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- Krister Forsman
- 1993

LINKÖPING This report and other reports from the automatic control group in Linkk oping are available by anonymous Abstract. We analyze Glad/Fliess algebraic observability for polynomial control systems from a commutative algebraic/algebro-geometric point of view. Furthermore we show some relations between algebraic observabil-ity and realization theory for… (More)

- Krister Forsman
- 1992

LINKÖPING This report and other reports from the automatic control group in Linkk oping are available by anonymous Abstract. I reproduce an elementary proof for the jacobian criterion for algebraic dependence and give an introduction to the basics of KK ahler diierentials. All results presented are known, but some of them are not easily accessible, either… (More)

Frequent inlet flow changes typically cause problems for averaging level controllers. For a frequently changing inlet flow the upsets do not occur when the system is in steady state and the tank level at its set-point. For this reason the tuning of the level controller gets quite complicated, since not only the size of the upsets but also the time in… (More)

- Krister Forsman
- 1993

This paper describes the features and implementation of the Maple package Polycon which is intended to assist the control theorist in the analysis of nonlinear dynamical systems, in continuous and discrete time. Polycon handles systems where all nonlinearities are polynomial or rational functions. It implements functions that are not available at a \usable"… (More)

- Krister Forsman
- 1993

This report collects some useful results from commutative algebra and describes how they can be used to decrease the complexity in Grr obner base computations. As a byproduct we see how Grr obner bases relate to characteristic sets. The algorithms presented are well known but have, as far as the author knows not been collected in one place earlier.

- Krister Forsman
- 1993

Some connections between constructive real algebraic geometry and constrained optimization are exploited. We show how the problem of determining the projection of a real-algebraic variety on a certain axis is equivalent to a problem in nonlinear programming. As an application, Grr obner bases are used to deal with an optimization problem arising in the… (More)

- K E Forsman
- Postgraduate medicine
- 1995

Lice and mites are highly contagious obligate parasites of humans and are spread by close, direct contact. Head, body, and pubic lice produce severely pruritic eruptions in their respective locations. Diagnosis is readily made by finding lice or nits on hair shafts, except in the case of body lice, which are found on the seams of clothing. Scabies often… (More)

Methods from computer algebra, mostly so called Grr obner bases from commutative algebra, are used to solve the algebraic Riccati equation (ARE) symbolically. The methods suggested allow us to track the innuence of parameters in the system or penalty matrices on the solution. Some non-trivial aspects arise when addressing the problem from the point of view… (More)

- Krister Forsman
- 1992