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	Qihua Wang Computer Science Division IBM Almaden Research Center 650 Harry Road, San Jose, CA
Hi, there!  I am a computer science researcher at IBM Almaden Research Center in San Jose, California.
Brief Biography
I was born and grew up in Guangzhou, which is one of the biggest cities in southern China.  From 1994 to 2000, I attended Guangya Middle School, which was founded in 1888 and is one of the oldest middle schools in the country.  After that, I attended University of Science and Technology of China (USTC) and received a Bachelor's degree in computer science in July 2004.  I did my graduate study in computer science at Purdue University, where I was also affiliated with the Center for Education and Research in Information Assurance and Security (CERIAS).  My advisor was Prof. Ninghui Li. I was a recipient of the Bilsland Dissertation Fellowship for academic year 2008-2009, and I also received the 2009 CERIAS Diamond Award for Academic Excellence. I got my Ph.D. degree in May 2009 and joined IBM in September 2009.
Research Interests
I am interested in analytics and information security in general, and the following topics in particular: 1. Data mining, machine learning, and information retrieval 2. Social computing and collaborative applications 3. Access control modeling and policy management 4. User privacy preservation, especially in enterprise and healthcare
Selected Publications
Journal Articles 1. Satisfiability and Resiliency in Workflow Authorization Systems Qihua Wang and Ninghui Li ACM Transactions on Information and System Security (TISSEC), 2010 2. On the Complexity of Authorization under Qualification and Security Constraints in RBAC Yuqing Sun, Qihua Wang, Ninghui Li, Elisa Bertino, and Mike Atallah To appear in IEEE Transactions on Dependable and Secure Computing (TDSC), 2010 3. Mining Roles with Multiple Objectives Ian Molloy, Hong Chen, Tiancheng Li, Qihua Wang, Ninghui Li, Elisa Bertino, Seraphin Calo, and Jorge Lobo To appear in ACM Transactions on Information and System Security (TISSEC), 2010 4. Resiliency Policies in Access Control Ninghui Li, Qihua Wang and Mahesh Tripunitara ACM Transactions on Information and System Security (TISSEC), 2009 5. Beyond Separation of Duty: An Algebra for Specifying High-level Security Policies Ninghui Li and Qihua Wang Journal of the ACM (JACM), 2008 6. Towards Formal Verification of Role-Based Access Control Policies Somesh Jha, Ninghui Li, Mahesh Tripunitara, Qihua Wang and William Winsborough IEEE Transactions on Dependable and Secure Computing (TDSC), 2008 Refereed Conferences 1. Exploring Online Social Activities for Adaptive Search Personalization Qihua Wang and Hongxia Jin In Proceedings of 19th ACM Conference on Information and Knowledge Management (CIKM), 2010 2. Collaboration Analytics: Mining Work Patterns from Collaboration Activities Qihua Wang, Hongxia Jin, and Yan Liu In 19th ACM Conference on Information and Knowledge Management (CIKM), 2010 3. Usable Access Control in Collaborative Environments: Authorization based on People-Tagging Qihua Wang, Hongxia Jin, and Ninghui Li In Proceedings of 14th European Symposium on Research in Computer Security (ESORICS), 2009 4. On the Security of Delegation in Access Control Systems Qihua Wang, Ninghui Li and Hong Chen In Proceedings of 13th European Symposium on Research in Computer Security (ESORICS), 2008 5. On the Correctness Criteria of Fine-Grained Access Control in Relational Databases Qihua Wang, Ting Yu, Ninghui Li, Jorge Lobo, Elisa Bertino, Keith Irwin and Ji-Won Byun In Proceedings of 33rd International Conference on Very Large Data Bases (VLDB), 2007 6. Satisfiability and Resiliency in Workflow Systems Qihua Wang and Ninghui Li In Proceedings of 12th European Symposium on Research in Computer Security (ESORICS), 2007 7. Beyond Separation of Duty: An Algebra for Specifying High-level Security Policies Ninghui Li and Qihua Wang In Proceedings of 13th ACM Conference on Computer and Communication Security (CCS), 2006 8. Resiliency Policies in Access Control Ninghui Li, Mahesh Tripunitara and Qihua Wang In Proceedings of 13th ACM Conference on Computer and Communication Security (CCS), 2006      The complete list of my publications can be found here.
Professional Activities
1. Panelist, National Science Foundation (NSF), 2010 2. TPC Member, International World Wide Web Conference (WWW), 2011 3. TPC Member, ACM Symposium on Access Control Models and Technologies (SACMAT), 2010, 11 4. TPC Member, International Conference on Collaborative Computing (CollaborateCom), 2008, 09, 10
Awards and Honors
1. Invention Achievement Award (First Plateau), IBM, 2010 2. Diamond Award for Academic Excellence, CERIAS, Purdue University, 2009 3. Bilsland Dissertation Fellowship, Purdue University, 2009
Personal Interests
I love traveling and watching movies.  When I have extra time to kill, I play PC games.  I am a big fan of Diablo 2 and have a huge collection of exceptional items.  Heroes of Might & Magic and Civilization are also my favorites.  I occasionally play real-time strategy games like Warcraft and Age of Empire series.  My favorite sports are tennis, basketball and swimming.
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