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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) ; Akbari, M. R ; Ssheikh Sajadieh, M ; Sharif University of Technology
Abstract
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...
Parallel importation and price competition in a duopoly supply chain
, Article International Journal of Production Research ; Volume 53, Issue 10 , 2015 , Pages 3104-3119 ; 00207543 (ISSN) ; Valizadeh Khaki, S ; Khedmati, M ; Sharif University of Technology
Taylor and Francis Ltd
2015
Abstract
Nowadays, diversion of products distribution from authorised channels to the gray markets is one of the main challenges of manufacturers. Suppose an international supplier distributes the products in several countries with different prices. In parallel importation, there are unauthorised distributers who supply products with a lower price and import them to a higher price market. The problem of parallel importation considering a manufacturer and a competitor is analysed using the game theory approach in this article. We investigate the pricing strategy for manufacturers and the effect of unauthorised distributer on price, market share and profit. We also investigate the performance of...
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) ; Hendi, A. M ; Haji, R ; Sharif University of Technology
2008
Abstract
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
Viable supply chain network design by considering blockchain technology and cryptocurrency
, Article Mathematical Problems in Engineering ; Volume 2021 , 2021 ; 1024123X (ISSN) ; Safavi, S ; Gharehbaghi, A ; Ghaboulian Zare, S ; Hazrati, R ; Weber, G. W ; Sharif University of Technology
Hindawi Limited
2021
Abstract
Nowadays, using Blockchain Technology (BCT) is growing faster in each country. It is essential to apply BCT in Supply Chain Network Design (SCND) and is considered by the designer and manager of SC. This research indicates Viable Supply Chain Network Design (VSCND) by applying BCT. A new form of two-stage robust optimization is suggested. Facility locations and activation BCT for VSCND is the first stage of decisions; finally, we determine flow transshipment between components in the next stage. The GAMS-CPLEX is used for solving the model. The results show that running BCT will decrease 0.99% in costs. There is an economic justification for using BCT when demand is high. A fix-and-optimize...
An optimisation model for cloud-based supply chain network design: Case study in the banking industry
, Article International Journal of Communication Networks and Distributed Systems ; Volume 27, Issue 2 , 2021 , Pages 119-146 ; 17543916 (ISSN) ; Akhavan Niaki, S. T ; Rahbarjou, M ; Sharif University of Technology
Inderscience Publishers
2021
Abstract
New technologies provide tremendous integration opportunities not only for the flow of goods and services but also for managing information and financial data. Flexibility and agility are important metrics in organisations. Cloud technology can have a significant impact on improving flexibility and agility in organisations through faster data transfer between supply chain components. In this study, we present an optimisation model for cloud-based supply chain network design (SCND) problem by optimising the costs and quality of service (QoS). We present a case study in the banking industry to show the applicability and exhibit the efficacy of the proposed optimisation model. Copyright © 2021...
Studying and Comparing Agile and Lean Supply Chain Models and Determining the Optimum Model Using Genetic Algorithm
, M.Sc. Thesis Sharif University of Technology ; Ghasemi, Farhad (Supervisor)
Abstract
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,...
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,...
Graph homomorphisms through random walks [electronic resource]
, Article Journal of Graph Theory ; 2003, Volume 44, Issue 1, pages 15–38 ; Hajiabolhassan, Hossein ; Sharif University of Technology
Abstract
In this paper we introduce some general necessary conditions for the existence of graph homomorphisms, which hold in both directed and undirected cases. Our method is a combination of Diaconis and Saloff–Coste comparison technique for Markov chains and a generalization of Haemers interlacing theorem. As some applications, we obtain a necessary condition for the spanning subgraph problem, which also provides a generalization of a theorem of Mohar (1992) as a necessary condition for Hamiltonicity. In particular, in the case that the range is a Cayley graph or an edge-transitive graph, we obtain theorems with a corollary about the existence of homomorphisms to cycles. This, specially, provides...
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 ; Eshghi, Kourosh ; Sharif University of Technology
Abstract
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 ; Eshghi, Kourosh ; Torabi, S. Ali ; Sharif University of Technology
Abstract
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...
Pricing and lead-time decisions in a decentralized supply chain under competition
, Article CIE 2014 - 44th International Conference on Computers and Industrial Engineering and IMSS 2014 - 9th International Symposium on Intelligent Manufacturing and Service Systems, Joint International Symposium on "The Social Impacts of Developments in Information, Manufacturing and Service Systems" - Proceedings ; 2014 , p. 250-259 ; Shavandi, H ; Sharif University of Technology
Abstract
In this paper we study a two-echelon decentralized supply chain consists of one retailer and several manufacturers in competitive environment. The manufacturers compete on their price and lead time. To model the interactions between the retailer and manufacturers, we use Stackelberg game in which the manufacturers decide on their wholesale price and lead time as leader and the retailer decides on retail price and its order quantity to each manufacturer as follower. Besides, we use the Nash Equilibrium analysis to investigate the horizontal competition between manufacturers to model their simultaneous decision making on their price and lead time. In this problem, the customers' demand is a...
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) ; Saharidis, G. K. D ; Davoudpour, H ; Malekly, H ; Yektamaram, S. A ; Sharif University of Technology
2013
Abstract
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) ; Behravesh, M ; Karegar, N ; Sharif University of Technology
Kauno Technologijos Universitetas
2013
Abstract
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...
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) ; Sharif University of Technology
Abstract
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 ; 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
Abstract
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...
Stationary entanglement achievable by environment-induced chain links
, Article Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 83, Issue 4 , 2011 ; 10502947 (ISSN) ; Mancini, S ; Sharif University of Technology
Abstract
We investigate the possibility of chaining qubits by letting pairs of nearest-neighbor qubits dissipate into common environments. We then study entanglement dynamics within the chain and show that steady-state entanglement can be achieved
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) ; Naeij, J ; Shavandi, H ; Makui, A ; Sharif University of Technology
Abstract
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...
A stochastic approach for valuing customers in banking industry: A case study
, Article Industrial Engineering and Management Systems ; Volume 19, Issue 4 , 2021 , Pages 744-757 ; 15987248 (ISSN) ; Mehraeen, M ; Pooya, A ; Sharif, H ; Sharif University of Technology
Korean Institute of Industrial Engineers
2021
Abstract
This study provides a stochastic dynamic programming model with a Markov chain that explicitly focuses on the customer as well as a new model for valuing the customers in the banking industry. The proposed framework calculates individual customer’s lifetime value dynamically. The study follows a stochastic dynamic programming model that is based on the Markov chain. The deduced findings are illustrated with supplementary context from an outstanding case study. The findings underline the importance of the stochastic model for calculating customer lifetime value based on customer behavior. The presented framework provides a beneficial way for future research and valuable insight for allocating...
Lower extremity kinematic coupling during single and double leg landing and gait in female junior athletes with dynamic knee valgus
, Article BMC Sports Science, Medicine and Rehabilitation ; Volume 13, Issue 1 , 2021 ; 20521847 (ISSN) ; Sheikhhoseini, R ; Jafarian, M ; Esmaeili, A ; Sharif University of Technology
BioMed Central Ltd
2021
Abstract
Background: Dynamic knee valgus (DKV) is a common lower extremity movement disorder among females. This study aimed to investigate kinematic couplings between lower extremity joints in female junior athletes with DKV during single and double-leg landing and gait. Methods: Twenty-six physically active female junior athletes (10–14 years old) with DKV were recruited. Kinematic couplings between rearfoot, tibia, knee, and hip were extracted using eight Vicon motion capture cameras and two force plates. Zero-lag cross-correlation coefficient and vector coding were used to calculate kinematic couplings between joints during physical tasks. Paired t-test and Wilcoxon tests were run to find...
Viable medical waste chain network design by considering risk and robustness
, Article Environmental Science and Pollution Research ; 2021 ; 09441344 (ISSN) ; Kargar, B ; Gharehbaghi, A ; Weber, G. W ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2021
Abstract
Medical waste management (MWM) is an important and necessary problem in the COVID-19 situation for treatment staff. When the number of infectious patients grows up, the amount of MWMs increases day by day. We present medical waste chain network design (MWCND) that contains health center (HC), waste segregation (WS), waste purchase contractor (WPC), and landfill. We propose to locate WS to decrease waste and recover them and send them to the WPC. Recovering medical waste like metal and plastic can help the environment and return to the production cycle. Therefore, we proposed a novel viable MWCND by a novel two-stage robust stochastic programming that considers resiliency (flexibility and...
Analytical methods in fatty acid analysis for microbial applications: the recent trends
, Article Preparative Biochemistry and Biotechnology ; Volume 51, Issue 10 , 2021 , Pages 937-952 ; 10826068 (ISSN) ; Roosta Azad, R ; Sardari, S ; Sharif University of Technology
Taylor and Francis Ltd
2021
Abstract
Fatty acids are among the most important components of many biological systems and have been highlighted in many research fields in recent decades. In the food industry, it is important to check the amount and types of fatty acids in edible oils, beverages and other foods products, and checking the fatty acids parameters are among the quality control parameters for those products. In medical applications, investigation of fatty acids in biological samples and comparing imbalances in them can help to diagnose some diseases. On the other hand, the development of cell factories for the production of biofuels and other valuable chemicals requires the accurate analysis of fatty acids, which serve...