Results 31 to 40 of about 7,237,549 (190)

Reformulating mixed-integer quadratically constrained quadratic programs [PDF]

open access: yes, 2011
It is well known that semidefinite programming (SDP) can be used to derive useful relaxations for a variety of optimisation problems. Moreover, in the particular case of mixed-integer quadratic programs, SDP has been used to reformulate problems, rather ...
Galli, L, Letchford, A. N.
core   +4 more sources

Nonlinear Transient Thermal Modeling and Analysis of a Convective-Radiative Fin with Functionally Graded Material in a Magnetic Environment

open access: yesModelling and Simulation in Engineering, 2019
Nonlinear transient thermal analysis of a convective-radiative fin with functionally graded materials (FGMs) under the influence of magnetic field is presented in this study.
M. G. Sobamowo   +2 more
doaj   +1 more source

A Multiagent Transfer Function Neuroapproach to Solve Fuzzy Riccati Differential Equations

open access: yesJournal of Applied Mathematics, 2014
A numerical solution of fuzzy quadratic Riccati differential equation is estimated using a proposed new approach for neural networks (NN). This proposed new approach provides different degrees of polynomial subspaces for each of the transfer function ...
Mohammad Shazri Shahrir   +3 more
doaj   +1 more source

Optimal control of multiphase steel production

open access: yesJournal of Mathematics in Industry, 2019
An optimal control problem for the production of multiphase steel is investigated that takes into account phase transformations in the steel slab. The state equations are a semilinear heat equation coupled with an ordinary differential equation, that ...
Dietmar Hömberg   +2 more
doaj   +1 more source

Measurement‐based wide‐area damping of inter‐area oscillations based on MIMO identification

open access: yesIET Generation, Transmission & Distribution, 2020
Interconnected power grid exhibits oscillatory response after a disturbance in the system. One such type of oscillation, the inter‐area oscillation has the oscillation frequency in the range of 0.1–1 Hz.
Abilash Thakallapelli   +1 more
doaj   +1 more source

Numerical simulation of vortex induced vibrations of a circular cylinder: isothermal and heat transfer cases [PDF]

open access: yesE3S Web of Conferences, 2019
In this paper, the Fluid Structure Interaction (FSI) problem - vortex induced vibration of a circular cylinder are studied using a numerical method. An accurate Harten Lax and van Leer with contact for artificial compressibility (HLLC-AC) Riemann solver ...
Sonawane C R, More Y B, Pandey Anand
doaj   +1 more source

Analysis of difference-frequency wave loads and quadratic transfer functions on a restrained semi-submersible floating wind turbine

open access: yesOcean Engineering, 2021
Abstract One of the concerns regarding numerical simulation of floating wind turbines (FWTs) in waves is underprediction of resonant responses in the low-frequency range. In the present work, the difference-frequency wave loads on a restrained semi-submersible FWT subject to bichromatic waves are investigated by higher-fidelity tools (Computational ...
Haoran Li, Erin E. Bachynski-Polić
openaire   +1 more source

Hydrodynamic Simulation of the Semi-Submersible Wind Float by Investigating Mooring Systems in Irregular Waves

open access: yesApplied Sciences, 2020
The present study aims to implement the software ANSYS AQWA to discuss the hydrodynamic analysis of the DeepCwind semi-submersible floating platform in waves based on the potential flow theory by considering the second-order wave exciting force.
Yu-Hsien Lin, Cheng-Hao Yang
doaj   +1 more source

A quantum particle swarm optimization-based optimal LQR-PID controller for load frequency control of an isolated power system

open access: yesJournal of Engineering and Applied Science, 2023
One of the characteristics of a robust power grid is minimal variations in its frequency to load change or loss in generating unit(s). From the perspective of optimal control theory, the issue of load frequency control in the context of the ...
Ebunle Akupan Rene   +1 more
doaj   +1 more source

EVALUATION OF QUALITY INDICATORS OF FUNCTIONING CYBER PROTECTION MANAGEMENT SYSTEMS OF INFORMATION SYSTEMS

open access: yesКомпютерні системи та інформаційні технології, 2022
Evidence of the complexity of the cybersecurity problem is the rapid increase in the number of information security breaches and losses on cybersecurity threats combined with an increase in the average loss from each of the breaches.
Volodymyr KHOROSHKO   +2 more
doaj   +1 more source

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