1Design and development of digital factory management system based on 3D GISXIAO Chang-wei, NIAN Li-hui, QU Guo-peng, YAN Gao-yuan4-62Research on the current situation of smart old-age care in Dalian cityWANG Xiao-shu7-93Substation relay protection physical ID combination technology based on blockchain technologyYE Hai, HU Peng19-214Research on vehicle depot design scheme of qixing mountain rack railway in zhangjiajieSONG Chen28-305Design and application of key parameters of harbor-type rescue point of Shanghai—Nanjing ExpresswayYU Man, FAN Zhao31-346Application of electromechanical installation optimization of metro project based on BIMFU Peng35-377Analysis on planning and design ideas of smart parks under construction of smart citiesYUE Zong-tian, LIU Xiang-chao, JIANG Zi-quan, ZHANG Gui-hua45-478Application analysis of green concept in modern architectural designZHAO Jian-yun48-509Research on complementary development of traditional energy and new energy in Hainan ProvinceHOU Wen-li, DONG Yu-heng51-5310Intelligent heating control system based on HLinkLU Liu-ting54-5611Research on distribution characteristics and driving mechanism of star-rated hotels in TaiyuanLIN Jia-mei, ZUO Kai-jie60-6212Research on optimization of expressway operation management based on 5G technologyWANG Qiu63-6513Application of cloud computing in the intelligentization of rooftop air conditionersYANG Qing69-71