Standard 802 11
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Flexibilidade de ambiente educacional através de uma rede wireless pardão IEEE 802.11
The administration of educational resources in educational institutions has become a logistical problem by increasing the demand for use of rooms, for lectures and laboratories, for practical classes with computing resources. This work presents a study for the design and implementation of a standard IEEE 802.11 wireless network in the educational environment
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/09/2010
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2. Benefícios do padrão IEEE 802.11e para tráfego de tempo real em redes WLAN não estruturadas. / Benefits of IEEE 802.11e Standard for real-time traffic in WLAN ad hoc networks.
The use of wirelles networks in most various sectors has been growing drastically in past years Allied to the wireless networks use, the diversification of applications and services provided can be directly verified whether by home or corporate users. This alliance contributes significantly to the needs of technology development which offer the quality of se
Publicado em: 2009
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3. Análise de desempenho de estratégias de retransmissão para o mecanismo HCCA do padrão de redes sem fio IEEE 802.11e
This paper presents the performanee analysis of traffie retransmission algorithms proposed to the HCCA medium aeeess meehanism of IEEE 802.11 e standard applied to industrial environmen1. Due to the nature of this kind of environment, whieh has eleetromagnetic interferenee, and the wireless medium of IEEE 802.11 standard, suseeptible to such interferenee, pl
Publicado em: 2009
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4. 3D routing with context awareness
The emergence of low-cost, wireless network interfaces in the market and the ever increasing growth in demand of mobile devices (such as SmartPhones, PDAs, Internet Tablets and Laptops) enabled scenarios where network services for mobile users may exist in an ad hoc fashion, with no pre-existing communications infrastructure. However, the creation of such dy
Publicado em: 2009
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5. MOBILE BROADBAND IEEE 802.16E-2005 SYSTEMS PLANNING FOR FREQUENCIES BETWEEN 2 AND 11 GHZ / PLANEJAMENTO DE SISTEMAS MÓVEIS EM BANDA LARGA IEEE 802.16E-2005 EM FREQÜÊNCIAS ENTRE 2 E 11 GHZ
The design of mobile broadband systems requires detailed planning due to necessity of maximizing the use of available bandwidth, network capacity, achieve minimum availability levels and minimize network implementation and operational costs. This work presents a design methodology to be employed in mobile broadband systems based on the IEEE Std 802.16-2005 (
Publicado em: 2008
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6. Caracterização da distribuição de Weibull em ambientes indoor / Characterization of the Weibull distribution in Indoor environments
The literature describes the fast flat fading propagation model in mobile environment as a Rayleigh distribution with different standard deviations which considers only one parameter to describe the channel fading. In the Weibull distribution there are two parameters to be modeled: shape factor and scale factor. The Rayleigh distribution is a particular case
Publicado em: 2008
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7. Análise do desempenho de WLAN com a implementação dos protocolos de segurança WEP e WPA/TKIP / Performance analysis of WLAN with the implementation of WEP and WPA/TKIP security protocols
Nowadays, the use of the wireless network technology has grown mainly motivated by the price of equipments, ease of installation, network maintenance and expansion of technical safety. The more you use the wireless network resource, the better should be the treatment related to its safety aspect. As the security level increases, the amount of information tra
Publicado em: 2008
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8. WLAN 802.11 anomaly mitigation using SNR to control backoff contention window / Minimização do efeito de anomalia em redes IEEE 802.11 usando SNR para controlar o CW
Ethernet exists more than 20 years and the wireless Ethernet, known as IEEE 802.11, for more than seven years. Extensions of the original standard, as IEEE 802.11g, are been created to guarantee higher transmission rates. However, some conditions there are that affect the performance of the network. One of them, known as Performance Anomaly, occurs when in a
Publicado em: 2007
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9. Análise de segurança de esquemas de privacidade de dados
This dissertation walks through the Advantage Function Model, from Goldwasser and Bellare, explaining its complex concepts and exemplifying its application in the analysis of encryption security schemes currently used in practice. It is also shown ways to put this model into practice. The safety of the schemes used in the IEEE 802.11 Standard are explained a
Publicado em: 2007
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10. AnÃlise de seguranÃa de esquemas de privacidade de dados
This dissertation walks through the Advantage Function Model, from Goldwasser and Bellare, explaining its complex concepts and exemplifying its application in the analysis of encryption security schemes currently used in practice. It is also shown ways to put this model into practice. The safety of the schemes used in the IEEE 802.11 Standard are explained a
Publicado em: 2007
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11. MOTION ESTIMATION METHOD WITH SUBPIXEL RESOLUTION OF CODEC H264/AVC / MÉTODOS DE ESTIMAÇÃO DE MOVIMENTO COM RESOLUÇÃO EM SUBPIXEL NO CODEC H264/AVC
The MPEG (Moving Picture Experts Group) and the VCEG (Video Coding Experts Group) have developed a new video compression standard entitled AVC (Advanced Video Coding). This standard offers the capacity of video compression greater than the previous standards.The motion estimation which is a phase of the video compression is extremely computer-intensive and t
Publicado em: 2007
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12. Anemia em crianças e mães de creches públicas de Natividade (RJ): prevalência, fatores de risco e validade do exame clínico palidez palmar.
Descriptive study of a transversal cut, carried out between October 2006 and December 2006, to determine global prevalence and age group in anemic children enrolled in registered Day Care Centers and the evaluations of the risk factors. The same evaluations for the prevalence of anemia was also preformed in the respective biological mothers and evaluated the
Publicado em: 2007