Results 11 to 20 of about 6,234,642 (356)

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, Chen Cheng, Yuxin Chen, Yuting Wei, Yuejie Chi   +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

Pilot Study on the Forehead Skin Microbiome and Short Chain Fatty Acids Depending on the SC Functional Index in Korean Cohorts

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, Karina Arellano, Yuri Lee, Subin Yeo, Yosep Ji, Joontae Ko, Wilhelm Holzapfel   +6 more
doaj   +1 more source

Selection of Bacteriocinogenic Bacillus spp. from Traditional Fermented Korean Food Products with Additional Beneficial Properties

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, Joanna Ivy Irorita Fugaban, Clarizza May Dioso, Jorge Enrique Vazquez Bucheli, Wilhelm Heinrich Holzapfel, Svetoslav Dimitrov Todorov   +5 more
doaj   +1 more source

Bacteriocinogenic Bacillus spp. Isolated from Korean Fermented Cabbage (Kimchi)—Beneficial or Hazardous?

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, Jorge Enrique Vazquez Bucheli, Wilhelm Heinrich Holzapfel, Svetoslav Dimitrov Todorov   +3 more
doaj   +1 more source

Characterization of Partially Purified Bacteriocins Produced by Enterococcus faecium Strains Isolated from Soybean Paste Active Against Listeria spp. and Vancomycin-Resistant Enterococci

Microorganisms, 2021
Three out of one hundred eighty putative LAB isolates from Korean traditional fermented soybean paste were identified to be unique and bacteriocinogenic strains.
Joanna Ivy Irorita Fugaban, Jorge Enrique Vazquez Bucheli, Wilhelm Heinrich Holzapfel, Svetoslav Dimitrov Todorov   +3 more
doaj   +1 more source

Assessment of Bacteriocin-Antibiotic Synergy for the Inhibition and Disruption of Biofilms of Listeria monocytogenes and Vancomycin-Resistant Enterococcus

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, Jorge Enrique Vazquez Bucheli, Wilhelm Heinrich Holzapfel, Svetoslav Dimitrov Todorov   +3 more
doaj   +1 more source

Combined Action of Antibiotics and Bacteriocins against Vancomycin-Resistant Enterococci

Microorganisms, 2022
Antibiotics have been one of the most important discoveries in the area of applied medical microbiology; however, as a result of various factors, we are currently facing a dramatic and relatively dangerous increase in the number of cases of antibiotic ...
Jorge Enrique Vazquez Bucheli, Joanna Ivy Irorita Fugaban, Wilhelm Heinrich Holzapfel, Svetoslav Dimitrov Todorov   +3 more
doaj   +1 more source

Global Convergence of Policy Gradient Methods to (Almost) Locally Optimal Policies [PDF]

SIAM Journal of Control and Optimization, 2019
Policy gradient (PG) methods are a widely used reinforcement learning methodology in many applications such as video games, autonomous driving, and robotics.
K. Zhang, Alec Koppel, Haoqi Zhu, T. Başar   +3 more
semanticscholar   +1 more source

Globally convergent evolution strategies [PDF]

Mathematical Programming, 2014
In this paper we show how to modify a large class of evolution strategies (ES's) for unconstrained optimization to rigorously achieve a form of global convergence, meaning convergence to stationary points independently of the starting point. The type of ES under consideration recombines the parent points by means of a weighted sum, around which the ...
Diouane, Youssef, Gratton, Serge, Vicente, Luis Nunes   +2 more
openaire   +6 more sources