Menoufia University, Faculty of Electronic Engineering
Menoufia Journal of Electronic Engineering Research
1687-1189
2682-3535
18
1
2008
01
01
Coordination, Resource Allocation, and Deadlock Avoidance of Hybrid Processes Using Discrete Event Supervisors
1
22
EN
Hamdi A.
Awad
Dept. of Industrial Electronics and Control Engineering, Faculty of Electronic Engineering, Minufiya University, Minuf, 32952, Egypt.
Ahmed R.
Anwar
Dept. of Industrial Electronics and Control Engineering, Faculty of Electronic Engineering, Minufiya University, Minuf, 32952, Egypt.
Mostafa M.
Gomaa
Dept. of Computer and Systems Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt.
M. M.
Sharaf
Dept. of Industrial Electronics and Control Engineering, Faculty of Electronic Engineering, Minufiya University, Minuf, 32952, Egypt
10.21608/mjeer.2008.64142
The complex man-made systems which have a hybrid nature contain two distinct types of systems, one with continuous dynamics (Continuous Variable Dynamic System; CVDS) and the other with discrete dynamics (Discrete Event Dynamic System; DEDS). Studying such systems is central in designing intelligent hybrid control systems with high degree of autonomy and it is essential in designing discrete event supervisory controllers for continuous local controllers. The main objective of this paper is to design a discrete event supervisory controller for continuous systems. This controller should perform coordination, resource allocation, and deadlock avoidance tasks at the higher level of the hybrid systems. A batch chemical process is employed for testing the proposed scheme in this paper.
: Hybrid Systems,DEDS,Supervisory Control,Petri Nets
https://mjeer.journals.ekb.eg/article_64142.html
https://mjeer.journals.ekb.eg/article_64142_d41d8cd98f00b204e9800998ecf8427e.pdf
Menoufia University, Faculty of Electronic Engineering
Menoufia Journal of Electronic Engineering Research
1687-1189
2682-3535
18
1
2008
01
01
FRACTIONAL FUZZY LOGIC PID CONTROLLER
23
37
EN
B. A.
ABOUZALAM
Department of Industrial Electronics and Automatic Control Engineering,
Faculty of Electronic Engineering, Menoufia University, Egypt
S. G.
ELNASHAR
Department of Industrial Electronics and Automatic Control Engineering,
Faculty of Electronic Engineering, Menoufia University, Egypt.
10.21608/mjeer.2008.65225
<span>An algorithm for designing a fuzzy controller for fractional systems is presented. The essential idea is to design a nonlinear PID controller using fuzzy reasoning logic at the same time fuzzying the fractional orders of both the integrator and the differentiator, to produce a fractional order fuzzy controller. The gains of the fractional order controller are automatically and continuously adjusted. The fractional orders of the integration and differentiation are obtained based on a designed rule base, so they will be changed according to the error and the change of the error. Numerical simulation results demonstrate the effectiveness of the proposed algorithm in handling linear and nonlinear fractional systems as well as chaotic systems.</span>
Fractional Systems,Fuzzy Logic,PID Controllers
https://mjeer.journals.ekb.eg/article_65225.html
https://mjeer.journals.ekb.eg/article_65225_d41d8cd98f00b204e9800998ecf8427e.pdf
Menoufia University, Faculty of Electronic Engineering
Menoufia Journal of Electronic Engineering Research
1687-1189
2682-3535
18
1
2008
01
01
Geometrical Approach for Face Detection and Recognition
38
48
EN
Osama
Rezq
Physic and Mathematic Department, Faculty of Eng., Helwan University, Egypt
Ayman
EL-SAYED
0000-0002-4437-259X
Dept. of computer science and Eng., Faculty of Electronic Engineering, Menoufya University, EGYPT
ayman.elsayed@el-eng.menofia.edu.eg
10.21608/mjeer.2008.65218
A method for face detection and recognition using geometrical relationships of faces is presented in this paper. A gray level of image which is thresholded to produce a binary, edged image is required for face detection step then finding the head outline and then extracting it to perform the process of recognition. A pre-processing step will occur to remove the noise effect and to produce the accurate outline of head curve. The system is composed of a face detection stage presented previously which provides good results maintaining a low computational cost. After the integration of the two stages, several improvements are proposed which increase the face detection and recognition rate and the overall performance of the system. Application of these techniques has led to measurements of characteristic features of the human face with sufficient accuracy to merit later inclusion in full package for automated facial recognition. Good results have been obtained.
https://mjeer.journals.ekb.eg/article_65218.html
https://mjeer.journals.ekb.eg/article_65218_d41d8cd98f00b204e9800998ecf8427e.pdf
Menoufia University, Faculty of Electronic Engineering
Menoufia Journal of Electronic Engineering Research
1687-1189
2682-3535
18
1
2008
01
01
IMPROVED FOCUSED CRAWLING USING BAYESIAN OBJECT BASED APPROACH
49
60
EN
Ahmed
Ghozia
Dept. of computer Science and Eng., Faculty of Electronic Engineering, Menoufya University, EGYPT
Hoda
Sorour
Dept. of computer Science and Eng., Faculty of Electronic Engineering, Menoufya University, EGYPT.
Ashraf
Aboshosh
Eng. Dept., NCRRT, Atomic Energy Authority, EGYPT
10.21608/mjeer.2008.65223
<span>The rapid growth of the World-Wide-Web made it difficult for general purpose search engines, e.g. Google and Yahoo, to retrieve most of the relevant results in response to the user queries. A vertical search engine specialized in a specific topic became vital. Building vertical search engines is accomplished by the help of a focused crawler. A focused crawler traverses the web selecting out relevant pages to a predefined topic and neglecting those out of concern. The focused crawler is guided toward those relevant pages through a crawling strategy. In this paper, a new crawling strategy is presented that helps building a vertical search engine. With this strategy, the crawler is kept focused to the user interests toward the topic. We build a model that describes the Web pages' features that distinguish relevant Web documents from those that are irrelevant. This is accomplished in the form of a supervised learning process, the web page is treated as an object having a set of features, and the features' values determine the relevancy of the web page through a Bayesian model. Results from practical experiments proved the efficiency of the proposed crawling strategy.</span>
https://mjeer.journals.ekb.eg/article_65223.html
https://mjeer.journals.ekb.eg/article_65223_d41d8cd98f00b204e9800998ecf8427e.pdf
Menoufia University, Faculty of Electronic Engineering
Menoufia Journal of Electronic Engineering Research
1687-1189
2682-3535
18
1
2008
01
01
Construction of eleven and thirteen mutually orthogonal path-squares
61
72
EN
R. A.
El-Shanawany
Dept. of Physics and Engineering Mathematics,
Faculty of Electronic Engineering, Menoufya University, EGYPT
10.21608/mjeer.2008.65216
In this paper, we give an introduction to an area of combinatorial theory which deals with. mutually orthogonal (MOGSs) where is a spanning subgraph of That is, we will investigate the maximal number of a collection of of order <em>n</em> which are orthogonal in pairs. The most general object studied in this theory is a set of the so-called mutually orthogonal Latin squares (MOLSs) of order which are equivalent to mutually orthogonal if . That is, this approach is an extension of MOLSs. Our objective in this paper is to discuss two direct constructions from conjecture in [7] for all prime numbers to obtain MOGSs where .
aph decompositions,MOLSs,Orthogonal double cover
https://mjeer.journals.ekb.eg/article_65216.html
https://mjeer.journals.ekb.eg/article_65216_d41d8cd98f00b204e9800998ecf8427e.pdf
Menoufia University, Faculty of Electronic Engineering
Menoufia Journal of Electronic Engineering Research
1687-1189
2682-3535
18
1
2008
01
01
Physical Properties of the Superconducting System YBCO Containing Different Rare Earth Elements such as Eu, Er and Nd
73
84
EN
M.S.
Shams
Dept. of Physics and Mathematical Engineering, Faculty of Electronic Engineering, Menoufya University, EGYPT
K.M.
El-Shokrofy
Physics and Mathematical Engineering Department, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt
M.A.T.
Dawoud
Dept. of Physics and Mathematical Engineering, Faculty of Electronic Engineering, Menoufya University, EGYPT.
E.M.
Farag
Physics and Mathematical Engineering Department, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt
10.21608/mjeer.2008.65221
Powder samples of the high temperature superconducting system YBCO have been synthesized with partial replacement of the Yttrium site by rare earth element according to the formula <em>Y<sub>1-x</sub> RE<sub>x</sub> Ba<sub>2</sub> Cu<sub>3 </sub>O<sub>7-δ</sub></em> <em>(RE= Eu, Er and Nd</em>) where x= 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and1.0 mole%. The samples were checked by X-ray diffraction. X-ray analysis' show that the dominant phase is the orthorhombic phase for most samples. Also the samples were checked by Infra-red spectroscopy for determining different modes. Differential thermal analysis used to determine the melting points of the samples. The temperature dependence of electrical resistivity for all samples has been recorded and discussed. Adding rare earth elements such as Eu, Er and Nd improve the superconducting behavior, particularly at certain percentages, depending on the replacing element. Therefore we can conclude that careful replacement of the Yttrium site in the YBCO system with some rare earth elements may improve the superconducting behavior.
superconductors,YBCO,Er,Eu,ND,X-ray,Infrared,electrical resistivity,DTA
https://mjeer.journals.ekb.eg/article_65221.html
https://mjeer.journals.ekb.eg/article_65221_d41d8cd98f00b204e9800998ecf8427e.pdf