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Demongeot J, Magal P. Data-driven mathematical modeling approaches for COVID-19: A survey. Phys Life Rev 2024; 50:166-208. [PMID: 39142261 DOI: 10.1016/j.plrev.2024.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2024] [Accepted: 08/02/2024] [Indexed: 08/16/2024]
Abstract
In this review, we successively present the methods for phenomenological modeling of the evolution of reported and unreported cases of COVID-19, both in the exponential phase of growth and then in a complete epidemic wave. After the case of an isolated wave, we present the modeling of several successive waves separated by endemic stationary periods. Then, we treat the case of multi-compartmental models without or with age structure. Eventually, we review the literature, based on 260 articles selected in 11 sections, ranging from the medical survey of hospital cases to forecasting the dynamics of new cases in the general population. This review favors the phenomenological approach over the mechanistic approach in the choice of references and provides simulations of the evolution of the number of observed cases of COVID-19 for 10 states (California, China, France, India, Israel, Japan, New York, Peru, Spain and United Kingdom).
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Affiliation(s)
- Jacques Demongeot
- Université Grenoble Alpes, AGEIS EA7407, La Tronche, F-38700, France.
| | - Pierre Magal
- Department of Mathematics, Faculty of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, China; Univ. Bordeaux, IMB, UMR 5251, Talence, F-33400, France; CNRS, IMB, UMR 5251, Talence, F-33400, France
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2
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Oduro MS, Arhin-Donkor S, Asiedu L, Kadengye DT, Iddi S. SARS-CoV-2 incidence monitoring and statistical estimation of the basic and time-varying reproduction number at the early onset of the pandemic in 45 sub-Saharan African countries. BMC Public Health 2024; 24:612. [PMID: 38409118 PMCID: PMC10895859 DOI: 10.1186/s12889-024-18184-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 02/22/2024] [Indexed: 02/28/2024] Open
Abstract
The world battled to defeat a novel coronavirus 2019 (SARS-CoV-2 or COVID-19), a respiratory illness that is transmitted from person to person through contacts with droplets from infected persons. Despite efforts to disseminate preventable messages and adoption of mitigation strategies by governments and the World Health Organization (WHO), transmission spread globally. An accurate assessment of the transmissibility of the coronavirus remained a public health priority for many countries across the world to fight this pandemic, especially at the early onset. In this paper, we estimated the transmission potential of COVID-19 across 45 countries in sub-Saharan Africa using three approaches, namely, [Formula: see text] based on (i) an exponential growth model (ii) maximum likelihood (ML) estimation and (iii) a time-varying basic reproduction number at the early onset of the pandemic. Using data from March 14, 2020, to May 10, 2020, sub-Saharan African countries were still grappling with COVID-19 at that point in the pandemic. The region's basic reproduction number ([Formula: see text]) was 1.89 (95% CI: 1.767 to 2.026) using the growth model and 1.513 (95% CI: 1.491 to 1.535) with the maximum likelihood method, indicating that, on average, infected individuals transmitted the virus to less than two secondary persons. Several countries, including Sudan ([Formula: see text]: 2.03), Ghana ([Formula: see text]: 1.87), and Somalia ([Formula: see text]: 1.85), exhibited high transmission rates. These findings highlighted the need for continued vigilance and the implementation of effective control measures to combat the pandemic in the region. It is anticipated that the findings in this study would not only function as a historical record of reproduction numbers during the COVID-19 pandemic in African countries, but can serve as a blueprint for addressing future pandemics of a similar nature.
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Affiliation(s)
- Michael Safo Oduro
- Pfizer Research & Development, PSSM Data Sciences, Pfizer, Inc, Groton, CT, USA.
- Department of Applied Statistics and Research Methods, University of Northern Colorado, Greeley, Colorado, USA.
| | - Seth Arhin-Donkor
- Market Finance Analysis - Sr - Prd - Regional, Humana Inc., Louisville, Kentucky, USA
| | - Louis Asiedu
- Department of Statistics and Actuarial Sciences, University of Ghana, Accra, Ghana
| | - Damazo T Kadengye
- Data Synergy and Evaluation, African Population and Health Research Center, Manga Close, Nairobi, Kenya
- Department of Economics and Statistics, Kabale University, Kabale, Uganda
| | - Samuel Iddi
- Department of Statistics and Actuarial Sciences, University of Ghana, Accra, Ghana
- Data Synergy and Evaluation, African Population and Health Research Center, Manga Close, Nairobi, Kenya
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Salichos L, Warrell J, Cevasco H, Chung A, Gerstein M. Genetic determination of regional connectivity in modelling the spread of COVID-19 outbreak for more efficient mitigation strategies. Sci Rep 2023; 13:8470. [PMID: 37231011 DOI: 10.1038/s41598-023-34959-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 05/10/2023] [Indexed: 05/27/2023] Open
Abstract
For the COVID-19 pandemic, viral transmission has been documented in many historical and geographical contexts. Nevertheless, few studies have explicitly modeled the spatiotemporal flow based on genetic sequences, to develop mitigation strategies. Additionally, thousands of SARS-CoV-2 genomes have been sequenced with associated records, potentially providing a rich source for such spatiotemporal analysis, an unprecedented amount during a single outbreak. Here, in a case study of seven states, we model the first wave of the outbreak by determining regional connectivity from phylogenetic sequence information (i.e. "genetic connectivity"), in addition to traditional epidemiologic and demographic parameters. Our study shows nearly all of the initial outbreak can be traced to a few lineages, rather than disconnected outbreaks, indicative of a mostly continuous initial viral flow. While the geographic distance from hotspots is initially important in the modeling, genetic connectivity becomes increasingly significant later in the first wave. Moreover, our model predicts that isolated local strategies (e.g. relying on herd immunity) can negatively impact neighboring regions, suggesting more efficient mitigation is possible with unified, cross-border interventions. Finally, our results suggest that a few targeted interventions based on connectivity can have an effect similar to that of an overall lockdown. They also suggest that while successful lockdowns are very effective in mitigating an outbreak, less disciplined lockdowns quickly decrease in effectiveness. Our study provides a framework for combining phylodynamic and computational methods to identify targeted interventions.
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Affiliation(s)
- Leonidas Salichos
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06520, USA.
- Biological and Chemical Sciences, New York Institute of Technology, Manhattan, NY, 10023, USA.
| | - Jonathan Warrell
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06520, USA
| | - Hannah Cevasco
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06520, USA
| | - Alvin Chung
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06520, USA
| | - Mark Gerstein
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06520, USA.
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA.
- Department of Computer Science, Yale University, New Haven, CT, 06520, USA.
- Center for Biomedical Data Science, Yale University, New Haven, CT, 06520, USA.
- Department of Statistics & Data Science, Yale University, New Haven, CT, 06520, USA.
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Rotejanaprasert C, Lawson AB, Maude RJ. Spatiotemporal reproduction number with Bayesian model selection for evaluation of emerging infectious disease transmissibility: an application to COVID-19 national surveillance data. BMC Med Res Methodol 2023; 23:62. [PMID: 36915077 PMCID: PMC10010957 DOI: 10.1186/s12874-023-01870-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/20/2023] [Indexed: 03/16/2023] Open
Abstract
BACKGROUND To control emerging diseases, governments often have to make decisions based on limited evidence. The effective or temporal reproductive number is used to estimate the expected number of new cases caused by an infectious person in a partially susceptible population. While the temporal dynamic is captured in the temporal reproduction number, the dominant approach is currently based on modeling that implicitly treats people within a population as geographically well mixed. METHODS In this study we aimed to develop a generic and robust methodology for estimating spatiotemporal dynamic measures that can be instantaneously computed for each location and time within a Bayesian model selection and averaging framework. A simulation study was conducted to demonstrate robustness of the method. A case study was provided of a real-world application to COVID-19 national surveillance data in Thailand. RESULTS Overall, the proposed method allowed for estimation of different scenarios of reproduction numbers in the simulation study. The model selection chose the true serial interval when included in our study whereas model averaging yielded the weighted outcome which could be less accurate than model selection. In the case study of COVID-19 in Thailand, the best model based on model selection and averaging criteria had a similar trend to real data and was consistent with previously published findings in the country. CONCLUSIONS The method yielded robust estimation in several simulated scenarios of force of transmission with computing flexibility and practical benefits. Thus, this development can be suitable and practically useful for surveillance applications especially for newly emerging diseases. As new outbreak waves continue to develop and the risk changes on both local and global scales, our work can facilitate policymaking for timely disease control.
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Affiliation(s)
- Chawarat Rotejanaprasert
- Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.
| | - Andrew B Lawson
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - Richard J Maude
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Harvard T.H. Chan School of Public Health, Harvard University, Cambridge, MA, USA
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
- The Open University, Milton Keynes, UK
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Chiang M, Shih L, Lu C, Fang S. The COVID-19 vaccine did not affect the basal immune response and menstruation in female athletes. Physiol Rep 2023; 11:e15556. [PMID: 36750121 PMCID: PMC9904960 DOI: 10.14814/phy2.15556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/06/2022] [Accepted: 12/14/2022] [Indexed: 06/18/2023] Open
Abstract
The COVID-19 pandemic restricted the regular training and competition program of athletes. Vaccines against COVID-19 are known to be beneficial for the disease; however, the unknown side effects of vaccines and postvaccination reactions have made some athletes hesitant to get vaccinated. We investigated the changes in inflammatory responses and menstrual cycles of female athletes before and after vaccination. Twenty female athletes were enrolled in this study. Blood was collected from each subject before the first COVID-19 vaccination and after the first and second vaccinations. Laboratory data, including white blood cell, neutrophil, lymphocyte, and platelet counts, and inflammatory markers, including NLR (neutrophil-to-lymphocyte ratio), PLR (platelet lymphocyte ratio), RPR (red cell distribution width to platelet ratio), SII (systemic immune-inflammation index), and NeuPla (neutrophil-platelet ratio), were analyzed statistically. The menstrual changes before and after vaccination and the side effects were collected by questionnaires. No significant changes in the laboratory data were found after the first and second shots when compared to those at prevaccination: white blood cell, neutrophil, lymphocyte, platelet, NLR, PLR, SII, RPR, and NeuPla (p > 0.05). In addition, there were no significant changes in the menstruation cycle or days of the menstrual period (p > 0.05). All side effects after vaccination were mild and subsided in 2 days. The blood cell counts, inflammatory markers, and menstruation of female athletes were not affected by COVID-19 vaccines.
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Affiliation(s)
- Ming‐Ru Chiang
- Department of PediatricsJen‐Ai HospitalTaichungTaiwan
- Department of Exercise Health ScienceNational Taiwan University of SportTaichungTaiwan
| | - Li‐Chun Shih
- Department of Obstetrics and Gynecology, Puli BranchTaichung Veterans General HospitalNantouTaiwan
| | - Chi‐Cheng Lu
- Institute of AthleticsNational Taiwan University of SportTaichungTaiwan
| | - Shih‐Hua Fang
- Institute of AthleticsNational Taiwan University of SportTaichungTaiwan
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Demongeot J, Magal P. Spectral Method in Epidemic Time Series: Application to COVID-19 Pandemic. BIOLOGY 2022; 11:biology11121825. [PMID: 36552333 PMCID: PMC9775943 DOI: 10.3390/biology11121825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND The age of infection plays an important role in assessing an individual's daily level of contagiousness, quantified by the daily reproduction number. Then, we derive an autoregressive moving average model from a daily discrete-time epidemic model based on a difference equation involving the age of infection. Novelty: The article's main idea is to use a part of the spectrum associated with this difference equation to describe the data and the model. RESULTS We present some results of the parameters' identification of the model when all the eigenvalues are known. This method was applied to Japan's third epidemic wave of COVID-19 fails to preserve the positivity of daily reproduction. This problem forced us to develop an original truncated spectral method applied to Japanese data. We start by considering ten days and extend our analysis to one month. CONCLUSION We can identify the shape for a daily reproduction numbers curve throughout the contagion period using only a few eigenvalues to fit the data.
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Affiliation(s)
| | - Pierre Magal
- Université Bordeaux, IMB, UMR 5251, F-33400 Talence, France
- CNRS, IMB, UMR 5251, F-33400 Talence, France
- Correspondence:
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Waku J, Oshinubi K, Demongeot J. Maximal reproduction number estimation and identification of transmission rate from the first inflection point of new infectious cases waves: COVID-19 outbreak example. MATHEMATICS AND COMPUTERS IN SIMULATION 2022; 198:47-64. [PMID: 35233146 PMCID: PMC8872795 DOI: 10.1016/j.matcom.2022.02.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 02/15/2022] [Accepted: 02/16/2022] [Indexed: 05/31/2023]
Abstract
The dynamics of COVID-19 pandemic varies across countries and it is important for researchers to study different kind of phenomena observed at different stages of the waves during the epidemic period. Our interest in this paper is not to model what happened during the endemic state but during the epidemic state. We proposed a continuous formulation of a unique maximum reproduction number estimate with an assumption that the epidemic curve is in form of the Gaussian curve and then compare the model with the discrete form and the observed basic reproduction number during the contagiousness period considered. Furthermore, we estimated the transmission rate from identification of the first inflection point of a wave of the curve of daily new infectious cases using the Bernoulli S-I (Susceptible-Infected) equation. We applied this new method to the real data from Cameroon COVID-19 outbreak both at national and regional levels. High correlation was observed between the socio-economic parameters and epidemiology parameters at regional level in Cameroon. Also, the method was applied to the second wave COVID-19 outbreak for the world data which is a period the phenomena we are considering were observed. Lastly, it was observed that the models presented results correspond with the epidemic dynamics in Cameroon and World data. We recommend that it is important to study what happened during the growth inflection point as some countries data did not climax.
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Affiliation(s)
- J Waku
- UMMISCO UMI IRD 209 & LIRIMA, University of Yaoundé I, P.O Box 337 Yaoundé, Cameroon
| | - K Oshinubi
- Laboratory AGEIS EA 7407, Team Tools for e-Gnosis Medical & Labcom CNRS/UGA/OrangeLabs Telecom4Health, Faculty of Medicine, University Grenoble Alpes (UGA), 38700 La Tronche, France
| | - J Demongeot
- Laboratory AGEIS EA 7407, Team Tools for e-Gnosis Medical & Labcom CNRS/UGA/OrangeLabs Telecom4Health, Faculty of Medicine, University Grenoble Alpes (UGA), 38700 La Tronche, France
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Estimating the course of the COVID-19 pandemic in Germany via spline-based hierarchical modelling of death counts. Sci Rep 2022; 12:9784. [PMID: 35697761 PMCID: PMC9191534 DOI: 10.1038/s41598-022-13723-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 05/26/2022] [Indexed: 12/13/2022] Open
Abstract
We consider a retrospective modelling approach for estimating effective reproduction numbers based on death counts during the first year of the COVID-19 pandemic in Germany. The proposed Bayesian hierarchical model incorporates splines to estimate reproduction numbers flexibly over time while adjusting for varying effective infection fatality rates. The approach also provides estimates of dark figures regarding undetected infections. Results for Germany illustrate that our estimates based on death counts are often similar to classical estimates based on confirmed cases; however, considering death counts allows to disentangle effects of adapted testing policies from transmission dynamics. In particular, during the second wave of infections, classical estimates suggest a flattening infection curve following the “lockdown light” in November 2020, while our results indicate that infections continued to rise until the “second lockdown” in December 2020. This observation is associated with more stringent testing criteria introduced concurrently with the “lockdown light”, which is reflected in subsequently increasing dark figures of infections estimated by our model. In light of progressive vaccinations, shifting the focus from modelling confirmed cases to reported deaths with the possibility to incorporate effective infection fatality rates might be of increasing relevance for the future surveillance of the pandemic.
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Sanyaolu A, Marinkovic A, Prakash S, Zhao A, Balendra V, Haider N, Jain I, Simic T, Okorie C. Post-acute Sequelae in COVID-19 Survivors: an Overview. SN COMPREHENSIVE CLINICAL MEDICINE 2022; 4:91. [PMID: 35411333 PMCID: PMC8985741 DOI: 10.1007/s42399-022-01172-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 03/28/2022] [Indexed: 12/30/2022]
Abstract
In the acute phase of SARS-CoV-2 infection, varying degrees of clinical manifestations have been noticed in patients. Some patients who recovered from the infection developed long-term effects which have become of interest to the scientific and medical communities, as it relates to pathogenesis and the multidisciplinary approach to treatment. Long COVID (long-term or long-haul) is the collective term used to define recovered individuals of SARS-CoV-2 infection who have presented with persistent COVID symptoms, as well as the emergence of disorders and complications. Following the review of literature from major scientific databases, this paper investigated long COVID and the resulting post-sequela effects on survivors, regardless of initial disease severity. The clinical manifestations and multisystem complications of the disease specifically, cardiovascular, neurologic and psychologic, hematologic, pulmonary, dermatologic, and other ailments were discussed. Patients with chronic COVID-19 were found to experience heart thrombosis leading to myocardial infarction, inflammation, lung fibrosis, stroke, venous thromboembolism, arterial thromboembolism, "brain fog", general mood dysfunctions, dermatological issues, and fatigue. As the disease continues to progress and spread, and with the emergence of new variants the management of these persisting symptoms will pose a challenge for healthcare providers and medical systems in the next period of the pandemic. However, more information is needed about long COVID, particularly concerning certain patient populations, variability in follow-up times, the prevalence of comorbidities, and the evolution of the spread of infection. Thus, continued research needs to be conducted concerning the disease pathology to develop preventative measures and management strategies to treat long COVID.
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Affiliation(s)
| | | | | | - Anne Zhao
- Stanford Health Care, Palo Alto, CA USA
| | | | - Nafees Haider
- All Saints University School of Medicine, Roseau, Dominica
| | - Isha Jain
- Windsor University School of Medicine, Kitts, Cayon Saint Kitts and Nevis
| | - Teodora Simic
- DePaul University, Lincoln Park Campus, Chicago, IL USA
| | - Chuku Okorie
- Union County College, Plainfield Campus, Plainfield, NJ USA
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El-Shorbagy M, El-Refaey AM. COVID-19: Mathematical growth vs. precautionary measures in China, KSA, and the USA. INFORMATICS IN MEDICINE UNLOCKED 2022; 28:100834. [PMID: 34977332 PMCID: PMC8713421 DOI: 10.1016/j.imu.2021.100834] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/21/2021] [Accepted: 12/21/2021] [Indexed: 02/08/2023] Open
Abstract
This paper aims to study the relation between precautionary measures that were taken by countries to prevent the spread of COVID-19 and its impact on its mathematical growth. In this paper, we study the development and growth of the epidemic during the first fifty days since its appearance in three countries: China, the Kingdom of Saudi Arabia (KSA), and the United States of America (USA). An optimization process is used to determine the parameters of the closest model that simulates the data during the specified period by using one of the evolutionary computation techniques, the grasshopper optimization algorithm (GOA). The study reveals that the strict precautionary measures of applying isolation and quarantine, preventing all gatherings, and a total curfew are the only way to prevent the spread of the epidemic exponentially as China did. Also, without any measures to slow its growth, COVID-19 will continue to spread steadily for months.
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Affiliation(s)
- M.A. El-Shorbagy
- Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia,Department of Basic Engineering Science, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt,Corresponding author. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia
| | - Adel M. El-Refaey
- Basic and Applied Science Department, College of Engineering and Technology, Arab Academy for Science, Technology and Maritime Transport, Smart Village Campus, Egypt
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