2020-07-07T16:31:09Z https://ijnaa.semnan.ac.ir/?_action=export&rf=summon&issue=38
2015-06-08 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Random differential inequalities and comparison principles for nonlinear hybrid random differential equations Bapurao C. Dhage Ram G. Metkar  In this paper, some basic results concerning strict, nonstrict inequalities, local existence theorem and differential inequalities  have been proved for an IVP of first order hybrid  random differential equations with the linear perturbation of second type. A comparison theorem is proved and  applied to prove the uniqueness of random solution for the considered perturbed random differential equation. Finally an existence of extremal random solution is obtained in  between the given upper and lower random solutions. Random differential inequalities existence theorem comparison principle extremal solutions 2015 06 08 1 19 https://ijnaa.semnan.ac.ir/article_228_3366bac7dc01487f906c0f41f9506933.pdf
2015-08-05 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Quadratic \$rho\$-functional inequalities in \$beta\$-homogeneous normed spaces Choonkil Park Sang Og Kim Jung Rye Lee Dong Yun Shin In cite{p}, Park introduced the quadratic \$rho\$-functional inequalities<br />begin{eqnarray}label{E01}<br />&& |f(x+y)+f(x-y)-2f(x)-2f(y)| \ && qquad le  left|rholeft(2 fleft(frac{x+y}{2}right) + 2 fleft(frac{x-y}{2}right)- f(x) -  f(y)right)right|,  nonumber<br />end{eqnarray}<br />where \$rho\$ is a fixed complex number with \$|rho|<1\$,<br />and<br />begin{eqnarray}label{E02}<br />&& left|2 fleft(frac{x+y}{2}right) + 2 fleft(frac{x-y}{2}right)- f(x) -  f(y)right| \ && qquad le  |rho(f(x+y)+f(x-y)-2f(x)-2f(y))|   , nonumber<br />end{eqnarray}<br />where \$rho\$ is a fixed complex number with \$|rho|<frac{1}{2}\$.<br /><br />In this paper, we prove the Hyers-Ulam stability of the quadratic \$rho\$-functional inequalities (0.1) and (0.2)  in \$beta\$-homogeneous complex Banach spaces and prove the Hyers-Ulam stability of quadratic \$rho\$-functional equations associated with  the quadratic \$rho\$-functional inequalities(0.1) and (0.2) in \$beta\$-homogeneous complex Banach spaces. Hyers-Ulam stability \$beta\$-homogeneous space quadratic \$rho\$-functional equation quadratic \$rho\$-functional inequality 2015 08 05 21 26 https://ijnaa.semnan.ac.ir/article_229_9a2f45cf266e37c07a1530b054082e97.pdf
2015-08-26 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 An inequality related to \$eta\$-convex functions (II) Madjid Eshaghi S. S. Dragomir Mohsen Rostamian Delavar Using the notion of eta-convex functions as generalization of convex functions, we estimate the difference between the middle and right terms in Hermite-Hadamard-Fejer inequality for differentiable mappings. Also as an application we give an error estimate for midpoint formula. eta-convex function Hermite-Hadamard-Fejer inequality 2015 08 26 27 33 https://ijnaa.semnan.ac.ir/article_251_7e96749027a543cb76a0c8816883b38a.pdf
2015-08-13 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Polarization constant \$mathcal{K}(n,X)=1\$ for entire functions of exponential type A. Pappas P. Papadopoulos L. Athanasopoulou In this paper we will prove that if \$L\$ is a continuous symmetric n-linear form on a Hilbert space and \$widehat{L}\$ is the associated continuous n-homogeneous polynomial, then \$||L||=||widehat{L}||\$. For the proof we are using a classical generalized  inequality due to S. Bernstein for entire functions of exponential type. Furthermore we study the case that if X is a Banach space then we have that<br />\$\$<br />|L|=|widehat{L}|,;forall ;; L in<br />{mathcal{L}}^{s}(^{n}X);.<br />\$\$<br />If the previous relation holds for every \$L in {mathcal{L}}^{s}left(^{n}Xright)\$, then spaces \${mathcal{P}}left(^{n}Xright)\$ and  \$L in {mathcal{L}}^{s}(^{n}X)\$ are isometric. We can also study the same problem using Fr\$acute{e}\$chet derivative. Polarization constants polynomials on Banach spaces polarization formulas 2015 08 13 35 45 https://ijnaa.semnan.ac.ir/article_252_67988509b46f50477e7aba6e7d056fd0.pdf
2015-09-08 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 An assessment of a semi analytical AG method for solving two-dimension nonlinear viscous flow S. Tahernejad Ledari H. H. Mirgolbabaee Davood Domiri Ganji In this investigation, attempts have been made to solve two-dimension nonlinear viscous flow between slowly expanding or contracting walls with weak permeability by utilizing a semi analytical Akbari Ganji's Method (AGM). As regard to previous papers, solving of nonlinear equations is difficult and the results are not accurate. This new approach is emerged after comparing the achieved solutions with numerical method and exact solution. Based on the comparison between AGM and numerical methods, AGM can be successfully applied for a broad range of nonlinear equations. Results illustrate, this method is efficient and has enough accuracy in comparison with other semi analytical and numerical methods. Ruge-Kutta numerical method, Variational Iteration Method (VIM), Homotopy Perturbation Method (HPM) and Adomian Decomposition Method (ADM) have been applied to make this comparison. Moreover results demonstrate that AGM could be applicable through other methods in nonlinear problems with high nonlinearity. Furthermore convergence problems for solving nonlinear equations by using AGM appear small. Adomian Decomposition Method (ADM) Akbari-Ganji Method (AGM) Homotopy Perturbation Method (HPM) Variational Iteration Method (VIM) 2015 09 08 47 64 https://ijnaa.semnan.ac.ir/article_270_2b85ea0302d462027207cbdede350c4a.pdf
2015-10-17 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 New existence results for a coupled system of nonlinear differential equations of arbitrary order M.A. Abdellaoui Zoubir DAHMANI N. Bedjaoui This paper studies the existence of solutions for a coupled system of nonlinear fractional differential equations. New existence and uniqueness results are established using Banach fixed point theorem. Other existence results are obtained using Schaefer and Krasnoselskii fixed point theorems. Some illustrative examples are also presented. Caputo derivative Coupled system Fractional differential equation Fixed point 2015 10 17 65 75 https://ijnaa.semnan.ac.ir/article_255_d1b3016bdc3654dc5a27898685246ce5.pdf
2015-11-01 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Existence and uniqueness results for a nonlinear differential equations of arbitrary order Mohamed Houas Maamar Benbachir This paper studies a fractional boundary value problem of nonlinear differential equations of arbitrary orders. New existence and uniqueness results are established using Banach contraction principle. Other existence results are obtained using Schaefer and Krasnoselskii fixed point theorems. In order to clarify our results, some illustrative examples are also presented. Caputo derivative boundary value problem Fixed point theorem local conditions 2015 11 01 77 92 https://ijnaa.semnan.ac.ir/article_256_b585261373d4776c9b9bccf99bd5c1c5.pdf
2015-09-01 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Simulation and perturbation analysis of escape oscillator Patanjali Sharma The dynamical behaviour of the forced escape oscillator, which depends on the parameter values we considered, have been studied numerically using the techniques of phase portraits and Poincar'{e} sections. Also, we employed perturbation methods such as Lindstedt's method to obtain the frequency-amplitude relation of escape oscillator. Escape oscillator Perturbation analysis Lindstedt's method 2015 09 01 93 101 https://ijnaa.semnan.ac.ir/article_257_aa4bfdc2922c3d9fa1ae4f2835dcee72.pdf
2015-11-01 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Continuous time portfolio optimization Alireza Bahiraei Behzad Abbasi Farahnaz Omidi Nor Aishah Hamzah Abdul Hadi Yaakub This paper presents dynamic portfolio model based on the Merton's optimal investment-consumption model, which combines dynamic synthetic put option using risk-free and risky assets. This paper is extended version of methodological paper published by Yuan Yao (2012). Because of the long history of the development of foreign financial market, with a variety of financial derivatives, the study on theory or empirical analysis of portfolio insurance focused on how best can portfolio strategies be used in minimizing risk and market volatility. In this paper, stock and risk-free assets are used to replicate options and to establish a new dynamic model to analyze the implementation of the dynamic  process of investors' actions using dynamic replication strategy. Our results show that investors' optimal strategies of portfolio are not dependent on their wealth, but are dependent on market risk and  this new methodology is broaden in compare to paper of Yuan Yao (2012). Portfolio Investment Strategy Dynamic Optimization 2015 11 01 103 112 https://ijnaa.semnan.ac.ir/article_258_df756db274fd1281ef179f49e16f96e4.pdf
2015-10-14 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Relative orders and slowly changing functions oriented growth analysis of composite entire functions Sanjib Datta Tanmay Biswas Sarmila Bhattacharyya In the paper we establish some new results depending on the comparative growth properties of composition of entire functions using relative \$L^{ast }\$-order (relative \$L^{ast }\$-lower order) as compared to their corresponding left and right factors where \$Lequiv Lleft( rright) \$ is a slowly changing function. Entire function Maximum modulus maximum term composition Growth relative L*-order ( relative L*-lower order) slowly changing function 2015 10 14 113 126 https://ijnaa.semnan.ac.ir/article_259_f4c48019854386ee3f1b27569e9f1837.pdf
2015-10-21 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Orthogonal metric space and convex contractions Maryam Ramezani ‎In this paper, generalized convex contractions on orthogonal metric spaces are stablished in whath  might be called their  definitive versions. Also, we show that there are examples which show that our main theorems are  genuine generalizations of Theorem 3.1 and 3.2 of [M.A. Miandaragh, M. Postolache and S. Rezapour,  {it Approximate fixed points of generalized convex contractions}, Fixed Point Theory and Applications 2013,  2013:255]. ‎orthogonal metric space Fixed point convex contaction 2015 10 21 127 132 https://ijnaa.semnan.ac.ir/article_261_6169f4abc6b5e917baada3b9226fcd27.pdf
2015-11-05 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Modified homotopy method to solve non-linear integral equations Mohsen Rabbani In this article we decide to define a modified homotopy perturbation for solving non-linear integral equations. Almost, all of the papers that was presented to solve non-linear problems by the homotopy method, they used from two non-linear and linear operators. But we convert a non-linear problem to two suitable non-linear operators also we use from appropriate bases functions such as Legendre polynomials, expansion functions, trigonometric functions and etc. In the proposed method we obtain all of the solutions of the non-linear integral equations. For showing ability and validity proposed method we compare our results with some works. Homotopy perturbation integral equations Non-linear Basis Functions Legendre Polynomials 2015 11 05 133 136 https://ijnaa.semnan.ac.ir/article_262_9698eaf1127597152b3064bf956e6104.pdf
2015-10-29 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Subordination and Superordination Properties for Convolution Operator Samira Rahrovi In present paper a certain convolution operator of analytic functions is defined. Moreover, subordination and superordination- preserving properties for a class of analytic operators defined on the space of normalized analytic functions in the open unit disk is obtained. We also apply this to obtain sandwich results and generalizations of some known results. Analytic function Convolution operator Differential subordination Sandwich theorem 2015 10 29 137 147 https://ijnaa.semnan.ac.ir/article_264_d5d42119a5eecfb10a98a6d9f2ff43c4.pdf
2015-11-20 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 On Hilbert Golab-Schinzel type functional equation Mohamed Tial Driss Zeglami Samir Kabbaj Let \$X\$ be a vector space over a field \$K\$ of real or complex numbers. We will prove the superstability of the following Go{l}c{a}b-Schinzel type equation<br />\$\$<br />f(x+g(x)y)=f(x)f(y), x,yin X,<br />\$\$<br />where \$f,g:Xrightarrow K\$ are unknown functions (satisfying some assumptions). Then we generalize the superstability result for this equation with values in the field of complex numbers to the case of an arbitrary Hilbert space with the Hadamard product. Our result refers to papers by Chudziak and Tabor [J. Math. Anal. Appl. 302 (2005) 196-200], Jabl o'{n}ska [Bull. Aust. Math. Soc. 87 (2013), 10-17] and Rezaei [Math. Ineq. Appl., 17 (2014), 249-258]. Golab-Schinzel equation Superstability Hilbert valued function Hadamard product 2015 11 20 149 159 https://ijnaa.semnan.ac.ir/article_265_2fbd3ede87ca876ef5fffff27f63124b.pdf
2015-12-06 10.22075
International Journal of Nonlinear Analysis and Applications IJNAA 2015 6 2 Probabilistic analysis of the asymmetric digital search trees Ramin Kazemi Mohammad Vahidi-asl In this paper, by applying three functional operators the previous results on the (Poisson) variance of the external profile in digital search trees will be improved. We study the profile built over \$n\$ binary strings generated by a memoryless source with unequal probabilities of symbols and use a combinatorial approach for studying the Poissonized variance, since the probability distribution of the profile is unknown. Digital search tree profile functional operators Poisson variance 2015 12 06 161 173 https://ijnaa.semnan.ac.ir/article_266_11e8d7699d96813d58500f0aaf6c6fbf.pdf