• ATA ALLAH TALEIZADEH

      Articles written in Sadhana

    • Optimization of imperfect economic manufacturing models with a power demand rate dependent production rate

      RAZIEH KESHAVARZFARD AHMAD MAKUI REZA TAVAKKOLI-MOGHADDAM ATA ALLAH TALEIZADEH

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      The constant demand rate is the most common assumption of the basic economic production quantity model, which is not very frequent in practice. In real world situations, demand usually varies with time. With regard to the widespread necessity of power demand pattern, demand is supposed to follow a power law.Another unrealistic assumption is perfect quality of all items. This paper presents a production system with defective items to determine the optimal replenishment quantity, cycle length and backordered size with a power demand rate dependent production rate. We assume that a manufacturer may be faced with three different cases regarding to the date that defective items are drawn from inventory. The set-up, backordering, inspection, and production costs, as well as holding cost of both perfect and imperfect items are accounted in the inventory system. An algorithm is offered to optimize total inventory cost and then numerical analyses are presented to demonstrate the applicability of the proposed models. Finally, some sensitivity analyses and managerial insights are provided.

    • Pricing and market segmentation in an uncertain supply chain

      HOSSEIN SALEHI ATA ALLAH TALEIZADEH REZA TAVAKKOLI-MOGHADDAM ASHKAN HAFEZALKOTOB

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      This paper addresses a new location-allocation-pricing problem in designing a three-level uncertain supply chain network with stochastic price-sensitive demands. Using the market segmentation problems, a supply-chain network is developed with two distribution channels that consist of Brick & Mortar and onlinemarkets, when some demand leakages occur from the market with a higher price. Due to the lack of physical observation of products in online markets, a return policy is used. So, demand behavior is analyzed in terms of the pricing and return policy. The problem established location, allocation, order quantities, pricing and refundprice decisions to optimize the total profit of the chain. Furthermore, it is formulated as a mixed-integer nonlinearprogramming (MINLP) model and solved by a Lagrangian relaxation algorithm. The numerical study andcomputational results indicate the efficiency and effectiveness of the proposed algorithm

    • Ordering and pricing decisions of regular products in a supply chain with the effects of product-specific gift cards

      MOHSEN LASHGARI SEYED JAFAR SADJADI ATA ALLAH TALEIZADEH MAHDI HEYDARI

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      Fast development and increasing popularity of gift cards motivates many retailers to offer such cards to their customers. This paper aims to examine the effects of gift cards and inflation on optimal ordering policy for regular products and to analyze the advantages of providing product-specific gift cards. Two models are proposed. In the first model, benefit function of retailer and supplier are considered separately and in the second model both of them are considered as a chain, and benefit function is optimized for a limited planning horizon. In this inventory system, the current value of the whole profit for the limited planning horizon is first modeled. Next, an algorithm is proposed for each model to obtain the optimal order for retailer and supplier, the value of discount for gift cards and the number of replacement retailer and supplier during the planning horizon.Eventually, we show our model through numerical examples and also report the sensitivity analysis to find some managerial insights.

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