Topics started by kmohamad095
Dear All,I’m writing to inquire about the application of uncertainty on a supply chain model. My Supply chain model has three echelons that target the production, warehousing, and distribution of medication products. The deterministic version of my model works perfectly, but is far from reality as production equals demand, which is why uncertainty of the demand parameter has to be considered.I was given a model (https://how-to.aimms.com/Articles/484/484-Uncertainty-productionplanningro.html) that briefly describes how to apply uncertainty to parameters, however, the given model was very small and didn’t help me in applying uncertainty to my desired project. As stated earlier, I have several medications to be sold in several pharmacies, therefore, the medication demand is not a single number but a matrix. I used the BOX function to define the demand matrix to be between a lower and upper pre-defined parameter matrices.The first problem occurred when I didn’t assign values to the uncerta
Dear All, My name is Mohamad Khaled and for my university research project I am using AIMMS to model a 3-echelon Pharmaceutical Supply Chain model. The current model I’m trying to define and solve is a simple one compared to some of the models I have seen here. I have two issues with my current model: The first issue is that the pharmaceutical products (AKA medication) has an uncertain demand which I am not able to properly define in the project despite indicating the index domain, using the uncertain option in the property setting and defining the box function with an upper and a lower value in the region area. (I attached a screenshot of the demand parameter with the descriptions and region and another screenshot of the current “nominal” data of the demand) The second issue is the wastage/expiration of the medication. I have defined a shelf-life variable and respective constraint, however, I couldn’t get the shelf-life variable to be used in the wastage constraint as the following w
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