نتایج جستجو برای: a stochastic multi

تعداد نتایج: 13551486  

Since most real-world decision problems, because of incomplete information or the existence of linguistic information in the data are including uncertainties. Stochastic programming and fuzzy programming as two conventional approaches to such issues have been raised. Stochastic programming deals with optimization problems where some or all the parameters are described by stochastic variables. I...

Journal: :مدیریت صنعتی 0
علیرضا شریفی سلیم دانشجوی دکتری، مدیریت صنعتی، دانشکدۀ مدیریت، دانشگاه تهران، تهران، ایران منصور مومنی استاد، مدیریت صنعتی، دانشکدۀ مدیریت، دانشگاه تهران، تهران، ایران محمد مدرس یزدی استاد، مهندسی صنایع، دانشکدۀ مهندسی صنایع، دانشگاه صنعتی شریف، تهران، ایران رضا راعی استاد، مدیریت مالی، دانشکدۀ مدیریت، دانشگاه تهران، تهران، ایران

in traditional portfolio selection model coefficients often are certain and deterministic, but in real world these coefficients are probabilistic. so decision maker cannot estimate them exactly. financial optimization is one of the most attractive areas in decision under uncertainty. in the portfolio selection problem the decision maker considers simultaneously conflicting objectives such as ra...

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Design of a logistics network in proper way provides a proper platform for efficient and effective supply chain management. This paper studies a multi-period, multi echelon and multi-product integrated forward-reverse logistics network under uncertainty. First, an efficient complex mixed-integer linear programming (MILP) model by considering some real-world assumptions is developed for the inte...

Journal: :international journal of civil engineering 0
f. amini r. vahdani

in this research, an innovative numerical simulating approach for time domain analysis of multi degrees of freedom structures with uncertainty in dynamic properties is presented. a full scale finite element model of multi-story and multi bays of three sample structures has been constructed. the reduced order model of structure with holding the dominant and effective gramians in the balanced sta...

In this research, we address the application of uncertaintyprogramming to design a multi-site, multi-product, multi-period,closed-loop supply chain (CLSC) network. In order to make theresults of this article more realistic, a CLSC for a case study inthe iron and steel industry has been explored. The presentedsupply chain covers three objective functions: maximization ofprofit, minimization of n...

Journal: :journal of linear and topological algebra (jlta) 0
r farnoosh school of mathematics, iran university of science and technology, 16844, tehran, iran. h rezazadeh school of mathematics, iran university of science and technology, 16844, tehran, iran. a sobhani school of mathematics, iran university of science and technology, 16844, tehran, iran. d ebrahimibagha department of mathematics, center branch, islamic azad university, tehran, iran.

in this paper, we present the numerical solution of ordinary di erential equations (or sdes), from each order especially second-order with time-varying and gaussian random coecients. we indicate a complete analysis for second-order equations in special case of scalar linear second-order equations (damped harmonic oscillators with additive or multi- plicative noises). making stochastic di erent...

‎In this paper we establish a new numerical method for solving a class of stochastic partial differential equations (SPDEs) based on B-splines wavelets‎. ‎The method combines implicit collocation with the multi-scale method‎. Using the multi-scale method‎, ‎SPDEs can be solved on a given subdomain with more accuracy and lower computational cost than the rest of the domain‎. ‎The stability and c...

In this paper a multi-period inventory control problem will be analyzed. Periodic replenishment will happen totally stochastic and also the periods between two replenishments are independent and identically distributed random variables .indeed producer is encountered with customer in stochastic time.  Also the decision variable has been chosen as an integer. In first model shortage will be back...

This paper presents a multi-objective simulated annealing algorithm for the mixed-model assembly line balancing with stochastic processing times. Since, the stochastic task times may have effects on the bottlenecks of a system, maximizing the weighted line efficiency (equivalent to the minimizing the number of station), minimizing the weighted smoothness index and maximizing the system reliabil...

Journal: :iranian journal of science and technology (sciences) 2011
m. bagherpour

in this research, both resource allocation and reactive resource allocation problems in multi-server dynamic pert networks are analytically modeled, where new projects are expected to arrive according to a poisson process, and activity durations are also known as independent random variables with exponential distributions. such system is represented as a queuing network, where multi servers at ...

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