1,001 research outputs found
The State of Blogging
Presents findings from a survey of the position of blogs as a key part of online culture. Provides a profile of the typical blogger, information about the increase in readership, and methods used by readers to obtain information delivered from blogs
Emerging technologies for learning (volume 1)
Collection of 5 articles on emerging technologies and trend
The effect of technology on cable service to large, networked communities
Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2003.Includes bibliographical references (leaf 45).Delivering cable television to college and university campuses is maintained by a highly specialized industry which involves significant technological and logistical challenges. As campuses continue to contribute financial resources into improving their data networks, companies that provide campus cable services will need to offer services over data networks comparable to the existing services they offer over dedicated co-axial cable networks. This paper explores the business of providing cable services to university communities, describes the challenges these providers face and offers a glimpse into the future of IP-based desktop television.by Paul K. Harmeling.M.Eng.in Logistic
Three scenarios for TV in 2015
By offering three visions of the future of television through 2015, this article aims to highlight some of the socio-economic changes that the television sector may experience in the long term. It highlights the structuring impact that PVR could have on the sector, as well as the upheavals that may arise from a new paradigm of internet TV. It also highlights the options now open to TV channel operators wishing to set up a mobile TV service and the threats facing mobile telecommunications operators in the development of this market as a result.television; forecast; media usages
Conectividade definida por software em ambientes móveis
Broadband Internet access on trains has become an expected service for passengers,
and the rise in quality demand has been posing a challenge to service
providers. There are solutions for Internet access on trains that lack the
flexibility and redundancy needed for an improved QoS in the network. Thus,
this dissertation studies two new load balancing solutions, one distributed and
the other centralized. In an emulated train network, routers of each car communicate
their network statistics to other nodes of the network, to be used
in load balancing decisions. In the distributed solution, each router has the
capacity to make load balancing decisions, while in the centralized solution,
an onboard controller makes those decisions. The latter solution is based on
load balancing in an SDN environment. In this system, a remote entity aggregates
the passengers’ traffic and forwards it to an external network, or to the
Internet. The systems must provide an improved quality of experience to the
passengers on the train and the total avaliable bandwidth should be distributed
evenly by all cars. Requirements were established for the systems, which were
developed after an in-depth analysis of solutions for Internet access on board
found in the literature. After obtaining the results of the performance tests, it
was concluded that the systems improve the QoE of the passengers, as long
as the network conditions are approximately constant for an extended period.O acesso à Internet de banda larga em comboios tornou-se num serviço esperado
por parte dos passageiros e o aumento na exigência de qualidade tem
constituído um desafio para os prestadores de serviços. Existem soluções de
acesso à Internet em comboios que carecem da flexibilidade e redundância
necessárias para uma melhor qualidade de serviço na rede. Assim, esta
dissertação estuda duas novas soluções de balanceamento de carga, uma
distribuída e outra centralizada. Numa rede de comboio emulada, routers
de cada carruagem comunicam as suas estatísticas de rede para outros nós
da rede, para posteriormente serem tomadas decisões de balanceamento de
carga. Na solução distribuída, cada router tem capacidade de tomar decisões
de balanceamento de carga, enquanto que na solução centralizada, um controlador
dentro do comboio toma essas decisões. Esta última solução baseiase
num balanceamento de carga em ambiente SDN. Neste sistema, uma entidade
remota agrega o tráfego dos passageiros e encaminha-o para uma rede
externa, ou para a Internet. Os sistemas devem proporcionar uma qualidade
de experiência melhorada aos passageiros do comboio e a largura de banda
total disponível deve ser distribuída mais uniformememente por todas as carruagens.
Requisitos foram estabelecidos para os sistemas, que foram desenvolvidos
após uma análise aprofundada das soluções de acesso à Internet
em comboios encontradas na literatura. Após a obtenção dos resultados dos
testes de desempenho, concluiu-se que as duas soluções melhoram o QoE
dos passageiros, desde que as condições da rede sejam aproximadamente
constantes durante um certo período.Mestrado em Engenharia de Computadores e Telemátic
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