Probability Density Functions
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. Contribuições teoricas para o estudo de funções de distribuição correlacionadas em um canal sem fio / Theoretical contributions to the study of correlated distributions funcions of wireless channels
In wireless communications, the multipath fading is modeled by several distributions including Hoyt, Rayleigh, Weibull, Nakagami-m, and Rice. In this thesis, new, exact expressions for the bivariate Hoyt (Nakagami-q) processes with arbitrary correlation in a nonstationary environment are derived. More specifically, the following are obtained: joint probabili
Publicado em: 2009
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14. ESTUDO DO REGIME HIDROLÃGICO NO SEMI-ÃRIDO BRASILEIRO POR MODELAGEM DINÃMICA ACOPLADA: APLICAÃÃO EM GERENCIAMENTO DE RESERVATÃRIOS / STUDY OF HYDROLICAL REGIMEN IN THE BRAZILIAN SEMI-ARID BY COUPLING DYNAMIC MODELING: APPLICATION IN MANAGEMENT OF RESERVOIRS
A premissa pelo uso racional da Ãgua tem demandado informaÃÃes em escalas de espaÃo e tempo cada vez menores. Neste estudo investiga-se a sensibilidade da simulaÃÃo climÃtica de um downscaling dinÃmico de precipitaÃÃo (1971-2000) acoplado a um modelo chuva-vazÃo e sua aplicaÃÃo na operaÃÃo de um reservatÃrio hÃdrico na regiÃo semi-Ãrida do
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/06/2008
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15. Timoshenko beam with uncertainty on the boundary conditions
In mechanical system modeling, uncertainties are present and, to improve the predictability of the models, they should be taken into account. This work discusses uncertainties present in boundary conditions using the model of a vibrating Timoshenko beam, free in one end and pinned with rotation constrained by a linear elastic torsional spring in the other en
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-12
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16. An analysis on single and central diffractive heavy flavour production at hadron colliders
In this contribution results from a phenomenological analysis for the diffractive hadroproduction of heavy flavors at high energies are reported. Diffractive production of charm, bottom and top are calculated using the Regge factorization, taking into account recent experimental determination of the diffractive parton density functions in Pomeron by the H1 C
Brazilian Journal of Physics. Publicado em: 2008-09
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17. Effects of varying curvature and width on the electronic states of GaAs quantum rings
Stationary states of an electron in thin GaAs elliptical quantum rings are calculated within the effective-mass approximation. The width of the ring varies smoothly along the centerline, which is an ellipse. The solutions of the Schrödinger equation with Dirichlet boundary conditions are approximated by a product of longitudinal and transversal wave functio
Brazilian Journal of Physics. Publicado em: 2006-06
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18. Detecção de intrusão em redes de computadores com estatísticas PDF e classificadores neurais
This work is a study about architectures, methods and results on computer networks intrusion detection to avoid Denial-of-Services attacks. The main techniques used were: packet-oriented window observation, structured hierarchical processes, anomaly based network intrusion detection by monitoring several network traffic parameters simultaneously. The Probabi
Publicado em: 2006
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19. A study of statistical models used for ultrasonic tissue characterization / Estudo de modelos estatisticos utilizados na caracterização de tecidos por ultra-som
O diagnóstico médico por ultra-som vem sendo amplamente difundido, tornando-se referência em muitos exames clínicos, destacando-se as imagens em modo-B, capazes de representar a anatomia de tecidos e órgãos de forma não-invasiva, em tempo real e sem a utilização de radiação ionizante. Entretanto, o speckle, artefato inerente aos sistemas que utili
Publicado em: 2006
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20. Modelo computacional para determinação do risco econômico em culturas irrigadas / Computational model for economical risk determination in irrigated cultures
The agricultural companies were submitted to risky conditions, so the utility of deterministic models to planning is relatively limited. That implies in not despise the randomness of some coefficients and to introduce them in the project analysis. As a proposal of this work a Computational model for risk determination in irrigated cultures was elaborated for
Publicado em: 2005
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21. Growth, Production and Economic Analysis of Clonal Stands of Eucalyptus sp. in Agroforest Systems. / Crescimento,produÃÃo e anÃlise econÃmico de povoamentos Clonais de Eucalyptus sp, em sistemas agroflorestal.
The aims of the present study were to adjust models of productivity for a sawmill to test taper functions using segmented and non segmented polynomial models to estimate the profile of the treesâ trunk to prognosticate the present and future production of stands of eucalypt and to analyse the economic viability of a âagrossilvopastorilâ system with eucaly
Publicado em: 2005
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22. Evaluation of the quality in a cohesive argisolic YELLOW LATOSOL - lax over the tableland soil, under a natural forest / Avaliação da qualidade de um LATOSSOLO AMARELO Coeso argissólico dos Tabuleiros Costeiros,sob floresta natural
The soil is a natural resource, whose functions in the healthy atmosphere are essential for the maintenance and development of life in the planet. Its capacity to function appropriately as substratum for vegetables filter and lid of residues, regulator of the flow of gases, water and energy is defined as the soil quality. The determination of the soil qualit
Publicado em: 2005
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23. WEATHER-RELATED GEO-HAZARD ASSESSMENT MODEL FOR RAILWAY EMBANKMENT STABILITY
The primary objective of this thesis is to develop a model for quantification of weather-related railway embankments hazards. The model for quantification of embankment hazards constitutes an essential component of a decision support system that is required for the management of railway embankment hazards. A model for the deterministic and probabilistic asse
Publicado em: 2005
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24. Uncertainties regarding dengue modeling in Rio de Janeiro, Brazil
Dengue fever is currently the most important arthropod-borne viral disease in Brazil. Mathematical modeling of disease dynamics is a very useful tool for the evaluation of control measures. To be used in decision-making, however, a mathematical model must be carefully parameterized and validated with epidemiological and entomological data. In this work, we d
Memórias do Instituto Oswaldo Cruz. Publicado em: 2003-10