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Wind turbine pitch reinforcement learning control improved by PID regulator and learning observer
No full textWind turbine (WT) pitch control is a challenging issue due to the non-linearities of the wind device and its
complex dynamics, the coupling of the variables and the uncertainty of the environment. Reinforcement learn-
ing (RL) based control arises as a promising technique to address these problems. However, its applicability
is still limited due to the slowness of the learning process. To help alleviate this drawback, in this work we
present a hybrid RL-based control that combines a RL-based controller with a proportional–integral–derivative
(PID) regulator, and a learning observer. The PID is beneficial during the first training episodes as the RL based
control does not have any experience to learn from. The learning observer oversees the learning process by
adjusting the exploration rate and the exploration window in order to reduce the oscillations during the training
and improve convergence. Simulation experiments on a small real WT show how the learning significantly
improves with this control architecture, speeding up the learning convergence up to 37%, and increasing the
efficiency of the intelligent control strategy. The best hybrid controller reduces the error of the output power
by around 41% regarding a PID regulator. Moreover, the proposed intelligent hybrid control configuration has
proved more efficient than a fuzzy controller and a neuro-control strategy.This work was partially supported by the Spanish Ministry of Sci- ence, Innovation and Universities under MCI/AEI/FEDER Project num- ber RTI2018-094902-B-C21
An Assessment on the Efficiency of Clothing with UV Protection among the Spanish Navy School Students
Get PDFConcern about the harmful effects that ultraviolet (UV) rays have on the skin of people who are routinely exposed to solar radiation has driven the industry of skin protection creams, sunglasses and clothing. Spanish Navy personnel are subject to different levels of exposure depending on their rank and function. The objective of this research is to analyze the behavioral variables associated to the effects on the skin caused by UV rays, denoted by the combined effects of perceived susceptibility and perceived severity, on their decision to purchase and wear uniforms with UV protection. A confirmatory analysis using a structural equation modeling (SEM) was performed on a sample of 100 respondents. The model results revealed a strong mediating characteristic of the intention to use, variable associated with the exogenous variables. Attitude towards the use of clothing and social influence, as well as the exogenous variable clothing action planning, on the sun protective clothing use during tactical maneuvers. These relationships were significant with p-values close to zero. However, exogenous variables related to perceived susceptibility and perceived severity in exposure to sunlight did not represent a significant influence when mediated by self-efficacy in use. The results revealed the consequence of awareness about the importance of protecting oneself and the influence that usage habits can have on the military with respect to the decision to purchase uniforms with UV protection.The authors gratefully acknowledge the financial support provided by the Spanish Ministry of Science & Innovation under the I+D+i state program “Challenges Research Projects” (RTI2018-098900-B-I00) and the Regional Government of Castilla y León (INVESTUN/19/BU/004 and INVESTUN/22/BU/0001)
Phases in the decision to request euthanasia and brain structures involved
No full textIntroducción: Las leyes de eutanasia no mencionan como obstáculo las enfermedades cerebrales diferentes de la demencia, pero que dañan los circuitos involucrados en la toma de decisiones.
Desarrollo: Revisión narrativa de las etapas de la decisión de solicitar la eutanasia y las áreas cerebrales involucradas. La amígdala, la corteza cingulada, la ínsula y distintas partes de los lóbulos prefrontales se activan durante decisiones con similitudes a la de solicitar la eutanasia.
Conclusiones: Cuando se conoce una lesión o mal funcionamiento de alguna de las estructuras involucradas en la toma de decisiones, se debe realizar una evaluación específica de la influencia que pueda tener en la competencia del paciente para solicitar la eutanasia.Introduction: Euthanasia laws do not mention as an obstacle brain diseases other than dementia that damage circuits
involved in decision-making.
Development: Narrative review of the stages of the decision to request euthanasia and the brain areas involved. The
amygdala, the cingulate and insular cortex, and different parts of the prefrontal lobes are activated during decisions with
similarities to that of requesting euthanasia.
Conclusions: When an injury or malfunction of any of the structures involved in making decisions is known, a specific
evaluation should be made of the influence it may have on the competence of the patient to request euthanasia
Management control systems in the competitive sucess and performance of SMEs
No full textLos factores clave de éxito, como la internacionalización y la formación del capital humano, permiten obtener ventajas competitivas que redundan en aumentos del rendimiento. La adopción de diversas herramientas de control de gestión permite la correcta gestión de estos factores, sin embargo, qué efectos producen no ha sido suficientemente analizado. El objetivo principal de este trabajo es determinar el efecto mediador del uso de una diversidad de sistemas de control de gestión (SCG) en la relación entre los factores de éxito –capital humano formado y capacidad de internacionalización– y el rendimiento. Tomando como muestra el sector agroalimentario español, los resultados evidencian que, la internacionalización tiene una relación directa y positiva con el rendimiento, mientras que la formación del capital humano se relaciona indirecta y positivamente con el rendimiento a través de un alto uso de diversos SCG.Key factors such as internationalization and human capital training foster competitive advantages that increase performance. The adoption of a set of management control tools enables the correct management of these factors, however, the effect of those systems has not been sufficiently analyzed in the literature. The main objective of this paper is to determine the mediating effect of the diversity of use of the management control systems (MCS) in the relationship between the success factors –human capital training and internationalization–, and performance. Using a sample of Spanish firms from the food industry, the results show that internationalization has a direct positive impact on organizational performance, while human capital training is indirectly and positively related to performance through the use of a high diversity of MCS
Visual identities of the Nueva Movida in the urban context through Spanish photography. Changes and generation paradigms looking at Madrid
No full textEl contexto cultural dela Movida madrileña ha cambiado para dejar de lado los espacios comunes construidos mediante la colectividad, y desembocar en un paisaje individualista y adolescente que desdeña la adquisición de la responsabilidad adulta. En este nuevo panorama, la llamada Nueva Movida ha desarrollado una fotografía de corte juvenil e intimista en la que el sujeto se ha convertido también en el creador de su propio género y sexualidad. Sin embargo, ambas generaciones se dan en el contexto urbano de la ciudad de Madrid; un espacio que ha cambiado de forma de mirar y de ser mirado para denotar un lugar que funcione, ya no para la colectividad de los años ochenta, sino para el ser único e individualizado que se reivindica a sí mismo. El presente estudio pretende arrojar luz sobre el uso que conlleva el tratamiento de Madrid en la fotografía practicada por una generación que ha sido etiquetada como heredera de la que reivindicó las calles de la ciudad para representarse.The cultural context of the Movidahas changed to put aside the common spaces built by the community to lead to an individualistic and adolescent landscape that disdains adult responsibilities. The Nueva Movida has developed a youthful and intimate photography in which the subject has also become the creator of his own gender and sexuality. However, both generations occur in the urban context of Madrid; an urban landscape that has changed its way of looking and being looked by itself, to develop a place that works, no longer for the community of the eighties, but for the unique and individualized being of the new century. The present study tries to focus on the treatment of Madrid in the photography practiced by a generation that has been named as the natural heir of the streets of the city
Utilización de laboratorios virtuales para la docencia en ciencias de la salud e ingeniería informática
No full textLas reglas de escritura del prototipo ficcional
No full textHere we propose a new perspective regarding the difference between literary fiction and nonfiction: the very different nature of the writing rules they admit. Although with some limitations, non-fictional narratives admit more or less rigid writing rules because they are obligated to maintain a certain correspondence scheme with the real world. However, fictional literary narrations, freed from any strict or systematic correspondence with reality, do not admit these fixed rules. Given that in fiction it is not possible to have such a text-word correspondence scheme, we defend that the only rules (or rather, the only guidelines) fictional literary narrations admit are those which affect the very creation of the text—that is, those which affect the subjective attitude of the writer.Proposem una nova perspectiva respecte a la diferència entre la ficció literària i la no ficció: la diferent naturalesa de les regles d’escriptura que admeten. Encara que amb algunes limitacions, les narracions de no ficció admeten regles d’escriptura més o menys rígides perquè estan obligades a mantenir certs esquemes de correspondència amb el món real. No obstant això, les narracions literàries ficcionals, alliberades de qualsevol correspondència estricta o sistemàtica amb la realitat, no admeten regles fixes. Com que en la ficció no és possible tenir un esquema de correspondència text-paraula, defensem que les úniques regles (o millor, les úniques pautes) que admeten les narracions literàries ficcionals són aquelles que afecten a la creació mateixa del text, és a dir, les que incideixen en l’actitud subjectiva de l’escriptor.Aquí proponemos una nueva perspectiva respecto a la diferencia entre la ficción literaria y la no ficción: la naturaleza muy diferente de las reglas de escritura que admiten. Aunque con algunas limitaciones, las narraciones de no ficción admiten reglas de escritura más o menos rígidas porque están obligadas a mantener un cierto esquema de correspondencia con el mundo real. Sin embargo, las narraciones literarias ficcionales, liberadas de cualquier correspondencia estricta o sistemática con la realidad, no admiten estas reglas fijas. Dado que en la ficción no es posible tener tal esquema de correspondencia texto-palabra, defendemos que las únicas reglas (o más bien, las únicas pautas) que admiten las narraciones literarias ficcionales son aquellas que afectan a la creación misma del texto, es decir, las que inciden en la actitud subjetiva del escritor
Experimental verification of a beam element for thin-walled beams with torsion, distortion, and shear lag
No full textBeam-type elements based on the theories of Euler–Bernoulli, Timoshenko, and Vlasov are widely used in
civil engineering. However, shell and solid finite elements are often used when the effects on normal stresses
of either shear deformation or distortion are considered important. Numerically validated in an earlier study
with finite element models for shell-type structures, the same one-dimensional finite element model is further
developed in this study with a low number of degrees of freedom per node that includes all the structural
mechanisms without using 3D finite element models. Laboratory testing of an instrumented steel box girder
is conducted, to improve validation of the goodness of fit of the finite element model with real structural
behavior.This work was supported by the Junta de Castilla y León (Spain), provided through research project BU062G19
Research project. Restless legs syndrome: follow-up of an adult population cohort in Burgos
No full textObjetivos: estudiar la evolución de la cohorte a la largo de 11 años (2007-2018). Mientras que, los objetivos específicos han sido: analizar las diferencias entre casos y controles; conocer la tasa de mortalidad de la cohorte y su relación con el síndrome de piernas inquietas; estimar el impacto del síndrome de piernas inquietas en la calidad de vida relacionada con la salud y el sueño. Métodos: el estudio ha seguido una metodología observacional, retrospectiva y longitudinal de una cohorte de casos y controles, formada por 232 pacientes. En ambas evaluaciones se recogieron datos sociodemográficos, clínicos (se administraron las siguientes escalas: EuroQol, Índice de Comorbilidad de Charlson, escala de ansiedad y depresión de Goldberg, escala de somnolencia de Epworth y el cuestionario de Calidad de Vida del síndrome de piernas inquietas) y analíticos, y en la segunda evaluación también se recolectaron datos de actigrafía (actividad física y sueño).Objective: to study the evolution of the cohort over 11 years (2007-2018). Considering that the specific objectives have been: to analyze the differences between cases and controls; know the mortality rate of the cohort and its relationship with restless legs syndrome; estimate the impact of restless legs syndrome on health and sleep- related quality of life. Methods: the study has followed an observational, retrospective and longitudinal methodology of a cohort of cases and controls, made up of 232 patients. Sociodemographic and clinical data were collected in both evaluations (the following scales were administered: EuroQol, Charlson's Comorbidity Index, Goldberg's anxiety and depression scale, Epworth's sleepiness scale and the Quality-of-Life questionnaire for restless legs syndrome) and analytical, and in the second evaluation actigraphy data (physical activity and sleep) were also collected.El proyecto fue financiado con una beca del Servicio de Salud de Castilla y León (Sacyl), GRS 1764/A/18