المنشورات العلمية

Investigation of the Continuous Wavelet Transform Method for Use with Late Time Response Analysis of Concealed on Body Threat Objects

Abstract- investigation of the use of continues wavelet transform (CWT) method to late time response analysis for detecting on body concealed threat objects proposed in this paper. The transient backscattered mechanisms of on body concealed weapons target signatures are studied using the wavelet analysis technique in which signal processing algorithm is developed and the Morlet wavelet applied to extract and analyses the re-radiated transient response of concealed targets. Experimental work was done by using simple and complex objects such as wire and handgun, Wavelet analyses of backscattered data from various objects are presented, the results show that the Continues wavelet transform (CWT) has the ability to detect and discriminate between the hidden-on body objects.
ali atiah, (7-2019)
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Multi-Carrier Modulation Techniques for Light Fidelity Technology

The Light-Fidelity(Li-Fi) is very new technology It is a new solution for multiple users. and the modulation techniques for this technology are reviewed in this paper. Li-Fi uses light as a carrier it is a type of wireless communication systems. Li-Fi can be used in sensitive areas without causing interference. Single carrier modulation (SCM) techniques are used in Li-Fi. Multicarrier modulation (MCM) techniques offer power, spectral and efficiency for Li-Fi. Li-Fi solves insufficiency of radio frequency bandwidth, provides security, low implementation, and cannot penetrate human body. Modulation techniques for Li-Fi technology are reviewed in this paper.)
Khaled S. Tarmissi, (3-2019)
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DESIGN OF A HYDROGEN ENGINE PERFORMANCE ANALYSIS TOOL

This paper presents a designing and implementing a simulator that allows performance analysis of a hydrogen engine. The simulator is developed using MATLAB. The simulator allows assessing the effect of air-fuel ratio (AFR) and engine rotational speed on the performance of a four cylinder hydrogen fuelled port injection internal combustion engine. The significance of this simulation is that performance of an experimental hydrogen engine can be predicted on purely theoretical basis, without actually performing the experiment. The performance parameters include Brake Specific Fuel Consumption (BSFC) and Brake Thermal Efficiency. It allows changing the input parameters and observing the influence of changed parameters on the overall performance of the engine. This has been made possible through the means of mathematical modelling. Through this model, a set of governing equations has been derived which gives near accurate results to the actual experimental values.
Mohammed Eliwa Mohammed Eliwa, Hamza Khalifa Jahran, (3-2019)

Characteristics of Tapered Slot Antenna for on body buried Objects detection

The detection of human body worn concealed metallic objects based on the late time response (LTR) method is one of the great challenges. Successful LTR extraction to identify the target signature and its correct interpretation requires UWB antenna, which can cover the frequency of the fundamental (lowest) complex natural resonance (CNR) of the target(s) under detection. A flat gain UWB tapered slot antenna with operating bandwidth of 0.25-3GHz to cover the lowest CNR frequencies designed and fabricated. Antenna tests made in an anechoic chamber to provide complete back scattering and signal radiation control. The results showed that the fabricated antenna has relative flat gain from about 0.3GHz to just over 3GHz with distortion less narrow pulse transmission.
ali atiah, (3-2019)
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Modified Enhanced Recursive Median Filter for Image De-noising

Abstract ـــ Despite begin known for many years that an enhancement and analysis of digital image has been played an important role in many engineering applications. The enhancement technique usually performed through nonlinear filter rather than linear filter. The performance of an image filtering system depends on algorithms ability to detect the presence of noisy pixels in the image. This paper, deals with impulse noise in every pixel in the image, which will be tested first to determine whether if it is corrupted or not. So the Modified Enhanced Recursive Median Filter will be applied on the corrupted pixels while the uncorrupted pixels is retained. The performance of proposed filter is measured visually and also numerically using Mean Square Error (MSE) and Peak Signal to Noise Ratio (PSNR) of different filtered images. It shows the capability to remove low and high density impulsive noise and preserving the edges.
Farag J Zbeda, (3-2019)

(The solution of the problem of fraud in the papers by using inert chip (TAG


ADEL A M ABOSDEL, (0-2019)

Performance of Spatial Modulation for Multiple-Antenna Wireless Systems Over Uncorrelated Rayleigh Flat Fading Channel

The trend towards achieving higher data rates in wireless communications is endless and requires sophisticated transmission mechanisms that are capable to deliver higher spectral efficiency. Multiple input Multiple output (MIMO) wireless communications were realized to have an inevitability in accelerating evolution of higher data rates. However, although MIMO technique achieves better diversity and antenna gain, it faces the problem of inter channel interference (ICI) due to the multiple number of radio frequency (RF) chains. Another major disadvantage of this mechanism is to use maximum likelihood (ML) detector for attaining better performance of bit error rate; however, it generates a significant decoding complexity which exponentially increases with increasing number of transmit antennas. For these reasons the attention has been shifted to introduce a new transmission mechanism that can overcome problems faced in conventional MEMO. Spatial modulation (SM) was the best candidate to resolve that issues and increase the spectral efficiency over multipath fading channel. In SM only a single antenna will be active for the period of data transmission, means only one RF chain is deployed. This entirely removes (ICI) and decreases decoding complexity. The contribution of this paper is to introduce the concepts of SM and evaluate its bit error rate (BER) performance over uncorrelated Rayleigh fading channel with the use of ML decoding algorithm.
Abdulati I. O. Abdullah, (12-2018)
موقع الناشر

Performance of Spatial Modulation for Multiple-Antenna Wireless Systems Over Uncorrelated Rayleigh Flat Fading Channel

The trend towards achieving higher data rates in wireless communications is endless and requires sophisticated transmission mechanisms that are capable to deliver higher spectral efficiency. Multiple input Multiple output (MIMO) wireless communications were realized to have an inevitability in accelerating evolution of higher data rates. However, although MIMO technique achieves better diversity and antenna gain, it faces the problem of inter channel interference (ICI) due to the multiple number of radio frequency (RF) chains. Another major disadvantage of this mechanism is to use maximum likelihood (ML) detector for attaining better performance of bit error rate; however, it generates a significant decoding complexity which exponentially increases with increasing number of transmit antennas. For these reasons the attention has been shifted to introduce a new transmission mechanism that can overcome problems faced in conventional MEMO. Spatial modulation (SM) was the best candidate to resolve that issues and increase the spectral efficiency over multipath fading channel. In SM only a single antenna will be active for the period of data transmission, means only one RF chain is deployed. This entirely removes (ICI) and decreases decoding complexity. The contribution of this paper is to introduce the concepts of SM and evaluate its bit error rate (BER) performance over uncorrelated Rayleigh fading channel with the use of ML decoding algorithm.
Abdulati I. O. Abdullah, Ibrahim K. Shati , Ahmed H. Elshoshi, Abubaker M. Algatlawi, (12-2018)
موقع الناشر