Software System Evolution Analysis Method Based on Algebraic Topology IoT-Based Cost Saving Offloading System for Cellular Networks EVchain: An Anonymous Blockchain-Based System for Charging–Connected Electric Vehicles Regulation and decision system of water, fertilizer and salt in salinized farmland based on WebGIS ReseaRch on GRadient Valuation techniques Based on the system of intellectual PRoPeRty RiGhts finance MIX-RS:A Multi-Indexing System Based on HDFS for Remote Sensing Data Storage Restrictions on incremental financial investment in the construction of modern public cultural service system: Based on investigations of county public libraries An Axiom System of Probabilistic Mu-Calculus Research on index system of sustainable development of telecom operator Construction of ecological curriculum system in universities and colleges