Global Journal of Computer Science and Technology (GJCST)
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Analysis of Routing Algorithms based on the Natural Inspiration
Get PDFNature is a great and immense source of inspiration for solving hard and complex problems in computer science since it exhibits extremely diverse, dynamic, robust, complex and fascinating phenomenon. Nature inspired algorithms are metaheuristics that mimics the nature for solving optimisation problems opening a new era in computation. A new agent-based routing algorithm using optimisation techniques is implemented in this paper. The different optimisation techniques are warty frog fish, artificial ant, ant, ant lion, grey wolf, genetic algorithm (GA) are the combinations used in the packet delivery between the networks. The routing is a process of carrying the data from source to destination in the network. The output of these algorithms is determined by the simulation time. The experiments are implemented with the NS2 software platform, which is based on the basics of C, C++ and TCL scripting language. The results of the algorithm showed that the grey wolf optimiser (GWO) is much better than the other algorithms in the packet delivery between the networks
Bottom-up Update Mechanism for Re-structured Complete Binary Trees
Get PDFThis paper introduces a bottom-up update mechanism together with a non-recursive initial update procedure that reduces the required extra memory space and computational overhead. A new type of tree is defined based on a different geometrical interpretation of Complete Binary Trees. The new approach paves the way for a special and practical initialization of the tree, which is a prerequisite for an implementation of unilateral update operation. The details of this special initialization and the full update procedures are given for Complete Binary Trees. In addition, a comparison is made between the introduced update method and the bilateral update methods in terms of different performance related metrics
Secure Elliptic Curve Digital Signature Algorithm for Internet of Things
Get PDFIn the previous couple of years, the internet of things (IoT) is gaining additional and a lot of attention each within the academia and in the industrial worlds. A wide accepted notion of the internet of things (IoT) is stated the chance of militarization everyday objects with adequate technology to permit them to speak with alternative objects, identify themselves, or perhaps participate to distribute computing. These things are customarily stated as SO2019;s (Smart Object), might be drawn as actual relics augmented with computing, communication, actuations and storing functionalities. Their importance resides within the capabilities they need to create physical environments 201C;smart201D; therefore as to offer novel cyber physical service to individuals. smart Objects, that are vital elements of the IOT, are everyday objects that are equipped with hardware components like radio for communication, a CPU hardware to process tasks, sensors to be responsive to the globe within which they're located and to regulate it at a given instant. Even so, as sensible objects have restricted resource constraints to appoint sturdy protection mechanisms, they're at risk of subtle security attacks. For this reason, a smart authentication mechanism that considers every helpful resource constraints and safety is needed
Application of Computer Programming to Estimate Volumetric Change of an Active Drilling Fluid System Cause by Elastic Deformation of an Open Borehole Section Wall
Get PDFVolumetric changes in the active drilling fluid system during drilling operation are commonly termed borehole ballooning or breathing. One of the borehole ballooning contributors is the elastic deformation of an open borehole wall. When the elastic deformation of the open borehole wall occurs, it causes a volumetric change in the active drilling fluid volume in the system; the change in volume will be variable depending on the well in question and occurs frequently. Prediction of the volumetric change is highly complex, simply because huge number of complicated equations involved. Therefore, the use of the computer is necessary to reduce the process time and improve the prediction accuracy. Hence, Standalone software has been developed (built on Matlab) in order to estimate and quantify the volumetric change of the active drilling fluid system. The main objective of the presented Standalone software is to utilize the existing in situ principal stresses gradients, pore pressure gradient and rock geomechanical properties in order to compute the change in borehole volume for different flow rates. Moreover, it indicates any possible changes might occur to the equivalent circulating density within the referred system. The core of the presented Standalone software are two analytical formulas, which initially are used to estimate the radial elastic displacement for any point along the open borehole wall, which in turn will be utilized to quantify the volumetric change of the drilling fluid system for the entire open borehole section. The complete governing equations of the developed software are provided and described in detail. In order to examine the functionality of the software, two case studies have been performed using the developed software, several scenarios were assumed for both cases. The base scenario was defined to use the actual wel
The Role of Information Technology in National Security: aoA Case Study of Nigeriaa
Get PDFThe growing challenge of security in Nigeria is of concern to all and every effort must be employed to combat this challenge. Some of the pertinent questions raised in the paper are, Can our Information Technology skill
Performance Evaluation of ALOHA-CS MAC Protocol
Get PDFThe main task of a MAC protocol is to prevent simultaneous transmissions or resolve transmission collisions of data packets while providing energy efficiency, low channel access delays and fairness among the nodes in a network [1]. The Aloha protocol is a fully decentralized medium access control protocol. This protocol was introduced to improve the utilization of the shared medium by synchronizing the transmission of devices. The performance of the Carrier sense Pure ALOHA is evaluated in this paper on the basis of throughout of the system and the average number of retransmission needed for the successful transmission of a packet. Performance criteria are analyzed with change of offered load of the system. The simulation is a Monte Carlo based one on the MATLAB platform
WE TCP-AP: Wireless Enhanced TCP-AP
Get PDFCongestion control in wireless networks is strongly dependent on the dynamics and instability of wireless links. It is known that TCP experiences serious performance degradation problems in wireless networks. New approaches based on TCP try to overcome these problems but, although their performance is increased, they incur in congestion control errors, since they do not evaluate accurately the capacity and available link bandwidth in wireless networks. This is also the case of TCP-AP (Adaptive Pacing) that, although presenting clear advantages in wireless networks when compared to other TCP-based approaches, its performance is still lower than rate-based approaches. In this paper we propose a new congestion control protocol based in TCP-AP, the Wireless Enhanced TCP-AP (WE TCPAP).This protocol relies on the MAC layer information gathere by a new method to accurately estimate the available bandwidth and the path capacity over a wireless network path. The new congestion control mechanism is evaluated in different scenarios in wireless mesh and ad-hoc networks, and compared against several approaches for wireless congestion control. It is shown that the new WE TCP-AP outperforms the base TCP-AP, with a more stable behavior and better channel utilization, and its performance gets close to the one of ratebased protocols. This is a very important result, as we show that TCP-based approaches are still able to have good performance in wireless mesh and ad-hoc networks
Gateway Placement in Mesh Network using Traffic Offloading through 2G/3G Networks
No full textWireless mesh network is a new network paradigm to provide seamless internet services In this network users interact with access points also called router are placed at various points in cities and user can access the internet by connecting to these access points Access points in turn connect via multi hop to internet gateway Internet gateway provides internet services Wireless Mesh network suffers from congestion problems with increasing user base Many solutions have been examined previously like increasing the gateways optimum location of gateways etc but all these still solutions have a constraint on maximum scalability and many times traffic load is maximum only at a certain period of time and later load is less so scaling is not a profitable solution in this case as the access point is not loaded to capacity most of time and cost spent on it is not fruitful Considering this problem we have proposed a hybrid mesh network solution integrating 2G 3G network into mesh network 1 to handle the load on a mesh network But the location of the gateway is fixed in this approach based on the traffic offloading pattern if the gateway can be moved we can still achieve some more QOS In this paper we explore this idea and propose a solution for effective placement of gateway for the offloaded mesh networ
Efficient E-Government Services, Constraints and Problems of Technical Applications and Software and the Transition to Smart Government
Get PDFThat e-governance is the concept and structure of the system and the functions and activities of all activities and processes in e-business on the one hand the level of e-government and business on the other. Because the government sector as a significant proportion of the total economic sectors in most countries of the world, and the fact that dealing with the public sector is not limited to the class and not others, but prevail all citizens and residents, institutions and others, and the fact that this multi-dealing in quality, methods and how it is done and models for different procedures and steps implemented and locations between the corridors of government departments, the concept of e-government came as an ideal way for the government to enable them to take care of the interests of the public from individuals and institutions electronically using cutting-edge technology without the need for the applicant to move between government departments
Improved Image Denoising Filter using Low Rank
Get PDFBetter diagnosis of disease is possible only with the better microscopic images. To do so images of the affected area are captured and then noise is removed to obtain accurate diagnosis. Many algorithms have been proposed till date. But they are capable of removing noise only in spatial domains so this paper tries to overcome that by combining low rank filter and regularization. If we only reduce noise in spatial or spectral domain, artefacts or distortions will be introduced in other domains. At the same time, this kind of methods will destroy the correlation in spatial or spectral domain. Spatial and spectral information should be considered jointly to remove the noise efficiently. Low rank algorithms are good as they encloses semantic information as well as poses strong identification capability