Deep neural network-based hybrid modeling and experimental validation for an industry-scale fermentation process: Identification of time-varying dependencies …

P Shah, MZ Sheriff, MSF Bangi, C Kravaris… - Chemical Engineering …, 2022 - Elsevier
Kinetic modeling of fermentation processes is difficult due to the use of micro-organisms that
follow complex reaction mechanisms. Kinetic models are usually not perfect owing to …

Physics-informed neural networks for hybrid modeling of lab-scale batch fermentation for β-carotene production using Saccharomyces cerevisiae

MSF Bangi, K Kao, JSI Kwon - Chemical Engineering Research and Design, 2022 - Elsevier
Abstract β-Carotene has a positive impact on human health as a precursor of vitamin A.
Building a kinetic model for its production using Saccharomyces cerevisiae in a batch …

Deep hybrid modeling of chemical process: Application to hydraulic fracturing

MSF Bangi, JSI Kwon - Computers & Chemical Engineering, 2020 - Elsevier
Process modeling began with the use of first principles resulting in 'white-box'models which
are complex but accurately explain the dynamics of the process. Recently, there has been …

Hybrid Koopman model predictive control of nonlinear systems using multiple EDMD models: An application to a batch pulp digester with feed fluctuation

SH Son, HK Choi, J Moon, JSI Kwon - Control Engineering Practice, 2022 - Elsevier
In the pulping process, feed fluctuations often occur due to the supply of raw materials from
various and unconventional sources, such as recycle to meet the increasing market demand …

Deep hybrid model‐based predictive control with guarantees on domain of applicability

MSF Bangi, JSI Kwon - AIChE Journal, 2023 - Wiley Online Library
A hybrid model integrates a first‐principles model with a data‐driven model which predicts
certain unknown dynamics of the process, resulting in higher accuracy than first‐principles …

Koopman Lyapunov‐based model predictive control of nonlinear chemical process systems

A Narasingam, JSI Kwon - AIChE Journal, 2019 - Wiley Online Library
In this work, we propose the integration of Koopman operator methodology with Lyapunov‐
based model predictive control (LMPC) for stabilization of nonlinear systems. The Koopman …

[HTML][HTML] Data-driven modeling of multimode chemical process: Validation with a real-world distillation column

Y Choi, B Bhadriaju, H Cho, J Lim, IS Han… - Chemical Engineering …, 2023 - Elsevier
Real-world industrial processes frequently operate in different modes such as start-up,
transient, and steady-state operation. Since different operating modes are governed by …

Development of offset-free Koopman Lyapunov-based model predictive control and mathematical analysis for zero steady-state offset condition considering influence …

SH Son, A Narasingam, JSI Kwon - Journal of Process Control, 2022 - Elsevier
Koopman operator theory enables a global linear representation of a given nonlinear
dynamical system. However, since an approximation to the Koopman operator cannot fully …

Deep reinforcement learning control of hydraulic fracturing

MSF Bangi, JSI Kwon - Computers & Chemical Engineering, 2021 - Elsevier
Hydraulic fracturing is a technique to extract oil and gas from shale formations, and
obtaining a uniform proppant concentration along the fracture is key to its productivity …

Application of offset‐free Koopman‐based model predictive control to a batch pulp digester

SH Son, HK Choi, JSI Kwon - AIChE Journal, 2021 - Wiley Online Library
This work presents the application of a Koopman operator approach to a batch pulp
digester. To manufacture paper products with desired properties, it is essential to consider …