Results 41 to 50 of about 2,636 (156)
The Existence of Moving Spike Patterns in an Attractive Chemotaxis Model
Mathematical Methods in the Applied Sciences, Volume 48, Issue 14, Page 13505-13516, 30 September 2025.ABSTRACT We prove rigorously the existence of moving spike patterns in an attractive chemotaxis model with small diffusion coefficient for the chemical. In the zero diffusion limit, ϵ→0$$ \epsilon \to 0 $$, we prove that the non‐monotone traveling wave solutions of the system with ϵ>0$$ \epsilon >0 $$ converge to those of the system with ϵ=0$$ \epsilon
Tong Li, Casey Stone
wiley +1 more source
Gaussian Transforms Modeling and the Estimation of Distributional Regression Functions
Econometrica, Volume 93, Issue 5, Page 1885-1913, September 2025.We propose flexible Gaussian representations for conditional cumulative distribution functions and give a concave likelihood criterion for their estimation. Optimal representations satisfy the monotonicity property of conditional cumulative distribution functions, including in finite samples and under general misspecification.
Richard H. Spady, Sami Stouli
wiley +1 more source
Robust causal inference for point exposures with missing confounders
Canadian Journal of Statistics, Volume 53, Issue 2, June 2025.Abstract Large observational databases are often subject to missing data. As such, methods for causal inference must simultaneously handle confounding and missingness; surprisingly little work has been done at this intersection. Motivated by this, we propose an efficient and robust estimator of the causal average treatment effect from cohort studies ...
Alexander W. Levis +3 more
wiley +1 more source
Electronic Journal of Differential Equations, 2014 In this article, we study the asymptotic dynamics in nonmonotone comparable almost periodic reaction-diffusion systems with Dirichlet boundary condition, which are comparable with uniformly stable strongly order-preserving system.
Feng Cao, Yelai Fu
doaj
An optimal subgradient algorithm for large-scale convex optimization in simple domains [PDF]
, 2015 This paper shows that the optimal subgradient algorithm, OSGA, proposed in \cite{NeuO} can be used for solving structured large-scale convex constrained optimization problems.
Ahookhosh, Masoud, Neumaier, Arnold
core +1 more source
Decomposition of Distributed Nonmonotonic Multi-Context Systems [PDF]
, 2010 Multi-Context Systems (MCS) are formalisms that enable the inter-linkage of single knowledge bases, called contexts, via bridge rules. Recently, a fully distributed algorithm for evaluating heterogeneous, nonmonotonic MCS was described in [7]. In this paper, we continue this line of work and present a decomposition technique for MCS which analyzes the ...
Seif El-Din Bairakdar +4 more
openaire +1 more source
Theory‐Driven IRT Modeling of Vocabulary Development: Matthew Effects and the Case for Unipolar IRT
Journal of Educational Measurement, Volume 62, Issue 2, Page 199-224, Summer 2025.Abstract Item response theory (IRT) encompasses a broader class of measurement models than is commonly appreciated by practitioners in educational measurement. For measures of vocabulary and its development, we show how psychological theory might in certain instances support unipolar IRT modeling as a superior alternative to the more traditional ...
Qi (Helen) Huang +2 more
wiley +1 more source
A Nonmonotone Projection Method for Constrained System of Nonlinear Equations [PDF]
Mathematical Problems in Engineering, 2017 This paper deals with the nonmonotone projection algorithm for constrained nonlinear equations. For some starting points, the previous projection algorithms for the problem may encounter slow convergence which is related to the monotone behavior of the iterative sequence as well as the iterative direction.
Yazheng Dang, Wenwen Liu
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Mathematical Methods in the Applied Sciences, Volume 48, Issue 8, Page 9088-9097, 30 May 2025.ABSTRACT We suggest a modified version of the nonnegative matrix factorization problem, adding penalty terms to the model with the aim of taking control of the condition number of the decomposition elements. This measure is taken to reinforce computational stability in the solution path of the relevant optimization model.
Fatemeh Dargahi +3 more
wiley +1 more source
Sequential Convex Programming Methods for A Class of Structured Nonlinear Programming [PDF]
, 2016 In this paper we study a broad class of structured nonlinear programming (SNLP) problems. In particular, we first establish the first-order optimality conditions for them.
Lu, Zhaosong
core