2021-09-23T03:14:44Z
https://jmm.guilan.ac.ir/?_action=export&rf=summon&issue=73
Journal of Mathematical Modeling
J. Math. Model.
2345-394X
2345-394X
2015
3
1
SDO relaxation approach to fractional quadratic minimization with one quadratic constraint
Maziar
Salahi
Arezo
Zare
In this paper, we study the problem of minimizing the ratio of two quadratic functions subject to a quadratic constraint. First we introduce a parametric equivalent of the problem. Then a bisection and a generalized Newton-based method algorithms are presented to solve it. In order to solve the quadratically constrained quadratic minimization problem within both algorithms, a semidefinite optimization relaxation approach is presented. Finally, two set of examples are presented to compare the performance of algorithms.
Fractional quadratic optimization
nonconvex problem
convex optimization
semidefinite optimization
2015
06
01
1
13
https://jmm.guilan.ac.ir/article_198_2afefd8e0fbd7908279afb268bcdcf96.pdf
Journal of Mathematical Modeling
J. Math. Model.
2345-394X
2345-394X
2015
3
1
Dynamical behavior and synchronization of hyperchaotic complex T-system
Hossein
Kheiri
Bashir
Naderi
In this paper, we introduce a new hyperchaotic complex T-system. This system has complex nonlinear behavior which we study its dynamical properties including invariance, equilibria and their stability, Lyapunov exponents, bifurcation, chaotic behavior and chaotic attractors as well as necessary conditions for this system to generate chaos. We discuss the synchronization with certain and uncertain parameters via adaptive control. For synchronization, we use less controllers than the dimension of the proposed system. Also, we prove that the error system is asymptotically stable by using a Lyapunov function. Numerical simulations are computed to check the analytical expressions.
Lyapunov stability
Synchronization
Chaos
Adaptive control
2015
06
01
15
32
https://jmm.guilan.ac.ir/article_196_8b4648b64fca3b8b5a1909e25a16abaf.pdf
Journal of Mathematical Modeling
J. Math. Model.
2345-394X
2345-394X
2015
3
1
An efficient numerical method for singularly perturbed second order ordinary differential equation
Jugal
Mohapatra
Manas kumar
Mahalik
In this paper an exponentially fitted finite difference method is presented for solving singularly perturbed two-point boundary value problems with the boundary layer. A fitting factor is introduced and the model equation is discretized by a finite difference scheme on an uniform mesh. Thomas algorithm is used to solve the tri-diagonal system. The stability of the algorithm is investigated. It is shown that the proposed technique is of first order accurate and the error constant is independent of the perturbation parameter. Several problems are solved and numerical results are presented to support the theoretical error bounds established.
Singular perturbation problems
boundary layers
Thomas algorithm
exponential fitting factor
uniform convergence
2015
06
01
33
48
https://jmm.guilan.ac.ir/article_197_ce87e8a8bfb327a62b9bc4f0cd2912ba.pdf
Journal of Mathematical Modeling
J. Math. Model.
2345-394X
2345-394X
2015
3
1
Hydromagnetic Couette flow of class-II and heat transfer through a porous medium in a rotating system with Hall effects
Gauri
Shanker Seth
Prashanta Kumar
Mandal
Rohit
Sharma
Steady hydromagnetic Couette flow of class-II of a viscous, incompressible and electrically conducting fluid through a porous medium in a rotating system taking Hall current into account is investigated. Heat transfer characteristics of the fluid flow are considered taking viscous and Joule dissipations into account. It is noticed that there exists flow separation at the moving plate in the secondary flow direction on increasing either rotation parameter $K^2$ when Hall current parameter $m = 0.5$ or $m$ when $K^2 = 7$. Also there exists flow separation at the moving plate in the secondary flow direction on increasing either magnetic parameter $M^2$ for every value of porosity parameter $K_1$ or $K_1$ when $M^2 = 15$.
Couette flow of class-II
Porous medium
Coriolis force
Hall current
viscous and Joule dissipations
2015
06
01
49
75
https://jmm.guilan.ac.ir/article_205_9dfc74ef6cd9798bedaed2a07880d060.pdf
Journal of Mathematical Modeling
J. Math. Model.
2345-394X
2345-394X
2015
3
1
Bernoulli matrix approach for matrix differential models of first-order
Ahmad
Golbabai
Samaneh
Panjeh Ali Beik
The current paper contributes a novel framework for solving a class of linear matrix differential equations. To do so, the operational matrix of the derivative based on the shifted Bernoulli polynomials together with the collocation method are exploited to reduce the main problem to system of linear matrix equations. An error estimation of presented method is provided. Numerical experiments are reported to demonstrate the applicably and efficiency of the propounded technique.
Linear matrix differential equation
Bernoulli polynomials
operational matrix of derivative
error estimation
2015
06
01
77
89
https://jmm.guilan.ac.ir/article_201_603705fa691297a3e173ef4db4941979.pdf
Journal of Mathematical Modeling
J. Math. Model.
2345-394X
2345-394X
2015
3
1
Determining the order of minimal realization of descriptor systems without use of the Weierstrass canonical form
Kamele
Nassiri Pirbazari
Mehdi
Azari
A common method to determine the order of minimal realization of a continuous linear time invariant descriptor system is to decompose it into slow and fast subsystems using the Weierstrass canonical form. The Weierstrass decomposition should be avoided because it is generally an ill-conditioned problem that requires many complex calculations especially for high-dimensional systems. The present study finds the order of minimal realization of a continuous linear time invariant descriptor system without use of the Weierstrass canonical form.
Descriptor system
minimal realization
Weierstrass canonical form
2015
06
01
91
101
https://jmm.guilan.ac.ir/article_199_73509e717ef96f2eab01c1417ed30360.pdf