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Walsh Hadamard Transform Based Transceiver Design for SC-FDMA with Discrete Wavelet Transform

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China Communications 2017年第5期14卷 193-206页

作者： Arsla Khan Amna arif Tabassum Nawaz Sobia Baig Department of Electrical Engineering COMSATS Institute of Information TechnologyLahore Pakistan

This article proposes a new transceiver design for Single carrier frequency division multiple access(SCFDMA)system based on discrete wavelet transform(DWT). SCFDMA offers almost same structure as Orthogonal frequency division multiple access(OFDMA)with extra advantage of low Peak to Average Power Ratio(PAPR). Moreover,this article also suggests the application of Walsh Hadamard transform(WHT)for linear precoding(LP)to improve the PAPR performance of the system. Supremacy of the proposed transceiver over conventional Fast Fourier transform(FFT)based SCFDMA is shown through simulated results in terms of PAPR,spectral efficiency(SE)and bit error rate(BER).

关键词： multicarrier modulation orthogonal frequency division multiple access single carrier frequency division multiple access: fast Fourier transform discrete wavelet transform Walsh Hadamard transform

Optimal design of hybrid wind/photovoltaic electrolyzer for maximum hydrogen production using imperialist competitive algorithm

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 40-49页

作者： Arash KHALILNEJAD Aditya SUNDARARAJAN arif I.SARWAT Case Western Reserve University Florida International University

The rising demand for high-density power storage systems such as hydrogen,combined with renewable power production systems,has led to the design of optimal power production and storage *** this study,a wind and photovoltaic(PV)hybrid electrolyzer system,which maximizes the hydrogen production for a diurnal operation of the system,is designed and *** operation of the system is optimized using imperialist competitive algorithm(ICA).The objective of this optimization is to combine the PV array and wind turbine(WT)in a way that,for minimized average excess power generation,maximum hydrogen would be *** meteorological data of Miami is used for simulations.A framework of the advanced alkaline electrolyzer with the detailed electrochemical model is *** optimal system comprises a PV module with a power of 7.9 kW and a WT module with a power of 11 *** rate of hydrogen production is 0.0192 mol/s;an average Faraday efficiency of 86.9 *** electrolyzer works with 53.7 percent of its nominal *** availability of the wind for longer periods of time reflects the greater contribution of WT in comparison with PV towards the overall throughput of the system.

关键词： Electrolyzer Hydrogen Wind turbine Photovoltaic Imperialist competitive algorithm(ICA)

A Systematic Literature Review of Deep Learning Algorithms for Segmentation of the COVID-19 Infection

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Computers, Materials & Continua 2023年第6期75卷 5717-5742页

作者： Shroog Alshomrani Muhammad arif Mohammed A.Al Ghamdi Department of Computer Science College of Computer and Information SciencesUmm AlQura UniversityMakkah24231Saudi Arabia

Coronavirus has infected more than 753 million people,ranging in severity from one person to another,where more than six million infected people died ***-aided diagnostic(CAD)with artificial intelligence(AI)showed outstanding performance in effectively diagnosing this virus in *** tomography is a complementary diagnostic tool to clarify the damage of COVID-19 in the lungs even before symptoms appear in *** paper conducts a systematic literature review of deep learning methods for classifying the segmentation of COVID-19 infection in the *** used the methodology of systematic reviews and meta-analyses(PRISMA)flow *** research aims to systematically analyze the supervised deep learning methods,open resource datasets,data augmentation methods,and loss functions used for various segment shapes of COVID-19 infection from computerized tomography(CT)chest *** have selected 56 primary studies relevant to the topic of the *** have compared different aspects of the algorithms used to segment infected areas in the CT *** to deep learning in the segmentation of infected areas still need to be developed to predict smaller regions of infection at the beginning of their appearance.

关键词： COVID-19 segmentation chest CT images deep learning systematic review 2D and 3D supervised deep learning

PSO Based Controlled Six-phase Grid Connected Induction Generator for Wind Energy Generation

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CES Transactions on Electrical Machines and Systems 2021年第1期5卷 41-49页

作者： arif Iqbal Girish Kumar Singh Electrical Engineering Department Rajkiya Engineering College Ambedkar NagarUP 224122India Electrical Engineering Department Indian Institute of technology RoorkeeUttarakhand 247667India

This paper deals a detailed performance investigation of asymmetrical six-phase grid connected induction generator(GCIG)in two proposed configurations in variable speed *** the system development,regulation of DC-link voltage has been proposed using particle swarm optimization(PSO)based PI controller,ensuring the power flow to utility grid through back to back *** closed loop operation of asymmetrical six-phase GCIG using indirect field oriented control in different configurations has been carried out in Matlab/Simulink *** results have been verified using real time test results on virtual platform of Typhoon HIL supported with some experimental validation.

关键词： Six-phase induction generator particle swarm optimization(PSO) indirect field oriented control

The calculation of band gap energy in zinc oxide films

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Journal of Semiconductors 2015年第1期36卷 17-22页

作者： Ali arif Okba Belahssen Salim Gareh Said Benramache Electrical Engineering Department Faculty of Technology University of Biskra Algeria Laboratoire de Physique des Couches Minces et Applications (LPCMA) Université de Biskra Algeria Mechanical Engineering Department Faculty of Technology University of Biskra Algeria

We investigated the optical properties of undoped zinc oxide thin films as the n-type semiconductor;the thin films were deposited at different precursor molarities by ultrasonic spray and spray pyrolysis *** thin films were deposited at different substrate temperatures ranging between 200 and 500℃. In this paper, we present a new approach to control the optical gap energy of ZnO thin films by concentration of the ZnO solution and substrate temperatures from experimental data, which were published in international journals. The model proposed to calculate the band gap energy with the Urbach energy was investigated. The relation between the experimental data and theoretical calculation suggests that the band gap energies are predominantly estimated by the Urbach energies, film transparency, and concentration of the ZnO solution and substrate temperatures. The measurements by these proposal models are in qualitative agreements with the experimental data; the correlation coefficient values were varied in the range 0.96–0.99999, indicating high quality representation of data based on Equation（2）, so that the relative errors of all calculation are smaller than 4%. Thus, one can suppose that the undoped ZnO thin films are chemically purer and have many fewer defects and less disorder owing to an almost complete chemical decomposition and contained higher optical band gap energy.

关键词： ZnO thin films semiconductor band gap energy correlation

A solution of UAV localization problem using an interacting multiple nonlinear fuzzy adaptive H_(∞)models filter algorithm

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Chinese Journal of Aeronautics 2019年第4期32卷 978-990页

作者： Elzoghby MOSTAFA Li FU Arafa IBRAHIM.I. arif USMAN School of Automation Science and Electrical Engineering Beihang University School of Control and Automation MTCAl-Khalifa Al-Maamoon Street Kobry Elkobbah

The purpose of this research is to improve the robustness of the autonomous system in order to improve the position and velocity estimation of an Unmanned Aerial Vehicle(UAV).Therefore, new integrated SINS/GPS navigation scheme based on Interacting Multiple Nonlinear Fuzzy Adaptive H_∞ Models(IMM-NFAH_∞) filtering technique for UAV is presented. The proposed IMM-NFAH_∞ strategy switches between two different Nonlinear Fuzzy Adaptive H_∞(NFAH_∞) filters and each NFAH_∞ filter is based on different fuzzy logic inference systems. The newly proposed technique takes into consideration the high order Taylor series terms and adapts the nonlinear H_∞ filter based on different fuzzy inference systems via adaptive filter bounds(di),along with disturbance attenuation parameter c. Simulation analysis validates the performance of the proposed algorithm, and the comparison with nonlinear H_∞(NH_∞) filter and that with different NFAH_∞ filters demonstrate the effectiveness of UAV localization utilizing IMM-NFAH_∞ filter.

关键词： Interacting multiple models Integrated navigation system Multi-mode estimation Nonlinear fuzzy adaptive filter Sensor data fusion UAV localization

Survey on synchrophasor data quality and cybersecurity challenges, and evaluation of their interdependencies

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Journal of Modern Power Systems and Clean Energy 2019年第3期7卷 449-467页

作者： Aditya SUNDARARAJAN Tanwir KHAN Amir MOGHADASI arif I.SARWAT Florida International University

Synchrophasor devices guarantee situation awareness for real-time monitoring and operational visibility of smart grid. With their widespread implementation,significant challenges have emerged, especially in communication, data quality and cybersecurity. The existing literature treats these challenges as separate problems,when in reality, they have a complex interplay. This paper conducts a comprehensive review of quality and cybersecurity challenges for synchrophasors, and identifies the interdependencies between them. It also summarizes different methods used to evaluate the dependency and surveys how quality checking methods can be used to detect potential cyberattacks.

关键词： Synchrophasor Data quality Cybersecurity Methodology

Is omentectomy necessary in the treatment of benign or malignant abdominal pathologies?A systematic review

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World Journal of Gastrointestinal Surgery 2021年第11期13卷 1497-1508页

作者： arif Atay Osman Nuri Dilek Department of Surgery İzmir Katip Celebi University School of MedicineAtatürk Education and Research Hospitalİzmir 35150Turkey

BACKGROUND The omentum is an organ that is easily sacrificed during abdominal *** scope of omentectomy and whether a routine omentectomy should be performed are still *** To review the literature in order to determine the physiological functions of the omentum and the roles it plays in pathological events in order to reveal the necessity for removal and preservation of the *** A clinical review of the English language literature based on the MEDLINE(PubMed)database was conducted using the keywords:“abdomen”,“gastrointestinal”,“tumor”,“inflammation”,“omental flap”,“metastasis”,“omentum”,and“omentectomy”.In addition,reports were also identified by systematically reviewing all references in retrieved *** The omentum functions as a natural barrier in areas where pathological processes occur in the abdominal *** omentum limits and controls inflammatory and infectious pathologies that occur in the *** also aids in treatment due to its cellular functions including lymphatic drainage and *** shows similar behavior in tumors,but it cannot cope with increasing tumor *** stage of the disease changes due to the tumor mass it tries to ***,it is considered an indicator of poor *** to this feature,the omentum is one of the first organs to be sacrificed during surgical ***,there are many unknowns regarding the role and efficacy of the omentum in *** The omentum is a unique organ that limits and controls inflammatory processes,foreign masses,and lesions that develop in the abdominal *** flaps can be used in all anatomical areas,including the thorax,abdomen,pelvis,and *** omentum is an organ that deserves the title of the abdominal *** is generally accepted that the omentum should be removed in cases where there is tumor ***,the positive or negative contribution of omental resection in the treatment of abdominal path

关键词： Abdomen Inflammation Stomach Omentectomy Omentum Tumor

Determining the environmental and atmospheric effects of coronavirus disease 2019(COVID-19)quarantining by studying the total aerosol optical depth,black carbon,organic matter,and sulfate in Blida City of Algeria

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Global Health Journal 2021年第1期5卷 37-43页

作者： Foued Chabane Ali arif Department of Mechanical Engineering Faculty of Science and Technology University of BiskraBiskra 07000Algeria Department of Electrical Engineering Faculty of Technology University of BiskraBiskra 07000Algeria

Background:To study,estimate and discuss the variations of the aerosol optical depth(AOD),black carbon,sulfate and organic matter,in the atmosphere in Blida City of Algeria,which was greatly affected by COVID-19 ***:We analyzed the effects of changes in the total AOD,black carbon,sulfate,and organic matter in the atmosphere(λ=550 nm)in the same period of 2019 and 2020,following the COVID-19 epidemic in Blida City,which was the most-affected city in ***:The quarantine that was enacted to limit the spread of COVID-19 resulted in side effects that were identifiable in the total AOD and in some of its atmospheric *** these variables in 2019 and 2020(in the months during the quarantine)revealed that in April,the BCAOD values were much lower in 2020than in ***:Based on the effects of the emerging COVID-19,the research listed the changes received from the AOD,and is considered as a comparative study and represents a significant side effect of the quarantine that was mainly designed to limit COVID-19.

关键词： Coronavirus disease 2019(COVID-19) Aerosol optical depth(AOD) Black carbon Organic matter Sulfate Blida City Algeria