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Causes of gastrointestinal bleeding in children based on endoscopic evaluation at a tertiary care center in Bahrain

World journal of Gastrointestinal Endoscopy 2023年第4期15卷 297-308页

作者： Hasan M Isa Fatema A Alkharsi Hana A Ebrahim kamel j walwil jumana A Diab Nafelah M Alkowari Department of Pediatrics Salmaniya Medical ComplexManama 26671Bahrain Department of Pediatrics Arabian Gulf UniversityManama 26671Bahrain Department of Pediatrics Royal College of Surgeons in Ireland-Medical University of BahrainBusaiteen 15503Bahrain Department of Pediatrics King Hamad University HospitalMuharraq 24343Bahrain

BACKGROUND Gastrointestinal bleeding(GIB)is a serious health problem worldwide,particularly during *** can be an alarming sign of an underlying *** endoscopy(GIE)is a safe method for the diagnosis and treatment of GIB in most *** To determine the incidence,clinical presentation,and outcomes of GIB in children in Bahrain over the last two *** This was a retrospective cohort review of the medical records of children with GIB who underwent endoscopic procedures in the Pediatric Department at Salmaniya Medical Complex,Bahrain,between 1995 and *** data,clinical presentation,endoscopic findings,and clinical outcomes were *** was classified into upper(UGIB)and lower(LGIB)GIB according to the site of *** were compared with respect to patients’sex,age,and nationality using the Fisher’s exact,Pearson’sχ2,or the Mann-Whitney U *** A total of 250 patients were included in this *** median incidence was 2.6/100000 per year(interquartile range,1.4-3.7)with a significantly increasing trend over the last two decades (P < 0.0001). Most patients were males (n = 144, 57.6%). Themedian age at diagnosis was 9 years (5-11). Ninety-eight (39.2%) patients required upper GIEalone, 41 (16.4%) required colonoscopy alone, and 111 (44.4%) required both. LGIB was morefrequent (n = 151, 60.4%) than UGIB (n = 119, 47.6%). There were no significant differences in sex (P = 0.710), age (P = 0.185), or nationality (P = 0.525) between the two groups. Abnormalendoscopic findings were detected in 226 (90.4%) patients. The common cause of LGIB was inflammatorybowel disease (IBD) (n = 77, 30.8%). The common cause of UGIB was gastritis (n = 70, 28%).IBD and undetermined cause for bleeding were higher in the 10-18 years group (P = 0.026 and P =0.017, respectively). Intestinal nodular lymphoid hyperplasia, foreign body ingestion, andesophageal varices were more common in the 0-4 years group (P = 0.034, P < 0.0001

关键词： Pediatric Gastrointestinal bleeding Endoscopy Causes Outcome Bahrain

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Actual TDoA-based augmentation system for enhancing cybersecurity in ADS-B

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Chinese journal of Aeronautics 2021年第2期34卷 217-228页

作者： Ahmed AbdelWahab ELMARADY kamel RAHOUMA Faculty of Engineering Minia UniversityMinia 61519Egypt

Currently, cybersecurity and cyber resilience are emerging and urgent issues in nextgeneration air traffic surveillance systems, which depend primarily on Automatic Dependent Surveillance-Broadcast(ADS-B) owing to its low cost and high accuracy. Unfortunately, ADS-B is prone to cyber-attacks. To verify the ADS-B positioning data of aircraft, multilateration(MLAT)techniques that use Time Differences of Arrivals(TDoAs) have been proposed. MLAT exhibits low accuracy in determining aircraft positions. Recently, a novel technique using a theoretically calculated TDoA fingerprint map has been proposed. This technique is less dependent on the geometry of sensor deployment and achieves better accuracy than MLAT. However, the accuracy of the existing technique is not sufficiently precise for determining aircraft positions and requires a long computation time. In contrast, this paper presents a reliable surveillance framework using an Actual TDoA-Based Augmentation System(ATBAS). It uses historically recorded real-data from the OpenSky network to train our TDoA fingerprint grid network. Our results show that the accuracy of the proposed ATBAS framework in determining the aircraft positions is significantly better than those of the MLAT and expected TDoA techniques by 56.93% and 48.86%, respectively. Additionally, the proposed framework reduced the computation time by 77% compared with the expected TDoA technique.

关键词： ADS-B Cybersecurity Cyber resilience k-Nearest Neighbors(k-NN)classifier Machine learning Multilateration

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Improved Local Projection for the Generalized Stokes Problem

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Advances in Applied Mathematics and Mechanics 2009年第6期1卷 862-873页

作者： kamel Nafa Department of Mathematics and Statistics Sultan Qaboos UniversityCollege of ScienceP.O.Box 36Al-Khoudh 123MuscatOMAN

We analyze pressure stabilized finite element methods for the solution of the generalized Stokes problem and investigate their stability and convergence *** important feature of the methods is that the pressure gradient unknowns can be eliminated locally thus leading to a decoupled system of *** the stability of the method has been established,for the homogeneous Stokes equations,the proof given here is based on the existence of a special interpolant with additional orthogonal property with respect to the projection *** makes it much simpler and more *** resulting stabilized method is shown to lead to optimal rates of convergence for both velocity and pressure approximations.

关键词： Generalized Stokes equations stabilized finite elements local projection convergence error estimates

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A combined contour lines iteration algorithm and Delaunay triangulation for terrain modeling enhancement

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Geo-Spatial Information Science 2023年第3期26卷 558-576页

作者： Yehia Miky Abdullah kamel Ahmed Alshouny Department of Geomatics King Abdul aziz UniversityJeddahSaudi Arabia Faculty of Engineering Aswan UniversityAswanEgypt National Water Research Center Survey Research InstituteGizaEgypt

Digital Elevation Models(DEMs)play a crucial role in civil and environmental applications,such as hydrologic and geologic analyses,hazard monitoring,natural resources exploration,***,DEMs can be generated from various data sources,such as ground surveys,photogrammetric stereo methods,satellite images,laser scanning,and digitized contour *** with other data sources,contour lines are still the cheapest and more common data source becausethey cover all areas,at different scales,in most *** there are different algorithms and technologies for interpolation in between contour lines,DEMs extracted solely from contours still suffer from poor terrain quality representation,which in turn negatively affects the quality of analytical applications *** this paper,an approach for improving the digital terrain modeling based on contour line densification and Delaunay triangulation is presented to acquire a more suitable DEM for hydrographic modeling and its *** proposed methodology was tested using a variety of terrain patterns in terms of intensity:hilly,undulated,and plain(1:25,000 topographic map,5 m contour interval).The precision of the extracted GRID model increases as the number of added contours *** four contour lines,the Root Mean Square Error(RMSE)of examining points were 0.26 m,0.29 m,and 0.05 m for hilly,undulated,and plain samples,respectively,and the Mean Absolute Error(MAE)were 0.50 m,0.48 m,and 0.17 *** convergence probabilities between extracted and original flow lines for the same regions were 96.91%,94.93%,and 84.03%.Applying the methodology,experimental results indicate that the developed approach provides a significant advantage in terrain modeling enhancement,generates DEMs smoothly and effectively from contours,mitigates problems and reduces uncertainties.

关键词： Contours Digital Elevation Model(DEM) Triangulated Irregular Network(TIN) Delaunay triangulation

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New Results on PWARX Model Identification Based on Clustering Approach

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International journal of Automation and computing 2014年第2期11卷 180-188页

作者： Zeineb Lassoued kamel Abderrahim Numerical Control of Industrial Processes National School of Engineers of GabesUniversity of GabesSt Omar Ibn-Khattab 6029 Gabes Tunisia

This paper deals with the problem of piecewise auto regressive systems with exogenous input(PWARX) model identification based on clustering solution. This problem involves both the estimation of the parameters of the affine sub-models and the hyper planes defining the partitions of the state-input regression. The existing identification methods present three main drawbacks which limit its effectiveness. First, most of them may converge to local minima in the case of poor initializations because they are based on the optimization using nonlinear criteria. Second, they use simple and ineffective techniques to remove outliers. Third, most of them assume that the number of sub-models is known a priori. To overcome these drawbacks, we suggest the use of the density-based spatial clustering of applications with noise(DBSCAN) algorithm. The results presented in this paper illustrate the performance of our methods in comparison with the existing approach. An application of the developed approach to an olive oil esterification reactor is also proposed in order to validate the simulation results.

关键词： Hybrid systems piecewise autoregressive systems with exogenous input(PWARX) model clustering identification density-based spatial clustering of applications with noise(DBSCAN) clustering technique experimental validation.

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Effectiveness of royal jelly supplementation in glycemic regulation:A systematic review

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World journal of Diabetes 2019年第2期10卷 96-113页

作者： kamel Omer Maxwell j Gelkopf Genevieve Newton Department of Human Health and Nutritional Sciences University of Guelph

BACKGROUND Royal jelly(Rj)has been observed to have therapeutic properties in diabetic individuals,including the reduction of high blood *** systematic review synthesized existing evidence to investigate the effectiveness of Rj supplementation in managing measures of blood *** To determine the effectiveness of Rj supplementation on glycemic responses in healthy and non-insulin dependent diabetic adults,as well as animal models of *** This was a systematic review employing the PRISMA ***-reviewed,published articles were extracted from several databases using key words related to target population,intervention and outcome and hand-selected for *** articles proceeded to data extraction phase,where information on target parameters and effectiveness of treatment was *** this,the risk of bias for each included study was ***,the long-term and immediate effectiveness of Rj supplementation in glycemic control were assessed using the Grading of Recommendations,Assessment,Development and Evaluations(GRADE)tool,which rates the quality of *** Of 168 articles extracted from database searching,eighteen were included for analysis in this systematic *** the studies,studied populations,intervention styles and outcome measures were largely *** this,the results in studies indicate a general trend of positive effect of Rj in glycemic regulation in vitro and in ***,some dose-dependent glycemic effects were observed,along with some large effect *** risk of bias for human and animal studies is generally low-unclear risk,although lack of blinding is a serious concern in both ***,as per the GRADE tool,the quality of evidence is low,and very low for long-term and immediate effectiveness of Rj,respectively.A major limitation affecting evidence quality is the heterogeneity among included *** blood glucose and glucose clearance a

关键词： Royal jelly Type 2 diabetes Dietary supplement Glycemic control 10-hydroxy-trans-2-decenoic acid Hyperglycemia Adults Animals

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A comparative study between simplified and nonlinear dynamic methods for estimating liquefaction potential

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journal of Rock Mechanics and Geotechnical Engineering 2017年第5期9卷 955-966页

作者： kamel Filali Badreddine Sbartai LMGHU Laboratory University of 20 August 1955-Skikda Skikda 21000 Algeria University of Badji Mokhtar Annaba 23000 Algeria

This paper estimated the liquefaction potential of a saturated soil deposit subjected to a horizontal seismic excitation at its base using the total stress approach.A comparative analysis between the simplified and the nonlinear dynamic methods was used to verify to what extent the simplified method could be *** order to generalise the reliability of the simplified method for any value of the maximum acceleration for the used earthquakes,a correction for the maximum acceleration less than 0.3 g was proposed based on the comparison of safety factor values determined by the dynamic method illustrated by the equivalent linear model with lumped masses and the simplified method for a given profile of soil subjected to 38 *** nonlinear behaviour of soil was represented by two hyperbolic models:Hardin and Drnevich,and *** determine the cyclic resistance ratio(CRR),the cone penetration test(CPT) based method,the standard penetration test(SPT) based method,and the shear wave velocity based method were *** safety factor was calculated as the ratio of CRR/CSR,where CSR represents the cyclic stress *** results of the proposed correction have given smaller values of the safety factor compared to the nonlinear dynamic methods for the maximum acceleration less than 0.3 *** other words,by considering this correction,the most unfavourable case is always given by the modified simplified method.

关键词： Liquefaction Soil Earthquake Simplified method Nonlinear dynamic method

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TWO DIMENSIONAL MELLIN TRANSFORM IN QUANTUM CALCULUS

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Acta Mathematica Scientia 2018年第2期38卷 546-560页

作者： kamel BRAHIM Latifa RIAHI Faculty of Sciences of Tunis. University of Tunis El Manar Tunisia

In this article, we introduce the two dimensional Mellin transform M4（f）（s,t）, give some properties, establish the Paley-Wiener theorem and Plancherel formula, present the Hausdorff-Young inequality, and find seve... 详细信息

关键词： Quantum calculus Two dimensional Mellin transform q-Double integral

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GENERALIZED DISCRETE Q-HERMITE I POLYNOMIALS AND Q-DEFORMED OSCILLATOR

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Acta Mathematica Scientia 2018年第4期38卷 1411-1426页

作者： kamel MEZLINI Neji BETTAIBI High Institute of Applied Sciences and Technologies of Mateur University of Carthage Tunisia Department of Mathematics College of Science Qassim University KSA

In this paper, we present an explicit realization of q-deformed Calogero-Vasiliev algebra whose generators are first-order q-difference operators related to the generalized dis- crete q-Hermite I polynomials recently ... 详细信息

关键词： basic orthogonal polynomials quantum algebra coherent states

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Pressure-broadened atomic Li(2s-2p) line perturbed by ground neon atoms in the spectral wings and core

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Chinese Physics B 2017年第7期26卷 67-74页

作者： Sabri Bouchoucha kamel Alioua Moncef Bouledroua Physics Department Badji Mokhtar University Laboratoire de Physique de la Matière et du Rayonnement Chérif Messaidia University Laboratoire de Physique des Rayonnements Badji Mokhtar University

Full quantum calculations are performed to investigate the broadening profiles of the atomic lithium Li（2s-2p） resonance line induced by interactions with ground Ne（2s^22p^6） perturbers in the spectral wings and core. The X^2Σ~＋, A^2Π,and B^2Σ~＋ potential-energy curves of the two first low lying Li Ne molecular states, as well as the corresponding transition dipole moments, are determined with ab initio methods based on the SA-CASSCF-MRCI calculations. The emission and absorption coefficients in the wavelength range 550-800 nm and the line-core width and shift are investigated theoretically for temperatures ranging from 130 K to 3000 K. Their temperature dependence is analyzed, and the obtained results are compared with the previous experimental measurements and theoretical works.

关键词： pressure broadening emission and absorption coefficients linewidth lineshift

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