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shahvelayati--roozbeh
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Sedimentation Investigation and Numerical Analysis of Dredging Trailing Disposal
, M.Sc. Thesis Sharif University of Technology ; Abbaspour Tehrani Fard, Madjid (Supervisor) ; Khorasanchi, Mahdi (Supervisor)
Abstract
every year large amounts of sedimentation are getting dredged all over the world. Dredging operation includes several processes such as excavating from the sea bottom, transferring them to the surface, and most important, releasing them in another area which can cause a sediment particle cloud that can be really harmful to the surrounding environment. Therefore, accurate analysis of this phenomenon is necessary to prevent catastrophic damages. The Eulerian-Lagrangian numerical method considers both sediment particles and fluid physics for a better simulation of near-field area. In this project, after investigating open-source available software for the Eulerian-Lagrangian simulation, a new...
A fuzzy vendor managed inventory of multi-item economic order quantity model under shortage: An ant colony optimization algorithm
, Article International Journal of Production Economics ; Vol. 155 , September , 2014 , pp. 259-271 ; Hemmati Far, M ; Akhavan Niaki, S. T ; Sharif University of Technology
2014
Abstract
In this study, a multi-item economic order quantity model with shortage under vendor managed inventory policy in a single vendor single buyer supply chain is developed. This model explicitly includes warehouse capacity and delivery constraints, bounds order quantity, and limits the number of pallets. Not only the demands are considered imprecise, but also resources such as available storage and total order quantity of all items can be vaguely defined in different ways. An ant colony optimization is employed to find a near-optimum solution of the fuzzy nonlinear integer-programming problem with the objective of minimizing the total cost of the supply chain. Since no benchmark is available in...
A hybrid genetic and imperialist competitive algorithm for green vendor managed inventory of multi-item multi-constraint EOQ model under shortage
, Article Applied Soft Computing Journal ; Volume 30 , May , 2015 , Pages 353-364 ; 15684946 (ISSN) ; Hemmati Far, M ; Akhavan Niaki, S. T ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
The purpose of this paper is to develop a multi-item economic order quantity (EOQ) model with shortage for a single-buyer single-supplier supply chain under green vendor managed inventory (VMI) policy. This model explicitly includes the VMI contractual agreement between the vendor and the buyer such as warehouse capacity and delivery constraints, bounds for each order, and limits on the number of pallets. To create a kind of green supply chain, tax cost of green house gas (GHG) emissions and limitation on total emissions of all items are considered in the model. A hybrid genetic and imperialist competitive algorithm (HGA) is employed to find a near-optimum solution of a nonlinear...
An investigation of vendor-managed inventory application in supply chain: The EOQ model with shortage
, Article International Journal of Advanced Manufacturing Technology ; Volume 49, Issue 1-4 , July , 2010 , Pages 329-339 ; 02683768 (ISSN) ; Akhavan Niaki, S. T ; Roozbeh Nia, A ; Sharif University of Technology
2010
Abstract
Recent researches have shown the importance of improving the supply chain competitiveness by means of strategic alliances. This study considers the retailer-supplier partnership through a vendor-managed inventory (VMI) system and develops an analytical model to explore the effect of important supply chain parameters on the cost savings realized from collaborative initiatives. This model is developed for a two-level supply chain consisting of a single supplier and a single retailer and examines the inventory management practices before and after implementation of VMI. The results of analytical examination show that VMI implementation in economic order quantity model when shortage is...
Generation, Propagation and Domination in Graphs
, M.Sc. Thesis Sharif University of Technology ; Mahmoodian, Ebadollah (Supervisor) ; Tusserkani, Roozbeh (Supervisor)
Abstract
In this thesis, we discuss some basic concepts of graph theory and introduce some well-known graphs with a glimpse at the optimization concepts. We also have discussed the proof of theorems related with the domination sets and total domination sets. Indeed, let G = (V;E) be a graph with no isolated vertex. A subset of V , S is a domination set if every vertex in V n S is adjacent to at least one vertex in S. Also, a subset of V , S is a total domination set if every vertex in V is adjacent to at least one vertex in S. Generation and propagation codes that is introduced by R.Touserkani is one of the objects in this thesis, that we study and discuss. Also, for some classes of graphs, we...