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Staff photo Stefan Johansson

Stefan Johansson

Contact

E-mail
stefan.johansson@umu.se
Phone
+46 90 786 56 34

Works at

Affiliation
Researcher at Department of Computing Science
Location
Plan 2, MIT-huset, UMIT-lab Umeå universitet, 901 87 Umeå
Affiliation
Affiliated as researcher at Curiosum
Location
Tullkammaren, Thulegatan 1 Östra strandgatan 32, 903 33 Umeå
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
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
A Numerical Evaluation of Solvers for the Periodic Riccati Differential Equation
Report / UMINF, 09.03
Gusev, Sergei; Johansson, Stefan; Kågström, Bo; et al.
2009
Tools for Control System Design: Stratification of Matrix Pairs and Periodic Riccati Differential Equation Solvers
Report / UMINF, 09.04
Johansson, Stefan
2009
Reviewing the Closure Hierarchy of Orbits and Bundles of System Pencils and Their Canonical Forms
Report / UMINF, 09.02
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.
View publications in DiVA

Research groups

Group member
Matrix Computations with Applications

Research projects

1 January 1998
StratiGraph and MCS Toolbox