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Formação de professores de matemática para o uso pedagógico de planilhas eletrônicas de cálculo: análise de um curso a distância via Internet.
(Universidade Federal de São Carlos, 2003-05-30) Morgado, Maria José Lenharo; Tancredi, Regina Maria Simões Puccinelli
This study aimed at describing and analyzing the process of the formation of Mathematics teachers of the primary and secondary levels of education who participated of a distance learning course via Internet about the pedagogical use of calculus spreadsheets. The course was then elaborated, implemented and analyzed in its characteristics, which included the use of tools of the Web and of the calculus spreadsheet, as well as the interaction between teachers-students and the coordinator. The study also presented and analyzed the difficulties and facilities faced by participants in the development of the mathematical, pedagogical and computational contents that were part both of the activities proposed in the course modules and of the activities created by the participants themselves. Special attention was given to the evaluation of the methodological strategies employed by the coordinator so that teachers-students could acquire such types of knowledge. Questionnaires applied in the beginning and at the end of the course were used to identify categories of responses of teachers that indicated changes in their attitude related to teaching, learning and classroom practice issues. The study has a predominantly qualitative nature even though the numeric data give support to the analyses, which were based in multiple objective facts, in feelings demonstrated and reports given by the teachers. Among results, it should be highlighted the verification of a low level of communication with the coordinator. In addition, a gain of mathematical, pedagogical and computational knowledge was observed among the participants, with an emphasis on the pedagogical one, in sight that this was the most difficult and workful of all courses. According to the teachers, the interaction student-coordinator and student-materials contributed a lot to the gains just mentioned. It was observed that the active participation of the teachers in the distance course was strongly influenced by their experience with the use of computers, by the use of compatible and potent equipment both at home and at school. It was verified that the lack of time together with constant professional changes are the main factors interfering in teachers permanence and participation in distance courses. Finally, this study presents some recommendations about distance education in relation to the improvement of the Web environment as well as concerning the implementation of public policies related to the continued formation of teachers.
Projeto de um servidor de vídeo sob demanda paralelo e distribuído
(Universidade Federal de São Carlos, 2003-05-30) Lara, Carla Rodrigues Figueiredo; Guardia, Hélio Crestana; https://lattes.cnpq.br/1780902767520967
This work presents an architecture for the development of a Video on Demand (Vod) Server using a Parallel Distributed File System. In the development of this work several aspects related to the project of VoD Servers are considered, including: optimized storing and retrieval of videos using appropriate striping unit and request sizes, and the monitoring of disk and network operation for the performance evaluation of the proposed system. The characteristics of the MPEG standard used for video compression are also studied and considered in the video transfers. We also discuss aspects related to the implementation of prefetching mechanisms in the VoD Server. The concept of cluster computing is also considered for efficient data distribution aiming at appropriate response time for satisfying the Quality of Service (QoS) require by the VoD users.
Reconstrução 3D de imagens tomográficas de raios-x de arcos coronais em ambiente paralelo
(Universidade Federal de São Carlos, 2003-05-30) Faria, Lilian Nogueira de; Mascarenhas, Nelson Delfino d'Ávila; https://lattes.cnpq.br/0557976975338451
Space researches have been carried with the objective to forecast solar explosions, through images obtained by satellites equipped with X-ray telescopes. The highresolution solar images allow the study of the spatio-temporal dynamics of plasmamagnetic structures in arc shape, denominated coronal loops. The coronal loops can provide important information about the solar explosions dynamics that may cause serious perturbations in terrestrial communication systems. However, this information is subject to errors due to the spatial limitation imposed by bidimensional images. Motivated by the need to extract information of the tridimensional structure of the coronal loops, a method for 3D reconstruction of coronal loops from two X-ray tomographic images captured by the Japanese satellite Yohkoh was developed. This method of 3D reconstruction based on image morphing generates the intermediate images of the transversal sections of the loop using a image warping method controlled by a Bezier curve and an approach to Image 3D Interpolation using Bayesian Estimation Theory. Due to the need for the 3D reconstruction of the coronal loops in a reasonable time for study of the spatiotemporal dynamics, a parallel program was implemented to execute in a high performance parallel machine.