Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/294923 
Year of Publication: 
2020
Citation: 
[Journal:] Junior Management Science (JUMS) [ISSN:] 2942-1861 [Volume:] 5 [Issue:] 1 [Year:] 2020 [Pages:] 50-80
Publisher: 
Junior Management Science e. V., Planegg
Abstract: 
Biopharmaceuticals are the fastest-growing segment of the pharmaceutical industry. Their manufacture is complicated by the uncertainty exhibited therein. Scholars have studied the planning and operation of such production systems under some uncertainties, but the simultaneous consideration of fermentation and resin yield uncertainty is lacking so-far. To study the optimal operation of biopharmaceutical production and purification systems under these uncertainties, a stochastic, dynamic approach is necessary. This thesis provides such a model by extending an existing discrete state-space, infinite horizon Markov decision process model of upstream fermentation. Tissue Plasminogen Activator fermentation and chromatography was implemented. This example was used to discuss the optimal policy for operating different fermentation setups. The average per-cycle operating profit of a serial setup was 1,272 $; the parallel setup produced negative average rewards. Managerial insights were derived from a comparison to a basic, titer maximizing policy and process sensitivities. In conclusion, the integrated stochastic optimization of biopharma production and purification control aids decision making. However, the model assumptions pose room for further studies.
Subjects: 
Markov decision process
biopharmaceuticals production
fermentation uncertainty
chromatography resin
stochastic performance decay
Persistent Identifier of the first edition: 
Creative Commons License: 
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Document Type: 
Article
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