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Search Results: 1 - 10 of 5588 matches for " Magdi Hassan "
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Self-Tuning Control for MIMO Network Systems  [PDF]
Magdi S. Mahmoud, Matasm M. Hassan Hamid
Journal of Signal and Information Processing (JSIP) , 2012, DOI: 10.4236/jsip.2012.32020
Abstract: The advances in MIMO systems and networking technologies introduced a revolution in recent times, especially in wireless and wired multi-cast (multi-point-to-multi-point) transmission field. In this work, the distributed versions of self-tuning proportional integral plus derivative (SPID) controller and self-tuning proportional plus integral (SPI) controller are described. An explicit rate feedback mechanism is used to design a controller for regulating the source rates in wireless and wired multi-cast networks. The control parameters of the SPID and SPI controllers are determined to ensure the stability of the control loop. Simulations are carried out with wireless and wired multi-cast models, to evaluate the performance of the SPID and SPI controllers and the ensuing results show that SPID scheme yields better performance than SPI scheme; however, it requires more computing time and central processing unit (CPU) resources.
Error Detection and Reconfigurationin Reliable Ethernet Train Networks  [PDF]
Hassanein H. Amer, Magdi S. Moustafa, Mai Hassan, Ramez M. Daoud
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.14015
Abstract: In this paper, a novel reconfiguration technique is developed in the context of a fault-tolerant Networked Control System (NCS) in two train wagons. All sensors, controllers and actuators in both wagons are connected on top of a single Gigabit Ethernet network. The network also carries wired and wireless entertainment loads. A Markov model is used to prove that this reconfiguration technique reduces the effect of a failure in the error detection and switching mechanisms on the reliability of the control function. All calculations are based on closed-form solutions and verified using the SHARPE software package.
Assessment of Endemic Goiter of Children in Eastern Sudan (Kassala State) Using Ultrasonography and ELISA  [PDF]
Shazaly N. Khojaly, Mohamed Yousef, Mohammed E. Mohamed, Ikhlas A. Hassan, Mogahid M. A. Zidan, Auis Bashir, Magdi Hassan
Open Journal of Medical Imaging (OJMI) , 2018, DOI: 10.4236/ojmi.2018.83004
Abstract: Thyroid gland is one of most important endocrine glands in the body. It plays vital role in growth control and its measurements tends to change in respect to age, sex, weight and ethnic group of the individual. This study aimed to assess endemic goiter and to estimate the measurement of normal thyroid gland dimensions and thyroid hormones level in school-aged children using Ultrasonography and ELISA Technique in Eastern Sudan (Kassala state). A total of 100 subjects is 6 - 18 years (43 males, 57 females), and mean of age (9.73 ± 2.54 years). This study was done in the period from April 2016 to February 2017. All the subject undergone thyroid ultrasound and thyroid hormone level test. Subjects with history of goiter were excluded from the study, by thyroid dimension (length, height and diameter). Thyroid volume was estimated using ellipsoid formula and thyroid hormones (TSH, T3 and T4) using Toso full automation.
A preliminary study on the insect fauna of Al-Baha Province, Saudi Arabia, with descriptions of two new species
Magdi El-Hawagry,Mohammed Khalil,Mostafa Sharaf,Hassan Fadl
ZooKeys , 2013, DOI: 10.3897/zookeys.274.4529
Abstract: A preliminary study was carried out on the insect fauna of Al-Baha Province, south-western part of Saudi Arabia. A total number of 582 species and subspecies (few identified only to the genus level) belonging to 129 families and representing 17 orders were recorded. Two of these species are described as new, namely: Monomorium sarawatensis Sharaf & Aldawood sp. n. [Formicidae, Hymenoptera] and Anthrax alruqibi El-Hawagry sp. n. [Bombyliidae, Diptera]. Another eight species are recorded for the first time in Saudi Arabia, namely: Xiphoceriana arabica (Uvarov, 1922) [Pamphagidae, Orthoptera], Pyrgomorpha conica (Olivier, 1791) [Pyrgomorphidae, Orthoptera], Catopsilia florella (Fabricius, 1775) [Pieridae, Lepidoptera], Anthrax chionanthrax (Bezzi, 1926) [Bombyliidae, Diptera], Spogostylum near tripunctatum Pallas in Wiedemann, 1818 [Bombyliidae, Diptera], Cononedys dichromatopa (Bezzi, 1925) [Bombyliidae, Diptera], Mydas sp. [Mydidae, Diptera], and Hippobosca equina Linnaeus, 1758 [Hippoboscidae, Diptera]. Al-Baha Province is divided by huge and steep Rocky Mountains into two main sectors, a lowland coastal plain at the west, known as “Tihama”, and a mountainous area with an elevation of 1500 to 2450 m above sea level at the east, known as “Al-Sarat or Al-Sarah” which form a part of Al-Sarawat Mountains range. Insect species richness in the two sectors (Tihama and Al-Sarah) was compared, and the results showed that each of the two sectors of Al-Baha Province has a unique insect community. The study generally concluded that the insect faunal composition in Al-Baha Province has an Afrotropical flavor, with the Afrotropical elements predominant, and a closer affiliation to the Afrotropical region than to the Palearctic region or the Eremic zone. Consequently, we tend to agree with those biogeographers who consider that parts of the Arabian Peninsula, including Al-Baha Province, should be included in the Afrotropical region rather than in the Palaearctic region or the Eremic zone.
H Control of Uncertain Fuzzy Networked Control Systems with State Quantization  [PDF]
Magdi S. Mahmoud
Intelligent Control and Automation (ICA) , 2012, DOI: 10.4236/ica.2012.31008
Abstract: The problem of robust H control for uncertain discrete-time Takagi and Sugeno (T-S) fuzzy networked control systems (NCSs) is investigated in this paper subject to state quantization. By taking into consideration network induced delays and packet dropouts, an improved model of network-based control is developed. A less conservative delay-dependent stability condition for the closed NCSs is derived by employing a fuzzy Lyapunov-Krasovskii functional. Robust H fuzzy controller is constructed that guarantee asymptotic stabilization of the NCSs and expressed in LMI-based conditions. A numerical example illustrates the effectiveness of the developed technique.
Insect diversity in Zaranik Protected Area, North Sinai, Egypt
Aly El-Moursy, Magdi El-Ilawagry, Mahmoud Abdeldayem, Hassan Fadl
Egyptian Journal of Natural History , 2001,
Abstract: Egyptian Journal of Natural History Vol.1 1999: 62-80
A new journal is born
Magdi Yacoub
Global Cardiology Science & Practice , 2011, DOI: 10.5339/ahcsps.2011.1
Design of Robust Power System Stabilizer Based on Particle Swarm Optimization  [PDF]
Magdi S. Mahmoud, Hisham M. Soliman
Circuits and Systems (CS) , 2012, DOI: 10.4236/cs.2012.31011
Abstract: In this paper, we examine the problem of designing power system stabilizer (PSS). A new technique is developed using particle swarm optimization (PSO) combined with linear matrix inequality (LMI). The main feature of PSO, not sticking into a local minimum, is used to eliminate the conservativeness of designing a static output feedback (SOF) stabilizer within an iterative solution of LMIs. The technique is further extended to guarantee robustness against uncertainties wherein power systems operation is changing continuously due to load changes. Numerical simulation ahs illustrated the utility of the developed technique.
Optimal Control of Wind Turbines under Islanded Operation  [PDF]
Magdi S. Mahmoud, Mojeed O. Oyedeji
Intelligent Control and Automation (ICA) , 2017, DOI: 10.4236/ica.2017.81001
Abstract: In this paper, an optimal control scheme for wind turbine output torque and power regulation under the influence of wind disturbances is presented. The system considered is a dynamic mechanical-based model with pitch and generator torque actuators for controlling the pitch and generator torque. The performance of linear matrix inequality (LMI) formalism of linear quadratic regulator (LQR); linear quadratic regulator with integral action (LQRI) and model predictive control (MPC) were compared in response to a step change in wind disturbance. It is shown by Matlab simulation that the LQRI outperformed both LQR and MPC controllers.
Experimental and Numerical Study of At-Rest Lateral Earth Pressure of Overconsolidated Sand
Magdi El-Emam
Advances in Civil Engineering , 2011, DOI: 10.1155/2011/524568
Abstract: The paper presents a one-meter-height rigid facing panel, supported rigidly at the top and bottom to simulate nonyielding retaining wall system. A set of load cells is used to measure the horizontal force at the top and bottom of the facing panel, which is converted to equivalent horizontal earth pressure acting at the back of the wall. Another set of load cells is used to measure the vertical load at the bottom of the wall facing, both at the toe and the heel. Uniformly graded sand was used as backfill soil. The measured wall responses were used to calibrate a numerical model that used to predict additional wall parameters. Results indicated that the measured horizontal earth force is about three times the value calculated by classical at-rest earth pressure theory. In addition, the location of the resultant earth force is located closer to 0.4?H, which is higher compared to the theoretical value of H/3. The numerical model developed was able to predict the earth pressure distribution over the wall height. Test set up, instrumentation, soil properties, different measured responses, and numerical model procedures and results are presented together with the implication of the current results to the practical work. 1. Introduction Earth pressure distribution behind retaining wall systems is a soil-structure interaction problem. Therefore, determination of earth pressure distribution at the back of the wall should be done interactively with the deflection of the wall. However, this is not the case in the current design practice. Practically, the hydrostatic earth pressure distribution behind the wall is adopted according to the at-rest, active, or passive earth pressure theories for both internal and external stability analyses. Furthermore, triangular distribution is typically assumed for of the lateral earth pressure for at-rest, active or passive conditions. This assumption can be true for walls that are free to move laterally or rotate around the toe with sufficient movement to initiate the sliding wedge (i.e., active or passive state). However, this is not the case for nonyielding walls that do not develop the limiting static active or passive earth pressure, because the movements are not sufficient to fully mobilize the backfill soil shear strength. Typically, all underground basements walls, tunnels, bridge abutments, culverts, and piles are examples of nonyielding structures that are in contact with soil. These structures usually undergo relatively very small movement which is insufficient to initiate the sliding wedge behind the wall and to
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