Intelligence and Security Informatics : Pacific Asia Workshop, PAISI 2007, Chengdu, China, April 11-12, 2007, Proceedings - Christopher C. Yang, Daniel Zeng, Michael Chau, Kuiyu Chang, Qing Yang, Xueqi Cheng, Jue Wang, Fei-Yue Wang, . Hsinchun Chen ((Lecture Notes in Computer Science))