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Journal of Information and Intelligence 2023年第3期1卷 238-252页

作者： Marco Di Renzo abdelhamed mohamed Alessio Zappone Gabriele Gradoni Marco Rossi Massimo Moccia Giuseppe Castaldi Vincenzo Galdi Universite Paris-Saclay CNRSCentraleSupelecLaboratoire des Signaux et Systemes3 Rue Joliot-CurieGif-sur-Yvette 91192France University of Cassino and Lazio Meridionale Department of Electrical and Information EngineeringVia Gaetano Di Biasio 43Cassino(FR)03043Italy University of Nottingham School of Mathematical Sciences and Department of Electrical and Electronics EngineeringUniversity ParkNottingham NG72RDUK dUniversity of Cambridge Department of Computer Science and Technology15 J.J.Thomson AvenueCambridge CB30FDUK University of Sannio Department of EngineeringCorso Garibaldi 107Benevento 82100Italy

Reconfigurable intelligent surfaces(RISs)are a promising technology for wireless communication applications,but their performance is often optimized using simplified electromagnetic reradiation *** this study,we explore the impact on the RIS performance of more realistic assumptions,including the(possibly imperfect)quantization of the reflection coefficients,subwavelength inter-element spacing,near-field location,and presence of electromagnetic *** find that design constraints can cause an RIS to reradiate power in unwanted ***,it is important to optimize an RIS by considering the entire reradiation ***,our study indicates that a 2-bit digitally controllable RIS with a nearly constant reflection amplitude and RIS elements with a size and inter-element spacing between(1/8)th and(1/4)th of the signal wavelength may offer a reasonable tradeoff between performance,complexity,and cost.

关键词： Wireless communications Reconfigurable intelligent surfaces Dynamic metasurfaces Modeling Performance evaluation Optimization

Hepatocellular carcinoma recurrence:Predictors and management

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Liver Research 2023年第4期7卷 321-332页

作者： Walaa abdelhamed mohamed El-Kassas Endemic Medicine Department Sohag UniversitySohagEgypt Endemic Medicine Department Faculty of MedicineHelwan UniversityCairoEgypt

Hepatocellular carcinoma(HCC),the sixth most common cancer globally,is associated with high mortality rates and more than 830,000 annual *** advances in the available management options including surgical resection and local ablative therapies,recurrence rates after the initial treatment exceed 50%,even among patients who have undergone curative-intent ***,postsurgical HCC recurrence occurs in about 70%of cases five years *** management of recurrent HCC remains *** review discusses different predictors for HCC recurrence after each treatment modality and different approaches available to stratify these *** specific guidelines for managing HCC recurrence and strict surveillance protocols for such recurrence after initial HCC management are needed.

关键词： Hepatocellular carcinoma(HCC) Recurrence Ablation Liver resection Liver transplantation

Fibrolamellar hepatocellular carcinoma:A rare but unpleasant event

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World Journal of Gastrointestinal Oncology 2022年第6期14卷 1103-1114页

作者： Walaa abdelhamed mohamed El-Kassas Department of Endemic Medicine Sohag UniversitySohag 14322Egypt Department of Endemic Medicine Faculty of MedicineHelwan UniversityCairo 11795Egypt

Fibrolamellar carcinoma(FLC)is a rare variant of hepatocellular carcinoma(HCC),comprising 1%–9%of all *** is a poorly understood malignancy,which seems to be more prevalent in young patients with no underlying liver *** term“fibrolamellar”is derived from thick fibrous collagen bands surrounding the tumor *** HCC,cirrhosis and viral hepatitis infection are not predisposing to FLC,and it is not associated with elevations in serum *** patients often present with vague abdominal pain,nausea,malaise,and weight *** cases present are at an advanced stage at the time of initial ***,curative treatment options can still be offered to up to 70%of ***(resection/liver transplantation)is the mainstay of treatment and the only potentially curative *** have been less chemoresponsive than the conventional HCC,however,in advanced cases,multimodality treatments can be *** advances in molecular studies of FLC have found a unique DNAJB1–PRKACA fusion transcript in most of the cases *** review aims to describe clinical characteristics,diagnostic methods,and therapeutic modalities for this rare tumor to raise awareness among clinicians and surgeons.

关键词： Fibrolamellar carcinoma Hepatocellular carcinoma Hepatitis Cirrhosis Viral hepatitis infection

Validity of QRS Configuration and Myeloperoxidase Level as Determinants of CAD Severity and Prognosis in Patients with STEMI

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World Journal of Cardiovascular Diseases 2021年第1期11卷 82-97页

作者： Wael Ali Khalil mohamed Abdou abdelhamed Ahmed S. Eldamanhory Cardiology Department Faculty of Medicine Zagazig University Zagazig Egypt

Background: Terminal QRS distortion and fragmentation (fQRS) with elevated myeloperoxidase (MPO) were linked to poor cardiovascular outcomes in acute coronary syndrome. We aimed to investigate these parameters in early prediction of coronary artery disease severity based on SYNTAX score and in-hospital adverse events in STEMI patients. Methods: A total of 215 patients with first STEMI admitted for primary PCI were included in the study. They were divided according to the admission ECG into group I with QRS distortion or fQRS, group II with combined QRS distortion and fQRS, and group III without QRS distortion or fQRS. Myeloperoxidase and troponin I levels, ST resolution ratio, left ventricular EF%, and severity of coronary artery lesions using SYNTAX risk score were measured. Results: MPO level, SYNTAX score, and in-hospital mortality were higher in group I and II and were higher in group II compared to group I. By regression analysis, QRS distortion, fQRS, and MPO > 412 ng/ml were independent predictors of both CAD severity and in-hospital mortality. DM was an independent predictor of CAD severity (OR: 2.851, P 0.012) while high SYNTAX score was an independent predictor of in-hospital mortality (OR: 6.113, P 0.001). Adding MPO level to any QRS configuration pattern increased predictive value for the detection of CAD severity that was more evident in the combined QRS distortion and fragmentation. Conclusion: Terminal QRS distortion, fragmentation, or combined QRS distortion and fragmentation have a significant value in predicting in-hospital adverse events and CAD severity

关键词： QRS Distortion QRS Fragmentation Myeloperoxidase Level SYNTAX Score ST-Elevation Myocardial Infarction