Sistemas de recomendação de filtragem colaborativa encontram diversos desafios para alcançar acuradas recomendações. Um deles é o denominado cold-start de item que é o fato do sistema não ser capaz de recomendar itens que nunca foram avaliados por outros usuários. Neste artigo apresentamos uma proposta para minimizar esse problema, o XPrefRec. Trata-se de um sistema de recomendação híbrido, seg...

n this issue of Circulation: Cardiovascular Quality and Outcomes, Xu et al present findings from a search of US patents related to bare-metal coronary stents in an effort to gain insight on how medical device innovation starts and how policies in the United States might help to promote more innovation. 1 Of the 245 patents identified by their search strategy for the years 1984 to 1994, the auth...

The performance of many networking protocols is dependent on a handful of tuning parameters. However, it is not obvious how to set or adapt these parameters to optimize performance. We believe that this optimization task can benefit from passive monitoring of current network performance. In this paper, we apply this methodology for initializing TCP parameters, such as initial congestion window ...