Results 1 to 10 of about 6,438,675 (354)
Global convergence of COVID-19 basic reproduction number and estimation from early-time SIR dynamics [PDF]
PLoS One, 2020 The SIR ('susceptible-infectious-recovered') formulation is used to uncover the generic spread mechanisms observed by COVID-19 dynamics globally, especially in the early phases of infectious spread.
Katul GG +4 more
europepmc +3 more sources
Gradient Descent with Random Initialization: Fast Global Convergence for Nonconvex Phase Retrieval. [PDF]
Math Program, 2019 This paper considers the problem of solving systems of quadratic equations, namely, recovering an object of interest x♮∈Rn\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage ...
Chen Y, Chi Y, Fan J, Ma C.
europepmc +3 more sources
On the Global Convergence of Particle Swarm Optimization Methods [PDF]
Applied Mathematics and Optimization, 2022 In this paper we provide a rigorous convergence analysis for the renowned particle swarm optimization method by using tools from stochastic calculus and the analysis of partial differential equations.
Hui Huang, Jinniao Qiu, Konstantin Riedl
semanticscholar +1 more source
Global Convergence of Policy Gradient Primal–Dual Methods for Risk-Constrained LQRs [PDF]
IEEE Transactions on Automatic Control, 2021 While the techniques in optimal control theory are often model-based, the policy optimization (PO) approach directly optimizes the performance metric of interest. Even though it has been an essential approach for reinforcement learning problems, there is
Feiran Zhao, Keyou You, T. Başar
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Fast Global Convergence of Natural Policy Gradient Methods with Entropy Regularization [PDF]
Operational Research, 2020 Preconditioning and Regularization Enable Faster Reinforcement Learning Natural policy gradient (NPG) methods, in conjunction with entropy regularization to encourage exploration, are among the most popular policy optimization algorithms in contemporary ...
Shicong Cen +4 more
semanticscholar +1 more source
A Two-Level ADMM Algorithm for AC OPF With Global Convergence Guarantees [PDF]
IEEE Transactions on Power Systems, 2020 This paper proposes a two-level distributed algorithmic framework for solving the AC optimal power flow (OPF) problem with convergence guarantees. The presence of highly nonconvex constraints in OPF poses significant challenges to distributed algorithms ...
Kaizhao Sun, X. Sun
semanticscholar +1 more source
Microorganisms, 2021 Dry skin is one of the indicators of a compromised skin barrier. An intact skin barrier is not only important to reserve the hydration within the epidermal tissue but also to protect our skin from environmental stressors and inhibit pathogen invasion ...
Haryung Park +6 more
doaj +1 more source
Fermentation, 2021 Two Bacillus spp. isolated from kimchi, Bacillus tequilensis ST816CD and Bacillus subtilis ST830CD, were characterized for their antimicrobial properties and safety. The proteinaceous nature of their inhibitory metabolites was confirmed after exposure to
Gee Hyeun Choi +5 more
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Fermentation, 2021 Bacillus velezensis ST03 and ST32, Bacillus amyloliquefaciens ST06 and ST109, and Bacillus subtilis ST08 were isolated from artisanal-produced kimchi and were identified based on 16S rRNA partial sequencing.
Joanna Ivy Irorita Fugaban +3 more
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Microbiology Research, 2022 In this study, we have evaluated the effects of previously characterized bacteriocins produced by E. faecium strains ST651ea, ST7119ea, and ST7319ea, against biofilm formation and biofilms formed by L.
Joanna Ivy Irorita Fugaban +3 more
doaj +1 more source