International Journal of Supply Chain and Inventory Management
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International Journal of Supply Chain and Inventory Management (3 papers in press)
Optimal ordering policies for non- instantaneous Weibull deteriorating items with price linked demand under trade credits by R.P. Tripathi, Hari Shyam Pandey Abstract: The occurrence of numerous markets creates gainful opportunities to vendors and buyers. In this regard, this paper consists of the joint relationship between price sensitive demands with Weibull allocation decline. This study is annoyed by Soni (International Journal of Production Economics, 146, 259 268) considering Weibull distribution deterioration with two parameter under trade credits. Mathematical model is established for finding optimal cycle time and total turnover considering three cases for each situation depending on the position of time after which item starts to deteriorate and credit period. The objective of this investigation is to find the optimal total profit over cycle time. Further, we use numerical examples and sensitive analysis to illustrate the results and conclude the paper with suggestion for possible future research. Mathematica 7.1 software is used for numerical results. Keywords: Inventory; Weibull deterioration; price linked demand; trade credits; credit period.
Energy Efficiency Optimization in Supply Chain Networks: Impact of Inventory Management by Charlène Niesseron, Rémy Glardon, Nicolas Zufferey, Mohsen Jafari Abstract: This work describes the development of a model to address sustainability in supply chain networks in comparing environmental impact to cost optimization. It takes into account the effect of inventory management policies on energy consumption in transportation and storage. Using a detailed energy consumption infrastructure, a model was developed with the Arena software. The considered inventory management policy is the replenishment method. This work first focusses on a Base Case with one product type, involving one transportation link and one storage node. The transportation link allows the transfer of products from the supplier to the distributor where the material is stocked in order to fulfill the demand of the next member in the chain. This system is studied in the most general fashion so that the analysis could be applied to any transportation link and storage node of a supply chain. In addition, an Extended Case is considered, including additionally the transportation from the distributor to the customers. Real data is used, obtained from a food company in Indonesia. Our results show that the most energy efficient solution is not necessarily detrimental to the economic profits. Also, a higher performance does not always mean a higher energy use: increasing the service level can indeed decrease the energy use. Finally, our analysis shows that the model can be extended to describe an entire supply chain network. Keywords: Energy; Optimization; Supply chain; Transportation; Inventory Management; Simulation.
Shortage Linked EOQ model for Weibull-time unstable demand in the company of Permitted delay in Payments by R.P. Tripathi, Hari Shyam Pandey, Pravin Srivastav Abstract: In this study, we consider economic order quantity (EOQ) model over a restricted horizon, where demand rate follows a two-parameter Weibul time-linked. Shortages are tolerable and absolutely backlogged. Mathematical formulations are derived under two unlike state of affairs i.e. case 1: The permissible delay is fewer than or identical time to close positive inventory for settling the account and case 2: Allowable delay period is larger than time to finish positive inventory. Based on the most favorable solutions several significant outcomes are derived and arithmetic examples are given to authenticate the projected model. Sensitivity investigation is discussed to investigate effects of dissimilarity with variation in one constraint at a time on best possible clarification. Keywords: Inventory; EOQ; Shortage Weibull time-dependent demand trade; credit period.