1. Yihong, L.: Intelligent teaching system based on big data analysis technology. Mod. Electron. Techn. 44(07), 178–182 (2021)
2. Zhang Tingting, H., Linmin, W.G.: Reliability analysis of a discrete time random uncertain multi-state system. J. Syst. Sci. Math. Sci. 41(07), 2006–2017 (2021)
3. Haiyan, S., Chun, W., Yanqing, W., et al.: Reliability analysis for systems subject to competing failure processes based on uncertainty theory. J. Beijing Univ. Aeron. Astronaut. 47(01), 84–89 (2021)
4. Niu, L., Han, F.: Analysis of the 3D application evaluation system of landscape based on hybrid cooperation of VR and AI. Sci. Program. 2021, 1–11 (2021)
5. Gao, G., Li, W.: Architecture of visual design creation system based on 5G virtual reality. Int. J. Commun. Syst. 35(5), 1–20 (2021)