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Relative (n, k) -Weak Cotorsion Modules

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ALGEBRA COLLOQUIUM 2024年第3期31卷 481-498页

作者： Amini, Mostafa Amzil, Houda Bennis, driss Payame Noor Univ Fac Sci Dept Math Tehran Iran Chouaib Doukkali Univ Fac Sci El Jadida Dept Math El Jadida Morocco Mohammed V Univ Rabat Fac Sci Dept Math Rabat Morocco

Let R be a ring and n, k be two non-negative integers. As an extension of several known notions, we introduce and study (n, k)-weak cotorsion modules using the class of right R-modules with n-weak flat dimensions at m... 详细信息

关键词： (n, k)-weak cotorsion module n-weak injective module n-weak flat module n-super finitely presented module COVERS ENVELOPES RINGS

Optimal rejection of bounded perturbations in linear leader-following consensus protocol: invariant ellipsoid method

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Science China(Information Sciences) 2024年第8期67卷 24-34页

作者： Siyuan WANG Andrey POLYAKOV Min LI Gang ZHENG driss BOUTAT INSA Centre Val de Loire INRIA

The objective of the invariant ellipsoid method is to minimize the smallest invariant and attractive set of a linear control system operating under the influence of bounded external disturbances. This study extends the application of this method to address the leader-following consensus problem. Initially, a linear control protocol is designed for the multi-agent system in the absence of disturbances. Subsequently, in the presence of bounded disturbances, by employing a similar linear control protocol, a necessary and sufficient condition is introduced to derive the optimal control parameters for the multi-agent system such that the state of followers converges to and remains in a minimal invariant ellipsoid around the state of the leader.

关键词： disturbance invariant ellipsoid leader-following consensus multi-agent system

A novel medical image data protection scheme for smart healthcare system

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CAAI Transactions on Intelligence Technology 2024年第4期9卷 821-836页

作者： Mujeeb Ur Rehman Arslan Shafique Muhammad Shahbaz Khan Maha driss Wadii Boulila Yazeed Yasin Ghadi Suresh Babu Changalasetty Majed Alhaisoni Jawad Ahmad School of Computer Science and Informatics Cyber Technology InstituteDe Montfort UniversityLeicesterUK Department of Biomedical Engineering University of GlasgowGlasgowUK School of Computing Engineering and the Built EnvironmentEdinburgh Napier UniversityEdinburghUK Robotics and Internet‐of‐Things Laboratory Prince Sultan UniversityRiyadhSaudi Arabia Department of Computer Science Al Ain UniversityAl AinUnited Arab Emirates Department of Computer Engineering College of Computer Science King Khalid UniversityAbhaSaudi Arabia Computer Sciences Department College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadhSaudi Arabia

The Internet of Multimedia Things(IoMT)refers to a network of interconnected multimedia devices that communicate with each other over the ***,smart healthcare has emerged as a significant application of the IoMT,particularly in the context of knowledge‐based learning *** healthcare systems leverage knowledge‐based learning to become more context‐aware,adaptable,and auditable while maintain-ing the ability to learn from historical *** smart healthcare systems,devices capture images,such as X‐rays,Magnetic Resonance *** security and integrity of these images are crucial for the databases used in knowledge‐based learning systems to foster structured decision‐making and enhance the learning abilities of ***,in knowledge‐driven systems,the storage and transmission of HD medical images exert a burden on the limited bandwidth of the communication channel,leading to data trans-mission *** address the security and latency concerns,this paper presents a lightweight medical image encryption scheme utilising bit‐plane decomposition and chaos *** results of the experiment yield entropy,energy,and correlation values of 7.999,0.0156,and 0.0001,*** validates the effectiveness of the encryption system proposed in this paper,which offers high‐quality encryption,a large key space,key sensitivity,and resistance to statistical attacks.

关键词： data analysis medical image processing security

Numerical and Experimental Study of the Impact of Key Parameters on a PVT Air Collector:Mass Flow Rate and Duct Depth

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Journal of Thermal Science 2021年第5期30卷 1625-1642页

作者： Ismail BAKLOUTI Zied driss National School of Engineers of Monastir University of Monastir5019MonastirTunisia Laboratory of Electromechanical Systems(LASEM) National School of Engineers of SfaxUniversity of Sfax3038SfaxTunisia

The PVT-air solar system simultaneously generates electrical and thermal ***,increasing the cost-effectiveness of the system requires an appropriate choice of key parameters such as mass flow rate and air channel *** this paper,a PVT-air kit of a single module with a 30°slope was used to measure photovoltaic electricity and air heating power in the city of Sfax,***,a computer method was implemented using the ANSYS Fluent 17.0 software and the MATLAB program to analyse the properties of the airflow and to characterise PVT-air yields under different mass flow rates and *** the comparison of numerical and experimental data,the numerical method was validated with a good ***,we have found that increasing of the airflow rate improves the thermal efficiency with a slight change on electrical ***,the reduction in depth shows an improvement on thermal efficiency and a negligible effect on electrical ***,we have presented the thermal and electrical performance of PVT-air as a function of the key parameters with the Hottel-Whillier-Bliss formulation.

关键词： solar energy PVT-air thermal experimental numerical performance

On Crossed Product Algebras over Henselian Valued Fields

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Algebra Colloquium 2020年第3期27卷 389-404页

作者： driss Bennis Karim Mounirh Faculty of Sciences Research Center CeReMAR Mohammed V University in RabatRabatMorocco

Let D be a tame central division algebra over a Henselian valued field E,D be the residue division algebra of D,E be the residue field of E,and n be a positive *** prove that M_(n)(D)has a strictly maximal subfield which is Galois(resp.,abelian)over E if and only if M_(n)(D)has a strictly maximal subfield K which is Galois(resp.,abelian)and tame over E withГ_(K)■Г_(D),whereГ_(K)andГ_(D)are the value groups of K and D,*** partially generalizes the result proved by Hanke et *** 2016 for the case n=1.

关键词： (graded)Brauer group valued division algebras Henselization graded division algebras gauges

Stabilization of an axially moving tape system with boundary disturbances via the ADRC approach

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Control Theory and Technology 2022年第3期20卷 349-360页

作者： My driss Aouragh Mohamed Nahli Maths Department AM2CSI GroupMSISI LaboratoryFST ErrachidiaMoulay Ismail University of MeknesPO.BOX 509 BoutalamineErrachidia52000Drâa-TafilaletMorocco AM2CSI Group MSISI LaboratoryFST ErrachidiaMoulay Ismail University of MeknesPO.BOX 509 BoutalamineErrachidia52000Drâa-TafilaletMorocco

In this paper,the boundary stabilization problem of an axially moving tape system is *** tape moves between two sets of rollers,where the right roller is fixed and the left roller,with its mass taken into account,is free to move,rotate,and subject to external *** active disturbance rejection control approach is adopted in the ***,extended state observers are designed to estimate the disturbances,and then,feedback controllers are proposed to cancel the effect of the *** well-posedness of the closed-loop system is proved by the semigroup ***,the exponential stability is achieved by constructing a suitable Lyapunov ***,numerical simulations are given to support these results.

关键词： Axially moving beam Hybrid system Active disturbance rejection control Boundary disturbances Exponential stabilization

Surface Weather Parameters Forecasting Using Analog Ensemble Method over the Main Airports of Morocco

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Journal of Meteorological Research 2022年第6期36卷 866-881页

作者： Badreddine ALAOUI driss BARI Yamna GHABBAR Direction Generale de la Meteorologie Centre National de Recherches Meteorologique(CNRM)Casablanca BP 8106Morocco Department of Mathematics Computer Sciences and GeomaticsHassania School for Public WorksCasablanca P.O.Box 8108Morocco

Surface weather parameters detain high socioeconomic impact and strategic insights for all users,in all domains(aviation,marine traffic,agriculture,etc.).However,those parameters were mainly predicted by using deterministic numerical weather prediction(NWP)models that include a wealth of *** purpose of this study is to contribute in improving low-cost computationally ensemble forecasting of those parameters using analog ensemble method(AnEn)and comparing it to the operational mesoscale deterministic model(AROME)all over the main airports of Morocco using 5-yr period(2016-2020)of hourly *** analog for a given station and forecast lead time is a past prediction,from the same model that has similar values for selected predictors of the current model *** analogs verifying observations form AnEn ensemble *** picture seasonal dependency,two configurations were set;a basic configuration where analogs may come from any past date and a restricted configuration where analogs should belong to a day window around the target ***,a new predictors weighting strategy is developed by using machine learning techniques(linear regression,random forest,and XGBoost).This approach is expected to accomplish both the selection of relevant predictors as well as finding their optimal weights,and hence preserve physical meaning and correlations of the used weather *** analysis shows that the developed AnEn system exhibits a good statistical consistency and it significantly improves the deterministic forecast performance temporally and spatially by up to 50%for Bias(mean error)and 30%for RMSE(root-mean-square error)at most of the *** improvement varies as a function of lead times and seasons compared to the AROME model and to the basic AnEn *** results show also that AnEn performance is geographically dependent where a slight worsening is found for some airports.

关键词： analog ensemble machine learning surface weather parameters ensemble forecasting AROME(Applications de la Rechercheàl’OpérationnelàMéso-Echelle) predictors weighting strategy

Gorenstein n-X-Injective and n-X-Flat Modules with Respect to a Special Finitely Presented Module

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Algebra Colloquium 2021年第4期28卷 673-688页

作者： Mostafa Amini Arij Benkhadra driss Bennis Department of Mathematics Faculty of Sciences Payame Noor UniversityTehranIran Department of Mathematics Faculty of Sciences Mohammed V University in RabatRabatMorocco

Let R be a ring,X a class of R-modules and n≥1 an *** intro-duce the concepts of Gorenstein n-X-injective and n-X-flat modules via special finitely presented ***,we obtain some equivalent properties of these modules on n-X-coherent *** we investigate the relations among Gorenstein n-X-injective,n-X-flat,injective and fiat modules on X-FC-rings(i.e.,self n-X-injective and n-X-coherent rings).Several known results are generalized to this new context.

关键词： n-X-coherent ring Gorenstein n-X-injective module Gorenstein module

Dynamic characterization of a stochastic SIR infectious disease model with dual perturbation

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International Journal of Biomathematics 2021年第4期14卷 1-26页

作者： driss Kiouach Yassine Sabbar LPAIS Laboratory Faculty of Sciences Dhar El Mahraz Sidi Mohamed Ben Abdellah UniversityFezMorocco

Environmental perturbations are unavoidable in the propagation of infectious *** this paper,we introduce the stochasticity into the susceptible-infected recovered(SIR)model via thc^parameter perturbation *** stochastic disturbances associated with the disease transmission coefficient and the mortality rate are presented with two perturbations:Gaussian white noise and Levy jumps,*** idea provides an overview of disease dynamics under different random perturbation *** using new techniques and methods,we study certain interesting asymptotic properties of our perturbed model,namely:persistence in the mean,ergodicity and extinction of the *** illustrative purposes,numerical examples are presented for checking the theoretical study.

关键词： SIR epidemic model white noise Levy noise stationary distribution persistence extinction