Tran PNM, Nguyen CQN, Nguyen LBP, Tran TD. Hybrid GRU-VAE and Spectral Residual Anomaly Detection for OWC Predictive Maintenance: A Technical and Economic Assessment at Chu Lai Port. EAI Endorsed Trans on Trans and OE. 2026;2(2). doi:10.4108/tsoe.14956