Faculté des Sciences

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A New Information-Based Heuristic for Distributed DDoS Detection and Mitigation: Distributed and Collaborative DDoS Detection
(International Journal of Organizational and Collective Intelligence Volume 12 • Issue 4, 2022) Nafir , Abdenacer; Mazouzi , Smaine; Chikhi ,Salim
In this paper a novel collective method for DDoS detection is introduced. The method is distributed and implemented as a multi-agent system, and where local decision is based on an informationbased heuristic, namely the entropy. According the calculated entropy a router exchange data with its neighbors aiming at collectively decide if a DDoS is ongoing or not. Most of the works of the literature that are based on the entropy they have used source addresses. The authors’ method is based on the entropy of the distances traveled by the packets, so spoofing IP packets will be hard to perform by hackers. Each router combines its decision with those of its neighbors. Such a collective detection allows to apply defense against the attack despite the victim is out of service or cannot perform DDoS mitigation because the traffic is congested in its neighborhood. Conducted experiments using the platform OMNet++ show the potential of the new method for efficient collaborative and distributed detection and mitigation of DDoS attacks.
Ecological study for groups of citrus weeds in the Skikda region, Algeria
(Journal of Research in Weed Science 2 (2019) 216-223, 2019-03-16) Hannachi , Abdelhakim
The study of citrus weeds in the Skikda region during the 2017/2018 crop year included 40 phytoecological surveys of different crops. They were distributed throughout the study area in order to take into account the variability of ecological and Agronomic factors. The results obtained by the Correspondence Factor Analysis (CFA) highlight two groups of surveys including two groups of species. These results explain the distribution of citrus weeds in the Skikda region according to climate and edaphic conditions. The appearance of weed species was selective, for example, Oxalis Latifolia. Kunt. is a very common and abundant species in the more or less humid northern zone, whereas it is almost absent in the southern zone of the study area. On the other hand, Papaver rhoeas. was frequent and abundant in the southern zone, which is a somewhat dry zone, was almost absent in the northern zone.
Effect of Marble Powder and Dolomite on the Mechanical Properties and the Thermal Stability of Poly(vinyl chloride)
(Asian Journal of Chemistry Vol. 22, No. 9, 6687-6692, 2010) ZAGHDOUDI , Rachida; BOUNAMOUS , Ghada; MEGHEZZI , Ahmed; DJAZI , Faycal
The polymers are materials whose proprieties can be improved by adding various additives such as the fillers which can be mineral or organic compounds. In this study, we are interested in the possibility of improving the mechanical proprieties and the thermal stability of poly(vinyl chloride) (PVC) by adding local mineral fillers i.e., powder of marble and the dolomite. The composites PVC/dolomite and PVC/ marble (fillers: 0, 5, 10, 15 and 20 phr) have been prepared. The test- tubes have been made up of the different composites through three stages i.e., blending, pressing and cutting up. These test-tubes have been then put under mechanical tests (tensile test and impact IZOD) and a thermo test (Vicat softening temperatures) whereas, the thermo stability of various components has been evaluated by the dehydrochlorination. The results have shown that there is a notable improvement of mechanical and thermo proprieties which is interpreted by the increase of the Vicat softening temperatures and an extension of stability time.
Existence and uniqueness of the weak solution for Keller-Segel model coupled with Boussinesq equations
(Demonstratio Mathematica 2021; 54: 558–575, 2021) Lamine Bouzettouta; Amar Guesmia; Slimani , Ali
Keller-Segel chemotaxis model is described by a system of nonlinear partial differential equations: a convection diffusion equation for the cell density coupled with a reaction-diffusion equation for chemoattractant concentration. In this work, we study the phenomenon of Keller-Segel model coupled with Boussinesq equations. The main objective of this work is to study the global existence and uniqueness and boundedness of the weak solution for the problem, which is carried out by the Galerkin method
Existence, uniqueness and stability of solutions to a delay hematopoiesis model
(Journal of Innovative Applied Mathematics and Computational Sciences , 2(2) , 23–30, 2022) Bouakkaz , Ahlème; Khemis , Rabah
This work aims to investigate a delay hematopoiesis model where the delay depends on both the time and the current density of mature blood cells. Based on the Banach contraction principle, the Schauder’s fixed point theorem and some properties of a Green’s function, we establish several interesting existence and uniqueness results of positive periodic solutions for the proposed model. The derived results are new and generalize some previous studies. Keywords: Fixed point theorem, Green’s function, Mackey–Glass equation, Periodic solution, Positive solution.
Existence, uniqueness and stability results of an iterative survival model of red blood cells with a delayed nonlinear harvesting term
(Journal of Mathematical Modeling Vol. 10, No. 3, pp. 515-528, 2022) Khemis , Marwa ; Bouakkaz , Ahlème; Khemis , Rabah
In this article, a first-order iterative Lasota–Wazewska model with a nonlinear delayed harvesting term is discussed. Some sufficient conditions are derived for proving the existence, uniqueness and continuous dependence on parameters of positive periodic solutions with the help of Krasnoselskii’s and Banach fixed point theorems along with the Green’s functions method. Besides, at the end of this work, three examples are provided to show the accuracy of the conditions of our theoretical findings which are completely innovative and complementary to some earlier publications in the literature
EXPONENTIAL STABILITY FOR A NONLINEAR TIMOSHENKO SYSTEM WITH DISTRIBUTED DELAY
(International Journal of Analysis and Applications Volume 19, Number 1 , 77-90, 2021) BOUZETTOUTA , Lamine; HEBHOUB , Fahima ; GHENNAM , Karima; BENFERDI , Sabrina
This paper is concerned with a nonlinear Timoshenko system modeling clamped thin elastic beams with distributed delay time. The distributed delay is de ned on feedback term associated to the equation for rotation angle. Under suitable assumptions on the data, we establish the exponential stability of the system under the usual equal wave speeds assumption.
National food safety depends on the modernization and mechanization of agriculture
(INTERNATIONAL JOURNAL OF SCIENCES AND NATURAL RESOURCES (IJSNR) NUMBER 1 JUNE , 2022) Foufou , Ammar
Since independence, Algeria's economy has relied on the hydrocarbons sector, which represents 98% of the population. This has caused all economic indicators and national policies, whether development or related to the state budget, to be anchored directly to the figures for the export of gas and oil. Algeria has been unable, for more than half a century, to establish a diversified and affluent economy, in light of the dominance of the container economy, which is not immune from external crises and the requirements of the international market. Algeria is distinguished from the countries of the Mediterranean basin by its vast area, the diversity of its climate and environmental systems, and its unique geographical structure. This has made its space characterized by four climatic systems, from the Mediterranean in the north to the coastal climate in the far south. Climate diversity is logically related to the diversity of resources, ecosystems and agricultural products throughout the year. These natural advantages also allowed some products to be impersonated twice a year. All scientific experiments and economic approaches have reached the inevitable conclusion that we must modernize the agricultural sector through modernizing its structures, modernizing its production factors, and, in particular, introducing modern technology into all stages of the agricultural production process in its various divisions and specializations, and in various climatic regions.
National Symposium on “Chromatography in bio-Medical and Pharmaceutical research : advanced Techniques and Applications” (NSCBPR-2024)
(Faculty of Science, 2024-05-09&08)
The national symposium on “Chromatography in Bio-Medical and Pharmaceutical Research: Advanced Techniques and Applications” (NSCBPR-2024) was taken place in hybrid mode, in May 08&09th, 2024 at Skikda University, Algeria Scientific research usually aims to transfer the best knowledge from academia to industry and then to the commercial sector. Pharmaceutical and biomedical fields as well pharmacy are interdependent but complement each other in various ways. To achieve this, the success of such transition and accompaniment must be ensured through all available channels. Currently, fundamental findings of advanced techniques of separation and chromatography as research tool provide a strong platform for many pharmaceutical and biomedical applications in health media and industry. To boost up this incorporation, chromatographic research and its related technologies including methodologies and strategies of recent innovations must be transfer to the next generation in order to have an impact and to bring effective changes in various fields such as public health, the environment, industry and others. This has led to sharing research techniques, experiences and skills in scientific meetings. It could be the best way to achieve this objective and it can solve many problems and challenges in all scientific areas.. Hence, this scientific event of NSCBPR-2024 organized by the Department of Chemistry, Skikda University, is an emanation of such reflection and will cover the various subjects related to advanced techniques and applications of chromatography in bio-medical and pharmaceutical research. Leading scientists and researchers will share their recent progress and stimulate discussions on their research activities. The organizing committee also encourages socio-economic companies to present their problems likely to be solved by researchers.
New results on periodic solutions for a nonlinear fourth-order iterative differential equation
(Journal of Prime Research in Mathematics, 18(2) , 88–99, 2022) Khemis , Rabah; Bouakkaz , Ahlème
The key task of this paper is to investigate a nonlinear fourth-order delay differential equation. By virtue of the fixed point theory and the Green’s functions method, we establish some new results on the existence, uniqueness and continuous dependence on parameters of periodic solutions. In addition, an example is given to corroborate the validity of our main results. Up to now, no work has been carried out on this topic. So, the findings of this paper are new and complement the available works in the literature to some degree.
Positive periodic solutions for a class of second-order differential equations with state-dependent delays
(Turkish Journal of Mathematics , 1412 – 1426, 2020) BOUAKKAZ , Ahlème; KHEMIS , Rabah
In this paper, we consider a class of second order differential equations with iterative source term. The main results are obtained by virtue of a Krasnoselskii fixed point theorem and some useful properties of a Green’s function which allows us to prove the existence of positive periodic solutions. Finally, an example is included to illustrate the correctness of our results.
Self-Adaptation Through Reinforcement Learning Using a Feature Model
(International Journal of Organizational and Collective Intelligence Volume 12 • Issue 4, 2022) Boulehouache , Soufiane; Mazouzi , Smaine; Ouareth , Selma
Typically, self-adaptation is achieved by implementing the MAPE-K Control Loop. The researchers agree that multiple control loops should be assigned if the system is complex and large-scale. The hierarchical control has proven to be a good compromise to achieve SAS goals, as there is always some degree of decentralization but it also retains a degree of centralization. The decentralized entities must be coordinated to ensure the consistency of adaptation processes. The high cost of data transfer between coordinating entities may be an obstacle to achieving system scalability. To resolve this problem, coordination should only define between entities that require communication between them. However, most of the current SAS relies on static MAPE-K. In this article, authors present a new method that allows changing the structure and behavior of loops. Authors base on exploration strategies for online reinforcement learning, using the feature model to define the adaptation space.
The Development of Mountain Agriculture in the wilaya of Skikda (eastern Algeria) Facing New Legal Framework. "Program Evaluation in Action and Future Prospects".
(International Journal of Advanced Research , Volume 3, Issue 5, 824-834, 2015-05) Foufou , Ammar
The development of mountain agriculture in Algeria is closely related to the presence and involvement of Man as a key player who, under duress, abandoned his land situated in mountainous and rural areas. One of the key objectives of the public authorities is essentially based on the possibility of maintaining agricultural activities in mountain areas, all in does not dissociating the rural population, considered as the real engine of any rural development. Agricultural land in these areas, often "private" property and "arch" is hampered by a number of endogenous constraints in the image of excessive inheritance and fragmentation of land generation to generation. Therefore, the agricultural area exploited in these areas is seen to decline, on the one hand, and new agricultural investors targeting these areas are struggling to realize their projects fault of farmland on the other. This issue has created a strong demand for land in rural areas often located in forested areas. Therefore, a set of legal rules has emerged. This is the Executive Decree No. 01/87 from 05 April 2001 laying down the conditions and terms of use exemption under the provisions of Article 35 of Law No. 84-12 of June 23, 1984 amended and supplemented, establishing general forest regime, in particular Article 5. In the wilaya of Skikda, a program in this framework spanning 03 phases was initiated targeting mountainous municipalities to secure the population in these rural areas and extend as far as possible, their agricultural area farmed.
THE EXISTENCE OF PERIODIC SOLUTIONS OF A SECOND ORDER ITERATIVE DIFFERENTIAL EQUATION
(Acta Math. Univ. Comenianae Vol. XCII, 1 , pp. 9{22, 2023) KHEMIS ,R; BOUAKKAZ , A; CHOUAF , S
In this work, we consider a class of second order iterative di erential equations. Using Schauder's xed point theorem and the Green's functions method, the existence of periodic solutions is proved after establishing the equivalence of our problem with a certain integral equation. Finally, we end this article with a simple conclusion recapitulating the guiding idea of our approach. Obtained ndings complement some previous publications in the literature.
THE EXISTENCE RESULT OF RENORMALIZED SOLUTION FOR NONLINEAR PARABOLIC SYSTEM WITH VARIABLE EXPONENT AND L1 DATA
(International Journal of Analysis and Applications Volume 18, Number 5 , 748-773, 2020) SOUILAH , Fairouz; MAOUNI , Messaoud; SLIMANI , Kamel
In this paper, we prove the existence result of a renormalized solution to a class of nonlinear parabolic systems, which has a variable exponent Laplacian term and a Leary lions operator with data belong to L1.
TOPOLOGICAL DEGREE METHOD FOR FRACTIONAL LAPLACIAN SYSTEM
(Bulletin of Mathematical Analysis and Applications Volume 13 Issue 2, Pages10-19 , 2021) ABADA , Esma; LAKHAL , Hakim; MAOUNI , Messaoud
In this paper, we study the existence of weak solutions for a semilinear fractional elliptic system with Dirichlet boundary conditions. We apply the Leray-Schauder degree method in order to obtain a result about the existence of solutions.

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