Hala Mansour

• Professor
• Benha University

In this paper, a new tri-band metamaterial absorber based on crossed sun fractal structure for Radar Cross Section (RCS) reduction is presented. The proposed metamaterial absorber (MMA) exhibits three distinct absorption peaks at 2.2, 5.9 and 6.8 GHz with peak absorption values of 97, 91.6 and 93.3 % respectively. The proposed MMA unit cell is prin...

This paper presents the design and analysis of a new compact quad-band metamaterial absorber (MMA). The proposed structure is constructed as an array of 12x13 unit cells, each one is based on a combination of interlaced I/square resonators supporting four distinct resonant frequencies. The proposed metamaterial unit cell is printed on FR-4 substrat...

Ultrasonic device is used in many different fields. It is used to detect objects; measure distances and gives a lot of information about oil and gas flows. The flow in pipes can be measured by ultrasonic flow meters, which measures the average velocity of flowing Material. In this paper, we will go through a new application by injecting a solvent w...

In this article we introduce a quick manual for radiowave absorption measurement techniques. Researchers, developers, manufactures and end users of radiowave absorber material need parameters and performance evaluation. This manual is aimed to help research beginners as well as experts to select a suitable performance test method that can be adopte...

The electroencephalogram (EEG) is a recording of the electrical activity of the brain from the scalp. The recorded waveforms reflect the cortical electrical activities. EEG activity is quite small, measured in microvolts (µV). The EEG signal frequency ranges from less than 4 Hz and little higher than 30 Hz. The aim of this paper is to find the rela...

This paper presents a super-resolution (SR) technique for enhancement of infrared (IR) images. The suggested technique relies on the image acquisition model, which benefits from the sparse representations of low-resolution (LR) and high-resolution (HR) patches of the IR images. It uses bicubic interpolation and minimum mean square error (MMSE) esti...

Human Security against the risks of burglary, gas Leakage and fire accident is the main objective of this research. This paper demonstrates the design and Implementation of IoT based security system in buildings via Node MCU and Blynk server with WiFi network connectivity. This system comprises wireless slave sensor nodes and a master controlle...

Breast cancer is one of the most common diseases in the recent period, it is the second leading cause of death worldwide. More than 1.8 million new breast cancer cases are diagnosed every year worldwide. In Egypt, the estimated number of cancer cases According to the results of the national population-based cancer registration program increased in...

Breast cancer is one of the most common diseases in the recent period, it is the second leading cause of death around the world. Appears in channels (tubes that carry milk to the nipple) and glands of milk in the breast. Both men and women are affected, but male infestation is rare. The causes of the disease are still unknown accurately. Studies sh...

This paper presents a fabulous enhancement approach for infrared (IR) images. This approach mixes the benefits of the undecimated Additive Wavelet Transform (AWT) with the homomorphic transform and Contrast Limited Adaptive Histogram Equalization (CLAHE). The basic idea of this approach depends on applying the CLAHE on the IR image. Then, the resul...

At present, cost is considering a serious factor in world of electricity. Finding ways to reduce overhead and shorten time factor as much as possible is now vital, when combined with finding best ways for transfer power. The Energy Service Providers (ESPs) have resorted to managing the coordination of each party's requirements by unifying units (th...

Breast cancer (BC) disease is considered as a leading cause of death among women in the whole world. However, the early detection and accurate diagnosis of BC can ensure a long survival of the patients which brought new hope to them. Nowadays, data mining occupies a great place of research in the medical field. The Classification is an effective da...

Nowadays, the using of the computer is more important than before while the speech is the easiest way to communicate with the computer. Automatic Speech Recognition (ASR) also known as computer speech recognition is the process in which speech signal is converted into a sequence of words, where the speech is the input of speech recognition system a...

A new 3GPP audio coder, this coder called Enhanced Voice Services (EVS), which is a high definition full band audio coder (HD), that provides new features for improving the real-time audio communication systems. The ordinary speech coders operate in the time domain. To improve the quality of the audio encoders, these encoders operate in the frequen...

Nowadays, the need of Automatic Speech Recognition (ASR) is more than before, because of the important of using computer in our life at the recent moments. So we need to improve ASR system with high quick results without decrease quality of system to keep pace with progress and evolution, where feature extraction techniques and matching or recognit...

The objective of any night vision system is to enable a person to see in the dark. A low-contrast image puts a contrast constraint on the human observer visibility at night. This is the basic reason for the large number of accidents at night. This research presents two proposed approaches to enhance the visibility of the infrared (IR) night vision...

Trajectory tracking of Unmanned Aerial Vehicles (UAVs) is a very challenging and complicated field of research due to their nonlinear and underactuacted dynamics. In this paper, a real time trajectory tracking controller is developed for a quadrotor. A state feedback with integral action control scheme is designed for the position controller to ens...

In Arab countries, the hearing impaired people exceeds 10 million. In Egypt, the number of hearing-impaired people is around 4 million. So Sign language is important for facilitating communication between hearing impaired and the rest of society, but not all the rest of society know this language so, a new approach is suggested for designing a smar...

The quality of speech is essential in communication systems. Enhanced Voice Services (EVS) is one of the speech Coders that standardized by the 3GPP for LTE. EVS supports audio bandwidth, offers high quality for mixed content (i.e. speech and music). Many coders that depend on the concept of ACELP may be affected by the change in the spoken languag...

This paper presents a new enhancement approach for infrared images. The idea behind this technique is based on that modifies the local luminance mean of an image and controls the local contrast as a function of the local Luminance mean of the image. The algorithm first separates an image into LPF (low pass filtered) and HPF (high pass filtered) com...

This paper presents a new approach for contrast enhancement of infrared images. This technique combines the benefits of Histogram Equalization image processing of infrared images. The idea behind this algorithm adjusts the contrast of infrared images as these images are dark naturally so result high enhancement by using histogram equalization. This...

This paper proposes a novel enhancement method for infrared images (IR) .This algorithm based on contrast limited adaptive histogram equalization (CLAHE) that adaptive and improves infrared images. Some attempts are proposed for enhancement of infrared images using this model, since infrared images have several many applications, it is expected tha...

In all modern communications, speech coding plays a very vital role. It is a basic element in the efficient use of BW and QoS issues. Many standard bodies generate a series of speech coders with different rate, quality and delay combinations. Most of these CODECs have been built for 7 languages not including the Arabic or its accents. In this paper...

Speech coding is the process of digitizing the voice in a few bits as possible. Parametric Coding is the encoding technique at which the parameters of the speech signal will be extracted frame by frame during the encoding process. Code Excited Linear Prediction " CELP " is one major type of that category of CODECs. The comparison between the CODECs...

Speech coding is the process of converting voice signal into digital form in a few bits as possible. The newly developed Code Excited Linear Prediction " CELP " coders is one major type of the parametric coders which combines between low data rates and good speech quality. Most of these coders have been built initially for 7 languages not included...

In this paper, novel virtual instrumentation based systems for real-time collision-free path planning and tracking control of mobile robots are proposed. The developed virtual instruments are computationally simple and efficient in comparison to other approaches, which act as a new soft-computing platform to implement a biologically-inspired neural...

Chronic infection with hepatitis C virus (HCV) is a major public health problem, with nearly 170 million infected individuals worldwide. Current treatment for chronic infection is a combination of pegylated IFN-α2 and ribavirin (RBV); however, this treatment is effective in fewer than 50% of patients infected with HCV genotype 1 or 4. Recent studie...

The incidence of hepatitis C virus (HCV) genotype 4 infection in Egypt provides a unique opportunity to study the innate immune response to symptomatic acute HCV infection. We investigated whether plasmacytoid dendritic cells (pDCs) are activated as a result of HCV infection. We demonstrate that, even during symptomatic acute infection, circulating...

Face verification has been widely studied during the past two decades. One of the challenges is the rising concern about the security and privacy of the template database. In this paper, we propose a secure face verification system which employs a user dependent one way transformation based on a two stage hashing algorithm. We first hash the face i...

This paper considers field programmable gate array (FPGA) implementations for blind adaptive decision feedback equalizer (DFE) based on the IP core reported. The design can achieve channel equalization for 16-QAM and 64-QAM. Constant modulus algorithm (CMA) and multi-modulus algorithm (MMA) are considered for update the coefficients in the blind mo...

A variable step size technique is applied to joint modified constant modulus algorithm (MCMA) and decision-directed (DD) equalization algorithm to speed up convergence with respect to the original algorithm. The same technique is used with joint CMA and DD algorithm and exhibits improved performance.

In this paper, a secure face recognition system is presented, in which face detection is performed with skin color detection followed by light normalization and normalized cross correlation. Principal component analysis (PCA) is used for face verification. Due to the rising concern about the security and privacy of the biometric system, we offer a...

The aim of this study was to estimate the proportion of spontaneous viral clearance (SVC) after symptomatic acute hepatitis C and to evaluate the efficacy of 12 weeks of pegylated interferon alfa-2a in patients who did not clear the virus spontaneously. Patients with symptomatic acute hepatitis C were recruited from two "fever hospitals" in Cairo,...

The General Packet Radio Service (GPRS) is designed for packet switching data transmission and provides mobile access to packet data networks, e.g. the Internet. In this paper, two different protocols are proposed to study the performance of multimedia integrated traffic (as voice, rt-VBR video and data traffics) over GPRS network. Data traffic is...

We consider the problem of controlling the vertical motion of a nonlinear model of a helicopter during landing, while stabilizing the lateral and longitudinal position and maintaining a constant attitude. The dynamics of the helicopter main and tail rotors are often neglected to simplify the control design, but this reduction has the disadvantage o...

In this paper, we explore, via an extensive simulation study the design and performance evaluation of P-PRMA protocol that multiplexes voice traffic at the talkspurt level to efficiently integrate voice, rt-VBR video and data traffics in third generation picocellular wireless networks. We show the effect of preemption over PRMA by comparing two ver...

Hardware Description Languages (HDLs) are commonly used to construct hardware systems. Reuse of the design is a common practice to improve the productivity nowadays. In this paper, an implementation of a fully pipelined ARM compatible processor core, which can be embedded into System-on-Chips (SOCs) is presented. The implementation aims to support...