Browsing by Issue Date, starting with "2017-06"
Now showing 1 - 10 of 78
Results Per Page
Sort Options
- Libros multisensoriales como estrategia de aprendizaje para mejorar la adquisición de las nociones de cantidad y conjuntos en niños con necesidades educativas especiales.Publication . Sacán, Johanna; Tufiño, Mariela; Paucar, Sandra; Sousa, Célia; Vicente, LuísLa presente investigación está dirigida al análisis de la utilización de libros multisensoriales como estrategia de aprendizaje para mejorar la adquisición de las Nociones de Cantidad y Conjuntos en niños de 4 a 5 años con necesidades educativas especiales, esta investigación alcanza relevancia al considerar el planteamiento del problema, donde se da a conocer las falencias que se presenta en el desarrollo de dichas nociones frente a la utilización de un material didáctico poli funcional dejando de lado las necesidades y formas de aprendizaje que presentan los niños. A través de la aplicación de una guía de observación, una encuesta y una ficha de observación se pudo determinar que los cuentos multisensoriales son de vital importancia para trabajar las Nociones de Cantidad y Conjuntos, tomando en cuenta que para llegar a esta noción se debe trabajar ciertas operaciones básicas del pensamiento, que juegan un papel importante y deben ser abordadas a esta edad, tales como: clasificación, seriación, correspondencia, conservación de la cantidad, entre otros y el trabajar con niños con necesidades educativas especiales se transforma el trabajo de enseñar en un reto para el docente. Gracias al empleo de material multisensorial las operaciones lógico matemáticas resultan más sencillas al momento de enseñar y aprender creando ambientes de aprendizaje significativos. Finalmente se puede mencionar que los libros multisensoriales, son una estrategia útil tanto para el docente como para los niños, permitiendo incluir e integrar a los niños con necesidades educativas especiales, desarrollando en ellos la afectividad, la socialización, pero sobre todo despertando el interés por la matemática.
- Eigenfunctions and fundamental solutions of the fractional Laplace and Dirac operators using Caputo derivativesPublication . Ferreira, Milton; Vieira, Nelson Felipe LoureiroIn this paper we study eigenfunctions and fundamental solutions for the three parameter fractional Laplace operator ${}^C\!\Delta_+^{(\alpha,\beta,\gamma)}:= {}^C\!D_{x_0^+}^{1+\alpha} +{}^C\!D_{y_0^+}^{1+\beta} +{}^C\!D_{z_0^+}^{1+\gamma},$ where $(\alpha, \beta, \gamma) \in \,]0,1]^3$ and the fractional derivatives ${}^C\!D_{x_0^+}^{1+\alpha}$, ${}^C\!D_{y_0^+}^{1+\beta}$, ${}^C\!D_{z_0^+}^{1+\gamma}$ are in the Caputo sense. Applying integral transform methods we describe a complete family of eigenfunctions and fundamental solutions of the operator ${}^C\!\Delta_+^{(\alpha,\beta,\gamma)}$ in classes of functions admitting a summable fractional derivative. The solutions are expressed using the Mittag-Leffler function. From the family of fundamental solutions obtained we deduce a family of fundamental solutions of the corresponding fractional Dirac operator, which factorizes the fractional Laplace operator introduced in this paper.
- Aplicação das dimensões culturais do projeto Globe na avaliação da liderança ética: um estudo intercultural em Portugal e Guiné-BissauPublication . Ferreira, Manuel Portugal; Mané, Mamadú Aua; Almeida, Martinho RibeiroNeste artigo foi avaliado como as características culturais nacionais influenciam as percepções de liderança ética. Metodologicamente, foi realizado um estudo empírico relacionando as nove dimensões culturais do projeto GLOBE – Distância ao poder, Aversão à incerteza, Igualitarismo de gênero, Coletivismo de grupo/coletivismo institucional, Orientação para o desempenho, Orientação para o futuro, Orientação humana e Assertividade - com liderança ética. A amostra consistiu em 216 estudantes de Administração: 138 em Portugal e 78 na Guiné-Bissau As análises, usando um modelo estrutural, visaram identificar diferenças entre os países, observando como cada uma das nove dimensões culturais se associa à percepção de comportamentos de liderança ética. Num contexto mundial, em que surgem diversas referências às práticas éticas das empresas, este estudo contribui para alargar o debate das práticas éticas, além da forma como a liderança é exercida. O estudo contribui para entender melhor como caraterísticas culturais podem promover ou dificultar a liderança ética nas organizações. Adicionalmente, foca em dois países menos estudados, e explora a dimensão de liderança ética, que é ainda incipientemente entendida, mas que pode
- Libro multiformato: una propuesta de innovaciòn para la educaciòn inclusivaPublication . Chuquimarca, Daysi; Sousa, Célia; Vicente, LuísLa educación en el siglo XXI cambia constantemente adecuando los sistemas educativos a las necesidades de los estudiantes desde varias perspectivas; el artículo se fundamenta en una propuesta de innovación para la educación inclusiva, con la adaptación de textos del Ministerio de Educación del Ecuador en libros multiformatos que atiendan a la diversidad de comunicación y aprendizajes en el aula; implementando materiales pedagógicos concretos que apoyen la práctica docente. El proceso contiene dos fases la primera se refiere a la experiencia adquirida en el Centro de Recursos para la Inclusión Digital ubicada en el Instituto Politécnico de Leiria en Portugal. Este centro fue creado para el desarrollo de metodologías, técnicas y productos que contribuyan al desarrollo de la comunidad e intervención de la sociedad para mejorar las condiciones de vida con acciones holísticas e integradoras; una de ellas fue la elaboración de libros multiformatos para que sean implementadas en el sistema educativo del Ecuador. En la segunda fase se realiza una prueba de aplicabilidad, desde la percepción de los docentes que trabajan en escuelas fiscales del Ecuador en base a su experiencia e identificando la mejora que producen los libros multiformatos en el sistema educativo actual. Se utilizó una metodología deductiva-inductiva con un enfoque cualitativo.
- Determinants of academic performance of student-workers in higher educationPublication . Lopes, Ana Sofia; Carreira, PedroAlthough in recent years access to higher education in Portugal has expanded, there are still some people who interrupt their academic progression and enter the labour market not because of lack of skills but because of monetary constraints. Thus, returning to school is considered of great importance to mitigate this discrimination and reinforce workers’ qualification. Even though the determinants of academic performance have been deeply studied, the different characteristics, the lack of time and the multiple motivations of student-workers justify them to receive an independent treatment. Therefore, based on an extended set of observed attributes, which account for individual, degree and, for the first time to our knowledge, job characteristics, we develop two regression models to find the main determinants of the academic performance (measured by the final grade point average and by the completion time) of student-workers in higher education. We use a longitudinal dataset constituted by 332 student-workers that have enrolled in an undergraduate program at Leiria Polytechnic Institute (IPLeiria) in 2008 or 2009 and have completed it until 2015. The data was obtained by matching an internal dataset of IPLeiria with data from the Ministry of Education and Science, Portugal. The results show that student-workers who finish their degrees behave similarly to the non-worker students in their academic performance, but with different determinants explaining it. Parents’ education has a negative effect on final grade whereas higher previous qualifications, peer effects, better integration and higher average grades withindegree increase academic performance. The access regime and the field of study are also relevant, as well as self-employment, job-degree relation, private/public nature of the employer, and whether or not the job is qualified. We expect that our work contributes to develop policies that improve the success of student-workers and therefore increase the participation of workers in higher education.
- Simulador de UAV para la mejora de la calidad de vida de los adultos mayoresPublication . Bustamante, Andres; Guerrero, Graciela; Rodrigues, Nuno; Pereira, AntónioEste artículo presenta el desarrollo de un simulador de realidad virtual para la gestión de un Vehículo Aéreo No Tripulado, enfocado a mejorar la calidad de vida de las personas adultas. La presente investigación ha recogido características de gestos y movimientos físicos de usuarios realizados por otras investigaciones relacionadas con el fin de estudiar la misma interacción dentro de un mundo virtual. A través de esta investigación se generó un menor número de gestos, mejorando la curva de aprendizaje del usuario sin afectar la usabilidad. La implementación siguiente utiliza una arquitectura clienteservidor, compuesta de 2 dispositivos Raspberry Pi, y un Smartphone que actúa como un servidor, la comunicación entre ellos se logró mediante el uso de la tecnología de Baja Energía Bluetooth. La inmersiva experiencia virtual se logra utilizando Unity 3D y Google VR, herramientas que permitieron el diseño y visualización de un ambiente virtual lúdico como un enfoque para promover las habilidades físicas y cognitivas como el pensamiento espacial y la coordinación mano-ojo. Al realizar maniobras a través de un circuito aéreo lleno de obstáculos, el simulador de UAV propuesto fomenta la actividad motora y mental mientras se está entreteniendo al usuario. El resultado es la mejora de la calidad de vida del usuario evitando el sedentarismo cognitivo y físico.
- Energetic system with biomass and how to mitigate associated problemsPublication . Nabais, Adelino S.; Galvao, Joao R.; Ascenso, Rita M. T.; Leitao, Sergio A.In this work we present a greenhouse case study with a new energy model based on a Biomass energy source, once it is a more profitable and sustainable energy system, but demands special safety measures. Biomass has some dangerous aspects along the process from transport, to storage until its’ use. The paper foccus on safety for equipment operation, storage of biofuels, the design of the facilities and health of the employees, in a context of primary renewable energy source of greenhouses farming systems, for intensive cultivation of flowers and vegetables for human consumption. Similarly, exposure to biologically active material (mustiness and spores) may constitute a danger to the health of those involved in handling biomass. These properties and their use determine safety conditions in handling and storage. This energy model is constituted with several proposals, both technological and energy alternatives/renewable energy, to meet the needs of electric power and heat, with the objective of increasing the competitiveness in agricultural greenhouses, in the management, financial and environmental aspects. The model was developed with the purpose of improving efficiency and sustainability, with the inclusion of sensors that allow controlling the various components of a greenhouse, with the perspective of a quick distribution in the market, increasing the economic benefits and supported on efficient and intelligent management systems energy.
- Cooperative GNSS positioning aided by road-features measurementsPublication . Conde Bento, Luis; Bonnifait, Philippe; Nunes, Urbano J.Cooperation between road users through V2X communication is a way to improve GNSS localization accuracy. When vehicles localization systems involve standalone GNSS receivers, the resulting accuracy can be affected by satellite-specific errors of several meters. This paper studies how road-features like lane marking detected by on-board cameras can be exploited to reduce absolute position errors of cooperative vehicles sharing information in real-time in a network. The algorithms considered in this work are based on a error bounded set membership strategy. In every vehicle, a set membership algorithm computes the absolute position and an estimation of the satellite-specific errors by using raw GNSS pseudoranges, lane boundary measurements and a 2D georeferenced road map which provides absolute geometric constraints. As lane-boundary measurements provide essentially cross-track corrections in the position estimation process, cooperation enables the vehicles to improve their own estimates thanks to the different orientation of the roads. Set-membership methods are very efficient to solve this problem since they do not involve any independence hypothesis of the errors and so, the same information can be used several times in the computation. Such class of algorithm provides a novel approach to improve position accuracy for connected vehicles guaranteeing the integrity of the computed solution which is pivoting for automated automotive systems requiring guaranteed safety-critical solutions. Results from simulations and real experiments show that sharing position corrections reduces significantly satellite-specific GNSS errors effects in both cross-track and along-track components. Moreover, it is shown that lane-boundary measurements help reducing estimation errors for all the networked vehicles even those which are not equipped with an embedded perception system.
- Mechanical behavior of high dosage short carbon fiber reinforced epoxy compositesPublication . Capela, C.; Oliveira, S. E.; Ferreira, J. A. M.Short fibers are effective reinforcements in strengthening and toughening polymer materials, even small amounts of fibers. However, for high fiber dosage the achieved dispersion and interface adhesion is quite poor reaching to lower stiffness and strength efficiency. In high dosage composites, the effects of the fiber length and volume fraction on mechanical properties is not entirely consensual; nonetheless this paper intends to contibute for a better understanding of this occurrence. Composite plates were manufactured by compression moulding, using short carbon fibers reinforcements (2, 4 and 6 mm in length) with 45-75 % wt fiber fraction. Tensile and dynamic mechanical analysis (DMA) specimens were machined from molded plates for the desired dimensions. DMA was performed with bi-supported specimens in temperature ranged from 20 to 180 oC. High dosage composites exhibit very low efficiency parameters both in stiffness and particularly in tensile strength. However, the stiffness increases in order of 25 % when fiber length increases from 2 mm to 4 mm, but afterwards tends to decrease for 6 mm fiber length composites. The same tendency was observed for the tensile strength. For very high fiber dosage composites, tensile strength decreases and Young’s modulus tends to remain at constant values. However, the results of DMA indicate that bending modulus storage increases when fiber length increases from 2 mm to 6 mm.
- O direito à reparação dos danos emergentes de riscos profissionaisPublication . David, Soraia Raquel Henriques; Gonçalves, Luísa Maria Freitas Gomes Andias; Mendes, Jorge Manuel BarrosA presente dissertação de mestrado propõe uma análise do direito à reparação dos danos emergentes dos riscos profissionais, em especial, dos acidentes de trabalho e doenças profissionais. Esta investigação não dispensou a análise dos diplomas que regularam esta matéria, quer no âmbito da sua prevenção, como da proteção e reparação, numa perspetiva histórico-comparativa, por forma a obter um balanço acerca da evolução do direito infortunístico, em especial, da reparação dos acidentes de trabalho e doenças profissionais. De facto, o legislador optou por regular em diploma próprio o regime de reparação de acidentes de trabalho e doenças profissionais, naquela que denominamos por Lei dos Acidentes de Trabalho, aplicável aos trabalhadores subordinados, prevendo para os acidentes de trabalho um sistema de reparação baseado na transferência da sua responsabilidade por meio de seguro privado e, quanto às doenças profissionais, a sua integração no regime geral da segurança social. Procede-se, portanto, à análise dos fundamentos do regime e dos diversos sistemas de reparação existentes, para depois se dissecarem os pressupostos do direito à reparação e os termos em que este se opera para ambos. Para tal, este estudo centra-se numa incursão pelo regime jurídico de reparação em vigor no nosso ordenamento jurídico, socorrendo-nos, sempre que necessário, dos entendimentos sufragados pela doutrina e vasta jurisprudência existente acerca desta matéria.