Signal Processing of Ground Penetrating Radar Based on MED Technology -- Application Analysis of Information Security Technology in Credit Card System -- A Job Recommendation System Based on Student and Category Similarity Computation -- Correct Modeling of SH 50ETF Option Implied Volatility Based on Neural Network -- International Trade Strategy of SMEs Based on Blockchain Technology -- Information Collection Analysis and Processing of Digital Substation Based on Artificial Intelligence -- Computer Network Monitoring and Analysis Method Based on Petri Net -- Fuzzy Control Method Based on Dynamic Self-Optimization -- Application of Data Encryption Technology in Computer Software Testing -- New Rural Intelligent Pension Model Based on Big Data Technology -- Application of Dual-Loop Control Algorithm Simulation Technology in Power Regulation of New Energy Grid -- Mine Safety Monitoring and Early Warning System Based on 5G Network Technology -- The Influence of Fintech on the Performance of Commercial Bank Based on Big Data Analysis -- Research and Design of Soft Switch Technology in New Energy Vehicle Wireless Charging System -- High Dimensional Data Visualization Analysis Based on Unsupervised Laplacian Score.