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BEGIN:VEVENT
SUMMARY:Jean-Michel Coron (Université Pierre et Marie Curie)
DTSTART;VALUE=DATE-TIME:20200908T150000Z
DTEND;VALUE=DATE-TIME:20200908T161500Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/1
DESCRIPTION:Title: Rapid and finite-time stabilization\nby Jean-Michel Cor
on (Université Pierre et Marie Curie) as part of Control in Times of Cris
is. Online seminar.\n\n\nAbstract\nWe present various results on the rapid
and the finite-time stabilization of control systems.\nThis includes cont
rol systems in finite dimension (with an application to a quadcopter\nslid
ing on a plane) as well as control systems modeled by means of partial dif
ferential equations (1-D linear hyperbolic systems\, 1-D linear parabolic
equations and KdV equations).\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Claudia Moreno (Université Paris-Saclay (UVSQ))
DTSTART;VALUE=DATE-TIME:20200915T150000Z
DTEND;VALUE=DATE-TIME:20200915T153000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/2
DESCRIPTION:Title: Control of a partial differential equation system of di
spersive type\nby Claudia Moreno (Université Paris-Saclay (UVSQ)) as part
of Control in Times of Crisis. Online seminar.\n\nAbstract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Irene Marín-Gayte (Universidad de Sevilla)
DTSTART;VALUE=DATE-TIME:20200915T153000Z
DTEND;VALUE=DATE-TIME:20200915T160000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/3
DESCRIPTION:Title: Theoretical and numerical bi-objective optimal control:
Nash equilibria\nby Irene Marín-Gayte (Universidad de Sevilla) as part o
f Control in Times of Crisis. Online seminar.\n\nAbstract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marius Tucsnak (Université de Bordeaux)
DTSTART;VALUE=DATE-TIME:20200922T150000Z
DTEND;VALUE=DATE-TIME:20200922T160000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/4
DESCRIPTION:Title: Does the boundary controlled heat equation define an ex
actly controllable system?\nby Marius Tucsnak (Université de Bordeaux) as
part of Control in Times of Crisis. Online seminar.\n\n\nAbstract\nIt is
commonly accepted in the control theory of PDEs that parabolic equations\,
due to the smoothing effect\,\ndo not determine exactly controllable syst
ems when controlled from the boundary. The aim of this presentation\nis to
explain how the heat semigroup can be restricted to an appropriate functi
on space on which\, when\ncontrolled from the boundary\, it could determin
e an exactly controllable systems. To this aim\, we first recall\nsome abs
tract concepts concerning reachability in an infinite dimensional context\
, insisting on the general\nrelevance of the concept of reachable space. W
e next describe some recent advances on the reachable space of\nthe bounda
ry controlled heat equation in one space dimension. We next discuss the ex
act controllability of this\nsystem in appropriate spaces of analytic func
tions. We give applications in determining the reachable space\nwith smoot
h inputs\, with possible application to nonlinear problems. Finally\, we d
iscuss the possible\nimplications of our methods to improve the existing e
stimates of the control constant in small time.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jose A. Villa ((UNAM\, Mexico))
DTSTART;VALUE=DATE-TIME:20200929T150000Z
DTEND;VALUE=DATE-TIME:20200929T153000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/5
DESCRIPTION:Title: Hierarchical control for the semilinear heat equation.\
nby Jose A. Villa ((UNAM\, Mexico)) as part of Control in Times of Crisis.
Online seminar.\n\nAbstract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gilcenio Rodrigues ((U F di Piaui\, Brazil))
DTSTART;VALUE=DATE-TIME:20200929T153000Z
DTEND;VALUE=DATE-TIME:20200929T160000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/6
DESCRIPTION:Title: Boundary controllability of a one-dimensional phase-fie
ld system with one control force\nby Gilcenio Rodrigues ((U F di Piaui\, B
razil)) as part of Control in Times of Crisis. Online seminar.\n\nAbstract
: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Piermarco Cannarsa (Università degli Studi di Roma "Tor Vergata")
DTSTART;VALUE=DATE-TIME:20201006T150000Z
DTEND;VALUE=DATE-TIME:20201006T160000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/7
DESCRIPTION:Title: Bilinear control for evolution equations\nby Piermarco
Cannarsa (Università degli Studi di Roma "Tor Vergata") as part of Contro
l in Times of Crisis. Online seminar.\n\n\nAbstract\nThe observability for
the classical Schrödinger equation usually holds for very short\ntime\,
under suitable geometric conditions. However\, it is not the case when the
underlying geometry\nis sub-elliptic. In this talk we consider the Schrod
inger equation associated with the Bouendi-\nGrushin operator. The Bouendi
-Grushin operator is a subelliptic operator which is degenerate\nalong a l
ine. In the Bouendi case\, the associated Schrödinger equation exhibits a
transport effect\nwhich leads to a "sub-elliptic" geometric control condi
tion and a minimal time to ensure the\nobservability. For general Bouendi-
Grushin with stronger sub-elliptic effect\, the observability for\nthe Sch
rödinger equation is never true. These observability results can be seen
from a semi-\nclassical point of view\, through a optimal resolvent esti-
mate. Consequently\, our resolvent\nestimate leads to an energy decay rate
for the associated damped wave equation. This talk is\nbased on a joint w
ork with Nicolas Burq and another with Cyril Letrouit.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chenmin Sun (U. Cergy)
DTSTART;VALUE=DATE-TIME:20201013T153000Z
DTEND;VALUE=DATE-TIME:20201013T160000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/8
DESCRIPTION:Title: Classical and semi-classical observability for the Boue
ndi-Grushin operator\nby Chenmin Sun (U. Cergy) as part of Control in Time
s of Crisis. Online seminar.\n\n\nAbstract\nThe observability for the clas
sical Schrödinger equation usually holds for very short\ntime\, under sui
table geometric conditions. However\, it is not the case when the underlyi
ng geometry\nis sub-elliptic. In this talk we consider the Schrodinger equ
ation associated with the Bouendi-\nGrushin operator. The Bouendi-Grushin
operator is a subelliptic operator which is degenerate\nalong a line. In t
he Bouendi case\, the associated Schrödinger equation exhibits a transpor
t effect\nwhich leads to a "sub-elliptic" geometric control condition and
a minimal time to ensure the\nobservability. For general Bouendi-Grushin w
ith stronger sub-elliptic effect\, the observability for\nthe Schrödinger
equation is never true. These observability results can be seen from a se
mi-\nclassical point of view\, through a optimal resolvent esti- mate. Con
sequently\, our resolvent\nestimate leads to an energy decay rate for the
associated damped wave equation. This talk is\nbased on a joint work with
Nicolas Burq and another with Cyril Letrouit.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amaury Hayat (Ecole des Ponts Paristech)
DTSTART;VALUE=DATE-TIME:20201013T150000Z
DTEND;VALUE=DATE-TIME:20201013T153000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/9
DESCRIPTION:Title: Stabilization of some nonlinear hyperbolic PDEs\nby Ama
ury Hayat (Ecole des Ponts Paristech) as part of Control in Times of Crisi
s. Online seminar.\n\n\nAbstract\nAbstract: We consider two types of syste
ms : density-velocity systems and traffic flows.\nDensity-velocity systems
encompass many physical equations: isentropic Euler equations\,\nSaint-Ve
nant equations\, osmosis model\, etc. We show that these equations have a
local\ndissipative property that allows to stabilize any steady-state with
boundary feedback\ncontrols\, provided some physical assumption. Moreover
\, this holds even if we have no\nknowledge of some the system parameters
or with a single control.\nTraffic flows are very interesting from a contr
ol perspective. In many situations the\nsteady-states are unstable\, leadi
ng to travelling waves\, known as stop-and-go waves by\nengineers or simpl
y jam. From a mathematical point of view they can be represented by\ncoupl
ed hyperbolic PDEs with solutions of class BV. We will present on-going wo
rk showing\nhow one can try to stabilize the steady-states using autonomou
s vehicles\, i.e. pointwise\ncontrols. This leads to a system of ODEs and
PDEs coupled by a flux relation\, which provoke\nnon-classical shocks. The
solutions are then at most BV and the control is contained in the\ndynami
cs of the ODEs.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Karl Kunisch (U Grass\, Austria)
DTSTART;VALUE=DATE-TIME:20201020T150000Z
DTEND;VALUE=DATE-TIME:20201020T161500Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/10
DESCRIPTION:Title: Solution Concepts for Optimal Feedback Control of Nonli
near Partial Differential Equations\nby Karl Kunisch (U Grass\, Austria) a
s part of Control in Times of Crisis. Online seminar.\n\n\nAbstract\nFeedb
ack control of nonlinear systems in practice is still frequently based on
linearisation\nand subsequent treatment by efficient Riccati solvers. Here
we want to follow different directions.\n\nI concentrate on three solutio
n strategies which aim at the nonlinear control system directly. The\nfirs
t one is based on higher order Taylor expansions of the value function and
leads to controls\nwhich rely on generalized Ljapunov equations.\n\nThe s
econd approach is based on Newton steps applied to the HJB equation. Combi
ned with spectral\ntechniques and tensor calculus this allows to solve HJB
equations up to dimension 100. The results\nare demonstrated for the cont
rol of discretized Fokker Planck equations.\n\nThe third technique circumv
ents the direct solution of the HJB equation. Rather a neural network\nis
trained by means of a succinctly chosen ansatz and it is proven that it ap
proximates the solution\nto the HJB equation as the dimension of the netwo
rk is increased.\n\nThis work relies on collaborations with T.Breiten\, S.
Dolgov\, D.Kalise\, L.Pfeiffer\, and D.Walter.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Belhassen Dehman (Fac. des Sciences de Tunis\, Tunisia)
DTSTART;VALUE=DATE-TIME:20201103T160000Z
DTEND;VALUE=DATE-TIME:20201103T171500Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/11
DESCRIPTION:Title: Controllability of the Wave Equation on a rough compact
manifold.\nby Belhassen Dehman (Fac. des Sciences de Tunis\, Tunisia) as
part of Control in Times of Crisis. Online seminar.\n\nView-only livestrea
m: https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TBA
\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Suzanne Lenhart (University of Tennessee\, USA)
DTSTART;VALUE=DATE-TIME:20201117T160000Z
DTEND;VALUE=DATE-TIME:20201117T171500Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/12
DESCRIPTION:by Suzanne Lenhart (University of Tennessee\, USA) as part of
Control in Times of Crisis. Online seminar.\n\nView-only livestream: https
://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuri Thamsten (Universidade Fluminense)
DTSTART;VALUE=DATE-TIME:20201027T160000Z
DTEND;VALUE=DATE-TIME:20201027T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/13
DESCRIPTION:Title: Local null controllability of a class of non-Newtonian
incompressible viscous fluids\nby Yuri Thamsten (Universidade Fluminense)
as part of Control in Times of Crisis. Online seminar.\n\n\nAbstract\nWe i
nvestigate the null controllability property of systems that\nmathematical
ly describe the dynamics of some non-Newtonian incompressible\nviscous flo
ws. The principal model we study was proposed by O. A. Ladyzhenskaya\, alt
hough the techniques we develop here apply to other fluids having\na shear
dependent (or gradient dependent) viscosity. Taking advantage of the\nPon
tryagin Minimum Principle\, we utilize a bootstrapping argument to prove\n
that regular controls to the forced linearized Stokes problem exist\, as l
ong\nas the initial data in turn has enough regularity. From there\, we ex
tend the\nresult to the nonlinear problem. As a byproduct\, we devise a qu
asi-Newton\nalgorithm to compute the states and a control\, which we prove
to converge in\nan appropriate sense. We finish the work with some numeri
cal experiments.\nThis is a joint work with P. de Carvalho\, J. Límaco an
d D. Menezes.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jeffrey Park (University Alaska Fairbanks)
DTSTART;VALUE=DATE-TIME:20201027T163000Z
DTEND;VALUE=DATE-TIME:20201027T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/14
DESCRIPTION:Title: Inverse Problem for the Schrödinger Equation with Non-
self-adjoint Matrix Potential\nby Jeffrey Park (University Alaska Fairbank
s) as part of Control in Times of Crisis. Online seminar.\n\n\nAbstract\nW
e consider the dynamical system with boundary control for the vector Schr
ödinger equation on\nthe interval with a non-self-adjoint matrix potentia
l. For this system\, we study the inverse problem\nof recovering the matri
x potential from the dynamical Neumann-to-Dirichlet operator. We first pro
vide\na method to recover spectral data for the Schrödinger system. We th
en develop a strategy for solving\nthe inverse problem using this method w
ith other techniques of the Boundary Control method. This talk\nis based o
n joint work with Sergei Avdonin\, Alexander Mikhaylov\, and Victor Mikhay
lov.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kevin Le Balc'h (Université Bordeaux)
DTSTART;VALUE=DATE-TIME:20201110T160000Z
DTEND;VALUE=DATE-TIME:20201110T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/15
DESCRIPTION:by Kevin Le Balc'h (Université Bordeaux) as part of Control i
n Times of Crisis. Online seminar.\n\nView-only livestream: https://www.yo
utube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jon Asier Barcena-Petisco (Universidad Autonoma de Madrid)
DTSTART;VALUE=DATE-TIME:20201110T163000Z
DTEND;VALUE=DATE-TIME:20201110T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/16
DESCRIPTION:Title: Averaged dynamics and control for heat equations with r
andom diffusion\nby Jon Asier Barcena-Petisco (Universidad Autonoma de Mad
rid) as part of Control in Times of Crisis. Online seminar.\n\nView-only l
ivestream: https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstr
act: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ozkan Ozer (Western Kentucky University)
DTSTART;VALUE=DATE-TIME:20201201T160000Z
DTEND;VALUE=DATE-TIME:20201201T171500Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/17
DESCRIPTION:by Ozkan Ozer (Western Kentucky University) as part of Control
in Times of Crisis. Online seminar.\n\nView-only livestream: https://www.
youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julie Valein (Université Lorraine)
DTSTART;VALUE=DATE-TIME:20201215T160000Z
DTEND;VALUE=DATE-TIME:20201215T171500Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/18
DESCRIPTION:by Julie Valein (Université Lorraine) as part of Control in T
imes of Crisis. Online seminar.\n\nView-only livestream: https://www.youtu
be.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cristina Urbani (Gran Sasso Science Institute)
DTSTART;VALUE=DATE-TIME:20201124T160000Z
DTEND;VALUE=DATE-TIME:20201124T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/19
DESCRIPTION:by Cristina Urbani (Gran Sasso Science Institute) as part of C
ontrol in Times of Crisis. Online seminar.\n\nView-only livestream: https:
//www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wencel Valega Mackenzie (University Tennessee Knoxville)
DTSTART;VALUE=DATE-TIME:20201124T163000Z
DTEND;VALUE=DATE-TIME:20201124T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/20
DESCRIPTION:by Wencel Valega Mackenzie (University Tennessee Knoxville) as
part of Control in Times of Crisis. Online seminar.\n\nView-only livestre
am: https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract: TB
A\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorge Zavaleta (Universidad Nacional Autónoma de México)
DTSTART;VALUE=DATE-TIME:20201208T160000Z
DTEND;VALUE=DATE-TIME:20201208T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/21
DESCRIPTION:by Jorge Zavaleta (Universidad Nacional Autónoma de México)
as part of Control in Times of Crisis. Online seminar.\n\nView-only livest
ream: https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw\nAbstract:
TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lucas Machado
DTSTART;VALUE=DATE-TIME:20201208T163000Z
DTEND;VALUE=DATE-TIME:20201208T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T105247Z
UID:CTCSeminar/22
DESCRIPTION:by Lucas Machado as part of Control in Times of Crisis. Online
seminar.\n\nView-only livestream: https://www.youtube.com/channel/UC33xMR
29w3JPbwghO6-RwDw\nAbstract: TBA\n
URL:https://www.youtube.com/channel/UC33xMR29w3JPbwghO6-RwDw
END:VEVENT
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