Results 51 to 60 of about 2,689,299 (123)

Regularization of linear ill-posed problems involving multiplication operators [PDF]

arXiv, 2019
We study regularization of ill-posed equations involving multiplication operators when the multiplier function is positive almost everywhere and zero is an accumulation point of the range of this function. Such equations naturally arise from equations based on non-compact self-adjoint operators in Hilbert space, after applying unitary transformations ...
arxiv  

Methods of Solving Ill-Posed Problems [PDF]

arXiv, 2012
Many physical problems can be formulated as operator equations of the form Au = f. If these operator equations are ill-posed, we then resort to finding the approximate solutions numerically. Ill-posed problems can be found in the fields of mathematical analysis, mathematical physics, geophysics, medicine, tomography, technology and ecology.
arxiv  

Severity of illness and the teaching hospital

Academic Medicine, 1986
In the current environment of cost containment pressures on health care providers, teaching hospitals are facing increased financial risks that could jeopardize their special role in the health care delivery system. One of these risks is that the Medicare prospective payment system does not adequately account for severity of illness.
D Kwo, L Botnick, J Green, Berman Ra, K F Safian   +4 more
openaire   +4 more sources

Cognitive flexibility and DSM-5 severity criteria for eating disorders: assessing drive for thinness and duration of illness as alternative severity variables

Journal of Eating Disorders, 2023
Background The severity criteria for eating disorders (EDs) proposed in the DSM-5 have been established without sufficient empirical support. Drive for thinness (DT) and duration of illness have been proposed as two alternative severity measures, however
Bernat Mora-Maltas, Ignacio Lucas, Roser Granero, Cristina Vintró-Alcaraz, Romina Miranda-Olivos, Isabel Baenas, Isabel Sánchez, Jessica Jiménez-del Toro, Jéssica Sánchez-González, Isabel Krug, Javier Tapia, Susana Jiménez-Murcia, Fernando Fernández-Aranda   +12 more
doaj   +1 more source

Some Results on the Regularization of LSQR for Large-Scale Discrete Ill-Posed Problems [PDF]

Science China Mathematics, 60 (4) (2017): 701-718, 2015
LSQR, a Lanczos bidiagonalization based Krylov subspace iterative method, and its mathematically equivalent CGLS applied to normal equations system, are commonly used for large-scale discrete ill-posed problems. It is well known that LSQR and CGLS have regularizing effects, where the number of iterations plays the role of the regularization parameter ...
arxiv  

Generalizing the SVD of a matrix under non-standard inner product and its applications to linear ill-posed problems [PDF]

arXiv, 2023
The singular value decomposition (SVD) of a matrix is a powerful tool for many matrix computation problems. In this paper, we consider generalizing the standard SVD to analyze and compute the regularized solution of linear ill-posed problems that arise from discretizing the first kind Fredholm integral equations. For the commonly used quadrature method
arxiv  

The Association Between Quality of Nursing Care in the ICU and Severity of Illness

Journal of Client-centered Nursing Care, 2022
Background: The quality of nursing care can be affected by various factors. This study aims to determine the correlation between the quality of nursing care and the Severity of Illness (SOI) in patients admitted to the Intensive Care Units (ICUs ...
Narges Mohammadi, Mohammad Abdi, Mohammadreza Dinmohammadi   +2 more
doaj  

On rate optimality for ill-posed inverse problems in econometrics [PDF]

arXiv, 2007
In this paper, we clarify the relations between the existing sets of regularity conditions for convergence rates of nonparametric indirect regression (NPIR) and nonparametric instrumental variables (NPIV) regression models. We establish minimax risk lower bounds in mean integrated squared error loss for the NPIR and the NPIV models under two basic ...
arxiv  

25-Hydroxy Vitamin D Deficiency Is Associated With Cardiovascular Sequential Organ Failure Assessment and Pediatric Risk of Mortality III Scores in Critically Ill Children

Frontiers in Pediatrics, 2020
Aim: Investigate 25-hydroxy vitamin D (25(OH)D) levels and the correlation with cardiovascular sequential organ failure assessment (CV-SOFA) and pediatric risk of mortality III (PRISM-III) scores in critically ill children.Methods: This prospective ...
Hongxing Dang, Hongxing Dang, Hongxing Dang, Jing Li, Jing Li, Jing Li, Chengjun Liu, Chengjun Liu, Chengjun Liu, Feng Xu, Feng Xu, Feng Xu   +11 more
doaj   +1 more source

Cytokine levels in critically ill children with Severe Sepsis and their correlation with the severity of illness and mortality

Journal of Pediatric Critical Care, 2018
Objective: To study the baseline cytokine levels and their relation with the severity of illness and mortality in critically ill children with severe sepsis. Design: Subgroup analysis of a randomized, double-blind, placebo-controlled trial. Setting: Pediatric intensive care unit of a tertiary level teaching hospital in India.
Ritu Aggarwal, Sunit Singhi, Sunit Singhi, Jayashree Muralidharan, Arun Bansal, Suresh Kumar Angurana   +5 more
openaire   +4 more sources