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Q1185292
Redes de Computadores
Para interligar dois dispositivos por tecnologia cabeada, a uma distância de 1km, sem o uso de repetidores, deve-se utilizar a seguinte especificação/padrão:
Q1184935
Redes de Computadores
Julgue o próximo item, a respeito de redes de comunicação sem fio.
Para evitar colisões de pacotes, o remetente envia ao AP uma mensagem em que informa o tempo de transmissão e o tamanho do pacote; quando o AP retornar à solicitação de transmissão, o remetente poderá iniciar a transmissão.
Para evitar colisões de pacotes, o remetente envia ao AP uma mensagem em que informa o tempo de transmissão e o tamanho do pacote; quando o AP retornar à solicitação de transmissão, o remetente poderá iniciar a transmissão.
Q1184771
Redes de Computadores
Julgue o próximo item, a respeito de redes de comunicação sem fio.
Se, na conexão à Internet por meio de uma rede wi-fi, um computador localiza diversos access points (AP), então, para que seja possível entrar na rede, será necessário acessar uma sub-rede específica, contudo todas as demais redes fornecem dados para agilizar o acesso.
Se, na conexão à Internet por meio de uma rede wi-fi, um computador localiza diversos access points (AP), então, para que seja possível entrar na rede, será necessário acessar uma sub-rede específica, contudo todas as demais redes fornecem dados para agilizar o acesso.
Q1183312
Inglês
Science News
New Research Advances Voice Security Technology
ScienceDaily (Mar. 11, 2010) — Most people are familiar with security technology that scans a person's handprint or eye for identification purposes. Now, thanks in part to research from North Carolina State University, we are closer to practical technology that can test someone's voice to confirm their identity. "The big picture is speaker authentication by computer," says Dr. Robert Rodman, professor of computer science at NC State and co-author of a new paper on the subject. "The acoustic parameters of the voice are affected by the shape of the vocal tract, and different people have different vocal tracts," Rodman explains. "This new research will help improve the speed of speech authentication, without sacrificing accuracy."
Rodman explains that speech authentication could have a host of applications in this age of heightened security and mobile electronics. "Potential users of this technology include government, financial, health-care and telecommunications industries," Rodman says, "for applications ranging from preventing ID theft and fraud to data protection."
Current computer models that are used to compare acoustic profiles, effectively evaluating whether a speaker is who he says he is, may take several seconds or more to process the information, which is still too long for the technology to gain widespread acceptance. "In order for this technology to gain traction among users," Rodman says, "the response time needs to improve without increasing the error rate."
To address this problem, Rodman and his fellow researchers modified existing computer models to streamline the authentication process so that it operates more efficiently. "This is part of the evolution of speech authentication software," Rodman says, "and it moves us closer to making this technology a practical, secure tool."
The research was co-authored by NC State's Rodman; Rahim Saeidi, Tomi Kinnunen and Pasi Franti of the University of Joensuu in Finland; and Hamid Reza Sadegh Mohammadi of the Iranian Academic Center for Education, Culture & Research.
The research, "Joint Frame and Gaussian Selection for Text Independent Speaker Verification", will be presented at the International Conference on Acoustics, Speech and Signal Processing (ICASSP) in Dallas, March 14-19. The research was funded, in part, by the Centre for International Mobility.
NC State's Department of Computer Science is part of the university's College of Engineering.
http://www.sciencedaily.com/releases/2010/03/100308102202.htm
“Current computer models […] may take several seconds or more to process the information, which is still too long for the technology to gain widespread acceptance.”
In this sentence, the relative pronoun which refers to the
New Research Advances Voice Security Technology
ScienceDaily (Mar. 11, 2010) — Most people are familiar with security technology that scans a person's handprint or eye for identification purposes. Now, thanks in part to research from North Carolina State University, we are closer to practical technology that can test someone's voice to confirm their identity. "The big picture is speaker authentication by computer," says Dr. Robert Rodman, professor of computer science at NC State and co-author of a new paper on the subject. "The acoustic parameters of the voice are affected by the shape of the vocal tract, and different people have different vocal tracts," Rodman explains. "This new research will help improve the speed of speech authentication, without sacrificing accuracy."
Rodman explains that speech authentication could have a host of applications in this age of heightened security and mobile electronics. "Potential users of this technology include government, financial, health-care and telecommunications industries," Rodman says, "for applications ranging from preventing ID theft and fraud to data protection."
Current computer models that are used to compare acoustic profiles, effectively evaluating whether a speaker is who he says he is, may take several seconds or more to process the information, which is still too long for the technology to gain widespread acceptance. "In order for this technology to gain traction among users," Rodman says, "the response time needs to improve without increasing the error rate."
To address this problem, Rodman and his fellow researchers modified existing computer models to streamline the authentication process so that it operates more efficiently. "This is part of the evolution of speech authentication software," Rodman says, "and it moves us closer to making this technology a practical, secure tool."
The research was co-authored by NC State's Rodman; Rahim Saeidi, Tomi Kinnunen and Pasi Franti of the University of Joensuu in Finland; and Hamid Reza Sadegh Mohammadi of the Iranian Academic Center for Education, Culture & Research.
The research, "Joint Frame and Gaussian Selection for Text Independent Speaker Verification", will be presented at the International Conference on Acoustics, Speech and Signal Processing (ICASSP) in Dallas, March 14-19. The research was funded, in part, by the Centre for International Mobility.
NC State's Department of Computer Science is part of the university's College of Engineering.
http://www.sciencedaily.com/releases/2010/03/100308102202.htm
“Current computer models […] may take several seconds or more to process the information, which is still too long for the technology to gain widespread acceptance.”
In this sentence, the relative pronoun which refers to the
Q1182104
Algoritmos e Estrutura de Dados
Os algoritmos de ordenação são utilizados para os mais diversos cenários de dados. Apesar de terem o mesmo objetivo (ordenação), possuem diferentes complexidades em relação ao número (n) de elementos a serem ordenados. O “quiksort” se destaca como um dos algoritmos mais rápidos para ordenação. No pior caso, a complexidade “quicksort” será:
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