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ผลงานตีพิมพ์ในวารสารวิชาการOptimal control of feeding in fed-batch production of xylitolผู้แต่ง: Worasit Tochampa,  Dr.Sarote Sirisansaneeyakul, Professor , Dr.Wirat Vanichsriratana, Associate Professor , Dr.Penjit Srinophakun, Professor , Huub H. C. Bakker, Siwaporn Wannawilai, Yusuf Chisti, วารสาร:  
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Optimal Control Problem of Food Intake of Swine During Post Weaning Period) ผู้เขียน:Chanakarn Kiataramkul, Puttida Matkhao สื่อสิ่งพิมพ์:pdf AbstractThe amount of food intake clearly affects swine body weight. The most suitable weight of swine on the day of sale is the weight that fetches the best price. The objective of this research was to minimize the amount of food fed to swine in the post weaning period so that the weight reaches a desirable final value on a fixed day of sale. Optimal control problems were derived by assuming that the weight increase follows either the logistic or the Gompertz equations with parameters estimated from actual growth data. Numerical solutions of the optimal control problem were obtained and discussed. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Optimization of a Primary Metabolite Fermentation Process: Effect of Cost Factor on the Optimal Feed Rate Control) ผู้เขียน:ดร.วิรัตน์ วาณิชย์ศรีรัตนา, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractOptimization of a fed-batch fermentation process is usually done using the calculus of variations to determine an optimal feed rate profile. The obtained optimal feed rate profile consists of sequences of maximum, minimum and singular feed rates. The optimal feed rate control of a primary metabolite process was studied and a biomass production was used as an example. A simple material balance model was used to describe the chosen fermentation process. The problem was then formulated as a free final time problem in the optimal control literature where the control objective was to maximise biomass at the end of the batch. It was shown mathematically that a cost factor per unit of operating time is needed in formulating the objective function. Otherwise the optimal feed rate can not be specified. This is explained by the fact that without cost factor, the optimization algorithm does not take the importance of operating time into account and might result in longer operating time than necessary. This also indicates the essential of using fermentation model on the optimal control problem. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Optimization of a Secondary Metabolite Fermentation Process: Effect of Cost Factor on the Optimal Feed Rate Control) ผู้เขียน:ดร.วิรัตน์ วาณิชย์ศรีรัตนา, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractOptimisation of a fed-batch fermentation process is usually done by using the calculus of variations to determine an optimal feed rate profile. The obtained optimal feed rate profile consists of sequences of maximum, minimum and singular feed rates. In this paper, the optimal feed rate control of a secondary metabolite process was investigated under the different cost factors. A material balance model was used to describe the secondary metabolite production process, where the specific growth rate and the specific product formation rate were assumed to follow the substrate inhibition kinetic. This optimisation problem was formulated as a free final time problem in the optimal control literature where the control objective was to maximise the product at the end of the batch. It was shown mathematically that without a cost factor, the process was operated at the condition where the ratio of the specific product formation rate and the specific growth rate was maximum. With the presence of the cost factor, the operating condition was bounded by two extreme situations. One was at the maximum specific growth rate, where the cost factor is high and the operating time is at utmost important. The other was at the maximum ratio of the specific product formation rate and the specific growth rate, where the operating time was less important and the maximum product was required at the end of the batch. With the moderate cost factor, the process started with growth and gradually changed to product formation. |
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