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Acta Pharmaceutica Sinica B 2016年第2期6卷 163-169页

作者： mohamed Z.Dawoud mohamed Nasr Department of Pharmaceutics and Industrial Pharmacy Faculty of Pharmacy Helwan University

Colloidal lipid particles such as solid lipid nanoparticles and liquid crystalline nanoparticles have great opportunities as drug carriers especially for lipophilic drugs intended for intravenous administration. In order to evaluate drug release from these nanoparticles and determine their behavior after administration, emulsion droplets were used as a lipophilic compartment to which the transfer of a model drug was measured. The detection of the model drug transferred from monoolein cubic particles and trimyristin solid lipid nanoparticles into emulsion droplets was performed using a flow cytometric technique. A higher rate and amount of porphyrin transfer from the solid lipid nanoparticles compared to the monoolein cubic particles was observed. This difference might be attributed to the formation of a highly ordered particle which leads to the expulsion of drug to the surface of the crystalline ***, the sponge-like structure of the monoolein cubic particles decreases the rate and amount of drug transferred. In conclusion, the flow cytometric technique is a suitable technique to study drug transfer from these carriers to large lipophilic acceptors. Monoolein cubic particles with their unique structure can be used successfully as a drug carrier with slow drug release compared with trimyristin nanoparticles.

关键词： Cubic particles Drug release Drug transfer Flow cytometric technique Emulsion droplets Solid lipid nanoparticles Porphyrin

Novel Framework for Generating Criminals Images Based on Textual Data Using Identity GANs

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Computers, Materials & Continua 2023年第7期76卷 383-396页

作者： mohamed Fathallah mohamed Sakr Sherif Eletriby Department of Computer Science Faculty of Computers and InformationKafrelsheikh UniversityKafrelsheikhEgypt Department of Computer Science Faculty of Computers and InformationMenoufia UniversityMenoufiaEgypt

Text-to-image generation is a vital task in different fields,such as combating crime and terrorism and quickly arresting *** several years,due to a lack of deep learning and machine learning resources,police officials required artists to draw the face of a *** methods of identifying criminals are inefficient and *** paper presented a new proposed hybrid model for converting the text into the nearest images,then ranking the produced images according to the available *** framework contains two main steps:generation of the image using an Identity Generative Adversarial Network(IGAN)and ranking of the images according to the available data using multi-criteria decision-making based on neutrosophic *** IGAN has the same architecture as the classical Generative Adversarial Networks(GANs),but with different modifications,such as adding a non-linear identity block,smoothing the standard GAN loss function by using a modified loss function and label smoothing,and using mini-batch *** model achieves efficient results in Inception Distance(FID)and inception score(IS)when compared with other architectures of GANs for generating images from *** IGAN achieves 42.16 as FID and 14.96 as *** it comes to ranking the generated images using Neutrosophic,the framework also performs well in the case of missing information and missing data.

关键词： GAN deep learning text-to-image identity GAN

Decomposition Based Fuzzy Model Predictive Control Approaches for Interconnected Nonlinear Systems

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International Journal of Automation and computing 2019年第3期16卷 369-388页

作者： Latifa Dalhoumi mohamed Chtourou mohamed Djemel Control and Energy Management Laboratory (CEM-Lab) National School of Engineering of Sfax

This paper proposes fuzzy model predictive control(FMPC)strategies for nonlinear interconnected systems based mainly on a system decomposition ***,the Takagi-Sugeno(TS)fuzzy model is formulated in such a way to describe the behavior of the nonlinear *** on that description,a fuzzy model predictive control is *** system under consideration is decomposed into several *** each subsystem,the main idea consists of the decomposition of the control action into two parts:The decentralized part contains the parameters of the subsystem and the centralized part contains the elements of other *** to such decomposition,two strategies are defined aiming to circumvent the problems caused by interconnection bet ween *** feasibility and efficiency of the proposed method are illustrated through numerical examples.

关键词： Model predictive control centralized control decentralized control Takagi-Sugeno(TS)fuzzy models·interconnected nonlinear systems fuzzy model predictive control parallel distributed compensation

PRECISE SMOOTHING EFFECTS OF HOMOGENEOUS LANDAU EQUATION IN SOBOLEV SPACES

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Acta Mathematica Scientia 2012年第3期32卷 1245-1254页

作者： mohamed Najeme Universit'e de Rouen UMR-6085Math'ematiques76801 Saint Etienne du RouvrayFrance

In this work, we study the smoothing effect of Cauchy problem in Sobolev space for the spatially homogeneous Landau equation in the Maxwellian case. We obtain a precise estimate with respect to time variable, which im... 详细信息

关键词： Landau equation smoothing effect of Cauchy problem Sobolev spaces

High performance decoupled active and reactive power control for three-phase grid-tied inverters using model predictive control

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Protection and Control of Modern Power Systems 2021年第1期6卷 311-329页

作者： mohamed Azab EEET Department Yanbu Industrial CollegeYanbu AL SinaiyahSaudi Arabia EEET Department Faculty of EngineeringBenha UniversityBanhaEgypt

Finite control set-model predictive control (FCS-MPC) is employed in this paper to control the operation of a three-phase grid-connected string inverter based on a direct PQ control scheme. The main objective is to achieve high-performance decoupled control of the active and reactive powers injected to the grid from distributed energy resources (DER).The FCS-MPC scheme instantaneously searches for and applies the optimum inverter switching state that can achieve certain goals, such as minimum deviation between reference and actual power;so that both power components (P and Q) are well controlled to their reference *** addition, an effective method to attenuate undesired cross coupling between the P and Q control loops, which occurs only during transient operation, is investigated. The proposed method is based on the variation of the weight factors of the terms of the FCS-MPC cost function, so a higher weight factor is assigned to the cost function term that is exposed to greater disturbance. Empirical formulae of optimum weight factors as functions of the reference active and reactive power signals are proposed and mathematically derived. The investigated FCS-MPC control scheme is incorporated with the LVRT function to support the grid voltage in fulfilling and accomplishing the up-to-date grid codes. The LVRT algorithm is based on a modification of the references of active and reactive powers as functions of the instantaneous grid voltage such that suitable values of P and Q are injected to the grid during voltage *** performance of the elaborated FCS-MPC PQ scheme is studied under various operating scenarios, including steady-state and transient conditions. Results demonstrate the validity and effectiveness of the proposed scheme with regard to the achievement of high-performance operation and quick response of grid-tied inverters during normal and fault modes.

关键词： Model predictive control Finite control set Grid-connected inverter Active power Reactive power Distributed generation Low voltage ride through PQ theory FCS-MPC LVRT

State Observer Based Dynamic Fuzzy Logic System for a Class of SISO Nonlinear Systems

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International Journal of Automation and computing 2013年第2期10卷 118-124页

作者： mohamed Hamdy Department of Industrial Electronics and Control Engineering Faculty of Electronic Engineering Menofia University

This paper presents an observer based dynamic fuzzy logic system （DFLS） scheme for a class of unknown single-input single-output （SISO） nonlinear dynamic systems with external disturbances. The proposed approach does not need the availability of the state variables. Within this scheme, the DFLS is employed to identify the unknown nonlinear dynamic system. The control law and parameter adaptation laws of the DFLS are derived based on Lyapunov synthesis approach. The control law is robustfied in H∞ sense to attenuate external disturbance, model uncertainties, and fuzzy approximation errors. It is shown that under appropriate assumptions, it guarantees the boundedness of all the signals in the closed-loop system and the asymptotic convergence to zero of tracking errors. The proposed method is applied to an inverted pendulum system to verify the effectiveness of the proposed algorithms.

关键词： Single-input single-output (SISO) nonlinear system dynamic fuzzy logic system (DFLS) observer Lyapunov synthesis approach stability analysis.

STABILITY OF CONSTANT MEAN CURVATURE HYPERSURFACES OF REVOLUTION IN HYPERBOLIC SPACE

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Acta Mathematica Scientia 2013年第3期33卷 830-838页

作者： mohamed JLELI Department of Mathematics King Saud Unibersity

In this article, by solving a nonlinear differential equation, we prove the existence of a one parameter family of constant mean curvature hypersurfaces in the hyperbolic space with two ends. Then, we study the stabil... 详细信息

关键词： Hypersurface hyperbolic space mean curvature

Complexity Analysis of an Interior Point Algorithm for the Semidefinite Optimization Based on a Kernel Function with a Double Barrier Term

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Acta Mathematica Sinica,English Series 2015年第3期31卷 543-556页

作者： mohamed ACHACHE Laboratoire de Mathématiques Fondamentales et Numériques Faculté des Sciences Université Ferhat Abbas Sétif 1Algérie

In this paper, we establish the polynomial complexity of a primal-dual path-following interior point algorithm for solving semidefinite optimization（SDO） problems. The proposed algorithm is based on a new kernel function which differs from the existing kernel functions in which it has a double barrier term. With this function we define a new search direction and also a new proximity function for analyzing its complexity. We show that if q1 〉 q2 〉 1, the algorithm has O（（q1 ＋ 1） nq1＋1/2（q1-q2）logn/ε）and O（（q1 ＋ 1）2（q1-q2）^3q1-2q2＋1√n logn/c） complexity results for large- and small-update methods, respectively.

关键词： Semidefinite optimization kernel functions primal-dual interior point methods large andsmall-update algorithms complexity of algorithms

Novel chaos game optimization tuned-fractional-order PID fractional-order PI controller for load-frequency control of interconnected power systems

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Protection and Control of Modern Power Systems 2022年第1期7卷 213-232页

作者： mohamed Barakat Communication and Computer Department Faculty of EngineeringNahda UniversityBani-SweifEgypt

In this work,chaos game optimization(CGO),a robust optimization approach,is employed for efficient design of a novel cascade controller for four test systems with interconnected power systems(IPSs)to tackle load-frequency con-trol(LFC)*** CGO method is based on chaos theory principles,in which the structure of fractals is seen via the chaotic game principle and the fractals’self-similarity characteristics are *** is applied in LFC studies as a novel application,which reveals further research gaps to be *** practical implementation,it is also highly desirable to keep the controller structure ***,in this paper,a CGO-based controller of fractional-order(FO)proportional-integral-derivative-FO proportional-integral(FOPID-FOPI)controller is proposed,and the integral time multiplied absolute error performance function is ***,the proposed CGO-based FOPID-FOPI controller is tested with and without the nonlinearity of the governor dead band for a two-area two-source model of a non-reheat *** is a common test system in the literature.A two-area multi-unit system with reheater-hydro-gas in both areas is *** further generalize the advantages of the proposed scheme,a model of a three-area hydrothermal IPS including generation rate constraint nonlinearity is *** each test system,comparisons with relevant existing studies are *** demonstrate the superiority of the proposed scheme in reducing settling time,and frequency and tie-line power deviations.

关键词： Interconnected power system Chaos game optimization Cascade control Load frequency control FOPID-FOPI controller Generation rate constraint(GRC) Governor dead band(GDB)

Retrofitting Sprinkler Systems for Suppressing Dust Generated by Moving Vehicles Inside Farms

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Agricultural Sciences in China 2011年第3期10卷 376-383页

作者： mohamed Thabit College of Bio-Systems Engineering and Food Science Zhejiang University

Fugitive dust is one of the well known problems in agriculture and it affects both humans and machine producing quality. Dust problems can seriously cause harmful diseases to workers and ruin expensive equipments. In this study, a dust formation generated in open environment by vehicles was analyzed on unpaved roads. Formed dust was measured by calculating total forces on the PM10 （airborne particles smaller than 10 mm） of dust particles, such as air velocity, gravity forces and air turbulence generated by the moving vehicle. The water fogger nozzle discharge was measured to determine the approximate droplets quantity in the air. The foggers were used to suppress the generated dust in an open environment via installing a proposed automatic suppression system which opens automatically when vehicles pass under the system. The relationship between water droplet speed and ability of collecting fugitive dust showed that high air temperature above 40oC and wind speed above 10 m s-1 have negative effects on the system’s ability of collecting dust due to evaporation of small radius droplets and/or drifting water droplets away from the effective area. The overall system efficiency was found to be 85% and the proposed dust suppression system was found to be a satisfying solution for reducing fugitive dust hazards.

关键词： fugitive dust air velocity gravity forces air turbulence water fogger nozzles discharge automatic suppression system sprinkler systems