American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS)
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Implementation of Entropy-Based DDoS Attack Detection Method in Different SDN Topologies
Get PDFSoftware-Defined Network (SDN) brings a lot of advantages to the world of networking through its flexibility and centralized management, but this centralized control makes SDN susceptible to different types of attacks. The Distributed Denial of Service (DDoS) attack is one of the most commonly used attacks since it is relatively easy to deploy and very successful at harming any network, thus researchers are mostly focusing on this type to discover an effective defense mechanism against it. This work investigates the impact of a DDoS attack on an SDN environment and proposes a light and effective method for detecting this attack at an early stage based on calculating the entropy of destination network traffic IP addresses. The proposed method proved its ability to detect the DDoS attack with minimum detection time in three different SDN network topologies which are single, linear, and multi-controller. RYU controller has been used with Mininet emulator and OpenFlow protocol
Assessment of Disinfection Efficacy of Sodium Hypochlorite and Aloe Vera Gel for Potable Water Production from Multiple Water Sources
Get PDFThe importance of potable water for human survival cannot be understated, just as human body cannot carry out its functions without water. Oftentimes, chemical such as sodium hypochlorite is used to make contaminated water fit for human consumption but overuse of this chemical has its attendant health effects including carcinogenic effect. It is therefore, important to find a substitute for sodium hypochlorite, without attendant health effects, for water disinfection purpose. The aim of this study was to evaluate and compare the antimicrobial effects of sodium hypochlorite (NaOCl) and aloe vera gel, stored under various conditions and parameters, on coliform and Escherichia coli isolates from some water samples. Four water samples including tap water, well water, oil polluted water and leachate were collected across Lagos State, Nigeria. All water samples were subjected to presumptive, confirmatory and complete tests. Disinfectant efficacies of the NaOCl and aloe vera were evaluated and compared on the eight isolated microorganisms from the water samples, using the disc diffusion method with various condition and parameters for the two disinfectants. The results showed that coliform counts were <2, 49, >1800 and >1800 cfu/100ml for the tap water, well water, oil polluted water and leachate respectively. Aloe vera looks more stable in its disinfectant capability when compared with NaOCl at the storage temperatures especially at 0, 25 and 35oC. Furthermore, the p-values for using aloe vera and NaOCl as disinfectants under various conditions of concentration, temperature and sun exposure period ranged between 0.011 and 0.749 with most of the p-values indicating non-significant differences while few ones showed significant differences. On the average, the results showed that aloe vera could be used as a substitute for sodium hypochlorite for disinfection of water from multiple sources
Review of Suspension Control and Simulation of Passive, Semi-Active and Active Suspension Systems Using Quarter Vehicle Model
Get PDFThis paper reviewed vehicle suspension control and also simulated passive, semi-active and active suspension system using quarter vehicle model with the help of Matlab software. The suspension system of a vehicle is meant to isolate the occupants of the vehicle from the disturbances occasioned by irregular road surface to improve ride quality. The main essence of this work is to review and assess the effectiveness of the vehicle suspension system by comparing the ride quality of passive, semi active and active suspension systems based on the set parameters. These parameters are: the unsprang mass displacement, sprung mass displacement and the suspension deflection. When the unsprung mass displacement and the sprung mass displacement were compared, it was found that, the passive suspension system has the highest magnitudes of both unsprung mass and sprung mass displacements. The active suspension system has the least unsprung mass and sprung mass displacements magnitudes. Based on these two parameters that were compared, it was therefore convenient to conclude that the active suspension system provides the best ride quality than the passive and semi-active suspension systems. The semi-active suspension system was also found to provide better ride quality than the passive suspension system based on unsprung mass and sprung mass displacements. When the suspension deflections of the passive, semi-active and active suspension systems were compared, it was found that, the semi-active suspension system has the least suspension deflection than the passive and active suspension systems under the same road conditions
Autonomous Mobile Robot Motion Control for Hospital Disinfection
Get PDFAs our society develops, robotic systems become indispensable. In producing automation can be used for scanning the impure areas in hospital. In this article MATLAB\u27s "Robotics System Toolbox," to simulate robot navigation. This essay attempts to demonstrate the efficacy of two path planning techniques: pure-pursuit and the probabilistic roadmap (PRM). To compare the performances of four maps, whose difficulty was gradually increased. For PRM, the number of nodes was first set after the map had been loaded. Initial and final positions were then established. Following that, the program built a possible network of links between the nodes at the start and goal locations. Finally, the algorithm analyzed this network of connected nodes to return a collision-free path. In pure-pursuit, the algorithm\u27s main goal is to select a suitable look-ahead distance. In its most basic form, The Pure Pursuit algorithm examines the difference in heading between the current vehicle and the objective point along the course. It is a proportional controller. The effectiveness of the Pure Pursuit algorithm implementations was tested in a variety of situations. The algorithm used in all of the tests followed a straight path between high level waypoints. It\u27s necessary to keep in mind that PRM path position was the only navigation sensor employed in these studies when analyzing their results
Strong Asymmetry and the Mode, Median, and Mean Inequality
Get PDFThis paper introduces the consoled strong asymmetry and variation coefficient as generalizations of the standard measures of Pearson skewness coefficient and variance. Using these new measures, the concept of strong asymmetry is introduced. We prove that the median-mean inequality is valid for that kind of distribution, but even in that case, there is no relation between mode and median. A property similar to first-order stochastic dominance is proved for the variation coefficient. We also discuss the implications of that concept into economics
The Denial of Science in the Antisystem Populist Rhetoric
Get PDFThe article aims to carry out a conceptual resumption of antiscience populism, revisiting theoretical research that points to the “us” versus “them” binarism that characterizes the movement, shifts away from political elites and focuses on scientific elites, portraying them as antagonists of common people and political leaders. The study starts from the premise that populism against science refers to a political performance style that arises in contexts of democratic crises and that manifests itself in a generalized disbelief in traditional institutions. It highlights the importance that the media played in consolidating populism against science. In the pre-digital era, the effectiveness of populist leadership depended a lot on the leader\u27s personal abilities, his oratory and the team\u27s ability to articulate speeches adjusted to different media. Contemporary populism, on the other hand, is structured by the consonance between the media apparatus, the discursive mechanism and a tactic politics for the construction of hegemony. The article uses bibliographic research as a methodology and lists some classic and contemporary trends in populism. The results show that anti-science populism is a movement that derives from the character of contemporary populism that emerges in the context of institutional crises and uses digital media as an apparatus
Modeling the Performance of Development Programs: The Case of a Human Development Program in a Public Administration in Morocco
Get PDFThis paper presents the results of our research on the modeling and analysis of a development program to improve performance. Through our contribution, we intend to support the public managing entity to determinate the factors influencing the choice of measures to be put in place in order to improve the performance of the program for which it is responsible. Our systemic approach allowed us to take into account the multiple criteria and the complex aspect of our study object. This complexity is mainly illustrated by the multiple dimensions and the numerous interactions between entities and actors involved in these programs. We engaged in an analysis of the existing work by modeling the business processes in our case study using the Business Process Management Notation (BPMN). This step allowed us to visualize the progress of each process by highlighting their components, the actors involved, and the existing interactions. Next, we were interested in understanding the existing influence relationship between the components of our processes. This work was carried out to create a logical path to guide our approach for improving the performance of the development program studied
Dr Determining the Optimum Descaling Requirement of Utilising Multiple Flat Fan Nozzles in cleaning Paraffin Inflicted Petroleum Production Tubing: Flow Assurance
No full textDespite the recent detailed results obtained from numerous researches in the utilisation of hydraulic descaling techniques that elaborates the erosion behaviour of multiple high-pressure flat fan nozzles in descaling petroleum production tubing’s embedded with different types and shapes of scale deposits. Through the adoption of both hydrodynamic connected parameters like injection pressure and numbers of nozzles and also the non-hydro connected parameters like stand-off distance, nozzles arrangements and chamber pressure. That lead to achieving the main research goal of enhancing the removal capacity via the permutation and combination of the aforementioned descaling parameter. Theirs still need of determining the best combination of descaling parameters required for effectively and efficient descaling of each type of scale deposit. Thereby, developing an operational guide for removing each scale type and shape when utilising multiple high-pressure nozzles and other descaling parameters will be very valuable for the petroleum production technologist handling the flow assurance of a scale inflicted well. This novel experimental scale removal technique utilizes multiple high-pressure spray of up to 10MPa and low flow rate of 12 l/m from multiple flat fan nozzles of different arrangement and stand-off distance. That is housed in a constructed simulated production tubing chamber with vacuum and compression capacities to remove constructed wax deposit (paraffin) of different shapes signifying different growth stages of paraffin in production tubing.?Generally, the performance of each or combination of the descaling parameters during the experiment depends on the shape and type of the scale deposit in question, most especially the chamber air concertation and nozzles arrangements. Also, the amount removed of all the respective scale deposit was found to increase with increase in injection pressure and reduction in number of nozzles. Likewise, the effect of stand-off distance toward the erosion rate of all the respective descaling candidates was found to reduce with increase in downhole jetting position, even though could be compensated with the right choice of nozzles arrangement
Application the Adomian Decomposition Method to the Dynamic Response Analysis of Cracked Beam under Moving Load
Get PDFIn this article, the Adomian method of decomposition (ADM) is used to examine the vibration of a simply supported cracked beam (SSCB) under a moving load based on the Euler Bernoulli hypothesis. the system modelled as two segments of the beam are to be connected by a massless elastic rotational spring. Bearing in mind each segment of a cracked beam a substructure that can be modeled using ADM. ADM derives for the first time on the basis of kinematic conditions and boundary conditions the characteristic / eigenvalue equation and mode shape functions of the cracked beam under a moving load. The results obtained from ADM are compared to the results obtained from the method of finite elements (FEM). ADM results show remarkable superiority compared to FEM
A Study on the Factors Affecting Postoperative Vomiting in Children Who Undergo Operations of Chelio and Palatoscysis Defects
Get PDFPostoperative nausea and vomiting (PNOV) is common and distressing problem after chelio-palatoscysis surgery associated with which also delay discharge from hospital. While gender, motion sickness, previous history of PONV, and the surgery itself remained as risk factors also drugs used for general anesthesia. Postoperative analgesia and antiemetic may affect the incidence of PNOV. Here we present the related factors as: age, sex, agitation operation, and time of operation. Materials and methods : We have studied 108 patients from 9month to 36munths ASA status I-II .We have study the incidence of PNOV on related factors as ASA, age, sex, weight, anesthesia and time of operation. The PNOV is observed on 24 hours after op. Results were expressed as mean ± standard deviation median. Comparisons of numerical variables between groups were done by employing t test for independent samples. It is considered significant p<0.10. Results: The results shows that there is no any significance on sex, weight, ASA, anesthesia. But there is significance on time of operation. (p < 0.10 ). The mean standard for ASA is 0.18, time 60.09, age 11.3munth, weight 5.13, anest. 0.45, PNOV 0.12. The confidence R2 means that there are other factors which interfere on the incidence of PNOV. Conclusions: The increased incidence of PNOV on time of the operation ask from the anesthesiologist to consider seriously to administer antiemetic, cortisone and analgesic drug during the operations of chelio - palatoscysis surgery. The collaboration between surgeon and anesthesiologist for applying local anesthesia and cortisone in the end of the surgery will be helpful on pain controlling affecting the on lowing of the incidence of PNOV