OALib Journal期刊

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匹配条件: “Mehdi Beyramijam” ,找到相关结果约2523条。
Calculation of stroke risk in persons above 55 years old without history of stroke who referred to health centers in Hamadan on 2012
Mehrdokht Mazdeh,Hamid Sadeghibidar,Mehdi Beyramijam,Farzaneh Esnaashari
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Cerebrovascular accidents are the third leading cause of mortality and the most important cause of morbidity in adults in the most of the world. Multiple factors such as Socioeconomic, lifestyle, environmental and genetic factors may be the cause of stroke risk differences in our community. This study was designed to evaluate the Stroke Risk Factor in persons above 55 years old without history of Stroke who referred to Health Centers in Hamadan on 2012.Material and Methods: In a Descriptive- Analytical study, 300 person above 55 years without history of stroke who referred to Health centers of Hamadan were selected (randomly),with regarded of inclusion and exclusion criteria and after explaining the research and its purposes, their permission was obtained. Their demographic data (such as age, gender), history of heart disease, hypertension and drug reception for it, diabetes, hyperlipidemia, smoking were filled in questionnaire. One EKG was performed (about the atrial fibrillation and signs of left ventricular hypertrophy).then data were analyzed and average tenth year stroke risk with use the Prof. Donald Smith software (stroke risk calculator) calculated.Results: The mean age, risk factors and systolic blood pressure in men and women were: 68.62±10006y, 2.16±1.33 and 129.05±18.71mmHg. History of diabetes mellitus, hyperlipidemia, smoking, hypertension(HTN), drug reception for HTN, drug reception in persons with history of HTN, SBP≥140mmHg, drug reception in persons with SBP≥140mmHg,Cardiovascular disease, atrial fibrillation(AF rhythm) and signs of left ventricular hypertrophy(LVH)in EKG have frequency: 19066%, 28%, 19%, 42023%, 34%, 29%, 59077%, 20033%, 3033%, 8033% respectively. The mean calculated stroke risk was for tenth year 10071%.This risk was 11074% in men and 9052% in women population.Conclusion: It’s can be concluded that with regard to transition of socioeconomic and community especially aging and international experience of epidemiologic transition, stroke risk factors and consecutive stroke risk in Hamadan as a small sample of a developing country are rapidly increasing . Its hope that experiences obtained in developed countries applied in preventive programs and healthy planning.
A simple 2D interpolation model for analysis of nonlinear data  [PDF]
Mehdi Zamani
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.26080
Abstract: To determination the volume and weight of non uniform bodies, such as in ore deposits evaluation for mining and rock cutting for construction, the methods of interpolation are usually used. The classic curves, which are frequently used to interpolate onedimensional data are cubic spl ine, Bspline and Bezier curves. These methods have good efficiency for determination of geom etric characteristics of nonregular masses. They have some limitations and problems with two dimensional interpolation analysis such as for ming large linear systems of equations with a lot of entries and difficulty encounter with their solutions. In this research the twodimensional splines are used, which have the advantages of simplicity and less computational operations ef fort. The spline functions that are applied have the continuity of C1 at elements boundaries. The presented model has suitable efficiency for vo lumes of large extents governing to lots of data.
Application of He’s Variational Iteration Method and Adomian Decomposition Method to Solution for the Fifth Order Caudrey-Dodd-Gibbon (CDG) Equation  [PDF]
Mehdi Safari
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.28131
Abstract: In this work we use the He’s variational iteration method and Adomian decomposition method to solution N-soliton solutions for the fifth order Caudrey-Dodd-Gibbon (CDG) Equation.
Analytical Solution of Two Extended Model Equations for Shallow Water Waves By Adomian’S Decomposition Method  [PDF]
Mehdi. Safari
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14042
Abstract: In this paper, we consider two extended model equations for shallow water waves. We use Adomian’s decomposition method (ADM) to solve them. It is proved that this method is a very good tool for shallow water wave equations and the obtained solutions are shown graphically.
Application of He’s Variational Iteration Method for the Analytical Solution of Space Fractional Diffusion Equation  [PDF]
Mehdi Safari
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.29150
Abstract: Spatially fractional order diffusion equations are generalizations of classical diffusion equations which are increasingly used in modeling practical super diffusive problems in fluid flow, finance and others areas of application. This paper presents the analytical solutions of the space fractional diffusion equations by variational iteration method (VIM). By using initial conditions, the explicit solutions of the equations have been presented in the closed form. Two examples, the first one is one-dimensional and the second one is two-dimensional fractional diffusion equation, are presented to show the application of the present techniques. The present method performs extremely well in terms of efficiency and simplicity.
A simple piecewise cubic spline method for approximation of highly nonlinear data  [PDF]
Mehdi Zamani
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.41012
Abstract: Approximation methods are used in the analysis and prediction of data, especially laboratory data, in engineering projects. These methods are usually linear and are obtained by least-square-error approaches. There are many problems in which linear models cannot be applied. Because of that there are logarithmic, exponential and polynomial curve-fitting models. These nonlinear models have a limited application in engineering problems. The variation of most data is such that the nonlinearity cannot be approximated by the above approaches. These methods are also not applicable when there is a large amount of data. For these reasons, a method of piecewise cubic spline approximation has been developed. The model presented here is capable of following the local nonuniformity of data in order to obtain a good fit of a curve to the data. There is C1 continuity at the limits of the piecewise elements. The model is tested and examined with four problems here. The results show that the model can approximate highly nonlinear data efficiently.
Numerical Investigation of the Effect of Process and Sheet Parameters on Bending Angle in the Laser Bending Process  [PDF]
Mehdi Safari
World Journal of Mechanics (WJM) , 2014, DOI: 10.4236/wjm.2014.44011

In this work, the effects of process parameters such as laser output power, beam diameter and scan speed and also sheet thickness on the bending angle have been numerically investigated in the laser bending process. For this purpose, Abaqus software is used for investigating the effect of various process and sheet parameters on the bending angle. The results show that with increasing the laser output power, bending angle is increased. Also, the bending angle is decreased with increasing the beam diameter, scan speed and sheet thickness.

Using GIS Data to Build Informed Virtual Geographic Environments (IVGE)  [PDF]
Mehdi Mekni
Journal of Geographic Information System (JGIS) , 2013, DOI: 10.4236/jgis.2013.56052

In this paper, we propose a novel approach to automatically building Informed Virtual Geographic Environments (IVGE) using data provided by Geographic Information Systems (GIS). The obtained IVGE provides 2D and 3D geographic information for visualization and simulation purposes. Conventional VGE approaches are generally built upon a grid-based representation, raising the well-known problems of the lack of accuracy of the localized data and the difficulty to merge data with multiple semantics. On the contrary, our approach uses a topological model and provides an exact representation of GIS data, allowing an accurate geometrical exploitation. Moreover, our model can merge semantic information, even if spatially overlapping. In addition, the proposed IVGE contains spatial information which can be enhanced thanks to a geometric abstraction method. We illustrate this model with an application which automatically extracts the required data from standard GIS files and allows a user to navigate and retrieve information from the computed IVGE.


Relationships, Human Behaviour and Financial Transactions  [PDF]
Mehdi Chowdhury
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.49108
Abstract: It is widely known that relationships and human behaviours such as trust, reciprocity and altruism that are observed in the human societies are capable of facilitating financial transactions. This paper proposes a theoretical model to argue that though these elements can facilitate financial transactions, they may not always ensure efficiency in the sense of creation of additional wealth. As financial resources are scarce, the paper argues that the financial transactions induced by relationships, trust, reciprocity and altruism may lead to inefficient allocations of resources.
Analytical Solution of Two Extended Model Equations for Shallow Water Waves by He’s Variational Iteration Method  [PDF]
Mehdi Safari, Majid Safari
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.14027
Abstract: In this paper, we consider two extended model equations for shallow water waves. We use He’s variational iteration method (VIM) to solve them. It is proved that this method is a very good tool for shallow water wave equations and the obtained solutions are shown graphically.

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