Stefan Johansson

Researcher at Department of Computing Science

stefan.johansson@umu.se

+46 90 786 56 34

Plan 2, MIT-huset, UMIT-lab Umeå universitet, 901 87 Umeå

Affiliated as researcher at Curiosum

stefan.johansson@umu.se

+46 90 786 56 34

Tullkammaren, Thulegatan 1 Thulegatan 1, 903 26 Umeå

Latest publications

2019

Geometry of Matrix Polynomial Spaces

Foundations of Computational Mathematics

Dmytryshyn, Andrii; Johansson, Stefan; Kågström, Bo; et al.

2017

Canonical structure transitions of system pencils

SIAM Journal on Matrix Analysis and Applications, Society for Industrial and Applied Mathematics 2017, Vol. 38, (4) : 1249-1267

Dmytryshyn, Andrii; Johansson, Stefan; Kågström, Bo

2015

Canonical structure transitions of system pencils

Report / UMINF, 15.15

Dmytryshyn, Andrii; Johansson, Stefan; Kågström, Bo

2015

Geometry of spaces for matrix polynomial Fiedler linearizations

Report / UMINF, 15.17

Dmytryshyn, Andrii; Johansson, Stefan; Kågström, Bo; et al.

2013

Codimension computations of congruence orbits of matrices, symmetric and skew-symmetric matrix pencils using Matlab

Report / UMINF, 13.18

Dmytryshyn, Andrii; Johansson, Stefan; Kågström, Bo

2013

Stratification of full rank polynomial matrices

Linear Algebra and its Applications, Elsevier 2013, Vol. 439, (4) : 1062-1090

Johansson, Stefan; Kågström, Bo; Van Dooren, Paul

2012

StratiGraph Tool: Matrix Stratifications in Control Applications

Control and Optimization with Differential-Algebraic Constraints, Philadelphia: Society for Industrial and Applied Mathematics 2012 : 79-103

Kågström, Bo; Johansson, Stefan; Johansson, Pedher

2011

StratiGraph Tool: Matrix Stratifications in Control Applications

Report / UMINF, 11.12

Kågström, Bo; Johansson, Stefan; Johansson, Pedher

2010

A numerical evaluation of solvers for the periodic riccati differential equation

BIT Numerical Mathematics, Springer 2010, Vol. 50, (2) : 301-329

Gusev, Sergei; Johansson, Stefan; Kågström, Bo; et al.

2009

A Numerical Evaluation of Solvers for the Periodic Riccati Differential Equation

Report / UMINF, 09.03

Gusev, Sergei; Johansson, Stefan; Kågström, Bo; et al.

2009

Reviewing the Closure Hierarchy of Orbits and Bundles of System Pencils and Their Canonical Forms

Report / UMINF, 09.02

Johansson, Stefan

2009

Stratification of controllability and observability pairs: theory and use in applications

SIAM Journal on Matrix Analysis and Applications, Philadelphia: Society for Industrial and Applied Mathematics 2009, Vol. 31, (2) : 203-226

Elmroth, Erik; Johansson, Stefan; Kågström, Bo

2009

Tools for Control System Design: Stratification of Matrix Pairs and Periodic Riccati Differential Equation Solvers

Report / UMINF, 09.04

Johansson, Stefan

2007

Comparing One-shot and Multi-shot Methods for Solving Periodic Riccati Differential Equations

Proceedings of the third IFAC Workshop on Periodic Control Systems (PSYCO’07), International Federation of Automatic Control 2007 : 1-6

Johansson, Stefan; Kågström, Bo; Shiriaev, Anton; et al.

2004

Orbit and Bundle Stratification for Controllability and Observability Matrix Pairs in StratiGraph

Proceedings of the 16th International Symposium on Mathematical Theory of Networks and Systems (MTNS) : 1-9

Elmroth, Erik; Johansson, Pedher; Johansson, Stefan; et al.

2004

Orbit and bundle stratification of controllability and observability matrix pairs in StratiGraph

Proceedings MTNS 2004

Elmroth, Erik; Johansson, Pedher; Johansson, Stefan; et al.

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Research projects

1 January 1998

StratiGraph and MCS Toolbox

Research subject: Computing science

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Stefan Johansson

Latest publications

Research projects