Islamic Azad University, Rasht Branch
Iranian Journal of Optimization
2008-5427
01
1
2009
04
01
SENSITIVITY ANALYSIS IN LINEAR-PLUS-LINEAR FRACTIONAL PROGRAMMING PROBLEMS
1
12
EN
B
Kheirfam
Department of Mathematics Azarbaijan University of Tarbiat Moallem
In this paper, we study the classical sensitivity analysis when the right - hand – side vector, and the coefficients of the objective function are allowed to vary.
sensitivity analysis,Linear fractional programming
http://ijo.iaurasht.ac.ir/article_513234.html
http://ijo.iaurasht.ac.ir/article_513234_4fbf40f8d8b6a9ee9f70b218f9422080.pdf
Islamic Azad University, Rasht Branch
Iranian Journal of Optimization
2008-5427
01
1
2009
04
01
VARIATIONAL ITERATION METHOD FOR FREDHOLM INTEGRAL EQUATIONS OF THE SECOND KIND
13
23
EN
J.
Biazar
Department of Mathematics, Faculty of Science, University of Guilan
jafai.biazar@gmail.com
H.
Ebrahimi
Department of Mathematics, Islamic Azad University, Rasht branch
In this paper, He‘s variational iteration method is applied to Fredholm integral equations of the second kind. To illustrate the ability and simplicity of the method, some examples are provided. The results reveal that the proposed method is very effective and simple and for first fourth examples leads to the exact solution.
Variational iteration method,FREDHOLM INTEGRAL EQUATION,Lagrange multiplier,RESTRICTED VARIATION
http://ijo.iaurasht.ac.ir/article_513235.html
http://ijo.iaurasht.ac.ir/article_513235_14a9e303586f0f535073676a64a9d2a0.pdf
Islamic Azad University, Rasht Branch
Iranian Journal of Optimization
2008-5427
01
1
2009
04
01
A NONLINEAR MATHEMATICAL MODEL FOR ASTHMA: EFFECT OF ENVIRONMENTAL POLLUTION
24
56
EN
NARESHA
RAM
Department of Mathematics, Harcourt Butler Technological Institute
Kanpur -208002, India
Agraj
Tripathi
Department of Mathematics, Bhabha Institute of Technology Aonha, Kanpur-209 204, India
In this paper, we explore a nonlinear mathematical model to study the spread of asthma due to inhaled pollutants from industry as well as tobacco smoke from smokers in a variable size population. The model is analyzed using stability theory of differential equations and computer simulation. It is shown that with an increase in the level of air pollutants concentration, the asthmatic (diseased) population increases. It is also shown that along with pollutants present in the environment, smoking (active or passive) also helps in the spread of asthma. Moreover, with the increase in the rate of interaction between susceptibles and smokers, the persistence of the spread of asthma is higher. A numerical study of the model is also performed to see the role of certain key parameters on the spread of asthma and to support the analytical results.
Pollutants,SMOKERS,Asthma,Stability,LIAPUNOV FUNCTION,Computer Simulation
http://ijo.iaurasht.ac.ir/article_513236.html
http://ijo.iaurasht.ac.ir/article_513236_1ef862b2da26d7558e75ea1b64c1c2e1.pdf