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Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Design of a Fuzzy Controller for Stabilizing Unmanned Helicopter System
Abdul Azim
Sobaih
B. A.
ABouzalam
EL-Khatib
Kamal
A control algorithm for a class of non-linear uncertain systems is presented. The algorithm utilizes fuzzy systems based on "Takagisugeno" (TS) fuzzy models to approximate nonlinear systems. TS fuzzy systems are classified into three families based on the input matrices and a robust controller synthesis procedure is given for each family. It has been shown that the proposed method leads to robust control structure over a wide range of uncertainties of plant parameters. The unmanned helicopter system is used to illustrate the effectiveness of the proposed method
2009
01
01
1
20
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes
Adel l
Zaghlou
Rasheed
El-Awady
Sayed
Kamel
Sohair
Mahfouz
In this work, a method of analysis for directional coupler device is proposed. Normally, directional coupler operates at lower values of normalized frequency "Vx". So, the corresponding normalized propagation constant "bx" becomes approximately in logarithm to relation to Vx. Therefore, the simplified model is used to find the propagation constant, coupling coefficient and their changes with the controlled voltage. As illustrative applications, the proposed method is applied to the power divider/combiner ratios, the bandpass wavelength filter and three waveguides directional coupler. The analysis of the electro-optically controlled directional coupler becomes simple with more evidence and very good agreement. The effect of the controlled voltage on the coupling coefficient is very weak so, the output power of the directional coupler is affected by the change of propagation constants (i.e. by the controlled voltage).
2009
01
01
47
62
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
On Ultimate Optical (10000 Channels) Transmission in Submarine Cables under Different Depth Conditions (Rigorous Analysis)
Abd-El-Naser A.
Mohammed
Abd-El-Fattah A.
Saad
Mohamed A.
Metawe’e
Ultimate optical transmission of 10000 channels huge submarine cables has been investigated under different depth conditions. Two amplification techniques are considered (the engagement of Raman and Erbium-doped fiber amplifiers). The double impact of both temperature and pressure is investigated through the defined depth penalty. Three transmission times division multiplexing techniques are studied namely soliton, nonlinear and maximum time division multiplexing. Also, two multiplexing methods are considered in the design of ultra-wide wavelength division multiplexing (UW-WDM) (10,000 optical channels) and ultra-wide space division multiplexing UW-SDM (400 fiber links). Based on experimental data, both the deep ocean water temperature and pressure are tailored as functions of the water depth. The product of the transmitted bit rate and the repeater spacing is processed over wide ranges of the affecting parameters, where both the repeater spacing and the transmitted soliton bit rate are in positive correlations with the total number of links.
2009
01
01
1
18
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Full Wave Analysis of Superconducting Unilateral Finline Resonators on Ferroelectric/Anisotropic Substrates
Abdel-Aziz T. K.
Shalaby
A full wave analysis based on the spectral domain immittance approach is carried out to calculate the resonant frequency and the quality factor of superconducting unilateral finline resonators on ferroelectric / anisotropic substrates. Numerical results to show the effect of the dielectric nonlinearity of the ferroelectric layer and other parameters have been obtained and are presented.
2009
01
01
19
26
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Neural Network Approach to Variable Vehicle Speed Limitation upon Weather Conditions
Maged M. M.
Fahmy
The target of this research is to adapt a Neural Network Approach that could be used in determining proper vehicle speed upon relevant conditions data. These include weather condition such as: Precipitation intensity, speed of wind, and degree of visibility, and road surface condition. Data are input to neural network. Output driven is a decision about allowed (advised) speed of a vehicle along highway which is appropriate to the atmospheric and road surface conditions at locations of interest. Such application could reduce the possibility of accidents resulting from excess speed when bad weather condition.
2009
01
01
105
118
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Potential Using Artificial Neural of Network to Predict Student Success/ Failure for Preliminary Study
Maged M. M.
Fahmy
Academic failure among first-year university students has long raised a large number of arguing. Many educational psychologists and researchers have tried to understand and then explain it. The target of this research is to adapt a Neural Network Approach that can be used to predict student’s success-failure risk. Multilayer feed forward back error propagation artificial neural network model has been adapted and trained with available data driven from existing academic acceptance system results. A performance analysis is done to analyze the effectiveness of such model for this particular problem. The result of this study shows that the neural network model can predict students' performance, if the current and future samples have similar characteristics.
2009
01
01
93
104
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
New Queuing and Scheduling Strategies for Improving Multimedia Networking
H.
El-Khobby
G.
Attiya
S.
Khames
M.
Abd Elnaby
Active Queue Management (AQM) in routers has been a very active research area in the Internet community to support congestion control. The most well-known AQM is Random Early Detection (RED). This approach, while necessary and powerful with the Transmission Control Protocol (TCP) flows, is not sufficient with non-TCP flows such as multimedia traffic. In this paper, we propose a queuing and scheduling strategies to the RED AQM so as to improve the performance of multimedia applications on the Internet. In the proposed strategy, multiple queues are used in the internet router and the arriving packets are queued according to their class type. Additionally, the queued packets are scheduled according to different low and high priorities.
2009
01
01
81
92
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Improved Thermographic Object Detection relying-on Image Processing and Sensorial Development of Quantum IR Photodetectors
A.
Aboshosha
A.
Nasr
M.
Hassan
The manuscript is devoted to improve of the thermographic object detection. This research work complies two phases. The first phase of this framework focuses on the enhancement of quantum IR photodetectors (QIRPs) performance based on studying the responsivity (R) and its dependence on QIRPs parameters. The semiconductor-based QRIPs include quantum (well QWIPs, wire QRIPs, and dot QDIPs) photodetectors. Moreover, the study is directed to the most sensitive device among these three quantum types. While the second phase of the study presents robust object detection in IR images by employing multistage efficient image processing techniques. Firstly, we enhance the quality of the images to simplify the process of object extraction. This enhancement, preprocessing, relies mainly on denoising and histogram quantization. Secondly, the segmentation phase is employed to extract the object under interest.The segmentation is implemented based on fuzzy c-mean clustering.
2009
01
01
63
80
Menoufia Journal of Electronic Engineering Research
1687-1189
1687-1189
2009
19
1
Comparative Study of Different Coverage Models for High Altitude Platform
This paper is devoted to study the footprint analysis of High Altitude Platform Cellular Communications, geostationary high altitude (GEO) and low earth orbit (LEO) satellites using three models: The first one is an approximated model for flat earth, which can be used in small coverage area or in case of high elevation angle and the correction of this model takes into consideration the curvature of the earth to correct the error of flat earth and gives good results for the minor and major axes of elliptical footprint. The second model of the spot beam depends on the inclination angle and gives good results compared to the HAP results of the first model. Also it gives good result for LEO satellite with elevation angle between 40 to 99 degrees. Also the second model was developed to give HAP good results for major and minor elliptical axes to calculate the beamwidth. The third model obtains the coverage area diameter with zero inclination angle and can be used for satellites at different LEO and GEO orbits and gives good results for a wide range altitude from 500 km to 36,000km, which is identical with practical results given by [12].
2009
01
01
29
46