Made available in DSpace on 2014-06-12T15:59:01Z (GMT). No. of bitstreams: 2 arquivo4816_1.pdf: 2799351 bytes, checksum: e24cd48b5d81ce6555331ed417d56fe2 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2003 / As interfaces gráficas, através da utilização da tecnologia de realidade virtual, possibilitam uma interação eficiente, agradável e produtiva entre o usuário e modelos cartográficos digitais. Este trabalho versa sobre a criação de modelos cartográficos digitais tridimensionais, que terão como base na entrada de dados, arquivos no formato DXF (Drawing Interchange File), formato padrão para aplicativos da área da cartografia, e produzirá arquivos da tecnologia VRML (Virtual Reality Modeling Language), tecnologia criada para Web de domínio público, sem plataforma definida e de fácil utilização. O objetivo desta proposta é criar modelos que consigam representar as informações com um grau de realismo satisfatório para o usuário e que ainda permitam uma performance agradável no descarregamento e na navegação

This study examined the differences between a 3-D, VRML search interface, similar to Cone Trees, as a front-end to Yahoo on the World Wide Web and a conventional text-based, 1-Dinterface to the same database. The study sought to determine how quickly users could find information using both interfaces, their degree of satisfaction with both search interfaces, and which interface they preferred.

In this thesis, a simulation package for the Six Degrees of Freedom (6DOF) motion of an underwater vehicle is developed. Mathematical modeling of an underwater vehicle is done and the parameters needed to write such a simulation package are obtained from an existing underwater vehicle available in the literature. Basic equations of motion are developed to simulate the motion of the underwater vehicle and the parameters needed for the hydrodynamic modeling of the vehicle is obtained from the available literature. 6DOF simulation package prepared for the underwater vehicle was developed using the MATLAB environment. S-function hierarchy is developed using the same platform with C++ programming language. With the usage of S-functions the problems related to the speed of the platform have been eliminated. The use of Sfunction hierarchy brought out the opportunity of running the simulation package on other independent platforms and get results for the simulation.