Search PubMed⌕ Search

Biomedical subjects

K Sznajd-Weron

Publications and source records attributed to K Sznajd-Weron.

3 recordsLinked to original sources
PubMed2002

Controlling simple dynamics by a disagreement function.

We introduce a formula for the disagreement function which is used to control a recently proposed dynamics of the Ising spin system. This leads to four different phases of the Ising spin chain at zero temperature. One of these phases is doubly degenerated (antiferromagnetic and ferromagnetic states are equally probable). On the borders between the phases two types of transitions are observed: infinite degeneration and instability lines. The relaxation of the system depends strongly on the phase.

Journal Article↗
PubMed2001

Population dynamics with and without selection.

A model describing population dynamics is presented. We study the effect of selection pressure and inbreeding on the time evolution of the population and the chances of survival. We find that the selection is in general beneficial, enabling survival of a population whose size is declining. Inbreeding reduces the survival chances since it leads to clustering of individuals. We have also found, in agreement with biological data, that there is a threshold value of the initial size of the population, as well as of the habitat, below which the population will almost certainly become extinct. We present analytical and computer simulation approaches.

Biological Evolution↗