La pluralidad de sus miembros y la apertura de miras del Grupo Comunicar serán propicias a asumir cualquier cambio que pueda venir en el futuro de las Comunicaciones

Entrevista realizada por Enrique Martínez-Salanova, Director de la Revista Aularia a Manuel Jorge Martínez Muñoz Maestro, pionero de la integración entre comunicación y educación, experto en TICs y su aplicación en las aulas, iniciador de numerosas Webs de universidades y escuelas, actualmente es responsable del proyecto informático de la Revista Aularia del Grupo Comunica

Infraestructura para la comunicación entre componentes Java en el estilo arquitectónico C2

En este trabajo se describe el diseñno y la implementación de una infraestructura para la comunicación entre componentes que sigan el estilo arquitectóonico C2 sobre una plataforma Java. Un requisito de esta infraestructura es que componentes y conectores se ejecuten cada uno en su propia máquina virtual (JVM) en el mismo nodo o en nodos diferentes. Se ha diseñado un conjunto de clases que proporcionan mecanismos para la comunicación entre componentes y conectores C2. Como parte del trabajo, se han evaluado las tecnologías disponibles para Java que permiten construir la infraestructura, habiéndose elegido la invocación remota a método (RMI) como la base para la comunicación entre los componentes del sistem

Estudio sobre el impacto de la geometría de toberas diesel en el desarrollo del chorro, la formación de la mezcla y la combustión

Tesis por compendio[ES] El empuje actual de las normativas de emisiones y una conciencia social cada vez más crítica en este aspecto, ha llevado a la industria automotriz a elevar sus estándares en eficiencia a cimas nunca antes vistas. Con el mayor peso de las nuevas normativas puesto sobre los vehículos Diesel, la presión ejercida sobre esta tecnología es, si cabe, aún más crítica. Dada la necesidad de mantener este tipo de plantas propulsivas en determinadas aplicaciones, como son el transporte terrestre pesado, maquinaria o en el transporte marítimo, es también necesario mantener su desarrollo. Como parte fundamental de los motores Diesel, el sistema de inyección interviene directamente en la generación de la energía. La mejora y optimización de su funcionamiento repercute sobre la cadena de eficiencias del sistema. Esta tesis pretende contribuir al desarrollo de las plantas propulsivas Diesel en este aspecto y, concretamente, en el estudio de las geometrías de toberas Diesel de inyección directa. A lo largo del texto, este tipo de geometrías son estudiadas tanto desde la perspectiva del flujo interno como del flujo externo. Los estudios combinan modelos numéricos Eulerianos (para flujo interno o interno-externo acoplado), modelos Lagrangianos discretos (para el estudio del chorro), junto con medidas experimentales diversas que avalan los análisis ejecutados. La exploración de las geometrías propuestas no queda acotada solamente a formas circulares, más convencionales, sino que también se ha extendido a toberas de morfologías más innovadoras como son las elípticas. Las metodologías presentadas demuestran ser eficaces en el estudio de estos sistemas y una herramienta a tener en cuenta en la mejora de su diseño. Los distintos resultados obtenidos defienden, además, como la geometría de la tobera es un condicionante del desarrollo posterior de la mezcla y puede ser utilizada como elemento de optimización de la misma.[CA] L'actual impuls de les normatives d'emissions i una consciència social cada vegada més crítica en aquest aspecte ha portat a la indústria automobilística a elevar els seus estàndards d'eficiència a cotes mai vistes abans. Amb el major pes de les noves normatives imposades als vehicles dièsel, la pressió exercida sobre aquesta tecnologia és, si cap, encara més crítica. Donada la necessitat de mantenir aquest tipus de plantes propulsives en determinades aplicacions, com el transport terrestre pesat, maquinària o el transport marítim, és també necessari mantenir el seu desenvolupament. Com a part fonamental dels motors dièsel, el sistema d'injecció intervé directament en la generació d'energia. La millora i optimització del seu funcionament repercuteix en la cadena d'eficiències del sistema. Aquesta tesi pretén contribuir al desenvolupament de les plantes propulsives dièsel en aquest aspecte i, concretament, en l'estudi de les geometries de bussons dièsel d'injecció directa. Al llarg del text, aquest tipus de geometries són estudiades tant des de la perspectiva del flux intern com del flux extern. Els estudis combinen models numèrics Eulerians (per a flux intern o intern-extern acoblat), models Lagrangians discrets (per a l'estudi del corrent), juntament amb mesures experimentals diverses que avalen els anàlisis realitzats. L'exploració de les geometries proposades no queda acotada només a formes circulars, més convencionals, sinó que també s'ha estès a bussons de morfologies més innovadores com les el·líptiques. Les metodologies presentades demostren ser eficaces en l'estudi d'aquests sistemes i una eina a tenir en compte en la millora del seu disseny. Els diferents resultats obtinguts també argumenten que la geometria del busó és un condicionant del desenvolupament posterior de la barreja i pot ser utilitzada com a element d'optimització de la mateixa.[EN] The current push for emissions regulations and an increasingly critical social awareness in this regard has led the automotive industry to raise its efficiency standards to unprecedented heights. With greater emphasis on new regulations placed on Diesel vehicles, the pressure on this technology is even more critical. Given the need to maintain such propulsion systems in specific applications like heavy land transport, machinery, or maritime transportation, it is also necessary to continue their development. As a fundamental part of Diesel engines, the injection system directly affects energy generation. Improving and optimizing its operation has an impact on the overall efficiency of the system. This thesis aims to contribute to the development of Diesel propulsion systems in this regard, specifically in the study of direct injection Diesel nozzle geometries. Throughout the text, these types of geometries are examined from both internal and external flow perspectives. The studies combine Eulerian numerical models (for internal or coupled internal-external flow), discrete Lagrangian models (for jet analysis), along with various experimental measurements that support the conducted analyses. The exploration of proposed geometries is not limited to conventional circular shapes but has also extended to more innovative morphologies such as elliptical nozzles. The presented methodologies prove to be effective in studying these systems and serve as a valuable tool in improving their design. The different results obtained also argue that nozzle geometry is a determining factor in the subsequent mixture development and can be used as an optimization element for it.Las investigaciones de esta tesis han sido respaldadas por el Ministerio de Ciencia, Innovación y Universidades el Gobierno de España y mis estudios de doctorado han sido financiados por la Agencia Estatal de Investigación del gobierno de España y el Fondo Social Europeo. Dichas ayudas se concretaron dentro del marco del proyecto "Desarrollo de modelos de combustión y emisiones HPC para el análisis de plantas propulsivas de transporte sostenibles" (TRA2017-89139-C2-1-R) a través del "Subprograma Estatal de Formación del Programa Estatal de Promoción del Talento y su Empleabilidad en I+D+i".Martínez-Miracle Muñoz, EC. (2024). Estudio sobre el impacto de la geometría de toberas diesel en el desarrollo del chorro, la formación de la mezcla y la combustión [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/203126Compendi

Auto-Guided Movements on Minimally Invasive Surgery for Surgeon Assistance

This paper focuses on autonomous movements to aid the surgeon to perform certain tasks. Robotic assistants have solved the drawbacks of Minimally Invasive Surgery (MIS) and provide additional skills to the surgeons. However, some authors argue that these systems could lengthen the operating time. The solution is the automation of certain maneuvers that help the surgeon during a surgical maneuver. This work proposes control architecture for a surgical robot capable of performing autonomous movements. In this way, a trajectory planner based on a behavior concept computes the required velocity vector of the surgical instrument hold by the robot. This planner has been implemented and tested on the control architecture of the surgical assistant CISOBOT, designed and developed at the University of Malaga.This work was supported in part by the Spanish National projects DPI2007-62257 and the Regional one P07-TEP-02897

A Multi-Behaviour Algorithm for Auto- Guided Movements in Surgeon Assistance

This paper focuses on autonomous movements to aid the surgeon to perform certain tasks. Robotic assistants have solved the drawbacks of Minimally Invasive Surgery (MIS) and provide additional skills to the surgeons. However, some authors argue that these systems could lengthen the operating time. The solution is the automation of certain maneuvers that help the surgeon during a surgical maneuver. This work proposes control architecture for a surgical robot capable of performing autonomous movements. In this way, a trajectory planner based on a behaviour concept computes the required velocity vector of the surgical instrument hold by the robot.P07-TEP-0289

Exploratory factorial structure climate and labor flexibility

Objetivo. El clima laboral ha sido estudiado como un área inherente al liderazgo. En el caso del que se distingue por su comunicación y motivación vertical, el ambiente de trabajo ha sido considerado como un factor determinante de la flexibilidad en términos de condiciones, salarios y beneficios. En este sentido, el objetivo de este documento ha sido explorar las dimensiones del clima y la flexibilidad laboral para establecer las relaciones de dependencia entre sus indicadores. Se realizó un estudio no experimental, transversal y correlacional con una selección de muestras no probabilística de 300 empleados del centro de México. El clima laboral determina la flexibilidad, aunque la literatura más reciente advierte que más bien el clima media la relación entre las políticas de flexibilidad sobre la rotación de personal, el salario informal y la ausencia de beneficios. Se recomiendan líneas de investigación sobre la incidencia de los estilos de liderazgo en las variables en cuestión.Objective. Gross mode, the work climate has been studied as an area inherent in leadership. In the case of the one that is distinguished by its communication and vertical motivation, the work environment has been addressed as a determinant of flexibility in terms of conditions, salaries and benefits. In this regard, the objective of this paper has been to explore the dimensions of climate and labor flexibility in order to establish the dependency relationships between its indicators. Methodology. A non-experimental, cross-sectional and correlational study was carried out with a non-probabilistic sample selection of 300 employees from central Mexico. Results and conclusions. The labor climate determines the flexibility, although the most recent literature warns that rather the climate mediates the relationship between the flexibility policies on staff turnover, the informal salary and the absence of benefits. Research lines are recommended concerning the incidence of leadership styles in the variables in question

An analysis of heuristic metrics for classifier ensemble pruning based on ordered aggregation

Classifier ensemble pruning is a strategy through which a subensemble can be identified via optimizing a predefined performance criterion. Choosing the optimum or suboptimum subensemble decreases the initial ensemble size and increases its predictive performance. In this article, a set of heuristic metrics will be analyzed to guide the pruning process. The analyzed metrics are based on modifying the order of the classifiers in the bagging algorithm, with selecting the first set in the queue. Some of these criteria include general accuracy, the complementarity of decisions, ensemble diversity, the margin of samples, minimum redundancy, discriminant classifiers, and margin hybrid diversity. The efficacy of those metrics is affected by the original ensemble size, the required subensemble size, the kind of individual classifiers, and the number of classes. While the efficiency is measured in terms of the computational cost and the memory space requirements. The performance of those metrics is assessed over fifteen binary and fifteen multiclass benchmark classification tasks, respectively. In addition, the behavior of those metrics against randomness is measured in terms of the distribution of their accuracy around the median. Results show that ordered aggregation is an efficient strategy to generate subensembles that improve both predictive performance as well as computational and memory complexities of the whole bagging ensemble.We would like to thank the anonymous reviewers for their dili- gent work and efficient effort s. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement N ◦ 665959. Besides, this work was supported in part by the LOGISTAR project, funded by the European Union Horizon 2020 Research and Innovation Programme grant agreement No. 769142 . Michal Woz- niak was partially supported by the Polish National Science Cen- ter under the grant No. 2017/27/B/ST6/01325. Gonzalo Martínez- Munoz was partially supported by PID2019-106827GB-I00 / AEI / 10.13039/50110 0 011033

Steady-state and transient conductivity of collodial solutions of gold nanobeads

Steady-state and transient conductance measurements of gold nanobeads solutions deposited on top of interdigitated electrodes have been performed. It is shown that the application of an electric field of moderate value between electrodes during the drying process of the droplet makes the resulting steady-state conductance value to increase significantly. The dynamics of the gold nanobeads in the solution has been studied by means of transient current measurements during the drying process and the effects correlated to the changes in the morphology of the association of the gold nanobeads when they reach the substrate. It is seen that the application of the electric field foster the formation of gold beads monolayers, chains, and dendritic associations which, in combination with the humidity conditions of the sample surface, are believed to be the reasons for the conductance increase.Peer Reviewe

Estudio de Mobbing en una institución de educación superior en Hidalgo

The objective of this research is to conduct a study to determine the degree of bullying perceived or perceived in the teaching staff of a public institution of higher education (IES), located in the central part of the state of Hidalgo, based on the theoretical position and conceptual of Leymann. This research considers the conceptualization of the mobbing phenomenon, from its antecedents, concepts and studies in the organizational context. The instrument that allows the measurement of mobbing, supported with validity and reliability, is the questionnaire called LIPT-60 ("Leymann Inventory of Psychological Terrorization"). The results obtained describe the existence of mobbing in the institution of higher education, with values observed below level 1, specifically in the subscales of job loss, incommunication, and overt intimidation. That is why in higher education institutions is essential to perform this type of work in order to identify, assess and know if there are risks of workplace harassment, to be in possibility if this were the case to have timely preventive measures. In this context, analyzing the results will establish prevention strategies to reduce or eradicate workplace harassment in this organization.El objetivo de a presente investigación es realizar un estudio para determinar el grado de acoso laboral o mobbing percibido en el personal docente de una Institución de educación superior (IES) pública, ubicada en la parte central del estado de Hidalgo, basada en la postura teórica y conceptual de Leymann. Esta investigación considera la conceptualización del fenómeno del mobbing, desde sus antecedentes, conceptos y estudios en el contexto organizacional. El instrumento que permite la medición del mobbing, sustentado con validez y confiabilidad es el cuestionario denominado LIPT-60 («Leymann Inventory of Psychological Terrorization»). Los resultados obtenidos describen la existencia del mobbing en la institución de educación superior, con valores observados por debajo del nivel 1, específicamente en las subescalas de Desprestigio laboral, Incomunicación, e Intimidación manifiesta. Es por ello que en las instituciones de educación superior es fundamental realizar este tipo de trabajos con la finalidad de identificar, evaluar y conocer si existen riesgos de acoso laboral, para estar en posibilidad si así fuera el caso de disponer de medidas preventivas oportunas. En este contexto, el analizar los resultados permitirá establecer estrategias de prevención para disminuir o erradicar el acoso laboral en esta organización

Active learning and generic competences in an operating systems course

The Bologna Declaration and the implementation of the European Higher Education Area are promoting the use of active learning methodologies. The aim of this study is to evaluate the effects obtained after applying active learning methodologies to the achievement of generic competences as well as to the academic performance. This study has been carried out at the Universidad Politécnica de Madrid, where these methodologies have been applied to the Operating Systems I subject of the degree in Technical Engineering in Computer Systems. The fundamental hypothesis tested was whether the implementation of active learning methodologies (cooperative learning and problem based learning) favours the achievement of certain generic competences (‘teamwork’ and ‘planning and time management’) and also whether this fact improved the academic performance of our students. The original approach of this work consists in using psychometric tests to measure the degree of acquired student’s generic competences instead of using opinion surveys, as usual. Results indicated that active learning methodologies improve the academic performance when compared to the traditional lecture/discussion method, according to the success rate obtained. These methods seem to have as well an effect on the teamwork competence (the perception of the behaviour of the other members in the group) but not on the perception of each students’ behaviour. Active learning does not produce any significant change in the generic competence ‘planning and time management’