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Staff photo Stefan Johansson

Stefan Johansson

Deputy director at Curiosum and associate professor at the Department of Computing Science.

Contact

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

Works at

Affiliation
Research fellow (absent) at Department of Computing Science
Location
Plan 2, MIT-huset, UMIT-lab Umeå universitet, 901 87 Umeå
Affiliation
Associate professor at Department of Computing Science
Location
Plan 2, MIT-huset, UMIT-lab Umeå universitet, 901 87 Umeå
Affiliation
Affiliated as research fellow at Curiosum
Location
Sliperiet, Östra strandgatan 32 Östra strandgatan 32, 903 33 Umeå
2019
Geometry of Matrix Polynomial Spaces
Foundations of Computational Mathematics, Vol. 20, (3) : 423-450
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
Reviewing the Closure Hierarchy of Orbits and Bundles of System Pencils and Their Canonical Forms
Report / UMINF, 09.02
Johansson, Stefan
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.
View publications in DiVA

Research groups

Group member
Matrix Computations with Applications
Parallel and Scientific Computing

Research projects

1 January 1998
StratiGraph and MCS Toolbox