Books Published

Linear parabolic-hyperbolic fluid-structure interaction models. The case of static interface. Chapter 2 in ``Mathematical Theory of Evolutionary Fluid--Flow Structure Interaction'', p 53--172, Birkhauser 2018, Oberwolfach Seminars vol 48.

Tangential boundary stabilization of Navier-Stokes Equation by finitely many feedback controllers (with I. Lasiecka and B. Priyasad), London Mathematical Society Lecture Notes, to appear.

Research monograph: Stabilization and controllability of nonlinear control systems governed by partial differential equations (with I. Lasiecka), in preparation, preliminary draft of 450 pages available, Springer-Verlag.

Boundary Control and Boundary Inverse Theory for Non-Homogeneous Second-Order Hyperbolic Equations: A Common Carleman Estimates Approach (with S. Liu), published under SISSA auspices in a book series of the American Institute of Mathematics in 2012, 110 pp. [Outgrowth of lectures given at SISSA (Scuola Internazionale di Studi Avanzati), Trieste, Italy, May 2011.]

Nonlinear exact controllability and nonlinear stabilization of hyperbolic or hyperbolic-like evolution equations, Matematica Contemporanea, 38 (2010), 192 pp. Outgrowth of lectures given at Universidade Federal do Rio de Janeiro, August 3–7, 2009.

Tangential Boundary Stabilization of Navier–Stokes Equations (with V. Barbu and I. Lasiecka), Memoirs AMS 181 (852) (May 2006), 28 pp.

Research monographs: Control Theory for Partial Differential Equations: Continuous and Approximation Theories, Vol. 1 (680 pp.), and Vol. 2 (422 pp.) (with I. Lasiecka), Encyclopedia of Mathematics and Its Applications Series, Cambridge University Press, January 2000 (Vol. 3 in preparation, 6 chapters completed.) It contains numerous new results by the authors not appeared in print before. Both volumes received the Featured Review by the AMS.

Differential and Algebraic Riccati Equations with applications to boundary/point control problems: Continuous theory and approximation theory (with I. Lasiecka), Vol. 164, Springer-Verlag Lecture Notes Series in Control and Information Sciences, 1991, 160 pp.

Editor of Control Problems for systems described by partial differential equations and applications (with I. Lasiecka), Springer-Verlag Lecture Notes 97. Proceedings of the IFIP-WG 7.2 Working Conference held at University of Florida, Gainsville, 1986, pp. 396.

Editor of Differential geometric methods in the control of partial differential equations (with R. Gulliver and W. Littman) Contemporary Mathematics, Vol. 268 (2000), AMS Publication. Proceedings of AMSIMS-SIAM Summer Research Conference, held at the University of Colorado, Boulder, June 27–July 2, 1999.

Editor of Control Theory for Partial Differential Equations (with G. Leugering, O. Imannvilov, B. Zhang), CRC formerly Marcel Dekker Lecture Notes in Pure and Applied Mathematics, May 2005. Proceedings of NSF-supported Conference, held at Georgetown University, June 2004.

Editor of Control Methods in PDE-Dynamical Systems (with F. Ancona, I. Lasiecka, W. Littman), Contemporary Mathematics, expected to be published in 2006, AMS Publication. Proceedings of AMS-IMSSIAM Summer Research Conference, held at Snowbird Resort, Utah, July 2–7, 2005.

Refereed Journal Publications

Delayed control action controllable systems in Banach space, Control and Cybernetics, Polish Academy of Science 3 (1974), 95-117.

Controllability and observability in Banach space with bounded operators, SIAM J. Control Optimiz. 13(1) (1975), 462-49.

Pathological asymptotic behavior of control systems in Banach space, J. Math. Anal. Appl. 49 (1975),411-4

On the lack of exact controllability for mild solutions in Banach space, J. Math. Anal. Appl. 50(1975), 438-446.

Extensions of rank conditions for controllability and observability to Banach spaces and unbounded operators, SIAM J. Control Optimiz.14 (1976), 313-338.

On the stabilizability problem in Banach space, J. Math. Anal. Appl. 52 (1975), 383-403. Addendum: On the stabilizability problem. . ., J. Math. Anal. Appl. 56 (1976), 492-493.

A note on the lack of exact controllability for mild solutions in Banach Space, SIAM J. Control Optimiz. 15(3) (1977), 407-411.

Function space controllability of linear retarded systems: A derivation from abstract operator conditions (with A. Manitius), SIAM J. Control Optimiz. 16 (1978), 599-645.

Sufficient conditions for function space controllability and feedback stabilizability of linear retarded system (with A. Manitius), IEEE Transaction of Automatic Control, (1978), 659-665. (Also, announcement in Proceedings of the Decision and Control Conference, Florida, December 1976.

On the relationship between first and second order controllable systems in Banach space, SIAM J. Control Optimiz. 16 (1978), 847-859. (Also, preliminary versions in Proceedings of the International Workshop on Infinite Dimensional Systems, University of Rome, Italy, June 1976, Springer-Verlag Lecture Notes, and Proceedings of 1976 Allerton Conference on System Theory, University of Illinois, Urbana.)

A cosine operator approach to modeling boundary inputs problems for hyperbolic systems, Proceedings of 8th IFIP Conference on Differential Equations and Optimization Techniques, University of Wurzburg, West Germany, September 1977. Springer-Verlag Lecture Notes on Control Sciences 6 (1978), 380-390.

Analytic properties of cosine operators (with S. Nelson). Proceedings Amer. Math. Soc. 74 (1978),101-104.

Boundary stabilization of parabolic equations, International Conference on Recent Advances in Differential Equations, Miramare-Trieste (Italy), R. Conti (editor), Academic Press, August 1978. (Also, Proceedings of International Conference on Systems Analysis, I.R.I.A., Paris, Springer-Verlag LNCIS 14 (1978), 305-313.)

On Nambu's boundary stabilizability problem for diffusion processes, J. Diff. Eqns. 33 (1979), 189-200.

Well-posedness and regularity of boundary feedback parabolic systems, J. Diff. Eqns. 36 (1980),347-362.

Boundary feedback stabilizability of parabolic equations, Appl. Math. Optimiz. 6 (1980), 201-220.

A cosine operator approach to modelling L2 (0, T;L2(Ω)) boundary input hyperbolic equations (with I. Lasiecka), Appl. Math. Optimiz. 7 (1981), 35-83.

Hyperbolic equations with Dirichlet boundary feedback via position vector: Regularity and almost periodic stabilization, Part I (with I. Lasiecka), Appl. Math. Optimiz. 8 (1981), 1-37.

Hyperbolic equations with Dirichlet boundary feedback via position vector: regularity and almost periodic stabilization, Part II (with I. Lasiecka), Appl. Math. Optimiz. 8 (1982), 103-130.

Hyperbolic equations with Dirichlet boundary feedback via position vector: regularity and almost periodic stabilization, Part III (with I. Lasiecka), Appl. Math. Optimiz. 8 (1982), 199-221.

Structural assignment of Neumann boundary feedback parabolic equations: The case of trace in the feedback loop (with I. Lasiecka), Annali Matem. Pura Appl. (IV) XXXII (1982), 131-175.

An L2-theory for the quadratic optimal cost problem of hyperbolic equations with control in the Dirichlet B.C. (with I. Lasiecka), Springer-Verlag Lecture Notes 54 (1982), 138-153.

Stabilization and structural assignment of Dirichlet boundary feedback parabolic equations (with I. Lasiecka), SIAM J. Control Optimiz. 21 (1983), 766-803.

Dirichlet boundary control problem for parabolic equation with quadratic cost: Analyticity and Riccati'-s feedback synthesis (with I. Lasiecka), SIAM J. Control Optimiz. 21 (1983), 41-67.

Stabilization of Neumann boundary feedback parabolic equations: The case of trace in the feedback loop (with I. Lasiecka), Appl. Math. Optimiz. 10 (1983), 307-350. (Preliminary version in Springer-Verlag Lecture Notes 54 (1983), 238-246.)

Boundary feedback stabilization problems for hyperbolic equations, Springer-Verlag Lecture Notes 54 (1983), 238-246.

Feedback semigroups and cosine operators for boundary feedback parabolic and hyperbolic equations (with I. Lasiecka), J. Diff. Eqns. 47 (1983), 246-272.

Dirichlet boundary stabilization of the wave equation with damping feedback of finite range (with I. Lasiecka), J. Math. Anal. Appl. 97 (1983), 112-130.

Regularity of hyperbolic equations under L2 (0, T;L2(Γ))-Dirichlet boundary terms (with I. Lasiecka), Appl. Math. Optimiz. 10 (1983), 275-286.

Nondissipative boundary stabilization of hyperbolic equations with boundary observation (with I. Lasiecka), J. Math. Pures Appl. 63, (1984), 59-80.

A-bounded, finite rank perturbations of s.c. group generators A: Counterexamples to generation and another condition for well posedness. Springer-Verlag Lecture Notes in Mathematics(1984), 227-233. Proceedings of Workshop on Operator-Semigroups and Applications, University of Graz, Retzholf (Austria) June 1983.

Finite rank, relatively bounded perturbations of C0-semigroups, Part I: Well posedness and boundary feedback hyperbolic dynamics (with I. Lasiecka), Annali Scuola Normale Superiore di Pisa (IV) XII(4)(1985), 641-668.

Improving stability properties of hyperbolic damped equations by boundary feedback,Springer-Verlag Lecture Notes75 (1985), 400-409. Proceedings of Workshop on Control Theory for Partial Differential Equations and Applications, University of Graz (Austria), July 1984. (Also, Proceedings of CDC Conference, held in Las Vegas, December 1984.)

Finite rank, relatively bounded perturbations ofC0-semigroups, Part II: Spectrum allocation and Riesz basis in parabolic and hyperbolic feedback systems (with I. Lasiecka), Annali Matem. Pura Appl. (IV) CXLIII (1986), 47-100.

Riccati equations for hyperbolic partial differential equations with L2(Σ)-Dirichlet boundary terms(with I. Lasiecka), SIAM J. Control Optimiz. 24 (1986), 884-926.

Non homogeneous boundary value problems for second order hyperbolic operators (with I. Lasiecka and J. L. Lions), J. Math. Pures Appl. 65 (1986), 149-192.

A direct study of Riccati equations arising in boundary control problems for hyperbolic equations (with G. Da Prato and I. Lasiecka), J. Diff. Eqns. 64 (1986), 26-47.

Exponential uniform energy decay rates of the wave equation in a bounded region with L2 (0, T;L2(Γ)-boundary feedback in the Dirichlet B.C. (with I. Lasiecka), J. Diff. Eqns. 66 (1987), 340-390.

The regulator problem for parabolic equations with Dirichlet boundary control, Part I: Riccati'-s feedback synthesis, and regularity of optimal solutions (with I. Lasiecka), Appl. Math. Optimiz. 16(1987), 147-168.

The regulator problem for parabolic equations with Dirichlet boundary control, Part II: Galerkin approximation (with I. Lasiecka), Appl. Math. Optimiz. 16 (1987), 187-216.

Exact boundary controllability of L2(Ω)×H−1(Ω) of the wave equation with Dirichlet boundary control acting on a portion of the boundary and related problems, Appl. Math. Optimiz. 18(1988), 241-277. (Also, preliminary version in Springer-Verlag Lecture Notes 102 (1987), 291-332; Proceedings of Workshop on Control for Distributed Parameter Systems, University of Graz, Austria (July 1986)).

Proof of two conjectures of G. Chen and D. L. Russell on structural damping for elastic systems: The case α= 1/2 (with S. Chen), Springer- Verlag Lecture Notes in Mathematics 1354 (1988), 234-256. Proceedings of Seminar on Approximation and Optimization, University of Havana, Cuba (January 1987).

A lifting theorem for the time regularity of solutions to abstract equations with unbounded operators and applications to hyperbolic equations (with I. Lasiecka), Proceedings American Mathematical Society 103 (1988), 745-755.

Algebraic Riccati Equations with non-smoothing observation arising in hyperbolic and Euler-Bernoulli boundary control problems (with F. Flandoli and I. Lasiecka), Annali Matem. Pura Appl.(IV) CLM (1988), 307-382. (Preliminary version in Infinite Horizon Quadratic Cost Boundary Control Problems (with I. Lasiecka), Proceedings, CDC Conference, Los Angeles, CA, December 1987).

Exact controllability of the Euler-Bernoulli equation with L2(Σ)-control only in the Dirichlet boundary condition (with I. Lasiecka), Rendiconti Accademia Nazionale dei Lincei, Rome, Italy, Classe Sci. Fis. Matem. LXXXI (1988).

Wave equation on a bounded domain with boundary dissipation: An operator approach, J. Math. Anal. Appl. 137 (1989) 438-461. (Also, preliminary versions in Operator Methods for Optimal Control Problems, Sung J. Lee (editor), Marcel Dekker (1988), pp. 283; Lecture Notes Pure Appl. Math. 108, 283-310; Proceedings of Special Session of the Annual Meeting of the American Mathematical Society, New Orleans, LA (1986)).

Exact boundary controllability for the wave equation with Neumann boundary control (with I. Lasiecka), Appl. Math. Optimiz. 19 (1989), 243-290. (Also, preliminary version in Springer-Verlag Lecture Notes 100 (1987), 316-371.)

Trace regularity of the solutions of the wave equation with homogeneous Neumann boundary conditions and compactly supported data (with I. Lasiecka), J. Math. Anal. Appl. 141 (1989), 49-71.

Proof of extensions of two conjectures on structural damping for elastic systems: The case 1/2≤α≤1 (with S. Chen),Pacific J. Math. 136 (1989), 15-55.

Exact controllability of the Euler-Bernoulli equation with controls in the Dirichlet and Neumannboundary conditions: A non-conservative case (with I. Lasiecka),SIAM J. Control Optimiz.27(1989), 330-373. (Also, preliminary version in Semigroups and Applications, Marcel Dekker Lecture Notes116 (1988), 241-261.)

Regularity theory for a class of nonhomogeneous Euler-Bernoulli equations: A cosine operator ap-proach (with I. Lasiecka), Bollettino Unione Matem. Ital.(7)3-B (1989), 199-228. (Also, invitedpaper for special volume,Topics in Mathematical Analysis, volume dedicated to A. L. Cauchy,T. M. Rassias (editor), World Scientific (1989), 623-657).

Lack of uniform stabilization for non-contractive semigroups under compact perturbation,ProceedingsAmer. Math. Soc.105 (1989), 375-383.

Exact controllability for wave and Euler-Bernoulli equations in the presence of damping, 30 Yearsof Modern Optimal Control, Lecture Notes Pure Appl. Math. 119 (1989) 377-387, Marcel Dekker.(Also,Diff. Eqns. Appl.III (1989), 454-463, Ohio University Press.)

Exact controllability of the Euler-Bernoulli equation with boundary controls for displacement andmoment (with I. Lasiecka), J. Math. Anal. Appl.146 (1990), 1-33. (Also, invited paper for specialvolume,Topics in Mathematical Analysis, volume dedicated to A. L. Cauchy, T. M. Rassias (editor), World Scientific (1989), 576-622).

Finite rank, relatively bounded perturbations of semi-group generators, Part III: A sharp result onthe lack of uniform stabilization,Diff. Int. Eqns.3 (1990), 503-522. (Also, preliminary version in Proceedings INRIA Conference, Paris, France (June 1988), Springer-Verlag Lecture Notes.)

Sharp regularity for mixed second order hyperbolic equations of Neumann type Part I: TheL2-boundary case (with I. Lasiecka),Annali Matem. Pura Appl.(IV) CLVII (1990) 285-367. (An-nouncements in Accad. Lincei, LXXXIII (1989), 109-113, Classe di Scienze Matematiche, Rome, Italy, and Springer-Verlag Lecture Notes, 114.)

Gevrey class semigroups arising from elastic systems with gentle perturbation (with S. Chen),Proceedings Amer. Math. Soc.110 (1990), 401-415.

Characterization of domains of fractional powers of certain operators arising in elastic systems, andapplications (with S. Chen),J. Diff. Eqns. 88 (1990), 279-293.

Further results on exact controllability of the Euler-Bernoulli equation with control in the Dirich-let/Neumann boundary conditions (with I. Lasiecka), Springer-Verlag Lecture Notes, LNCIS147 (1990), 226-235, J. P. Zolesio (editor).

Exact controllability of semi-linear abstract systems with application to wave and plate problems(with I. Lasiecka), Appl. Math. Optimiz., 23 (1991), 109-154.

Uniform energy decay rates for Euler-Bernoulli equations with feedback operators in the Dirich-let/Neumann B.C. (with J. Bartolomeo),SIAM J. Math. Anal.22 (1991), 46-71. (Announcement in Rendiconti Accademia Nazionale dei Lincei, Rome, Italy,Classe Sci. Fis. Matem.(8) LXXXIII(1989), 121-128.)

Regularity theory of hyperbolic equations with non-homogeneous Neumann boundary conditions, Part II: General boundary data (with I. Lasiecka), J. Diff. Eqns. 94 (1991), 112-164.

Uniform stabilization of the Euler-Bernoulli equation with feedback only in the Neumann boundary conditions (with N. Ourada), Diff. Int. Eqns. 4 (1991), 277-292.

Regularity of structurally damped systems with point/boundary control, J. Math. Anal. Appl. 161(2)(1991), 299-331.

Numerical approximations of algebraic Riccati equations for abstract systems modelled by analytic semigroups, and applications (with I. Lasiecka), Math. Computation 57(196) (1991), 639-662 and Supplement 513-537.

Exact controllability and uniform stabilization of Euler-Bernoulli equations with only one active control in ∆w|Σ, (with I. Lasiecka), Bollettino Unione Matem. Ital. (7)5-B (1991), 665-702. (Also, invited paper for special volume dedicated to C. Caratheodory, T. M. Rassias (editor), World Scientific.)

Differential Riccati equations with unbounded coefficients: applications to boundary control/boundary observation hyperbolic problem (with I. Lasiecka), J. Nonlinear Anal. 17(7) (1991), 655-682. (Also, invited paper for special volume dedicated to E. F. Gauss, T. M. Rassias (editor), World Scientific 9.)

Exact controllability and uniform stabilization of Kirchhoff plates with boundary controls only in ∆w|Σ (with I. Lasiecka), J. Diff. Eqns. 93 (1991), 62-101. (Preliminary version in -Semigroup and Evolution Equations,- Marcel Dekker Lectures Notes Pure Appl. Math. 135, 267-295.)

Lack of exact controllability for wave and plate equations with finitely many boundary controls, Diff. Int. Eqns. 4 (1991) 683-705.

Riccati differential equations with unbounded coefficients and non-smoothing terminal condition: The case of analytic semigroup (with I. Lasiecka), SIAM J. Math. Anal. 25 (1992), 449-481.

Uniform stabilization of the wave equation with Dirichlet or Neumann-feedback control without geometrical conditions (with I. Lasiecka), Appl. Math. Optimiz. 25 (1992), 189-224. (Preliminary version in Springer-Verlag Lecture Notes LNCIS 147, 62-108, J. P. Zolesio (editor).)

Optimal regularity, exact controllability and uniform stabilization of the Schr-odinger equation (with I. Lasiecka), Diff. Int. Eqns. 5 (1992), 521-535.

Constructive steering control functions for linear systems and abstract rank conditions, J. Optimiz. Theory Appl. 74(2) (August 1992), 347-367.

Counterexamples to some stability questions for dissipative generators, J. Math. Anal. Appl. 170 (1992), 49-64.

Regularity with point control. Part III: Schrodinger equations, J. Math. Anal. Appl. 171 (1992), 567-577.

Uniform Convergence of Solutions to Riccati equations arising in boundary/point control problems (with I. Lasiecka), Springer Verlag Lecture Notes LNCIS 184 (1992), 285-305.

Interior and boundary regularity of the wave equations with point control, Diff. Int. Eqns. 6 (1993), 111-129. (Announcement in Accademia Nazionale dei Lincei, Rome, Italy, Matem. Appl. II(4) (1991), 307-315.)

Interior regularity with point control: Euler-Bernoulli equations, Springer Verlag Lecture Notes LNCIS 79, 321-355, J. P. Zolesio (editor).

Regularity with point control. Part II: Kirchhoff equations, J. Diff. Eqns. 103 (1993), 394-420.

Algebraic Riccati Equations arising from systems with unbounded input solution operator: Applications to boundary control problems for wave and plate problems (with I. Lasiecka), J. Nonlinear Anal. 20 (1993), 659-695. (Prelimary version in Springer-Verlag Lecture Notes LNCIS 180, 530-538. Proceedings of EFIP Conference, held in Zurich, Sept. 2-5, 1991.)

Sharp trace estimates of solutions to Kirchhoff and Euler-Bernoulli equations (with I. Lasiecka), Appl. Math. Optimiz. 28, (1993), 277-306. (Preliminary version in Marcel Dekker Lectures Notes Pure Appl. Math. 148. Proceedings of International Conference of Evolution Equations in Banach Space, held at University of Bologna, Italy (July 1991), 141-180.)

Analytic and Gevrey class semigroups generated by −A + iB, and applications (with A. Favini) Marcel Dekker Lectures Notes Pure Appl. Math. 148 (1993). Proceedings of International Conference on Evolution Equations in Banach Space, held at University of Bologna, Italy, July 1991, 148 (August 1993), 93-114. (Announcement appeared in Accademia Nazionale dei Lincei, Rome, Italy, Sezione Matematica, 1992).

Min-Max game theory and algebraic Riccati equations for boundary control problems with continuous input-solution map. Part I: The stable case (with C. McMillan), Marcel Dekker Lectures Notes Pure Appl. Math. 155 (1994). Proceedings of International Conference/Workshop in Evolution Equations in Banach Space, held in Han-sur-Lesse, Belgium, October 1991, Ph. Clement and G. Lumer (editors), 372-405.

Min-Max game theory and algebraic Riccati equations for boundary control problems with continuous input-solution map, Part II: The general case (with C. McMillan), Appl. Math. Optimiz. 29 (1994), 1-64. (Announcement appeared in Differential Equations with Applications to Mathematical Physics, Academic Press (1992), 239-49 and in Springer-Verlag LNICS.

Min-Max game theory and algebraic Riccati equations for boundary control problems with analytic semigroups, Part I: The stable case (with C. McMillan), Marcel Dekker Lecture Notes Pure Appl. Math. 152 (1994), 757-780, invited paper for special volume (Festschrift), in honor of L. Markus on the occasion of his 70th birthday.

Min-Max game theory and algebraic Riccati equations for boundary control problems with analytic semigroups. Part II: The general case (with C. McMillan), J. Nonlinear Anal. 22 (1994) 431-465.

An optimal quadratic boundary control problem for wave and plate-like equations with high internal damping: An abstract approach, Marcel Dekker Lecture Notes Pure Appl. Math. 165 (1994), 215-271. International Conference on Optimal Control for Partial Differential Equations, University of Trento, January 1993.

Lack of generation of strongly continuous semigroups by the damped wave operator on H - H (with A. V. Balakrishnan), Appl. Math. Letters 6 (1993), 33-37.

Optimal boundary control and new Riccati equations for highly damped second order equations, Diff Int. Eqns. 7 (1994), 1109-1144. Invited paper for special volume in memory of Peter Hess.

Further regularity properties of the optimal pair in quadratic cost problems for parabolic equations with boundary control and non-smoothing final state penalization (with I. Lasiecka), Marcel Dekker Lectures Notes Pure Appl. Math. 160 (1994), 173-190. International Conference on Optimal Control of Differential Equations and Calculus of Variations, Ohio University, March 1993.

On the relationship between the optimal control quadratic problem on an infinite horizon and on a finite horizon with final state penalization: The abstract hyperbolic case, Marcel Dekker Lectures Notes Pure Appl. Math. 160 (1994), 301-325. International Conference on Optimal Control of Differential Equations and Calculus of Variations, Ohio University, March 1993.

A sharp result on the exponential operator-norm decay of a family of s.c. semigroups, Semigroup Forum 49 (1994), 387-395.

Abstract model and semigroup well-posedness of spherical shells with boundary dissipation (with I. Lasiecka), invited paper in Dynamical Sys. Appl. 4 (1995), 453-471, World Scientific Series in Applicable Analysis.

Uniform stabilization of spherical shells by boundary dissipation (with I. Lasiecka and V. Valente), Advances Diff. Eqns. 1 (1996) 635-674. (Also, preliminary version in Marcel Dekker Lectures Notes Pure Appl. Math. 176 (1996), 171-181.

Carleman estimates and uniqueness for the system of strongly coupled PDE-s of spherical shells (with I. Lasiecka), special volume of Zeits. Angerwandte Math. Mech. (ZAMM), Akademie Verlag, Berlin, ICIAM 1995, 76(4) (1996), 277-280.

Regularity theory, exact controllability and optimal quadratic cost problem for spherical shells with physical boundary controls, invited paper in special issue of Control and Cybernetics, Polish Academy of Sciences, Control Problems Part. Diff. Eqns. 259(3) (1996), 553-569.

A singular control approach to highly damped second order abstract equations and applications (with I. Lasiecka and L. Pandolfi), Appl. Math. Optimiz. 36 (1997), 67-107. (Also, preliminary version in Marcel Dekker Lectures Notes Pure Appl. Math. 176 (1996), 157-170. Proceeding of Conference on Control of Partial Differential Equations, Laredo, Spain, September 1994.)

An optimal control problem with unbounded control operator and unbounded observation operator where the Algebraic Riccati Equation is satisfied as a Lyapunov equation, Appl. Math. Letters 10 (1997), 95-102.

Carleman estimates and exact boundary controllability for a system of coupled, nonconservative second order hyperbolic equations (with I. Lasiecka), Marcel Dekker Lectures Notes Pure Appl. Math. 188 (1997), 215-245, invited paper for the special volume Partial Differential Equations Methods in Control and Shape Analysis.

Carleman estimates and exact boundary controllability for a system of coupled non-conservative Schr-odinger equations, invited paper for special volume of Rendiconti dell- Istituto di Matematica dell- Universita di Trieste XXVIII (1996), 453-504. Supplemento, invited paper for special volume in memory of Pierre Grisvard.

An abstract setting for differential Riccati equations in optimal control problems for hyperbolic/Petrowski-type PDE-s with boundary control and slightly smoothing observation, Abstract Appl. Anal. 1 (1996), 435-484.

Exact controllability for second-order hyperbolic equations with variable coefficients-principal part and first-order terms (with I. Lasiecka and P. F. Yao), Non-Linear Anal. Theory Meth. Appl. 30 (1997), 111-122.

Analyticity, and lack thereof, of semigroups arising from thermo-elastic plates, special volume Computational Science for the 21st Century, John Wiley (1997), invited paper for a conference in honor of R. Glowinski, May 1997.

Analyticity, and lack thereof, of thermo-elastic semigroups (with I. Lasiecka), European Soc. Appl. Math. (ESAIM) 4 (1999), 199-222.

The Algebraic Riccati equation with unbounded control operator: The abstract hyperbolic case revisited, American Mathematical Society, Contemporary Mathematics, special volume Optimization Methods in Partial Differential Equations 209 (1997), 315-338.

Control problems in noise reduction: the case of two hyperbolic equations, Math. Contr. Smart Structures, SPIE 3039 (1997), 382-392.

Two direct proofs on the analyticity of the s.c. semigroup arising in abstract thermo-elastic equations (with I. Lasiecka), Advances Diff. Eqns. 3(3) (May 1998), 387-416.

Spectral analysis of thermo-elastic plates with rotational forces (with S. K. Chang), in Optimal Control: Theory, Algorithms, and Applications, Kluwer (1998), 84-115.

Exact null controllability of structurally damped and thermo-elastic parabolic models, (with I. Lasiecka), invited paper (Memoria), Accademia Nazionale dei Lincei, Mathematics Section, Rome, Italy, IX(1) (1998), 43-69.

Analyticity of thermo-elastic semigroups with coupled hinged/ Neumann B.C. (with I. Lasiecka), Abstract Appl. Anal. 3(1-2) (1998), 153-169.

Analyticity of thermo-elastic semigroups with free B.C. (with I. Lasiecka), Annali Scuola Normale Superiore, Pisa, Cl. Sci. (4), XXVII (1998), 457-482.

Sharp regularity of a coupled system of a wave and a Kirchoff equation with point control arising in noise reduction (with M. Camurdan), Diff. Int. Eqns. 12(1) (January 1999), 101-118.

High level interior and boundary regularity results of the Euler-Bernoulli equation with application to Differential Riccati Equations in optimal control, Numer. Funct. Anal. Optimiz. 20(3&4) (1999), 367-386.

Sharp regularity theory for thermo-elastic mixed problems, Applicable Analysis 77(3-4) (2001), 419-433. [Reprint of an electronically faulty version in 73(3-4) (1999), 557-572.]

A sharp trace result on a thermo-elastic plate equation with coupled hinged/Neumann boundary conditions (with I. Lasiecka), Discrete Cont. Dynam. Sys. 5 (July 1999), 585-598.

Finite element compensators for thermo-elastic systems with boundary control and point observation (with S. K. Chang and I. Lasiecka), Num. Funct. Anal. Optimiz. 20(5&6) (1999), 419-435.

An observability estimate in L2(Ω) - H−1 (Ω) for second order hyperbolic equations with variable coefficients (with I. Lasiecka and P. F. Yao), Control of Distributed Parameter and Stochastic Systems, Kluwer (1999), 71-79, S. Chen, X. Li, J. Yong, and X. Zhou (editors).

Uniform stability of non-linear thermo-elastic plates with free boundary conditions (with G. Avalos and I. Lasiecka), International Series of Numerical Mathematics, Birkh-auser 133 (1999), 13-32.

Inverse observability estimates for second order hyperbolic equations with variable coefficients (with I. Lasiecka and P. F. Yao), J. Math. Anal. Appl. 235 (July 1999), 13-57.

Inverse/observability estimates for Schr-odinger equations with variable coefficients (with P. F. Yao), invited paper, special volume on Control of Partial Differential Equations, Polish Academy of Sciences 28(3) (1999), 627-664.

Exact boundary controllability of a first order non-linear hyperbolic equation with non-local integral term arising in epidemic modeling (with I. Lasiecka), Direct and Inverse Problems of Mathematical Physics, R. P. Gilbert, J. Kajiwara, Y. Xu (editors), Kluwer (2000), 363-398. ISAAC-97, The First International Congress of the International Society for Analysis, its Applications and Computations.

Structural decomposition of thermo-elastic semigroups with rotational forces (with I. Lasiecka), Semigroup Forum 60 (2000), 16-66.

Feedback noise control in an acoustic chamber: Mathematical theory (with I. Lasiecka), Nonlinear Problems in Aviation and Aerospace, Gordon and Breach Science Publishers (2000), 89-111. S. Siva (editor), Vol. 11, Stability and Control: Theory Methods and Applications, 1999.

Extended algebraic Riccati equations in the abstract hyperbolic case (with V. Barbu and I. Lasiecka), Nonlinear Anal. 40(1-8) (2000), 105-130, Elsevier, invited paper for special issue in honor of Lakshmikantham.

Nonconservative wave equations with unobserved Neumann B.C.: Global uniqueness and observability (with I. Lasiecka and X. Zhang), AMS Contemp. Math., Vol. 268 (2000), 227-326.

Simultaneous exact/approximate boundary controllability of thermoelastic plates with variable thermal coefficient and moment control (with M. Eller and I. Lasiecka), J. Math. Anal. Appl. 251 (2000), 452-478.

A sharp trace regularity result of Kirchof and thermo-elastic plate equations with free boundary conditions (with I. Lasiecka), Rocky Mount. J. Math. 30(3) (2000), 981-1023.

Factor spaces and implications on Kirchoff elastic and thermoelastic systems with clamped boundary conditions (with I. Lasiecka), Abstract & Appl. Analysis, Vol. 6(8) (2001), 1-48. Preliminary announcement in Oberwolfach Proceedings -Control of Complex Systems, Kluwer.

Sharp regularity of the second time derivative wtt of solutions to Kirchhoff elastic equations with clamped boundary conditions (with I. Lasiecka), Int. J. Appl. Math. 11(44) (2001), 753-773.

Simultaneous exact/approximate boundary controllability of thermoelastic plates with variable coefficient (with M. Eller and I. Lasiecka), Marcel Dekker Lecture Notes Pure and Applied Mathematics 216 (February 2001), 109-230, invited paper for the special volume entitled Shape Optimization and Optimal Designs, J. P. Zolesio (Editor). [Preliminary version, is in invited paper in Semigroup of Operators and Applications, Birkhauser (2000), 335-351, A. V. Balakrishnan (editor).]

Backward uniqueness for thermoelastic plates (with I. Lasiecka and M. Renardy), Semigroup Forum 62 (2001), 217-242.

Simultaneous exact/approximate boundary controllability of thermoelastic plates with variable thermal coefficient and clamped controls (with M. Eller and I. Lasiecka), Discrete Cont. Dynam. Sys. 7(2) (2001), 283-301.

Unique continuation for over-determined Kirchoff plate equations and related thermoelastic systems (with M. Eller and I. Lasiecka), J. Inv. Ill-Posed Prob. 9(2) (2001), 1-46.

Optimal control and algebraic Riccati equations under singular estimates for e AtB in the absence of analyticity. Part I: The stable case (with I. Lasiecka), Marcel Dekker, Lecture Notes in Pure and Applied Mathematics, Vol. 225 (2002), 193-219, S. Aizicovici & N. Pavel (Editors).

Min-max game theory and optimal control with indefinite cost under a singular estimate for e AtB in the absence of analyticity, invited paper in memory of B. Terreni, Evolution Equations, Semigroups and Functional Analysis, Birkh-auser (2002), 353-380, A. Lorenzi & B. Ruf (Editors).

Singular estimates and uniform stability of systems of coupled hyperbolic/parabolic PDEs (with F. Bucci, I. Lasiecka), Abstract and Applied Analysis, Vol. 7(4) (2002), 169-237.

Uniform stabilization of a shallow shell model with nonlinear boundary feedback (with I. Lasiecka), J. Anal. & Appl., Vol. 269(2) (2002), 642-688.

Carleman estimates with no lower order terms for general Riemannian wave equations. Global uniqueness and observability in one shot (with P. F. Yao), Appl. Math. & Optimiz. 46(2-3) (2002), 331-375.

Carleman estimates for a plate equation on a Riemannian manifold with energy level terms (with I. Lasiecka and P. F. Yao), Analysis and Applications, Kluwer (2003), 199-236. H. Begehr, R. Gilbert, and M. W. Wang (Editors).

Optimal estimates of norms of fast controls in exact null controllability of two non-classical abstract parabolic systems, Advances in Diff. Eqns., Vol. 8(2) (2003), 189-229.

The coupled PDE system of a composite (sandwich) beam, Discr. & Contin. Dynam. Systems B, Vol. 3(2) (2003), 285-298.

The case for differential geometry in the control of single and coupled PDEs: The structural acoustic chamber (with R. Gulliver, I. Lasiecka, and W. Littman). IMA Volumes in Mathematics and its Applications, volume 137: Geometric Methods in Inverse Problems and PDE Control, Springer Verlag (2003), 73-181.

L2(Σ)-regularity of the boundary → boundary operator B∗L for hyperbolic and Petrowski PDEs (with I. Lasiecka), Abstract & Applied Analysis, Vol. 19 (2003), 1061-1139.

Global uniqueness, observability and stabilization of non-conservative Schr-odinger equations via pointwise Carleman estimates. Part I: H1 (Ω)-estimates (with I. Lasiecka and X. Zhang), J. Inverse & Ill-Posed Problems, Vol. 12(1) (2004), 1-81.

Global uniqueness, observability and stabilization of non-conservative Schr-odinger equations via pointwise Carleman estimates. Part II: L2(Ω)-estimates (with I. Lasiecka and X. Zhang), J. Inverse & Ill-Posed Problems, Vol. 12(2) (2004), 182-231. Preliminary announcement in Analysis and Optimization of Differential Systems, Kluwer (2003), 235-246.

Backward uniqueness of semigroups arising in coupled PDE systems of structural acoustics, Advances in Diff. Eqns., Vol. 8(1-2) (Jan.-Feb. 2004), 53-84. Preliminary announcement in Semigroups of Operators: Theory and Applications (2002), 285-300. C. Kubrusly, N. Levan, M. da Silveira (editors).

Optimal control and differential Riccati equations under singular estimates for e AtB in the absence of analyticity (with I. Lasiecka). Invited paper in honor of A. V. Balakrishnan, Advances in Dynamics and Control, Chapman and Hall/CRC (2004), Chapter 19, 271-307.

Internal stabilization of Navier-Stokes equations with finitely many controllers (with V. Barbu), Indiana Univ. Math. J. 53(5) (2004), 1443-1494.

The operator B∗L for the wave equation with Dirichlet control (with I. Lasiecka), Abstract and Applied Analysis, Vol. 2004, Issue 7, 625-634.

The dual algebraic Riccati equations: Additional results under isomorphism of the Riccati operator, Appl. Math. Letters 18 (2005), 1001-1008.

Global exact controllability on H1 Γ0 (Ω) - L2(Ω) of semilinear wave equations with Neumann L2(0, T;L2(Γ1))-boundary control, Control Theory for Partial Differential Equations, CRC Lecture Notes in Pure & Applied Mathematics, Vol. 242, Chapter 19, 271-334, May 2005.

Global exact controllability of semilinear wave equations by a double compactness/uniqueness argument (with I. Lasiecka), Discrete & Continuous Dynamical Systems, Supplement Volume (June 2005), 556-565.

Boundary stabilization of Navier-Stokes equations (with V. Barbu and I. Lasiecka), Memoirs AMS, 128 pp., Vol. 181, N. 852, May (2006).

Abstract settings for tangential boundary stabilization of Navier-Stokes equations by high- and lowgain feedback controllers (with V. Barbu and I. Lasiecka), Nonlinear Analysis 64(12) (June 2006), 2705-2746.

Well-posedness and uniform decay rates at the L2(Ω)-level of Schr-odinger equations with nonlinear boundary dissipation (with I. Lasiecka), J. Evol. Eqns. 6 (2006), 485-537.

Stability enhancement of a 2-D linearized Navier-Stokes channel flow by finite-dimensional, wallnormal boundary controllers, with arbitrarily small support, 39 pp., Discrete & Continuous Dynamical Systems B, 8(2) (2007), 279-314.

Pointwise Carleman estimates, global uniqueness, observability and stabilization for non-conservative Schr-odinger equations on Riemannian manifolds at the H1 (Ω)-level (with X. Xu), AMS Contemporary Math. 426 (March 2007), 339-404.

Sharp regularity of hyperbolic-dominated thermoelastic systems with point control: The hinged case, J. Math. Anal. & Appl., 333 (2007), 530-542.

The coupled PDE-system arising in fluid-structure interaction. Part I: Explicit semigroup generator and its spectral properties (with G. Avalos), AMS Contemporary Mathematics, Fluids and Waves 440 (2007), 15-55.

Sharp regularity of hyperbolic-dominated thermoelastic systems with point control: The clamped case, Discr. & Cont. Dynam. Systems 2007 (special) (September 2007), 993-1004.

Local exponential stabilization strategies of the Navier-Stokes equations, d = 2, 3, via feedback stabilization of its linearization (with V. Barbu and I. Lasiecka), Optimal Control of Coupled Systems of Partial Differential Equations, Oberwolfach, Birkhauser ISNM 155 (2007), 13-46.

Exact controllability in L2(Ω) of the Schr-odinger equation in a Riemannian manifold with L2(Σ1)-Neumann boundary control (invited paper) in: Functional Analysis and Evolution Equations (2008), 613-636. Special volume dedicated to the memory of G-unter Lumer; H. Amann, W. Arendt, J. von Below, M. Hieber, F. Neubrander, and S. Nicaise, editors, Birkh-auser Verlag.

The role of an L2(Ω)-energy level estimate in the theories of uniform stabilization and exact controllability for Schr-odinger equations with Neumann boundary control, Bol. Soc. Paran. Math. 25(1-2) (2007), 109-138. Invited paper, Inter. Conference on PDEs, State University of Maringa, Brazil, September 2007.

Mathematical analysis of PDE systems which govern fluid-structure interaction (with G. Avalos), Bol. Soc. Paran. Math. 25(1-2) (2007), 109-138. Invited paper, Inter. Conference on PDEs, State University of Maringa, Brazil, September 2007.

The critical case of clamped thermoelastic systems with interior point control: Optimal interior and boundary regularity results, J. Diff. Eqns. 245(12) (2008), 3764-3805.

Uniform stabilization of a coupled PDE system arising in fluid-structure interaction with boundary dissipation at the interface (with G. Avalos), Discr. & Cont. Dynam. Systems, 22(4) (2008), 817-833 (invited paper).

Backward uniqueness of the s.c. semigroup arising in parabolic-hyperbolic fluid-structure interaction (with G. Avalos), J. Diff. Eqns. 245 (3) (2008), 737-761.

Higher regularity of a coupled parabolic-hyperbolic fluid-structure interactive system (with G. Avalos and I. Lasiecka), invited paper, special issue of Georgian Mathematical Journal 15(3) (2008), 403-437; dedicated to the memory of J. L. Lions; J. Mawhin, editor.

Linear hyperbolic and Petrowski-type PDEs with continuous boundary control → boundary observation open loop map: Implications on nonlinear boundary stabilization with optimal decay rates (with I. Lasiecka), 187-276. Invited paper in Sobolev Spaces in Mathematics: Applications of Functional Analysis in Mathematical Physics, International Mathematical Series, Vol. 8, Springer Verlag (2008), dedicated to the centenary of Sergey Sobolev.

Uniform energy decay rates of hyperbolic equations with nonlinear boundary and interior dissipation (with I. Lasiecka), invited paper for special issue C&C, Control Journal of Polish Academy of Sciences in honor of J. P. Zolesio, 37(4) (2008), 932-966.

Linear independence of boundary traces of eigenfunctions of elliptic and Stokes Operators and applications, invited paper for special issue, Applicationes Mathematicae 35(4) (2008), 481-512, Institute of Mathematics, Polish Academy of Sciences.

Semigroup well-posedness in the energy space of a parabolic-hyperbolic coupled Stokes-Lam-e PDE system (with G. Avalos), Discr. & Cont. Dynam. Systems DCDS-S 2(3) (2009), 417-448.

Boundary feedback stabilization of a coupled parabolic-hyperbolic Stokes-Lam-e PDE system (with G. Avalos), J. Evol. Eqns. 9 (2009), 341-370.

Unique continuation from an arbitrary interior subdomain of the variable-coefficient Oseen equation, Nonlinear Analysis, Theory, Meth. & Appl. 17 (2009), 4967-4976.

Beyond lack of compactness and lack of stability of a coupled parabolic-hyperbolic fluid-structure system (with G. Avalos and I. Lasiecka), International Series of Numerical Mathematics, Vol. 158, Birkh-auser Verlag, Basel, Switzerland (2009), pp. 1-33 (Oberwolfach Conference).

Unique continuation of boundary over-determined Stokes and Oseen eigenproblems, Discr. & Cont. Dynam. Systems, DCDS-S (invited paper) 2(3) (2009), 645-678.

Optimal regularity and optimal control of thermoelastic structural acoustic model with point control and clamped boundary conditions (with C. Lebiedzik), invited paper, special issue C&C, Control Journal of Polish Academy of Sciences entitled, -50 Years of Optimal Control Theory,- Part B, 38 (2009), 1461-1500.

Min-max game theory and non-standard differential Riccati equations under singular estimates for e AtB and e AtG in the absence of analyticity (with J. Zhang), Set-Valued and Variational Analysis, Springer-Verlag, Vol. 17 (2009), 245-283.

A coupled parabolic-hyperbolic Stokes-Lam-e PDE system: Limit behavior of the resolvent operator on the imaginary axis (with G. Avalos), Applicable Analysis, Vol. 88(9) (2009), 1357-1396.

Backward uniqueness of the C0-semigroup associated with a parabolic-hyperbolic coupled StokesLam-e PDE system (with G. Avalos), Trans. Amer. Math. Soc. 362 (2010), 3535-3561.

A hidden gain of regularity on the strongly damped abstract wave equation: Implications on the nonlinear model, invited paper in Advances in Theory, Methods and Applications in Dynamics and Control, Chapter 8, a felicitation volume in honor of A. V. Balakrishnan, Cambridge (2011), 97-106.

The optimal interior regularity for the critical case of a clamped thermoelastic system with point control revisited (with C. Lebiedzik), modern Aspects of the Theory of PDEs. Vol. 216 of Operator Theory: Advances and Applications, 243-259, Birkh-auser/Springer, Basel, 2011. M. Ruzhansky and J. Wirth, eds.

A fluid structure interaction model with both control and disturbance at the interface: A game theory problem via an abstract approach (with I. Lasiecka and J. Zhang), Applicable Analysis, special issue, 90(5-6) (May-June 2011), 961-999.

Global uniqueness and stability in determining the damping coefficient of an inverse hyperbolic problem with non-homogeneous Neumann B.C. through an additional Dirichlet boundary trace (with S. Liu), SIAM J. Math. Analysis, 43(4) (2011), 1631-1666.

Min-max game theory and nonstandard differential Riccati equations for abstract hyperbolic-like equations, J. Nonlinear Analysis, Series A, special issue, 75 (2012), 1572-1591.

Global uniqueness and stability in determining the damping and potential coefficients of an inverse hyperbolic problem (with S. Liu), Nonlinear Analysis, Series B 12 (2011), 1562-1590.

Global uniqueness in determining electric potentials for a system of strongly coupled Schr-odinger equations with magnetic potential terms (with S. Liu), J. Inverse Ill-Posed Prob., 25 pp., 9(2) (June 2011), 223-254.

Recovery of damping coefficients for a system of coupled wave equations: Uniqueness and stability (with S. Liu), Chinese Annals Math., Series B, 35 pp., 32(5) (Sept. 2011), 669-698.

Determining damping and potential coefficients of an inverse problem for a system of two coupled hyperbolic equations. Part I: Global uniqueness (with S. Liu), Discr. & Cont. Dynam. Sys., suppl. (2011), 1001-1014.

An abstract semigroup approach to the third-order Moore-Gibson-Thompson PDE-equation arising in high-intensity ultrasound: Structural decomposition, spectral analysis, exponential stability (with R. Marchand and T. McDevitt), Math. Methods in Appl. Science 35 (2012), 1896-1929, invited paper, special issue in honor of R. Gilbert-s 80th birthday.

Global uniqueness and stability in determining the damping coefficient of an inverse hyperbolic problem with non-homogeneous Dirichlet BC, through an additional localized Neumann boundary trace (with S. Liu), Applicable Analysis 91(8) (2012), 1551-1581, invited paper, special issue on Direct & Inverse Problems for PDEs.

Recovering damping and potential coefficients for an inverse non-homogeneous econd-order hyperbolic problem via a localized Neumann boundary trace (with S. Liu), invited paper for special issue of Discr. & Cont. Dynamical Systems, Discrete Contin. Dyn. Sysy. 33 (2013), 5217-5252.

An inverse problem for a third order PDE arising in high-intensity ultrasound: Global uniqueness and stability by one boundary measurement (with S. Liu), Journal of Inverse and Ill-Posed Problems 21 (2013), 825-869. Invited paper for a special issue dedicated to academician M. M. Levrentiev.

Rational decay rates for a PDE heat-structure interaction: A frequency domain approach (with G. Avalos), Evolution Equations and Control Theory 2 (2013), 233-253.

Fluid-structure interaction with and without internal dissipation of the structure: a contrast study in stability (with G. Avalos). Evol. Equ. Control Theory 2 (2013), no. 4, 563–598.

Uniform Stabilization with Arbitrary Decay Rates of the Oseen Equation by Finite-Dimensional Tangential Localized Interior and Boundary Controls (with I. Lasiecka), Springer Proceeding in Math. series, Semigroup and Operators and Appl., 2015, 125 – 154.

Inverse Problem for a Linearized Jordan-Moore-Gibson-Thompson Equation (with S. Liu), New Prospects in Direct, Inverse, and Control Problems for Evolution Equations (Favini, et al., Edis.), Chapter 15 (2014), 305–351, Springer-INDAM series.

Stabilization to an equilibrium of the Navier-Stokes equations with tangential action of feedback controllers (with L. Lasiecka), Nonlinear Analysis, 121 (2015), 424–446.

Global uniqueness and stability in determining the magnetic potential coefficient of an inverse problem for Schrodinger equations on Riemannian manifolds (with Z. Zhang),Journal of Inverse and Ill-posed Problems, Vol 23, Issue 6 (2015), 587–610.

Domain of Fractional Powers of Matrix-valued Operators: A General Approach (with I. Lasiecka),invited paper,Operator Semigroups meet Complex Analysis, Harmonic Analysis and Mathematical Physics, Birkauser, Volume 250, dedicated to C. Batty (2015), 297–311.

Heat-Structure Interaction with Viscoelastic Damping: Analyticity with Sharp Analytic Sector, Exponential Decay, Fractional Powers (with I. Lasiecka), Communic. in Pure & Applied Analysis, Vol15, N5 (2015), 1515–1543.

Heat-Wave Interaction in 2-3 Dimensions: Optimal Rational Decay Rate (with G. Avalos and I. Lasiecka),J. Math. Analy. & Appl., Vol 437, Issue 2 (2016), 782–815.

A Heat-Viscoelastic Structure Interaction model with Neumann and Dirichlet Boundary control at the interface: Optimal Regularity, Control Theoretic implications,Applied Mathematics & Optimization,Vol 73, N3 (2016), 571–594, Issue by invitation in memory of A. V. Balakrishnan.

A matrix-valued generator A with strong boundary coupling: a critical subspace of D((-A)1/2) and D((-A*)1/2) and implications, Evol. Eqts. & Control Theory, Vol 5, N1 (2016) 185–199.

Sharp regularity theory of second order hyperbolic equations with Neumann boundary control non-smooth in space,Evolution Equations and Control Theory, Vol 5, N4 (2016), 489–514.

Domains of fractional powers of the heat-structure operator with visco-elastic damping: regularity and control-theoretic implication, J. Evolution Equations, Vol 17, Issue 1 (2017), 573–597.

Heat-Viscoelastic plate interaction: analyticity, spectral analysis, exponential decay (with J. Zhang), Evolution Equations and Control Theory, Vol 1, N 1 (2017), 153–182.

Heat-Viscoelastic plate interaction via bending moments and shear forces operators: analyticity, spectral analysis, exponential decay, Appl. Math. & Optimiz, 82(2) (2020), 755–797.

Sharp interior and boundary regularity of the SMGTJ equation with either Dirichlet or Neumann boundary control (invited paper), Semigroups of Operators: Theory and Applications, Springer proceedings in Mathematics and Statistics, Vol 325, (2020), 379-426.

Uniform stabilization of Boussinesq System in critical Lq-based Sobolev and Besov spaces: by finite dimensional interior localized feedback controls (with I. Lasiecka and B. Priyasad), Special Issue Discr. & Cont. Dynam. Systems-Series B (2020), 25(10): 4071-4117. doi: 10.3934/dcdsb.2020187

Unique Continuation Properties of Over-determined static Boussinesq Eigenproblems with Application to Uniform Stabilization of Dynamic Boussinesq Systems (with X. Wan), Appl. Math. & Optimiz 84 (2021)., 2099–2146. https://doi.org/10.1007/s00245-020-09705-z

Uniform stabilization of Navier-Stokes equations in critical Lq-based Sobolev and Besov spaces, by finite dimensional interior localized feedback controls (with I. Lasiecka and B. Priyasad), Appl. Math. & Optimiz 83, 1765–1829 (2021).

Maximal Lp-regularity for an abstract evolution equation with applications to closed-loop boundary feedback control (with I.Lasiecka and B. Priyasad), Journal of Differential Equations, 294 (2021): 60–87.

Uniform Stabilization of 3D Navier–Stokes Equations in Low Regularity Besov Spaces with Finite Dimensional, Tangential-Like Boundary, Localized Feedback Controllers (with I. Lasiecka and B. Priyasad), Archive of Rational Mechanics and Analysis 241, 1575–1654 (2021).

Fluid-Structure Interaction with Kelvin-Voight Damping: analyticity, spectral analysis, exponential decay, (with R. Mahawattege) Appl. Math. & Optim., 84 (2021), 1821–1863. https://doi.org/10.1007/s00245-021-09812-5

The SMGT equation equation from the boundary: regularity and stabilization (with M. Bongarti and I. Lasiecka) Applicable Analysis, (2021): 1-39.

Finite dimensional boundary uniform stabilization of the Boussinesq system in Besov spaces by critical use of Carleman estimate-based inverse theory (with I.Lasiecka and B.Priyasad), J. of Inverse and Ill-posed Problems. vol. 30, no. 1, 2022, pp. 35-79. https://doi.org/10.1515/jiip-2020-0132

From Low to High – and Lower – Optimal Regularity of the SMGTJ Equation with Dirichlet and Neumann Boundary Control, and with Point Control, via Explicit Representation Formulae (with X. Wan), Evol Eqts and Control Theory, to appear, 27 pages.

Optimal feedback arising in a third order dynamics with boundary control and infinite horizon, (with I.Lasiecka), Journal of Optimization Theory and Applications, submitted.

Uniqueness of the Riccati operator of the non-standard ARE of a third order dynamics with boundary control (with I. Lasiecka), in preparation.

Creative/Artistic Works

Algebraic Riccati equations arising in boundary/point control: a review of the theoretical and numerical results: Part 1: continuous case (with I. Lasiecka), Perspectives in Control Theory, Birkhäuser (1990), 175–210.

Algebraic Riccati equations arising in boundary/point control: A review of the theoretical and numerical results: Part II: Approximation theory (with I. Lasiecka), Perspectives in Control Theory, Birkhäuser (1990), 210–235.

Recent advances in regularity of second-order hyperbolic mixed problems, and applications (with I. Lasiecka), invited paper for Book Series, Dynamics Reported, Springer-Verlag, 3 (1994), 104–158.

Min-max game theory and H∞-problems for partial differential equations with boundary/point control and disturbance. INRIA-IFIP Conference, held at Universite de Technologie de Compiegne, France, July 1993, Springer-Verlag Lecture Notes 197 (1994), 70–89.

Presentations - Conference (refereed *)

Main speaker, Workshop on Control Theory and Inverse Problems, University of Bari, Italy, July 18-22, 2022.

Invited speaker (25 min) Mini-symposium on fluid-structure interactions and related problems, SIAM Conference on Analysis of PDEs, March 14-18, 2022, Berlin, Germany (remotely via Zoom).

Main speaker (45 min) at the International Symposium on Frontier Issues of Mathematics Theory of Nonlinear Systems, Henan Normal University, China, Dec 11, 2021 (remotely via Zoom).

One of four main lecturers (each giving four 50-min lectures) invited to lecture at the summer school "Fluids under Controls", held in Prague, August 24-28, 2021. In the framework of the Prague-Sum series of summer schools and workshops organized since 2011 in cooperation between Czech Technical University in Prague, the Institute of Mathematics of the Czech Academy of Sciences and the University of Pittsburgh (remotely via Zoom).

Invited (30 m) speaker at Minisymposium on "Control of PDEs with an Interface", SIAM Annual Meeting, July 2021 (remotely via Zoom).

One-hour talk at the Spring semester 2021, MSRI Berkeley, Program in Mathematical Problems in Fluid dynamics, May 2021 (remotely via Zoom).

Main (50 m) speaker at IV Workshop on PDEs held at Institute of Bio & Exact Sciences, San Paulo State University, San Jose do Rio Preto, Brazil, March 2021 (held remote via zoom).

Invited (45 m) speaker at the 2020 American Math. Society, Fall Sectional Meeting, Modern Applied Analysis Special Session, University of Tennessee, Chattanooga, Oct 2020 (held remotely via zoom).

Main (50 m) invited speaker at the International Video-Workshop on infinite dimensional Dynamical Systems, held at Donghua University, Shanghai, China, Sept 2020 (held remotely via zoom).

Invited (30-40 m) speaker at the 2020 American Math. Society, Fall Sectional Meeting, University of Texas, El Paso, Sept 2020. Postponed because of Covid-19.

One of five major lecturers giving a 4-hour course at the Second Summer Worksop of PDEs and Dynamical Systems, College of Mathematics and Information Sciences, Henan Normal University, China, July 2020, held remotely via zoom.

Invited (55 m) plenary speaker at the ETAMM20 conference (Emerging Trends in Applied Mathematics & Mechanics), Ostrava-Poruba, Czech Rebublic, Originally scheduled for June 2020; postponed to June 2021, and finally cancelled because of Covid-19.

Invited speaker at Special Session SS12, "Control and Optimization: new developments and applications", AIMS Conference in Dynamical Systems, Differential Equations and Applications, to be held in Atlanta, US, June 5-9, 2020.

Plenary (one hour) speaker at Special Session on PDEs: Analysis & Control, held at American University of Sharjah, United Arab Emirates, February 2020. Declined because of Covid-19.

Invited speaker at 2019 SIAM Control States Section 5th Annual Meeting, Iowa State University, Ames, IO, October 19-20, 2019.

Main (55 min) speaker at XVIII Workshop in PDEs, WPDE2019, Petropolis, Rio de Janeiro, Brazil, September 10-13, 2019.

Plenary speaker at 9th Congress of the Romanian Mathematicians, held at Galati, Romania, June 28-July 3. Declined.

One of two main lecturers (along with I. Lasiecka, University of Memphis) of 8 hours lectures in the stabilization of Navier-Stokes equations, given at the Faculty of Mathematics and Information Sciences of the Warsaw University of Technology, June 2019.

One of the main lectures (along with A. Fursikov, Moscow State University; Glowinskin, Math Department, University of Houston; and I. Lasiecka, University of Memphis) invited to lecture at the summer school ``Fluids under Controls'', to be held in Prague, August 24--28, 2020. In the framework of the Prague-Sum series of summer schools and workshops organized since 2011 in cooperation between Czech Technical University in Prague, the Institute of Mathematics of the Czech Academy of Sciences and the University of Pittsburgh.

Invited speaker at Special Session SS12, ``Control and Optimization: new developments and applications'', AIMS Conference in Dynamical Systems, Differential Equations and Applications, to be held in Atlanta, US, June 5-9, 2020.

Invited speaker at 2019 SIAM Control States Section 5th Annual Meeting, Iowa State University, Ames, IO, October 19--20, 2019.

Main (55 min) speaker at XVIII Workshop in PDEs, WPDE2019, Petropolis, Rio de Janeiro, Brazil, September 10--13, 2019.

Plenary speaker at 9th Congress of the Romanian Mathematicians, held at Galati, Romania, June 28--July 3. Declined.

Main speaker (1 hour), Semigroups of Operators, Theory, and Applications, Banach Center, Kazimierz Dolny, Poland, Sep. 30-Oct. 5, 2018.

IFIP Conference on control theoretic properties of evolutionary PDEs, Essen, Germany, July 24-27, 2018.

Invited speaker (30 min) at American Math. Society, Portland State University, Apr. 14-15, 2018. 

Invited speaker (30 min) at SIAM Conference Analysis of Partial Differential Equations, Baltimore, Dec. 9-12, 2017.

Invited speaker (30 min) at American Math Society, University of Central Florida, Orlando, Sep. 2017.

Main speaker in two presentations (of 50 min each) at the Conference of Nonlinear PDEs in Applied Mathematics, Izmir Institute of Technology, Turkey, Aug. 8-11, 2017.

Main speaker (50 min) at Third International Conference on Probability and Analysis, to be held May 15-19, 2017, Bedlewo, Poland (declined).

Main speaker (40 min) at Conference ``Partial Differential Equations and Applications'', to be held at the University of Bologna, Italy, May 22-26, 2017 (declined).

Invited speaker (30m) at American Math Society, College of Charleston, SC, March 10-12, 2017.

Invited talk (30m) at American Math Society Meeting, North Carolina State Univ., Raleigh, Nov. 11-12 2016.

Main lecturer (one of four: three from US, one from Austria), at Seminar 2016 on Mathematical Theory for Fluid-Flow Structure Interaction, Oberwolfach (Germany), Nov. 20-26, 2016. One 60 minute lecture/day for 5 days.

Invited speaker for a thematic PDE session at the Joint Brazil-Italy Meeting organized by IMPA (Brazil) and CNR (Italy), Rio de Janeiro, Aug 26-30, 2016 (Declined due to conflict with Izmir’s meeting).

Plenary speaker (one of four), 50 minutes, at the Conference of Nonlinear PDE’s in Applied Mathematics, Izmir Institute of Technology, Turkey, Aug. 28-30, 2016.

Invited lecture (30 min), OCERTO 2016 - Optimal Control for Evolutionary PDE’s, Cortona, Italy, June 20-14, 2016.

Plenary speaker (one of eight), 50 minutes, at the Conference on Dynamical Systems and Applications, Institute of Mathematics, Technical University of Lodz, Poland, June 16-18, 2016.

Invited talk (30 min) at specialized session of International    Conference    on    Evolution    Equations, Vanderbilt University, Nashville, May 16-20, 2016.

Invited talk (30 min) at specialized session of Amer. Math. Soc. Meeting at State Univ. of New York at Stony Brooks, March 19-20, 2016.

Invited speaker at mini-symposium, Siam Conference on Partial Differential Equations, Scottsdale, Arizona, December 7-10, 2015.

Invited speaker at mini-symposium, AMS Sectional Meeting, University of Memphis, Oct 17-17, 2015.

Main invited speaker (50m) at XIV Workshop in Partial Differential Equations, LNCC Petropolis, Brazil, Sep. 22--25, 2015.

SIAM Conference on control & its Applications, Paris, July 8-10, 2015.

Invited speaker, New advances  in PDEs, Inverse Problems and Control Theory, University of Parma July 6-10, 2015.

Invited speaker at mini-symposium on ``Well-posedness, Control and Observability theories for PDEs",  27th IFIP Conference on System Modeling and Optimization, Sophia Antipolis, France, June 19-July 3, 2015.

17th British-French-German conference on Optimization, Imperial College, June 15-17, 2015.

International Workshop ``From Open to Closed Loop Control", University of Graz, Austria, June 21-16, 2015.

Invited speaker at Special Session on Nonlinear elliptic and parabolic PDEs, AMS Sectional meeting, University of Nevada, Las Vegas, April 18-19, 2015.

Invited speaker, mini-symposium, The 9th IMACS International Conference on Nonlinear Evolution Equations and Wave Phenomena, University of Georgia, Athens, GA, April 1-4, 2015.

Mini-symposium on Inverse Problems, SIAM Regional Conference, University of Alabama, Birmingham, March 20-22, 2015.

Invited speaker at Special Session ``Nonlinear PDEs in Science and Engineering" AMS Sectional Meeting, Georgetown University, March 7-8, 2015.

Invited(50 minutes) main speaker, Shanks Workshop on Mathematical Aspects of Fluid Dynamics, Vanderbilt University, February 28 - March 1, 2015.

Invited speaker, PDEs, Inverse Problems and Control Theory 2014, University of Bologna, Italy, September, 2014.

Invited speaker at two special sessions, AIMS Conference on Dynamical Systems, Differential Equations and Applications, Madrid, July 7-11, 2014.

Invited main speaker at conference, Recent Trends in Nonlinear Partial Differential Equations and Applications, to be held at Department of Mathematics, University of Trieste, Italy, May 28--30, 2014.

Invited speaker at two specialized sessions (SS 5A Harmonic Analysis and Nonlinear Partial Differential Equations, and SS 19A Nonlinear PDEs in the Applied Sciences) of American Mathematical Society meeting, University of Tennessee, Knoxville, TN, March 21--23, 2014.

Invited speaker, specialized session, SIAM Conference on Analysis of Partial Differential Equations, Orlando, FL, Dec.~2013.

Main invited speaker, Conference on Semigroups of Operators, Banach  Center, Bedlewo, Poland, October 4--8, 2013.

Invited speaker, Workshop on Partial Differential Equations, IMPA, Rio de Janeiro, Brazil, Sept. 10-14, 2013.

Invited speaker, special session, ISAAC Conference, Krakow, Poland, Aug. 6-10, 2013.

Invited speaker, Partial Differential Equations, Control Theory, and Inverse Problems, Cortona, Italy, June 18--22, 2013.

Invited speaker, Conference on Inverse Problems, University of Central Florida, Orlando, May 2013 (declined).

Invited speaker, special session, Conference on PDE, University of Georgia, March 2013 (declined). 

Invited speaker, special session, Conference on PDE, U. of Georgia, March 2013 (declined).

Invited speaker, Conference on Inverse Problems, University of Central Florida, Orlando, May 2013 (declined).

Conference in Aero-elasticity, UCLA, November 20-21, 2012.

Conference on Applied Analysis and Math-Biology (AAMB), University of Delaware, August 8-9, 2012.

Third bi-annual -Palestinian Conference on Modern Trends in Mathematics and Physics,- July 16-18, Palestine Polytechnic in Hebron, Palestine.

Specialized session, -Analysis, Optimization, and Control of Nonlinear Partial Differential Equations, 9th AIMS Conference, Orlando, FL, July 1-5, 2012.

Plenary speaker, -Inverse Problems of Mathematical Physics,- 5th International Conference on Inverse Problems and Modeling, Lykia World and Links Golf Antalya, Turkey, May 21-26, 2012.

Plenary speaker, 4th International Workshop, -Variational Analysis and Applications,- School of Mathematics, G. Stampacchia, Erice (Sicily), May 14-22, 2012

Special session, -Control Theory and Inverse Problems,- joint mathematics meeting, January 2012, Boston.

Special session, -Control of Biological and Physical Systems,- joint mathematics meeting, January 2012, Boston.

Main one-hour plenary speaker, -International Conference on Numerical Analysis and Optimization,- KFUPM, Dhahran, Saudi Arabia, December 17- 20, 2011.

Workshop on Optimal Control for PDEs,- Chemitz, Germany, November 28-December 2, 2011

Specialized session, -SIAM Conference on Analysis of PDEs,- San Diego, CA, November 14-17, 2011.

Conference on Evolution Equations: Randomness and asymptotics,- Karlsruhe, Germany, October 2011.

Workshop on Control and Optimization of PDEs,- Graz, Austria, October 10-14, 2011.

Specialized session, -IFIP Conference,- Technical University of Berlin, Germany, September 12-16, 2011.

Workshop on PDEs and Applications,- Federal University of Para, Belem-Brazil, August 29-September 1, 2011.

Principal lecturer (six one-hour lectures) at -Trimestre on Nonlinear Hyperbolic PDEs, Dispersive and Transport Equations,- SISSA-IAS, Trieste, Italy, May 16-20, 2011.

Workshop on Control of PDEs,- SISSA, Trieste, Italy, May 24-28, 2001.

Special session, -Optimization Control and Inverse Problems for PDEs,- AMS Annual Meeting, New Orleans, January 2011.

Special session, -Control and Inverse Problems for PDEs,- AMS Annual Meeting, New Orleans, January 2011.

Main speaker, -Analysis Day,- KFUPM, Saudi Arabia, December 27, 2010.

Special session, AMS Meeting, University of Richmond, November 5-6, 2010.

International Conference on Evolution Equations,- Schmitten, Germany, October 11-15, 2010.

PDEs, Semigroup Theory and Inverse Problems,- University of Bologna, Italy, September 1-14, 2010.

Special session in PDEs, ICNPAA 2010 World Congress, INPE, S-ao Jose dos Campos, Brazil, June 30-July 3, 2010.

Special session, -8th AIMS Conference on Dynamical Systems, Differential Equations and Applications,- Dresden, Germany May 25-28, 2010.

Harmonic Analysis and PDEs,- University of Nebraska-Lincoln, April 16-18, 2010.

Special session, -Nonlinear Hyperbolic Equations and Control Systems in Physics and Engineering,- annual AMS meeting, San Francisco, January 13-16, 2010.

Main one-hour speaker at international conference, -Recent Advances in Mathematical Sciences and Applications RAMSA09,- Visakhapatnam, India, December 19-22, 2009.

Special session, -SIAM Conference on Analysis of Partial Differential Equations,- Miami, Florida, December 7-10, 2009.

Special session IFIP Conference on Systems Modelling and Optimization, Buenos Aires, Argentina, July 27-31, 2009.

Special session at ISAAC (International Society of Applied Analysis and Computation), Imperial College, London, July 13-16, 2009.

International Conference on Nonlinear Parabolic Problems, in honor of H. Amann, May 10-16, 2009, Banach Center, Bedlewo, Poland.

Special Session on Nonlinear Partial Differential Equations, AMS meeting, San Francisco State University, April 25-26, 2009.

Workshop in honor of Professor A. V. Balakrishnan, University of California, Los Angeles, Jan. 30-31, 2009.

Special Session, AMS Meeting, Western Michigan University, Kalamazoo, October 17-19, 2008.

International Workshop, -Direct, Inverse and Control Problems for PDEs,- Cortona, Italy, September 22-27, 2008.

International Conference, -50 Years of Optimal Control,- Banach Center, Poznan, Poland, September 15-22, 2008.

International Workshop on Partial Differential Equations, Institute of Mathematics, Federal University of Rio de Janiero, Brazil, August 26-29, 2008.

Special Session -Control, Stabilization, and Long-Time Behavior of Nonlinear Evolutionary PDE Systems,- at 5th World Congress in Nonlinear Analysis, July 2-9, 2008.

Special Session -Control and Optimization in PDEs,- International Conference -Differential Equations and Topology,- in commemoration of the 100th anniversary of L. S. Pontryagin (1908-1988), Moscow, Russia, June 17-22, 2008.

Speaker (and organizer) at AIMS International Conference on -Dynamical Systems, Differential Equations and Applications, University of Texas, Arlington, May 18-21, 2008.

International Workshop Optimal Control of Coupled Systems of PDEs, Oberwolfach, Germany, March 2-8, 2008.

International Conference on Partial Differential Equations, State University of Maringo, Brazil, Sept. 3-7, 2007.

VI Workshop on Partial Differential Equations, Rio de Janiero, August 28-31, 2007.

International Conference on Theoretical and Numerical Fluid Mechanics, Vancouver, Canada, August 13-17, 2007.

First AMS-PTM Joint Meeting, Special Session on -Control and Optimization of Nonlinear PDE Systems,- Warsaw, Poland, July 31-August 3, 2007.

Special Session on -Control and Optimization of Nonlinear Evolutionary PDE Systems,- 23rd IFIP TC7 Conference, Cracow, Poland, July 23-27, 2007.

International Workshop on -Direct, Inverse and Control Problems for PDEs,- Natikonal Institute of Higher Mathematics (INDAM), University of Rome, Italy, June 25-28, 2007.

Main speaker, First World Congress in Applied Mathematics, Lima, Peru, Jan. 7-14, 2007.

Main speaker at conference, Advances in Control of Partial Differential Equations, Univ. of Maryland, Baltimore County, Oct. 28-29, 2006.

International Conference on Applied Analysis and Differential Equations, U. of Iasi, Romania, September 2006.

International Conference on Inverse and Direct Problems, U. of Bologna, Italy, September 2006.

Speaker at two special sessions, International Conference on Differential Equations and Dynamical Systems, Poitier, France, July 2006.

International Conference on Nonlinear Problems in Mathematical Physics, Ankare (Turkey), end of April 2006.

AMS meeting, Specialized Session on Harmonic Analysis and PDEs, Miami, FL, April 2006.

International Conference on Inverse and Control Problems for PDEs, March 13-17, 2006, Rome, Italy.

Main speaker (50 min) at International Conference on Evolution Equations with Applications, in memory of G. Lumer; Luminy (near Marsaille), France, October 24-28, 2005.

Main speaker (50 min) at International Conference in Differential Equations, Florida Technological Institute, Melbourne, FL, August 4-8, 2005.

Main speaker (50 min), AMS-IMS-SIAM Summer Research Conference, Snowbird Resort, Utah, July 2-7, 2005.

Workshop on Inverse Problems, U. of North Carolina, Charlotte, June 3-6, 2005.

Main invited speaker (50 min) at IFIP Conference in -Free and Moving Boundaries,- Math Department, University of Houston, Dec. 2-6, 2005.

Speaker at 2 special sessions, International Conference in Differential Equations and Dynamical Systems, Pomona College, California, June 2004.

AMS Conference, Special Session on Evolution Equations, Bowling Green, Kentucky, March 2004.

International Workshop, Scuola Normale Superiore, Pisa, Italy, Feb. 26-28, 2004.

Main speaker at International Conference on PDEs, Iguassu Falls, Brazil, Dec. 16-19, 2003

Main plenary speaker and invited speaker at specialized session 21st IFIP Conference on Systems Analysis and Optimization, Sophia Antipolis, France, July 21-25, 2003.

Special session, 5th Romannian Congress of Mathematicians, University of Pitesti, Romania, June 2003.

Main speaker at Conference Control Theory for Partial Differential Equations, Georgetown University, on the occasion of the retirement of J. Lagnese, May 30-June 1, 2003.

Main speaker, University of Minnesota, September 21-22, 2002.

Main speaker at International Conference in Analysis and Optimization of Differential Systems, Ovidius University, Constanta, Romania, September 9-14, 2002.

Special session, SIAM Conference, Philadelphia, Pennsylvania, July 8-12, 2002.

Speaker at two special sessions of the First American Math Society-Italian Math Society Meeting, Pisa, Italy, June 11-16, 2002.

Main speaker at conference, Evolution Equations and Applications, held at Cortona, Italy, April 15-19, 2002.

Main invited address, Amer. Math. Soc. meeting, Chattanooga, TN; October 5-6, 2001.

Main speaker at SOTA2 (Semigroup of Operators, Theory and Applications), Rio de Janeiro, Brazil, September 8-14, 2001.

ISAAC Conference, invited speaker at specialized session, Berlin, Germany, August 20-25, 2001.

Main speaker, Institute of Mathematics and its Applications, University of Minnesota, July 2001.

International Conference on Inverse and Direct Problems, Gargnano, Italy, April 1-6, 2001.

Workshop on Control Theory of Partial Differential Equations, University of Nebraska, Lincoln, NE, April 2001.

Special session at American Mathematical Society meeting, University of Kansas, April 2001.

Conference on Differential Equations (main speaker) in memory of Brunello Terreni, University of Milano, Italy, September 28-29, 2000.

IMACS, Lausanne, Switzerland, August 2000.

Control of Partial Differential Equations, Oberwolfach, Germany, June 2000.

IFIP Conference on Control of Distributed Systems (main speaker), Ekaterinburg, Russia, June 2000.

International Workshop on Differential Equations and Optimal Control (main speaker), Ohio University, May 2000.

AMS Annual Meeting, Specialized Session on Geometric Methods in Control of PDE-s, Washington, DC, January 2000.

Control of Nonlinear Distributed Parameter Systems (main speaker), Texas A&M, October 22-24, 1999.

AMS Meeting at U. of North Carolina at Charlotte (invited speaker at specialized session), October 16-17, 1999.

NSF-CBM Conference, University of Nebraska, Lincoln, August 4-9, 1999.

IFIP Conference, Cambridge University, England (invited speaker at specialized session), July 12-16, 1999.

ICIAM 1999, Edinburgh, Scotland (invited speaker at specialized session), July 5-9, 1999.

Differential Geometric Methods in the Control of PDE, University of Colorado, Boulder (main speaker), June 27-July 2, 1999.

AMS Meeting at University of Nevada, Las Vegas (invited speaker at specialized session), April 10-11, 1999.

First International Conference on Semigroups of Operators: Theory and Applications (main speaker), Los Angeles, December 14-18, 1998.

Third International Symposium on Methods and Models in Control Theory, Miedzyzdroje, Poland, August 1998.

IFIP Conference, Zhejiang University, Hangzhou, China, June 1998.

Nonlinear Problems in Avionics, Embrie-Riddle, May 1998, Daytona Beach, Florida.

IFIP Conference, Chemitz, Germany, April 1998.

CIMAT International Conference on Dynamics and Control of PDE, Mexico, November 29-30, 1997.

Fourth International Symposium on Methods and Models in Control Theory, Miedzyzdroje, Poland, August 1997.

ERP Conference (Session: Modeling, Analysis and Control of Partial Differential Equations), Detroit, July 1997.

The International Society for Analysis, its Applications and Computations (ISAAC), University of Delaware, June 1997.

Conference in INRIA, Paris, France, May 1997, in honor of R. Glowinski.

Mathematics, Modeling and Control for Smart Materials and Structures, San Diego, California, March 1997.

IFIP Conference Optimal Control Theory: Theory, Algorithms, and Applications, Mathematics Department, University of Florida, Gainesville, FL, February 1997.

Fifth International Conference on Evolution Equations, Hiroshima, Japan, October 27-31, 1996.

International Workshop on Boundary Control and Inverse Problems, Euler Institute of Mathematics, St. Petersburg, Russia, July 1996 (declined).

International Workshop on Control and Estimation of Partial Differential Equations, Vorau, Austria, July 1996 (declined).

Second World Contress in Non-Linear Analysis, (Two 1-hour invited talks), Athens, Greece, July 1996.

International Conference in Applied Analysis, University of the Aegean, Mathematics Department, Samos Island, Greece, July 1996.

Mathematical Theory of Systems, St. Louis, Missouri, June 1996.

AMS Summer Research Conference on Optimization Methods for Partial Differential Equations, Mount Holyoke College, Massachusetts, June 1996.

First International Conference on Nonlinear Problems in Avionics and Aerospace, Embry-Riddle Aeronautical University, Daytona Beach, FL, May 9-11, 1996.

1995 SIAM Annual Conference, Charlotte, NC, October 1995.

Third European Control Conference, Rome, Italy, September 1995.

IMP Workshop on Modeling and Optimization for Partial Differential Equations, Warsaw, Poland, July 1995.

IFIP Conference, Prague, Czech Republic, July 1995.

ICIAM (International Conference of Industrial and Applied Mathematics), Hamburg, Germany, July 1995.

4th International Conference on Evolution Equations, Scuola Normale Superiore, Pisa, Italy, September 1994.

IFIP Conference on Control Theory of Partial Differential Equations, Laredo, Spain, September 1994.

4th International Colloquium on Differential Equations, Bulgaria, August 1994

Conference on Control Theory for Partial Differential Equations and Applications, Virginia Polytechnic Institute, April 1994.

IFIP Conference, Boundary Control and Boundary Variation, Rabot, Morocco, December 1993 (declined).

Third International Colloquium on Differential Equations, Bulgaria, August 1993.

Plenary Speaker, IFIP Conference, Control of Partial Differential Equations, Compiegne, France, July 1993.

International Conference on Partial Differential Equations, Oberwolfach, Germany, May 1993.

International Conference on Optimal Control of Differential Equations and Variational Inequalities, Ohio University, March 1993.

Special Session at American Mathematical Society Annual Meeting in San Antonio, Texas, January 1993 (declined, being in Europe).

International Conference on Partial Differential Equations, Oberwolfach Germany, January 1993 (declined).

International Conference on Control Theory for Partial Differential Equations, University of Trento, Italy, January 1993.

Workshop on Control Theory for Partial Differential Equations, Institute of Mathematics and Its Applications, University of Minnesota, November 1992.

Special Session at American Mathematical Society Annual Meeting in Dayton, Ohio, October 1992 (declined, being in Europe).

SIAM Conference on Control Theory for Differential Equation, Minneapolis, Minnesota, September 1992.

First World Congress in Non Linear Analysis, Tampa, Florida, August 1992 (declined, being in Europe).

International Conference on State Space and Frequency Domain Techniques for Infinite Dimensional Systems, INRIA, France, June 1992.

International Workshop in Boundary Control and Boundary Variation, Sophie-Antipolis, France, June 1992.

International Conference on Partial Differential Eqns., Oberwolfach Germany, May 1992 (declined).

Presentations - Universities/Industry (refereed *)

Colloquium talk (50 min) at Math department, Vanderbilt University, February 28, 2019.

Colloquium talk (50 min) at Math department, Florida International University, Nov. 1, 2018.

Colloquium talk at Math Dept, Florida Inst. of Tech, April 27, 2018.

Four one-hour lectures at Koc University, Istanbul, Turkey, July 2011.

Colloquium, Dept. of Math and Statistics, KFUPM, Saudi Arabia, January 6, 2011.

Summer School of Mathematics,- State University of Maring-a, Brazil, March 1-5, 2010.

Main lecturer of a one-week mini-course at the Winter Semester in Nonlinear Analysis, Mathematics Institute of the Federal University of Rio de Janeiro, Brazil, Aug. 3-8, 2009.

Seminar, Scuola Normale Superiore, Pisa, Italy, March 10, 2008.

Colloquium talk, SUNY at Binghamton, November 15, 2007.

Colloquium talk, Wichita State University, November 2, 2007.

Seminar in Partial Differential Equations, U. of Nebraska, Lincoln, March 2007.

Math Colloquium, U. of Nebraska, Lincoln, March 3, 2006.

Twelve-hour lectures delivered at Winter School on Transport Equation and Control Theory for PDEs, Bressanone, Italy, Jan. 12-17, 2004.

Mittag-Leffler Institute, Semester on Mathematical Control and System Theory, February 2003.

Colloquium, Math. Department, University of Brescia, Italy, May 2002.

A few lectures on geometric methods in control of PDEs, Scuola Normale Superiore, Pisa, Italy, April-May 2002.

Seminar lectures at Scuola Normale Superiore, Pisa, Italy, July 1998.

Series of lectures on A-priori Inequalities for Hyperbolic and Petrowski-type Partial Differential Equations, Scuola Normale Superiore, Pisa, Italy, June 1997.

Colloquium, Mathematics Department, George Mason University, Fairfax, VA, March 1996.

Colloquium, Mathematics Department, Virginia Polytechnic Institute and State University, Blacksburg, VA, March 1996.

Colloquium, University of Minnesota, Minneapolis, March 1995.

Institute of Applied Analysis, Picone, Rome, June-July 1994.

Colloquium, Mathematics Department, Polytechnic of Torino, Italy, July 1993.

Colloquium, Mathematics Department, University of Bologna, Italy, July 1993.

Colloquium, Scuola Normale Superiore, Pisa, Italy, July 1993.

School of Mathematics, University of Minnesota, Spring 1993.

Series of Lectures, Mathematics Department, University of Trento, October-December 1992.

Colloquium, Mathematics Department, University of Pavia, Italy, December 1992.

Colloquium, Mathematics Department, University of L-Aquila, Italy, December 1992.

Colloquium, Mathematics Department, University of Torino, Italy, July 1992.

Colloquium, Mathematics Department, University of Bologna, Italy, July 1992.

Colloquium, Mathematics Department, Scuola Normale Superiore Pisa, Italy, July 1992.

Other Presentations (refereed *)

Plenary (50 m) speaker (one of six) at the International Workshop in Operator Theory and its Applications, Chapman University, Calif., August 8-13, 2021 (remotely via Zoom).

Appendix B