PubMed Health⌕ Search

Biomedical subjects

BG Giraud

Publications and source records attributed to BG Giraud.

17 recordsLinked to original sources
PubMed2000

Diffusion over a saddle with a langevin equation

The diffusion problem over a saddle is studied using a multidimensional Langevin equation. An analytical solution is derived for a quadratic potential and the probability to pass over the barrier deduced. A very simple solution is given for the one-dimensional problem and a general scheme is shown for higher dimensions.

Journal Article↗
PubMed2000

Symmetries of independent statistical observables for ultrametric populations

When N=2(G), random data X(i), i=1,ellipsis,N show ultrametric covariations, represented by a binary tree, decorrelated observables are defined by a covariance matrix diagonalization. Eigenvalue degeneracies lead one to regroup such observables into eigenprojectors. Symmetries of such projectors are discussed. Such symmetries and degeneracies influence the robustness of the corresponding measurements under random permutations of data.

Journal Article↗