In-loop Feature Tracking for Structure and Motion with Out-of-core Optimization

In this paper, a novel and approach for obtaining 3D models from video sequences captured with hand-held cameras is addressed. We define a pipeline that robustly deals with different types of sequences and acquiring devices. Our system follows a divide and conquer approach: after a frame decimation that pre-conditions the input sequence, the video is split into short-length clips. This allows to parallelize the reconstruction step which translates into a reduction in the amount of computational resources required. The short length of the clips allows an intensive search for the best solution at each step of reconstruction which robustifies the system. The process of feature tracking is embedded within the reconstruction loop for each clip as opposed to other approaches. A final registration step, merges all the processed clips to the same coordinate fram

Thermal conductivity and viscosity measurements of ethylene glycol-based Al2O3 nanofluids

The dispersion and stability of nanofluids obtained by dispersing Al2O3 nanoparticles in ethylene glycol have been analyzed at several concentrations up to 25% in mass fraction. The thermal conductivity and viscosity were experimentally determined at temperatures ranging from 283.15 K to 323.15 K using an apparatus based on the hot-wire method and a rotational viscometer, respectively. It has been found that both thermal conductivity and viscosity increase with the concentration of nanoparticles, whereas when the temperature increases the viscosity diminishes and the thermal conductivity rises. Measured enhancements on thermal conductivity (up to 19%) compare well with literature values when available. New viscosity experimental data yield values more than twice larger than the base fluid. The influence of particle size on viscosity has been also studied, finding large differences that must be taken into account for any practical application. These experimental results were compared with some theoretical models, as those of Maxwell-Hamilton and Crosser for thermal conductivity and Krieger and Dougherty for viscosity

Expresión escrita y necesidades educativas especiales : una línea de investigación en psicodidáctica

En este artículo se describe una línea de investigación psicodidáctica, cuyo objetivo es evaluar las necesidades educativas especiales en la expresión escrita. En el análisis se abordan dos dimensiones fundamentales: 1)Procesos cognitivos y metacognitivos y actitudes de los alumnos; 2) Características del texto, en el nivel macro-estructural y micro-estructural. En la investigación, de carácter exploratorio y cualitativo, se plantean interrogantes fundamentales sobre el tema, cuya respuesta se aborda desde una metodología mixta, en la que se combinan técnicas de análisis cualitativo y cuantitativo. De los resultados obtenidos en la investigación derivan aplicaciones en dos campos: 1) teórico: comprensión y explicación de la expresión escrita; 2) práctico: intervención didáctica para optimizar la habilidad de escribir.En aquest article es descriu una línia d'investigació psicodidàctica, amb l'objectiu d'avaluar les necessitats educatives especials en l'expressió escrita. En l'anàlisi s'aborden dues dimensions fonamentals: 1) Processos cognitius i metacognitius i actituds dels alumnes; 2) Característiques del text, en el nivell macro-estructural i micro-estructural. En la investigació, de caràcter exploratori i qualitativa, es plantegen interrogants fonamentals sobre la temàtica d'anàlisi qualitatiu i quantitatiu. Dels resultats obtinguts en la investigació se'n deriven aplicacions en dos camps: 1) teòric: comprensió i explicació de l'expressió escrita; 2) pràctic: intervenció didàctica per optimitzar l'habilitat d'escriure.In this paper a research trend is described. It is aimed at analyzing the written composition of pupils with special educational needs. Two issues are concerned: 1) Cognitive and metacognitive processes and attitude toward writing; 2) Text structures both at macro and micro-level. Research being of exploratory and qualitative nature, in its design essential questions about written composition are posed. In the methodology it will get together qualitative techniques and quantitative analyses. Results from research can contribute to the succes of teaching: 1) validating theoretical approaches; 2) suggesting new specified goals and strategies for teaching

Tendencias en la formación inicial del profesorado en educación especial

Este artículo se inscribe en el contexto de la formación de los futuros docentes y se centra en uno de sus componentes fundamentales: la formación inicial del profesorado en educación especial. Nuestra preocupación se centra pues en los conocimientos que los futuros profesores deben adquirir, así como en la forma de desarrollar sus actuaciones didácticas para contribuir eficazmente al desarrollo integral de sus alumnos. En este artículo, después de reflexionar sobre los nuevos requerimientos en la formación inicial del profesorado, se analizan algunos dilemas (formación categorial vs. genérica, formación generalista vs. específica) que se plantean en la teoría y en la práctica de la educación especial y se postula una propuesta integradora, que deriva de la filosofía de la escuela inclusiva: los profesores generalistas y especialistas, aun desempeñando distintas funciones, deben actuar colaborativamente y, por tanto, su formación debe ser común y diferenciada

Reflexiones docentes acerca del diseño arquitectónico de los centros de formación profesional en Granada

If the specificity of the architectural space is considered as a measuring element in the education scope to value the prominence of teaching throughout history, it is worth mentioning that the configuration of the vocational training center as a first-rate education scenario that arrives half century of delay with respect to schools, has few references of very specific period. At present, they continue excessively contaminated because of the continued struggle for linking them with other education levels. This article is focused on this issue. To that end, by interviewing experienced teachers, we value: a) from the most conceptual aspect, elements and architectural spaces that should have those reference centers; b) the appropriateness of the arranged spaces, not only those that meet the regulatory requirements but those that meet the criteria of the centers; c) to the most specific aspects on the way to optimize the arranged space in order to achieve a larger curricular extent. It concludes with a high positive assessment of the opportunity of having the necessary spaces for teaching, relying more strongly on those favoring the free relationship of students and allowing the permeability among the different disciplines that converge in the center.Si se toma como medidor la especificidad del espacio arquitectónico en el ámbito educativo para valorar el protagonismo que a lo largo de la historia han tenido las enseñanzas, cabe destacar que la configuración del centro docente para la formación profesional, como escenario educativo de primer orden, que llega con medio siglo de retraso respecto a las escuelas, cuenta con escasos referentes que responden a un periodo muy concreto y que, en la actualidad, persisten excesivamente contaminados debido a la continua puja por la vinculación de estas con otros niveles educativos. Esta cuestión es la temática en la que se centra el presente artículo. Para ello, y recurriendo a la entrevista de docentes con experiencia, se valora: a) desde lo más conceptual, elementos y espacios arquitectónicos que deben caracterizar los centros de referencia; b) la pertinencia de los espacios dispuestos, tanto los que responden a requerimientos reglamentarios como a los criterios de los propios centros; c) hasta los aspectos más concretos sobre la manera de optimizar el espacio dispuesto para alcanzar una mayor amplitud curricular. Se concluye con una valoración muy positiva de la oportunidad de espacios precisos para estas enseñanzas, apostando con fuerza por aquellos que propician la libre relación del alumnado y permiten la permeabilidad entre las distintas disciplinas que convergen en el centro.Si se toma como medidor la especificidad del espacio arquitectónico en el ámbito educativo para valorar el protagonismo que a lo largo de la historia han tenido las enseñanzas, cabe destacar que la configuración del centro docente para la formación profesional, como escenario educativo de primer orden, que llega con medio siglo de retraso respecto a las escuelas, cuenta con escasos referentes que responden a un periodo muy concreto y que, en la actualidad, persisten excesivamente contaminados debido a la continua puja por la vinculación de estas con otros niveles educativos. Esta cuestión es la temática en la que se centra el presente artículo. Para ello, y recurriendo a la entrevista de docentes con experiencia, se valora: a) desde lo más conceptual, elementos y espacios arquitectónicos que deben caracterizar los centros de referencia; b) la pertinencia de los espacios dispuestos, tanto los que responden a requerimientos reglamentarios como a los criterios de los propios centros; c) hasta los aspectos más concretos sobre la manera de optimizar el espacio dispuesto para alcanzar una mayor amplitud curricular. Se concluye con una valoración muy positiva de la oportunidad de espacios precisos para estas enseñanzas, apostando con fuerza por aquellos que propician la libre relación del alumnado y permiten la permeabilidad entre las distintas disciplinas que convergen en el centro

Testing for deterministic components in vector seasonal time series

Certain locally optimal tests for deterministic components in vector time series have associated sampling distributions determined by a linear combination of Beta variates. Such distributions are nonstandard and must be tabulated by Monte Carlo simulation. In this paper, we provide closed form expressions for the mean and variance of several multivariate test statistics, moments that can be used to approximate unknown distributions. In particular, we find that the two-moment Inverse Gaussian approximation provides a simple and fast method to compute accurate quantiles and p-values in small and asymptotic samples. To illustrate the scope of this approximation we review some standard tests for deterministic trends and/or seasonal patterns in VARIMA and structural time series models

Are There Any Differences between the Texts Written by Students Who Are Blind, Those Who Are Partially Sighted, and Those with Normal Vision?

The aim was prepared in order to analyze the linguistic ability of children with visual impairment and children with normal vision. Several features of the narrative episodes produced were investigated, including quantity, quality, the connections between them and the structural elements which they consist of. Central tendency measures and dis-persion measures were applied, in addition to inferential measures. This leads us to the conclusion that the structural parts making up the texts depend on a great extent to the individual style of each subject. However, the two groups are markedly different in cer-tain parts. Finally, pupils who were older and educated to a higher level have shown greater development of narrative ability, engaging more with the essential part quite largely forgotten in the younger pupils’ texts. With regard to the connections established by the pupils between the various episodes making up their narratives, the texts produced by pupils with visual impairments show predominantly temporary connections. Significant differences were found between the texts written by students who had normal vision and those who were blind or partially sighted. The greatest differences were observed in the length of the text and the complete episodes: both measures were greater in the texts writ-ten by students with normal vision

Development of the Writing Skills of Students in Compulsory Education in Spain

Acquiring writing skills requires an entire academic lifetime but acceptable levels of proficiency should be covered in compulsory education. This research verifies the beginner, intermediate and advanced levels of writing skills in the Spanish education system. It compares both the development of knowledge and the associated difficulties in interviews with 40 students from the even years of primary and secondary education. Descriptive and correlational analyses were made, after coding their statements according to the theoretical model used. They revealed an unexpected stagnation, depending on the levels, with important educational implications.This research was financed by the Andalusian Regional Government (Spain) and the ERDF (European Regional Development Fund), Programme for STRENGTHENING R&D&I at the University of Granada

Communication skills training in trainee primary school teachers in Spain

En http://www.ise-lv.eu/ufiles/1440677166JTEFS_2015_vol%2017_no%201.pdf ; http://www.degruyter.com/view/j/jtes DOI: 10.1515/jtes-2015-0007Research on teacher training often focuses on learnersí perceptions of that training. The focus of this paper, which uses a research-to-practice approach, is instead on the views of the trainers. It evaluates the perceptions of university lecturers teaching classes as part of primary teachersí training degrees and assesses their views of the communication skills developed by their students to be used in their future careers. The study uses a 17-item ad-hoc questionnaire, completed by 152 lecturers from the University of Granada. Descriptive and inferential analyses are then carried out on the data collected using SPSS. The analysis results show how important lecturers believe it is for trainee teachers to develop communication skills, which they often lack. Although lecturers believe communication skills are very important, they also think that they are not developed as much as they should be in their classes, so trainee teachers cannot communicate as effectively as they should