Results 101 to 110 of about 493,106 (301)

Asymptotic approximation to a solution of a singularly perturbed linear-quadratic optimal control problem with second-order linear ordinary differential equation of state variable

Numerical Algebra, Control & Optimization, 2021
<p style='text-indent:20px;'>The direct scheme method is applied to construct an asymptotic approximation of any order to a solution of a singularly perturbed optimal problem with scalar state, controlled via a second-order linear ODE and two fixed end points. The error estimates for state and control variables and for the functional are obtained.
openaire   +2 more sources

Discordance Between Patient and Physician Global Assessments in Early Systemic Sclerosis

Arthritis Care &Research, EarlyView.
Objective This study aims to identify factors associated with patient global assessment (PtGA) and physician global assessment (PhGA) and discordance between them in systemic sclerosis (SSc). Methods Data from adults with early SSc (<5 years) from the Collaborative National Quality and Efficacy Registry were included.
Ellen Romich, Alexis Ogdie, Alisa Stephens Shields, Peter A. Merkel, Shervin Assassi, Elana J. Bernstein, Andreea Bujor, Flavia V. Castelino, Lorinda Chung, Luke B. Evnin, Tracy M. Frech, Jessica K. Gordon, Melissa Griffith, Faye N. Hant, Monica L. Harding, Laura K. Hummers, Dinesh Khanna, Kimberly S. Lakin, Dorota J. Lebiedz‐Odrobina, Yiming Luo, Ashima Makol, Maureen D. Mayes, Zsuzsanna H. McMahan, Jerry Molitor, Duncan F. Moore, Julie Paik, Carrie Richardson, Brian Skaug, Ami A. Shah, Ankoor Shah, Virginia Steen, John M. VanBuren, Elizabeth R. Volkmann, Carleigh Zahn, Nora Sandorfi, for the CONQUER Investigators   +35 more
wiley   +1 more source

Drag flow analysis of Oldroyd eight constant fluid

Alexandria Engineering Journal, 2016
This article presents the steady drag flow problems. The incompressible Oldroyd eight constant fluid flow is considered between two infinite parallel plates.
A.M. Siddiqui, A. Sohail, A. Ashraf, Q.A. Azim   +3 more
doaj   +1 more source

Bayesian analysis of DSGE models [PDF]

This paper reviews Bayesian methods that have been developed in recent years to estimate and evaluate dynamic stochastic general equilibrium (DSGE) models.
Frank Schorfheide, Sungbae An
core  

Discordance between systemic lupus erythematosus disease activity index domain weights and their association with organ damage accrual

Arthritis Care &Research, Accepted Article.
Objective Studies of damage accrual in patients with systemic lupus erythematosus (SLE) show associations with disease activity measured by the SLE Disease Activity Index 2000 (SLEDAI‐2K), but these associations are imperfect. SLEDAI scores are powerfully influenced by weightings (1‐8) assigned to each domain.
Kevin Zhang, Eric F. Morand, Sarah E. Boyd, François Petitjean, Alberta Hoi, Rachel Koelmeyer, Iolanda Miceli, Julie A. Monk, Hieu T. Nim   +8 more
wiley   +1 more source

Numerical study of self-adjoint singularly perturbed two-point boundary value problems using collocation method with error estimation

Journal of Ocean Engineering and Science, 2018
A numerical treatment for self-adjoint singularly perturbed second-order two-point boundary value problems using trigonometric quintic B-splines is presented, which depend on different engineering applications.
Khalid K. Ali, A.R. Hadhoud, M.A. Shaalan   +2 more
doaj   +1 more source

de Sitter spacetime: effects of metric perturbations on geodesic motion

, 2011
Gravitational perturbations of the de Sitter spacetime are investigated using the Regge--Wheeler formalism. The set of perturbation equations is reduced to a single second order differential equation of the Heun-type for both electric and magnetic ...
A. Higuchi, A. Higuchi, A. Ronveaux, A. Vilenkin, A.A. Starobinsky, A.A. Starobinsky, A.H. Guth, Andrea Geralico, B. Allen, D. Lohiya, D. Lohiya, D.N. Spergel, D.V. Gal’tsov, Donato Bini, E.T. Newman, G.W. Gibbons, Giampiero Esposito, H. Suzuki, J. Guven, J. Jackson, J.J. Kovacic, K. Heun, S. Biswas, S. Chandrasekhar, S. Teukolsky, S.D. Bass, S.W. Hawking, T. Regge, U. Khanal, V. Ferrari, V.F. Mukhanov   +30 more
core   +1 more source

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +1 more source

A posteriori error bounds for the approximate solution of second-order ODEs by piecewise coefficients perturbation methods

Journal of Computational and Applied Mathematics, 2006
The paper deals with ordinary differential equations (ODEs) of second order solved by a piecewise coefficients perturbation method. The author presents a constructive approach for the computation of upper and lower bounds for the error. Adequate numerical simulations are presented.
openaire   +2 more sources

New spectral element method for the singular perturbation problem of second order

上海师范大学学报. 自然科学版
As the solution of singular perturbation problem of second order has a boundary layer, it is difficult to obtain ideal approximation results for traditional numerical methods.
LIU Zhipeng, TAO Dongya
doaj   +1 more source