Results 101 to 110 of about 334,176 (302)

Discordance Between Systemic Lupus Erythematosus Disease Activity Index Domain Weights and Their Association With Organ Damage Accrual

Arthritis Care &Research, EarlyView.
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

A study of convergence for a fourth-order two-point iteration in Banach spaces. [PDF]

, 1999
The authors consider the method (1)x2n+1:=x2n−f′(x2n)−1f(x2n),x2n+2:=x2n+1−34H(I−32H)(x2n+1−x2n),H:=H(x2n,x2n+1):=f′(x2n)−1[f′(x2n+23(x2n+1−x2n))−f′(x2n)],for solving operator equations f(x)=0 in Banach spaces.
Ezquerro, J.A. [0000-0001-8120-167X], Hernandez, M.A. [0000-0001-5478-2958]   +1 more
core  

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

NOMINAL CONVERGENCE: THE CASE OF ROMANIA [PDF]

The main objectives of this paper are: determining the extent to which the indicators of nominal convergence reflect the reality of the Romanian economy, in order to find an optimal correlation between nominal and real convergence from the point of view ...
Silvia Mărginean, Ramona Orăştean
core  

Efficient Fourth-Order Weights in Kernel-Type Methods without Increasing the Stencil Size with an Application in a Time-Dependent Fractional PDE Problem

Mathematics
An effective strategy to enhance the convergence order of nodal approximations in interpolation or PDE problems is to increase the size of the stencil, albeit at the cost of increased computational burden.
Tao Liu, Stanford Shateyi
doaj   +1 more source

Filter Functions with Exponential Convergence Order [PDF]

Mathematische Nachrichten, 1994
AbstractOversampled functions can be evaluated using generalized sinc‐series and filter functions connected with these series. A standard filter function is given by exp ((ζ2 − 1)−1). We show that the Fourier transform of this filter posseses the convergence order 0(exp (−√x)), improving an estimation given in [10].
openaire   +3 more sources

Adaptive Observer for Coupled Wave PDE and Infinite ODE With Sampled Data and Unknown Input: Application to Brain Hemodynamics Estimation

International Journal of Adaptive Control and Signal Processing, EarlyView.
This article proposes a convergent adaptive observer for a damped wave PDE and an infinite‐dimensional ODE coupled in cascade using sampled‐in‐space ODE state measurements. The proposed observer estimates the distributed states of the PDE and ODE along with unknown PDE parameters and spatial input.
Zehor Belkhatir, Sarah Mechhoud, Taous‐Meriem Laleg‐Kirati   +2 more
wiley   +1 more source

Solving System of Nonlinear Equations by using a New Three-Step Method [PDF]

Control and Optimization in Applied Mathematics, 2016
In this paper, we suggest a fifth order convergence three-step method for solving system of nonlinear equations. Each iteration of the method requires two function evaluations, two first Fr\'{e}chet derivative evaluations and two matrix inversions. Hence,
Mehdi Ahmadi, Hamid Esmaeili, R Erfanifar   +2 more
doaj  

(A, ?, ?)-invariant statistical convergence of order ?

, 2019
The aim of this paper is to introduce and present some properties of (A, ?, ?)-invariant statistically convergent which is defined using the ?-function and the generalized three parametric real matrix. Further some inclusion theorems are proved. © 2019 Author(s).
openaire   +2 more sources

Observer‐Based Adaptive Event‐Triggered Tracking Control for Fuzzy TS Systems With Premise Mismatch

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper presents an adaptive logistic event‐triggered observer‐based tracking controller for Takagi‐Sugeno fuzzy systems under constrained inputs and network delays. Leveraging a hybrid LMI and Secretary Bird Optimization approach, this strategy significantly minimizes communication overhead and computational burden while ensuring optimal reference ...
Oussama Djadane, Salama Makni, Mourad Kchaou, Ahmed El Hajjaji   +3 more
wiley   +1 more source