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WMNs are low-cost access networks built on cooperative routing over a backbone composed of stationary wireless routers. WMNs must deal with the highly unstable wireless medium. Therefore, the design of algorithms that consider link quality to choose the best routes are enabling routing metrics and protocols to evolve. In this work, we analyze the state of(More)
The upcoming terrestrial digital television technology brings a new class of services to traditional TV sets. A set-top box may, for example , access the Internet and send e-mail. The interactive return channel makes these new services possible. This channel allows TV viewers to interact by sending data back to the TV broadcaster. In this article, we(More)
— This paper presents the design of a plug-in for the Optimized Link State Routing (OLSR) protocol with the Expected Transmission Time (ETT) metric and experiments in an indoor testbed. The ETT metric is implemented as a plug-in, keeping portability and facilitating its deployment on operational networks. Our design identifies important implementation(More)
The Brazilian government intends to use the Digital TV technology as a vehicle of digital inclusion on underserved communities. The wireless ad hoc network is a low-cost, scalable and easy solution to implement the return channel. This work analyzes the performance of an ad hoc return channel using the wireless IEEE 802.11 technology in different Brazilian(More)
Resumo— Com o advento da transmissão digital terrestre, a TV pode atuar como um veículo de inclusão digital de custo redu-zido. Este artigo analisa a adoção de um Canal de Interatividade Ad Hoc para a provisão de interatividade aos usuários de TV digital. O canal proposto utiliza o padrão IEEE 802.11 em modo ad hoc e atendè as características geográficas e(More)
Wireless mesh networks employ a backbone composed by wireless routers usually fixed. These routers extend the coverage area of access points and guarantee network connectivity. In wireless mesh networks, the traditional used metric, number of hops, is not suitable, because of high error rates and variable link quality. Thus, new routing metrics are needed(More)
Liver cirrhosis leads to a protido-synthetic impairment that alters the levels of blood clotting factors and haemostasis. The aim of this study was to assess the alterations of haemostatic parameters in the evolution of liver cirrhosis scored according to Child's classification, with Pugh's modifications. Thirty-seven patients suffering from alcoholic and(More)
This work analyzes the capacity of the ad hoc return channel using the wireless IEEE 802.11 technology in different Brazilian geographical scenarios. We conclude that when the number of transmitting nodes increases, the aggre-gated throughput can achieve 3.5 Mbps before saturation. These results prove that the ad hoc network is a viable solution for the(More)
We describe an analytical protocol for characterizing the molecular structure of hemoglobin (Hb) Lepore variants by using two different mass-spectrometric approaches. The first method consists of direct examination of the chromatographically separated hybrid globins by electro-spray mass spectrometry; the variant Lepore globin is identified through the(More)