Random Numbers Generation
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Hardware/Software codesign of particle filter for real time localization of mobile robots / Co-projeto de hardware/software do filtro de partículas para localização em tempo real de robôs móveis
Sophisticated techniques for estimation of models based on simulation, particle filters or Sequential Monte Carlo Methods, were recently used to solve many difficult problems in the field of mobile robotics. However, the success of particle filters was limited to the computation of parameters in low dimensionality spaces. The current research efforts in mobi
Publicado em: 2010
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2. Generation of diversity in Streptococcus mutans genes demonstrated by MLST
Streptococcus mutans, consisting of serotypes c, e, f and k, is an oral aciduric organism associated with the initiation and progression of dental caries. A total of 135 independent Streptococcus mutans strains from caries-free and caries-active subjects isolated from various geographical locations were examined in two versions of an MLST scheme consisting o
Publicado em: 2010
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3. Padrões de utilização de antibacterianos em três unidades de terapia intensiva do Distrito Federal
To know the patterns of use of antibacterial agents in the intensive care units (ICU) of the Federal District have been conducted two studies. The first study was retrospective and it was done in a private hospital, from January 2001 to June 2004. There used aggregate data from the electronic files of the hospital pharmacy and all 2890 patients admitted to t
Publicado em: 2007
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4. Sthocastic model to estimate the soybean productivity in the State of São Paulo through bivaried normal simulation / Modelo estocástico para estimação da produtividade de soja no Estado de São Paulo utilizando simulação normal bivariada
The availability of resources, as much of financial order and human labor, is scarse. Therefore, it must stimulates the regional planning that minimizes the use of resources. Then, the forecast of harvests through modelling techniques must previously on the basis of be carried through the regional characteristics, thus indicating the routes of the research,
Publicado em: 2007
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5. SubstituiÃÃo homofÃnica: aspectos teÃricos e prÃticos / Homophonic substitution: theoretical and practical aspects
This thesis has as main purposes: a) to review the information-theoretic treatment given to the GÃntherâs type of homophonic substitution, b) to propose improvements of this approach, c) to investigate the practical implementation of homophonic substitution systems, considering that the plaintext symbol probabilities are rational numbers. The concept of st
Publicado em: 2006
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6. A recipe for randomness
Despite many diverse theories that address closely related themes—e.g., probability theory, algorithmic complexity, cryptoanalysis, and pseudorandom number generation—a near-void remains in constructive methods certified to yield the desired “random” output. Herein, we provide explicit techniques to produce broad sets of both highly irregular fi
The National Academy of Sciences.
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7. Statistical Tests of Neutrality of Mutations
Mutations in the genealogy of the sequences in a random sample from a population can be classified as external and internal. External mutations are mutations that occurred in the external branches and internal mutations are mutations that occurred in the internal branches of the genealogy. Under the assumption of selective neutrality, the expected number of
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8. Nonrandom HIV-1 infection and double infection via direct and cell-mediated pathways
Cells infected with two related retroviruses can generate heterozygous virions, which are the precursors of recombinant proviruses. Although many studies have focused on the frequencies and mechanisms of retroviral recombination, little is known about the dynamics of double infection. To examine this issue, viruses generated from two HIV-1 vectors containing
National Academy of Sciences.
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9. First Generation Synchrony of Isolated Hyphomicrobium Swarmer Populations1
A method is described for obtaining synchronously growing swarmer cell populations of Hyphomicrobium sp. strain B-522. This was accomplished by isolating young swarmers from random cultures by centrifugation and filtration. Cell multiplication occurred during 38% of the growth cycle in populations synchronized in this manner. Observations were made of the ch
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10. The initiation cascade for chromosome replication in wild-type and Dam methyltransferase deficient Escherichia coli cells.
'Newborn' Escherichia coli B/r cells, obtained by membrane elution, were used to study the cell cycles of wild-type and Dam methyltransferase mutants. In wild-type cells, initiation of chromosome replication was synchronous and tightly controlled. In dam mutants, initiation was altered, but not random. We propose that this is due to the absence of an initiat
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11. Pedigree Analyses of Yeast Cells Recovering from DNA Damage Allow Assignment of Lethal Events to Individual Post-Treatment Generations
Haploid cells of Saccharomyces cerevisiae were treated with different DNA damaging agents at various doses. A study of the progeny of individual such cells (by pedigree analyses up to the third generation) allowed the assignment of lethal events to distinct post treatment generations. By microscopically inspecting those cells which were not able to form visi
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12. Heritability and Variability in Ribosomal RNA Genes of Vicia faba
We have compared the restriction patterns and copy numbers of ribosomal RNA genes (rDNA) between and within individuals of Vicia faba . While the EcoRI blot-hybridization patterns changed only after one to two generations, copy number changes were found among different tissues of the same plant. Copy number differences among individuals in the population wer