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Let A be a mesh parameter corresponding to a finite element mesh for an elliptic problem. We describe preconditioning methods for two-level meshes which, for most problems solved in practice, behaveâ€¦ (More)

- Ivar Gustafsson, Gunhild Lindskog
- Numerical Lin. Alg. with Applic.
- 1995

A class of parallelizable preconditioned iterative methods for the solution of certain finite difference or finite element linear systems of equations is presented. The methods are based onâ€¦ (More)

- Ivar Gustafsson
- 1996

It is well known that standard incomplete factorization (IC) methods exist for M-matrices 14] and that modiied incomplete factorization (MIC) methods exist for weakly diagonally dominant matrices 8].â€¦ (More)

- Ivar Gustafsson, Gunhild Lindskog
- Numerical Lin. Alg. with Applic.
- 1998

The discretised linear elasticity problem is solved by the preconditioned conjugate gradient (pcg) method. Mainly we consider the linear isotropic case but we also comment on the more general linearâ€¦ (More)

- Bengt Lennartson, Richard H. Middleton, Ivar Gustafsson
- IEEE Transactions on Automatic Control
- 2012

The numerical sensitivity of linear matrix inequalities (LMIs) arising from discrete-time control with short sampling periods is analyzed using shift and delta operators. The delta operator avoidsâ€¦ (More)

- Ivar Gustafsson, Gunhild Lindskog
- Numerical Lin. Alg. with Applic.
- 2002

This is the second part of a trilogy on parallel solution of the linear elasticity problem. We consider the plain case of the problem with isotropic material, including discontinuous coe cients, andâ€¦ (More)

- E. Martin, Ivar Gustafsson, Jonny Johansson, Jerker Delsing
- IEEE International Workshop on Intelligent Signalâ€¦
- 2005

A relative ultrasound energy estimation circuit has been designed in a standard 0.35-/spl mu/m CMOS process, to be a part of a thumb size Internet connected wireless ultrasound measurement system.â€¦ (More)

- Ivar Gustafsson
- 2002

- Ivar Gustafsson, Gunhild Lindskog
- Numerical Lin. Alg. with Applic.
- 1996

Finite element meshes and nodenumberings suitable for para llel solution with equally loaded processors are presented for linear orthotropic elliptic partial differenti al equations. These problemsâ€¦ (More)

- Ivar Gustafsson, Gunhild Lindskog
- Numerical Lin. Alg. with Applic.
- 2013

This is the third part of a trilogy on parallel solution of the linear elasticity problem. We consider the separate displacement ordering for a plain isotropic problem with full Dirichlet boundaryâ€¦ (More)