People
Faculty Members
Donghui Zhang |
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Professor Zhang's primary research area is Database Systems. He has researched on Temporal, spatial and spatio-temporal database indexing, aggregation queries and join processing; efficiently storing and querying XML documents which evolve over time. His current research interests include data streams, indexing and querying moving objects, image database processing, biological data processing.
Professor Zhang earned his Ph.D. in August 2002. His dissertation title is "Aggregation Computation over Complex Objects". In it, he addressed the problem of computing aggregates over a large set of temporal and spatial objects. He proposed algorithms to compute such queries in logarithmic time, while previous approaches have linear performance.
Career Publication Highlights
D. Zhang, D. Gunopulos, V. J. Tsotras and B. Seeger, ``Temporal and Spatio-Temporal Aggregations over Data Streams using Multiple Time Granularities'', Journal of Information Systems, vol. 27, no. 8, 2002.
D. Zhang and V. J. Tsotras, ``Optimizing Spatial Min/Max Aggregations'', Journal of Information Sciences, to appear.
D. Zhang, V. J. Tsotras and D. Gunopulos, ``Efficient Aggregation over Objects with Extent'', Proc. of 21th ACM International SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS), Madison, Wisconsin, 2002.