You may download my publications here.

• A Universal Topic Framework (UniZ) and Its Application in Online Search, Youngchul Cha, Keng-hao Chang, Hari Bommaganti, Ye Chen, Tak Yan, Bin Bi, and Junghoo Cho, SAC 2015 [pdf]
• Exploration of the Effect of Category Match Score in Search Advertising, Youngchul Cha, Junghoo Cho, Jian Yuan, and Tak Yan, ICDE 2014 [pdf]
• Incorporating Popularity in Topic Models for Social Network Analysis, Youngchul Cha, Bin Bi, Chu-Cheng Hsieh, and Junghoo Cho, SIGIR 2013 ( nominated for the best paper award) [pdf]
• Social Network Analysis Using Topic Models, Youngchul Cha and Junghoo Cho, SIGIR 2012 [pdf]