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A Generalization Performance Study Using Deep Learning Networks in Embedded Systems
Full text linkDeep learning techniques are being increasingly used in the scientific community as a consequence of the high computational capacity of current systems and the increase in the amount of data available as a result of the digitalisation of society in general and the industrial world in
particular. In addition, the immersion of the field of edge computing, which focuses on integrating artificial intelligence as close as possible to the client, makes it possible to implement systems that act in real time without the need to transfer all of the data to centralised servers. The combination of these two concepts can lead to systems with the capacity to make correct decisions and act based on them immediately and in situ. Despite this, the low capacity of embedded systems greatly hinders this integration, so the possibility of being able to integrate them into a wide range of micro-controllers can be a great advantage. This paper contributes with the generation of an environment based on Mbed OS and TensorFlow Lite to be embedded in any general purpose embedded system, allowing the introduction of deep learning architectures. The experiments herein prove that the proposed system is competitive if compared to other commercial systems
Industrial Design of Electric Machines Supported with Knowledge-Based Engineering Systems
Full text linkThe demand for electric machines has increased in the last decade, mainly due to applications that try to make a full transition from fuel to electricity. These applications encounter the need for tailor-made electric machines that must meet demanding requirements. Therefore, it is necessary for small-medium companies to adopt new technologies offering customized products fulfilling the customers’ requirements according to their investment capacity, simplify their development process, and reduce computational time to achieve a feasible design in shorter periods. Furthermore, they must find ways to retain know-how that is typically kept within each designer to retrieve it or transfer it to new designers. This paper presents a framework with an implementation example of a knowledge-based engineering (KBE) system to design industrial electric machines to support this issue. The devised KBE system groups the main functionalities that provide the best outcome for an electric machine designer as development-process traceability, knowledge accessibility, automation of tasks, and intelligent support. The results show that if the company effectively applies these functionalities, they can leverage the attributes of KBE systems to shorten time-to-market. They can also ensure not losing all knowledge, information, and data through the whole development process
«The Witches You Could not Burn». Deconstruction and Reassigment of the Witch as a Monstrous Feminine Figure in the Feminist Movement
Full text linkDesde finales de los años 60 del siglo xx el movimiento feminista intensificó la recuperación de las figuras femeninas monstruosas que el poder patriarcal había vinculado con la transgresión de las normas de género, de la corporalidad, la sexualidad o la moral. Este artículo explora el camino de deconstrucción y restitución de la bruja, arquetipo del monstruo femenino a quien el feminismo ha dotado de un nuevo significado subversivo desde la resistencia y la acción. La perspectiva de género guía el estudio de su transformación en nuevo icono del feminismo a través de diversos contextos: por un lado, el ámbito teórico, la militancia y los colectivos de mujeres que impulsaron el proceso de resignificación y se han re-apropiado de esta figura en forma de reivindicación; por otro, la práctica artística donde se ha reinterpretado la asociación de lo femenino con lo monstruoso, lo siniestro o lo abyecto.Since the late 60s of the 20th century, the feminist movement intensified the recovery of those monstrous female figures that the patriarchal power had linked to the transgression of gender, body, sexuality or moral rules. This paper examines the path of deconstruction and restitution of the witch, archetype of the female monster. Feminism has endowed it with a new subversive meaning in terms of resistance and action. This research, guided by gender perspective, focuses on its transformation into a new feminist icon examining various contexts: on the one hand, feminist theory, women collectives and feminist militancy responsible for encouraging the reassignment process and promotion of this figure as a vindication tool; on the other hand, the artistic practice in which the association between women and the monstrous, the uncanny or the abject has been performed in new ways
Patient Journey Mapping in human-centered design: a critical review
Full text linkRecent studies indicate that a positive Patient eXperience (PX) leads to a faster patient recovery, greater safety and lower costs for the healthcare system. Therefore, PX design is fundamental for hospitals service delivery. The Patient Journey Map (PJM) is a healthcar-specific tool that goes beyond the static view of other Human-Centered Design (HCD) methods by illustrating the relationship between the patient and the service organization as dynamic, ubiquitous and chronological within the system. The literature suggests that the PJM tool has the potential of PX explicit understanding; however, the way of mapping it is diverse, variable and subjective depending on the investigation. This article identifies, through a systematic search, investigations that use the PJM method with a HCD approach. Then, performs a critical analysis based on eleven items that critically review: (1) the nature of mapped information; (2) the purpose of its usage; and (3) the ease of use. As a result, a standardized, structured and reproducible PJM model is proposed that combines all these variables.Una eXperiencia de Paciente (PX) positiva conlleva una recuperación del paciente más rápida, mayor seguridad y menores costos para el sistema de salud, por ello constituye un aspecto fundamental para diseñar nuevos servicios hospitalarios. El Patient Journey Map (PJM) es una herramienta específica para el sector de la salud que va más allá de la vista estática de otros métodos del diseño centrado en las personas (HCD) al ilustrar la relación entre el usuario y la organización de servicios de forma dinámica, ubicua y cronológica. La literatura sugiere que la herramienta PJM alberga potencial para la comprensión explícita de la PX. Sin embargo, la aplicación del PJM es diversa, variable y subjetiva en función del equipo de investigación. Este artículo identifica a través de una búsqueda sistemática investigaciones que emplean el método PJM, a continuación, realiza un análisis crítico en base a once ítems que evalúan: (1) la tipología de información mostrada; (2) el uso que los equipos de diseño implicados hacen de la herramienta; y (3) su facilidad de uso. Como resultado, se propone un modelo estandarizado, estructurado y reproducible del PJM que aúne todas estas variables
Initiation of dynamic recrystallization of as-cast N08028 alloy
Full text linkThe use of high nickel content austenitic stainless steels (SASS) has significantly increased in the last decade. The corrosion and high fatigue resistance of these materials make them suitable for manufacturing oil country tubular goods (OCTG). SASS are processing by forging from casting conditions. Dynamic recovery (DRV) and recrystallization (DRX) of as-cast super austenitic stainless steel, N08028 Alloy, is investigated to study the refining effect from the as-cast grain structure to fully recrystallized austenite due to hot deformation. Both the critical stress and strain for the initiation of DRX are determined using the flow curves. To perform this analysis, hot compression tests are performed at temperatures between 900°C and 1250°C, and strain rates between 0.1 s-1 and 10 s-1, up to 0,8 final strain using a Gleeble®3800 thermomechanical simulator. Subsequently, the Johnson-Avrami-Mehl-Kolmogorow (JMAK) model is used to numerically fit the flow curves and consequently determine the critical strain. No critical points are seen for temperatures under 1100°C. Above this temperature, the JMAK model proves to be valid in all studied strain rates
Optimum Slot and Pole Design for Vibration Reduction in Permanent Magnet Synchronous Motors
Full text linkPermanent Magnet Synchronous Motors (PMSMs) are increasingly being used and are required to satisfy noise and vibration specifications. Thus, it is necessary to develop design guidelines for electric motors that consider vibration response as a key output of the design. This work shows the influence of the main design parameters regarding PMSMs: the number of slots and the number of poles. First, the influence of the number of slots in the natural frequencies is analysed by Finite Element calculations, which are experimentally verified. Then, the analytical calculation of the vibration response is explained. This is applied for several combinations of the number of slots and the number of poles, and the results are compared. Considering the analytical development, a procedure to choose the most adequate combination of the number of slots and poles is proposed. The analytical predictions are validated according to experimental measurements in two machines
Contact pressure, sliding velocity and viscosity dependent friction behavior of lubricants used in tube hydroforming processes
Full text linkThe final quality of sheet and tube metal formed components strongly depends of the tribology and friction conditions between the tools and the material to be formed. Furthermore, it has been recently demonstrated that friction is the numerical input parameter that has the biggest effect in the numerical models used for feasibility studies and process design. Industrial dedicated software packages have introduced friction laws which are dependent on sliding velocity, contact pressure and sometimes strain suffered by the sheet and currently, temperature dependency is being implemented as it has also major effect on friction. This last dependency on temperature is attributed to the viscosity change of the lubricant with temperature. In this work, three lubricant having different viscosity have been characterized using the tube sliding test. The final aim of the study is to obtain friction laws that are contact pressure and sliding velocity dependent for their use in tube hydroforming modelling. The tests, performed at various contact pressures and velocities, demonstrate that viscosity has a major effect on friction. As shown in the literature, the friction coefficient is also varying with the contact pressure and sliding velocity
The Interaction between the Sheet/Tool Surface Texture and the Friction/Galling Behaviour on Aluminium Deep Drawing Operations
Full text linkThe increasing demands for lightweight design in the transport industry have led to an extensive use of lightweight materials such as aluminium alloys. The forming of aluminium sheets however presents significant challenges due to the low formability and the increased susceptibility to galling. The use of tailored workpieces and controlled die roughness surfaces are common strategies to improve the tribological behaviour, whilst galling is still not well understood. This work is aimed at analysing the interplay between the sheet and tool surface roughness on the friction and galling performance. Different degrees of Electro Discharge Texturing (EDT) textures were generated in AA1050 material strips, and tooling presenting different polishing degrees were prepared. Strip drawing tests were carried out to model the tribological condition and results were corroborated through cup drawing tests. A new galling severity index (GSI) is presented for a quick and quantitative determination of both galling occurrence and severity. The present study underlines the key role of die topography and the potential of die surface functionalization for galling prevention
Clinical long-term nocturnal sleeping disturbances and excessive daytime sleepiness in Parkinson's disease
No full textObjective
To prospectively evaluate nocturnal sleep problems and excessive daytime sleepiness (EDS) in Parkinson’s disease (PD) patients, and analyze the influence of motor symptoms, treatment, and sex differences on sleep problems in PD.
Methods
Sleep disturbances of 103 PD patients were assessed with Parkinson’s Disease Sleep Scale (PDSS) and the Epworth Sleepiness Scale (ESS). Student’s t-test for related samples, one-way ANOVA with Tukey’s HSD post hoc test were used to assess group differences. Bivariate correlations and mixed-effects linear regression models were used to analyze the association between clinical aspects and sleep disturbances over time.
Results
At baseline, 48.5% of PD patients presented nocturnal problems and 40% of patients presented EDS. The PDSS and ESS total score slightly improve over time. Nocturnal problems were associated with age and motor impartment, explaining the 51% of the variance of the PDSS model. Males presented less nocturnal disturbances and more EDS than females. Higher motor impairment and combined treatment (L-dopa and agonist) were related to more EDS, while disease duration and L-dopa in monotherapy were related to lower scores, explaining the 59% of the model.
Conclusions
Sleep disturbances changed over time and age, diseases duration, motor impairment, treatment and sex were associated with nocturnal sleep problems and EDS. Agonist treatment alone or in combination with L-dopa might predict worse daytime sleepiness, while L-dopa in monotherapy is related to lower EDS, which significantly affects the quality of life of PD patients
Mozkin asmoagatik ez bada, zein da ba asmoa? Ekintzailetza sozial kooperatiborako adierazle sistema baten proposamena
Full text linkJarraian aurkezten den lanean ekintzailetza sozial kooperatiboen asmo soziala
gidatzen lagun dezakeen adierazle sistema baten proposamena egiten da. Adierazle
sistema bera ekintzailetza sozial kooperatiboa ulertzeko eta praktikatzeko modu batetik eraikia izan da, beraz, ekintzailetza sozial kooperatiboaren dimentsio soziala
elikatu eta gidatzeaz gain bere horretan oinarri ere bada. Oinarri eta ipar izateko
tresna izan daiteke proposatzen den adierazle sistema