]>
2011
3
1
100
EDGE Extension of Graphs and Digraphs
EDGE Extension of Graphs and Digraphs
en
en
In this paper, the concepts of edge (arc) extension of graphs (digraphs) and the edge
(arc) extensible class of graphs (digraphs) have been introduced. The classes of regular
and eulerian graphs (digraphs) which are not edge (arc) extensible classes have also
been introduced.
The concept of edge (arc) extensibility number has been introduced as well as the
characterization of extensibility number of regular graphs (digraphs). Also the
extensibility number of eulerian graphs (digraphs) has been characterized.
1
10
Akram B.
Attar
Joining graphs
Extension of graphs
Regular graphs
Reducibility
Contractibility
and Connectivity
Article.1.pdf
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]
Multiplicity Results for a Kirchho-type Doubly Eigenvalue Boundary Value Problem
Multiplicity Results for a Kirchho-type Doubly Eigenvalue Boundary Value Problem
en
en
This paper is concerned with the existence of at least three weak solutions to a class of
Kirchhoff-type doubly eigenvalue boundary value problem. The technical approach is mainly
based on a very recent three critical points theorem due to B. Ricceri [On a three critical
points theorem revisited, Nonlinear Anal., 70 (2009) 3084-3089.]
11
20
S.
Heidarkhani
G. A.
Afrouzi
Kirchhoff-type problem
Critical point
Three solutions
Variational methods.
Article.2.pdf
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[1]
G. A. Afrouzi, S. Heidarkhani, Three solutions for a quasilinear boundary value problem, Nonlinear Anal., 69 (2008), 3330-3336
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K. Perera, Z. Zhang, Nontrivial solutions of Kirchhoff-type problems via the Yang index, J. Differential Equations, 221 (2006), 246-255
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B. Ricceri , A further three critical points theorem, Nonlinear Anal., 71 (2009), 4151-4157
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B. Ricceri, A three critical points theorem revisited, Nonlinear Anal., 70 (2009), 3084-3089
##[16]
B. Ricceri, On a three critical points theorem, Arch. Math., 75 (2000), 220-226
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B. Ricceri, On an elliptic Kirchhoff-type problem depending on two parameters, J. Global Optimization, 46 (2010), 543-549
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Z. Zhang, K. Perera, Sign changing solutions of Kirchhoff type problems via invariant sets of descent flow, J. Math. Anal. Appl., 317 (2006), 456-463
]
On Behavior of Preconditioned Methods for a Class of Compact Finite Difference Schemes in Solution of Hyperbolic Equations
On Behavior of Preconditioned Methods for a Class of Compact Finite Difference Schemes in Solution of Hyperbolic Equations
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en
In this article, We apply Krylov subspace methods in combination of the ADI, BLAGE,...
method as a preconditioner for a class of linear systems arising from compact finite
difference schemes in solution of hyperbolic equations \(\alpha u_{tt}-\beta(X,t)u_{XX}=F(X,t,u,u_X,u_t)\)
subject to appropriate initial and Dirichlet boundary conditions, where \(\alpha\) is constant.
We show The BLAGE preconditioner is extremely effective in achieving optimal
convergence rates. Numerical results performed on model problem to confirm the
efficiency of our approach.
21
34
A.
Golbabai
M. M.
Arabshahi
Compact finite difference
Hyperbolic equations
Krylov subspace methods
Preconditioner.
Article.3.pdf
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]
A Dynamic Model for Pert Risk Evaluating in Fuzzy Environment
A Dynamic Model for Pert Risk Evaluating in Fuzzy Environment
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en
In this paper we propose a dynamic model for evaluating of time risk in stochastic network, where the activity durations are exponentionaly distributed random variable and independent. We would like to present a new definition of general risk index for project in each time and connect it to the notation of its activity criticalities. We model such networks as finite-state, absorbing, and continuous Marko chain with upper triangular generator matrices. The state space is related to the network structure. The criticality index for each activity will be computed and then we put forward a fuzzy way of measuring the criticality to computing project states criticality. Then by using the probability of absorption in each state severity of criticality will be computed dynamically. The criticality measure obtained may serve as a measure of risk or of the supervision effort needed by senior management. It also by ranking the states before project initiating is able to forecast the critical states in order and help to the project management to developing a proper guideline for resource planning and allocation.
35
52
Hossein
Mehrabadi
Dynamic PERT
dynamic risk management
fuzzy risk
markov chain
Article.4.pdf
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##[5]
S. M. T. Fatemi Ghomi, M. Rabbani, A new structural mechanism for reducibility of stochastic PERT networks, Eur. J. Oper. Res., 145 (2003), 394-402
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##[8]
A. Azaron, M. Modarres, Project Completion Time in Dynamic PERT Networks with Generating Projects, Scientia Iranica, 14 (2007), 56-63
##[9]
A. Azaron, H. Katagiri, K. Kato, M. Sakawa, Longest path analysis in networks of queues: Dynamic scheduling problems, Eur. J. Oper. Res., 174 (2006), 132-149
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A. I. Slyeptsov, T. A. Tyshchuk, Fuzzy temporal characteristics of operations for project management on the network models basis, Eur. J. Oper. Res., 147 (2003), 253-265
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D. Dubois, H. Fargier, V. Galvagnon, On latest starting times and floats in activity networks with ill-known durations, Eur. J. Oper. Res., 147 (2003), 266-280
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S. Chanas, D. Dubois, P. Zielinski, On the sure criticality of tasks in activity networks with imprecise durations, IEEE Trans. Syst. Man Cybernet. Part B: Cybernetics , 32 (2002), 393-407
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S. Chanas, P. Zielinski, Critical path analysis in the network with fuzzy activity times, Fuzzy Sets and Systems, 122 (2001), 195-204
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S. Chanas, P. Zielinski, The computational complexity of the criticality problems in a network with interval activity times, Eur. J. Oper. Res., 136 (2002), 541-550
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S. Chanas, P. Zielinski, On the hardness of evaluating criticality of activities in a planar network with duration intervals, Oper. Res. Lett., 31 (2003), 53-59
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H. J. Zimmermann, Fuzzy Set Theory and Its Applications, Springer, New York (2001)
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R. A. Bowman, Efficient Estimation of Arc Criticalities in Stochastic Activity Networks, Management Science, 41 (1995), 58-67
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S. E. Elmaghraby, Markov Activity Networks, http://www.ise.ncsu.edu/elmaghraby/Markov.pdf, September (1997)
]
Impact of International Market Entry Strategy on Export Performance
Impact of International Market Entry Strategy on Export Performance
en
en
With increasing levels of globalization and international competition, managers are facing ever more complex strategic decisions. Often, foremost among these are decisions relating to the choice of entry strategy in export markets. Selection of an appropriate entry strategy is a critical and indispensable component of the strategic decision a firm has to make when investing overseas. The present study has been implemented with the aim of examining the impact of entry strategy on export performance of Iranian export companies. In goals and nature of research, it is based on a Descriptive Study, and in collecting data, it is on the basis of a Survey Research. Its statistical population consists of active export companies in stock market. Based on the method of judgmental, non-probable sampling (experts’ choice), we chose 75 companies which cover 90 per cent of non-petroleum exports of the country as case study.
We collected the essential data through questionnaires. To analyze the data we used statistical methods of analyzing variance and regression of multi-variables. The study results depict that the entry strategy affects the export performance of the export companies. Also, the variable share of entry strategy in anticipation and changes in export performance of the export companies is approximately 48%.
53
70
Jamshid
Salehi Sadaghiani
Nabi Allah
Dehghan
Kambiz
Navabi Zand
entry strategy
export performance
Iranian export companies
Article.5.pdf
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[1]
G. S. Albaum, J. Strandskov, E. Duerr, International Marketing and Export Management, Prentice-Hall, 2002 (2002), 248-249
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O. Andersen, Internationalization and Market Entry Mode: A Review of Theories and Conceptual Frameworks, Management International Business Studies, 17 (1997), 1-26
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O. Andersen, A. Buvik , Firms’ internationalization and alternative approaches to the international customer/market selection, International Business Review., 11 (2002), 347-363
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J.-L. Arregle, L. Hébert, P. Beamish, Mode of international entry: the advantages of multilevel methods, Management International Review, 46 (2006), 597-618
##[5]
K. Brouthers, Institutional, cultural and transaction cost influences on entrymode choice and performance, Journal of International Business Studies, 33 (2002), 203-221
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K. Brouthers, J.-F. Hennart, Boundaries of the firm: insights from international entry mode research, Journal of Management, 33 (2007), 395-425
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N. A. Dehghan, A Model of Export Performance Improvement: The Effect of Strategic Fit between International Marketing Strategy and Organizational Contextual Dimensions and international marketing subsystems on Export Performance, Ph.D. Thesis (Faculty of business management, Allame Taba Tabaee University), Iran (2010)
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The web site of Trade Development Organization, www.tpo.ir, , (www.tpo.ir)
]
Linear System of Equations with Trapezoidal Fuzzy Numbers
Linear System of Equations with Trapezoidal Fuzzy Numbers
en
en
A general fuzzy linear system of equations is investigated using embedding
approach. In the literature of fuzzy systems two types of linear
systems are more important: 1) Fuzzy Linear Systems, 2) Fully Fuzzy
Linear Systems. In both class of these systems usually the authors considered
triangular type of fuzzy numbers. In this paper, we introduce a
linear system of equations with trapezoidal fuzzy numbers as an extension
of the fuzzy linear systems which was first introduced by Friedman
et al. [6]. Conditions for the existence of a trapezoidal fuzzy solution to
n×n linear system are derived and a numerical procedure for calculating
the solution is illustrated with some examples.
71
79
S. H.
Nasseri
M.
Gholami
Fuzzy linear system
Embedding approach
Triangular and trapezoidal fuzzy numbers
Trapezoidal fuzzy linear system.
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Solution of Mixed BVP Including a First Order Three Dimensional PDE with Nonlocal and Global Boundary Conditions
Solution of Mixed BVP Including a First Order Three Dimensional PDE with Nonlocal and Global Boundary Conditions
en
en
80
93
J.
Ebadpour
N.
Aliev
Mixed Problem
Nonlocal and global boundary conditions
Singularity
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On Positive Weak Solutions for Some Nonlinear Elliptic Boundary Value Problems Involving the p-Laplacian
On Positive Weak Solutions for Some Nonlinear Elliptic Boundary Value Problems Involving the p-Laplacian
en
en
This study concerns the existence of positive weak solutions to boundary value problems
of the form \[
\begin{cases}
-\Delta_{p}u=g(x,u),\,\,\,\,\, x\in \Omega,\\
u(x)=0,\,\,\,\,\, x\in \partial \Omega,
\end{cases}
\]
where \(\Delta_{p}\) is the so-called p-Laplacian operator i.e. \(\Delta_pz=div(|\nabla z|^{p-2} \nabla z), p>1,\Omega\) is a
smooth bounded domain in \(R^N(N\geq 2)\) with \(\partial \Omega\) of class \(C^2\); and connected, and \(g(x; 0) < 0\)
for some \(x\in \Omega\) (semipositone problems). By using the method of sub-super solutions we
prove the existence of the positive weak solution to special types of \(g(x; u)\).
94
101
S. H.
Rasouli
G. A.
Afrouzi
J.
Vahidi
Positive weak solutions
p-Laplacian
sub-super solution
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