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Note: Links lead to the DBLP on the Web. Walid G. Aref Mohamed G. Elfeky , Walid G. Aref, Ahmed K. Elmagarmid : Using Convolution to Mine Obscure Periodic Patterns in One Pass. EDBT 2004 : 605-620 Mohamed F. Mokbel , Ming Lu , Walid G. Aref: Hash-Merge Join: A Non-blocking Join Algorithm for Producing Fast and Early Join Results. ICDE 2004 : 251-263 Thanaa M. Ghanem , Rahul Shah , Mohamed F. Mokbel , Walid G. Aref, Jeffrey Scott Vitter : Bulk Operations for Space-Partitioning Trees. ICDE 2004 : 29-41 Mohamed F. Mokbel , Walid G. Aref, Khaled M. Elbassioni , Ibrahim Kamel : Scalable Multimedia Disk Scheduling. ICDE 2004 : 498-509 Moustafa A. Hammad , Mohamed F. Mokbel , M. H. Ali , Walid G. Aref, Ann Christine Catlin , Ahmed K. Elmagarmid , M. Eltabakh , Mohamed G. Elfeky , Thanaa M. Ghanem , R. Gwadera , Ihab F. Ilyas , Mirette S. Marzouk , X. Xiong : Nile: A Query Processing Engine for Data Streams. ICDE 2004 : 851 Ihab F. Ilyas , Rahul Shah , Walid G. Aref, Jeffrey Scott Vitter , Ahmed K. Elmagarmid : Rank-aware Query Optimization. SIGMOD Conference 2004 Mohamed F. Mokbel , Xiaopeng Xiong , Walid G. Aref: SINA: Scalable Incremental Processing of Continuous Queries in Spatio-temporal Databases. SIGMOD Conference 2004 Thanaa M. Ghanem , Walid G. Aref: Databases Deepen the Web. IEEE Computer 37 (1): 116-117 (2004) Walid G. Aref, Mohamed G. Elfeky , Ahmed K. Elmagarmid : Incremental, Online, and Merge Mining of Partial Periodic Patterns in Time-Series Databases. IEEE Trans. Knowl. Data Eng. 16 (3): 332-342 (2004) Mohamed F. Mokbel , Walid G. Aref, Susanne E. Hambrusch , Sunil Prabhakar : Towards scalable location-aware services: requirements and research issues. GIS 2003 : 110-117 Xingquan Zhu , Walid G. Aref, Jianping Fan , Ann Christine Catlin , Ahmed K. Elmagarmid : Medical Video Mining for Efficient Database Indexing, Management and Access. ICDE 2003 : 569-580 Mohamed F. Mokbel , Walid G. Aref, Ananth Grama : Spectral LPM: An Optimal Locality-Preserving Mapping using the Spectral (not Fractal) Order. ICDE 2003 : 699-701 Walid G. Aref, Moustafa A. Hammad , Ann Christine Catlin , Ihab F. Ilyas , Thanaa M. Ghanem , Ahmed K. Elmagarmid , Mirette S. Marzouk : Video query processing in the VDBMS testbed for video database research. MMDB 2003 : 25-32 Moustafa A. Hammad , Walid G. Aref, Ahmed K. Elmagarmid : Stream Window Join: Tracking Moving Objects in Sensor-Network Databases. SSDBM 2003 : 75-84 Mohamed F. Mokbel , Walid G. Aref: On Querz Processing and Optimality Using Spectral Locality-Preserving Mappings. SSTD 2003 : 102-121 Moustafa A. Hammad , Michael J. Franklin , Walid G. Aref, Ahmed K. Elmagarmid : Scheduling for shared window joins over data streams. VLDB 2003 : 297-308 Ihab F. Ilyas , Walid G. Aref, Ahmed K. Elmagarmid : Supporting Top-k Join Queries in Relational Databases. VLDB 2003 : 754-765 Mohamed F. Mokbel , Walid G. Aref, Ibrahim Kamel : Analysis of Multi-Dimensional Space-Filling Curves. GeoInformatica 7 (3): 179-209 (2003) Mohamed F. Mokbel , Thanaa M. Ghanem , Walid G. Aref: Spatio-Temporal Access Methods. IEEE Data Eng. Bull. 26 (2): 40-49 (2003) Mohamed F. Mokbel , Walid G. Aref, Ibrahim Kamel : Performance of multi-dimensional space-filling curves. ACM-GIS 2002 : 149-154 Dmitri V. Kalashnikov , Sunil Prabhakar , Susanne E. Hambrusch , Walid G. Aref: Efficient Evaluation of Continuous Range Queries on Moving Objects. DEXA 2002 : 731-740 Xingquan Zhu , Jianping Fan , Walid G. Aref, Ahmed K. Elmagarmid : ClassMiner: Mining Medical Video Content Structure and Events Towards Efficient Access and Scalable Skimming. DMKD 2002 Christos Berberidis , Walid G. Aref, Mikhail J. Atallah , Ioannis P. Vlahavas , Ahmed K. Elmagarmid : Multiple and Partial Periodicity Mining in Time Series Databases. ECAI 2002 : 370-374 Walid G. Aref, Ann Christine Catlin , Ahmed K. Elmagarmid , Jianping Fan , J. Guo , Moustafa A. Hammad , Ihab F. Ilyas , Mirette S. Marzouk , S. Prabhakar , Abdelmounaam Rezgui , S. Teoh , Evimaria Terzi , Y. Tu , Athena Vakali , Xingquan Zhu : A Distributed Database Server for Continuous Media. ICDE 2002 : 490-491 Walid G. Aref, Khaled El-Bassyouni , Ibrahim Kamel , Mohamed F. Mokbel : Scalable QoS-Aware Disk-Scheduling. IDEAS 2002 : 256-265 Walid G. Aref, Ann Christine Catlin , Jianping Fan , Ahmed K. Elmagarmid , Moustafa A. Hammad , Ihab F. Ilyas , Mirette S. Marzouk , Xingquan Zhu : A Video Database Management System for Advancing Video Database Research. Multimedia Information Systems 2002 : 8-17 Christos Berberidis , Ioannis P. Vlahavas , Walid G. Aref, Mikhail J. Atallah , Ahmed K. Elmagarmid : On the Discovery of Weak Periodicities in Large Time Series. PKDD 2002 : 51-61 Ihab F. Ilyas , Walid G. Aref, Ahmed K. Elmagarmid : Joining Ranked Inputs in Practice. VLDB 2002 : 950-961 Sunil Prabhakar , Yuni Xia , Dmitri V. Kalashnikov , Walid G. Aref, Susanne E. Hambrusch : Query Indexing and Velocity Constrained Indexing: Scalable Techniques for Continuous Queries on Moving Objects. IEEE Trans. Computers 51 (10): 1124-1140 (2002) F. A. Kokkoras , Haitao Jiang , Ioannis P. Vlahavas , Ahmed K. Elmagarmid , Elias N. Houstis , Walid G. Aref: Smart VideoText: a video data model based on conceptual graphs. Multimedia Syst. 8 (4): 328-338 (2002) Walid G. Aref: ACM-GIS 2001, Proceedings of the Ninth ACM International Symposium on Advances in Geographic Information Systems, Atlanta, GA, USA, November 9-10, 2001 ACM 2001 Mohamed F. Mokbel , Walid G. Aref: Irregularity in Multi-Dimensional Space-Filling Curves with Applications in Multimedia Databases. CIKM 2001 : 512-519 Walid G. Aref, Ihab F. Ilyas : An Extensible Index for Spatial Databases. SSDBM 2001 : 49-58 Susanne E. Hambrusch , Chuan-Ming Liu , Walid G. Aref, Sunil Prabhakar : Query Processing in Broadcasted Spatial Index Trees. SSTD 2001 : 502-521 James Joshi , Walid G. Aref, Arif Ghafoor , Eugene H. Spafford : Security models for web-based applications. Commun. ACM 44 (2): 38-44 (2001) Husni Fahmi , Walid G. Aref, Mudassir Latif , Basit Shafiq , Arif Ghafoor , Peiya Liu , Liang Hsu : Distributed web-based framework for real-time multimedia object communication. Comput. Syst. Sci. Eng. 16 (2): 79-88 (2001) Ashraf Aboulnaga , Walid G. Aref: Window Query Processing in Linear Quadtrees. Distributed and Parallel Databases 10 (2): 111-126 (2001) James Joshi , Arif Ghafoor , Walid G. Aref, Eugene H. Spafford : Digital Government Security Infrastructure Design Challenges. IEEE Computer 34 (2): 66-72 (2001) Walid G. Aref, Ibrahim Kamel , Shahram Ghandeharizadeh : Disk Scheduling in Video Editing Systems. IEEE Trans. Knowl. Data Eng. 13 (6): 933-950 (2001) Walid G. Aref, Ihab F. Ilyas : SP-GiST: An Extensible Database Index for Supporting Space Partitioning Trees. J. Intell. Inf. Syst. 17 (2-3): 215-240 (2001) Jianping Fan , Walid G. Aref, Mohand-Said Hacid , Ahmed K. Elmagarmid : An improved automatic isotropic color edge detection technique. Pattern Recognition Letters 22 (13): 1419-1429 (2001) Elisa Bertino , Moustafa A. Hammad , Walid G. Aref, Ahmed K. Elmagarmid : An Access Control Model for Video Database Systems. CIKM 2000 : 336-343 Walid G. Aref, Ibrahim Kamel : On Multi-dimensional Sorting Orders. DEXA 2000 : 774-783 Husni Fahmi , Walid G. Aref, Mudassir Latif , Arif Ghafoor , Peiya Liu , Liang Hsu : Distributed Framework for Real-Time Multimedia Object Communication. ISORC 2000 : 252-259 Wael M. Badawy , Walid G. Aref: On Local Heuristics to Speed Up Polygon-Polygon Intersection Tests. ACM-GIS 1999 : 97-102 Walid G. Aref, Daniel Barbará : Supporting Electronic Ink Databases. Inf. Syst. 24 (4): 303-326 (1999) Walid G. Aref, Hanan Samet : Efficient Window Block Retrieval in Quadtree-Based Spatial Databases. GeoInformatica 1 (1): 59-91 (1997) Walid G. Aref, Hanan Samet : Cascaded Spatial Join Algorithms with Spatially Sorted Output. ACM-GIS 1996 : 17-24 Walid G. Aref, Daniel Barbará , Daniel P. Lopresti : Ink as a First-Class Datatype in Multimedia Databases. Multimedia Database System: Issues and Research Direction 1996 : 113-163 Walid G. Aref, Hanan Samet : A Window Retrieval Algorithm for Spatial Databases Using Quadtrees. ACM-GIS 1995 : 69- Walid G. Aref, Daniel Barbará , Stephen Johnson , Sharad Mehrotra : Efficient Processing of Proximity Queries for Large Databases. ICDE 1995 : 147-154 Walid G. Aref, Daniel Barbará , Padmavathi Vallabhaneni : The Handwritten Trie: Indexing Electronic Ink. SIGMOD Conference 1995 : 151-162 Hanan Samet , Walid G. Aref: Spatial Data Models and Query Processing. Modern Database Systems 1995 : 338-360 Walid G. Aref, Ibrahim Kamel , Daniel P. Lopresti : On Handling Electronic Ink. ACM Comput. Surv. 27 (4): 564-567 (1995) Walid G. Aref, Hanan Samet : An Algorithm for Perspective Viewing of Objects Represented by Octrees. Comput. Graph. Forum 14 (1): 59-66 (1995) Walid G. Aref, Hanan Samet : A Cost Model for Query Optimization Using R-Trees. ACM-GIS 1994 : 0- Walid G. Aref, Hanan Samet : Hashing by Proximity to Process Duplicates in Spatial Databases. CIKM 1994 : 347-354 Walid G. Aref, Hanan Samet : Estimating Selectivity Factors of Spatial Operations. FMLDO 1993 : 31-43 Walid G. Aref, Hanan Samet : Decomposing a Window into Maximal Quadtree Blocks. Acta Inf. 30 (5): 425-439 (1993) Walid G. Aref, Hanan Samet : Extending a DBMS with Spatial Operations. SSD 1991 : 299-318 Walid G. Aref, Hanan Samet : Optimization for Spatial Query Processing. VLDB 1991 : 81-90 Walid G. Aref, Hanan Samet : Efficient Processing of Window Queries in The Pyramid Data Structure. 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