Browsing by Issue Date, starting with "2002-09"
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- "Religião", in Verbo: Enciclopédia Luso-Brasileira de CulturaPublication . Freitas, Manuel Barbosa da Costa; Morão, Artur; Rosa, José Maria SilvaA existência do fenómeno religioso e sua permanência ao longo da história, a sua unidade fundamental bem como a originalidade e inesgotabilidade de suas expressões são dados irrecusáveis abundantemente confirmados pelas Ciências das Religiões. Há milhares de anos que as interrogações fundamentais sobre o sentido do mundo e da vida alimentam a reflexão do homem, que assim marca religiosamente os espaços socioculturais que constrói e habita.
- Cost/revenue optimisation in multi-service mobile broadband systemsPublication . Velez, Fernando J.; Correia, Luis M.Multi-service traffic has a strong impact in mobile broadband systems (MBS) revenues, allowing one to obtain merit functions for optimisation purposes. A 'net cost' model is presented for the design trade-offs between re-use pattern, K, the coverage distance, R, and the spectral efficiency, S/sub ef/(R). It allows for the determination of the revenue per basic channel, R/sub 384/, that achieves a given value for the annual profit per kilometre. Comparing the urban with the roads scenarios for R=100 in and K=2, whereas (S/sub ef/)/sub TOT/=32.2 and 15.2%, R/sub 384/ has to be 0.005 and 0.045 #/min, respectively, i.e., the prices in the roads scenario (with higher terminal mobility) have to be around one order of magnitude higher than in the urban one.