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

Latest publications

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