Article
Computer Science, Information Systems
Krisztian Gado, Tamas Orosz
Summary: This paper discusses a novel solution for the multi-objective TEAM benchmark problem, which focuses on optimizing the shape of a coil to achieve uniform field distribution and robust design. Symmetrical solutions were found to perform better in terms of uniformity and sensitivity measures, but some asymmetric solutions previously neglected can be competitive and interesting for practical design.
Article
Computer Science, Interdisciplinary Applications
Hyan Candido Guedes, Joao Luiz Junho Pereira, Guilherme Ferreira Gomes
Summary: This study aims to develop and parametrically optimize a high-performance composite material using interpolation strategy, thickness variations, and the number of layers. Four different multi-objective optimizers were evaluated to minimize total mass and evaluate the Tsai-Wu failure criterion under different loading conditions. The MOPSO algorithm demonstrated superior robustness and significantly improved the optimal solution compared to the initial model.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Engineering, Multidisciplinary
Sallam A. Kouritem, Mohammed I. Abouheaf, Nabil Nahas, Mohamed Hassan
Summary: This paper introduces a multi-objective design mechanism to minimize the initial and running costs of industrial robot arms. It utilizes stress analysis to determine the material and physical dimensions of the robot arm, as well as vibration analysis for material architecture selection. The paper presents design equations and optimization algorithms for the robot arm's performance improvement.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
N. Ganesh, Uvaraja Ragavendran, Kanak Kalita, Paras Jain, Xiao-Zhi Gao
Summary: This paper combines high-fidelity finite element method (FEM) with metaheuristic optimization algorithms to propose a method for optimizing composite plates. The study found that the performance of this method in multi-objective Pareto optimization is comparable to NSGA-III.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Computer Science, Interdisciplinary Applications
Dario Carbonaro, Agnese Lucchetti, Alberto L. Audenino, Thomas Gries, Ted J. Vaughan, Claudio Chiastra
Summary: This study proposes a computational optimization procedure to enhance the mechanical performance of bioresorbable braided stents for the treatment of critical limb ischemia. Finite element analyses were performed to investigate the impact of design parameters on the stent's mechanical performance. The optimization framework successfully identified optimal design candidates and contributes to the advancement of innovative bioresorbable braided stents.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Computer Science, Information Systems
Ata Khalili, Shayan Zargari, Qingqing Wu, Derrick Wing Kwan Ng, Rui Zhang
Summary: This study investigates resource allocation in a multiuser IRS-aided SWIPT system by optimizing energy/information beamforming vectors and IRS phase shifts to balance data sum-rate and total harvested energy. Simulation results demonstrate a superior performance of the proposed scheme in competing objectives compared to baseline schemes.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Chemistry, Physical
Takashi Matsuoka, Tamaki Nakano, Satoshi Yamaguchi, Shinji Ono, Shota Watanabe, Takumi Sato, Hirofumi Yatani
Summary: This study investigated the mechanical influences of the implant-abutment connection type and inter-implant distance on the inter-implant bone using three-dimensional finite element analysis. The results showed that a CC implant is advantageous for maintenance of the inter-implant bone, and regardless of the connection type, the stress of the inter-implant bone increases as the inter-implant distance decreases.
Article
Computer Science, Information Systems
Pedro Augusto de Castro E Castro, Lenin Martins Ferreira Morais, Thiago Ribeiro de Oliveira
Summary: The paper aims to present a unified computational tool to assist designers in finding the optimal design for a given power electronic converter. A comparison is shown between the traditional industrial design approach and a multi-objective optimization approach using Pareto analysis for a 10 kVA UPS. The use of the proposed computational tool resulted in a UPS with improved power density and efficiency.
Article
Materials Science, Multidisciplinary
Zongchao Liu, Gongfa Chen, Chiwei Ong, Zhiyong Yao, Xiaoda Li, Jun Deng, Fangsen Cui
Summary: This study designed and verified an aortic stent-graft by optimizing a specially constructed commercial descending stent-graft. The optimization process, using surrogate modeling and multi-objective genetic algorithms, resulted in improved flexibility and radial support force of the stent-graft. The results provide guidelines and a feasible method for designing aortic arch stent-grafts.
MATERIALS & DESIGN
(2023)
Article
Engineering, Chemical
Ji-Chang Son, Kyung-Pyo Yi, Dong-Kuk Lim
Summary: The internal division point genetic algorithm (IDP-GA) proposed in this paper aims to lessen the computational burden of multi-variable multi-objective optimization problems, such as optimal design of electric bicycles, using finite element analysis. The algorithm considers various objectives and reduces the number of function calls with novel strategies, demonstrating superiority over conventional optimization methods. The applicability of IDP-GA in practical electric machine design was verified by successfully improving the design of an electric bicycle propulsion motor.
Article
Dentistry, Oral Surgery & Medicine
Pietro Ausiello, Alessandro Espedito Di Lauro, Joao Paulo Mendes Tribst, David C. Watts
Summary: This study aimed to evaluate the influence of new resin-based CAD-CAM implant-supported materials on posterior crown restoration stress and strain concentrations. The finite element analysis revealed differences in stress distribution among different resin materials. The Estelite P Block material showed lower tensile and shear stresses compared to other resin-based materials.
Article
Mathematics
Mohamed Afifi, Hegazy Rezk, Mohamed Ibrahim, Mohamed El-Nemr
Summary: The design of switched reluctance machine (SRM) is challenging due to its non-linear relationships with performance indices, leading to the use of optimization techniques like the multi-objective Jaya algorithm to achieve better diversity and optimal solutions. The research focused on optimizing SRM design using the MO-Jaya algorithm, which resulted in improved objective values and a variety of optimal solutions through broad search.
Article
Computer Science, Interdisciplinary Applications
Ahmet Gullu, Seda Goktepe Korpeoglu, Elif Sila Selek Kilicarslan
Summary: Different mathematical optimization techniques, namely sequential quadratic programming, gradient-based method, and Lagrange multiplier method, are employed to improve the seismic performance and energy dissipative characteristics of energy dissipative steel cushion. Results showed that the gradient-based method requires fewer function evaluations to converge, while the Lagrange multiplier method with a Hessian produces more accurate results. Geometric dimension ratios for the optimal sizing of steel cushions are provided based on optimization studies.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Engineering, Multidisciplinary
Maolin Shi, Chaoyong Zong, Hongyou Li, Yuying Shi
Summary: This study proposes a multi-output model based on extreme learning machine, which utilizes the regression information of training samples and the correlation of outputs to predict multiple responses for new data. Experimental results demonstrate that the proposed model outperforms the benchmark model in terms of prediction accuracy and computational cost.
ENGINEERING OPTIMIZATION
(2023)
Article
Chemistry, Physical
Amanda Guedes Nogueira Matuda, Marcos Paulo Motta Silveira, Guilherme Schmitt de Andrade, Amanda Maria de Oliveira Dal Piva, Joao Paulo Mendes Tribst, Alexandre Luiz Souto Borges, Luca Testarelli, Gabriella Mosca, Pietro Ausiello
Summary: The study found that using bulk-fill flowable composite resin significantly reduces the magnitude of polymerization shrinkage stress. The larger the cavity and the volume of material needed to restore the tooth, the greater the residual stress on enamel and dentin tissue.
Article
Mechanics
George Youssef, Somer Nacy, Scott Newacheck
Summary: This paper introduces an enhanced mechanistic analytical model to analyze the magnetoelectric response considering the geometry of a concentric cylinder structure, the effect of an elastic bonding layer, and mechanical boundary conditions. By modifying the continuity condition and introducing a normalized stiffness parameter, the elastic properties and geometry of the bonding layer are incorporated into the magneto-electro-elastic effective media theory. The results of this study can be applied in the development of efficient energy harvesters or frequency-consistent magnetic field sensors by manipulating the mechanical and bonding conditions.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Materials Science, Multidisciplinary
Kazi Zahir Uddin, Nicholas Pagliocca, Ibnaj Anamika Anni, George Youssef, Behrad Koohbor
Summary: This study investigates the relationships between global and local strain fields in rectangular center-symmetric perforated planar structures, highlighting the role of local morphology on the macroscopic material response.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Mechanics
Nha Uyen Huynh, Behrad Koohbor, George Youssef
Summary: Polyurea, an elastomeric polymer, exhibits time-dependent creep deformation and material properties due to its microstructure. In this study, digital image correlation (DIC) analysis was used to investigate the creep behavior of polyurea. The results showed that polyurea displayed typical creep response and shear softening behavior under uniaxial loading conditions. The strain contour maps revealed localized strain and three distinct molecular relaxation processes. These findings are important for the development of polyurea-based impact-mitigating structures.
MECHANICS OF TIME-DEPENDENT MATERIALS
(2023)
Article
Polymer Science
Nha Uyen Huynh, Behrad Koohbor, George Youssef
Summary: This study utilizes in situ light-matter interactions to investigate the molecular contributions to the superior mechanical behavior of elastomers with segmental microstructure. Through various experimental techniques, including digital image correlation, terahertz spectral analyses, and light scattering approaches, the researchers uncover the extent of microstructural mobility and elucidate the mechanisms responsible for the shock tolerance in these materials. This research provides insights into the elusive molecular mobility and conformational changes during mechanical loading.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Polymer Science
Ramiro Mantecon, Miguel Marco, Ana Munoz-Sanchez, George Youssef, Jose Diaz-Alvarez, Henar Miguelez
Summary: “The investigated 3D-printed human skulls” can serve as anatomically-correct surrogates in head impact tests, providing important clinical and research implications.
Article
Materials Science, Multidisciplinary
Nha Uyen Huynh, George Youssef
Summary: Temporary and permanent macromolecular conformational changes can occur in elastomers under high strain rate loading, leading to mechanical failure. This paper presents the first in-operando spectromechanical characterization of elastomeric polymers using terahertz-based spectroscopy and laser-induced shock wave, providing new insights into the mechanical behavior of polymers under shock loading.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Hamidreza Moradi, H. Timothy Bunnell, Bradley S. Price, Maryam Khodaverdi, Michael T. Vest, James Z. Porterfield, Alfred J. Anzalone, Susan L. Santangelo, Wesley Kimble, Jeremy Harper, William B. Hillegass, Sally L. Hodder
Summary: A machine learning model was developed using gradient boosted decision tree, deep learning, and convolutional neural network algorithms to predict patient outcomes and analyze the impacts of treatment combinations for COVID-19. The model showed that combined treatment with anticoagulants and steroids had the highest probability of improvement, followed by anticoagulants and targeted antivirals. Monotherapies of single drugs, such as anticoagulants without steroids or antivirals, were associated with poorer outcomes.
Article
Materials Science, Multidisciplinary
Mark Smeets, Behrad Koohbor, George Youssef
Summary: This research explores the density gradation of foam structures as a means to enhance the mechanical efficiency of protective padding. Adhesive-free, discrete density gradation of foam sheets is achieved by utilizing the properties of frothed foam slurry to naturally bond and penetrate cured foam sheets. Compared to monolayer, mono-density foam, the seamless, graded foam samples demonstrated improved mechanical performance. Irrespective of gradation and interface type, polyurea foam outperformed benchmark foam in terms of specific energy absorption, efficiency, and ideality. The study also highlights the fabrication method for adhesive-free density-graded foam structures, the use of diverse key performance indicators (KPIs) to assess foam efficacy, and the superiority of polyurea foam-based lightweight protective paddings. Future research will focus on the dynamic performance of graded foam structures under impact loading at various velocities.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Anil Singh, Vincent Ngo, Nha Uyen Huynh, Behrad Koohbor, George Youssef
Summary: This research evaluates the mechanical response of composite lattice structures fabricated using vat photopolymerization additive manufacturing process and printable particulate composite materials. The study investigates the effect of cell geometry and reinforcement on structural behavior. The outcomes are imperative for developing advanced protective structures.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mark Smeets, Paul Kauvaka, Kazi Uddin, Behrad Koohbor, George Youssef
Summary: This research investigates the deformation of ungraded and graded foams under quasistatic and impact scenarios using digital image correlation. The interface effect on the mechanical performance of polyurea foam is revealed, showing drastic differences between the deformations within each layer. This research substantiates the importance of interfacing and gradation strategies on the mechanical response of elastomeric foams.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Mathematics, Applied
Russell G. Keanini, Jerry Dahlberg, Philip Brown, Mehdi Morovati, Hamidreza Moradi, Donald Jacobs, Peter T. Tkacik
Summary: In this paper, a stochastic method is presented for estimating Green's functions (GF's) in linear advection-diffusion-reaction transport problems. The technique allows the construction of approximate, high-accuracy GF's in arbitrary geometries, which addresses the main challenge in obtaining Green's function solutions. The proposed method offers various applications, such as obtaining sets of solutions, acting as models in inverse problems, and serving as process models in thermal and mass transport design and optimization. The paper provides guidelines for parameter selection and is tested against known problems.
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Article
Instruments & Instrumentation
Amritesh Kumar, Scott Newacheck, George Youssef
Summary: This article investigates the application of magnetoelectric (ME) composites in wireless energy transfer (WET) and examines the influence of parameters such as magnetization state, relative orientation, and distance on power conversion efficiency. The results show that a higher energy conversion efficiency can be achieved with a configuration where a laminated plate is used as the transmitter and ring composites act as the receiver.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Computer Science, Information Systems
Hamidreza Moradi, Wei Wang, Dakai Zhu
Summary: Cloud computing is widely adopted for its flexibility and low cost, but resource sharing among multiple tenants can lead to variations in application performance. This article proposes online learning methodologies for performance prediction of multi-tenant cloud applications. By utilizing micro-benchmarks to evaluate CPU, memory, and I/O components of virtual machines, predictive models can be derived using regression or neural network techniques. The proposed schemes are evaluated on private and public clouds, showing that prediction errors can be reduced with periodic retraining and progressive modeling approaches.
IEEE TRANSACTIONS ON CLOUD COMPUTING
(2023)
Article
Materials Science, Characterization & Testing
Nha Uyen Huynh, Amritesh Kumar, Maryam Ghorbani, George Youssef
Summary: This research investigates the failure behavior of polyurea elastomers under high strain loading conditions using a novel experimental setup. The results show that the polyurea samples exhibit compression-shear and tensile-shear failure modes under different stress states, accompanied by surface depression, micro-voids and microcracks nucleation, and small planes formation.
Article
Engineering, Mechanical
Somer Nacy, Behrad Koohbor, George Youssef
Summary: Frequency analysis is essential for revealing spectral features in time domain data and gaining insights into the dynamics of structures and materials. This study demonstrates the applicability of frequency-domain analysis for low-velocity impact scenarios, reporting important attributes of dynamic loading and material properties. The results show that the impact characteristics agree with previous reports based on time domain analysis, while also revealing the frequency dependence of acceleration and strain rate on foam density and impact energy.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)