El póster científico como medio para desarrollar la competencia de comunicación

Es frecuente que los estudiantes universitarios acaben su titulación habiendo realizado numerosas presentaciones de trabajos en distintas asignaturas. Generalmente estas presentaciones se realizan a partir de una búsqueda y consulta bibliográfica en internet y en la biblioteca. Los estudiantes de grado pocas veces recurren a artículos científicos publicados en revistas por la dificultad inicial que entraña su lectura. Sólo suelen recurrir a ellos en el caso en que sea explícitamente propuesto por el profesor. Nuestra experiencia se enmarca en la asignatura optativa de Grafos, Modelos y Aplicaciones de 4º curso del Grado en Ingeniería Informática de la UPV. Al alumnado de esta asignatura les hemos propuesto, como parte de la evaluación (llegando hasta el 50% de la nota final), que elijan un artículo científico relacionado con una parte de los contenidos de la asignatura. Dichos artículos deben ser estudiados y presentados públicamente por los estudiantes al resto de sus compañeros. Para ello se les propone que elaboren un póster científico y una presentación usando el programa Prezi. Con esta actividad no sólo contribuimos al desarrollo de las competencias orales y escritas del alumnado, sino que para muchos de ellos esta actividad supone una iniciación a la investigación científica

Devaney chaos and distributional chaos in the solution of certain partial differential equations

The notion of distributional chaos has been recently added to the study of the linear dynamics of operators and C0-semigroups of operators. We will study this notion of chaos for some examples of C0-semigroups that are already known to be Devaney chaotic. © 2012 Xavier Barrachina and J. Alberto Conejero.This work is supported in part by MEC and FEDER, Project MTM2010-14909, by Generalitat Valenciana, Project GV/2010/091, and by Universitat Politecnica de Valencia, Project PAID-06-09-2932. X. Barrachina also wants to acknowledge the support of the Grant FPI-UPV 2009-04 from Programa de Ayudas de Investigacion y Desarrollo de la Universitat Politecnica de Valencia. The authors also thank the referees for helpful comments that improved the presentation of the paper.Barrachina Civera, X.; Conejero Casares, JA. (2012). Devaney chaos and distributional chaos in the solution of certain partial differential equations. Abstract and Applied Analysis. 2012:1-11. https://doi.org/10.1155/2012/457019S111201

[S]-linear and convex structures in function families

In this paper, the notion of [S]-lineability (originally coined by Vladimir I. Gurariy) is introduced and developed in a general abstract setting. This new notion is, then, applied to specific situations, as for instance, classes of differentiable nowhere monotone functions as well as families of vectors having dense orbit with respect to an operator. Large convex structures are also shown to exist inside the family of topologically mixing continuous selfmaps of a real compact interval.Plan Andaluz de Investigación de la Junta de AndalucíaMinisterio de Economía y Competitividad (MINECO). EspañaGeneralitat Valencian

Detection of nonadjacent rotor faults in induction motors via spectral subtraction and autocorrelation of stray flux signals

(c) 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.[EN] In this paper, statistical signal processing techniques are applied to electromotive force signals captured in external coil sensors for adjacent and nonadjacent broken bars detection in induction motors. An algorithm based on spectral subtraction analysis is applied for broken bar identification, independent of the relative position of the bar breakages. Moreover, power spectrum analyses enable the discrimination between healthy and faulty conditions. The results obtained with experimental data prove that the proposed approach provides good results for fault detectability. Moreover, the identification of the faults, and the signal correlation indicator to prove the results are also presented for different positions of the flux sensor.This work was supported in part by MEC under Project MTM 2016-7963-P and in part by the Spanish 'Ministerio de Ciencia Innovacion y Universidades' and FEDER program in the framework of the 'Proyectos de I+D de Generacion de Conocimiento del Programa Estatal de Generacion de Conocimiento y Fortalecimiento Cientifico y Tecnologico del Sistema de I+D+i, Subprograma Estatal de Generacion de Conocimiento' (ref: PGC2018-095747-B-I00).Iglesias-Martínez, ME.; Fernández De Córdoba, P.; Antonino Daviu, JA.; Conejero, JA. (2019). Detection of nonadjacent rotor faults in induction motors via spectral subtraction and autocorrelation of stray flux signals. IEEE Transactions on Industry Applications. 55(5):4585-4594. https://doi.org/10.1109/TIA.2019.2917861S4585459455

Higher-order spectral analysis of stray flux signals for faults detection in induction motors

[EN] This work is a review of current trends in the stray flux signal processing techniques applied to the diagnosis of electrical machines. Initially, a review of the most commonly used standard methods is performed in the diagnosis of failures in induction machines and using stray flux; and then specifically it is treated and performed the algorithms based on statistical analysis using cumulants and polyspectra. In addition, the theoretical foundations of the analyzed algorithms and examples applications are shown from the practical point of view where the benefits that processing can have using HOSA and its relationship with stray flux signal analysis, are illustrated.This work has been supported by Generalitat Valenciana, Conselleria d'Educació, Cultura i Esport in the framework of the "Programa para la promoción de la investigación científica, el desarrollo tecnológico y la innovación en la Comunitat Valenciana", Subvenciones para grupos de investigación consolidables (ref: AICO/2019/224). J. Alberto Conejero is also partially supported by MEC Project MTM2016-75963-P.Iglesias Martínez, ME.; Antonino Daviu, JA.; Fernández De Córdoba, P.; Conejero, JA. (2020). Higher-order spectral analysis of stray flux signals for faults detection in induction motors. Applied Mathematics and Nonlinear Sciences. 5(2):1-14. https://doi.org/10.2478/amns.2020.1.00032S11452H. Akçay and E. Germen. 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Fpga-based broken bars detection on induction motors under different load using motor current signature analysis and mathematical morphology. IEEE Transactions on Instrumentation and Measurement, 63(5):1032–1040, 2013.P. A. Delgado-Arredondo, D. Morinigo-Sotelo, R. A. Osornio-Rios, J. G. Avina-Cervantes, H. Rostro-Gonzalez, and R. de Jesus Romero-Troncoso. Methodology for fault detection in induction motors via sound and vibration signals. Mechanical Systems and Signal Processing, 83:568–589, 2017.M. Drif and A. J. M. Cardoso. Stator fault diagnostics in squirrel cage three-phase induction motor drives using the instantaneous active and reactive power signature analyses. IEEE Transactions on Industrial Informatics, 10(2):1348–1360, 2014.L. Frosini, C. Harlişca, and L. Szabó. Induction machine bearing fault detection by means of statistical processing of the stray flux measurement. IEEE Transactions on Industrial Electronics, 62(3):1846–1854, 2014.Z. Gao, C. Cecati, and S. X. Ding. 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Acceptance of reservations for a rent-a-car company

Airlines schedules can been modeled by using time-space networks. One of the core problems of the management of rent-a-car companies is to automate the process of the acceptance of vehicles reservations from the clients. We propose a model to deal with this problem. Our solution is based on the admissibility of flows on these networks. The right choice of the edges of the network and which are their maximum and minimum constraints constitute the base of our work.Conejero Casares, JA.; Jordan Lluch, C.; Sanabria Codesal, E. (2012). Acceptance of reservations for a rent-a-car company. International Journal of Complex Systems in Science. 2(1):27-32. http://hdl.handle.net/10251/43956S27322

A tree-based model for setting optimal train fare zones

Given a railway line with n stops and the number of travelers between each pair of stops, we show how to split these stops into k different fare zones in order to maximize the benefit obtained from the sale of tickets to the travelers. We present a method to obtain this solution that is based on finding the longest path in a weighted root tree. This method improves in terms of efficiency the combinatorial method, where all the possible distributions have to be considered for deciding which is the optimal one.The authors would like to thank RENFE for his collaboration and providing us several tables of data of the flow of passengers of the commuter trains of the Valencia region. J. Alberto Conejero is supported by MEC Project MTM2013-47093-P and Esther Sanabria-Codesal is supported by MEC Project MTM2012-33073.Conejero Casares, JA.; Jordan Lluch, C.; Sanabria Codesal, E. (2014). A tree-based model for setting optimal train fare zones. Mathematical Problems in Engineering. 2014:1-11. https://doi.org/10.1155/2014/384321S111201

An iterative algorithm for the management of an electric car rental service

The management of a car-rental service becomes more complex as long as one-way bookings between different depots are accepted. These bookings can increase the operational costs due to the necessity of moving vehicles from one depot to another by the company staff in order to attend previously accepted bookings. We present an iterative model based on flows on networks for the acceptance of bookings by a car-rental service that permits one-way reservations. Our model lets us also recover the movement of the fleet of vehicles between the depots over the time. In addition, it also permits including restrictions on the amount of cars managed at every single depot. These results can be of interest for an electric car-rental service that operates at different depots within a city or region.J. Alberto Conejerois is supported by MEC Project MTM2013-47093-P. The authors thank Victor Fernandez and Raul Urbano from the Mobincity Project for their helpful discussions on the topic. Esther Sanabria-Codesal is supported by MEC Project MTM2012-33073.Conejero Casares, JA.; Jordan Lluch, C.; Sanabria Codesal, E. (2014). An iterative algorithm for the management of an electric car rental service. Journal of Applied Mathematics. 2014. https://doi.org/10.1155/2014/483734S201

La entrada en la Universidad: un reto para la orientación académica

[EN] Improve transition from secondary education to university has always been a challenge in academic guidance. Freshmen face a new personal, social, and academic context. Universities play a fundamental role in the insertion process of students coming from high school and vocational education into the university studies. During last years, a number of resources have been invested by the universities in order to develop actions that facilitate a wide range of information to prospective students. In this work we present the transition project of the Universitat Politècnica de València (UPV), focused in two moments: pre-university guidance and first year of college. The core goals of the project are to facilitate the transition of students to college, raising informational and practical actions about the studies offered by the university in order to help future students in their decisionmaking process, and to set different ways of support through tutoring that promote the adaptation to the university environment and the development of their students. The institutional project of transition from secondary education to college studies of the UPV is coordinated by the Communication Area and the Institute of Educational Sciences (ICE-UPV) of this university. This is an open project that permits adaptations attending to the necessities reported by the school counselors, prospective and university students, and tutors.[ES] La transición de los estudios de secundaria a la Universidad ha sido y es un reto para la orientación. El estudiante se enfrenta a un contexto nuevo, tanto en el ámbito personal como en los ámbitos social y académico. Las universidades tienen un papel relevante en todo el proceso de inserción de los estudiantes de bachillerato y de ciclos formativos en los estudios universitarios. En los últimos años han sido numerosos los recursos invertidos por las universidades con el fin de desarrollar acciones encaminadas a facilitar una información amplia y clara a los futuros alumnos. En este trabajo se presenta el proyecto de transición de la Universitat Politècnica de València (UPV), atendiendo a dos momentos: orientación preuniversitaria y primer año en la universidad. Los objetivos primordiales del proyecto son facilitar la transición de los estudiantes a la universidad, planteando acciones informativas y prácticas sobre los estudios ofertados para ayudar al futuro alumno en su toma de decisiones; y establecer distintas vías de apoyo a través de la tutoría que favorezcan la adaptación del estudiante al entorno universitario y su desarrollo integral. El proyecto institucional de transición de educación secundaria a la universidad de la UPV está coordinado por el Área de Comunicación y el Instituto de Ciencias de la Educación (ICE-UPV) de esta universidad. Éste es un proyecto vivo y abierto que permite adaptaciones según las necesidades que se plantean por parte de los orientadores, tutores y de alumnos preuniversitarios y universitarios.García Félix, VE.; Conejero Casares, JA.; Diez Ruano, JL. (2014). La entrada en la Universidad: un reto para la orientación académica. REDU. Revista de Docencia Universitaria. 12(2):255-280. https://doi.org/10.4995/redu.2014.5650S25528012

A system to monitor and model the thermal isolation of coating compounds applied to closed spaces

[EN] Smart control systems and new technologies are necessary to reduce the energy consumption in buildings while achieving thermal comfort. In this work, we monitor the thermal evolution inside a scale reduced closed space whose exterior and/or interior wall faces have been painted with a coating solution. Based on the experimental data obtained under different environmental conditions, a simulator was developed and tuned to reproduce the thermodynamic behavior inside the spaces, with a relative error of less than 3.5%. This simulator lets us also estimate energy savings, temperature, and flux behavior under other conditions.This research was supported by the National Doctoral Program of the Colombian Administrative Department of Science Technology and Innovation (Colciencias).Florez Montes, F.; Fernández De Córdoba, P.; Higón Calvet, JL.; Conejero, JA.; Poza-Lujan, J. (2020). A system to monitor and model the thermal isolation of coating compounds applied to closed spaces. Thermal Science. 24(3A):1885-1892. https://doi.org/10.2298/TSCI190525077MS18851892243