Khamwandee , C., & Saengprajak, A. (2026). Roles of Activation Functions on the Polarization Modeling for the 1.2 kWp Proton Exchange Membrane Fuel Cells: A Focus on ReLU, Sigmoid, and Tanh. Journal of Renewable Energy and Smart Grid Technology, 21(1), 107–118. https://doi.org/10.69650/rast.2026.263264