Khamwandee , C., and A. Saengprajak. “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, vol. 21, no. 1, Apr. 2026, pp. 107-18, doi:10.69650/rast.2026.263264.