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Chinese Journal of Mechanical Engineering 2016年第6期29卷 1067-1073页

作者： HUSSEIN abdullahi CHENG Kai College of Engineering Design and Physical Sciences Brunel University London

Aerospace manufacturing SMEs are continuously facing the challenge on managing their supply chain and complying with the aerospace manufacturing quality standard requirement due to their lack of resources and the nature of business. In this paper, the ERP system based approach is presented to quality control and assurance work in light of seamless integration of in-process production data and information internally and therefore managing suppliers more effectively and efficiently. The Aerospace Manufacturing Quality Assurance Standard （BS/EN9100） is one of the most recognised and essential protocols for developing the industry-operated-and-driven quality assurance systems. The research investigates using the ERP based system as an enabler to implement BS/EN9100 quality management system at manufacturing SMEs and the associated implementation and application perspectives. An application case study on a manufacturing SME is presented by using the SAP based implementation, which helps fiarther evaluate and validate the approach and application system development.

关键词： BS/EN 9100 Quality Assurance aerospace manufacturing ERP system aerospace quality assurance SAP programming

Enhanced Mechanism for Link Failure Rerouting in Software-Defined Exchange Point Networks

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Computers, Materials & Continua 2024年第9期80卷 4361-4385页

作者： Abdijalil abdullahi Selvakumar Manickam Department of Information Technology SIMAD UniversityMogadishu630Somalia National Advanced IPv6 Centre Universiti Sains MalaysiaPulua Pinang11800Malaysia

Internet Exchange Point(IXP)is a system that increases network bandwidth *** exchange points facilitate interconnection among network providers,including Internet Service Providers(ISPs)andContent Delivery Providers(CDNs).To improve service management,Internet exchange point providers have adopted the Software Defined Network(SDN)*** implementation is known as a Software-Defined Exchange Point(SDX).It improves network providers’operations and ***,performance issues still exist,particularly with multi-hop *** issues include switch memory costs,packet processing latency,and link failure recovery *** paper proposes Enhanced Link Failure Rerouting(ELFR),an improved mechanism for rerouting link failures in software-defined exchange point *** proposed mechanism aims to minimize packet processing time for fast link failure recovery and enhance path calculation efficiency while reducing switch storage overhead by exploiting the Programming Protocol-independent Packet Processors(P4)*** paper presents the proposed mechanisms’efficiency by utilizing advanced algorithms and demonstrating improved performance in packet processing speed,path calculation effectiveness,and switch storage management compared to current *** proposed mechanism shows significant improvements,leading to a 37.5%decrease in Recovery Time(RT)and a 33.33%decrease in both Calculation Time(CT)and Computational Overhead(CO)when compared to current *** study highlights the effectiveness and resource efficiency of the proposed mechanism in effectively resolving crucial issues inmulti-hop software-defined exchange point networks.

关键词： Link failure recovery Internet exchange point software-defined exchange point software-defined network multihop topologies

Awareness as the Most Effective Measure to Mitigate the Spread of COVID-19 in Nigeria

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Computers, Materials & Continua 2020年第12期65卷 1945-1957页

作者： Isa abdullahi Baba Dumitru Baleanu Department of Mathematical Sciences Bayero UniversityKanoNigeria Department of Mathematics Cankaya UniversityAnkaraTurkey Institute of Space Sciences BucharestRomania

A mathematical model consisting of a system of four nonlinear ordinary differential equations is *** aim is to study the dynamics of the spread of COVID-19 in Nigeria and to show the effectiveness of awareness and the need for relevant authorities to engage themselves more in enlightening people on the significance of the available control measures in mitigating the spread of the *** equilibrium solutions;Disease free equilibrium and Endemic equilibrium solutions were calculated and their global stability analysis was carried *** reproduction ratio(R0)was also obtained,in this research𝑅𝑅0=*** obtained for Nigeria is used to conduct numerical simulations in order to support the analytic result and to show the significance of awareness in controlling the disease *** the simulation result,it was shown that to mitigate the spread of COVID-19 in Nigeria there is need for serious awareness programs to enlighten people on the available control measures;social distancing,self-isolation,use of personal protective equipment(such as face mask,hand globes,overall gown,etc.),regular hand washing using soap or sanitizer,avoiding having contact with person showing the symptoms and reporting any suspected case.

关键词： COVID-19 model equilibrium solution basic reproduction ratio stability analysis numerical simulation Nigeria

New lump, lump-kink, breather waves and other interaction solutions to the (3+1)-dimensional soliton equation

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Communications in Theoretical Physics 2020年第8期72卷 43-49页

作者： Tukur Abdulkadir Sulaiman abdullahi Yusuf Abdon Atangana Department of Computer Engineering Biruni UniversityIstanbulTurkey Department of Mathematics Federal University DutseJigawaNigeria Institute for Groundwater Studies University of the Free StateBloemfonteinSouth Africa

This study investigates the (3+1)-dimensional soliton equation via the Hirota bilinear approach and symbolic computations. We successfully construct some new lump, lump-kink, breather wave, lump periodic, and some other new interaction solutions. All the reported solutions are verified by inserting them into the original equation with the help of the Wolfram Mathematica package. The solution’s visual characteristics are graphically represented in order to shed more light on the results obtained. The findings obtained are useful in understanding the basic nonlinear fluid dynamic scenarios as well as the dynamics of computational physics and engineering sciences in the related nonlinear higher dimensional wave fields.

关键词： (3+1)-dimensional soliton equation Hirota method lump solution breather waves

Dynamical rational solutions and their interaction phenomena for an extended nonlinear equation

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Communications in Theoretical Physics 2023年第3期75卷 1-11页

作者： Karmina K Ali abdullahi Yusuf Wen-Xiu Ma Department of Mathematics University of ZakhoZakhoIraq Department of Computer Engineering Biruni UniversityIstanbulTurkey Department of Computer Science and Mathematics LebaneseAmerican UniversityBeirutLebanon Department of Mathematics and Statistics University of South FloridaTampaFL 33620United States of America Department of Mathematics Zhejiang Normal UniversityJinhua 321004China Department of Mathematics King Abdulaziz UniversityJeddah 21589Saudi Arabia School of Mathematical and Statistical Sciences North-West UniversityMafikeng CampusMmabatho 2735South Africa

In this paper,we analyze the extended Bogoyavlenskii-Kadomtsev-Petviashvili(eBKP)equation utilizing the condensed Hirota's *** accordance with a logarithmic derivative transform,we produce solutions for single,double,and triple M-lump ***,we investigate the interaction solutions of a single M-lump with a single soliton,a single M-lump with a double soliton,and a double M-lump with a single ***,we create sophisticated single,double,and triple complex soliton wave *** extended Bogoyavlenskii-Kadomtsev-Petviashvili equation describes nonlinear wave phenomena in fluid mechanics,plasma,and shallow water *** selecting appropriate values for the related free parameters we also create three-dimensional surfaces and associated counter plots to simulate the dynamical characteristics of the solutions offered.

关键词： simplified Hirota's method lump solution mixed solution complex multiple soliton eBKP equation

Robust Control Strategy for Inductive Parametric Uncertainties of DC/DC Converters in Islanded DC Microgrid

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 335-344页

作者： Salisu abdullahi Tao Jin P.M.Lingom School of Electrical Engineering and Automation Fuzhou UniversityFuzhouChina

Direct current(DC) microgrid consists of many parallel power converters that share load currents through the inductance of DC/DC converters. Usually, the inductance parameters are dependent on the physical implementation of the system, and their values may not match their nameplates. Such disparities could lead to unequal response characteristics of the system, which can potentially reduce the performances of the DC microgrid operation. This paper proposes a robust control strategy for inductive parametric uncertainties of DC/DC converters using an optimal control method with integral action. To achieve such a goal, the system model parameters with nominal values are transformed into parametric unmatched uncertainties to form a robust control problem, which is then transformed into a linear quadratic regulator problem. The inductance uncertainties are stabilized with the uncertainty dynamic algebraic Riccati equation(UDARE) using state feedback gain under linear quadratic regulator. The closed-loop control with integral action is adopted to achieve a steady-state error of zero on the DC-link voltage at any uncertainty of the inductive parameter, which subsequently ensures the equal load current sharing. Off-line simulations and real-time validations based on OpalRT have been conducted to demonstrate the effectiveness and robustness of the proposed robust control strategy.

关键词： DC/DC converter DC microgrid OpalRT optimal control parametric uncertainty robust control

Radiological characterization of building materials used in Malaysia and assessment of external and internal doses

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Nuclear Science and Techniques 2019年第3期30卷 82-96页

作者： Shittu abdullahi Aznan Fazli Ismail Supian Samat Nuclear Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia (UKM) Department of Physics Faculty of Science Gombe State University Centre for Frontier Science Faculty of Science and Technology Universiti Kebangsaan Malaysia (UKM)

In this study, the activity concentrations of ^(226)Ra,^(232)Th,^(222)Rn, and ^(40)K, emanation fractions(P),equilibrium equivalent concentration(EEC), and mass exhalation rates(E_m) of radon released from building materials used in Malaysia were studied using gamma-ray spectrometer with HPGe detector. Radiological parameters[activity concentration index(ACI), indoor air-absorbed dose rate(D_(in)), annual effective dose(AED_(in)) from external and internal(E_(Rn)), soft tissues(H_(ST)) and lung(H_L), and effective dose equivalent(H_(eff))] were estimated to evaluate radiological hazards due to the use of these building materials: sand, cement, gravel, bricks, tiles, fly ash, white cement, and ceramic raw materials. The measured P, EEC,and E_m vary from 10 to 30%, 0.9 to 22 Bq m^(-3), and 33 to 674 mBq h^(-1) kg^(-1), respectively, while the calculated ACI and AED_(in) vary from 0.1 ± 0.01 to 2.1 ± 0.1 and 0.1 ± 0.01 to 2.4 ± 0.6 mSv y^(-1), respectively. On the other hand, the internal annual effective dose ranges from 0.1 to 1.4 mSv y^(-1). The estimated radiological risk parameters were below the recommended maximum values, and radiological hazards associated with building materials under investigation are therefore negligible.

关键词： Indoor radon Emanation fraction Equilibrium equivalent concentration Mass exhalation rate Annual effective dose Effective dose equivalent

FAIR Machine Learning Model Pipeline Implementation of COVID-19 Data

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Data Intelligence 2022年第4期4卷 971-990,1036页

作者： Sakinat Folorunso Ezekiel Ogundepo Mariam Basajja Joseph Awotunde abdullahi Kawu Francisca Oladipo abdullahi Ibrahim Department of Mathematical Sciences Olabisi Onabanjo UniversityP.M.B 2002Ago-IwoyeOgun StateNigeria 120005Nigeria Data Science Nigeria Lagos 105102Nigeria Leiden University 1011NCAmsterdamthe Netherlands Department of Computer Science University of IlorinIlorinKwara State240103Nigeria Department of Computer Science Ibrahim Badamosi UniversityLapaiNiger State911101Nigeria Kampala International University 260101Uganda Federal University Lokoja Nigeria Virus Outbreak Data Network-Africa

Research and development are gradually becoming data-driven and the implementation of the FAIR Guidelines(that data should be Findable, Accessible, Interoperable, and Reusable) for scientific data administration and stewardship has the potential to remarkably enhance the framework for the reuse of research data. In this way, FAIR is aiding digital transformation. The ‘FAIRification’ of data increases the interoperability and(re)usability of data, so that new and robust analytical tools, such as machine learning(ML) models, can access the data to deduce meaningful insights, extract actionable information, and identify hidden patterns. This article aims to build a FAIR ML model pipeline using the generic FAIRification workflow to make the whole ML analytics process FAIR. Accordingly, FAIR input data was modelled using a FAIR ML model. The output data from the FAIR ML model was also made FAIR. For this, a hybrid hierarchical k-means (HHK) clustering ML algorithm was applied to group the data into homogeneous subgroups and ascertain the underlying structure of the data using a Nigerian-based FAIR dataset that contains data on economic factors, healthcare facilities, and coronavirus occurrences in all the 36 states of Nigeria. The model showed that research data and the ML pipeline can be FAIRified, shared, and reused by following the proposed FAIRification workflow and implementing technical architecture.

关键词： FAIRification Semantic data model Cluster analysis FAIR data Metadata Machine learning model

Dynamics of Caputo fractional-order SIRV model:The effects of imperfect vaccination on disease transmission

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International Journal of Biomathematics 2024年第4期17卷 267-285页

作者： Auwal abdullahi Mohd Hafiz Mohd Department of Mathematics and Computer Science Federal University Kashere Nigeria School of Mathematical Sciences Universiti Sains Malaysia 11800 USMPulau PinangMalaysia

Though vaccination protects individuals against many infectious diseases,such protection does not always last forever since a few vaccinated individuals could lose their lifelong immunity and eventually become *** study,therefore,determines the effects of imperfect vaccination and memory index on the spread of diseases through the Caputo fractional-order SIRV(Susceptible-Infected-Recovered-Vaccinated)epidemic *** properties of the new model including the conditions for the existence of a unique solution determined through the fixed-point theory and the conditions for the existence of a positive solution of the model obtained via the Mittag-Leffler function along with the Laplace transformation-are thoroughly ***,our simulation results report that an increase in the imperfect vaccination force increases the population of infected *** the memory effect,the higher“memory”the epidemic system has of past states(which corresponds to decreasing values of fractionalorder parameter),the greater the peaks and magnitudes of infection shaping the epidemiological system dynamics.

关键词： Vaccination model fractional-order model Caputo fractional-order derivative Mittag-Leffer function fixed-point theory

Elevated temperature creep model of parallel wire strands

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 1060-1071页

作者： Yong DU Yongjin WU abdullahi M.UMAR Shaojun ZHU College of Civil Engineering Nanjing Tech UniversityNanjing 211816China College of Civil Engineering Tongji UniversityShanghai 200092China*Corresponding author.E-mail:zhushaojun@***

T Parallel wire strands(PWSs),which are widely used in prestressed steel structures,are typically in highstress *** fire conditions,significant creep effects occur,reducing the prestress and influencing the mechanical behavior of *** there is no existing approach to analyze their creep behavior,this study experimentally investigated the elevated temperature creep model of PWSs.A charge-coupled camera system was incorporated to accurately obtain the deformation of the specimen during the elevated temperature creep *** was concluded that the temperature level had a more significant effect on the creep strain than the stress level,and 450℃ was the key segment point where the creep rate varied *** comparing the elevated temperature creep test results for PWSs and steel strands,it was found that the creep strain of PWSs was lower than that of steel strands at the same temperature and stress *** parameters in the general empirical formula,the Bailey–Norton model,and the composite timehardening model were fitted based on the experimental *** evaluating the accuracy and form of the models,the composite time-hardening model,which can simultaneously consider temperature,stress,and time,is recommended for use in the fire-resistance design of pre-tensioned structures with PWSs.

关键词： parallel wire strands experimental study elevated temperature creep model