UIR-PKU: Twitter-OpinMiner System for Sentiment Analysis in Twitter at SemEval 2015 Xu Han author Binyang Li author Jing Ma author Yuxiao Zhang author Gaoyan Ou author Tengjiao Wang author Kam-fai Wong author 2015-06 text Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015) Preslav Nakov editor Torsten Zesch editor Daniel Cer editor David Jurgens editor Association for Computational Linguistics Denver, Colorado conference publication han-etal-2015-uir 10.18653/v1/S15-2111 https://aclanthology.org/S15-2111/ 2015-06 664 668