Biomedical subjects

N N Oiwa

Publications and source records attributed to N N Oiwa.

2 recordsLinked to original sources

PubMed2002

Lyapunov spectrum from time series using moving boxes.

We present a very fast algorithm (few seconds) for estimating full Lyapunov spectrum from time series. The method requires a smaller number of parameters than other time-average algorithms, and is tested for data with different numerical precision, sampling frequencies, total sampling times, and presence of noise. We report conclusive results for the electron density broadband fluctuations of a plasma at the edge of tokamak TBR-1.

Journal Article↗

PubMed2000

Phylogenetic study of the spatial distribution of protein-coding and control segments in DNA chains.

We examine the size and spatial distributions of the protein-coding and control segments of genes in DNA nucleotide sequences from GenBank. Phylogenetic analysis of these data suggests the presence of spatial order in sequences of higher organisms, irrespective of the nature of nucleotide base content. This is characterized by defined two-point correlation functions and measured by fractal dimensions and singularity spectrum.

Algorithms↗