GROGNARD , Frédéric

In agricultural applications, the introduction of predators is used to control the prey/pests level so that crop damage is limited; however, though a satisfactory equilibrium between predators and prey may exist, it may be unstable. In order to achieve pest control, its stabilization should then be achieved and, since predator releases occur at...

Managed ecosystems are ecosystems that are designed and handled, in which species of interest are chosen by humans. They are used in many fields of applications, spanning from bioreactors, in which microorganisms are put in interaction in order to achieve a specified industrial goal, to agriculture where crops are in interaction with their...

This paper presents a saturated proportional controller that achieves depollution of wastewater in a continuous anaerobic digester. This goal is reached by defining a region of the state-space where the depollution is achieved and forcing attractivity and invariance of this region. The control variable is the dilution rate and the controlled...

We consider the n-dimensional Lotka-Volterra system of differential equation representing the predator-prey interaction between n species. In this paper, we will try to control the system by the mean of a sign-definite control law that is based on a classical Lyapunov function for Lotka-Volterra-systems.Copyright c 2005 IFAC

This paper presents a saturated proportional controller that achieves depollution of wastewater in a continuous anaerobic digester. This goal is reached by defining a region of the state-space where the depollution is achieved and forcing attractivity and invariance of this region. The control variable is the dilution rate and the controlled...

The minimum-time bounded control of linear systems is generically bang-bang and the number of switchings does not exceed the dimension of the system if the eigenvalues of the system matrix are real or if the initial condition is sufficiently close to the target. This paper extends the method of Grognard & Sepulchre (2001) for computing the...

In this paper, we study the prophylactic biological control strategy for greenhouse crops protection. The method consists in the preventive installation of natural enemies to fight against an invading pest, using discrete augmentative (i.e. inondative) releases of the natural enemies. We consider a simple non negative prey (pest) -predator...

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