Search for: supply-chain
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    Coordinating a seller-buyer supply chain with a proper allocation of chain’s surplus profit using a general side-payment contract [electronic resource]

    , Article International Journal of Industrial and Systems Engineering ; Volume 5, No. 2, Summer 2011, Page 63-79 Masihabadi, S. (Sina) ; Eshghi, Kourosh ; Sharif University of Technology
    In this paper, seller-buyer supply chain coordination with general side-payment contracts is introduced to gain the maximum possible chain profit. In our model, the logistics costs for both buyer and seller are considered and the final demand is also supposed to be a decreasing function of the retail price. Since parties aim to maximize their individual profits, the contractual parameters are set in a way that these decisions become aligned with system optimal decisions. Therefore, a side payment contract is suggested in our model to assign the chain surplus profit to the chain members such that they have no intention to leave the coalition. Then, we change the contract into a quantity... 

    One-for-one period policy and a series of suppliers

    , Article 2009 International Conference on Computers and Industrial Engineering, CIE 2009, 6 July 2009 through 9 July 2009, Troyes ; 2009 , Pages 902-906 ; 9781424441365 (ISBN) Haji, R ; Pirayesh Neghab, M ; Haji, A ; Sharif University of Technology
    The purpose of this paper is to adopt and analyze a new ordering policycalled one-for-one-period policy in a multi-echelon supply chain consisting ofone retailer and a series of TV suppliers. The main advantage of adopting theone-for-one-period (7,7) ordering policy for retailers is the elimination ofuncertainty for supplier which leads to total elimination of the safety stocksat all suppliers. This in turn leads to the reduction of the total system costsand in case any supplier's ordering cost is negligible it can even eliminate theneed for him to carry any inventory. In addition to this advantage, thenumerical results show that the application of this new policy for the retailerleads to... 

    Water and emissions nexus for biodiesel in Iran

    , Article Renewable and Sustainable Energy Reviews ; Volume 93 , 2018 , Pages 354-363 ; 13640321 (ISSN) Haj Hasan, A ; Avami, A ; Sharif University of Technology
    Biodiesel is an attractive renewable energy in Iran. However, the concerns for food security, emissions, and water requirement move us towards developing the analytical framework to study emission-water nexus of biodiesel via the multi objective sustainable planning of biodiesel supply chain. Here, the literature of biodiesel in Iran is comprehensively reviewed and main issues are discussed. Then, a supply chain planning model is applied to depict the optimal path ways to minimize costs, net emission, and water use in Iran during 25 years. The microalgae via open ponds and jatropha cultivation reduce the total costs and improve negative emissions. The jatropha optimizes the water use and... 

    Vendor-managed inventory in the joint replenishment problem of a multi-product single-supplier multiple-retailer supply chain: A teacher-learner-based optimization algorithm

    , Article Journal of Modelling in Management ; Volume 13, Issue 1 , 2018 , Pages 156-178 ; 17465664 (ISSN) Pasandideh, S. H. R ; Akhavan Niaki, S. T ; Ahmadi, P ; Sharif University of Technology
    Emerald Group Publishing Ltd  2018
    Purpose: In this paper, the joint replenishment problem is modeled for a two-level supply chain consisting of a single supplier and multiple retailers that use the vendor-managed inventory (VMI) policy for several products. This paper aims to find the optimal number of products to order in both policies, the optimal times at which each retailer orders the products in the traditional policy and the optimal times at which the supplier orders the product in the VMI policy. Design/methodology/approach: The problem is first formulated into the framework of a constrained integer nonlinear programming model; then, the problem is solved using a teacher-learner based optimization algorithm. As there... 

    Designing a dynamic buyer-supplier coordination model in electronic markets using stochastic petri nets

    , Article International Journal of Information Systems and Supply Chain Management ; Volume 1, Issue 3 , 2008 , Pages 1-20 ; 19355726 (ISSN) Mahdavi, I ; Mohebbi, S ; Cho, N ; Paydar, M. M ; Mahdavi Amiri, N ; Sharif University of Technology
    Functional relationship between supplier and buyer in an open market place leads to investigate the role of both quantifiable and non-quantifiable parameters in coordination mechanism with the aim of achieving higher performance in supply chain activities. Here, we develop a supply chain model and a new agent to analyze and simulate the players' behavior in the network. A cooperative game theory framework is utilized between buyer and supplier in order to increase the supply chain performance. The study is supported by presenting SC Net Optimizer as a tool for implementing the proposed coordination mechanism and evaluates the performance of the chain by simulation using stochastic Petri nets... 

    An optimal lot sizing and pricing planning in two-echelon supply chain

    , Article International Journal of Industrial Engineering Computations ; Volume 1, Issue 1 , Summer , 2010 , Pages 11-32 ; 19232926 (ISSN) Naeij, J ; Shavandi, H ; Sharif University of Technology
    This paper studies inventory and pricing policies in a non-cooperative supply chain with one supplier and several retailers who are involved in producing, delivering and selling a single product. We consider inventory policies in an information-asymmetric vendor managed inventory. The study consists of different scenarios where a supplier produces the product at the wholesale price to multiple retailers. The retailers also distribute the product in dispersed and independent markets at retail selling prices. The demand rate for each market is a non- decreasing concave function of the marketing expenditures of both local retailers and the manufacturer, but a non-increasing and convex function... 

    A green closed-loop supply chain network: A bi-objective mixed integer linear programming model

    , Article International Journal of Operational Research ; Volume 41, Issue 4 , 2021 , Pages 492-513 ; 17457645 (ISSN) Gholipour, S ; Salehian, F ; Lamouchi, H ; Mina, H ; Sharif University of Technology
    Inderscience Publishers  2021
    The increasing level of customer awareness and application of environmental laws by governments, on the one hand, and the increasing number of competitors, on the other hand, has obliged industry owners to include green activities in the design of the supply chain network. Green activities include any type of action that reduces environmental degradation. Hence, this study seeks to develop a bi-objective, mixed integer linear programming (MILP) model for designing a green supply chain network. In the proposed model, the minimisation of costs and detrimental environmental effects are discussed. LP metric method is used to solve the bi-objective model and the proposed model is run by using... 

    Queueing system with inventory for two-echelon supply chain

    , Article 2009 International Conference on Computers and Industrial Engineering, CIE 2009, 6 July 2009 through 9 July 2009, Troyes ; 2009 , Pages 835-838 ; 9781424441365 (ISBN) Saffari, M ; Haji, R ; Sharif University of Technology
    In this paper a two-echelon supply chain consisting of a supplier and aretailer is considered, Customers refer to retailer according to a Poissonprocess and retailer uses one for one inventory policy. Supplier followscontinuous review (r,Q) policy. Satisfying each demand which arrives to thesupplier needs an on hand-inventory and a process/service. Process/service andreplenishment lead times are random variables which are exponentiallydistributed. During a period that supplier has non zero on-hand inventory,arriving demands from retailer join the queue. But when supplier has no on-handinventory retailer buys product from the other source with zero lead time andadditional cost. In this paper... 

    Analyzing the supply chain using SCOR model in a steel producing company

    , Article 40th International Conference on Computers and Industrial Engineering, 25 July 2010 through 28 July 2010 ; 2010 ; 9781424472956 (ISBN) Seifbarghy, M ; Akbari, M. R ; Ssheikh Sajadieh, M ; Sharif University of Technology
    Supply Chain Operations Reference (SCOR) model is developed and maintained by the Supply Chain Council (SCC). The model is a reference model which can be used to map, benchmark and improve the supply chain operations. SCOR model provides companies with a basic process modeling tool, an extensive benchmark database and defines a set of supply chain metrics. Mobarakeh Steel Company (located in Isfahan, Iran) initiated the project of studying and analyzing its supply chain performance based on the SCOR model. This paper explains the steps and the results of the project. Interviews with the managers and considering the documents on the four major subjects of planning, logistics, information flow... 

    Exact evaluation of a two sourcing supply chain with order splitting and information sharing

    , Article 2008 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2008, Singapore, 8 December 2008 through 11 December 2008 ; 2008 , Pages 1835-1839 ; 9781424426300 (ISBN) Sajadifar, M ; Hendi, A. M ; Haji, R ; Sharif University of Technology
    We consider a single item, two-level inventory system which consisting of two suppliers and one retailer. Transportation times are constant. The retailer faces Poisson demands and applies continuous (R,Q) policy. Each supplier starts with m initial batches of size Q/2 and places an order in a batch of size Q/2 to an outside source immediately after the retailer's inventory position reaches R+s. In this paper using the idea of the one-for-one ordering policy, we derive the exact value of the expected total cost in the convergent coordinated supply chain. © 2008 IEEE  

    Studying and Comparing Agile and Lean Supply Chain Models and Determining the Optimum Model Using Genetic Algorithm

    , M.Sc. Thesis Sharif University of Technology Daei, Mohammad (Author) ; Ghasemi, Farhad (Supervisor)
    As you know in lean supply chains, it is tried to: reduce the wastes of resources and achieve more production with lower consumption of resources. This system is very well suited for many supply chains in which the final determinant factors are price and quality. In contrast, recently, the concept of agile supply chain has been introduced, insisting on flexibility and high service level. Opposite to lean supply chain, agile supply chain needs safety stock to be able to respond to market’s changes.
    Regarding the dissimilarities of these models –including the disagreement in the allocation of safety stock to nodes– In this thesis, in addition to studying and comparing these two approaches,... 

    Sole versus dual-sourcing under order dependent lead-times and prices [electronic resource]

    , Article Computers And Operations Research, Published in: Elsevier Journals ; Volume 36, Issue 12, December 2009, Pages 3272–3280 Sajjadieh, M. (Mohsen) ; Eshghi, Kourosh ; Sharif University of Technology
    In this paper, we consider a dual-sourcing model with constant demand and stochastic lead times. Two suppliers may be different in terms of purchasing prices and lead-time parameters. The ordering takes place when the inventory level depletes to a reorder level, and the order is split among two suppliers. Unlike previous works in the order splitting literature, the supply lead time between vendor and buyer as well as unit purchasing prices is considered to be order quantity dependent. The proposed model finds out the optimal reorder point, order quantity and splitting proportion, using a solution procedure. Numerical results show that neglecting the relationship between ordering batch size... 

    Integrated procurement, production, and delivery scheduling in a generalized three stage supply chain [electronic resource]

    , Article International Journal of Industrial and Systems Engineering (JISE)-Iranian Institute of Industrial Engineering ; 2009, Vol. 3, No. 3, pp. 189-212 Nikandish, N. (Nasser) ; Eshghi, Kourosh ; Torabi, S. Ali ; Sharif University of Technology
    In this research, we investigate a three-stage supply chain with one supplier, several manufacturers and multiple retailers where the supplier provides a common raw material to each manufacturer, who in turn uses a single stage production facility to convert it into final products that are delivered at fixed lot sizes to retailers. An integrated economic procurement, production, and delivery model is developed whose objective is to find the common production cycle length, production sequences of final products at manufacturers and delivery frequencies of final products to retailers minimizing the total costs of considered supply chain. We propose an analytical solution procedure and an... 

    Strategies for protecting supply chain networks against facility and transportation disruptions: An improved Benders decomposition approach

    , Article Annals of Operations Research ; Volume 210, Issue 1 , 2013 , Pages 125-163 ; 02545330 (ISSN) Azad, N ; Saharidis, G. K. D ; Davoudpour, H ; Malekly, H ; Yektamaram, S. A ; Sharif University of Technology
    Disruptions rarely occur in supply chains, but their negative financial and technical impacts make the recovery process very slow. In this paper, we propose a capacitated supply chain network design (SCND) model under random disruptions both in facility and transportation, which seeks to determine the optimal location and types of distribution centers (DC) and also the best plan to assign customers to each opened DC. Unlike other studies in the extent literature, we use new concepts of reliability to model the strategic behavior of DCs and customers at the network: (1) Failure of DCs might be partial, i.e. a disrupted DC might still be able to serve with a portion of its initial capacity (2)... 

    Evaluation of marketing-pricing decisions in a two-echelon supply chain

    , Article Engineering Economics ; Volume 24, Issue 2 , 2013 , Pages 135-143 ; 13922785 (ISSN) Alaei, S ; Behravesh, M ; Karegar, N ; Sharif University of Technology
    Kauno Technologijos Universitetas  2013
    This paper discusses the interaction between one manufacturer and a single retailer in a channel in which both are willing to optimize their profit by adjusting pricing and advertising decisions. The manufacturer produces and sells a product at wholesale price to the retailer who in turn distributes it to consumers with retail price. The market demand is simultaneously affected by retail price, brand advertising of the manufacturer, and local advertising of the retailer. A Cobb-Douglas demand function is used to demonstrate the relationship between the parameters. Decision variables are two firms’ prices and their advertising investments. The problem is modelled under integrated policy and... 

    Flexibility analysis of a supply chain using design structure matrix

    , Article Gain Competitive Advantage by Managing Complexity - Proceedings of the 14th International Dependency and Structure Modelling Conference, DSM 2012, 13 September 2012 through 14 September 2012 ; September , 2012 , Pages 79-88 ; 9783446433540 (ISBN) Yousefi, Z ; Malaek, S. M. B ; Emamipour, S ; Sharif University of Technology
    Institution of Engineering Designers  2012
    Now days supply chain systems operate in an operational environment with high uncertainty. Customer globalization, increase of natural and manmade disasters, outsourcing in far distances have increased uncertainty. Flexibility as a capability can help systems included supply chains respond to uncertainty and deliver value to their users. auto supply chain is the one that has suffered from these disasters. This paper encapsulates operational environment uncertainty through scenario development, then scores the scenarios based on some proxies. Design structure matrix is proposed to show the typical auto supply chain relationships before scenario occurring consequences and after that. in the... 

    A grid-based collaborative supply chain with multi-product multi-period production-distribution

    , Article Enterprise Information Systems ; Volume 6, Issue 1 , 2012 , Pages 115-137 ; 17517575 (ISSN) Sepehri, M ; Sharif University of Technology
    A collaborative supply chain seeks to coordinate its members to produce and distribute products along the chain for minimum overall costs to satisfy customer demand. An integrated multi-period, multi-product and multi-stage supply chain model is developed. A collaborative supply chain grid (CSCG) system gathers necessary information on operations and resources from members of the supply chain. It then guides the members on ordering decisions for a minimum overall cost, while continuously re-directing them as new data becomes available. An actual CSCG system has been implemented in a collaborative auto industry with diverse and dynamic membership, yielding an approximately 26% reduction in... 

    New replenishment policy for deterioration items in green supply chain

    , Article 62nd IIE Annual Conference and Expo 2012, 19 May 2012 through 23 May 2012 ; May , 2012 , Pages 2516-2525 Sazvar, Z ; Mirzapour Al-E-hash, S. M. J ; Baboli, A ; Jokar, M. R. A ; Botta-Genoulaz, V ; ; Sharif University of Technology
    Institute of Industrial Engineers  2012
    Many developed models for deterioration items considered only costs related to inventories. Recently consumers and legislation have pushed companies to design their activities in order to reduce more and more the negative environmental impacts. Thus, it is important to examine the optimization of total supply chain costs and environmental impacts together. However, because of the recycling of the deteriorated items, the environmental impacts of supplying deterioration items are more significant than the non-deterioration products. The objective of this paper is developing a mathematical model and proposing a new replenishment policy in a centralized supply chain for deterioration items. In... 

    Equilibrium pricing and ordering policies in a two-echelon supply chain in the presence of strategic customers

    , Article Anais da Academia Brasileira de Ciencias ; Volume 88, Issue 2 , 2016 , Pages 1127-1150 ; 00013765 (ISSN) Sadjadi, S. J ; Naeij, J ; Shavandi, H ; Makui, A ; Sharif University of Technology
    This paper studying the impact of strategic customer behavior on decentralized supply chain gains and decisions, which includes a supplier, and a monopoly firm as a retailer who sells a single product over a finite two periods of selling season. We consider three types of customers: myopic, strategic and low-value customers. The problem is formulated as a bi-level game where at the second level (e.g. horizontal game), the retailer determines his/her equilibrium pricing strategy in a non-cooperative simultaneous general game with strategic customers who choose equilibrium purchasing strategy to maximize their expected surplus. At the first level (e.g. vertical game), the supplier competes... 

    Representing a Mathematical Model to Determine the Optimal Policy for a Seller-Buyer Supply Chain

    , M.Sc. Thesis Sharif University of Technology Masihabadi, Sina (Author) ; Eshghi, Kourosh (Supervisor)
    In this research, we try to coordinate a seller-buyer supply chain by using general side-payment contracts in order to gain the maximum possible chain profit. In this model, we take logistics costs into consideration for both buyer and seller and regard the final demand as a decreasing function of retail price which is determined by the buyer. Both parties aim to maximize their individual profits, so we must set contractual parameters in a way that these decisions become aligned with system optimal decisions and the chain surplus profit be assigned to chain members such that they have no intention to leave the coalition. To this aim, we suggest a side- payment contract which consists of...