Site selection strategy for restaurant chain expansion in urban districts based on maximization of customer attraction and profitability: ACKNOWLEDGEMENTS: This work was Supported by National Key Laboratory of Science and Technology on Helicopter Transmission(Nanjing University of Aeronautics and Astronautics)(Grant No. HTL-O-20K01) and Changzhou Science and Technology Planning Project(CE20225067). ISTAER. Published online January 16, 2025:57-70. Accessed April 20, 2025. https://istaer.online/index.php/Home/article/view/No.2320