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SIMAD:Secure Intelligent Method for IoT-Fog Environments Attacks Detection

Computers, Materials & Continua 2022年第2期70卷 2727-2742页

作者： Wided ben Daoud Sami Mahfoudhi NTS’Com Research Unit SfaxTunisia Department of MIS CBEQassim UniversityBuraidahAl QassimKSA

The Internet of Thing IoT paradigm has emerged in numerous domains and it has achieved an exponential ***,alongside this advancement,IoT networks are facing an ever-increasing rate of security risks because of the continuous and rapid changes in network *** order to overcome these security challenges,the fog system has delivered a powerful environment that provides additional resources for a more improved data ***,because of the emerging of various breaches,several attacks are ceaselessly emerging in IoT and Fog ***,the new emerging applications in IoT-Fog environment still require novel,distributed,and intelligent security models,controls,and *** addition,the ever-evolving hacking techniques and methods and the expanded risks surfaces have demonstrated the importance of attacks detection *** proves that even advanced solutions face difficulties in discovering and recognizing these small variations of *** fact,to address the above problems,Artificial Intelligence(AI)methods could be applied on the millions of terabytes of collected information to enhance and optimize the processes of IoT and fog *** this respect,this research is designed to adopt a new security scheme supported by an advanced machine learning algorithm to ensure an intelligent distributed attacks detection and a monitoring process that detects malicious attacks and updates threats signature databases in IoTFog *** evaluated the performance of our distributed approach with the application of certain machine *** experiments show that the proposed scheme,applied with the Random Forest(RF)is more efficient and provides better accuracy(99.50%),better scalability,and lower false alert *** this regard,the distribution character of our method brings about faster detection and better learning.

关键词： Attack detection Fog IoT network machine learning distributed mechanism

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The Heat Equation for the Dirichlet Fractional Laplacian with Negative Potentials:Existence and Blow-up of Nonnegative Solutions

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Acta Mathematica Sinica,English Series 2017年第7期33卷 981-995页

作者： Ali ben AMOR Tarek KENZIZI Department of Mathematics Faculty of Sciences of GabèsUniversity GabèsGabès 6072Tunisia Department of Mathematics Faculty of Sciences of TunisUniversity Tunis EIManarTunis 1001Tunisia

We establish conditions ensuring either existence or blow-up of nonnegative solutions for the heat equation generated by the Dirichlet fractional Laplacian perturbed by negative potentials on bounded sets. The elabora... 详细信息

关键词： Fractional Laplacian heat equation Dirichlet form blow-up

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 16-21页

作者： YANG Fan LI Dao-ben School of Information Engineering Beijing University of Posts andTelecommunications Beijing 100876 China

A more accurate correlated multiple input and multiple output （MIMO） channel model for IEEE 802.16n is presented. On one hand, this MIMO channel model can obtain more precise antenna correlation, which is a key character for MIMO channel and important for the research of IEEE 802.16n and MIMO technologies. On the other hand, it maintains a low complexity of simulation.

关键词： MIMO channel model power delay profile antenna correlation

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Automatic Classification of Superimposed Modulations for 5G MIMO Two-Way Cognitive Relay Networks

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Computers, Materials & Continua 2022年第1期70卷 1799-1814页

作者： Haithem ben Chikha Ahmad Almadhor Jouf University College of Computer and Information SciencesComputer Engineering and Networks DepartmentSakaka72388Kingdom of Saudi Arabia

To promote reliable and secure communications in the cognitive radio network,the automatic modulation classification algorithms have been mainly proposed to estimate a single *** this paper,we address the classification of superimposed modulations dedicated to 5G multipleinput multiple-output(MIMO)two-way cognitive relay network in realistic channels modeled with Nakagami-m *** purpose consists of classifying pairs of users modulations from superimposed *** achieve this goal,we apply the higher-order statistics in conjunction with the Multi-BoostAB *** use several efficiency metrics including the true positive(TP)rate,false positive(FP)rate,precision,recall,F-Measure and receiver operating characteristic(ROC)area in order to evaluate the performance of the proposed algorithm in terms of correct superimposed modulations *** simulations prove that our proposal allows obtaining a good probability of classification for ten superimposed modulations at a low signal-to-noise ratio,including the worst case(i.e.,m=0.5),where the fading distribution follows a one-sided Gaussian *** also carry out a comparative study between our proposal usingMultiBoostAB classifier with the decision tree(J48)*** results show that the performance of MultiBoostAB on the superimposed modulations classifications outperforms the one of J48 *** addition,we study the impact of the symbols number,path loss exponent and relay position on the performance of the proposed automatic classification superimposed modulations in terms of probability of correct classification.

关键词： Automatic classification MIMO two-way cognitive relay network Nakagami-m channels superimposed modulations 5G

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Overlapped frequency-time division multiplexing

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The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 8-13页

作者： JIANG Hui LI Dao-ben School of Information Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

A technique named overlapped frequency-time division multiplexing （OVFTDM）） is proposed in this article. The technique is derived from Nyquist system and frequency-time division multiplexing system. When the signals are compactly overlapped without the orthogonality in time domain, the technique is named overlapped time division multiplexing （OVTDM）, whereas when signals are compactly overlapped without the orthogonality in frequency domain, the technique is called overlapped frequency division multiplexing （OVFDM）. To further improve spectral efficiency, the OVFTDM in which signals are overlapped both in frequency domain and in time domain is explored. OVFTDM does not depend on orthogonality whatever in time domain or in frequency domain like Nyquist system or OFDM system, but on the convolutional constraint relationship among signals. Therefore, not only the spectral efficiency but also the reliability is improved. The simulations verify the validity of this theory.

关键词： overlap OVFTDM spectral efficiency

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Towards a Unified Recurrent Neural Network Theory： The Uniformly Pseudo-Projection-Anti-Monotone Net

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Acta Mathematica Sinica,English Series 2011年第2期27卷 377-396页

作者： Zong ben XU Chen QIAO Institute for Information and System Science Faculty of Science MOE Key Lab for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an 710049 P. R. China qiaochen @mail.xjtu. edu. cn

In the past decades, various neural network models have been developed for modeling the behavior of human brain or performing problem-solving through simulating the behavior of human brain. The recurrent neural networks are the type of neural networks to model or simulate associative memory behavior of human being. A recurrent neural network （RNN） can be generally formalized as a dynamic system associated with two fundamental operators： one is the nonlinear activation operator deduced from the input-output properties of the involved neurons, and the other is the synaptic connections （a matrix） among the neurons. Through carefully examining properties of various activation functions used, we introduce a novel type of monotone operators, the uniformly pseudo-projectionanti-monotone （UPPAM） operators, to unify the various RNN models appeared in the literature. We develop a unified encoding and stability theory for the UPPAM network model when the time is discrete. The established model and theory not only unify but also jointly generalize the most known results of RNNs. The approach has lunched a visible step towards establishment of a unified mathematical theory of recurrent neural networks.

关键词： Feedback neural networks essential characteristics uniformly pseudo-projection-anti- monotone net unified theory dynamics

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Lymphoid tyrosine phosphatase R620W variant and inflammatory bowel disease in Tunisia

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World Journal of Gastroenterology 2010年第4期16卷 479-483页

作者： Imen Sfar Walid ben Aleya Leila Mouelhi Houda Aouadi Thouraya ben Rhomdhane Mouna Makhlouf Salwa Ayed-Jendoubi Houda Gargaoui Taoufik Najjar Taieb ben abdallah Khaled Ayed Yousr Gorgi Laboratory of Immunology Charles Nicolle HospitalTunis 1006Tunisia Department of Gastroenterology Charles Nicolle HospitalTunis 1006Tunisia

AIM:To assess the possible association between PTPN22(R620W) gene polymorphism and inflammatory bowel disease(IBD).METHODS:One hundred and sixty-four patients with IBD 105 Crohn's disease(CD) and 59 ulcerative colitis(UC) and 100 healthy controls were *** of the PTPN22 gene 1858C→T polymorphism was performed by restriction fragment length polymorphism-polymerase chain reaction with Rsa Ⅰ ***:The genotypic and allelic frequencies of(R620W) PTPN22 gene polymorphism reveal a significant association of the PTPN22 620-W allele with IBD,compared to the healthy control group(OR:17.81,95% CI:4.18-21.86,P = 0.00001).Nevertheless,nodifference in this polymorphism was found between CD and UC *** significant association was found between the frequencies of genotypes of the PTPN22 gene with either the clinical features such as sex,age,age at disease onset,and extent of colitis,or the production of serological markers(anti-Saccharomyces cerevisiae antibody in CD and perinuclear anti-neutrophil cytoplasmic antibody in UC).CONCLUSION:These observations confirm the association of IBD susceptibility with the PTPN22 1858T(620-W) allele in Tunisian patients.

关键词： Inflammatory bowel disease PTPN22 Genetic polymorphism Genetic susceptibility

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Weinstein–Sobolev Spaces of Exponential Type and Applications

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Acta Mathematica Sinica,English Series 2013年第3期29卷 591-608页

作者： Hassen ben MOHAMED Belgacem GHRIBI Department of Mathematics Faculty of Sciences of Gabs

In this paper, we introduce and study the Sobolev spaces of exponential type associated with the Weinstein operator, via some elements of harmonic analysis related to this operator. In particular, some properties, including completeness and imbedding theorem, are proved. Finally, using the theory of reproducing kernels, some applications are given for these spaces.

关键词： Weinstein operator Weinstein transform distribution Sobolev spaces

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A seropositive nodular rheumatoid polyarthritis without arthritis, does it exist?

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Open Journal of Internal Medicine 2013年第2期3卷 70-72页

作者： ben Fredj Ismail Fatma Rezgui Amel Karmani Monia ben abdallah Olfa Azzebi Samira Laouani Kechrid Chedia Department of Internal Medicine Sahloul Hospital Sousse Tunisia

Introduction: The rheumatoid polyarthritis is the most frequent chronic polyarthritis. It affects essentially woman between 40 and 60 years old. Rheumatic subcutaneous nodules and tenosynovitis are usually associated with seropositive symptomatic rheumatoid polyarthritis. However, it is rare that they constitute the essential clinical expression of the disease. Case report: A 60-year-old woman was hospitalized for tumefaction of the dorsal face of the right hand evolved two months before. The clinical examination was found isolated subcutaneous nodules. The anatomopathological exam of one nodule ended in its rheumatoid origin and the MRI of a second one confirmed a tenosynovitis. Anti-CCP antibodies were positive. The patient has never suffered from arthralgias. The evolution was favourable under corticosteroid therapy, methotrexate and colchicine. Discussion: Rheumatic subcutaneous nodules and tenosynovitis are usually associated with seropositive symptomatic rheumatoid polyarthritis. It is rare that they constitute the essential clinical expression of the disease. Conclusion: The extra-articular appearances of the rheumatoid polyarthritis must not be underestimated especially since they can constitute—even rarely—the essential clinical expression of the disease.

关键词： Rheumatoid Polyarthritis Rheumatoid nodules Seropositive Tenosynovitis

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Approaches for Evaluating the Groundwater Suitability for Domestic and Agricultural Uses in Guenniche Plain, Northern Tunisia

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Journal of Hydraulic Engineering 2016年第1期2卷 38-51页

作者： Jamila Hammami Lamia Kouzana Boutheina Farhat abdallah ben Mammou Maarten Waterloo Dhafer Ghabri Faculty of Sciences of Tunis University of Tunis El Manar 2092 Tunis Tunisia Acacia Water van Hoogendorpplein 4 2805 BM Gouda The Netherlands Regional Commission for Agricultural Development Av. Hassen Nouri Bizerte 7000 Tunisia

In add and semi-add regions groundwater is often the only natural resource for water supply. Suitability of groundwater for domestic and irrigation purposes as well as its hydrochemical characteristics was estimated in the aquifer of Guenniche plain in Northern Tunisia. Samples, collected in March and July 2007, were analysed for a range of chemical parameters （pH, conductivity, TDS, calcium, magnesium, sodium, potassium, sulphate, chloride, carbonate and bicarbonate）. The mean concentration of cations （mg.L-~） indicated that Na＋〉 Ca2＋〉 Mg2＋〉 K＋. Similarly, the mean concentration of anions （mg.L-1） displayed the following decreasing trend： Cl-〉 SO42〉 HCO3〉 CO32-. A comparison of groundwater quality parameters in relation to specified limits for drinking water showed that the concentrations of EC, TDS, Ca2＋, Na＋, Cl-, SO42 and total hardness exceeded the desirable limits in many water samples. Majority of the samples were not suitable for drinking purposes. Furthermore, suitability of groundwater for irrigation was evaluated based on sodium absorption ratio, sodium percent, permeability index, residual sodium carbonate, magnesium hazard and Kelly＇s ratio. All these quality parameters revealed that the groundwater is of good to suitable category for irrigation.

关键词： Guenniche plain Tunisia suitability drinking use irrigation.

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