Preconceitos étnico-raciais apresentados por alunos dos cursos integrados do Instituto Federal de Educação, Ciência e Tecnologia : perspectivas de mudanças

Questões relacionadas à discriminação racial e educação tem sido objeto de um número crescente de publicações e estudos, favorecendo a abertura de espaços para discussões e busca de alternativas para minimizar o preconceito étnico-racial nas escolas. Desse modo, partindo-se da convicção de que o preconceito, usualmente incorporado e acreditado, é a mola central e o reprodutor mais eficaz da discriminação e de exclusão, o presente estudo teve como principal objetivo investigar junto aos alunos dos cursos integrados do IFS – Campus Aracaju- a atribuição de algumas características positivas ou negativas a pessoas com base nos estereótipos raciais, a fim de se orientar práticas pedagógicas docentes na superação de preconceitos e construção de valores. Utilizouse, neste trabalho, a abordagem de pesquisa de natureza qualitativa e quantitativa, com orientação bibliográfica, tendo o questionário como instrumento para coleta e análise de dados. Participaram da pesquisa 205 alunos, dos quais 85 (41,46%) são do sexo feminino, com idade variando entre 14 e 19 anos (Média= 16,04), e 120 (58,54%) do sexo masculino, estes apresentando idades situadas entre 14 e 21 anos (Média= 16,26), discentes dos Cursos Técnicos em Química, Eletrotécnica, Edificação, Informática e Eletrônica. Os resultados apontam que, na vivência do ambiente escolar, podem ser percebidos os mesmos preconceitos que prevalecem na sociedade, de onde se conclui que é necessária a adoção de novos métodos didáticos e práticas docentes que contemplem, com efetividade, esta problemática, de modo a fomentar a construção de uma sociedade menos desigual.

Simplifying Bode's maximum available feedback design

Bode's method for obtaining 'maximum obtainable feedback' is a good example of a nontrivial feedback system design technique, but it is largely overlooked. This paper shows how the associated mathematics can be simplified and linear elements used in its implementation, so as to make it accessible for teaching to undergraduates.

A bridge-ship collision avoidance system based on FLIR image sequences

In this paper, a forward-looking infrared (FLIR) video surveillance system is presented for collision avoidance of moving ships to bridge piers. An image preprocessing algorithm is proposed to reduce clutter background by multi-scale fractal analysis, in which the blanket method is used for fractal feature computation. Then, the moving ship detection algorithm is developed from image differentials of the fractal feature in the region of surveillance between regularly interval frames. When the moving ships are detected in region of surveillance, the device for safety alert is triggered. Experimental results have shown that the approach is feasible and effective. It has achieved real-time and reliable alert to avoid collisions of moving ships to bridge piers.

Reduced-order modelling of a high-voltage oscillatory impulse generator

The design of high-voltage equipment encompasses the study of oscillatory surges caused by transients such as those produced by switching. By obtaining a model, the response of which reconstructs that observed in the actual system, simulation studies and critical tests can be carried out on the model rather than on the equipment itself. In this paper, methods for the construction of simplified models are described and it is shown how the use of a complex model does not necessarily result in superior response pattern reconstruction.

Expert system aid for design of overload line distribution networks

The use of expert system techniques in power distribution system design is examined. The selection and siting of equipment on overhead line networks is chosen for investigation as the use of equipment such as auto-reclosers, etc., represents a substantial investment and has a significant effect on the reliability of the system. Through past experience with both equipment and network operations, most decisions in selection and siting of this equipment are made intuitively, following certain general guidelines or rules of thumb. This heuristic nature of the problem lends itself to solution using an expert system approach. A prototype has been developed and is currently under evaluation in the industry. Results so far have demonstrated both the feasibility and benefits of the expert system as a design aid.