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RPL-Based IoT Networks under Decreased Rank Attack:Performance Analysis in Static and Mobile Environments

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Computers, Materials & Continua 2024年第1期78卷 227-247页

作者： Amal Hkiri Mouna Karmani omar ben bahri Ahmed Mohammed Murayr Fawaz Hassan Alasmari Mohsen Machhout Physic Department Electronics and Micro-Electronics LaboratoryFaculty of Sciences of MonastirMonastir5000Tunisia Department of Science and Technology College of RanyahTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

The RPL(IPv6 Routing Protocol for Low-Power and Lossy Networks)protocol is essential for efficient communi-cation within the Internet of Things(IoT)*** its significance,RPL’s susceptibility to attacks remains a *** paper presents a comprehensive simulation-based analysis of the RPL protocol’s vulnerability to the decreased rank attack in both static andmobilenetwork *** employ the Random Direction Mobility Model(RDM)for mobile scenarios within the Cooja *** systematic evaluation focuses on critical performance metrics,including Packet Delivery Ratio(PDR),Average End to End Delay(AE2ED),throughput,Expected Transmission Count(ETX),and Average Power Consumption(APC).Our findings illuminate the disruptive impact of this attack on the routing hierarchy,resulting in decreased PDR and throughput,increased AE2ED,ETX,and *** results underscore the urgent need for robust security measures to protect RPL-based IoT ***,our study emphasizes the exacerbated impact of the attack in mobile scenarios,highlighting the evolving security requirements of IoT networks.

关键词： RPL decreased rank attacks mobility random direction model

Low-Cost IMU Sensors for Satellite Maturity Improvement

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Computer Systems Science & Engineering 2022年第12期43卷 1315-1326页

作者： omar ben bahri Abdullah Alhumaidi Alotaibi Department of Science and Technology College of RanyahTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

The satellite technology proves its impact in the modern era with itswide benefits and applications. However, the cost of the development in this fieldpresents gaps in many countries, almost the developed countries. Therefore, thispaper provides a rich platform around low-cost sensors in order to improve maturity in space technology, mostly the system of attitude determination and *** development of this knowledge turns out to be very interesting in order toachieve a space mission which leads to the progression of the spatial technologyreadiness level (TRL) defined by the international measurement scale which isable to estimate the technological maturity. Thus, the idea is carried out for thedevelopment of low-cost sensors’ system for attitude determination around anArduino board. A sensor fusion method was applied on three types of sensors:accelerometer, magnetometer, and gyroscope in order to detect the reliable orientation. It is aimed to apply quaternion based Kalman filter on different platformthan previous systems. It is succeeded therefore to improve measurementaccuracy around low-cost sensor to achieve the main goal of this paper.

关键词： ADS IMU sensors kalman filter low-cost satellite

Development of Pandemic Monitoring System Based on Constellation of Nanosatellites

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Computer Systems Science & Engineering 2023年第7期46卷 1249-1263页

作者： omar ben bahri Abdullah Alhumaidi Alotaibi Department of Science and Technology College of RanyahTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

Covid-19 is a global crisis and the greatest challenge we have *** affects people in different *** infected people develop a mild to moderate form of the disease and recover without *** presents a problem in spreading the pandemic with unintentionally ***,this paper provides a new technique for COVID-19 monitoring remotely and in wide *** system is based on satellite technology that provides a pivotal solution for wireless *** mission requires a data collection technique which can be based on drones’***,the main objective of our proposal is to develop a mission architecture around satellite technology in order to collect information in wide range,mostly,in areas suffer network coverage.A communication method was developed around a constellation of nanosatellites to cover Saudi Arabia region which is the area of interest in this *** new proposed architecture provided an efficient monitoring application discussing the gaps related to thermal imaging *** reached 15.8 min as mean duration of visibility for the desired *** total,the system can reach a coverage of 5.8 h/day,allowing to send about 21870 thermal images.

关键词： Antenna data transmission design network simulation wireless communication

Magnesium implant degradation provides immunomodulatory and proangiogenic effects and attenuates peri-implant fibrosis in soft tissues

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Bioactive Materials 2023年第8期26卷 353-369页

作者： Heithem ben Amara Diana C.Martinez Furqan A.Shah Anna Johansson Loo Lena Emanuelsson Birgitta Norlindh Regine Willumeit-Römer Tomasz Plocinski Wojciech Swieszkowski Anders Palmquist omar omar Peter Thomsen Department of Biomaterials Institute of Clinical SciencesSahlgrenska AcademyUniversity of GothenburgGothenburgSweden Biomaterials Group Materials Design DivisionFaculty of Materials Science and EngineeringWarsaw University of TechnologyWarsawPoland Institute of Metallic Biomaterials Helmholtz-Zentrum HereonGeesthachtGermany

Implants made of magnesium(Mg)are increasingly employed in patients to achieve osteosynthesis while degrading in *** Mg implants and Mg^(2+)have been suggested to possess anti-inflammatory properties,the clinically observed soft tissue inflammation around Mg implants is ***,using a rat soft tissue model and a 1-28 d observation period,we determined the temporo-spatial cell distribution and behavior in relation to sequential changes of pure Mg implant surface properties and Mg^(2+)*** to nondegradable titanium(Ti)implants,Mg degradation exacerbated initial *** of Mg degradation products at the tissue-implant interface,culminating at 3 d,actively initiated chemotaxis and upregulated mRNA and protein immunomodulatory markers,particularly inducible nitric oxide synthase and toll-like receptor-4 up to 6 d,yet without a cytotoxic *** vascularization was demonstrated morphologically,preceded by high expression of vascular endothelial growth *** transition to appropriate tissue repair coincided with implant surface enrichment of Ca and P and reduced peri-implant Mg^(2+)*** implants revealed a thinner fibrous encapsulation compared with *** detailed understanding of the relationship between Mg material properties and the spatial and time-resolved cellular processes provides a basis for the interpretation of clinical observations and future tailoring of Mg implants.

关键词： Magnesium Biodegradable implants Inflammation Foreign-body reaction Gene expression Neovascularization

A Systematic Design of Emulators for Multivariable Non Square and Nonlinear Systems

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International Journal of Automation and computing 2017年第6期14卷 742-754页

作者： Nesrine bahri Asma Atig Ridha ben Abdennour Fabrice Druaux Dimitri Lefebvre University of Gabes National School of Engineers of Gabes-TunisiaStreet Omar Ibn Khattab 6029Gabes University of Havre 25 Rue Philippe Lebon76600 Le HavreFrance

In this paper, multimodel and neural emulators are proposed for uncoupled multivariable nonlinear plants with unknown dynamics. The contributions of this paper are to extend the emulators to multivariable non square systems and to propose a systematic method to compute the multimodel synthesis parameters. The effectiveness of the proposed emulators is shown through two simulation examples. The obtained results are very satisfactory, they illustrate the performance of both emulators and show the advantages of the multimodel emulator relatively to the neural one.

关键词： Uncoupled multimodel neural networks emulation multivariable nonlinear systems parameters estimation

CRP Binding Kinetics Enhancement Using Local Narrowing into a bent Channel: Finite Element Analysis

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Engineering（科研） 2022年第1期14卷 62-75页

作者： Mohamed bahri Imen Dermoul Marshet Getaye Mohamed Amin Elaguech Khouloud Djebbi Mounir ben Ali Chaker Tlili Deqiang Wang Chongqing School University of Chinese Academy of Sciences Chongqing China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing China University of Chinese Academy of Sciences Beijing China Preparatory Institute for Engineering of Nabeul IPEIN University of Carthage Campus Universitaire Merazka Tunisia NANOMISENE Lab LR16CRMN01 Centre for Research on Microelectronics and Nanotechnology of Sousse Technopole of Sousse Sousse Tunisia University of Sousse Higher Institute of Applied Sciences and Technology of Sousse GREENS-ISSAT Cité Ettafala Sousse Tunisia

Binding kinetics enhancement of a microfluidic biosensor into a micro-channel through the application of a supplementary mechanism has received tremendous attention because of the obtained significant enhancement factor. However, biosensor’s performance enhancement using only simple channel engineering is still rarely realized. Herein, we present a novel design of a complex reactive protein (CRP) biosensor into a U-shaped channel with a sensitive membrane located in the middle of the bent zone. Various critical factors affecting the equilibrium binding time are numerically investigated. The turn geometry is then optimized when the arc length along the inner and outer radii is almost the same, which leads to locally minimizing the channel height overhead the reaction surface and improves the analyte transport towards the sensing area. The numerical studies reveal that applying a local narrowing above the reaction surface can notably enhance the trapping and the surface formation of complex antibody-antigen, thus upgrading the biosensor performance. This work puts a significant advance towards microfluidic channel engineering and the exploration of micro-flow injection experimental studies.

关键词： Finite Elements Method Binding Reaction CRP Biosensor Microfluidic System Microchannel Turn Numerical Simulation

Effects of 12 weeks of back-squat training program on jump performances and bone markers in female students

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TMR Non-Drug Therapy 2022年第3期5卷 35-40页

作者： Badiea Sharaif Nidhal Jebabli Saber Abdellaoui Jed Mohamed Tijani Jihen Khalfoun Mohanad omar Abderraouf ben Abderrahman Physical Education and Sport Sciences Department College of EducationSultan Qaboos UniversityAl-Khodh Muscat 123Sultanate of Oman Higher Institute of Sport and Physical Education of Ksar-Said University of ManoubaKsar-Said 2009Tunisia High Institute of Sport and Physical Education of Kef University of JendoubaUR13JS01Kef 7100Tunisia

Background:The training program promoted improvements of jump abilities throughout the musculoskeletal system including bone *** aim of this study is to examine both the acute and chronic response of bone markers to resistance training ***:Ten female students(age:18±0.7 years,body mass:63±3.6 kg;height:164±5.2 cm)participated in this *** were recruited for a back-squat training program for 12 weeks,two days/*** full-back squat protocol consisted of 3–5 sets×3–8 repetitions at 45–55%one repetition *** sessions included a 5 jump test(5JT),standing long jump(SLJ),drop jump(DJ),and vertical jump(VJ).Results:Substantial improvements in all testing jumps(5JT:∆10%;P=0.000;ES=1.72;SLJ:∆7%;P=0.000;ES=1.33;DJ:∆11%;P=0.000;ES=0.72;VJ:∆20%;P=0.000;ES=1.84)were found during post program in comparison to pre-program ***,a significant change(P≤0.05)of bone markers during post-exercise compared to pre-exercise either before or after the training *** collagen type I carboxy-terminal peptide(CICP)levels elevated after the training program(pre-exercise only)compared to former ***:12 weeks of back-squat training program resulted greater acute improvements of jump abilities with adaptation in all musculoskeletal system including bone formation.

关键词： strength training jump tests bone biochemical markers athletes

Association of hepatitis C virus infection and diabetes in central Tunisia

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World Journal of Gastroenterology 2009年第22期15卷 2778-2781页

作者： Naoufel Kaabia Elhem ben Jazia Ines Slim Imen Fodha Wissem Hachfi Rafika Gaha Mabrouk Khalifa Aoutef Hadj Kilani Halim Trabelsi Ahmed Abdelaziz Fethi bahri Amel Letaief Department of Internal Medicine and Infectious Disease Unit of Research:04/UR/08-21University Hospital Farhat Hached Microbiology Unit University Hospital Sahloul Epidemiology Unit University Hospital Farhat Hached Department of Medicine Msaken hospital

AIM:To investigate hepatitis C virus(HCV) seroprevalence in Tunisian patients with diabetes mellitus and in a control ***:A cross-sectional study was conducted to determine the HCV seroprevalence in 1269 patients with diabetes(452 male,817 female) and 1315 nondiabetic patients,attending health centers in Sousse,*** screening was performed in both groups using a fourth-generation enzyme ***:In the diabetic group,17(1.3%) were found to be HCV-infected compared with eight(0.6%) in the control group,although the difference was not significant(P=0.057).Quantitative PCR was performed in 20 *** patients were positive and showed HCV genotype 1b in all ***:Frequency of HCV antibodies was low in patients with diabetes and in the control group in central Tunisia,with no signifi cant difference between the groups.

关键词：丙型肝炎病毒病毒感染糖尿病突尼斯中央协会 PCR技术对照组

Management of Isolated Coronal Fractures of Distal Humeral Epiphysis by Herbert Screw

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Open Journal of Orthopedics 2023年第2期13卷 50-54页

作者： Yassine ben Bouzid Rida-Allah Bassir Monsef Boufettal Jalal Mekkaoui Mohamed Kharmaz Moulay omar Lamrani Mohamed Saleh Berrada Department of Orthopaedic and Traumatologic Surgery Ibn Sina University Hospital Rabat Morocco

Isolated fractures of the distal humerus are rare. Their diagnosis is often late, and treatment has progressed but serious complications may occur. We conducted a retrospective study of a series of 10 cases at the Department of Orthopedic and Traumatologic Surgery of the Ibn Sina University Hospital in Rabat over a 4-year period, from January 2018 to January 2022. All our cases were treated surgically with Herbert screws. The functional, clinical and radiological outcome was satisfactory with a return to pre-fracture activity in all patients.

关键词： Elbow Capitellum Herbert Screw