Suwan, T., Nokkaew, M., Surawanitkun, C., Sorn-In, K., Mueanrit, N., Nongpong, K., Yeophantong, T., Supasai, W. and Siritaratiwat, A. 2026. Aspect-Level Sentiment Analysis Using WangchanBERTa for Fine-Grained Service Insight Extraction in Hotel Reviews. ECTI Transactions on Electrical Engineering, Electronics, and Communications. 24, 2 (Jun. 2026). DOI:https://doi.org/10.37936/ecti-eec.2026242.262946.