Neste trabalho são estudados alguns tópicos referentes a terminais de computadores com enfoque especial nos terminais de vídeo, sendo descrito, também, um projeto de terminal alfanumérico e gráfico. O terminal alfanumérico apresenta na tela, 25 linhas, cada uma com 80 caracteres e é construído a partir de somente 22 intesrados cabendo completamente numa placa S-100 padrão. O terminal gráfico, totalmente desenvolvido pelo autor no Laboratório de Instrumentação Eletrônica do DFCM, apresenta uma resolução de 512 por 250 pontos (128000 pontos) e pode ser expandido até ser capaz de mostras na tela, 256 níveis de intensidade ou cor. No sistema mínimo, o terminal necessita de apenas duas placas do padrão S-100. A filosofia aqui é o mapeamento de bits, ou seja, todas as informações dos 128000 pontos são armazenados numa memória. Tanto o terminal alfanumérico quanto o gráfico apresentam imagens através da varredura por rastro. / In this work, some topics concernins computer terminals are studied, specially focusins on video ones and a project of an alphanumeric and graphical terminal is described. The alphanumeric terminal presents 25 lines of 80 characters each, is made of only 22 intesrated circuits, beins completely contained within a standard S-100 board. The graphic terminal, totally projected by the author in the Laboratório de Instrumentação Eletrônica, has a resolution of 512 by 250 dots (128000 dots) and can be expanded up to 256 levels of intensity or 256 different colors per dot. The minimum system occupies only 2 standard 8-100 boards. The operatins principle is bit-mapped, i.e., all 128000 dots are stored in a memory. Both the alphanumeric and the graphic terminals display the memory images by raster scanning.

This thesis describes the design and the implementation of a monitor for low-speed remote terminals. The basic features of the monitor are: -terminal users have access to a library of programs, -all communication with the terminals is handled by the monitor, -any program executing in the computer can communicate with a terminal via the monitor, -programs which are communicating with the terminals are transferred to backing storage when they are not active. This allows different programs to use the same memory area during their execution.

Thesis (Ph.D.)--University of Wisconsin-Madison, 1999. / Includes bibliographical references (leaves 226-234).

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 40-41).

Neste trabalho são estudados alguns tópicos referentes a terminais de computadores com enfoque especial nos terminais de vídeo, sendo descrito, também, um projeto de terminal alfanumérico e gráfico. O terminal alfanumérico apresenta na tela, 25 linhas, cada uma com 80 caracteres e é construído a partir de somente 22 intesrados cabendo completamente numa placa S-100 padrão. O terminal gráfico, totalmente desenvolvido pelo autor no Laboratório de Instrumentação Eletrônica do DFCM, apresenta uma resolução de 512 por 250 pontos (128000 pontos) e pode ser expandido até ser capaz de mostras na tela, 256 níveis de intensidade ou cor. No sistema mínimo, o terminal necessita de apenas duas placas do padrão S-100. A filosofia aqui é o mapeamento de bits, ou seja, todas as informações dos 128000 pontos são armazenados numa memória. Tanto o terminal alfanumérico quanto o gráfico apresentam imagens através da varredura por rastro. / In this work, some topics concernins computer terminals are studied, specially focusins on video ones and a project of an alphanumeric and graphical terminal is described. The alphanumeric terminal presents 25 lines of 80 characters each, is made of only 22 intesrated circuits, beins completely contained within a standard S-100 board. The graphic terminal, totally projected by the author in the Laboratório de Instrumentação Eletrônica, has a resolution of 512 by 250 dots (128000 dots) and can be expanded up to 256 levels of intensity or 256 different colors per dot. The minimum system occupies only 2 standard 8-100 boards. The operatins principle is bit-mapped, i.e., all 128000 dots are stored in a memory. Both the alphanumeric and the graphic terminals display the memory images by raster scanning.

We propose a novel medium access control scheme which borrows ideas from the dual busy tone approach and the IEEE 802.11e standard for improving quality of services in wireless networks. In the field of medium access control in Wireless LAN, there are two notorious problems, which have been studied for a long time. They are the hidden terminal problem and the exposed terminal problem. To avoid the collisions caused by hidden terminals, the RTS/CTS approach is widely adopted. However, RTS and CTS frames themselves are still subject to collisions. The Transmit Busy Tone and the Receive Busy Tone were proposed to further mitigate the hidden terminal problem and the exposed terminal problem. The transmit busy tone provides protection for the RTS packets and thus, increase the probability of successful RTS reception at the intended receiver. The receive busy tone acknowledges the RTS packet and provide continuous protection for the subsequent data packets. We use computer simulations to justify the usage of our proposal. We show that the proposed scheme outperforms the IEEE 802.11e standard.

Thesis (M. Arch.)--University of Hong Kong, 1999. / Includes special report study entitled: Heaven on earth. Includes bibliographical references.

There is no abstract available for this dissertation.

Thesis (M. Sc.) (Hons.)--University of Western Sydney, Hawkesbury, 1994. / Includes bibliographical references (p. 279-289).

Thesis (Ph.D.)--University of California, San Francisco, 2004. / Bibliography: leaves 453-484. Also available online.