C
Christian S. Jensen
Researcher at Aalborg University
Publications - 541
Citations - 26166
Christian S. Jensen is an academic researcher from Aalborg University. The author has contributed to research in topics: Temporal database & Query language. The author has an hindex of 80, co-authored 507 publications receiving 24234 citations. Previous affiliations of Christian S. Jensen include University of Maryland, College Park & Zhejiang University.
Papers
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Journal Article
The COST benchmark : Comparison and evaluation of spatio-temporal indexes
TL;DR: This paper characterizes the spatio-temporal indexing problem and proposes a benchmark for the performance evaluation and comparison of spatio -temporal indexes, which takes into account that the available positions of the moving objects are inaccurate.
Proceedings ArticleDOI
Assessing the predictability of scheduled-vehicle travel times
TL;DR: A framework for evaluating various predictability types of the data independently of the model is proposed, and predictability analysis results of travel times are compared with the actual prediction errors for real bus trajectories.
Proceedings ArticleDOI
Expiration Times for Data Management
TL;DR: This paper presents a formal data model and a query algebra that handle expiration times transparently and declaratively and Notably, tuples are removed automatically from (materialised) query results as they expire in the (base) relations.
Proceedings ArticleDOI
A Clustering Approach to the Discovery of Points of Interest from Geo-Tagged Microblog Posts
TL;DR: A new clustering technique is proposed that takes into account both the spatial and textual attributes of microblog posts to obtain clusters that represent PoIs and expands clusters based on a proposed quality function that enables clusters of arbitrary shape and density.