Results 31 to 40 of about 17,148,641 (166)
How to get a conservative well-posed linear system out of thin air. Part I. Well-posedness and energy balance [PDF]
, 2003 Published ...
Tucsnak, Marius +5 more
core +1 more source
Transcritical bifurcation in a new fractional influenza-type model with dual general incidences
Scientific AfricanWe study a fractional influenza-type epidemic model with Caputo derivative of order ϑ∈(0,1], dual incidence kernels acting on susceptible and vaccinated individuals, vaccination with imperfect protection, waning immunity, isolation, and symptomatic ...
Yassine Sabbar, Kottakkaran Sooppy Nisar
doaj +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.An energy‐conserving discrete framework for the vertical discretisation of stratified ocean models is developed using internal gravity‐wave theory. A β$$ \beta $$‐indexed family of schemes is analysed through perturbation theory, revealing optimal parameter choices and grid designs that reduce truncation errors significantly.
Gabriel Derrida +3 more
wiley +1 more source
A stage structured predator–prey system with time delays and fear effect
Electronic Journal of Qualitative Theory of Differential EquationsIn this study, we develop a delayed predator–prey model that incorporates two stage structures for both predator and prey populations, along with two constant maturation delays and fear effect.
Lingrui Li, Junli Liu, Tailei Zhang
doaj +1 more source
International Journal of Robust and Nonlinear Control, EarlyView.ABSTRACT The safety verification of neural network (NN) controllers operating in uncertain environments characterized by unmodeled dynamics, nonlinearities, and time delays remains a fundamental challenge in robust control analysis. This article introduces a novel method, termed Keep‐Close, for analyzing the performance and robustness of uncertain ...
Abdelhafid Zenati, Nabil Aouf
wiley +1 more source
Hyperbolic systems with non-diagonalisable principal part and variable multiplicities, I: well-posedness [PDF]
, 2018 In this paper we analyse the well-posedness of the Cauchy problem for a rather general class of hyperbolic systems with space-time dependent coefficients and with multiple characteristics of variable multiplicity.
Christian Jah (7161323) +2 more
core +2 more sources
Alexandria Engineering JournalThis study investigates a fractional-order computer virus model using the Caputo derivative to capture memory effects in digital networks. The model classifies nodes into four compartments: susceptible (S), latent (L), actively infected (B), and ...
Emad Solouma +4 more
doaj +1 more source
3D Character Reconstruction from Hand‐drawn Model Sheets
Computer Graphics Forum, EarlyView.Abstract Hand‐drawn model sheets are widely used in character design to define 3D shape and appearance through sparse multi‐view drawings. Reconstructing 3D characters from such sparse inputs has traditionally been challenging due to insufficient visual information.
Hyejeong Yoon +3 more
wiley +1 more source
Journal of MathematicsThis study addresses the critical public health challenge posed by the Zika virus (ZIKV), a pathogen with complex multiroute transmission dynamics. We develop a novel discrete fractional-order mathematical model to accurately capture the intrapopulation ...
A. El-Mesady +4 more
doaj +1 more source
Reinforcement Learning for Jump‐Diffusions, With Financial Applications
Mathematical Finance, EarlyView.ABSTRACT We study continuous‐time reinforcement learning (RL) for stochastic control in which system dynamics are governed by jump‐diffusion processes. We formulate an entropy‐regularized exploratory control problem with stochastic policies to capture the exploration–exploitation balance essential for RL.
Xuefeng Gao, Lingfei Li, Xun Yu Zhou
wiley +1 more source