pdf dblp NudtMDP at TREC 2015 LiveQA Track Yuanping Nie | Jiuming Huang | Zongsheng Xie | Hai Li | Pengfei Zhang | Yan Jia Proceedings of The Twenty-Fourth Text REtrieval Conference, TREC 2015, Gaithersburg, Maryland, USA, November 17-20, 2015