Selected Publications / 2012 / 2011 / 2010 / 2009 / 2008 / 2007 and Earlier /

• H. Hu, J. Xu, Q. Chen, and Z. Yang. "Authenticating Location-based Services without Compromising Location Privacy." Proc. of the 2012 ACM SIGMOD International Conference on Management of Data (SIGMOD '12), Scottsdale, Arizona, USA, May 2012.
• C. Jin, S. S. Bhowmick, B. Choi, and S. Zhou. "PRAGUE: Towards Blending Practical Visual Subgraph Query Formulation and Query Processing." Proc. the 28th IEEE International Conference on Data Engineering (ICDE '12), April 2012.
• X. Lin, J. Xu, and H. Hu. "Range-based Skyline Queries in Mobile Environments." IEEE Transactions on Knowledge and Data Engineering (TKDE), accepted to appear.
• S. T. On, J. Xu, B. Choi, H. Hu, and B. He. "Flag Commit: Supporting Efficient Transaction Recovery in Flash-based DBMSs." IEEE Transactions on Knowledge and Data Engineering (TKDE), accepted to appear.
• X. Pan, J. Xu, and X. Meng. "Protecting Location Privacy against Location-Dependent Attacks in Mobile Services." IEEE Transactions on Knowledge and Data Engineering (TKDE), accepted to appear.
• Dingming Wu, Gao Cong and Christian S. Jensen. "A Framework for Efficient Spatial Web Object Retrieval." The VLDB Journal (VLDBJ), accepted to appear.
• Y. Li, S. T. On, J. Xu, H. Hu, and B. Choi. "Optimizing Non-Indexed Join Processing for Flash Storage based Systems." IEEE Transactions on Computers (TC), accepted to appear.
• Z. Huo, X. Meng, H. Hu, and Y. Huang. "You Can Walk Alone: Trajectory Privacy-preserving through Significant Stays Protection." Proc. of the 17th International Conference on Database Systems for Advanced Applications (DASFAA '12), April 2012.

• Y. Tang, J. Xu, S. Zhou, W.-C. Lee, D. Deng, and Y. Wang. "A Lightweight Multi-dimensional Index for Complex Queries over DHTs." IEEE Transactions on Parallel and Distributed Systems (TPDS), 22(12): 2046-2054, Dec. 2011.
• X. Lin, J. Xu, H. Hu. "Authentication of Location-based Skyline Queries." Proc. the 20th ACM Conference on Information and Knowledge Management (ACM CIKM '11), Glasgow, Scotland, UK, October 2011. (Short Paper)
• S. Gao, J. Xu, B. He, B. Choi, and H. Hu. "PCMLogging: Reducing Transaction Logging Overhead with PCM." Proc. the 20th ACM Conference on Information and Knowledge Management (ACM CIKM '11), Glasgow, Scotland, UK, October 2011. (Poster Paper)
• J. Deng, F. Liu, Y. Peng, B. Choi, and J. Xu. "Predicting the Optimal Ad-hoc Index for Reachability Queries on Graph Databases." Proc. the 20th ACM Conference on Information and Knowledge Management (ACM CIKM '11), Glasgow, Scotland, UK, October 2011. (Poster Paper)
• Z. Yang, S. Gao, J. Xu, and B. Choi. "Authentication of Range Query Results in MapReduce Environments." Proc. the 3rd ACM Workshop on Cloud Data Management (CloudDB '11), October 2011.
• H. Hu, J. Xu, C. Ren and B. Choi. "Processing Private Queries over Untrusted Data Cloud through Privacy Homomorphism." Proc. the 27th IEEE International Conference on Data Engineering (ICDE '11), Hannover, Germany, April 2011.
• Y. Peng, B. Choi and J. Xu. "Selectivity Estimation of Twig Queries on Cyclic Graphs." Proc. the 27th IEEE International Conference on Data Engineering (ICDE '11), Hannover, Germany, April 2011.
• J. Deng, B. Choi, J. Xu and S. Bhowmick. "Optimizing Incremental Maintenance of Minimal Bisimulation of Cyclic Graphs." Proc. the 16th International Conference on Database Systems for Advanced Applications (DASFAA '11), Hong Kong, China, April 2011.

• H. Hu, J. Xu, S. T. On, J. Du, and J. K. Ng. "Privacy-Aware Location Data Publishing." ACM Transactions on Database Systems (TODS), 35(3), July 2010. [pdf]
• H. Hu and J. Xu. "2PASS: Bandwidth-Optimized Location Cloaking for Anonymous Location-Based Services." IEEE Transactions on Parallel and Distributed Systems (TPDS), 21(10): 1458-1472, October 2010. [pdf]
• R. Bramandia, B. Choi, and W-K. Ng. "Incremental Maintenance of 2-hop Labeling of Large Graphs." IEEE Transactions on Knowledge and Data Engineering (TKDE) 22(5): 682-698, May 2010.
• H. Hu, J. Xu, and D. L. Lee. "PAM: An Efficient and Privacy-Aware Monitoring Framework for Continuously Moving Objects." IEEE Transactions on Knowledge and Data Engineering (TKDE), 22(3): 404-419, March 2010. [pdf]
• J. Xu, X. Tang, H. Hu, and J. Du. "Privacy-Conscious Location-Based Queries in Mobile Environments." IEEE Transactions on Parallel and Distributed Systems (TPDS), 21(3): 313-326, March 2010. [pdf]
• Y. Tang, S. Zhou, and J. Xu. "LIGHT: A Query-Efficient yet Low-Maintenance Indexing Scheme over DHTs." IEEE Transactions on Knowledge and Data Engineering (TKDE), 22(1): 59-75, Jan. 2010. [pdf]
• L. Zhu, A. Sun and B. Choi. "Detecting Spam-blogs from Blog Search Results." Information Processing and Management (IPM), to appear.
• S. T. On, H. Hu, Y. Li, and J. Xu. "Flash-Optimized B+-Tree." Journal of Computer Science and Technology (JCST), 5(3): 507-520, May 2010.
• C. Jin, S. S Bhowmick, X. Xiao, J. Cheng and B. Choi. "GBLENDER: Towards Blending Visual Query Formulation and Query Processing in Graph Databases." Proc. the 29th ACM SIGMOD International Conference on Management of Data (SIGMOD '10), Indianapolis, USA, June 2010.
• Y. Li, J. Xu, B. Choi, and H. Hu. "StableBuffer: Optimizing Write Performance for DBMS Applications on Flash Devices." Proc. the 19th ACM International Conference on Information and Knowledge Management (CIKM '10), Toronto, Canada, October, 2010.
• S. T. On, Y. Li, B. He, M. Wu, Q. Luo, and J. Xu. "FD-Buffer: A Buffer Manager for Databases on Flash Disks." Proc. the 19th ACM International Conference on Information and Knowledge Management (CIKM '10), Toronto, Canada, October, 2010. (Short paper)
• B. Choi, H. Hu, J. Xu, W. Cheung, C. H. Li and J. Liu. "Data Engineering in Graph Databases." Proc. the 25th International Symposium on Computer and Information Sciences (ISCIS '10), Invited Paper, London, UK, September, 2010.
• M. Cheng, B. Choi and W. Cheung. "Hiding Emerging Patterns with Local Recoding Generalization" Proc. the 14th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD '10), Hyderabad, India, June 2010.
• X. Liu, J. Xu, and W.-C. Lee. "A Cross Pruning Framework for Top-k Data Collection in Wireless Sensor Networks." Proc. the 11th International Conference on Mobile Data Management (MDM '10), Kanas City, Missouri, USA, May 2010.
• X. Liu, M. Ye, J. Xu, Y. Tian, and W.-C. Lee. "k-Selection Query over Uncertain Data." Proc. the 15th International Conference on Database Systems for Advanced Applications (DASFAA '10), Tsukuba, Japan, April 2010. (Best Student Paper Award Runner-up)

• R. Bramandia, J. Cheng, B. Choi and J. X. Yu. "Optimizing Updates of Recursive XML Views of Relations." VLDB Journal, 18(5): 1313-1333, 2009.
• J. Yu, J. Guan, J. Xu, and S. Zhou. "Towards Keyword Search over Relational Databases in DHT Networks." Proc. the 15th Int. Conf. on Parallel and Distributed Systems (ICPADS '09), pages 449-455, Dec. 2009.
• X. Pan, X. Meng, and J. Xu. "Distortion-based Anonymity for Continuous Queries in Location-Based Mobile Services." Proc. the 17th ACM SIGSPATIAL Int'l Conference on Advances in Geographic Info rmation Systems (ACM GIS '09), Seattle, USA, November 2009.
• Y. Tang, J. Xu, S. Zhou, and W.-C. Lee. "m-LIGHT: Indexing Multi-Dimensional Data over DHTs." Proc. the 29th IEEE Int'l Conference on Distributed Computing Systems (ICDCS '09), Montreal, Quebec, Canada, May 2009. [pdf]
• Y. Li, S. T. On, J. Xu, B. Choi, and H. Hu. "DigestJoin: Exploiting Fast Random Reads for Flash-based Joins." Proc. the 10th International Conference on Mobile Data Management (MDM '09), Taipei, Taiwan, May 2009. [pdf]
• S. T. On, H. Hu, Y. Li, and J. Xu. "Lazy-Update B+-Tree for Flash Devices." Proc. the 10th International Conference on Mobile Data Management (MDM '09), Taipei, Taiwan, May 2009. [pdf]
• H. Hu and J. Xu. "Non-Exposure Location Anonymity." Proc. IEEE 25th International Conference on Data Engineering (ICDE '09), Shanghai, China, March 2009. [pdf]
  

• X. Tang, J. Xu, and W.-C. Lee. "Analysis of TTL-Based Consistency in Unstructured Peer-to-Peer Networks." IEEE Transactions on Parallel and Distributed Systems (TPDS), 19(12): 1683-1694, Dec. 2008. [pdf]
• X. Tang and J. Xu. "Optimizing Lifetime for Continuous Data Aggregation with Precision Guarantees in Wireless Sensor Networks." IEEE/ACM Transactions on Networking (ToN), 16(4): 904-917, August 2008. [pdf]
• X. Tang and J. Xu. "Adaptive Data Collection Strategies for Lifetime-Constrained Wireless Sensor Networks." IEEE Transactions on Parallel and Distributed Systems (TPDS), 19(6): 721-734, June 2008. [pdf]
• J. Xu, X. Tang, and W.-C. Lee. "A New Storage Scheme for Approximate Location Queries in Object Tracking Sensor Networks." IEEE Transactions on Parallel and Distributed Systems (TPDS), 19(2): 262-275, Feb. 2008. [pdf]
• B. Choi, G. Cong, W. Fan and S. D. Viglas. "Updating Recursive XML Views of Relations." Journal of Computer Science and Technology (JCST), 23(4): 516-537, July 2008.
• D. Wang, J. Xu, J.-C. Liu, and F. Wang. "Mobile Filtering for Error-Bounded Data Collection in Sensor Networks." Proc. the 28th IEEE Int. Conf. on Distributed Computing Systems (ICDCS '08), Beijing, China, June 2008. [pdf]
• X. Pan, J. Xu, X. Meng. "Protecting Location Privacy against Location-Dependent Attack in Mobile Services." ACM CIKM '08, Napa Valley, CA, Oct. 2008. (Poster Paper)
• N. Tang, J. X. Yu, M. T. Ozsu, B. Choi and K-F. Wong. "Multiple Materialized View Selection for XPath Query Rewriting." Proc. IEEE 24th International Conference on Data Engineering (ICDE '08), Cancun, Mexico, April 2008, Page 873-882.
• D. Wang, J. Xu, J.-C. Liu, and F. Wang. "Mobile Filter: Exploring Migration of Filters for Error-Bounded Data Collection in Sensor Networks." Proc. IEEE 24th International Conference on Data Engineering (ICDE '08), Cancun, Mexico, April 2008. (Poster Paper) [pdf]

• M. Wu, J. Xu, X. Tang, and W.-C. Lee. "Top-k Monitoring in Wireless Sensor Networks." IEEE Transactions on Knowledge and Data Engineering (TKDE), 19(7): 962-976, July 2007. [pdf]
• J. Xu, W.-C. Lee, X. Tang, Q. Gao, and S. Li. "An Error-Resilient and Tunable Distributed Indexing Scheme for Wireless Data Broadcast." IEEE Transactions on Knowledge and Data Engineering (TKDE), 18(3): 392-404, March 2006. [pdf]
• J. Xu, X. Tang, and W.-C. Lee. "Scheduling Time-Critical On-Demand Broadcast: Algorithms, Analysis, and Performance Evaluation." IEEE Transactions on Parallel and Distributed Systems (TPDS), 17(1): 3-14, Jan. 2006. [pdf]
• B. Zheng, J. Xu, W.-C. Lee, and D. L. Lee. "Grid-Partition Index: A Hybrid Method for Nearest-Neighbor Queries in Wireless Location-Based Services." VLDB Journal (VLDBJ), 15(1):21-39, Jan. 2006. [pdf]
• J. Xu, B. Zheng, W.-C. Lee, and D. L. Lee. "The D-tree: An Index Structure for Planar Point Queries in Location-Based Wireless Services." IEEE Transactions on Knowledge and Data Engineering (TKDE), 16(12): 1526-1542, Dec. 2004. [pdf]
• J. Xu, Q. Hu, W.-C. Lee, and D. L. Lee. "Performance Evaluation of an Optimal Cache Replacement Policy for Wireless Data Dissemination." IEEE Transactions on Knowledge and Data Engineering (TKDE), 16(1): 125-139, Jan. 2004. [pdf]
• J. Xu, X. Tang, and D. L. Lee. "Performance Analysis of Location-Dependent Cache Invalidation Schemes for Mobile Environments." IEEE Transactions on Knowledge and Data Engineering (TKDE), 15(2): 474-488, March/April 2003. [pdf]
• X. Tang and J. Xu. "Extending Network Lifetime for Precision-Constrained Data Aggregation in Wireless Sensor Networks." INFOCOM '06, Barcelona, Spain, April 2006. [pdf]
• Y. Xu, W.-C. Lee, J. Xu, and G. Mitchel. "Processing Window Queries in Wireless Sensor Networks." Proc. the 22nd IEEE Int. Conf. on Data Engineering (ICDE '06), Atlanta, GA, April 2006. [pdf]
• H. Hu, J. Xu, and D. L. Lee. "A Generic Framework for Monitoring Continuous Spatial Queries over Moving Objects." Proc. the ACM SIGMOD Conference (SIGMOD '05), Baltimore, MD, June 2005. [pdf]
• H. Hu, J. Xu, W. S. Wong, B. Zheng, D. L. Lee, and W.-C. Lee. "Proactive Caching for Spatial Queries in Mobile Environments." Proc. the 21th IEEE Int. Conf. on Data Engineering (ICDE '05), Tokyo, Japan, April 2005. [pdf]
• J. Xu, W.-C. Lee, and X. Tang. "Exponential Index: A Parameterized Distributed Indexing Scheme for Data on Air." Proc. the 2nd ACM/USENIX Int. Conf. on Mobile Systems, Applications, and Services (MobiSys '04), Boston, MA, June 2004, pp. 153 - 164. [pdf]
• X. Tang and J. Xu. "On Replica Placement for QoS-Aware Content Distribution." INFOCOM '04, Hong Kong, March 2004, pp. 806-815. [pdf]
• J. Xu, B. Zheng, W.-C. Lee, and D. L. Lee. "Energy Efficient Index for Querying Location-Dependent Data in Mobile Broadcast Environments." Proc. the 19th IEEE Int. Conf. on Data Engineering (ICDE '03), Bangalore, India, March 2003, pp. 239-250. [pdf]