the physical layer design while avoiding the use of additional transducers. This paper offers a practical and generic solution to adapt data reception and transmission together with asynchronous wakeup sub-systems in acoustic underwater modem architectures using a low power and low cost solution. The proposal has been implemented in a real prototype with success.The translation of this paper was funded by the Universitat Politècnica de València, Spain.The authors gratefully acknowledge financial support from the CICYT. ANDREA: Automated Inspection and Remote Performance of Marine Fish Farms (CTM2011-29691-C02-01) and RIDeWAN: Research on Improvement of the Dependability of WSN-based Applications by Developing a Hybrid Monitoring Platform. (TIN2011-28435-C03-01).Sánchez Matías, AM.; Blanc Clavero, S.; Yuste Pérez, P.; Perles Ivars, A.; Serrano Martín, JJ. (2015). An Acoustic Modem Featuring a Multi-Receiver and Ultra-Low Power. Circuits and Systems. 6(1):1-12. https://doi.org/10.4236/cs.2015.61001S1126

Navegación Basada en Prestaciones: Aprendizaje Basado en Proyectos para estudiantes de Aeronavegación

[EN] In aerospace engineering, motivation is considered a critical factor in the teaching-learning process, especially due to the difficulty of the subjects taught. Active methodologies, focused on student learning, can increase students' motivation and enhance their learning, helping them to persevere through a challenging workload. Previous studies have shown how the implementation of the Project-Based Learning methodology as a working tool in various disciplines is motivating and facilitates the integration of subjects and their permanence in student learning. In this work, the planning and development of this methodology in various subjects of Air Navigation Specific Technology is exposed, integrating the tasks that must be carried out in the different subjects, in lines of action with a common purpose: the development of the project of an airport according to its infrastructures and associated procedures.[ES] En la ingeniería aeroespacial la motivación se considera un factor crítico en el proceso de enseñanza-aprendizaje, sobre todo por la dificultad de las materias impartidas. Las metodologías activas, centradas en el aprendizaje del estudiante, pueden aumentar la motivación de los estudiantes y mejorar su aprendizaje, ayudándoles a perseverar a través de una carga de trabajo desafiante. Estudios previos han demostrado cómo la implantación de la metodología de Aprendizaje Basado en Proyectos como herramienta de trabajo en disciplinas varias, es motivadora y facilita la integración de las materias y su perduración en el aprendizaje del alumnado. En este trabajo se expone la planificación y el desarrollo de esta metodología en varias asignaturas de la Tecnología Específica de Aeronavegación, integrando las tareas que se deben llevar a cabo en las distintas asignaturas, en líneas de acción con un fin común: la elaboración del proyecto de un aeropuerto atendiendo a sus infraestructuras y procedimientos asociados.Este trabajo está enmarcado en el Proyecto de Innovación y Mejora Educativa PIME/19-20/196 con título: ''Navegación Basada en Prestaciones (Performance Based Navigation)'', del Vicerrectorado de Estudios, Calidad y Acreditación de la Universitat Politècnica de València, siendo esta la entidad financiadora (UPV: Convocatoria Aprendizaje + Docencia. Proyectos de Innovación y Mejora Educativa)Cuenca Gotor, VP.; Yuste Pérez, P.; Vila Carbó, JA.; Despujol Zabala, I.; Monsoriu Serra, JA. (2021). Navegación Basada en Prestaciones: Aprendizaje Basado en Proyectos para estudiantes de Aeronavegación. En IN-RED 2021: VII Congreso de Innovación Edicativa y Docencia en Red. Editorial Universitat Politècnica de València. 620-632. https://doi.org/10.4995/INRED2021.2021.13799OCS62063

Advanced Acoustic Wake-Up System for Underwater Sensor Networks

[EN] This paper presents a low-cost and low-power consumption asynchronous Wake-Up (WU) development to Underwater Wireless Sensor Networks (UWSN). An asynchronous WU offers important advantages for energyaware network polices, however it needs some specific hardware, an optimal configuration of system facilities and the interconnection with a core control unit. This proposed WU implementation has been specifically designed to be used in acoustic underwater modems, able to react to external acoustic stimuli. Both the modem and the Wake-Up system use a unique piezoelectric transducer dissipating, to our knowledge, the lowest power published until now. Moreover, the system is able to detect both simple tones and predefined bit patterns, being able to wake up a network node UWSN individually or even to different nodes at the same time.This work was supported in part by the Spanish Government: Project funds of SABINA CTM2011-29691-C02-01 (SENSORIZACIÓN AMBIENTAL SUBACUÁTICA PARA LA INSPECCIÓN Y MONITORIZACIÓN DE EXPLOTACIONES DE ACUICULTURA MARIAN) AND RIDEWAN TIN2011-28435-C03-01 (INVESTIGACIÓN EN LA MEJORA DE LA CONFIABILIDAD DE APLICACIONES BASADAS EN WSN MEDIANTE EL DESARROLLO DE UNA PLATAFORMA HIBRIDA DE MONITORIZACIÓN)Sánchez Matías, AM.; Blanc Clavero, S.; Yuste Pérez, P.; Piqueras Gozalbes, IR.; Serrano Martín, JJ. (2012). Advanced Acoustic Wake-Up System for Underwater Sensor Networks. Communications in information science and management engineering. 2(2):1-10. http://hdl.handle.net/10251/36744S1102

Chronodisruption and Ambulatory Circadian Monitoring in Cancer Patients: Beyond the Body Clock

Purpose of Review: Circadian rhythms impose daily rhythms a remarkable variety of metabolic and physiological functions, such as cell proliferation, inflammation, and DNA damage response. Accumulating epidemiological and genetic evidence indicates that circadian rhythms’ disruption may be linked to cancer. The integration of circadian biology into cancer research may offer new options for increasing cancer treatment effectiveness and would encompass the prevention, diagnosis, and treatment of this disease. Recent Findings: In recent years, there has been a significant development and use of multi-modal sensors to monitor physical activity, sleep, and circadian rhythms, allowing, for the very first time, scaling accurate sleep monitoring to epidemiological research linking sleep patterns to disease, and wellness applications providing new potential applications. Summary: This review highlights the role of circadian clock in tumorigenesis, cancer hallmarks and introduces the state-of-the-art in sleep-monitoring technologies, discussing the eventual application of insights in clinical settings and cancer researchThis work was supported in part by CLARIFY project, within European Union’s Horizon 2020 Research and Innovation Programme under grant agreement No. 875160, Instituto de Fomento de la Región de Murcia (INFO) and the European Regional Development Fund (FEDER

Nasopharyngeal Colonization and Invasive Disease Are Enhanced by the Cell Wall Hydrolases LytB and LytC of Streptococcus pneumoniae

Background: Streptococcus pneumoniae is a common colonizer of the human nasopharynx and one of the major pathogens causing invasive disease worldwide. Dissection of the molecular pathways responsible for colonization, invasion, and evasion of the immune system will provide new targets for antimicrobial or vaccine therapies for this common pathogen. Methodology/Principal Findings: We have constructed mutants lacking the pneumococcal cell wall hydrolases (CWHs) LytB and LytC to investigate the role of these proteins in different phases of the pneumococcal pathogenesis. Our results show that LytB and LytC are involved in the attachment of S. pneumoniae to human nasopharyngeal cells both in vitro and in vivo. The interaction of both proteins with phagocytic cells demonstrated that LytB and LytC act in concert avoiding pneumococcal phagocytosis mediated by neutrophils and alveolar macrophages. Furthermore, C3b deposition was increased on the lytC mutant confirming that LytC is involved in complement evasion. As a result, the lytC mutant showed a reduced ability to successfully cause pneumococcal pneumonia and sepsis. Bacterial mutants lacking both LytB and LytC showed a dramatically impaired attachment to nasopharyngeal cells as well as a marked degree of attenuation in a mouse model of colonization. In addition, C3b deposition and phagocytosis was more efficient for the double lytB lytC mutant and its virulence was greatly impaired in both systemic and pulmonary models of infection. Conclusions/Significance: This study confirms that the CWHs LytB and LytC of S. pneumoniae are essential virulence factor