Suwan, T., M. Nokkaew, C. Surawanitkun, K. Sorn-In, N. Mueanrit, K. Nongpong, T. Yeophantong, W. Supasai, and A. Siritaratiwat. “Aspect-Level Sentiment Analysis Using WangchanBERTa for Fine-Grained Service Insight Extraction in Hotel Reviews”. ECTI Transactions on Electrical Engineering, Electronics, and Communications, vol. 24, no. 2, June 2026, doi:10.37936/ecti-eec.2026242.262946.