Questions tagged [inventory]
For questions about mathematical models and algorithms for optimizing inventories.
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Optimal Inventory with Fixed Order Sizes (e.g. multiples of 10)
I'm interested in dynamic optimal inventory models where orders must come in multiples of some fixed amount, such as 10 units. In such a case, one might ideally order, say, 18 units at some point but ...
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How is this function piece-wise linear?
I encountered this lemma in a research paper related to End-to-End inventory management model.
Please note that $d_{[t_1,t_2]} = \sum_{t=t_1}^{t_2} d_i$, where $d_t$ denotes demand at time instance t. ...
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Determine (in 2 iterations)
A company following the reorder level policy has the following costs associated with a given product: ordering cost of 100 monetary units (u.m.) per order; stock holding cost of 12 u.m. per unit per ...
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Order Quantity Formula with multiple pipeline shipments allowed
I'm working an inventory problem for a client where we're trying to identify optimal order size and safety stock value when we can have multiple shipments in the pipeline (long lead time). All the ...
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Forecasting based inventory management
In most text books on inventory management and inventory optimisation I have come across, it is assumed that demand follows some known distribution (often a normal distribution). However, when talking ...
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Deploying optimization model to production environment
I have developed an inventory optimization model for my warehouse and I want to know, how to validate this model, perform User acceptance testing and deploy it to production environment?
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Periodic Review System of Inventory to setup Target Days of Supply
Background: I am working on defining Target Days of Supply for a periodic review system with a review period of 1 week. I have weekly demand data for the complete year. I can calculate Mean weekly ...
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Optimizing Safety Stock in a Multi Echelon Optimization
In general the relationship between safety stock and service level is non-convex. As it contains often a Normal distribution or simulation.
If one considers now optimization the supply chain by ...
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Seeking Help: Algorithm Recommendations for Inventory Data Adjustment
I am currently working with inventory fluctuation data for a company and facing some issues. The raw data is stored in an xls file, recorded on a monthly basis. According to the logic, the sum of the ...
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Multi-period Inventory Balance in Gurobipy
I would like to get the inventory balance in the oponed facility $\text{C}$ such that, the Inventory at time $t$ is equal to the previous one, plus the inflow minus the outflow. I have tried to create ...
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use Forecast distribution width in inventory optimization
I have a demand forecast that gives me a distribution for future demand, for each time period in percentiles (e.g. demand for period 1 will be between 6 and 25 (zero and 100th percentiles, and i know ...
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To maintain safe order level from a customer
A telecommunication company (CALLME TEL Co., Ltd) receives and processes customers’ orders.
Orange Co., Ltd is an important customer, who mostly places orders every 2 months. Medium quantity of ...
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How to model not-met demand to next period?
I am trying to include to my model a demand shift. That is, I am having a fixed demand for each period (t), but because of capacity constraints I am not able to serve the whole demand for each period. ...
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Inventory Continuity Equation
I have to minimize the inventory remaining at end of the period(28 days). Each item would perish after a fixed number of days and we can order items only on certain weekdays(M,T,S,S). Demand is ...
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MILP modeling Code with pyomo or gurobi or cplex or GAMS. Any link?
I am looking for MILP modeling code with stochastic/deterministic demand for Inventory ordering policy (e.g. (q,r) or (s,S) policy) with pyomo or gurobi or cplex or GAMS. Any link?
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