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  1. Article ; Online: Multi-Objective Message Routing in Electric and Flying Vehicles Using a Genetics Algorithm.

    Alolaiwy, Muhammad / Zohdy, Mohamed

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 3

    Abstract: With progressive technological advancements, the time for electric vehicles (EVs) and unmanned aerial vehicles (UAVs) has finally arrived for the masses. However, intelligent transportation systems need to develop appropriate protocols that enable swift ... ...

    Abstract With progressive technological advancements, the time for electric vehicles (EVs) and unmanned aerial vehicles (UAVs) has finally arrived for the masses. However, intelligent transportation systems need to develop appropriate protocols that enable swift predictive communication among these battery-powered devices. In this paper, we highlight the challenges in message routing in a unified paradigm of electric and flying vehicles (EnFVs). We innovate over the existing routing scheme by considering multi-objective EnFVs message routing using a novel modified genetics algorithm. The proposed scheme identifies all possible solutions, outlines the Pareto-front, and considers the optimal solution for the best route. Moreover, the reliability, data rate, and residual energy of vehicles are considered to achieve high communication gains. An exhaustive evaluation of the proposed and three existing schemes using a New York City real geographical trace shows that the proposed scheme outperforms existing solutions and achieves a 90%+ packet delivery ratio, longer connectivity time, shortest average hop distance, and efficient energy consumption.
    Language English
    Publishing date 2023-01-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23031100
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  2. Article: Implementation of virtual rapid access outpatient clinics for suspected gastrointestinal malignancies during the COVID-19 pandemic: could they become the default in the future?

    Zohdy, Mohamed / Seretis, Charalampos

    Przeglad gastroenterologiczny

    2022  Volume 17, Issue 1, Page(s) 81–82

    Language English
    Publishing date 2022-03-18
    Publishing country Poland
    Document type Journal Article
    ZDB-ID 2596134-2
    ISSN 1897-4317 ; 1895-5770
    ISSN (online) 1897-4317
    ISSN 1895-5770
    DOI 10.5114/pg.2022.114598
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  3. Article ; Online: Challenges of Egyptian patients with systemic lupus erythematosus during the COVID-19 pandemic

    Samar Tharwat / Sherin Zohdy Mohamed / Mohammed Kamal Nassar

    Rheumatology, Vol 59, Iss 4, Pp 237-

    2021  Volume 243

    Keywords systemic lupus erythematosus ; covid-19 ; healthcare ; Medicine ; R
    Language English
    Publishing date 2021-08-01T00:00:00Z
    Publisher Termedia Publishing House
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Routine extensive dissection of the cystic duct during laparoscopic cholecystectomy to reduce the risk of residual choledocholithiasis: an unnecessary step and a potentially hazardous concept.

    Seretis, Charalampos / Zohdy, Mohamed / Padgett, Bethany / Janardhanan, Pradeep

    Przeglad gastroenterologiczny

    2022  Volume 17, Issue 1, Page(s) 67–72

    Abstract: Introduction: Post-cholecystectomy choledocholithiasis can occur from retained stones at the cystic duct stump remnant; however, most surgeons would not proceed with extensive dissection of the cystic duct during routine cholecystectomy, mainly in fear ... ...

    Abstract Introduction: Post-cholecystectomy choledocholithiasis can occur from retained stones at the cystic duct stump remnant; however, most surgeons would not proceed with extensive dissection of the cystic duct during routine cholecystectomy, mainly in fear of inadvertent bile duct injuries, given the frequent anatomical variations of the extrahepatic biliary tree.
    Aim: To determine the need and feasibility of extensive dissection of the cystic duct during laparoscopic cholecystectomy, to reduce the risk of post-cholecystectomy choledocholithiasis.
    Material and methods: We performed a retrospective review of our institutional database of all patients who had magnetic resonance cholangiopancreatography (MRCP) prior to cholecystectomy over a 3-year period (03/2016-04/2019), assessing the anatomical variations of the cystic duct and the incidence of cystic duct stones.
    Results: During the study period, from a total of 763 patients who underwent cholecystectomy for symptomatic gallstones, 284 had undergone pre-operative MRCP and were all included in the final analysis. The typical right lateral insertion of the cystic duct in the midpoint between the confluence of the main hepatic ducts and the ampulla of Vater was identified in less than 50% of the patients. In our series, cystic duct stones were present only in 1.8% of our patients.
    Conclusions: The presence of significant anatomical variations and the low likelihood of incidental cystic duct stones render prophylactic extensive dissection of the cystic duct during standard laparoscopic cholecystectomy a rather unnecessary and probably hazardous step.
    Language English
    Publishing date 2022-03-18
    Publishing country Poland
    Document type Journal Article
    ZDB-ID 2596134-2
    ISSN 1897-4317 ; 1895-5770
    ISSN (online) 1897-4317
    ISSN 1895-5770
    DOI 10.5114/pg.2022.114597
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  5. Article ; Online: Single-centre experience of emergency hernia surgery during COVID-19 pandemic: a comparative study of the operative activity and outcomes before and after the outbreak.

    Malik, Adnan / Zohdy, Mohamed / Ahmad, Aftab / Seretis, Charalampos

    Medicinski glasnik : official publication of the Medical Association of Zenica-Doboj Canton, Bosnia and Herzegovina

    2021  Volume 18, Issue 2, Page(s) 463–467

    Abstract: Aim The outbreak of COVID-19 pandemic in January 2020 affected largely the elective operating for non-urgent surgical pathologies, such as hernias, due to periodical cancellations of the operating lists on a worldwide scale. To the best of our knowledge, ...

    Abstract Aim The outbreak of COVID-19 pandemic in January 2020 affected largely the elective operating for non-urgent surgical pathologies, such as hernias, due to periodical cancellations of the operating lists on a worldwide scale. To the best of our knowledge, the long-term impact of the COVID-19 pandemic in relation to the emergency hernia surgery operative workload and postoperative outcomes remains largely unknown. Methods Retrospective research of admission, operation and inpatient records of all patients who underwent emergency surgery over a 2-year period (2019-2020) was done. Results An 18% increase in terms of emergency hernia surgery operating volume, with a 23% increase of visceral resections due to unsalvageable herniated content strangulation was found. Overall morbidity did not increase during the pandemic period and there was no postoperative mortality or occurrence of COVID-19 related complications. Conclusion Emergency operative management of acutely symptomatic hernias can be safely performed even during the COVID-19 infection peak waves; hernia taxis should be reserved only for patients unfit or unwilling to undergo upfront surgery.
    MeSH term(s) COVID-19 ; Disease Outbreaks ; Hernia ; Herniorrhaphy/statistics & numerical data ; Humans ; Pandemics ; Retrospective Studies
    Language English
    Publishing date 2021-06-04
    Publishing country Bosnia and Herzegovina
    Document type Journal Article
    ZDB-ID 2378942-6
    ISSN 1840-2445 ; 1840-2445
    ISSN (online) 1840-2445
    ISSN 1840-2445
    DOI 10.17392/1383-21
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  6. Book ; Online: Continuous Lyapunov Controller and Chaotic Non-linear System Optimization using Deep Machine Learning

    Mahmoud, Amr / Ismaeil, Youmna / Zohdy, Mohamed

    2020  

    Abstract: The introduction of unexpected system disturbances and new system dynamics does not allow guaranteed continuous system stability. In this research we present a novel approach for detecting early failure indicators of non-linear highly chaotic system and ... ...

    Abstract The introduction of unexpected system disturbances and new system dynamics does not allow guaranteed continuous system stability. In this research we present a novel approach for detecting early failure indicators of non-linear highly chaotic system and accordingly predict the best parameter calibrations to offset such instability using deep machine learning regression model. The approach proposed continuously monitors the system and controller signals. The Re-calibration of the system and controller parameters is triggered according to a set of conditions designed to maintain system stability without compromise to the system speed, intended outcome or required processing power. The deep neural model predicts the parameter values that would best counteract the expected system in-stability. To demonstrate the effectiveness of the proposed approach, it is applied to the non-linear complex combination of Duffing Van der pol oscillators. The approach is also tested under different scenarios the system and controller parameters are initially chosen incorrectly or the system parameters are changed while running or new system dynamics are introduced while running to measure effectiveness and reaction time.

    Comment: 7 pages, 12 figures
    Keywords Electrical Engineering and Systems Science - Systems and Control ; Computer Science - Artificial Intelligence ; Computer Science - Machine Learning
    Subject code 629
    Publishing date 2020-10-28
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online: Evaluation of gps/glonass patch versus rf gps (L1) patch antenna performance parameter

    Aghashirin, Gholam / Zohdy, Hoda S. Abdel Aty / Zohdy, Mohamed A. / Schmidt, Darrell / Timmons, Adam

    2020  

    Abstract: In any wireless communication network and system an antenna is an important element along the propagation path of an electrical signals. Antenna module is a vital component of automated driving systems, it should function as needed in dGPS, HD map ... ...

    Abstract In any wireless communication network and system an antenna is an important element along the propagation path of an electrical signals. Antenna module is a vital component of automated driving systems, it should function as needed in dGPS, HD map correction services, and radio and navigation systems. The main scope of this engineering research work involves the evaluation and determining the performance parameter and characteristic of the GPS/GLONASS patch vs RF GPS L1(1.57542 GHz) patch antenna characteristic. FEKO simulation studies are carried out to extensively compare, make an assessment and evaluate the characteristic and performance parameter, such as the average/passive gain of the proposed antenna in the presence of background noise. Prior to the start of the FEKO simulation studies, a physical mechanical dimension measurements via a Digital instrumentation were conducted for the following: Radiating Element Size: The actual length (L), and width (W), Substrate Material Size: The substrate length (Lsub), width (Wsub), and height (h). The proposed antenna model for GPS only patch antenna operating at 1.57542 GHz and the dual band patch antenna resonating at 1.5925 GHz are developed. To be specific, this work presents the design, modeling, determining passive gain of the RF GPS L1 patch vs. dual band patch antenna with intended targeted applications within the automotive system and space. Simulation are undertaken to generate the RF GPS L1 patch and dual band patch antenna structure respectively for the sole purpose of evaluating the performance of the proposed dual band antenna. Simulation are performed rather than mathematical modelling. The emphasis of this paper is how to obtain the equivalent amount of total passive gain in a GPS vs. that of dual band antenna.
    Keywords Electrical Engineering and Systems Science - Signal Processing
    Subject code 600
    Publishing date 2020-09-07
    Publishing country us
    Document type Book ; Online
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  8. Article: Parameter estimation from experimental laboratory data of HSV-1 by using alternative regression method.

    Alazabi, Fatma A / Zohdy, Mohamed A / Suvas, Susmit

    Systems and synthetic biology

    2013  Volume 7, Issue 4, Page(s) 151–160

    Abstract: In this paper, an estimation of model parameters is performed by using the Alternative Regression (AR) approach on an experimental data set of Herpes Simplex Virus type-1 (HSV-1) infection with innate immune response. Throughout the specified course of ... ...

    Abstract In this paper, an estimation of model parameters is performed by using the Alternative Regression (AR) approach on an experimental data set of Herpes Simplex Virus type-1 (HSV-1) infection with innate immune response. Throughout the specified course of time, the measurements of monocytes, neutrophils, and viral load were obtained from the corneas of infected mice. C57BL/6 (B6) mice were used at Oakland University, Department of Biological Sciences, and the outcome measurements were divided into training and testing data sets. The HSV-1 nonlinear dynamic model is proposed based on the observed data patterns and biological system information. The simulation results of the proposed model showed that they consistently fit the experimental data set. In addition, the sensitivity test and model validation diagnostics are considered to determine the most significant key parameters that affect the dynamics of the HSV-1 system.
    Language English
    Publishing date 2013-06-18
    Publishing country Germany
    Document type Journal Article
    ISSN 1872-5325
    ISSN 1872-5325
    DOI 10.1007/s11693-013-9108-4
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  9. Article: Robust quadratic stabilization applied to design of continuous-time and discrete-time observers.

    Caliskan, Fikret / Zohdy, Mohamed A

    ISA transactions

    2003  Volume 42, Issue 3, Page(s) 381–389

    Abstract: In this paper, an application of a robust quadratic stabilization algorithm (RQSA) to continuous-time and discrete-time observers is presented. The RQSA is based on checking end points of a bounding hyperpolyhedron. The RQSA applied to observers is ... ...

    Abstract In this paper, an application of a robust quadratic stabilization algorithm (RQSA) to continuous-time and discrete-time observers is presented. The RQSA is based on checking end points of a bounding hyperpolyhedron. The RQSA applied to observers is introduced, and implemented for a simplified car model, in both continuous-time and discrete-time case. The paper concludes that the RQSA is feasible to estimate unavailable states, even though there are structured uncertainties in the system matrix and in the measurement matrix.
    Language English
    Publishing date 2003-07-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2012746-7
    ISSN 1879-2022 ; 0019-0578
    ISSN (online) 1879-2022
    ISSN 0019-0578
    DOI 10.1016/s0019-0578(07)60141-4
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  10. Article ; Online: An accurate model of polyglutamine.

    Digambaranath, Jyothi L / Campbell, Tyler V / Chung, Alfred / McPhail, Michael J / Stevenson, Karis E / Zohdy, Mohamed A / Finke, John M

    Proteins

    2011  Volume 79, Issue 5, Page(s) 1427–1440

    Abstract: Polyglutamine repeats in proteins are highly correlated with amyloid formation and neurological disease. To better understand the molecular basis of glutamine repeat diseases, structural analysis of polyglutamine peptides as soluble monomers, oligomers, ... ...

    Abstract Polyglutamine repeats in proteins are highly correlated with amyloid formation and neurological disease. To better understand the molecular basis of glutamine repeat diseases, structural analysis of polyglutamine peptides as soluble monomers, oligomers, and insoluble amyloid fibrils is necessary. In this study, fluorescence resonance energy transfer (FRET) experiments and molecular dynamics simulations using different theoretical models of polyglutamine were conducted. This study demonstrates that a previously proposed simple C(α)C(β) model of polyglutamine, denoted as FCO, accurately reproduced the present FRET results and the results of previously published FRET, triplet-state quenching, and fluorescence correlation studies. Other simple C(α)C(β) models with random coil and extended β-strand parameters, and all-atom models with parm96 and parm99SB force fields, did not match the FRET result well. The FCO is an intrinsically disordered model with a high-effective persistence length producing extended peptides at short lengths (Q(N) < 10). Because of an increasing number of attractive Q-Q interactions at longer lengths, the FCO model becomes increasingly more compact at lengths between Q(N) ∼ 10-16 and is as compact as many folded proteins at Q(N) > 16.
    MeSH term(s) Amyloid/chemistry ; Fluorescence Resonance Energy Transfer ; Molecular Dynamics Simulation ; Peptides/chemistry ; Protein Folding
    Chemical Substances Amyloid ; Peptides ; polyglutamine (26700-71-0)
    Language English
    Publishing date 2011-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 806683-8
    ISSN 1097-0134 ; 0887-3585
    ISSN (online) 1097-0134
    ISSN 0887-3585
    DOI 10.1002/prot.22970
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