Error Sequence Generation
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Estimador de variações de tensão de curta duração em sistemas elétricos de potência utilizando estratégias evolutivas. / Estimate short duration voltage variation using evolutionary strategies.
A methodology is herein proposed to estimate Short Duration Voltage Variation (SDVV) in electric power systems, caused by electrical faults. To attain this target, values recorded by measurement equipment in specific sites are used. In fact, there are few power quality meters installed in power networks, due to the high cost of such meters. Although these co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/09/2011
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2. Um injetor de erros aplicado à avaliação de desempenho do codificador de canal em redes IEEE 802.16 / Proposal of an error sequence generator applied to the performance analysis of IEEE 802.16 channel encoder
A necessidade de suportar serviços multimídia impulsiona o desenvolvimento das redes sem fio. Com isso, torna-se importante fornecer confiabilidade na transmissão de dados em um ambiente sujeito a variações espaciais, temporais e de freqüência, causadas por fenômenos físicos que, geralmente, causam erros nos dados transmitidos. Esses erros são basi
Publicado em: 2009
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3. Geradores de seqüências pseudoaleatórias usando caos em sistemas de espalhamento espectral
Spread sprectrum is a modulation technique that uses a binary sequence to spread an information signal in frequency domain. Conventionally, the process of spreading uses pseudo-random sequences created by shift-registers. However, sequences created using chaotic signals can also be employed because they have compatible spectral and autocorrelation properties
Publicado em: 2009
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4. Distributed coding turbo codes and second generation wavelets / Codificação distribuida de video digital utilizando codigos turbo e Waveletes de segunda geração
Distributed video coding is a new paradigm for video compression in opposition over the existing video coding standards like MPEG-x and H.26x families. These codecs make use of motion estimation algorithms, the main part of the compression process of the video signal. Hence, the compression process demands a high computational cost and high performance of th
Publicado em: 2006
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5. Uma metodologia para caracterizaÃÃo de trÃfego de vÃdio baseada nos momentos e primeira e segunda ordem
This thesis presents a new methodology for video traffic characterization. A set of states are defined by a classification algorithm based on the first and second order moments of the codified video sequences. Modulation processes and time series generation that possess statistics associated with the states, defined by the classification algorithm considered
Publicado em: 2004
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6. Metodos iterativos e multigrid adaptaveis em malhas não estruturadas
This work presents direct, iterative and multigrid methods for solving systems of equations obtained by means of the finite element method applied to linear elliptic problems, considering two and three dimensional elastic examples. Adaptive analysis aspects are also discussed by taking an error estimator and some stress recovery procedures. All the algorithm
Publicado em: 1996
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7. Targeted gene evolution in Escherichia coli using a highly error-prone DNA polymerase I
We present a system for random mutagenesis in Escherichia coli for the evolution of targeted genes. To increase error rates of DNA polymerase I (Pol I) replication, we introduced point mutations in three structural domains that govern Pol I fidelity. Expression of error-prone Pol I in vivo results in strong mutagenesis of a target sequence encoded in a P
National Academy of Sciences.
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8. Generation of a Highly Pathogenic Avian Influenza A Virus from an Avirulent Field Isolate by Passaging in Chickens
Highly virulent avian influenza viruses can arise from avirulent strains maintained in poultry, but evidence to support their generation from viruses in wild birds is lacking. The most likely mechanism for the acquisition of virulence by benign avian viruses is the introduction of mutations by error-prone RNA polymerase, followed by the selection of virulent
American Society for Microbiology.
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9. Single and Coincident Intragenic Mutations Attributable to Gene Conversion in a Human Cell Line
Two polymorphic sites are located within the heterozygous TK1 locus in the human lymphoblastoid cell line TK6: an inactivating frameshift in exon 4 of the nonfunctional allele and a phenotypically silent frameshift in exon 7 of the functional allele. Through the use of these intragenic polymorphisms and microsatellite markers that flank TK1, we demonstrate t
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10. MethTools—a toolbox to visualize and analyze DNA methylation data
The Bisulfite Genomic Sequencing technique has found wide acceptance for the generation of DNA-methylation maps with single-base resolution. The method is based on the selective deamination of cytosine to uracil (and subsequent conversion to thymine via PCR), whereas 5-methylcytosine residues remain unchanged. Methylation maps are created by the comparison o
Oxford University Press.
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11. Replication infidelity during a single cycle of Ty1 retrotransposition.
Retroviruses undergo a high frequency of genetic alterations during the process of copying their RNA genomes. However, little is known about the replication fidelity of other elements that transpose via reverse transcription of an RNA intermediate. The complete sequence of 29 independently integrated copies of the yeast retrotransposon Ty1 (173,043 nt) was d
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12. Spontaneous and mutagen-induced deletions: mechanistic studies in Salmonella tester strain TA102.
Salmonella tester strain TA102 carries the hisG428 ochre mutation on the multicopy plasmid pAQ1. DNA sequence analysis of 45 spontaneous revertants of hisG428 on the chromosome in the presence of pKM101 (strain TA103) indicates that hisG428 revertants fall into three major categories: (i) small, in-frame deletions (3 or 6 base pairs) that remove part or all