Integrador FIG-LATEX

Orientador : Tomasz KowaltowskiDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Ciencia da ComputaçãoResumo: TEX é um sistema de composição computadorizada de textos desenvolvido por Donald E. Knuth que apresenta excelentes resultados a.o compor textos, especialmente textos matemáticos. Com o intuito de auxiliar os usuários de TEX, Leslie Lamport desenvolveu sobre ele o sistema LATEX. Infelizmente, TEX- não dispõe de recursos gráficos e aqueles existentes em LATEX são muito restritos. Descreve-se, neste trabalho, a integração da linguagem FIG ao sistema LATEX. A partir desta integração, o usuário passa a especificar as figuras em FIG no próprio texto, no local onde deseja inseri-Ia. Tais figuras são convertidas em comandos LATEX ou PostScript. No final do processamento, obtêm-se as figuras automaticamente inseridas no texto que, então, pode ser submetido a LATEX.Abstract: TEX is a computerized typesetting system developed by Donald E. Knuth designed to handle especially well mathematical texts. Leslie Lamport's LATEX system as developed as its extension for relatively all experienced users. TEX does not indude any facilities for drawillg pictures, and those existing in LATEX are very restricted. It's described in this work the integration of the language FIG into the LATEX system wruch allows the user to place the specifications of rus drawings within the LATEX text. These specifications are automatically translated into LATEX or PostScript commands, so that the drawings are inserted into the resulting textMestradoMestre em Ciência da Computaçã

A video-based biometric authentication for e-learning web applications

In the last years there was an exponential growth in the offering of Web-enabled distance courses and in the number of enrolments in corporate and higher education using this modality. However, the lack of efficient mechanisms that assures user authentication in this sort of environment, in the system login as well as throughout his session, has been pointed out as a serious deficiency. Some studies have been led about possible biometric applications for web authentication. However, password based authentication still prevails. With the popularization of biometric enabled devices and resultant fall of prices for the collection of biometric traits, biometrics is reconsidered as a secure remote authentication form for web applications. In this work, the face recognition accuracy, captured on-line by a webcam in Internet environment, is investigated, simulating the natural interaction of a person in the context of a distance course environment. Partial results show that this technique can be successfully applied to confirm the presence of users throughout the course attendance in an educational distance course. An efficient client/server architecture is also proposed. © 2009 Springer Berlin Heidelberg