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Grégory François

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Related publications (42)

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Input Filter Design for Feasibility in Constraint-Adaptation Schemes

Dominique Bonvin, Grégory François, Gene Bunin

The subject of real-time, steady-state optimization under significant uncertainty is addressed in this paper. Specifically, the use of constraint-adaptation schemes is reviewed, and it is shown that, in general, such schemes cannot guarantee process feasib ...

2011

Comparison of Six Implicit Real-Time Optimization Schemes

Dominique Bonvin, Grégory François

Real-time optimization (RTO) is a class of methods that use measurements to reject the effect of uncertainty on optimal performance. This article compares six implicit RTO schemes, that is, schemes that implement optimality not through numerical optimizati ...

Lavoisier2012

Preclinically assessed optimal control of postprandial glucose excursions for type 1 patients with diabetes

Denis Gillet, Grégory François, Thierry Prud'Homme, Alain Bock

Type 1 Patients with Diabetes (Type 1 PwDs) have to frequently adjust their insulin dosage to keep their Blood Glucose concentration (BG) within normal bounds. Meal intakes represent the most important disturbance that has to be accounted for. Its effect d ...

2011

Use of Transient Measurements for Real-Time Optimization via Modifier Adaptation

Dominique Bonvin, Grégory François

Real-time optimization (RTO) methods use measurements to offset the effect of uncertainty and drive the plant to optimality. Explicit RTO schemes, which are characterized by solving a static optimization problem repeatedly, typically require multiple itera ...

2013

Run-to-Run MPC Tuning via Gradient Descent

Dominique Bonvin, Grégory François, Gene Bunin

A gradient-descent method for the run-to-run tuning of MPC controllers is proposed. It is shown that, with an assumption on process repeatability, the MPC tuning parameters may be brought to a locally optimal set. SISO and MIMO examples illustrate the char ...

Elsevier2012

Run-to-run Adaptation of a Semi-Adiabatic Policy for the Optimization of an Industrial Batch Polymerization Process

Dominique Bonvin, Grégory François, David Hunkeler

2004

Modifier Adaptation for Real-Time Optimization -- Methods and Applications

Dominique Bonvin, Grégory François, Timm Faulwasser, Alejandro Gabriel Marchetti

This paper presents an overview of the recent developments of modifier-adaptationschemes for real-time optimization of uncertain processes. These schemes have the ability to reach plant optimality upon convergence despite the presence of structural plant-m ...

MDPI2016

A Therapy Parameter-based Model for Predicting Blood Glucose Concentrations in Patients with Type 1 Diabetes

Denis Gillet, Grégory François, Alain Bock

In this paper, the problem of predicting blood glucose concentrations (BG) for the treatment of patients with type 1 diabetes, is addressed. Predicting BG is of very high importance as most treatments, which consist in exogenous insulin injections, rely on ...

Elsevier2015

Estimating reliability of blood glucose concentration predictions in patients with type 1 diabetes mellitus

Denis Gillet, Grégory François, Alain Bock

Blood glucose concentrations of patients with type 1 diabetes mellitus are subject to very high inter- and intra-patient variability. This variability may be detrimental to the reliability of the treatment, thus resulting in potentially frequent hypo- or h ...

Elsevier2014

A Real-Time Optimization Framework for the Iterative Controller Tuning Problem

Dominique Bonvin, Grégory François, Gene Bunin

We investigate the general iterative controller tuning (ICT) problem, where the task is to find a set of controller parameters that optimize some user-defined performance metric when the same control task is to be carried out repeatedly. Following a repeat ...

MDPI2013

A Globally Convergent Run-to-run Control Algorithm with Improved Rate of Convergence

Dominique Bonvin, Grégory François

2005

Experimental Real-Time Optimization of a Solid Oxide Fuel Cell Stack via Constraint Adaptation

Dominique Bonvin, Grégory François, Zacharie Wuillemin, Arata Nakajo, Gene Bunin, Leonidas Tsikonis

The experimental validation of a real-time optimization (RTO) strategy for the optimal operation of a solid oxide fuel cell (SOFC) stack is reported in this paper. Unlike many existing studies, the RTO approach presented here utilizes the constraint-adapta ...

2012

A Minimal Exercise Extension for Models of the Glucoregulatory System

Denis Gillet, Grégory François, Thierry Prud'Homme, Alain Bock

For patients with type 1 diabetes mellitus, appropriate control of blood glucose concentrations is vital. Exercise is one of the disturbances that can affect these concentrations. Therefore, predictions in the presence of exercise are useful among others f ...

Elsevier2011

Iterative Controller Tuning by Real-Time Optimization

Dominique Bonvin, Grégory François, Gene Bunin

The present article looks at the problem of iterative controller tuning, where the parameters of a given controller are adapted in an iterative manner to bring the user-defined performance metric to a local minimum for some repetitive process. Specifically ...

2013

Analysis of the Maximum Efficiency of Kite-Power Systems

Dominique Bonvin, Grégory François, Sean Costello

This paper analyzes the maximum power that a kite, or system of kites, can extract from the wind. Firstly, a number of existing results on kite system efficiency are reviewed. The results that are generally applicable require significant simplifying assump ...

2015

Exploiting Local Quasiconvexity for Gradient Estimation in Modifier-Adaptation Schemes

Dominique Bonvin, Grégory François, Gene Bunin

A new approach for gradient estimation in the context of real-time optimization under uncertainty is proposed in this paper. While this estimation problem is often a difficult one, it is shown that it can be simplified significantly if an assumption on the ...

Ieee Computer Soc2012

Directional Real-Time Optimization Applied to a Kite-Control Simulation Benchmark

Dominique Bonvin, Grégory François, Sean Costello

This paper applies a novel two-layer optimizing control scheme to a kite-control benchmark problem. The upper layer is a recent real-time optimization algorithm, called Directional Modifier Adaptation, which represents a variation of the popular Modifier A ...

IEEE2015

Real-Time Optimization when the Plant and the Model have Different Inputs

Dominique Bonvin, Grégory François, Sean Costello

Model-based optimization is an increasingly popular way of determining the values of the degrees of freedom in a process. The difficulty is that the available model is often inaccurate. Iterative set-point optimization, also known as modifier adaptation, o ...

2013

A Betz-Inspired Principle for Kite-Power Generation Using Tethered Wings

Dominique Bonvin, Grégory François, Sean Costello

This paper’s main contribution is a theoretical result that can be used to evaluate the maximum powergenerating potential of any kite-power system. An upper bound is derived for the power a wing can generate in a given wind speed. It is proven that the ang ...

Pergamon-Elsevier Science Ltd2014

Strategies de controle pour la gestion energetique d'un batiment

Grégory François

La consommation des ressources energetiques est actuellement un enjeu primordial, notamment dans le secteur du batiment, qui represente à lui seul 42 % de l’energie consommee en France. La mixite energetique, renouvelable et fossile, ainsi qu’une meilleure ...

2009