1 citations · 1 across the 4 of their papers we have counts for
5 papers
Absolutely continuous copulas with prescribed support constructed by differential equations, with an application in toxicology
Oscar Björnham, Niklas Brännström, Leif Persson
A new method for constructing absolutely continuous two--dimensional copulas by differential equations is presented. The copulas are symmetric with respect to reflection in the opp…
Source reconstruction using a bilevel optimisation method with a smooth weighted distance function
Niklas Brännström, Leif Å Persson
We consider a bilevel optimatisation method for inverse linear atmospheric dispersion problems where both linear and non-linear model parameters are to be determined. We propose th…
Absolutely continuous copulas obtained by regularization of the Frechét--Hoeffding bounds
Oscar Björnham, Niklas Brännström, Leif Persson
We show that the lower and upper Frechét-Hoeffding copulas, which are singular, can be regularized to absolutely continuous copulas. The method, which is constructive and explicit,…
Footprints and footprint analysis for atmospheric dispersion problems
Niklas Brännström, Leif Å Persson
Footprint analysis, also known as the study of Influence areas, is a first order method for solving inverse atmospheric dispersion problems. We revisit the concept of footprints gi…
A measure theoretic approach to linear inverse atmospheric dispersion problems
Niklas Brännström, Leif Å Persson
Using measure theoretic arguments, we provide a general framework for describing and studying the general linear inverse dispersion problem where no a priori assumptions on the sou…