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Web caching is an important technique to scale the internet. To increase the speed of browsing, Replacement strategies are used. Least Frequency Used (LFU) replacement strategy is one of these web cache replacement strategies. The lack of LFU strategy is that it ignores download latency and size of object and may store obsolete web object indefinitely. A new proposed replacement strategy based on...
In the last few years a number of search engines have been introduced which support Arabic language. Explain the reasons of late appearance of search engines that related to Arabic language and pages has appeared because Arabic language is morphological language. While other languages such as English or French are language's affixation. This research aims to develop the Arabic search engine and to...
In this paper, DC motor speed is controlled using PID controller and fuzzy logic controller. PID controller requires a mathematical model of the system while fuzzy logic controller base on experience via rule-based knowledge. Design of fuzzy logic controller requires many design decisions, for example rule base and fuzzification. The FLC has two input, one of these inputs is the speed error and the...
In today's world, wireless communication became the master use in any technology that need transferring of data between devices in far distant places. The problems of paratrooper when they reach the land they are scattered and can't find each other's position quickly. Sometimes paratroops don't find their equipment that is thrown from the plane to the ground. The main objective of this study is to...
Enterprise Resourse Planning (ERP) is business process management software that allows an organization to use a system of integrated applications to manage the business and automate many back office functions. Odoo ERP is powerful open source platform for the business applications which have a suite of closely integrated applications that was build to cover all business areas. The idea of this research...
The hopeful technique Massive MIMO is provided to increase the data rates of mobile communication, by arranging antennas to hundreds of the base stations which is the most promising solution for the fifth generation of cellular communication network. In order to cope with the huge demands of communications in the network it has been found that it is useful to have multiple receivers served in the...
In this paper, the clutter estimation problem in the bistatic multiple-input and multiple-output (MIMO) radar system is considered, and a novel compressed sensing (CS)-based model is proposed to describe the clutter by exploiting the clutter sparsity in the angle domain. Then, the CS-based methods are adopted to reconstruct the sparse clutter, and to estimate the clutter scattering coefficients and...
Operational amplifiers have been used for interfacing analog signals to microcontrollers units. Due to its random nature, analog signals vary very much, perhaps then exceed the voltage ranges of operation. Chip manufacturers protect their chips by using diode circuits, but those diodes are not intended to normal use. To overcome the signals which may exceed the limit, clamping circuit have been used...
For any Cubesat the Power System Unit is designed to deliver the required energy so as the nano-satellite can achieve its desired mission. Thus the input energy for the solar panels and the output energy from the solar cells must be increased. The sun tracking system aims to maximize the input solar energy to the solar panels. This paper aims to study the concept of designing sun tracking solar panels...
Vehicular Ad hoc networks (VANETs) have recently attracted both industry and research communities as emerging technology that strongly support people safety and comfort. However, VANET is susceptible to various types of attacks due to the lack of permanent infrastructure, high mobility, and serving broad range of applications. In this paper a simple security system that can provide integrity and privacy...
Breast cancer is the most common cancer among females, and one of the leading causes of death worldwide. Nowadays, the most common method for breast cancer detection is X-ray mammogram screening. Since mammography employs ionizing radiations, the repetition of exposure is not recommended. Aiming to overcome this limitation of the X-ray mammogram screening, a new, low-cost and safe microwave imaging...
This paper demonstrates the design and simulation of input matching circuit for BLF578XR power transistor working at center frequency of 225 MHZ with bandwidth of more than 50 MHZ. Based on the calculated Q-factor and when using the transistor in push pull mode, the input matching circuit is designed in two stages, the first stage is a balun to match 50 ohm to 12.5 ohm and the other stage is to match...
A Bandwidth reservation is an essential component in providing of quality of service (QoS) in vehicular ad hoc networking (VANENTs). The recommended MAC protocol for VANET experiences a high percentage of packet loss. Somehow its performance can be improved by using Time Division Multiple Access (TDMA) techniques. In this paper, we propose a new algorithm for multi-constrained QoS routing and show...
the complexity of sphere detection algorithm is high when the Signal to Noise Ratio (SNR) is low. For this problem, a new type of detection algorithm of sphere decoder is proposed. The new algorithm reduces the radius of sphere when the SNR is low by using the Minimum Mean Square Error (MMSE) algorithm and a compressibility factor. With the result of simulation, It shows that when the SNR is less...
Since the 20th century industrial revolution era, automobiles started playing a key and important role in our daily life activities. But, unfortunately, at the same time, an automobiles related accidents, and problems are representing an increasing source of danger on Human's life. In this paper a design of an autonomous (self-driving) car control system is presented to reduce automobiles-related...
The essential mission requirement of a satellite is the ability to provide a link to transmit information to and from the ground station. In general the communication system of the cube satellite is divided into two subsystems which are telemetry and data subsystem, and beacon subsystem. The telemetry and data subsystem will ensure continuous communication with the ground station. The beacon subsystem...
The objective of this paper is to provide financial analysis of both conventional and renewable resources power plants in order to assess the viability of projects and make an investment decision for the purpose of selecting the most viable one. An estimated scheme of utility-scale solar Photovoltaic system with 93.2 MW targeted designed capacity located around Khartoum area has been selected to be...
The Data Warehouse (DW) design remains a great challenge process for DW designers. As well, so far, there is no strong method to support the requirements analysis process in DW projects. The literature approaches try to solve this tedious and important issue; however, many of these approaches ignore or bypass the requirements elicitation phase. In this paper, we propose a method to generate multidimensional...
Internet security is a branch of computer sciences often involving browser security, network security, applications and operating systems to keep the internet as a secure channel to exchange information by reducing the risk and attacks. There are a number of studies that have been conducted in this field resulting in the development of various security models to achieve internet security. However,...
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