2014
6
2
2
0
A NEW APPROACH OF FUZZY NUMBERS WITH DIFFERENT SHAPES AND DEVIATION
2
2
In this paper, we propose a new method for fuzzy numbers. In this method, we assume that Ai= (ai1, ai2, ai3, ai4) is to be a fuzzy number. So, the convex combination of ai1 and ai2 and also the convex combination of ai3 and ai4 are obtained separately. Then, Mic and Mis that are to be the convex combinations and the standard deviation respectively we acquire them from these components. Finally, we can obtain ranking index (Mi) that is the convex combination of, Mic and Mis. At the end of paper, in one example, the proposed method is compared with other methods.
1

730
736


A.
Ghanizadeh
Department of Statistics, Islamic Azad University of Kermanshah Branch,
Kermanshah, Iran
Department of Statistics, Islamic Azad University
Iran


N.
Parandin
Department of Mathematics, Islamic Azad University of Kermanshah Branch, Kermanshah, Iran
Department of Mathematics, Islamic Azad
Iran
Fuzzy number
convex combination
standard deviation
Unweighted pcenter problem on extended stars
2
2
An extended star is a tree which has only one vertex with degree larger than two. The center problem in a graph asks to find a subset of the vertices of of cardinality such that the maximum weighted distances from to all vertices is minimized. In this paper we consider the center problem on the unweighted extended stars, and present some properties to find solution.
1

737
744


Jafar
Fathali
Department of Mathematics, Shahrood University of Technology, University Blvd., Shahrood, Iran
Department of Mathematics, Shahrood University
Iran
fathali@shahroodut.ac.ir


Nader
Jafari Rad
Department of Mathematics, Shahrood University of Technology, University Blvd., Shahrood, Iran
Department of Mathematics, Shahrood University
Iran


Sadegh
Rahimi Sherbaf
Department of Mathematics, Shahrood University of Technology, University Blvd., Shahrood, Iran
Department of Mathematics, Shahrood University
Iran
Location theory
center problem
extended star
Application of G'/Gexpansion method to the (2+1)dimensional dispersive long wave equation
2
2
In this work G'/Gexpansion method has been employed to solve (2+1)dimensional dispersive long wave equation. It is shown that G'/Gexpansion method, with the help of symbolic computation, provides a very effective and powerful mathematical tool, for solving this equation.
1

745
752


Jafar
Biazar
Department of Mathematics, Faculty of Science, University of Guilan
Department of Mathematics, Faculty of Science,
Iran
jafar.biazar@gmail.com


Zainab
Ayati
Department of Mathematics, Faculty of Science, University of Guilan
Department of Mathematics, Faculty of Science,
Iran
G'/Gexpansion method
(2+1)dimensional dispersive long wave equation