N
Nikos Mamoulis
Researcher at University of Ioannina
Publications - 294
Citations - 12127
Nikos Mamoulis is an academic researcher from University of Ioannina. The author has contributed to research in topics: Joins & Spatial query. The author has an hindex of 56, co-authored 282 publications receiving 11121 citations. Previous affiliations of Nikos Mamoulis include University of Hong Kong & Max Planck Society.
Papers
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Proceedings ArticleDOI
Secure kNN computation on encrypted databases
TL;DR: A new asymmetric scalar-product-preserving encryption (ASPE) that preserves a special type of scalar product and is shown to resist practical attacks of a different background knowledge level, at a different overhead cost.
Book ChapterDOI
Query processing in spatial network databases
TL;DR: A Euclidean restriction and a network expansion framework that take advantage of location and connectivity to efficiently prune the search space are developed and applied to the most popular spatial queries.
Book ChapterDOI
On discovering moving clusters in spatio-temporal data
TL;DR: This work provides a formal definition for moving clusters and describes three algorithms for their automatic discovery, a straight-forward method based on the definition, a more efficient method which avoids redundant checks and an approximate algorithm which trades accuracy for speed by borrowing ideas from the MPEG-2 video encoding.
Journal ArticleDOI
Privacy-preserving anonymization of set-valued data
TL;DR: A new version of the k-anonymity guarantee is defined, the km-Anonymity, to limit the effects of the data dimensionality and two efficient algorithms to transform the database are proposed.
Proceedings ArticleDOI
Mining frequent spatio-temporal sequential patterns
TL;DR: This paper proposes algorithms to find patterns by employing a newly proposed substring tree structure and improving a priori technique, and defines pattern elements as spatial regions around frequent line segments.