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Performance Analysis of the Reconfigurable intelligent Surfaces Communication Systems

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Journal of Communications and information Networks 2024年第2期9卷 184-191页

作者： omar Abu Ella Department of Electrical and Electronic Engineering Misurata University2659 Zawiat AlmahjoubMisurataLibya

Reconfigurable intelligent surfaces (RiS) play a vital role in meeting the growing demand for higher data rates and reliability in wireless systems. This study focuses on analyzing the performance of RiS systems to gain a deeper understanding of their *** paper presents a mathematical analysis of the RiS system,deriving closed-form formulae that express its characteristics including signal-to-noise ratio(SNR)distribution,ergodic and effective capacity,outage,and error probability. The obtained formulae are newly derived and unconditionally valid solutions. Numerical results demonstrate a close agreement between the derived formulae and MonteCarlo simulation outcomes.

关键词： ergodic capacity effective capacity outage probability bit error rate Rayleigh fading channel RiSassisted communication system

Critical assessment of R410A alternatives for mini-split air conditioners in the Egyptian market

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Energy and Built Environment 2024年第3期5卷 426-445页

作者： omar M.Zaki omar Abdelaziz Mechanical Power Engineering Department Faculty of EngineeringCairo UniversityGiza 12613Egypt Department of Mechanical Engineering The American University in CairoAUC AvenueNew Cairo 11835Egypt

in this study,the potential implementation of three different low-GWP refrigerants(R32,R452B,and R454B)as replacements for R410A was *** study was performed using a simulation tool developed by the authors called RACHP-Lab,which is a vapor compression system simulation tool developed based on physics-based simulation for typical mini-split air *** simulation study was carried out and validated using experimental performance data of 10 different air conditioning units available in the Egyptian *** units included fixed-speed or variable-speed compressors and operated in cooling or heating ***-in replace-ment with the new refrigerants was carried *** R32,the capacity increased between 4.9%and 13%for cooling cases,and 6.3%and 12.4%for heating ***,COP did not improve in all *** R452B and R454B with direct replacement,the capacity nearly remained the same,with an increase of COP between 1.6%and 8.0%.Soft optimization was also conducted on cooling cases where compressor suction superheat,condenser subcooling,and compressor volumetric speed were optimized to maximize COP while maintaining the original capacity of R410A.R32 showed an improvement of COP over R410A between 4.6%and 15.5%,while for R452B and R454B between 2.2%and 13.2%.

关键词： Air conditioner Heat pump Alternative refrigerants Vapor compression cycle modeling

Effect of Hepatitis C Treatment on Renal Function in Liver Transplant Patients

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Journal of Clinical and Translational Hepatology 2018年第4期6卷 391-395页

作者： Mohamed Shoreibah John Romano Ornar T.Sims Yuqi Guo DeAnn Jones Krishna Venkata Vishnu Kommineni Jordan Orr Paul Fitzmorris omar i.massoud Division of Gastroenterology&Hepatology School of MedicineUniversity of Alabama at BirminghamBirminghamALUSA Department of internal Medicine School of MedicineUniversity of Alabama at BirminghamBirminghamALUSA Department of Social Work College of Arts and SciencesUniversity of Alabama at BirminghamBirminghamALUSA Department of Health Behavior School of Public HealthUniversity of Alabama at BirminghamBirminghamALUSA Center for AiDS Research School of MedicineUniversity of Alabama at BirminghamBirminghamALUSA School of Social Work University of AlabamaTuscaloosaALUSA Department of Pharmacology University of Alabama at BirminghamBirminghamALUSA Division of Gastroenterology and Hepatology Department of MedicineVanderbilt UniversityNashvilleTNUSA

Background andAims:Hepatitis C Virus(HCV)is uniformly recurrent after liver transplant(LT)and recurrence is associated with an increased risk of *** medications increase the risk of chronic kidney disease,and the presence of chronic kidney disease presents a challenge for HCV treatment in LT *** aim of this study was to assess changes in glomerular filtration rates(GFRs)of LT recipients receiving HCV ***:This is a retrospective study of LT patients who received HCV treatment between 2015 and 2016(n=60).The outcomes of interest were differences in serum creatinine levels and in GFR,measured at treatment initiation and at 24 weeks after *** average age of the patients was 59 years-old,and 17%were cirrhotic and 67%were *** patients received sofosbuvir/ledipasvir without ***:All patients achieved sustained virologic response at 12 weeks after treatment(SVR12).At baseline,55%of patients had GFRin per 1.73 *** those patients,GFR did not change in 18%,33%had improved GFR,and 48%had worsened *** to 45%of the patients had a GFR>60 mL/min per 1.73 *** those patients,GFR did not change in 81%,and 19%had worsened *** the entire cohort,65%of patients had improved or stable GFR and 35%had worsened *** average change in serum creatinine between baseline and 24 weeks was 0.10(p=0.18).Conclusions:This study showed improved or unchanged GFR in 65%and worsened GFR in 35%of LT recipients who achieved *** of GFR was more frequently encountered in those with impaired renal function at *** should be used when treating HCV in LT recipients,especially those with baseline status of renal impairment.

关键词： Hepatitis C Renal function Direct-acting antivirals Liver transplant Treatment

Genotype-based precision nutrition strategies for the prediction and clinical management of type 2 diabetes mellitus

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World Journal of Diabetes 2024年第2期15卷 142-153页

作者： omar Ramos-Lopez Medicine and Psychology School Autonomous University of Baja CaliforniaTijuana 22390Baja CaliforniaMexico

Globally,type 2 diabetes mellitus(T2DM)is one of the most common metabolic disorders.T2DM physiopathology is influenced by complex interrelationships between genetic,metabolic and lifestyle factors(including diet),which differ between populations and geographic *** fact,excessive consumptions of high fat/high sugar foods generally increase the risk of developing T2DM,whereas habitual intakes of plant-based healthy diets usually exert a protective ***,genomic studies have allowed the characterization of sequence DNA variants across the human genome,some of which may affect gene expression and protein functions relevant for glucose *** comprehensive literature review covers the impact of gene-diet interactions on T2DM susceptibility and disease progression,some of which have demonstrated a value as biomarkers of personal responses to certain nutritional ***,novel genotype-based dietary strategies have been developed for improving T2DM control in comparison to general lifestyle ***,progresses in other omics areas(epigenomics,metagenomics,proteomics,and metabolomics)are improving current understanding of genetic insights in T2DM clinical *** more investigation is still needed,the analysis of the genetic make-up may help to decipher new paradigms in the pathophysiology of T2DM as well as offer further opportunities to personalize the screening,prevention,diagnosis,management,and prognosis of T2DM through precision nutrition.

关键词： Type 2 diabetes mellitus Nutrigenetics Single nucleotide polymorphism Genotype Diet Precision nutrition

Burden of routine orthopedic implant removal a single center retrospective study

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World Journal of Orthopedics 2024年第2期15卷 139-146页

作者： Ammar K AlOmran Nader Alosaimi Ahmed A Alshaikhi omar M Bakhurji Khalid J Alzahrani Basil Ziyad Salloot Tamim omar Alabduladhem Ahmed i AlMulhim Arwa Alumran Department of Orthopedic College of MedicineImam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia Health information Management and Technology Department Imam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia

BACKGROUND Open reduction and internal fixation represent prevalent orthopedic procedures,sparking ongoing discourse over whether to retain or remove asymptomatic *** consensus on this matter is paramount for orthopedic *** study aims to quantify the impact of routine implant removal on patients and healthcare facilities.A retrospective analysis of implant removal cases from 2016 to 2022 at King Fahad Hospital of the University(KFHU)was conducted and subjected to statistical *** these cases,44%necessitated hospitalization exceeding one day,while 56%required only a single *** exhibited a 55%need for extended hospital stays,contrasting with 22.8%among the pediatric *** complication rate was 6%,with all patients experiencing at least one ***,34.1%required sick leave and 4.8%exceeded 14 *** anesthesia was predominant(88%).Routine implant removal introduces unwarranted complications,particularly in adults,potentially prolonging *** procedure strains hospital resources,tying up the operating room that could otherwise accommodate critical *** defined institutional guidelines are imperative to regulate this *** To measure the burden of routine implant removal on the patients and *** This is a retrospective analysis study of 167 routine implant removal cases treated at KFHU,a tertiary hospital in Saudi *** were collected in the orthopedic department at KFHU from February 2016 to August 2022,which includes routine asymptomatic implant removal cases across all age *** indications such as infection,pain,implant failure,malunion,nonunion,restricted range of motion,and prominent hardware were *** who had external fixators removed or joints replaced were also *** Between February 2016 and August 2022,360 implants were retrieved;however,only 167 of those who met the inclusion criteria were included in this

关键词： implant removal Healed fracture Orthopedic implant Complications Healthcare system

Advanced Optimized Anomaly Detection System for ioT Cyberattacks Using Artificial intelligence

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Computers, Materials & Continua 2024年第2期78卷 1525-1545页

作者： Ali Hamid Farea omar H.Alhazmi Kerem Kucuk Department of Computer Science Taibah UniversityMedina42315Saudi Arabia Department of Software Engineering Kocaeli UniversityKocaeli41001Turkey

While emerging technologies such as the internet of Things(ioT)have many benefits,they also pose considerable security challenges that require innovative solutions,including those based on artificial intelligence(Ai),given that these techniques are increasingly being used by malicious actors to compromise ioT *** an ample body of research focusing on conventional Ai methods exists,there is a paucity of studies related to advanced statistical and optimization approaches aimed at enhancing security *** contribute to this nascent research stream,a novel Ai-driven security system denoted as“Ai2Ai”is presented in this ***2Ai employs Ai techniques to enhance the performance and optimize security mechanisms within the ioT *** also introduce the Genetic Algorithm Anomaly Detection and Prevention Deep Neural Networks(GAADPSDNN)sys-tem that can be implemented to effectively identify,detect,and prevent cyberattacks targeting ioT ***,this system demonstrates adaptability to both federated and centralized learning environments,accommodating a wide array of ioT *** evaluation of the GAADPSDNN system using the recently complied WUSTL-iioT and Edge-iioT datasets underscores its *** an impressive overall accuracy of 98.18%on the Edge-iioT dataset,the GAADPSDNN outperforms the standard deep neural network(DNN)classifier with 94.11%***,with the proposed enhancements,the accuracy of the unoptimized random forest classifier(80.89%)is improved to 93.51%,while the overall accuracy(98.18%)surpasses the results(93.91%,94.67%,94.94%,and 94.96%)achieved when alternative systems based on diverse optimization techniques and the same dataset are *** proposed optimization techniques increase the effectiveness of the anomaly detection system by efficiently achieving high accuracy and reducing the computational load on ioT devices through the adaptive selection of active features.

关键词： internet of Things security anomaly detection and prevention system artificial intelligence optimization techniques

Rare earth based MgPm_(2)X_(4)(X=S,Se) spinel chalcogenides for spintronic and thermoelectric applications

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Journal of Rare Earths 2024年第8期42卷 1577-1585,I0006页

作者： Tariq M.Al-Daraghmeh omar Zayed Ghulam M.Mustafa Taharh Zelai Bisma Younas Hind Albalawi S.Bouzgarrou Othman Hakami Q.Mahmood Khaild i.Hussein Basic Sciences Department King Abdullah II School of EngineeringPrincess Sumaya University For TechnologyPO.Box 1438Al-jubaiha11941AmmanJordan Department of Physics Division of Science&TechnologyUniversity of EducationLahorePakistan Department of Physics Faculty of ScienceJazan University JazanSaudi Arabia Department of Physics The University of LahoreLahorePakistan Department of Physics College of SciencesPrincess Nourah bint Abdulrahman University(PNU)PO.Box 84428Riyadh11671Saudi Arabia Department of Physics College of ScienceQassim UniversityPo.64BuraidahSaudi Arabia Laboratoire de Microelectronique et instrumentation(UR 03/13-04)Faculte des Sciences de Monastir Avenue de I'Environnement 5000MonastirTunisia Department of Chemistry Faculty of ScienceJazan University JazanSaudi Arabia Basic&Applied Scientifc Research Center Department of PhysicsCollege of ScienceImam Abdulrahman Bin Faisal UniversityPO.Box 1982Dammam 31441Saudi Arabia Department of Radiological Sciences College of Applied Medical SciencesKing Khalid UniversityAbha61421Saudi Arabia

in current report,the structural,magnetic,and thermoelectric properties of RE doped MgPm_(2)X_(4)(X=S,Se) spinels were *** energy difference in ferromagnetic and antiferromagnetic states reveals the stability of MgPm_(2)(S/Se)_(4) in the ferromagnetic *** co mputation of enthalpy of formation also ascertains thermodynamic stability of crystal ***-dependent band structure and density of states analysis reveal ferromagnetic semiconducting character showing different electronic behavior in both spin *** room temperature ferromagnetism,spin polarization and Curie temperature are estimated from exchange energies *** addition,exchange constants(N_(0)α and N_(0)β),exchange energy Δ_(x)(pd),crystal ifeld energy,and double exchange mechanism were studied to explore the magnetic ***,the electrical conductivity,thermal conductivity,Seebeck co-efficient,and power factor show effect on electrons spin and their potential for thermoelectric devices.

关键词： Rare earth elements Spintronic applications Thermoelectric effects Exchange energies

Evaluation of hand infections in the emergency department using point-of-care ultrasound

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World Journal of Emergency Medicine 2024年第4期15卷 283-288页

作者： David Ahmad Haidar David Mintz Brandon M Wubben omar Rizvi Srikar Adhikari Department of Emergency Medicine Michigan MedicineAnn Arbor 48109-1382USA University of Arizona College of Medicine Tucson 85724USA Department of Emergency Medicine University of IowaIowa City 52242-1009USA Department of Surgery University of Arizona College of MedicineTucson 85724USA Department of Emergency Medicine University of Arizona College of MedicineTucson 85724USA

BACKGROUND:We aimed to evaluate the utility of point-of-care ultrasound(POCUS)in the assessment of hand infections that present to the emergency department(ED)and its impact on medical decision making and patient ***:We conducted a retrospective review of patients who presented to two urban academic EDs with clinical presentations concerning for skin and soft tissue infections(SSTi)of the hand between December 2015 and December *** trained POCUS fellowship physicians reviewed an ED POCUS database for POCUS examinations of the *** then reviewed patients’electronic health records(EHR)for demographic characteristics,history,physical examination findings,ED course,additional imaging studies,consultations,impact of POCUS on patient care and final ***:We included a total of 50 cases(28 male,22 female)in the final *** most common presenting symptoms and exam findings were pain(100%),swelling(90%),and erythema(74%).The most common sonographic findings were edema(76%),soft tissue swelling(78%),and fluid surrounding the tendon(57%).POCUS was used in medical decision making 68%of the time(n=34),with the use of POCUS leading to changes in management 38%of the time(n=19).POCUS use led to early antibiotic use(11/19),early consultation(10/19),and led to the performance of a required procedure(8/19).The POCUS diagnosis was consistent with the discharge diagnosis of flexor tenosynovitis 8/12 times,abscess 12/16 times,and cellulitis 14/20 ***:POCUS is beneficial for evaluating of hand infections that present to the ED and can be used as an important part of medical decision making to expedite patient care.

关键词： Ultrasound Point-of-care ultrasound Cellulitis Abscess Flexor tenosynovitis

ipsilateral fractures of the acromion and coracoid processes of the scapula

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Chinese Journal of Traumatology 2024年第2期27卷 121-124页

作者： Yusuf omar Qalib Srinivasa Reddy Medagam Sunil Dachepalli Department of Orthopaedics The Fifth Affiliated Hospital of Sun Yat-Sen UniversityZhuhai519000GuangdongChina Department of Orthopaedics Yashoda HospitalsSomajigudaHyderabadTelangana500082India

A fracture of the acromion and coracoid processes of scapula is rarely seen in the outpatient clinic,due to the acromion's anatomical position and shape,as well as the strong ligaments and muscles that are attached to *** fractures are caused by either direct or indirect high-energy trauma injuries to the shoulder joint,leading to severe pain and a grossly restricted range of *** acromial classifications were reported,but this type of longitudinal plane fracture of the acromion process in our case is yet to be described in the current *** present a rare combination of the coracoid process and unstable acromion bony projection fractures that have not previously been noted for this type of *** closest to this is Kuhn's type iii classification.A 51-year-old male presented to our emergency department complaining of the right shoulder pain and difficulty raising his arm following a 2-wheeler *** patient was managed by open reduction and internal fixation with 3 cannulated cancellous screws fixation and progressed well with no postoperative *** was asymptomatic postoperatively and regained full range of motion after 4 months.

关键词： Acromion Scapular fracture Coracoid process