A
Apostolos N. Papadopoulos
Researcher at Aristotle University of Thessaloniki
Publications - 149
Citations - 3080
Apostolos N. Papadopoulos is an academic researcher from Aristotle University of Thessaloniki. The author has contributed to research in topics: Nearest neighbor search & Skyline. The author has an hindex of 26, co-authored 142 publications receiving 2791 citations.
Papers
More filters
Book
R-Trees: Theory and Applications
TL;DR: This book provides an extensive survey of the R-tree evolution, studying the applicability of the structure & its variations to efficient query processing, accurate proposed cost models, & implementation issues like concurrency control and parallelism.
Journal ArticleDOI
Collaborative recommender systems: Combining effectiveness and efficiency
TL;DR: This paper brings to surface factors that affect CF process in order to identify existing false beliefs and proposes new approaches that substantially improve the performance of CF algorithms.
Proceedings ArticleDOI
Continuous monitoring of distance-based outliers over data streams
Maria Kontaki,Anastasios Gounaris,Apostolos N. Papadopoulos,Kostas Tsichlas,Yannis Manolopoulos +4 more
TL;DR: New algorithms for continuous outlier monitoring in data streams, based on sliding windows are proposed, able to reduce the required storage overhead, run faster than previously proposed techniques and offer significant flexibility.
Book ChapterDOI
Performance of Nearest Neighbor Queries in R-Trees
TL;DR: This paper combines techniques that were inherently used for the analysis of range and spatial join queries, in order to derive measures regarding the performance of NN queries, to estimate the number of disk accesses introduced due to the processing of an NN query.
Proceedings ArticleDOI
Specifications for efficient indexing in spatiotemporal databases
TL;DR: The basic specifications such a spatiotemporal index structure should follow are introduced, existing proposals with respect to the above specifications are evaluated, and issues of interest involving object representation, query processing, and index maintenance are illustrated.