24 research outputs found
On the structural representation of S-homogenized optimal control problems
The aim of this paper is an application of variational S-convergence [1-3] to homogenization theory of optimal control problems and to explore the structure of homogenized problems. We have proved the existence of strongly S-homogenized optimal control problems for a family of nonlinear systems with distributed parameters, have derived some important properties which will be use in future and give the formula for representation of homogenized problems
Квазі-напівнеперервна знизу регуляризація відображень у банахових просторах
The method of the quasi-lower semicontinuous regularization of mappings in Banach spaces is proposed.Запропоновано спосіб квазі-напівнеперервної знизу регуляризації відображень у банахових просторах
До питання регулярізації задач векторної оптимізації
We propose the method of regularization of one class of vector optimizations problems in Banach spaces, in case where vector-valued mapping is not lower semicontinuous in certain sense, which implies violation of sufficient conditions of solvability.Запропоновано спосіб регулярізації одного класу задач нескалярної оптимізації в банахових просторах, для випадку, коли векторнозначне відображення не є напівнеперервним знизу у певному сенсі, внаслідок чого порушуються достатні умови розв'язності
Relaxation Methods for Mixed-Integer Optimal Control of Partial Differential Equations
We consider integer-restricted optimal control of systems governed by
abstract semilinear evolution equations. This includes the problem of optimal
control design for certain distributed parameter systems endowed with multiple
actuators, where the task is to minimize costs associated with the dynamics of
the system by choosing, for each instant in time, one of the actuators together
with ordinary controls. We consider relaxation techniques that are already used
successfully for mixed-integer optimal control of ordinary differential
equations. Our analysis yields sufficient conditions such that the optimal
value and the optimal state of the relaxed problem can be approximated with
arbitrary precision by a control satisfying the integer restrictions. The
results are obtained by semigroup theory methods. The approach is constructive
and gives rise to a numerical method. We supplement the analysis with numerical
experiments
Regularization-independent study of renormalized non-perturbative quenched QED
A recently proposed regularization-independent method is used for the first
time to solve the renormalized fermion Schwinger-Dyson equation numerically in
quenched QED. The Curtis-Pennington vertex is used to illustrate the
technique and to facilitate comparison with previous calculations which used
the alternative regularization schemes of modified ultraviolet cut-off and
dimensional regularization. Our new results are in excellent numerical
agreement with these, and so we can now conclude with confidence that there is
no residual regularization dependence in these results. Moreover, from a
computational point of view the regularization independent method has enormous
advantages, since all integrals are absolutely convergent by construction, and
so do not mix small and arbitrarily large momentum scales. We analytically
predict power law behaviour in the asymptotic region, which is confirmed
numerically with high precision. The successful demonstration of this efficient
new technique opens the way for studies of unquenched QED to be undertaken in
the near future.Comment: 20 pages,5 figure
On approximation of an optimal boundary control problem for linear elliptic equation with unbounded coefficients
We study an optimal boundary control problem (OCP) associated to a linear elliptic equation -div (‚àáy + A(x)‚àáy) = f. The characteristic feature of this equation is the fact that the matrix A(x) = [aij (x)] i;j=1
On the homogenezation of control system with non-regular constraints
This paper is devoted to the homogenization problem of a control objects all components of mathematical description of which may depend on some small parameter ε. It is assumed that the control object is discribed by a linear elliptic equation subject to control constraints
Замітка про H-збіжність
In this paper we study the H-convergence property for the uniformly bounded sequences of square matrices $\left\{ A_{\varepsilon} \in L^{\infty} (D; \mathbb{R}^{n \times n}) \right\}_{\varepsilon > 0}$ таких послідовностей
Про $L^1$-матриці з виродженим спектром та слабку збіжність у зв'язаних вагових просторах Соболєва
We study the compactness property of the weak convergence in variable Sobolev spaces of the following sequences $\left\{ (A_n,u_n) \in L^1(\Omega; {\mathbb{R}}^{N\times N}) \times W_{A_n}(\Omega; {\Gamma}_D) \right\}$, а їх власнi числа можуть дорiвнювати нулю на пiдмножинах мiри нуль
Про деякі гладкі наближення на густих періодичних сингулярних з'єднаннях
In this paper we study the approximation properties of measurable and square-integrable functions. In particular we show that any $L^2$ гладкою функцією, за її значеннями на боковій поверхні швидко осцилюючого сингулярного з'єднання. Отримано оцінки таких наближень та досліджено їх асимптотичну поведінку