English 中文版


首页 > 学术活动


来源:时间:2017-06-05 14:06:38浏览量:0

Efficient Processing of Spatio-Textual Queries

报告人:Prof. Dr. Timos Sellis





As a result of the increasing popularity of GPS enabled mobile devices, the volume of content associated with both a geographic location and a text description is growing rapidly on the web. The availability of this data enables us to answer many real-life spatial-textual queries for different applications. This research addresses the increasing demand of answering real-life queries that are useful, especially in business and marketing applications. In addition, the need to improve the performance while processing a large number of queries together arising in many problems. Specifically, the following questions are addressed in this research:

1)    How can multiple Top-k Spatial-Textual queries be efficiently batch processed?

2)    How can Maximizing the Bichromatic Reverse Spatial-textual k Nearest Neighbor queries be answered efficiently?

3)    How can the top-m objects with the highest aggregate spatial rank be continuously monitored for streaming queries?

(Joint work with Farhana M. Choudhury, J. Shane Culpepper and Zhifeng Bao)



Timos Sellis is a Professor and Director of Swinburne Data Science Research Institute at Swinburne University of Technology, Australia. He got his Diploma degree in Electrical Engineering in 1982 from the National Technical University of Athens (NTUA), Greece. In 1983 he got the M.Sc. degree from Harvard University and in 1986 the Ph.D. degree from the University of California at Berkeley, both in Computer Science. In 1986, he joined the Department of Computer Science of the University of Maryland, College Park as an Assistant Professor, and became an Associate Professor in 1992. Between 1992 and 1996 he was an Associate Professor at NTUA, where he served as a Professor till January 2013. He is currently a Professor at the School of Software and Electrical Engineering of Swinburne University of Technology in Australia. Prof. Sellis was also the Director of a new research institute he founded in Greece, the Institute for the Management of Information Systems (IMIS) of the "Athena" Research Center (www.imis.athena-innovation.gr) between 2007 and 2012. At Swinburne, he is also the director of the recently established Swinburne Data Science Research Institute.

His research interests include big data, data streams, personalization, data integration, and spatio- temporal database systems. He has published over 200 articles in refereed journals and international conferences in the above areas, has over 13,100 citations to his work and has been invited speaker in major international events. He has also participated and co-ordinated several national and european research projects. Prof. Sellis is a recipient of the prestigious Presidential Young Investigator (PYI) award given by the President of USA to the most talented new researchers (1990), and of the VLDB 1997 10 Year Paper Award in 1997 (awarded to the paper published in the proceedings of the VLDB 1987 conference that had the biggest impact in the field of database systems in the decade 1987-97).   He was the president of the National Council for Research and Technology of Greece (2001-2003). In November 2009, he was awarded the status of IEEE Fellow, for his contributions to database query optimization, and spatial data management, and in November 2013 the status of ACM Fellow, for his contributions to database query optimization, spatial data management, and data warehousing.