Research Interests

My current research is focused on developing new algorithms for simulation of biochemical processes and applications in the petrochemical industry.

Publications

Journal Publications

M. Guay, H. Hudon and K. Höffner Geometric Decomposition, Potential-based Representation, and Integrability of Nonlinear Systems. Submitted, 2013

S. M. Harwood, K. Höffner and P. I. Barton, Solution of Ordinary Differential Equations with a Linear Program Embedded: The Right-hand Side Case. Submitted, 2013

K. Höffner, S. M. Harwood and P. I. Barton, A Reliable Simulator for Dynamic Flux Balance Analysis, Biotechnology and Bioengineering, 110(3):792-802, 2013.

K. Höffner and M. Guay, Subriemannian Metric Induced by Single-Input Locally Accessible Control-Affine Systems, Physica D: Nonlinear Phenomena, 247(1):1-6, 2013

K. Höffner, N. Hudon and M. Guay, On-Line Feedback Control for Optimal Periodic Control Problems, Canadian Journal of Chemical Engineering, 85(4):479-489, 2007.

Peer-reviewed Conference Publications

M. Guay, N. Hudon and K. Höffner, Geometric Decomposition and Potential-based Representation of Nonlinear Systems, American Control Conference, 2121-2126, 2013

M. Guay, N. Hudon and K. Höffner, Representation and Control of Brayton–Moser Systems using a Geometric Decomposition, 4th IFAC Workshop on Lagrangian and Hamiltonian Methods for Non Linear Control, 66-71, 2012

K. Höffner and M. Guay, Decomposition of Linear Port-Hamiltonian Systems, American Control Conference, 3686-3691, 2011

K. Höffner and M. Guay, IDA-PBC with Constant Interconnection and Damping Structures, 18th IFAC World Congress, 7340-7345, 2011

K. Höffner and M. Guay, Construction of the interconnection and damping structure based on the set of admissible equilibria, 49th IEEE Conference on Decision and Control, 6254-6258, 2010

K. Höffner and M. Guay, Geometric Aspects of Interconnection and Damping Assignment Passivity-based Control, 8th IFAC Symposium on Nonlinear Control Systems, 629-634, 2010

K. Höffner and M. Guay, Geometries of Single-Input Locally Accessible Control Systems, American Control Conference, 1480-1484, 2009

K. Höffner and M. Guay, Reduction of Poisson structures via feedback invariant distributions, 48th IEEE Conference on Decision and Control, 7466-7471, 2009

N. Hudon, K. Höffner and M. Guay, Equivalence to Dissipative Hamiltonian Realization, 47th IEEE Conference on Decision and Control, 3163-3168, 2008

N. Hudon, K. Höffner and M. Guay, Existence of Optimal Homoclinic Orbits, American Control Conference, 3822-3829, 2008

K. Höffner, N. Hudon and M. Guay, Geometric Construction of Optimal Periodic Control Trajectories, 7th IFAC Symposium on Nonlinear Control Systems, 212-217, 2007

Conference Publications

M. Guay, N. Hudon and K. Höffner, Geometric Decomposition and Potential-based Representation of Nonlinear Systems, 20th International Symposium in Mathematical Theory and Networks and Systems, 2012

N. Hudon, K. Höffner and M. Guay, Power-Shaping Techniques in Process Control: Geometric Constructions, 60th Canadian Conference of Chemical Engineering, 2010

N. Hudon, K. Höffner and M. Guay, Construction of Optimal Periodic Control Trajectories, 9th Workshop on Optimal Control, Games and Nonlinear Dynamics, Montréal, 2007

K. Höffner and M. Guay, Geometric Construction of Optimal Periodic Control Trajectories 56th Canadian Conference of Chemical Engineering, Sherbrooke , 2006

Theses

PhD thesis: Geometric Aspects of Interconnection and Damping Assignment Passivity-based Control

Diploma thesis: Geometric Construction of Optimal Periodic Control Trajectories

Seminars and Presentations

  • Dynamic Flux Balance Analysis
    Parametric Sensitivities of Dynamic Systems with Linear Programs Embedded, AIChE 2012 Annual Meeting, Pittsburgh, PA, 2012.
    Dynamic Systems with Linear Programs Embedded, Invited talk at the Lehrstuhl für Regelungstechnik und Systemtheorie, Ruhr-Universität Bochum, 2012.
    --- , Invited talk at the MITSOS Lab at MIT, 2012.
    Nonsmooth Dynamic Optimization for Bioreactors with Flux Balance Models Embedded, AIChE 2011 Annual Meeting, Minneapolis, MN, 2011.
    Efficient Simulation of Dynamic Flux Balance Models, AIChE 2011 Annual Meeting, Minneapolis, MN, 2011.
  • Passivity-based Control and Port-Hamiltonian Systems
    Geometric Aspects of IDA-PBC, Invited talk at the Lehrstuhl für Regelungstechnik, Technical University of Munich, 2010.
    Constructive Decomposition of the Design Parameters in IDA-PBC, Fourth Biannual Meeting on Systems and Control Theory, Kingston, 2010.
    Parameterization in interconnection and damping assignment passivity-based control, PSEL Group Seminar Talk at MIT, Cambridge, 2010.
    Hamiltonian Vector Fields for CASs, Extraordinary Seminar at the Institute for System Theory and Automatic Control, Stuttgart, 2008.
    On Hamiltonian Vector Fields for Affine Control Systems, Analysis and Design of Nonlinear Control Systems, London (UK), 2008.
    Construction of Optimal Control Trajectories over Invariant Sets, Statistics & Control Meeting, Quebéc City, 2006.
Google scholar profile

Kai Höffner

Postdoctoral Associate




Building 66-264,
77 Massachusetts Ave,
Cambridge, MA 02139.


Phone: +1-617-253-6578
E-mail: hoeffner[at]mit.edu
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