Hanhoon Kang Seong Joon Yoo Dongil Han Accessing Positive and Negative Online Opinions. 359-368 2009 HCI (7) http://dx.doi.org/10.1007/978-3-642-02713-0_38 conf/hci/2009-7 db/conf/hci/hci2009-7.html#KangYH09