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A hybrid PSS–SSSC GA-stabilization scheme for damping power system small signal oscillations

Mohammad Ghanbari Jolfaei, Adel M. Sharaf, Seyed Mohammad Shariatmadar, Mohammad Bayati Poudeh
2016 International Journal of Electrical Power & Energy Systems  
Nonlinear and fast quasi dynamic type loads of different time-varying ranges are introduced to the electric grid systems due to renewable Energy, distributed Generation and Power electronic AC-DC-AC interface converters used in several parts of the power network, the dynamic small signal electromechanical modes are destabilized and dynamic stability limits of AC system is reduced. FACTS -Flexible AC Transmission Devices with conventional coordinated power system Stabilizers are utilized to
more » ... ve dynamic stability margins and damp unstable and oscillatory electromechanical modes of oscillations. Coordinated Flexible Soft Computing Control Strategies are proposed for damping modes of through supplementary damping torques provided by Static Synchronous Series Compensator -SSSC in addition to classical Power System stabilizers -PSS. To coordinate the dual action of both SSSC and PSS devices a Genetic algorithm Tuning Controller is applied. The dynamic simulation results for optimized controllers are validated using Matlab/Simulink Software Environment.
doi:10.1016/j.ijepes.2015.08.024 fatcat:6fbm6vkskzemjblv6kpahaxum4

Towards Effective Customer Relationship Management In Oman: Role Of Big Data

Tarek Khalil, Mohammad Al-Refai, Amer Nizar Fayez, Mohammed Sharaf Qudah
2017 Zenodo  
We established a framework to explore the feasibility of enabling big data within the customer relationship management (CRM) strategies in Oman for creating sustainable business profit nationwide. A qualitative evaluation was made based on predictive analytics convergence and big data facilitated CRM. It was found that the big data analytics can meticulously alter the competitive industrial setting, and thereby proffered notable benefits to the business organization in terms of operation,
more » ... gies, and competitiveness. Results revealed that companies must introduce analytical tools, real-time data, and hire talented as well as skilled employees to improve the productivity in consistent with the new business model. Furthermore, depending on the customer engagement, an assemblage and analysis of enormous data volume together with analytical tools was discerned to assist companies towards efficient resource allocation and capital spending. The implications of using big data for CRM in Oman and way forward were emphasized.
doi:10.5281/zenodo.1039627 fatcat:bd4d2bzikjavtiodukzlwtr6h4

Prescription Errors and Pharmacist Intervention at Outpatient Pharmacy of Prince Zaid Bin Al Hussien Hospital (RMS), Jordan

Yara Abo Taleb, Samer Abdel Jaleel, Mohammad Safi, Sharaf Saeed, Mohammad Al Bdairat
2019 Zenodo  
Taleb, Samer Abdel Jaleel, Mohammad Safi, Sharaf Saeed, and Mohammad Al Bdairat, "Prescription Errors and Pharmacist Intervention at Outpatient Pharmacy of Prince Zaid Bin Al Hussien Hospital (RMS), Jordan  ... 
doi:10.5281/zenodo.3238406 fatcat:ycxkpxd745dizo7nk5oztqsfz4

Neurocognitive functions and educational outcomes in children with chronic renal disease

Sawsan Elmoselhy, Reham Elhossiny, Mohammad Sharaf, Hossam Sakr, Mena Youssef, Noha Mohammed
2020 GEGET  
Chronic kidney disease (CKD) in children is a major global health problem. They are at risk for developing cognitive functions impairment more than adults due to the development of CKD during crucial stages of brain development. Aim of the study: To assess the neurocognitive status and educational outcomes in children with CKD stages 2-5. Methods: A cross sectional study was conducted on 75 patients with CKD, & 25 controls. Neurocognitive status was assessed using WIQ (Wechsler Intelligent
more » ... ent), Benton Visual Retention Test (BVRT), computerized Wisconsin Card Sorting Test (WCST) and structural MRI Brain. Results: Children with CKD had significantly lower total, verbal, performance IQ and a disability at visual memory and attention denoted by worse performance at BVRT compared to the healthy controls. Scores of CKD patients at WCST were worse than the control, thus denoting a disability at brain executive functions. For MRI, white matter lesions were reported in 2 patients on regular hemodialysis. Conclusions: Children with CKD may have average to low-average cognition compared with the general population, with significant deficits at educational outcomes, visual memory, attention, & executive function. Limitations: We could not assess the longitudinal change in cognitive functions with advancing CKD, as the study was a cross sectional one with relatively small sample size. Implication of Practice: This study highlighted the importance of implementing changes in the routine care of children with CKD encouraging better nutrition and educational programs.
doi:10.21608/geget.2021.45229.1015 fatcat:pqjqtlmbqnbcrpmzablwfbtiba

Intelligent Anti-Theft and Tracking System for Automobiles

Montaser N. Ramadan, Mohammad A. Al-Khedher, Sharaf A. Al-Kheder
2012 International Journal of Machine Learning and Computing  
Ramadan, Mohammad A. Al-Khedher, Senior Member, IACSIT, and Sharaf A. Al-Kheder International Journal of MachineLearning and Computing, Vol. 2, No. 1, February 2012  ...  Sharaf A. Al-kheder is with the Department Of Civil Engineering, Faculty Of Engineering & Applied Sciences, ALHOSN University, Abu Dhabi, UAE (emails: s.alkheder@alhosnu.ae). N.  ... 
doi:10.7763/ijmlc.2012.v2.94 fatcat:d26h3zg6vzbq3oakqpe6ulteym

DELINEATING THE EFFECT OF EDUCATORS' AFFECTION ON STUDENTS' LEARNING

Dr. Mohammad Reza Sharaf, Sareh Yadegari,
2017 Researchers World – Journal of Arts Science & Commerce  
This essay with the focus on education in Islam using the descriptive and analytical method aims to delineate the effect of educators' affection on students' learning. In Merriam Webster, learning is defined as knowledge or skill acquired by instruction or study while affection as a moderate feeling or emotion. The main concern of this study is to maintain the relationship between teachers' affection and students' learning while considering its effects, its extent, and the right time of using
more » ... . This essay tries to answer these questions by providing evidences mainly from the Islamic point of view on education. The most important results of this study show that affection is considered as part of magnetism of a teacher which contributes greatly to the teacher's effectiveness and teaching quality as well as the students' learning and engagement. Teacher's affection can extremely affects the students' learning experiences and is an essential element in education; nevertheless, in Islam, every action practiced without moderation can present considerable drawbacks to those affected. Thus, the emotional domain plays a prominent role and affects the cognition to a great extent. Affection based instruction encourages the learners to participate dynamically and to cooperate eagerly in the learning experiences. Therefore, its importance is maintained prior to and along the entire process of learning.
doi:10.18843/rwjasc/v8i3(1)/14 fatcat:jc7hjyzxgbhjbmw7jw72f2afhe

A Preliminary Study on Architecting Cyber-Physical Systems

Ivano Malavolta, Henry Muccini, Mohammad Sharaf
2015 Proceedings of the 2015 European Conference on Software Architecture Workshops - ECSAW '15  
Cyber-physical systems (CPSs) are deemed as the key enablers of next generation applications. Needless to say, the design, verification and validation of cyber-physical systems reaches unprecedented levels of complexity, specially due to their sensibility to safety issues. Under this perspective, leveraging architectural descriptions to reason on a CPS seems to be the obvious way to manage its inherent complexity. A body of knowledge on architecting CPSs has been proposed in the past years.
more » ... l, the trends of research on architecting CPS is unclear. In order to shade some light on the state-of-the art in architecting CPS, this paper presents a preliminary study on the challenges, goals, and solutions reported so far in architecting CPSs.
doi:10.1145/2797433.2797453 dblp:conf/ecsa/MalavoltaMS15 fatcat:a2vcpe4ap5an7eznia5obgbluu

Predictive Value of Platelet Aggregation Responses and Coagulation Parameters for Thromboembolic Risk in Children with Idiopathic Nephrotic Syndrome

Mohammad Sharaf, Soha Abuelela
2020 GEGET  
Idiopathic nephrotic syndrome (INS) is the most common renal disease among children. INS present with proteinuria, hyperlipidemia, edema, hypoalbuminemia, and hypercoagulability. A serious consequence of INS is arterial and/or venous thromboembolism e.g., deep vein thrombosis (DVT), pulmonary emboli and renal vein thrombosis. This hypercoagulability may be due to urinary loss of small proteins, specifically antithrombin (AT) III, protein C and S. INS children have been observed to develop
more » ... ocytosis and platelet hyper aggregation leading to increased thromboembolic risk. Aim of the Study: To evaluate the coagulation profile and results of platelet functions during active nephrosis in children with steroid sensitive and steroid resistant INS. Methods: Thirty-six children with INS were studied. Twenty-four steroid sensitive and 12 steroid resistant patients were evaluated for platelet function and coagulation parameters during active nephrosis (either at presentation or relapse). The study also included 15 healthy age and sex matched children as control. Doppler imaging was done to confirm thromboembolic events. Results: Thrombo-embolic complications were observed in 14/36 patients, diagnosed both clinically and/or by doppler. Prolonged PTT was observed during active nephrosis, compared to control. Hypoalbuminemia and hyperlipidemia contributed to hypercoagulability. Mean platelet aggregation to ADP and Ristocetin were significantly elevated among both groups (108.3±10.8% and 104.8±13.2% respectively). Levels of ATIII were significantly reduced, further adds to thrombotic risk. Conclusion: Thromboembolic complications are not uncommon in nephrotic children. Platelet hyperaggregability positively correlated with VTE in INS children and can be a beneficial predictor of thrombosis during active nephrosis especially those past history of VTE.
doi:10.21608/geget.2021.41437.1014 fatcat:6zoqx24uujbgnp22p3npgbs6sm

Embedded two level direct adaptive fuzzy controller for DC motor speed control

Ahmad M. Zaki, Mohammad El-Bardini, F.A.S. Soliman, Mohammed Mabrouk Sharaf
2018 Ain Shams Engineering Journal  
This paper presents a proposed approach based on an adaptive fuzzy logic controller for precise control of the DC motor speed. In this concern, the proposed Direct Adaptive Fuzzy Logic Controller (DAFLC) is estimated from two levels, where the lower level uses a Mamdani fuzzy controller and the upper level is an inverse model based on a Takagi-Sugeno (T-S) method in which its output is used to adapt the parameters of the fuzzy controller in the lower level. The proposed controller is
more » ... using an Arduino DUE kit. From the practical results, it is proved that the proposed adaptive controller improves, successfully both the performance response and the disturbance due to the load in the speed control of the DC motor.
doi:10.1016/j.asej.2015.10.003 fatcat:oq4vtkzbezendpgt4nvc5to35a

A Voltage Multiplier Circuit Based Quadratic Boost Converter for Energy Storage Application

Javed Ahmad, Mohammad Zaid, Adil Sarwar, Chang-Hua Lin, Shafiq Ahmad, Mohamed Sharaf, Mazen Zaindin, Muhammad Firdausi
2020 Applied Sciences  
(Mohammad Zaid), A.S. and C.-H.L.; Writing-original draft, J.A., M.Z. (Mohammad Zaid) and A.S.; Writing-review and editing, S.A., M.S., M.Z. (Mazen Zaindin) and M.F.  ...  (Mohammad Zaid) and A.S.; Formal analysis, J.A., M.Z. (Mohammad Zaid) and A.S.; Funding acquisition, S.A., M.S., M.Z. (Mazen Zaindin) and M.F.; Investigation, J.A., M.Z.  ... 
doi:10.3390/app10228254 fatcat:rkmnusujsfemrjedqk2dei6o5a

A Cohort Study of Acute Kidney Injury in Egyptian Neonates; Etiology, Risk Factors, Diagnosis and Three Months Follow Up

Mohammad Sharaf, Wafaa Ahmed
2021 GEGET  
Acute kidney injury (AKI) is a major contributor of neonatal mortality and morbidity. Understanding the different anatomy of the neonatal kidney could help physician understand pathology of AKI and consequently could treat it efficiently. Aim of the study: This one year duration prospective Cohort study involved twenty seven admitted neonates who had acute kidney injury (AKI). Methods: Laboratory and radiologic diagnosis of AKI, further AKIN and pRIFLE classification and follow up after one and
more » ... three months. Results: AKI had an incidence of 1.35%, mainly in full-term (59%). Hypertension was presented in fullterm (75%) and preterm (45.5%). Hematuria presented by 18.8% (full-term) and 27.3% (preterm). Proteinuria occurred in full-term (46.7%) and preterm (36.4%). Urinary tract infection was more among (45.5%) preterm than full term (25%). Oliguric AKI was found in full term (68.8%) and preterm (72.7%). Anuric AKI present in full-term (31.1%) and preterm (9.1%). Post renal AKI were present 18.8 %( full term) and 9.1 %( preterm). Perinatal asphyxia (18.8%) and sepsis (27.3%) were the most common risk factor. Both full-term (37.5%) and preterm (18.2%) needed peritoneal dialysis. Ultrasonography showed bilateral Grade 2 (50%) and 1(25%) nephropathy and bilateral back pressure (18%). pRIFLE was inversely correlate with age and urine output and positively correlated with hypertension at baseline. At one month; 43.8% full-term, 18.2 % preterm were found hypertensive, 18.8% fullterm had proteinuria, pRIFLE was inversely correlated with urine output and proteinuria and eCCL was significantly improved after one month in both preterm and full-term. At three month, chronic kidney disease was 12.5% and 9.1% in full-term and preterm respectively. Total recovery was higher in preterm neonates than in fullterm ones. Conclusion: Sepsis and asphyxia are considered the most common causes of AKI. Limitation: A longer follow up is mandatory. Further follow up studies of AKI in preterm neonates are mandatory.
doi:10.21608/geget.2021.187043 fatcat:vwitf6ttrjb7bi3j6laax2wani

Assessment knowledge and practice of mothers having children with chronic kidney disease

Amany Ibrahim Abdalla, Sabah Saad Al-Sharkawy, Hyam Refaat Tantawy, Mohammad Abdelmonaem Sharaf
2020 Egyptian Journal of Health Care  
Chronic kidney disease (CKD) refers to irreversible kidney damage that can further progress to end-stage renal disease (ESRD). This study aimed to assess knowledge and practice of mothers having children with chronic kidney disease. Subjects and methods; Research design: Descriptive design was done, Sample: A convenient sample included 55 children with chronic kidney disease from both sex and their mothers, Setting: The study was conducted Children's Hospital affiliated to Ain Shams University
more » ... ospitals. Tools of data collection: Questionnaire sheet and observation checklist. The results of this study revealed that mother's knowledge and practice regarding care of their children with chronic kidney disease was unsatisfactory. In conclusion: It was concluded that about three quarters of the studied mothers have unsatisfactory knowledge and practice regarding care of their children with chronic kidney disease. The study recommendations: Encourage training courses for mothers regarding care of their children with chronic kidney disease.
doi:10.21608/ejhc.2020.126417 fatcat:c4en6ukhrfa2fj3cqatl3rau7q

Implications of Foot Ulceration in Hemodialysis Patients: A 5-Year Observational Study

Hassan Al-Thani, Ayman El-Menyar, Valsa Koshy, Ahmed Hussein, Ahmed Sharaf, Mohammad Asim, Ahmed Sadek
2014 Journal of Diabetes Research  
Foot ulceration (FU) remains a serious concern for patients worldwide. We analyzed the incidence, risk factors, and outcome of FU in hemodialysis (HD) patients. A retrospective cohort study was conducted for 252 HD patients who were followed up for 5 years. Patients were categorized according to whether they developed FU or not. The FU group (17%) was older and had significantly higher incidence of nephropathy, retinopathy, peripheral (PAD), coronary artery disease (CAD), and diabetes mellitus
more » ... DM) as compared to no-FU group. FU group had higher frequency of major amputation (P=0.001) and HD vascular access (P=0.01). Patients with combined DM and PAD had a 10-fold increased risk of FU in comparison to those who had DM alone. Presence of PAD was the main independent predictor for development of FU in HD with an adjusted odd ratio (aOR) of 16.0 (95% CI: 4.41–62.18;P=0.001). After adjusting for age, sex, and CAD, predictors for mortality were PAD (aOR 4.3), FU (aOR 3.6), and DM (aOR 2.6). FU is common in HD patients regardless of DM. However, the presence of PAD is significantly associated with more FU and mortality in HD. HD patients need intensive foot care and warrant progressive modification of vascular risk factors.
doi:10.1155/2014/945075 pmid:24724108 pmcid:PMC3958654 fatcat:wfukhnv5cjb23lsbows363exaq

Hepatosplenic Gamma Delta T-cell Lymphoma Presenting as Progressive Hepatosplenomegaly Highlighted during Pregnancy

Almasri Hussam, Petkar Mahir, Zafar Abdulaziz, Abuwahed Mohammed, Altermanini Mohammad, Ahmad Rita, Eldean Mouhammad Sharaf
2020 International Journal of Oncology Research  
Hepatosplenic T-cell lymphoma (HSGDTL) is a rare variant of T-cell lymphoma with few reported cases in literature. It usually presents with hepatosplenomegaly and constitutional symptoms, primarily in young to middle aged patients. The prognosis is generally poor, with maximum reported survival periods of 2-3 years. There is a link to immunodeficiency and some biological treatments. Liver biopsy with flow cytometry is required to confirm the diagnosis. We report a case of gamma delta (γδ) HSTCL
more » ... in a 37-yearold female presenting as progressive hepatosplenomegaly with cytopenia during pregnancy. The patient underwent chemotherapy, splenectomy and bone marrow transplant and is in remission 10 months after the diagnosis. As far as we are aware, this is the first case of γδ HSGDTL reported in the Middle East and the second documented case of HSGDTL that highlighted during pregnancy.
doi:10.23937/2643-4563/1710024 fatcat:f63kqz3hvngmtdtdnwy4rbydxq

A Summary of the SARS-CoV-2 Vaccines and Technologies Available or under Development

Zainalabideen A. Abdulla, Sharaf M. Al-Bashir, Noor S. Al-Salih, Ala A. Aldamen, Mohammad Z. Abdulazeez
2021 Pathogens  
Since the beginning of 2020, the world has been in a race to develop vaccines that can control the COVID-19 pandemic. More than 250 projects have been initiated for this purpose, but only 14 of them have been authorized for use, despite being in phase 3 clinical trials. More than 40 other vaccines are also in phase 1/2 clinical trials and show promising outcomes. Regarding the appropriate choice of vaccines for each country or region, we reviewed the currently used vaccines in light of the
more » ... rent influencing parameters. These factors include the mode of action, dosage protocol, age group of the vaccinee, side effects, storage conditions, mounted immune response, and cost. Technically, there are seven types of vaccines developed against SARS-CoV-2: messenger RNA (mRNA), nonreplicating and replicating vectors, inactivated viruses, protein subunits, viral-like particles, DNA vaccines, and live attenuated vaccines. The mRNA type is being used for the first time in humans. Unfortunately, mutated variants of SARS-CoV-2 have started to appear worldwide, and researchers are investigating the effects of the currently used vaccines on them. There are many concerns regarding the long-term protection afforded by these vaccines and their side effects, and whether they require future modifications to be effective against the mutated variants. The development of new vaccines using more advanced technology is paramount for overcoming the difficulties in controlling the COVID-19 pandemic across the world.
doi:10.3390/pathogens10070788 fatcat:ywrmdujxofdqzdlkmkcvnxcclq
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