2019-07-21T13:16:19+04:30
http://ijmsi.ir/browse.php?mag_id=24&slc_lang=en&sid=1
24-546
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
On Prime and Semiprime Ideals in Ordered AG-Groupoids
P.
Yiarayong
pairote0027@hotmail.com
The aim of this short note is to introduce the concepts of prime and semiprime ideals in ordered AG-groupoids with left identity. These concepts are related to the concepts of quasi-prime and quasi-semiprime ideals, play an important role in studying the structure of ordered AG-groupoids, so it seems to be interesting to study them.
Ordered AG-Groupoids
Prime
Semiprime
quasi-prime
quasi-semiprime.
2017
4
01
1
11
http://ijmsi.ir/article-1-546-en.pdf
DOI: 10.7508/ijmsi.2017.01.001
24-467
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
Modeling Dynamic Production Systems with Network Structure
F.
Koushki
fkoushki@gmail.com
This paper deals with the problem of optimizing two-stage structure decision making units (DMUs) where the activity and the performance of two-stage DMU in one period effect on its efficiency in the next period. To evaluate such systems the effect of activities in one period on ones in the next term must be considered. To do so, we propose a dynamic DEA approach to measure the performance of such network units. According to the results of proposed dynamic model the inefficiencies of DMUs improve considerably. Additionally, in models which measure efficiency score, undesirable outputs are mostly treated as inputs, which do not reflect the true production process. We propose an alternative method in dealing with bad outputs. Statistical analysis of sub-efficiencies, i.e. efficiency score of each stage, during all periods represents useful information about the total performance of the stage over all periods.
Data envelopment analysis (DEA)
Network DEA
Bad outputs
Dynamic DEA
Sub-efficiency.
2017
4
01
13
26
http://ijmsi.ir/article-1-467-en.pdf
DOI: 10.7508/ijmsi.2017.01.002
24-593
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
A Note on Twists of (y^2=x^3+1)
F.
Izadi
farzali.izadi@azaruniv.edu
A.
Shamsi Zargar
shzargar.arman@azaruniv.edu
In the category of Mordell curves (E_D:y^2=x^3+D) with nontrivial torsion groups we find curves of the generic rank two as quadratic twists of (E_1), and of the generic rank at least two and at least three as cubic twists of (E_1). Previous work, in the category of Mordell curves with trivial torsion groups, has found infinitely many elliptic curves with rank at least seven as sextic twists of (E_1) cite{Kih}.
Elliptic curve
Mordell curve
(Mordell-Weil) rank
Twist.
2017
4
01
27
34
http://ijmsi.ir/article-1-593-en.pdf
DOI: 10.7508/ijmsi.2017.01.003
24-669
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
Graph Convergence for H(.,.)-co-Accretive Mapping with over-Relaxed Proximal Point Method for Solving a Generalized Variational Inclusion Problem
M.
Rahaman
mrahman96@yahoo.com
R.
Ahmad
raisain_123@rediffmail.com
H. A.
Rizvi
haider.alig.abbas@gmail.com
In this paper, we use the concept of graph convergence of H(.,.)-co-accretive mapping introduced by [R. Ahmad, M. Akram, M. Dilshad, Graph convergence for the H(.,.)-co-accretive mapping with an application, Bull. Malays. Math. Sci. Soc., doi: 10.1007/s40840-014-0103-z, 2014$] and define an over-relaxed proximal point method to obtain the solution of a generalized variational inclusion problem in Banach spaces. Our results can be viewed as an extension of some previously known results in this direction.
Graph convergence
Over-relaxed
Accretive
Variational inclusion
Convergence.
2017
4
01
35
46
http://ijmsi.ir/article-1-669-en.pdf
DOI: 10.7508/ijmsi.2017.01.004
24-595
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
Integrating Differential Evolution Algorithm with Modified Hybrid GA for Solving Nonlinear Optimal Control Problems
S.
Nezhadhosein
s_nezhadhossin@yahoo.com
A.
Heydari
R.
Ghanbari
Here, we give a two phases algorithm based on integrating differential evolution (DE) algorithm with modified hybrid genetic algorithm (MHGA) for solving the associated nonlinear programming problem of a nonlinear optimal control problem. In the first phase, DE starts with a completely random initial population where each individual, or solution, is a random matrix of control input values in time nodes. After phase 1, to achieve more accurate solutions, we increase the number of time nodes. The values of the associated new control inputs are estimated by linear or spline interpolations using the curves computed in the phase 1. In addition, to maintain the diversity in the population, some additional individuals are added randomly. Next, in the second phase, MHGA starts by the new population constructed by the above procedure and tries to improve the obtained solutions at the end of phase 1. We implement our proposed algorithm on some well-known nonlinear optimal control problems. The numerical results show the proposed algorithm can find almost better solution than other proposed algorithms.
Nonlinear optimal control problem
Differential evolution
Modified hybrid genetic algorithm
Successive quadratic programming
Spline interpolation.
2017
4
01
47
67
http://ijmsi.ir/article-1-595-en.pdf
DOI: 10.7508/ijmsi.2017.01.005
24-617
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
Some Families of Graphs whose Domination Polynomials are Unimodal
S.
Alikhani
alikhani@yazd.ac.ir
S.
Jahari
s.jahari@gmail.com
Let $G$ be a simple graph of order $n$. The domination polynomial of $G$ is the polynomial $D(G, x)=sum_{i=gamma(G)}^{n} d(G,i) x^{i}$, where $d(G,i)$ is the number of dominating sets of $G$ of size $i$ and $gamma(G)$ is the domination number of $G$. In this paper we present some families of graphs whose domination polynomials are unimodal.
Domination polynomial
unimodal
family.
2017
4
01
69
80
http://ijmsi.ir/article-1-617-en.pdf
DOI: 10.7508/ijmsi.2017.01.006
24-626
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
On Lorentzian two-Symmetric Manifolds of Dimension-four
A.
Zaeim
zaeim@pnu.ac.ir
M.
Chaichi
chaichi@pnu.ac.ir
Y.
Aryanejad
y.aryanejad@pnu.ac.ir
We study curvature properties of four-dimensional Lorentzian manifolds with two-symmetry property. We then consider Einstein-like metrics, Ricci solitons and homogeneity over these spaces.
Pseudo-Riemannian metric
Einstein-like metrics
Ricci soliton
Homogeneous space.
2017
4
01
81
94
http://ijmsi.ir/article-1-626-en.pdf
DOI: 10.7508/ijmsi.2017.01.007
24-632
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
On the Zero-divisor Cayley Graph of a Finite Commutative Ring
A. R.
Naghipour
Let R be a fnite commutative ring and N(R) be the set of non unit elements of R. The non unit graph of R, denoted by Gamma(R), is the graph obtained by setting all the elements of N(R) to be the vertices and defning distinct vertices x and y to be adjacent if and only if x - yin N(R). In this paper, the basic properties of Gamma(R) are investigated and some characterization results regarding connectedness, girth and planarity of Gamma(R) are given.
Connectivity
diameter
girth
planar graph
clique.
2017
4
01
95
106
http://ijmsi.ir/article-1-632-en.pdf
DOI: 10.7508/ijmsi.2017.01.008
24-743
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
On Open Packing Number of Graphs
I.
Sahul Hamid
S.
Saravanakumar
In a graph G = (V,E), a subset $S⊂V$ is said to be an open packing set if no two vertices of S have a common neighbour in G. The maximum cardinality of an open packing set is called the open packing number and is denoted by $ρ^{o}$. This paper further studies on this parameter by obtaining some new bounds.
Open packing
Maximum degree
Clique
Split graphs.
2017
4
01
107
117
http://ijmsi.ir/article-1-743-en.pdf
DOI: 10.7508/ijmsi.2017.01.009
24-638
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
On Twin--Good Rings
N.
Ashrafi
nashrafi@semnan.ac.ir
N.
Pouyan
neda.pouyan@gmail.com
In this paper, we investigate various kinds of extensions of twin-good rings. Moreover, we prove that every element of an abelian neat ring R is twin-good if and only if R has no factor ring isomorphic to Z2 or Z3. The main result of [24] states some conditions that any right self-injective ring R is twin-good. We extend this result to any regular Baer ring R by proving that every element of a regular Baer ring is twin-good if and only if R has no factor ring isomorphic to Z2 or Z3. Also we illustrate conditions under which extending modules, continuous modules and some classes of vector space are twin-good.
Twin-good ring
Neat ring
Regular Baer ring
π-regular.
2017
4
01
119
129
http://ijmsi.ir/article-1-638-en.pdf
DOI: 10.7508/ijmsi.2017.01.010
24-671
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
An Interior Point Algorithm for Solving Convex Quadratic Semidefinite Optimization Problems Using a New Kernel Function
M. R.
Peyghami
peyghami@kntu.ac.ir
S.
Fathi Hafshejani
sajadfathi85@gmail.com
In this paper, we consider convex quadratic semidefinite optimization problems and provide a primal-dual Interior Point Method (IPM) based on a new kernel function with a trigonometric barrier term. Iteration complexity of the algorithm is analyzed using some easy to check and mild conditions. Although our proposed kernel function is neither a Self-Regular (SR) function nor logarithmic barrier function, the primal-dual IPMs based on this kernel function enjoy the worst case iteration bound $Oleft(sqrt{n}log nlog frac{n}{epsilon}right)$ for the large-update methods with the special choice of its parameters. This bound coincides to the so far best known complexity results obtained from SR kernel functions for linear and semidefinite optimization problems. Finally some numerical issues regarding the practical performance of the new proposed kernel function is reported.
Convex quadratic semidefinite optimization problem
Primal-dual interior-point methods
Kernel function
Iteration complexity.
2017
4
01
131
152
http://ijmsi.ir/article-1-671-en.pdf
DOI: 10.7508/ijmsi.2017.01.011
24-918
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
On Graded Weakly Classical Prime Submodules
R.
Abu-Dawwas
rrashid@yu.edu.jo
Kh.
Al-Zoubi
kfzoubi@ust.edu.jo
Let R be a G-graded ring and M be a G-graded R-module. In this article, we introduce the concept of graded weakly classical prime submodules and give some properties of such submodules.
Graded prime submodules
Graded weakly classical prime submodules
Graded classical prime submodules .
2017
4
01
153
161
http://ijmsi.ir/article-1-918-en.pdf
DOI: 10.7508/ijmsi.2017.01.012
24-1114
2019-07-21
10.1002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2017
12
1
ABSTRACTS IN PERSIAN Vol.12, No.1
Name of Authors In This Volume
fatemeh.bardestani@gmail.com
Please see the full text contains the Pesian abstracts for this volume.
ABSTRACTS
PERSIAN
Vol. 12
No. 1
2017
4
01
163
175
http://ijmsi.ir/article-1-1114-en.pdf
DOI: 10.7508/ijmsi.2017.01.013