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Search Results: 1 - 10 of 198195 matches for " Hamdy N. Agiza "
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An English-to-Arabic Prototype Machine Translator for Statistical Sentences  [PDF]
Hamdy N. Agiza, Ahmed E. Hassan, Noura Salah
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.41003
Abstract: Authors of that paper proposed a prototype machine translator system to translate scientific English sentences into Ara- bic sentences. This system is based on natural language processing and machine learning. This proposed system is ap- plied in statistical field, which is very important on a mathematical sub field in Math department. The system is ana- lyzed, designed and developed. Author tested the proposed system on some statistical statements. It proves its validity as a prototype system.
Intrusion Detection Using Rough Sets based Parallel Genetic Algorithm Hybrid Model
Wa'el M. Mahmud,Hamdy N. Agiza,Elsayed Radwan
Lecture Notes in Engineering and Computer Science , 2009,
Abstract:
Nonlinear dynamics in the Cournot duopoly game with heterogeneous players
H. N. Agiza,A. A. Elsadany
Physics , 2002, DOI: 10.1016/S0378-4371(02)01648-5
Abstract: We analyze a nonlinear discrete-time Cournot duopoly game, where players have heterogeneous expectations. Two types of players are considered: boundedly rational and naive expectations. In this study we show that the dynamics of the duopoly game with players whose beliefs are heterogeneous, may become complicated. The model gives more complex chaotic and unpredictable trajectories as a consequence of increasing the speed of adjustment of boundedly rational player. The equilibrium points and local stability of the duopoly game are investigated. As some parameters of the model are varied, the stability of the Nash equilibrium point is lost and the complex (periodic or chaotic) behavior occurs. Numerical simulations is presented to show that players with heterogeneous beliefs make the duopoly game behaves chaotically. Also we get the fractal dimension of the chaotic attractor of our map which is equivalent to the dimension of Henon map.
Phase transitions in some epidemic models defined on small-world networks
H. N. Agiza,A. S. Elgazzar,S. A. Youssef
Quantitative Biology , 2003, DOI: 10.1142/S0129183103004978
Abstract: Some modified versions of susceptible-infected-recovered-susceptible (SIRS) model are defined on small-world networks. Latency, incubation and variable susceptibility are included, separately. Phase transitions in these models are studied. Then inhomogeneous models are introduced. In some cases, the application of the models to small-world networks is shown to increase the epidemic region.
Fixed point theorems for K+1 weakly compatible mappings
N. Faried,S. Hamdy
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
From skeletal to non skeletal: The intriguing roles of BMP-9: A literature review  [PDF]
E. Leblanc, G. Drouin, G. Grenier, N. Faucheux, R. Hamdy
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.410A4004
Abstract:

In the well-known superfamily of transforming growth factors beta (TGF-b), bone morphogenetic proteins (BMPs) are one of the most compelling cytokines for their major role in regulation of cell growth and differentiation in both embryonic and adult tissues. This subfamily was first described for its ability of potentiating bone formation, but nowadays, the power of BMPs is well beyond the bone healing scope. Some of the BMPs have been well studied and described in the literature, but the BMP9 is still worthy of attention. It has been shown by many authors that it is the most potent osteogenic BMP. Moreover, it has been described as one of the rare circulating BMPs. In this paper, we will review the recent literature on BMP9 and the different avenues for future research in that field. Our primary scope is to review its relation to bone formation and to elaborate on the available literature on other systems.

Vibration of Gold Nano-Beam with Variable Young’s Modulus Due to Thermal Shock  [PDF]
Eman A. N. Al-Lehaibi, Hamdy M. Youssef
World Journal of Nano Science and Engineering (WJNSE) , 2015, DOI: 10.4236/wjnse.2015.54020
Abstract: In this paper, we will study the most important effects in the nano-scale resonator: the coupling effect of temperature and strain rate, and the non-Fourier effect in heat conduction. A solution for the generalized thermoelastic vibration of nano-resonator induced by thermal loading has been developed. The Young’s modulus is taken as a linear function of the reference temperature. The effects of the thermal loading and the reference temperature in all the studied fields have been studied and represented in graphs with some comparisons. The Young’s modulus makes significant effects on all the studied fields where the values of the temperature, the vibration of the deflection, stress, displacement, strain, stress-strain energy increase when the Young’s modulus has taken to be variable.
On a New Cournot Duopoly Game
H. N. Agiza,A. A. Elsadany,M. M. El-Dessoky
Journal of Chaos , 2013, DOI: 10.1155/2013/487803
Abstract: This paper presents a new Cournot duopoly game. The main advantage of this game is that the outputs are nonnegative for all times. We investigate the complexity of the corresponding dynamical behaviors of the game such as stability and bifurcations. Computer simulations will be used to confirm our theoretical results. It is found that the chaotic behavior of the game has been stabilized on the Nash equilibrium point by using delay feedback control method. 1. Introduction The classic model of oligopolies was proposed by the French mathematician A. Cournot [1]. He treated the case with nave expectations; at each time step players assume that the competitors produce the same quantity of goods already produced in the last period. The presence of complex dynamic phenomena in Cournot oligopoly models is well documented in the mathematical economics literature, starting from Rand [2] and Dana and Montrucchio [3]. The oligopoly market structure showing the action of only two companies is called duopoly. In duopoly game, each duopolist believes that he can calculate the quantity he should produce in order to maximize his profits. In fact, the properties of the best reply dynamics of Cournot duopoly games have been extensively studied by Puu [4, 5] who showed that trajectories may not converge to the Nash equilibrium and that complex trajectories are possible. Over the past decade, many researchers, such as Kopel [6], Bischi et al. [7], Ahmed and Agiza [8], and Agiza and Elsadany [9], have paid a great attention to the dynamics of games. The theoretical development of complex duopoly dynamics has been recently surveyed in [10, 11]. We consider a market consisting of a duopoly in which both firms, the domestic and the foreign firm, compete on quantities rather than price of production for a certain good. Let , , represent the quantity of th firm during the period and the selling prices. Suppose that the goods in a market are identical. The inverse demand functions of products come from the maximization by the representative consumer of the following fractional utility function: subject to the budget constraint Using Lagrange multiplier to maximize utility function (1) subject to the budget constraint (2), one gets In this paper, we present a new Cournot’s duopoly game by using inverse demand function which was deduced in (3). The dynamical behavior of this game and the stability conditions for the Nash equilibrium are given. Theoretical analysis and numerical simulations of the system are made in detail. Finally, we give a feedback control to control chaos and
Anti-CD-20 Therapy in Refractory Adult Still’s Disease  [PDF]
Reem Hamdy A. Mohammed
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2012, DOI: 10.4236/ojra.2012.22002
Abstract: Adult Still’s disease is a relatively rare form of rheumatoid arthritis with systemic inflammatory features. The prevalence is around 1.5 cases per 100,000 - 1000,000. In the current case we display a 30-year-old male patient with refractory adult still’s disease who suffered recurrent attacks of fever 39.5°C, arthritis in proximal interphalangeal joints (PIPs), wrists, tempromandibular joints (TMJs), knees and ankles, stitching chest pain, dyspnea, erythematous rash over the trunk, sore throat, weight loss (15 Kilograms in 4 months). The patients’ disease remained uncontrolled despite of synthetic disease modifying anti-rheumatic drugs and repeated intramuscular corticosteroid injections. Laboratory workup revealed erythrocyte sedimentation rate (ESR) of 95, C-reactive protein (CRP) of 100 mg/L, hemoglobin 10.5 gm%, leukocytosis 12,000/microlitre, mild elevation of liver function tests and dyslipidemia. Serology revealed negative rheumatoid factor, anti-nuclear antibody titre of 1:80, elevated serum ferritin 4000 micrograms/litre. The patient was started on rituximab (375 mg/m2), prednisolone 20 mg/day and selective Cox-2 inhibitor. Follow up for over three months following the completion of his pulse therapy, revealed no relapse of fever or fatigue, with morning stiffness of 5 - 10 minutes, VAS of 3, DAS28 of 3.8, HAQDI of 0.62, ESR 23, CRP 4.9, Hb 12.5 gm%, leucocytic count 9000/microlitre, the dose of prednisolone was successfully reduced to a dose of 5 mg/day orally. Conclusion: Anti-CD20 therapy successfully controlled systemic and articular refractory disease with sustained efficacy over a follow up period of up to 24 weeks.
Contribution of Satellite Altimetry Data in the Environmental Geophysical Investigation of the Northern Egyptian Continental Margin  [PDF]
Hamdy Ahmed Mohamed Aboulela
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.33047
Abstract: The northern Egyptian continental margin is characterized by interesting tectonic settings as well as trade and industry district in Egypt. In the current study, the contribution role of satellite altimetry gravity data in the Environmental geophysical investigation is presented to give a complete view of the marine gravity field of the study area. The satellite data showed only minor deviations in some partial regions of the area investigated such as Nile Deep Sea Fan, Levant Basin, Eratosthenes Seamount and Herodotus basin. The interpretations of the entire data illustrated that the differences between the satellite and the shipboard data were small in some regions particularly near to land. Furthermore, a number of strong deviations in some regions were spatially correlated with bathymetric depth together with the appearance of geological structures.
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