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Supercomputers
One definition for a supercomputer is “the most powerful computer available at any given time.” These machines are used to solve complex problems such as the design of a supersonic aircraft, modeling of global climates, the structure of oil-bearing formations within the Earth, the molecular design of new drugs, or the prediction of complex financial behavior in securities markets. Two of the first supercomputers were the Control Data Corporation CDC 6600 and CDC 7600. Both were developed by Seymour Cray, one of the founders of CDC. In 1972, Cray left to found Cray Research, Inc., and in 1976 developed the Cray-1, generally acknowledged to be the first true supercomputer.
The Cray-1 used high-speed emitter coupled logic (ECL), the fastest (and most power hungry) logic circuits available at the time. The computer was packaged as a 6.5 ft. high cylinder surrounded by a circular seat. Each circuit board was mounted on a copper heat exchanger through which liquid freon was circulated. The total power consumption of the computer was 128 KW! Processing speed was 130 MFLOPS (millions of floating-point operations per second). In all, 63 Cray-1 computers were sold (at a cost of $5.1 million each).
[Extraído de: The 80x86 Family, John Uffenbeck, 2nd Ed., 1998]
Considerando o contexto, o termo “heat exchanger” pode ser corretamente traduzido por
Supercomputers
One definition for a supercomputer is “the most powerful computer available at any given time.” These machines are used to solve complex problems such as the design of a supersonic aircraft, modeling of global climates, the structure of oil-bearing formations within the Earth, the molecular design of new drugs, or the prediction of complex financial behavior in securities markets. Two of the first supercomputers were the Control Data Corporation CDC 6600 and CDC 7600. Both were developed by Seymour Cray, one of the founders of CDC. In 1972, Cray left to found Cray Research, Inc., and in 1976 developed the Cray-1, generally acknowledged to be the first true supercomputer.
The Cray-1 used high-speed emitter coupled logic (ECL), the fastest (and most power hungry) logic circuits available at the time. The computer was packaged as a 6.5 ft. high cylinder surrounded by a circular seat. Each circuit board was mounted on a copper heat exchanger through which liquid freon was circulated. The total power consumption of the computer was 128 KW! Processing speed was 130 MFLOPS (millions of floating-point operations per second). In all, 63 Cray-1 computers were sold (at a cost of $5.1 million each).
[Extraído de: The 80x86 Family, John Uffenbeck, 2nd Ed., 1998]
De acordo com o texto, o computador reconhecido, de uma forma geral, como sendo o primeiro supercomputador de fato foi o
Supercomputers
One definition for a supercomputer is “the most powerful computer available at any given time.” These machines are used to solve complex problems such as the design of a supersonic aircraft, modeling of global climates, the structure of oil-bearing formations within the Earth, the molecular design of new drugs, or the prediction of complex financial behavior in securities markets. Two of the first supercomputers were the Control Data Corporation CDC 6600 and CDC 7600. Both were developed by Seymour Cray, one of the founders of CDC. In 1972, Cray left to found Cray Research, Inc., and in 1976 developed the Cray-1, generally acknowledged to be the first true supercomputer.
The Cray-1 used high-speed emitter coupled logic (ECL), the fastest (and most power hungry) logic circuits available at the time. The computer was packaged as a 6.5 ft. high cylinder surrounded by a circular seat. Each circuit board was mounted on a copper heat exchanger through which liquid freon was circulated. The total power consumption of the computer was 128 KW! Processing speed was 130 MFLOPS (millions of floating-point operations per second). In all, 63 Cray-1 computers were sold (at a cost of $5.1 million each).
[Extraído de: The 80x86 Family, John Uffenbeck, 2nd Ed., 1998]
Assinale a alternativa que apresenta um tipo de aplicação para supercomputadores NÃO mencionada no texto.
Modem control software has to test the condition of the CTS and DSR signals before transmitting information to the modem. The modem also has to be conditioned by the computer by applying a logic zero on the modem connections DTR and RTS .
If one of the two communications interface adapters discussed earlier in this chapter is used, most of the modem control is already accomplished by these devices. For example, the Intel 8251A has all four of the pin connections required for modem control, while the Motorola MC6850 contains only some of the connections.
[Extraído de: Microprocessors and Peripherals, Barry B. Brey, Maxwell Macmillan International Editions, 1991]
Considerando o seguinte trecho do texto: “most of the modem control is already accomplished by these devices”, uma tradução possível para accomplished, no contexto, é:
Modem control software has to test the condition of the CTS and DSR signals before transmitting information to the modem. The modem also has to be conditioned by the computer by applying a logic zero on the modem connections DTR and RTS .
If one of the two communications interface adapters discussed earlier in this chapter is used, most of the modem control is already accomplished by these devices. For example, the Intel 8251A has all four of the pin connections required for modem control, while the Motorola MC6850 contains only some of the connections.
[Extraído de: Microprocessors and Peripherals, Barry B. Brey, Maxwell Macmillan International Editions, 1991]
Com base no texto, necessita(m) ser verificado(s), antes de uma transmissão de informação para o modem, o(s) seguinte(s) sinal(is):
No contexto das normas de segurança do trabalho, o mapa de risco é uma representação
O coeficiente de onda estacionária (VSWR) é utilizado para avaliar o casamento de impedância em linhas de transmissão. Esse coeficiente está diretamente relacionado com o coeficiente de reflexão da linha (ᴦ). Se o coeficiente de reflexão da linha é dado por ᴦ = 0,5, o VSWR será:
À medida que o Usuário Móvel (UM) se aproxima dos limites de operação de cada célula, o sistema de telefonia móvel precisa transferir a chamada para a célula adjacente. Esse procedimento é conhecido como
Considere que um sinal de frequência máxima B Hz é modulado com a técnica de modulação AM. A condição que deve ser obedecida pelo índice de modulação m de forma que seja possível utilizar um detector de envoltória em sua demodulação é:
Um sinal com frequência máxima B Hz é modulado com a técnica AM-SSB. A banda ocupada pelo sinal modulado é
Um dos circuitos utilizados para a demodulação FM é o
Utilizando um componente da família TTL, deseja-se fazer uma lógica AND entre dois sinais digitais, utilizando-se uma porta AND de três entradas. A esse respeito, considere as seguintes ações que poderiam ser tomadas:
1. deixar a entrada não utilizada em “aberto”. 2. conectar a entrada não utilizada em GND. 3. conectar a entrada não utilizada em Vcc. Dessas possíveis ações, produzirá(ão) o resultado desejado (AND entre os dois sinais digitais) apenas as ações presentes emUma memória semicondutora do tipo RAM é especificada como sendo 2K x 8. Assinale a alternativa que apresenta o número de bits presentes nessa memória.
Considere o número positivo AE34h, expresso na base hexadecimal. Esse mesmo número apresenta, na base decimal, a representação:
Os amplificadores podem ser divididos em diversas classes, sendo que os de classe
Um Retificador Controlado de Silício (SCR) que se encontra diretamente polarizado, e cuja corrente no seu gate seja nula, estará na região de operação de
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