Avaliação em ambientes virtuais de aprendizagem Evaluation in virtual learning environments

A demanda por avaliações de projetos de aprendizagem virtual a distância tem requerido o emprego de conceitos e métodos que transcendem o campo exclusivo da Educação, destacando-se a multiplicidade de marcos teóricos e abordagens técnicas empregados nas estratégias avaliativas de aprendizagem online. A despeito da hegemonia dos métodos quantitativos na avaliação das tecnologias de informação e comunicação, o emprego de métodos qualitativos nas avaliações de ambientes virtuais tem crescido ao longo das duas últimas décadas. A combinação de métodos quali-quantitativos possibilita uma melhor compreensão dos fenômenos subjacentes ao uso das tecnologias para a aprendizagem online. Dado que a educação em ambientes virtuais refere-se a experiências de aprendizagem que utilizam recursos hipermidiáticos em ambientes apoiados por uma tecnologia de comunicação online, optou-se neste artigo enfocar alguns tópicos relativos à avaliação de tecnologias de informação e de aprendizagem nesses ambientes, aprofundando a discussão no que tange aos métodos relevantes à avaliação tanto dos ambientes virtuais de aprendizagem quanto da aprendizagem nesse meio. Essa opção se deve tanto ao reconhecimento das especificidades das práticas pedagógicas da EaD que colocam em evidência a relação entre educação e comunicação, viabilizadas por meio das tecnologias de informação e comunicação, quanto aos diversos papéis, negativos e positivos, atribuídos às tecnologias de comunicação e informação na Educação.<br>The demand for evaluations of projects of virtual distance learning has required the use of concepts and methods that go beyond the strictly educational field, with emphasis on the multiplicity of theoretical frameworks and technical approaches employed in the assessment strategies of online learning. Despite the hegemony of quantitative methods in the evaluation of the technologies of information and communication, the use of qualitative methods in the assessment of virtual environments has increased throughout the last decades. The combination of qualitative-quantitative methods allows a better understanding of the phenomena underlying the use of technologies for online learning. Given that education in virtual environments relates to learning experiences that make use of hypermediatic resources within environments supported by an online communication technology, we have opted in the present article for focusing on topics associated to the evaluation of information and learning technologies in these environments, furthering the discussion concerning the methods relevant to the assessment both of the virtual learning environments and of the learning within this medium. This choice is due to the recognition of the specificities of the practices of distance learning, which stress the relationship between education and communication, made possible through the new information and communication technologies. It also recognizes the various roles, positive and negative, attributed to the information and communication technologies in education

A review of morphing aircraft

Aircraft wings are a compromise that allows the aircraft to fly at a range of flight conditions, but the performance at each condition is sub-optimal. The ability of a wing surface to change its geometry during flight has interested researchers and designers over the years as this reduces the design compromises required. Morphing is short for metamorphose: however, there is neither an exact definition nor an agreement between the researchers about the type or the extent of the geometrical changes necessary to qualify an aircraft for the title “shape morphing”. Geometrical parameters that can be affected by morphing solutions can be categorized into: planform alteration (span, sweep and chord), out-of-plane transformation (twist, dihedral/gull, spanwise bending) and airfoil adjustment (camber and thickness).Changing the wing shape or geometry is not new. Historically, morphing solutions always led to penalties in terms of cost, complexity or weight, although in certain circumstances these were overcome by system level benefits. The current trend for highly efficient and “green” aircraft makes such compromises less acceptable, calling for innovative morphing designs able to provide more benefits and fewer drawbacks. Recent developments in “smart” materials may overcome the limitations and enhance the benefits from existing design solutions. The challenge is to design a structure that is capable of withstanding the prescribed loads, but is also able to change its shape: ideally there should be no distinction between the structure and the actuation system. The blending of morphing and smart structures in an integrated approach requires multi-disciplinary thinking from the early development, which significantly increases the overall complexity, even at the preliminary design stage. Morphing is a promising enabling technology for future, next generation aircraft. However, manufacturers and end users are still too skeptical of the benefits to adopt morphing in the near future. Many developed concepts have a technology readiness level that is still very low. The recent explosive growth of satellite services means that UAVs are the technology of choice for many investigations on wing morphing.This paper presents a review of the state of the art on morphing aircraft and focuses on structural, shape changing morphing concepts for both fixed and rotary wings, with particular reference to active systems. Inflatable solutions have been not considered, and skin issues and challenges are not discussed in detail. Although many interesting concepts have been synthesized, few have progressed to wing tunnel testing, and even fewer have flown. Furthermore, any successful wing morphing system must overcome the weight penalty due to the additional actuation systems.<br/