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A Reframed Watermark Extraction Approach Using the ABC Algorithm

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Chinese Journal of Electronics 2021年第4期30卷 736-742页

作者： KRICHA Anis KRICHA Zied SAKLY Anis LATIS Lab National School of Engineers of Sousse University of Sousse National School of Engineers of Monastir University of Monastir Higher Institute of Applied Science and Technology of sousse University of Sousse ESIR Research Unit National School of Engineers of Monastir University of Monastir

The fast development and the rapid spread of information technology have raised the issue of digitalimage copyright protection, which was mostly addressed through robust watermarking. To ensure the survival of the watermark after attacks, most works have been making use of an additional step at the embedding phase,and by so making the scheme unsuitable for real-time implementation. However, to be effective and secure, it is recommended to combine the watermarking algorithm and the capture sensor in one device. In this paper, we brought the extra stage to the detection side. We firstly studied the effect of some signal processing operations on a watermarked image, then we proposed a general model for watermark extraction whose parameters were determined using the artificial bee colony. The efficacy of the proposed method was validated by comparing its robustness with two state-of-art schemes focusing on the watermark extraction.

关键词： Robust watermarking Artificial bee colony(ABC) Adaptive extraction

Monitoring of hepatocellular carcinoma

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World Journal of Gastroenterology 2024年第8期30卷 991-993页

作者： Imen Akkari Hanen Jaziri Department of Gastroenterology University Hospital of HachedUniversity of SousseFaculty of Medicine of SousseSousse 4000Tunisia Department of Gastroenterology University Hospital of SahloulUniversity of SousseFaculty of Medicine of SousseSousse 4054Tunisia

Screening for hepatocellular carcinoma in patients at risk is an evidence-based approach;however,adherence to the monitoring protocol recommended by international guidelines is ***,there is a need to use the best scre... 详细信息

关键词： Hepatocellular carcinoma Cirrhosis Risk factors Surveillance Imaging Diagnosis

Couple stress and Darcy Forchheimer hybrid nanofluid flow on a vertical plate by means of double diffusion Cattaneo-Christov analysis

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Chinese Physics B 2023年第4期32卷 142-150页

作者： Hamdi Ayed Department of Civil Engineering College of EngineeringKing Khalid UniversityAbha 61421Kingdom of Saudi Arabia Higher Institute of Transport and Logistics of sousse University of SousseSousse 4023Tunisia

A three-dimensional Darcy Forchheimer mixed convective flow of a couple stress hybrid nanofluid flow through a vertical plate by means of the double diffusion Cattaneo-Christov model is presented in this *** influence of highorder velocity slip flow,as well as a passive and active control,is also *** motive of the research is to develop a computational model,using cobalt ferrite(Co Fe_(2)O_(4))and copper(Cu)nanoparticles(NPs)in the carrier fluid water,to magnify the energy and mass communication rate and boost the efficiency and performance of thermal energy conduction for a variety of commercial and biological *** proposed model becomes more significant,with an additional effect of non-Fick's mass flux and Fourier's heat model to report the energy and mass passage *** results are obtained through the computational strategy parametric continuation *** figures are plotted to reveal the physical sketch of the obtained solution,while the statistical assessment has been evaluated through *** has been observed that the dispersion of Cu and Co Fe_(2)O_(4)NPs to the base fluid significantly enhances the velocity and thermal conductivity of water,which is the most remarkable property of these NPs from the industrial point of view.

关键词： hybrid nanofluid high order slip couple stress fluid non-Fourier's heat and mass flux Darcy Forchheimer effect

Cable-Driven Parallel Robot Workspace Identification and Optimal Design Based on the Upper Limb Functional Rehabilitation

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Journal of Bionic Engineering 2022年第2期19卷 390-402页

作者： Ferdaws Ennaiem Abdelbadia Chaker Juan Sandoval Sami Bennour Abdelfattah Mlika Lotfi Romdhane Said Zeghloul Med Amine Laribi Department of GMSC Pprime Institute CNRSENSMAUniversity of PoitiersUPR 3346PoitiersFrance Mechanical Laboratory of sousse(LMS) National Engineering School of SousseUniversity of Sousse4000 SousseTunisia American university of Sharjah PO Box 26666SharjahUnited Arab Emirates

An assessment of the human motion repeatability for three selected Activities of Daily Living(ADL)is performed in this *** exercises were prescribed by an occupational therapist for the upper limb *** movement patterns of five participants,recorded using a Qualisys motion capture system,are compared based on the Analysis of Variance(ANOVA)*** survey is motivated by the need to find the appropriate task workspace of a 6-degrees of freedom cable-driven parallel robot for upper limb rehabilitation,which is able to reproduce the three selected *** comparison is performed to justify,whether or not,there is enough similarity between the participants’gestures,and so a single reference trajectory can be adopted as the robot-prescribed *** the results of the comparative study,an optimization process of the sought robot design is carried out,where the structure size and the cable tensions simultaneously minimized.

关键词： Human motion repeatability Activities of Daily Living(ADL) Analysis of Variance(ANOVA) Task workspace Cable-driven parallel robot Upper limb rehabilitation Optimization

Design Study of a Cable-based Gait Training Machine

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Journal of Bionic Engineering 2017年第2期14卷 232-244页

作者： Houssein Lamine Med Amine Laribi Sami Bennour Lotfi Romdhane Said Zeghloul Mechanical Laboratory of sousse (LMS) National Engineering School of Sousse University of Sousse Sousse 4000 Tunisia Department of GMSC Pprime Institute CNRS ENSMA University of Poitiers UPR 3346 France Mechanical Engineering Department American University of Sharjah PO Box 26666 Sharjah United Arab Emirates

This paper deals with a design approach of a gait training machine based on a quantitative gait analysis. The proposed training machine is composed of a body weight support device and a cable-driven parallel robot. This paper is focused on the cable-driven robot, which controls the pose of the lower limb through an orthosis placed on the patient＇s leg. The cable robot reproduces a normal gait movement through the motion of the orthosis. A motion capture system is used to perform the quantitative analysis of a normal gait, which will be used as an input to the inverse dynamic model of the cable robot. By means of an optimization algorithm, the optimal design parameters, which minimize the tensions in the cables, are determined. Two constraints are considered, i.e., a non-negative tension in the cables at all times, and a free cable/end-effector collision. Once the optimal solution is computed, a power analysis is carried out in order to size the robot actuators. The proposed approach can be easily extended for the design study of a similar type of cable robots.

关键词： gait rehabilitation cable-driven robots body weight support system design optimization

Stabilizing periodic orbits of Chua’s system using adaptive fuzzy sliding mode controller

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International Journal of Intelligent Computing and Cybernetics 2019年第1期12卷 102-126页

作者： Hanène Medhaffar Moez Feki Nabil Derbel CEMLab ENISUniversity of SfaxSfaxTunisia ESSTHS University of SousseSousseTunisia

Purpose–The purpose of this paper is to investigate the stabilization of unstable periodic orbits of Chua’s system using adaptive fuzzy sliding mode controllers with moving ***/methodology/approach–For this aim,the sliding mode controller and fuzzy systems are combined to achieve the ***,the authors propose a moving sliding surface to improve robustness against uncertainties during the reaching phase,parameter variations and extraneous ***–Afterward,the authors design a sliding observer to estimate the unmeasurable states which are used in the previously designed ***/value–Numerical results are provided to show the effectiveness and robustness of the proposed method.

关键词： Sliding mode control Sliding mode observer Chaos control Fuzzy adaptive systems,Moving sliding surface

Natural Convection in a Horizontal Cylinder with Partial Heating: Energy Efficiency Analysis

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Journal of Thermal Science 2020年第6期29卷 1531-1550页

作者： MAZGAR Akram JARRAY Khouloud HAJJI Fadhila BEN NEJMA Faycal The Higher Institute of Applied Sciences and Technology of sousse University of SousseTunisia-Ibn Khaldun StreetTaffala City4003 SousseTunisia The Preparatory Institute for Engineering Studies of Monastir University of MonastirTunisia-Rue Ibn El Jazzar5019 MonastirTunisia

The current study reports a numerical analysis of free convection of air in an isothermal horizontal cylinder,cooled and heated at different wall *** heater sizes are discussed in this *** first heated zone is spread across one-quarter of the sidewall;the second is uniformly distributed over the half of the wall and the third active wall covers three-quarters of the *** various locations are considered and examined for each active zone of the *** computation is carried out for Rayleigh number ranging from 102 to *** results characterizing heat transfer and flow features are achieved using an iterative model developed in COMSOL *** effect of Rayleigh number on heat transfer and fluid flow characteristics within the cavity are *** attention is paid to the influence of heater location and heater size on energy *** is found that the mean Nusselt number and dimensionless velocity increase when increasing the Rayleigh ***,the optimal level of energy efficiency is achieved if the heating zone is centered at the upper part of the cylinder,regardless of the heater *** is also shown that the optimal configuration providing higher energy efficiency is obtained when three-quarters of the sidewall are locally heated,and more precisely,if the active zone is centered at the top of the cylinder.

关键词： natural convection cylinder partial heating energy efficiency Rayleigh number

Effects of Cationic Surfactant on Fresh and Hardened Properties of Cement-Based Mortar

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Journal of Renewable Materials 2023年第5期11卷 2345-2365页

作者： Soumaya Zormati Fadhel Aloulou Habib Sammouda Laboratory of Energy and Materials LabEM-LR11ES34University of SousseSousseTunisia

The objective of this study is to analyze the effects of using surfactant(CTAB)and cellulose nanofibers(NFC)as an admixture in cement *** examined composite properties as porosity,compression energy,thermal conductivity and *** results showed that with the addition of 0.7%by weight of NFC per emulsion in the presence of a cationic surfactant(CTAB).The new material produced presented a dry porosity between 4.7%and 4.4%,compressive strength between 9.8 and 22.9 MPa,and thermal conductivity between 0.95 and 2.25 W·m^(−1)·K^(−1).Thus we show better mechanical and thermal performance than that traditional Portland cement mortar with a density *** addition,the mortar made by emulsion of ordinary portland cement,cellulose nanofiber and organophilic clay(OC)treated with cetyltrimethylammonium bromide(CTAB)obtained has good resistance under high temperature and water,as well as excellent thermal insulation performance under high temperature and humidity *** study verified that the presence of NFC promotes hydration,leading to the production of more calcium silicate and portlandite gel.

关键词： Cement nanofiber cellulose organophile-clay thermal conductivity hydration surfactant compressive strength mortar

Bio-PCM Panels Composed of Renewable Materials Interact with Solar Heating Systems for Building Thermal Insulation

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Journal of Renewable Materials 2024年第4期12卷 771-798页

作者： Yosr Laatiri Habib Sammouda Fadhel Aloulou Laboratory of Energy and Materials:LabEM-LR11ES34 University of SousseHammam SousseTunisia

This article aims to present the feasibility of storing thermal energy in buildings for solar water heating while maintaining the comfort environment for residential *** contribution is the creation of insulating composite panels made of bio-based phase change materials(bio-PCM is all from coconut oil),cement and renewable materials(treated wood fiber and organic clay).The inclusion of wood fibers improved the thermal properties;a simple 2%increase of wood fiber decreased the heat conductivity by approximately 23.42%.The issues of bio-PCM leakage in the cement mortar and a roughly 56.5%reduction in thermal conductivity with bio-PCM stability in composite panels can be resolved by treating wood fibers with an adjuvant by impregnating them in bio-PCM in the presence of the treated clay *** and wood fiber were treated with adjuvants that are both biological and environmentally acceptable,as confirmed by FTIR *** heat transfer bench(DIDATEK)showed a decrease in thermal *** using differential scanning calorimetric(DSC)analysis,the investigation of thermal stability and enthalpy during two heating cycles of pure bio-PCM and composite bio-PCM was *** novel renewable material was used to create composite panels for the trial prototype,which took the shape of a component attached to the solar heating system,33.57%less heat was lost,according to the heat transfer *** outcomes demonstrated the possibility of replacing traditional electric water heating in residential buildings with solar water heating systems.

关键词： Cement wood fiber PCM thermal conductivity thermal insulation solar energy