Alexandria Engineering Journal

Papers
(The median citation count of Alexandria Engineering Journal is 5. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2020-03-01 to 2024-03-01.)
ArticleCitations
Modeling the dynamics of novel coronavirus (2019-nCov) with fractional derivative525
Hall and ion slip effects on unsteady MHD free convective rotating flow through a saturated porous medium over an exponential accelerated plate259
Hall and ion slip impacts on unsteady MHD convective rotating flow of heat generating/absorbing second grade fluid170
Investigation of cross-fluid flow containing motile gyrotactic microorganisms and nanoparticles over a three-dimensional cylinder169
Analysis of fractal fractional differential equations162
Intelligent human computer interaction based on non redundant EMG signal153
Modelling and analysis of fractal-fractional partial differential equations: Application to reaction-diffusion model138
A new comparative study on the general fractional model of COVID-19 with isolation and quarantine effects134
Differential evolution: A recent review based on state-of-the-art works132
Effect of two different fins (longitudinal-tree like) and hybrid nano-particles (Mo120
Absorption cooling systems – Review of various techniques for energy performance enhancement118
Evaluation of flow pattern recognition and void fraction measurement in two phase flow independent of oil pipeline’s scale layer thickness118
Heat transport and nonlinear mixed convective nanomaterial slip flow of Walter-B fluid containing gyrotactic microorganisms115
Thermally radioactive bioconvection flow of Carreau nanofluid with modified Cattaneo-Christov expressions and exponential space-based heat source112
Feasibility of utilising second life EV batteries: Applications, lifespan, economics, environmental impact, assessment, and challenges108
Deep learning in mammography images segmentation and classification: Automated CNN approach106
Numerical investigation and sensitivity analysis on bioconvective tangent hyperbolic nanofluid flow towards stretching surface by response surface methodology106
Flow and heat transfer of hybrid nanofluid over a permeable shrinking cylinder with Joule heating: A comparative analysis105
A review of the hybrid artificial intelligence and optimization modelling of hydrological streamflow forecasting104
Principal component analysis to study the relations between the spread rates of COVID-19 in high risks countries103
On a new and generalized fractional model for a real cholera outbreak103
Dynamical characteristic of analytical fractional solitons for the space-time fractional Fokas-Lenells equation101
A new mobile application of agricultural pests recognition using deep learning in cloud computing system99
Grasping force prediction based on sEMG signals97
Comparative study of the performance of air and geothermal sources of heat pumps cycle operating with various refrigerants and vapor injection97
On a fractional hybrid integro-differential equation with mixed hybrid integral boundary value conditions by using three operators96
Tracking and collision avoidance of virtual coupling train control system94
A novel design of fractional Meyer wavelet neural networks with application to the nonlinear singular fractional Lane-Emden systems92
Adsorptive removal of methylene blue and acid orange 10 dyes from aqueous solutions using oil palm wastes-derived activated carbons91
Numerical analysis of 3-D MHD hybrid nanofluid over a rotational disk in presence of thermal radiation with Joule heating and viscous dissipation effects using Lobatto IIIA technique91
Bioconvection analysis for Sutterby nanofluid over an axially stretched cylinder with melting heat transfer and variable thermal features: A Marangoni and solutal model90
New optical solitary wave solutions of Fokas-Lenells equation in optical fiber via Sine-Gordon expansion method90
Can transfer function and Bode diagram be obtained from Sumudu transform88
Efficient English text classification using selected Machine Learning Techniques88
On a nonlinear fractional order model of dengue fever disease under Caputo-Fabrizio derivative86
New results on nonlocal functional integro-differential equations via Hilfer fractional derivative86
Unsteady mixed convection flow of magneto-Williamson nanofluid due to stretched cylinder with significant non-uniform heat source/sink features86
Cu-Al2O3/water hybrid nanofluid flow over a permeable moving surface in presence of hydromagnetic and suction effects86
Numerical analysis of higher order chemical reaction on electrically MHD nanofluid under influence of viscous dissipation85
A combined method for short-term traffic flow prediction based on recurrent neural network85
Liquid cooling techniques in proton exchange membrane fuel cell stacks: A detailed survey84
Evaluation of one dimensional fuzzy fractional partial differential equations83
An efficient numerical scheme for fractional model of HIV-1 infection of CD82
Fractional simulation for Darcy-Forchheimer hybrid nanoliquid flow with partial slip over a spinning disk82
Design of a hybrid NAR-RBFs neural network for nonlinear dusty plasma system81
Jaya optimization algorithm for transient response and stability enhancement of a fractional-order PID based automatic voltage regulator system80
Spatiotemporal prediction of air quality based on LSTM neural network79
Review of artificial neural networks for gasoline, diesel and homogeneous charge compression ignition engine77
Effect of injection parameters and producer gas derived from redgram stalk on the performance and emission characteristics of a diesel engine77
MHD mixed convection of localized heat source/sink in an Al2O3-Cu/water hybrid nanofluid in L-shaped cavity77
Flow of hybrid CNTs past a rotating sphere subjected to thermal radiation and thermophoretic particle deposition77
Integrated neuro-swarm heuristic with interior-point for nonlinear SITR model for dynamics of novel COVID-1977
Boiling heat transfer characteristics of graphene oxide nanoplatelets nano-suspensions of water-perfluorohexane (C6F14) and water-n-pentane76
Impact of heated obstacle position on magneto-hybrid nanofluid flow in a lid-driven porous cavity with Cattaneo-Christov heat flux pattern76
Mixed convection flow over an exponentially stretching/shrinking vertical surface in a hybrid nanofluid75
Dynamical analysis of the nonlinear complex fractional emerging telecommunication model with higher–order dispersive cubic–quintic75
Automatic diagnosis of COVID-19 disease using deep convolutional neural network with multi-feature channel from respiratory sound data: Cough, voice, and breath74
Stability analysis of MHD hybrid nanofluid flow over a stretching/shrinking sheet with quadratic velocity74
Age-Structured Modeling of COVID-19 Epidemic in the USA, UAE and Algeria74
A polypyrrole/GO/ZnO nanocomposite modified pencil graphite electrode for the determination of andrographolide in aqueous samples72
Banana stem based activated carbon as a low-cost adsorbent for methylene blue removal: Isotherm, kinetics, and reusability71
Comparative analysis of Gated Recurrent Units (GRU), long Short-Term memory (LSTM) cells, autoregressive Integrated moving average (ARIMA), seasonal autoregressive Integrated moving average (SARIMA) f71
A machine learning-based intrusion detection for detecting internet of things network attacks71
Applications of modified Darcy law and nonlinear thermal radiation in bioconvection flow of micropolar nanofluid over an off centered rotating disk71
Computational assessment of hybrid nanofluid flow with the influence of hall current and chemical reaction over a slender stretching surface70
Mixed radiated magneto Casson fluid flow with Arrhenius activation energy and Newtonian heating effects: Flow and sensitivity analysis69
Interfacial layer and shape effects of modified Hamilton’s Crosser model in entropy optimized Darcy-Forchheimer flow69
A new model of fractional Casson fluid based on generalized Fick’s and Fourier’s laws together with heat and mass transfer69
Double image encryption algorithm based on compressive sensing and elliptic curve68
Magnetohydrodynamics (MHD) boundary layer flow of hybrid nanofluid over a moving plate with Joule heating68
On modelling of epidemic childhood diseases with the Caputo-Fabrizio derivative by using the Laplace Adomian decomposition method67
A novel ant colony algorithm for solving shortest path problems with fuzzy arc weights67
Efficient 3D Deep Learning Model for Medical Image Semantic Segmentation67
Viral dynamics and control of hepatitis B virus (HBV) using an epidemic model66
Analysis of a Covid-19 model: Optimal control, stability and simulations65
Bearing defect size assessment using wavelet transform based Deep Convolutional Neural Network (DCNN)65
Novel computational and accurate numerical solutions of the modified Benjamin–Bona–Mahony (BBM) equation arising in the optical illusions field64
Predicting kerf quality characteristics in laser cutting of basalt fibers reinforced polymer composites using neural network and chimp optimization64
Novel fixed point approach to Atangana-Baleanu fractional and L64
The Schrödinger-KdV equation of fractional order with Mittag-Leffler nonsingular kernel64
Brownian motion and thermophoretic diffusion impact on Darcy-Forchheimer flow of bioconvective micropolar nanofluid between double disks with Cattaneo-Christov heat flux64
Heat transfers thermodynamic activity of a second-grade ternary nanofluid flow over a vertical plate with Atangana-Baleanu time-fractional integral64
Irreversibility analysis of Cu-TiO2-H2O hybrid-nanofluid impinging on a 3-D stretching sheet in a porous medium with nonlinear radiation: Darcy-Forchhiemer’s model63
Experimental investigation of single pass solar air heater with reflectors and turbulators63
A denoising method for ship radiated noise based on Spearman variational mode decomposition, spatial-dependence recurrence sample entropy, improved wavelet threshold denoising, and Savitzky-Golay filt62
A future prospects and current scenario of aluminium metal matrix composites characteristics62
Analytical approach for time fractional wave equations in the sense of Yang-Abdel-Aty-Cattani via the homotopy perturbation transform method62
Flow of hybrid nanofluid through Darcy-Forchheimer porous space with variable characteristics61
Heat and mass transfer phenomenon for the dynamics of Casson fluid through porous medium over shrinking wall subject to Lorentz force and heat source/sink61
Oil spill sorption capacity of raw and thermally modified orange peel waste60
Numerical solutions of time-fractional Klein-Gordon equations by clique polynomials60
Effects of hybrid nanofluid on novel fractional model of heat transfer flow between two parallel plates60
An application of preservation technology in inventory control system with price dependent demand and partial backlogging60
A novel Covid-19 model with fractional differential operators with singular and non-singular kernels: Analysis and numerical scheme based on Newton polynomial60
A-MobileNet: An approach of facial expression recognition60
An efficient numerical technique for solving time fractional Burgers equation59
6G Mobile Communication Technology: Requirements, Targets, Applications, Challenges, Advantages, and Opportunities59
Miniaturization of microwave planar circuits using composite microstrip/coplanar-waveguide transmission lines59
The role of prostitution on HIV transmission with memory: A modeling approach58
The state of renewable energy development in South Africa: An overview58
Numerical computations for Buongiorno nano fluid model on the boundary layer flow of viscoelastic fluid towards a nonlinear stretching sheet58
A Survey on blockchain for industrial Internet of Things58
AN OTSU image segmentation based on fruitfly optimization algorithm58
Design and numerical analysis of an extremely sensitive PCF-based sensor for detecting kerosene adulteration in petrol and diesel57
Effect of magnetic field and thermal radiation on natural convection in a square cavity filled with TiO2 nanoparticles using Tiwari-Das nanofluid model57
Analysis of energy consumption and potential energy savings of an institutional building in Malaysia57
Self-adjusting force/bit blending control based on quantitative factor-scale factor fuzzy-PID bit control56
Computational and theoretical modeling of the transmission dynamics of novel COVID-19 under Mittag-Leffler Power Law56
Radiation effect on MHD Casson fluid flow over an inclined non-linear surface with chemical reaction in a Forchheimer porous medium56
Grasping posture of humanoid manipulator based on target shape analysis and force closure56
Equilibrium optimizer based multi dimensions operation of hybrid AC/DC grids56
Developing an efficient deep neural network for automatic detection of COVID-19 using chest X-ray images55
Novel exact solutions of the fractional Bogoyavlensky–Konopelchenko equation involving the Atangana-Baleanu-Riemann derivative55
An improved artificial ecosystem optimization algorithm for optimal configuration of a hybrid PV/WT/FC energy system55
Characteristics of heat transfer and fluid flow in microchannel heat sinks with rectangular grooves and different shaped ribs55
A novel Approach for Fully Intuitionistic Fuzzy Multi-Objective Fractional Transportation Problem54
A comprehensive review on current advances of thermal energy storage and its applications54
Approximate solution for solving nonlinear fractional order smoking model53
A new artificial ecosystem-based optimization integrated with Nelder-Mead method for PID controller design of buck converter53
A model for describing the velocity of a particle in Brownian motion by Robotnov function based fractional operator53
Fabrication of ZnO-Ag bimetallic nanoparticles by laser ablation for anticancer activity52
Fractional ARIMA with an improved cuckoo search optimization for the efficient Short-term power load forecasting52
Drug delivery system based on magnetic iron oxide nanoparticles coated with (polyvinyl alcohol-zinc/aluminium-layered double hydroxide-sorafenib)52
Exploring the physical properties of PVA/PEG polymeric material upon doping with nano gadolinium oxide52
Accuracy Assessment of Low-Cost Unmanned Aerial Vehicle (UAV) Photogrammetry52
Hybridization of artificial intelligence models with nature inspired optimization algorithms for lake water level prediction and uncertainty analysis52
Revisiting critical delay factors for construction: Analysing projects in Malaysia52
Numerical study of MHD hybrid nanofluid flow between two coaxial cylinders52
Thermophoresis particle deposition analysis for nonlinear thermally developed flow of Magneto-Walter’s B nanofluid with buoyancy forces52
Applying wind energy as a clean source for reverse osmosis desalination: A comprehensive review52
Fault diagnosis on the bearing of traction motor in high-speed trains based on deep learning52
A critical review of the recent developments in micro–nano bubbles applications for domestic and industrial wastewater treatment51
Modeling and analysis of competition model of bank data with fractal-fractional Caputo-Fabrizio operator51
New numerical approximation for Chua attractor with fractional and fractal-fractional operators51
Thermal radiation, chemical reaction, Hall and ion slip effects on MHD oscillatory rotating flow of micro-polar liquid50
Performance analysis of 40 Gb/s free space optics transmission based on orbital angular momentum multiplexed beams50
Multi-objective optimization modelling of sustainable green supply chain in inventory and production management50
Qualitative analysis of fractal-fractional order COVID-19 mathematical model with case study of Wuhan50
Chemical reaction impact on MHD dissipative Casson-Williamson nanofluid flow over a slippery stretching sheet through porous medium49
An explicit plethora of solution for the fractional nonlinear model of the low–pass electrical transmission lines via Atangana–Baleanu derivative operator49
Efficient sustainable algorithm for numerical solutions of systems of fractional order differential equations by Haar wavelet collocation method49
Unsteady transient slip flow of Williamson nanofluid containing gyrotactic microorganism and activation energy49
Fractal fractional-order derivative for HIV/AIDS model with Mittag-Leffler kernel49
Analysis of some generalized ABC – Fractional logistic 48
Exponentiated transformation of Gumbel Type-II distribution for modeling COVID-19 data48
A supply chain model with service level constraints and strategies under uncertainty48
Nonlinear fractional mathematical model of tuberculosis (TB) disease with incomplete treatment under Atangana-Baleanu derivative48
Cost analysis of activated sludge and membrane bioreactor WWTPs using CapdetWorks simulation program: Case study of Tikrit WWTP (middle Iraq)48
Prediction studies of the epidemic peak of coronavirus disease in Brazil via new generalised Caputo type fractional derivatives47
Haar wavelet collocation approach for the solution of fractional order COVID-19 model using Caputo derivative47
A computational frame work on magnetohydrodynamic dissipative flow over a stretched region with cross diffusion: Simultaneous solutions47
Modeling and optimal control analysis of transmission dynamics of COVID-19: The case of Ethiopia47
Dynamics of water conveying SWCNT nanoparticles and swimming microorganisms over a Riga plate subject to heat source/sink47
A comparative study on the role of nanoparticle dispersion in electroosmosis regulated peristaltic flow of water46
Numerical simulation of simulate an anomalous solute transport model via local meshless method46
Nonlinear mixed convective nanofluid flow about a rough sphere with the diffusion of liquid hydrogen46
Heuristic computational design of Morlet wavelet for solving the higher order singular nonlinear differential equations45
Experimental and numerical investigation of the effect of blade number on the aerodynamic performance of a small-scale horizontal axis wind turbine45
Enhancing trays solar still performance using wick finned absorber, nano- enhanced PCM45
An epidemic prediction from analysis of a combined HIV-COVID-19 co-infection model via ABC-fractional operator44
An insight on VMD for diagnosing wind turbine blade faults using C4.5 as feature selection and discriminating through multilayer perceptron44
A hybrid SEM-neural network method for identifying acceptance factors of the smart meters in Malaysia: Challenges perspective44
Analysis of entropy generation for MHD flow of viscous fluid embedded in a vertical porous channel with thermal radiation44
Heat transfer of Maxwell base fluid flow of nanomaterial with MHD over a vertical moving surface44
A comprehensive mathematical structuring of magnetically effected Sutterby fluid flow immersed in dually stratified medium under boundary layer approximations over a linearly stretched surface44
A numerical schemes and comparisons for fixed point results with applications to the solutions of Volterra integral equations in 44
Analysis of nonlinear vibration of nano/microelectromechanical system switch induced by electromagnetic force under zero initial conditions44
On doubly stratified bioconvective transport of Jeffrey nanofluid with gyrotactic motile microorganisms44
Numerical analysis of the fractional evolution model for heat flow in materials with memory44
Application of optical fiber nanotechnology in power communication transmission43
Financial agglomeration, technological innovation, and green total factor energy efficiency43
A combined deep learning application for short term load forecasting43
Mathematical analysis about influence of Lorentz force and interfacial nano layers on nanofluids flow through orthogonal porous surfaces with injection of SWCNTs42
A computational approach for solving time fractional differential equation via spline functions42
A novel improved marine predators algorithm for combined heat and power economic dispatch problem42
The new solitary wave structures for the (2 + 1)-dimensional time-fractional Schrodinger equation and the space-time nonlinear conformable fractional Bogoyavlenskii equations42
Impact of activation energy and MHD on Williamson fluid flow in the presence of bioconvection42
Thermal capability and entropy optimization for Prandtl-Eyring hybrid nanofluid flow in solar aircraft implementation42
Micropolar flow of EMHD nanofluid with nonlinear thermal radiation and slip effects42
On beta-time fractional biological population model with abundant solitary wave structures42
A mathematical COVID-19 model considering asymptomatic and symptomatic classes with waning immunity42
A new efficient technique using Laplace transforms and smooth expansions to construct a series solution to the time-fractional Navier-Stokes equations42
Power transformer insulation system: A review on the reactions, fault detection, challenges and future prospects42
Multi-feature fusing local directional ternary pattern for facial expressions signal recognition based on video communication system41
Impacts of lorentz force and chemical reaction on peristaltic transport of Jeffrey fluid in a penetrable channel with injection/suction at walls41
A deep learning architecture for multi-class lung diseases classification using chest X-ray (CXR) images41
Heat transport in CNTs based nanomaterial flow of non-Newtonian fluid having electro magnetize plate41
Transportation of slip effects on nanomaterial micropolar fluid flow over exponentially stretching41
A blockchain-based hybrid platform for multimedia data processing in IoT-Healthcare40
Heat absorption/generation effect on MHD heat transfer fluid flow along a stretching cylinder with a porous medium40
An overview on energy and exergy analysis of solar thermal collectors with passive performance enhancers40
On new computational and numerical solutions of the modified Zakharov–Kuznetsov equation arising in electrical engineering40
Analytical treatment of radiative Casson fluid over an isothermal inclined Riga surface with aspects of chemically reactive species40
Series solutions for nonlinear time-fractional Schrödinger equations: Comparisons between conformable and Caputo derivatives40
Control of COVID-19 dynamics through a fractional-order model39
Entropy generation for the blood flow in an artery with multiple stenosis having a catheter39
Performance evaluation of 6.4 Tbps dual polarization quadrature phase shift keying Nyquist-WDM superchannel FSO transmission link: Impact of different weather conditions39
An MRI-based deep learning approach for accurate detection of Alzheimer’s disease39
Intelligent fuzzy-based controllers for voltage stability enhancement of AC-DC micro-grid with D-STATCOM39
Slip velocity and temperature jump effects on molybdenum disulfide MoS2 and silicon oxide SiO2 hybrid nanofluid near irregular 3D surface39
Exact travelling wave solution for the local fractional Camassa-Holm-Kadomtsev-Petviashvili equation39
Effect of thermal radiation and volume fraction on carbon nanotubes based nanofluid flow inside a square chamber39
Effect of palm-sesame biodiesel fuels with alcoholic and nanoparticle additives on tribological characteristics of lubricating oil by four ball tribo-tester38
Electro-osmotically driven generalized Newtonian blood flow in a divergent micro-channel38
Performance enhancement of photovoltaic cells using phase change material (PCM) in winter38
Optical biosensors: a decade in review38
Numerical exploration of MHD falkner-skan-sutterby nanofluid flow by utilizing an advanced non-homogeneous two-phase nanofluid model and non-fourier heat-flux theory38
Evolutionary game analysis on the selection of green and low carbon innovation between manufacturing enterprises38
Multi-objective task scheduling optimization in cloud computing based on fuzzy self-defense algorithm38
Parallel genetic algorithms for optimizing the SARIMA model for better forecasting of the NCDC weather data38
Safety risk identification and prioritize of forest logging activities using analytic hierarchy process (AHP)38
Adsorption characteristics of paracetamol removal onto activated carbon prepared from Cannabis sativum Hemp38
Visually asymmetric image encryption algorithm based on SHA-3 and compressive sensing by embedding encrypted image38
Supply chain financial service management system based on block chain IoT data sharing and edge computing37
A comparison between fuzzy AHP and fuzzy TOPSIS methods to software requirements selection37
On analysis of magnetized viscous fluid flow in permeable channel with single wall carbon nano tubes dispersion by executing nano-layer approach37
Lyapunov stability and wave analysis of Covid-19 omicron variant of real data with fractional operator37
Automated image identification, detection and fruit counting of top-view pineapple crown using machine learning37
Impact of artificial roughness variation on heat transfer and friction characteristics of solar air heating system37
MHD mixed convection flow of a hybrid nanofluid past a permeable vertical flat plate with thermal radiation effect37
Unsteady natural convection flow due to fractional thermal transport and symmetric heat source/sink37
Performance improvement of off-grid hybrid renewable energy system using dynamic voltage restorer37
Evaluating the effect of minimum quantity lubrication during hard turning of AISI D3 steel using vegetable oil enriched with nano-additives37
An interference-tolerant fast convergence zeroing neural network for dynamic matrix inversion and its application to mobile manipulator path tracking36
An experimental validation of a new shape optimization technique for piezoelectric harvesting cantilever beams36
Lie group analysis of upper convected Maxwell fluid flow along stretching surface36
Numerical study for bio-convection flow of tangent hyperbolic nanofluid over a Riga plate with activation energy36
Exact solitary wave solutions of fractional modified Camassa-Holm equation using an efficient method36
Hybrid price and stock dependent inventory model for perishable goods with advance payment related discount facilities under preservation technology36
A robust study of a piecewise fractional order COVID-19 mathematical model36
Investigation of gas sensor based on differential optical absorption spectroscopy using photonic crystal fiber36
Non-Newtonian nanofluid natural convective heat transfer in an inclined Half-annulus porous enclosure using FEM36
Simultaneous design of fuzzy PSS and fuzzy STATCOM controllers for power system stability enhancement36
Hybrid Harris hawks optimization with sequential quadratic programming for optimal coordination of directional overcurrent relays incorporating distributed generation35
Allocation of distributed generations in radial distribution systems using adaptive PSO and modified GSA multi-objective optimizations35
Adsorption of heavy metals and hardness ions from groundwater onto modified zeolite: Batch and column studies35
The hemodynamics of variable liquid properties on the MHD peristaltic mechanism of Jeffrey fluid with heat and mass transfer35
On the analysis of Caputo fractional order dynamics of Middle East Lungs Coronavirus (MERS-CoV) model35
Stability of three degrees-of-freedom auto-parametric system35
Energy recovery system in small reverse osmosis desalination plant: Experimental and theoretical investigations35
Marine Predator Algorithm based Cascaded PIDA Load Frequency Controller for Electric Power Systems with Wave Energy Conversion Systems35
Mixed convective flow of hybrid nanofluid over a heated stretching disk with zero-mass flux using the modified Buongiorno model35
Evaluation and influencing factors of China’s industrial water resource utilization efficiency from the perspective of spatial effect35
Ficus racemosa leaf extract for inhibiting steel corrosion in a hydrochloric acid medium35
Application of Gaussian process regression to forecast multi-step ahead SPEI drought index35
Removal of meloxicam, piroxicam and Cd+2 by Fe3O4/SiO2/glycidyl methacrylate-S-SH nanocomposite loaded with laccase35
A deep learning algorithm for modeling and forecasting of COVID-19 in five worst affected states of India35
On electroosmosis in peristaltic activity of MHD non-Newtonian fluid35
Impacts of land use change on ecosystem services in the intensive agricultural area of North China based on Multi-scenario analysis35
Non-standard computational analysis of the stochastic COVID-19 pandemic model: An application of computational biology34
0.044059991836548