Specification and unattended deployment of home networks at the edge of the network

Consumer devices continue to expand their capabilities by connecting to digital services and other devices to form information-sharing ecosystems. This is complex and requires meeting connection requirements and minimal processing capabilities to ensure communication. The emergence of new services, and the evolution of current technologies, constantly redefine the rules of the game by opening up new possibilities and increasing competition among service providers. Paradigms such as edge computing, softwarization of physical devices, self-configuration mechanisms, definition of software as a code and interoperability between devices, define design principles to be taken into account in future service infrastructures. This work analyzes these principles and presents a programmable architecture in which services and virtual devices are instantiated in any computing infrastructure, as cloud or edge computing, upon request according to the needs specified by service providers or users. Considering that the target computing infrastructures are heterogeneous, the solution defines network elements and provides network templates to ensure it can be deployed on different infrastructures irrespectively of the vendor. A prototype has been developed and tested on a virtualized cloud-based home network relying on open source solutions.This work was supported in part by the Project MAGOS under Grant TEC2017-84197- C4-1-R; in part by the Comunidad de Madrid (Spain) through the Project CYNAMON under Grant P2018/TCS-4566; and in part by the European Structural Funds (ESF and FEDER)

Perceptually-guided deep neural networks for ego-action prediction: Object grasping

We tackle the problem of predicting a grasping action in ego-centric video for the assistance to upper limb amputees. Our work is based on paradigms of neuroscience that state that human gaze expresses intention and anticipates actions. In our scenario, human gaze fixations are recorded by a glass-worn eye-tracker and then used to predict the grasping actions. We have studied two aspects of the problem: which object from a given taxonomy will be grasped, and when is the moment to trigger the grasping action. To recognize objects, we using gaze to guide Convolutional Neural Networks (CNN) to focus on an object-to-grasp area. However, the acquired sequence of fixations is noisy due to saccades toward distractors and visual fatigue, and gaze is not always reliably directed toward the object-of-interest. To deal with this challenge, we use video-level annotations indicating the object to be grasped and a weak loss in Deep CNNs. To detect a moment when a person will take an object we take advantage of the predictive power of Long-Short Term Memory networks to analyze gaze and visual dynamics. Results show that our method achieves better performance than other approaches on a real-life dataset. (C) 2018 Elsevier Ltd. All rights reserved.This work was partially supported by French National Center of Scientific research with grant Suvipp PEPS CNRS-Idex 215-2016, by French National Center of Scientific research with Interdisciplinary project CNRS RoBioVis 2017–2019, the Scientific Council of Labri, University of Bordeaux, and the Spanish Ministry of Economy and Competitiveness under the National Grants TEC2014-53390-P and TEC2014-61729-EXP.Publicad

Revisão das intervenções que melhoram a percepção da utilidade da aprendizagem dos estudantes

Currently, educators face the challenge of making students consider useful what they teach in class. According to the expectation- value of motivation theory, the perceived usefulness is considered flexible in the face of external interventions. Even though a recent growing body of research has assessed the effectiveness of such interventions, there are no known publications that have reviewed the quantity, characteristics, concepts, correlates, and functioning of the examined interventions. To this end, the intention of this study was to describe the interventions that promote the usefulness perceived by the students. A non-systematic bibliographical review was carried out, producing ad hoc analysis criteria. Twelve interventions were identified, all based on the theoretical expectation-value model. The type, quantity and duration of the activities are diverse, consisting of asking students to make connections between the topics learned in class and their daily lives. Furthermore, the frequency of those connections is the mechanism through which interventions have an effect on learning. This review provides a variety of resources to the practice and research on education in order to produce changes in the perceived usefulness and improve the student’s focus and performance.Actualmente, los docentes se enfrentan al desafío de lograr que los estudiantes perciban como útiles los contenidos que enseñan en clase. Desde la teoría expectativa-valor de la motivación, la utilidad percibida es considerada flexible a las intervenciones externas. Aunque un cuerpo reciente y creciente de investigaciones han evaluado la efectividad de tales intervenciones, no se conocen publicaciones que hayan revisado la cantidad, características, conceptos, correlatos y funcionamiento de las intervenciones investigadas. Para tal fin, en este trabajo se buscó describir las intervenciones que promueven la utilidad percibida por los estudiantes. Se llevó a cabo una revisión bibliográfica no sistemática, construyéndose criterios de análisis ad hoc. Se identificaron doce intervenciones, todas basadas en el modelo teórico de expectativa-valor. El tipo, cantidad y duración de las actividades es diverso y las mismas consisten en pedir a los estudiantes que hagan conexiones de los temas aprendidos en clase con su vida cotidiana. Asimismo, la frecuencia de dichas conexiones es el mecanismo a través del cual las intervenciones poseen efectos sobre el aprendizaje. Esta revisión aporta a la práctica e investigación en educación una diversidad de recursos para producir cambios en la utilidad percibida y mejorar el interés y el rendimiento de los estudiantes.Atualmente, os docentes enfrentam o desafio de fazer com que os estudantes percebam como úteis os conteúdos ensinados na sala de aula. Desde a teoria expectativa-valor da motivação, a utilidade percebida é considerada como flexível diante das intervenções externas. Embora um número crescente e recente de pesquisas tenha avaliado a efetividade de tais intervenções, não há ciência de publicações que tenham revisado a quantidade, características, conceitos, correlatos e funcionamento das intervenções pesquisadas. Este trabalho procurou descrever as intervenções que promovem a utilidade percebida pelos estudantes. Realizou-se uma revisão bibliográfica não sistemática, a partir da construção de critérios de análise ad hoc. Identificaram-se doze intervenções, todas elas baseadas no modelo teórico de expectativa-valor. O tipo, quantidade e duração das atividades diferem. Tais atividades consistem em pedir aos estudantes que façam conexões dos temas aprendidos na sala de aula com a sua vida cotidiana. Da mesma forma, a frequência de tais conexões é o mecanismo pelo qual as intervenções possuem efeitos sobre a aprendizagem. Esta revisão contribui para a prática e a pesquisa em educação com uma diversidade de recursos para produzir mudanças na percepção da utilidade dos conteúdos aprendidos e melhorar o interesse e rendimento dos estudantes

Diseño de obras de mitigación y protección en la zona de equipamiento social de urbanización jardines del rocío, Municipio de Santa Ana, Departamento de Santa Ana

El Salvador es un país altamente perjudicado por una diversidad de fenómenos naturales que constantemente producen situaciones de desastre, las cuales dañan al territorio y a la población, principalmente a aquellas viviendas que se encuentran ubicadas en las zonas más vulnerables y de mayor riesgo; por su poca capacidad para hacer frente y resistir a los efectos de dichos fenómeno

Five-year atmospheric corrosion of cu, cr and ni weathering steels in a wide range of environments

This work considers fourteen weathering steels manufactured by adding Cu, Cr and Ni alloying elements to extra mild steel. The steels were exposed for up to 5 years in different atmospheres. The atmospheric corrosion resistance of the steels was evaluated and the rust layers formed were characterised by X-ray diffraction, optical microscopy and scanning electron microscopy. The addition of Ni, particularly at 3.0 wt%, leads to a notable increase in corrosion resistance. The rusts formed contain lepidocrocite, goethite and spinel phases. X-ray diffraction also detected small amounts of kornelite (industrial atmosphere) and akaganeite (marine atmosphere)

Projeto e construção de uma extrusora de argila para impressão 3d

he objective of this research was to design and build a clay extruder for 3d printing, in response and as an alternative to the high costs presented by conventional materials (PLA, ABS). With this, the field of action of 3d printing would expand to other sectors of industry and crafts. The development of this article was divided into three phases: alternatives of mechanical systems were proposed, until reaching the optimal extruder model that meets the proposed objective. With the chosen model, a CAD (Computer Aided Design) dimensioning of the structure and subsystems was carried out. Then a simulation is carried out in CAE (Computer Aided Engineering) in order to find the critics of the extrusion process and finally the construction of the prototype is carried out.Two performance tests were carried out, one of semiautomatic control (manual nozzle displacement and controlled extrusion) and the other completely controlled with which the fulfillment of the functional and economic expectations was verified, reaching extrude a defined volume of material, however, it is impractical for the manufacture of large volume parts since it does not have a continuous material feed.El objetivo de esta investigación fue diseñar y construir un extrusor de arcilla para impresión 3d, en respuesta y como alternativa a los altos costos que presentan los materiales convencionales (PLA, ABS). Con esto se ampliaría el campo de acción de la impresión 3d hacia otros sectores de la industria y la artesanía. El desarrollo de este artículo se dividió en tres fases: se plantearon alternativas de sistemas mecánicos, hasta llegar al modelo óptimo de extrusor que cumpla el objetivo propuesto. Con el modelo elegido se realizó un dimensionamiento en CAD (dibujo asistido por computadora) de la estructura y subsistemas. Después se realiza una simulación en CAE (Ingeniería asistida por computadora) a fin de encontrar los puntos críticos del proceso de extrusión y finalmente se realiza la construcción del prototipo.Se realizaron dos pruebas de funcionamiento una de control semiautomático (desplazamiento de boquilla manual y extrusión controlada) y otra completamente controlada con las cuales se comprobó el cumplimiento de las expectativas funcionales y económicas planteadas, llegando a extruir un volumen definido de material, sin embargo, resulta poco práctico para fabricación de piezas de gran volumen ya que no cuenta con alimentación continua de material.O objetivo desta pesquisa foi projetar e construir uma extrusora de argila para impressão 3d, em resposta e como alternativa aos altos custos apresentados pelos materiais convencionais (PLA, ABS). Com isso, o campo de ação da impressão 3d se expandiria para outros setores da indústria e do artesanato. O desenvolvimento deste artigo foi dividido em três fases: foram propostas alternativas de sistemas mecânicos, até chegar ao modelo de extrusora ideal que atendesse ao objetivo proposto. Com o modelo escolhido, foi realizado um dimensionamento CAD( desenho auxiliado por computador) da estrutura e subsistemas. Em seguida, é realizada uma simulação no CAE (Engenharia auxiliada por computador) para encontrar os críticos do processo de extrusão e, por fim, é realizada a construção do protótipo.Foram realizados dois testes de desempenho, um de controle semiautomático (deslocamento manual do bico e extrusão controlada) e outro completamente controlado com o qual se verificou o cumprimento das expectativas funcionais e econômicas, atingindo um volume definido de material extrudado, porém, é impraticável para a fabricação de peças de grande volume, pois não possui alimentação contínua de material

Impacts of Saharan dust intrusions on bacterial communities of the low troposphere

We have analyzed the bacterial community of a large Saharan dust event in the Iberian Peninsula and, for the frst time, we ofer new insights regarding the bacterial distribution at diferent altitudes of the lower troposphere and the replacement of the microbial airborne structure as the dust event receeds. Samples from diferent open-air altitudes (surface, 100m and 3km), were obtained onboard the National Institute for Aerospace Technology (INTA) C-212 aircrafts. Samples were collected during dust and dust-free air masses as well two weeks after the dust event. Samples related in height or time scale seems to show more similar community composition patterns compared with unrelated samples. The most abundant bacterial species during the dust event, grouped in three diferent phyla: (a) Proteobacteria: Rhizobiales, Sphingomonadales, Rhodobacterales, (b) Actinobacteria: Geodermatophilaceae; (c) Firmicutes: Bacillaceae. Most of these taxa are well known for being extremely stress-resistant. After the dust intrusion, Rhizobium was the most abundant genus, (40–90% total sequences). Samples taken during the fights carried out 15 days after the dust event were much more similar to the dust event samples compared with the remaining samples. In this case, Brevundimonas, and Methylobacterium as well as Cupriavidus and Mesorizobium were the most abundant genera