Srivabut, C.; chantaramanee, suchart; Mahno, A.; Tamjai, J. Optimization of Artesian Water Pump Systems by DMAIC Method Case Study: Porthanklaivajasit Hospital, Chawang District, Nakhon Si Thammarat Province. Eng. & Technol. Horiz. 2023, 40, 39-52.