Kim Dang Phung
This paper deals with the approximate controllability for the semilinear heat equation in one space dimension. Our aim is to provide an estimate of the cost of the control.
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In this paper we establish several results on approximate controllability of a semilinear wave equation by making use of a single multiplicative control. These results are then applied to discuss the exact controllability properties for the one dimensional version of the system at hand. The proof relies on linear semigroup theory and the results on the additive controllability of the semilinear wave equation. The approaches are constructive and provide explicit steering controls. Moreover, in the context of undamped wave equation, the exact controllability is established for a time which is un…
We study several controllability properties for some semilinear parabolic PDE with a quadratic gradient term. For internal distributed controls, it is shown that the system is approximately and null controllable. The proof relies on the Cole-Hopf transformation. The same approach is used to deal with initial controls.
Partially Exact Controllability of Semilinear Heat Exchanger Systems
本文研究了单管和双流热交换器系统的半精确可控性问题，通过定义状态空间的子空间实现系统的精确可控性。
In this article, we are discussing a more vital concept of controllability, termed total controllability. We have considered a nonlocal semilinear functional evolution equations with non-instantaneous impulses and finite delay in Hilbert spaces. A set of sufficient conditions of total controllability is obtained for the evolution system under consideration, by imposing the theory of C_0-semigroup and Banach fixed point theorem. We also established the total controllability results for a functional integro-differential equation. Finally, an example is given to demonstrate the feasibility of der…
Global null controllability of stochastic semilinear complex Ginzburg-Landau equations
本文通过改进的全局 Carleman 估计处理带 $L^2$ 值源项的随机线性系统，并结合 Banach 不动点方法，证明了正、倒向随机半线性复 Ginzburg-Landau 方程的全局零能控性。
This paper deals with the problem of internal null-controllability of a heat equation posed on a bounded domain with Dirichlet boundary conditions and perturbed by a semilinear nonlocal term. We prove the small-time local null-controllability of the equation. The proof relies on two main arguments. First, we establish the small-time local null-controllability of a $2 \times 2$ reaction-diffusion system, where the second equation is governed by the parabolic operator $τ\partial_t - σΔ$, $τ, σ> 0$. More precisely, this controllability result is obtained uniformly with respect to the parameters $…
In this paper we are concerned with the approximate controllability of a multidimensional semilinear reaction-diffusion equation governed by a multiplicative control, which is locally distributed in the reaction term. For a given initial state we provide sufficient conditions on the desirable state to be approximately reached within an arbitrarily small time interval. Moreover, in the case of a globally supported control, we prove the approximate controllability within any time-interval given in advance which does not depend on the initial and target states. Our approaches are based on linear …
Inspired in our work on the controllability for the semilinear with memory \cite{Carrasco-Guevara-Leiva:2017aa, Guevara-Leiva:2016aa, Guevara-Leiva:2017aa}, we present the general cases for the approximate controllability of impulsive semilinear evolution equations in a Hilbert space with memory and delay terms which arise from reaction-diffusion models. We prove that, for each initial and an arbitrary neighborhood of a final state, one can steer the system from the initial condition to this neighborhood of the final condition with an appropriated collection of admissible controls thanks to th…
Null controllability for semi-discrete stochastic semilinear parabolic equations
本文研究空间有限差分离散的随机半线性抛物型方程零能控性，通过显式给出Carleman参数与离散化参数并结合Banach不动点方法证明其成立。
This article is devoted to study the interior approximated controllability of the strongly damped semilinear wave equation with memory, impulses and delay terms. The problem is challenging since the state equation contains memory and impulsive terms yielding to potential unbounded control sequences steering the system to a neighborhood of the final state, thus fixed point theorems cannot be used directly. As alternative, the A.E Bashirov and et al. techniques are applied and together with the delay allow the control solution to be directed to fixed curve in a short time interval and achieve ou…
Approximate controllability of impulsive semilinear evolution equations in Hilbert spaces
本文利用不动点方法和半群理论，为Hilbert空间中半线性脉冲及中立型微分方程建立了近似可控性的新充分条件，并通过三个例子验证了其改进效果。
Controllability for semi-discrete semilinear stochastic parabolic operators
本文研究了任意维度下半离散半线性随机抛物算子的可控性，通过建立新的Carleman估计和固定点论证，证明了ϕ-零可控性。
Boundary Regional Controllability of Semilinear Systems Involving Caputo Time Fractional Derivatives
针对含Caputo时间分数阶导数的半线性系统，在近似区域边界可控性假设下，利用分数幂和不动点技术证明边界区域可控性的充分条件，并提出算法和数值模拟验证。
We study the existence and approximate controllability of a class of fractional nonlocal delay semilinear differential systems in a Hilbert space. The results are obtained by using semigroup theory, fractional calculus, and Schauder's fixed point theorem. Multi-delay controls and a fractional nonlocal condition are introduced. Furthermore, we present an appropriate set of sufficient conditions for the considered fractional nonlocal multi-delay control system to be approximately controllable. An example to illustrate the abstract results is given.
In this paper, we apply the hierarchical strategy to a semilinear weakly degenerate parabolic equation involving a gradient term. We use the Stackelberg-Nash strategy with one leader which tries to drive the solution to zero and two followers intended to solve a Nash equilibrium corresponding to a bi-objective optimal control problem. Since the system is semilinear, the functionals are not convex in general. To overcome this difficulty, we first prove the existence and uniqueness of the Nash quasi-equilibrium, which is a weaker formulation of the Nash equilibrium. Next, with additional conditi…
Controllability of time-varying lumped semilinear systems
本研究针对由半线性微分方程描述的时变集总控制系统，在其 underlying 线性系统可控且非线性强迫函数满足适配有界性条件时，证明该半线性系统近似可控。
Controllability problems of a neutral integro-differential equation with memory
本研究针对带记忆的半线性中性积分微分方程，在Banach空间中探讨了温和解的存在性及线性和半线性系统的近似可控性，通过引入预解族和构造线性二次调节器问题等方法，为偏微分方程的可控性提供了理论依据。
In many practical applications of control theory some constraints on the state and/or on the control need to be imposed. In this paper, we prove controllability results for semilinear parabolic equations under positivity constraints on the control, when the time horizon is long enough. As we shall see, in fact, the minimal controllability time turns out to be strictly positive. More precisely, we prove a global steady state constrained controllability result for a semilinear parabolic equation with $C^1$ nonlinearity, without sign or globally Lipschitz assumptions on the nonlinear term. Then, …
Boundary Controllability of Riemann-Liouville Fractional Semilinear Equations
本文研究带Neumann边界条件的Riemann-Liouville分数阶半线性次扩散系统的边界区域可控性，利用半群理论、分数阶Hilbert唯一性方法和Schauder不动点定理给出充分条件，并通过数值模拟验证了方法的有效性。
We study the internal controllability of the semilinear wave equation $$v_{tt}(x,t)-Δv(x,t) + f(x,v(x,t))= \Un_ω u(x,t)$$ for some nonlinearities $f$ which can produce several non-trivial steady states. One of the usual hypotheses to get global controllability, is to assume that $f(x,v)v\geq 0$. In this case, a stabilisation term $u=γ(x)v_t$ makes any solution converging to zero. The global controllability then follows from a theorem of local controllability and the time reversibility of the equation. In this paper, the nonlinearity $f$ can be more general, so that the solutions of the damped …
It is well-known that the controllability of finite-dimensional nonlinear systems can be established by showing the controllability of the linearized system. However, this classical result does not generalize to infinite-dimensional nonlinear systems. In this paper, we restrict ourselves to semilinear infinite-dimensional systems, and show that the exact controllability of the linearized system implies exact controllability of the nonlinear system. The restrictions concerning the nonlinear operator are similar to those that can be found in the literature about the linearized stability analysis…
Local controllability around a regular solution and null-controllability of scattering solutions for semilinear wave equations
本文研究半线性波动与 Klein-Gordon 方程，在几何控制条件下证明部分解析解及部分爆破解附近的局部能控性，并利用局部能量衰减和全局 Strichartz 估计建立小维数非捕获外域散射解的零能控性。
Controllability problem of an evolution equation with singular memory
本文研究带奇异记忆核的半线性演化方程的可控性，引入预解族，通过线性二次调节器及充分条件，证明了线性和半线性系统的近似可控性，并应用于热方程。
We study the global approximate controllability properties of a one dimensional semilinear reaction-diffusion equation governed via the coefficient of the reaction term. It is assumed that both the initial and target states admit no more than finitely many changes of sign. Our goal is to show that any target state $ u^*\in H_0^1 (0,1)$, with as many changes of sign in the same order as the given initial data $ u_0\in H^1_0(0,1)$, can be approximately reached in the $ L^2 (0,1)$-norm at some time $T>0$. Our method employs shifting the points of sign change by making use of a finite sequence of …
The main objective of this paper is to establish the null controllability for the fourth order semilinear parabolic equations with the nonlinearities involving the state and its gradient up to second order. First of all, based on optimal control theory of partial differential equations and global Carleman estimates obtained in \cite{gs} for fourth order parabolic equation with $L^2(Q)$-external force, we establish the global Carleman estimates for the $L^2(Q)$ weak solutions of the same system with a low regularity external term and some linear terms including the derivatives of the state up t…
Control of semilinear differential equations with moving singularities
针对带移动奇点的半线性微分方程的控制问题，提出依赖奇点（进而依赖控制变量）的可控性条件，给出控制泛函全域连续的充分条件，用上下解结合二分法证明可控性并近似控制，附算例与仿真，结果可推广到分数阶微分方程。
The semilinear beam equation with impulses, memory and delay is considered. We obtain the approximate controllability. This is done by employing a technique that avoids fixed point theorems and pulling back the control solution to a fixed curve in a short time interval. Demonstrating, once again, that the controllability of a system is robust under the influence of impulses and delays.
On the exact boundary controllability of semilinear wave equations
本文针对有界区域上的半线性波动方程，在非线性项满足对数型增长条件下，分别用 Schauder 与 Banach 不动点定理证明一致能控性并构造收敛的状态–控制对。
We consider the semilinear heat equation posed on a smooth bounded domain $Ω$ of $\mathbb{R}^{N}$ with Dirichlet or Neumann boundary conditions. The control input is a source term localized in some arbitrary nonempty open subset $ω$ of $Ω$. The goal of this paper is to prove the uniform large time global null-controllability for semilinearities $f(s) = \pm |s| \log^α(2+|s|)$ where $α\in [3/2,2)$ which is the case left open by Enrique Fernandez-Cara and Enrique Zuazua in 2000. It is worth mentioning that the free solution (without control) can blow-up. First, we establish the small-time global …
Optimal Control and Approximate controllability of fractional semilinear differential inclusion involving $ψ$- Hilfer fractional derivatives
本文研究含 $ψ$-Hilfer 分数阶导数的半线性微分包含，利用紧半群、线性系统近似能控性及对偶映射构造控制，克服自反 Banach 空间中的凸性难题，并给出最优控制与示例验证。
In this paper, we first prove a uniform upper bound on costs of null controls for semilinear heat equations with globally Lipschitz nonlinearity on a sequence of increasing domains, where the controls are acted on an equidistributed set that spreads out in the whole Euclidean space R^N . As an application, we then show the exactly null controllability for this semilinear heat equation in R^N . The main novelty here is that the upper bound on costs of null controls for such kind of equations in large but bounded domains can be made uniformly with respect to the sizes of domains under considerat…
The semilinear heat equation with non-instantaneous impulses \textbf{(NII)}, memory, and delay is considered and its approximate controllability is obtained. This is done by employing a technique that avoids fixed point theorems and pulls back the control solution to a fixed curve in a short time interval. We demonstrate, once again, that the controllability of the system is robust under the influence of non-instantaneous impulses, memory, and delays. Finally, we present some open problems and a possible general framework to study the controllability of non-instantaneous impulses semilinear sy…
The present work is devoted to the problem of boundary stabilization of the semilinear 1-D heat equation with nonlocal boundary conditions. The stabilizing controller is finite-dimensional, linear, given in an explicit form, involving only the eigenfunctions of the Laplace operator with nonlocal boundary conditions.
In this paper, we establish the equivalence of minimal time and minimal norm control problems for semilinear heat equations in which the controls are distributed internally in an open subset of the state domain. As an application, the Bang-Bang property for minimal norm controls are also presented.
In this paper, we derive a bang-bang property of a kind of time optimal control problem for some semilinear heat equation on bounded $C^2$ domains (of the Euclidean space), with homogeneous Dirichlet boundary condition and controls distributed on an open and non-empty subset of the domain where the equation evolves.
Remarks on finite-approximate controllability of impulsive evolution systems via resolvent-like operator in Hilbert spaces
该研究针对希尔伯特空间中的脉冲演化系统，借助类预解算子与绍德尔不动点定理，分别证明线性及半线性脉冲系统的有限近似可控性，并将结果推广至热方程应用。
Controllability of nonautonomous measure driven integrodifferential evolution equations with nonlocal conditions
本文研究非局部环境下半线性测度驱动积分微分系统的精确可控性，利用非紧性测度和蒙奇不动点定理提供充分可控性条件，扩展并改进了以往研究成果。
In this paper, we consider a non-autonomous nonlinear evolution equation in separable, reflexive Banach spaces. First, we consider a linear problem and establish the approximate controllability results by finding a feedback control with the help of an optimal control problem. We then establish the approximate controllability results for a semilinear differential equation in Banach spaces using the theory of linear evolution systems, properties of resolvent operator and Schauder's fixed point theorem. Finally, we provide an example of a non-autonomous, nonlinear diffusion equation in Banach spa…
Hierarchical control for the semilinear parabolic equations with interior degeneracy
本文利用Stackelberg-Nash策略研究具有内部退化性的半线性抛物型方程的分层控制，证明Nash均衡的存在唯一性并建立新的Carleman估计以解决领导者的零能控性问题。
We prove null controllability for linear and semilinear heat equations with dynamic boundary conditions of surface diffusion type. The results are based on a new Carleman estimate for this type of boundary conditions.
This paper is addressed to a study of the null controllability for the semilinear parabolic equation with a complex principal part. For this purpose, we establish a key weighted identity for partial differential operators $(\a+i\b)\pa_t+\sum\limits_{j,k=1}^n\pa_k(a^{jk}\pa_j)$ (with real functions $\a$ and $\b$), by which we develop a universal approach, based on global Carleman estimate, to deduce not only the desired explicit observability estimate for the linearized complex Ginzburg-Landau equation, but also all the known controllability/observability results for the parabolic, hyperbolic, …
In this paper we present a null controllability result for a degenerate semilinear parabolic equation with first order terms. The main result is obtained after the proof of a new Carleman inequality for a degenerate linear parabolic equation with first order terms.
Boundary controllability of incompressible Euler fluids with Boussinesq heat effects
本文研究热效应重要的无粘不可压缩流体的边界可控性，通过Boussinesq近似建模，在零热扩散情形下建立了二维和三维流动中速度场和温度的同步全局精确可控性，并在正热扩散系数下给出了速度场精确可控性和温度局部零可控性的附加结果。
We prove the internal controllability of some systems of two coupled wave equations in one space dimension, with one control, under certain conditions on the coupling. To do this we apply the "fictitious control method" in two cases: general systems with a "non-degenerate" coupling, and a particular case where the coupling is "degenerate", namely a cubic coupling. In the latter case, our proof requires to find nontrivial trajectories of the control system that go from $0$ to $0$. We build these trajectories by adapting (in $1$ space dimension) a construction developed by Jean-Michel Coron, Ser…
Controllability of wave-heat and heat-wave cascades
本文研究了波-热和热-波级联的可控性问题，通过双曲-抛物级联模型，提出了精确可控时间的下界和加权Hilbert空间中的谱特征，并探讨了耦合方向反转对正则性损失的影响。
This paper studies the approximate and null controllability for impulse controlled systems of heat equations coupled by a pair (A,B) of constant matrices. We present a necessary and sufficient condition for the approximate controllability, which is exactly Kalman's controllability rank condition of (A,B). We prove that when such a system is approximately controllable, the approximate controllability over an interval [0,T] can be realized by adding controls at arbitrary n different control instants 0<τ_1<τ_2<\cdots<τ_n<T, provided that τ_n-τ_1<d_A, where d_A=\min\{π/|Im λ| : λ\in σ(A)\}. We als…
Delay and Memory-Type Null Controllability for Heat Equations in Finite Dimensions
本文研究了有限维热方程中包含记忆和时间延迟的null可控性，提出了一种新的可控性概念，并推导了扩展的卡尔曼准则。
We derive in a direct and rather straightforward way the null controllability of a 2-D heat equation with boundary control. We use the so-called flatness approach, which consists in parameterizing the solution and the control by the derivatives of a "flat output". This provides an explicit control law achieving the exact steering to zero. Numerical experiments demonstrate the relevance of the approach.
The exact distributed controllability of the semilinear heat equation $\partial_{t}y-Δy + g(y)=f \,1_ω$ posed over multi-dimensional and bounded domains, assuming that $g\in C^1(\mathbb{R})$ satisfies the growth condition $\limsup_{r\to \infty} g(r)/(\vert r\vert \ln^{3/2}\vert r\vert)=0$ has been obtained by Fernández-Cara and Zuazua in 2000. The proof based on a non constructive fixed point arguments makes use of precise estimates of the observability constant for a linearized heat equation. In the one dimensional setting, assuming that $g^\prime$ does not grow faster than $β\ln^{3/2}\vert r…
In this paper, we present some controllability results for the heat equation in the framework of hierarchic control. We present a Stackelberg strategy combining the concept of controllability with robustness: the main control (the leader) is in charge of a null-controllability objective while a secondary control (the follower) solves a robust control problem, this is, we look for an optimal control in the presence of the worst disturbance. We improve previous results by considering that either the leader or follower control acts on a small part of the boundary. We also present a discussion abo…
New global Carleman estimates and null controllability for a stochastic Cahn-Hilliard type equation
本文针对半线性项含一、二阶导数的随机 Cahn-Hilliard 型方程，通过建立新的全局 Carleman 估计并结合不动点方法，证明了其零能控性。
Optimal Control of 1D Semilinear Heat Equations with Moment-SOS Relaxations
针对带非线性项的一维热方程最优控制问题，扩展基于矩的偏微分方程控制框架至二次控制成本，提出从解近似矩提取边界非线性控制器的方法，经数值验证且优于线性二次控制器。
We study global finite-dimensional observer-based stabilization of a semilinear 1D heat equation with globally Lipschitz semilinearity in the state variable. We consider Neumann actuation and point measurement. Using dynamic extension and modal decomposition we derive nonlinear ODEs for the modes of the state. We propose a controller that is based on a nonlinear finite-dimensional Luenberger observer. Our Lypunov $H^1$-stability analysis leads to LMIs, which are shown to be feasible for a large enough observer dimension and small enough Lipschitz constant. Next, we consider the case of a const…
In this paper we establish hierarchic control for the linear heat equation in $\re^N$ with potentials. Our strategy is inspired by the techniques developed by J.I. Díaz and J.-L. Lions \cite{DL}; however many new difficulties arise due to lack of compactness of Sobolev embeddings. We manage these adversities by employing similarity variables and weighted Sobolev spaces.
Tracking controllability for the heat equation
本文研究热方程的跟踪可控性，通过边界控制使法向通量跟踪给定轨迹，提出变换方法并给出近似控制成本估计。
Internal null controllability for the one-dimensional heat equation with dynamic boundary conditions
本文通过新的Carleman估计和可观测性不等式，证明了一维动态边界热方程的内部零能控性，并用数值实验验证了最小L2范数控制的有效性。
We consider a linear hybrid system composed by two rods of equal length connected by a point mass. We show that the system is null controllable with Dirichlet and Neumann controls. The results are based on a careful spectral spectral analysis together with the moment method.
The exact distributed controllability of the semilinear wave equation $\partial_{tt}y-Δy + g(y)=f \,1_ω$ posed over multi-dimensional and bounded domains, assuming that $g\in C^1(\mathbb{R})$ satisfies the growth condition $\limsup_{r\to \infty} g(r)/(\vert r\vert \ln^{1/2}\vert r\vert)=0$ has been obtained by Fu, Yong and Zhang in 2007. The proof based on a non constructive Leray-Schauder fixed point theorem makes use of precise estimates of the observability constant for a linearized wave equation. Assuming that $g^\prime$ does not grow faster than $β\ln^{1/2}\vert r\vert$ at infinity for $β…
In this paper, we prove a Carleman estimate for fully-discrete approximations of parabolic operators in which the discrete parameters $h$ and $\triangle t$ are connected to the large Carleman parameter. We use this estimate to obtain relaxed observability inequalities which yield, by duality, controllability results for fully-discrete linear and semilinear parabolic equations.
Blow-up for weakly superlinear heat equations and blow-up controllability of the linear heat equation
本文重新审视弱超线性热方程的爆破理论，并探索线性热方程的内部全局/区域爆破可控性概念。
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