I am a Professor of Computer Science
at the University of Copenhagen and faculty affiliate
at Aarhus University .
In my research I design robust and versatile methods for data access, mining, and representation.
I received the MSc in Electrical and Computer Engineering from the
National Technical University of Athens , the PhD in Computer Science from the
University of Hong Kong , and
the 2008 Young Scientist Award in Physical/Mathematical Science from
HKIS .
In the past I have held positions at
Aalborg University ,
Skoltech ,
Rutgers ,
NUS ,
the University of Zurich , and
DTU .
I am looking for motivated PhD students.
Refereed Conference and Journal Articles
Spectral Subgraph Localization Proc.
of the 2nd Learning on Graphs Conference
(LoG ),
Virtual Event, November 2023
k -Best Egalitarian Stable Marriages for Task AssignmentProc.
of the VLDB Endowment (PVLDB ), 16(11), 2023
(49th VLDB Conf., Vancouver, Canada, August 2023)
Adaptive Indexing in High-Dimensional Metric Spaces Proc.
of the VLDB Endowment (PVLDB ), 16(10), 2023
(49th VLDB Conf., Vancouver, Canada, August 2023)
Adaptive Indexing of Objects with Spatial Extent Proc.
of the VLDB Endowment (PVLDB ), 16(9), 2023
(49th VLDB Conf., Vancouver, Canada, August 2023)
Marigold: Efficient k -means Clustering in High Dimensions Proc.
of the VLDB Endowment (PVLDB ), 16(7), 2023
(49th VLDB Conf., Vancouver, Canada, August 2023)
SIFTER: Space-Efficient Value Iteration for Finite-Horizon MDPs Proc.
of the VLDB Endowment (PVLDB ), 16(1), 2022
(49th VLDB Conf., Vancouver, Canada, August 2023)
Holistic Prediction on a Time-Evolving Attributed Graph Proc.
of the 61st Annual Meeting of the Association for Computational Linguistics
(ACL ),
Toronto, Canada, July 2023
Atrapos: Real-time Evaluation of Metapath Qery Workloads Proc.
of the 32nd ACM Web Conference
(WWW ),
Austin, Texas, May 2023
GRASP: Scalable Graph Alignment by Spectral Corresponding Functions ACM
Transactions on Knowledge Discovery from Data (TKDD ), 17(4), May 2023
Comprehensive Evaluation of Algorithms for Unrestricted Graph Alignment Proc.
of the 26th Intl Conf. on Extending Database Technology
(EDBT ),
Ioannina, Greece, March 2023
Maximizing the Probability of Fixation in the Positional Voter Model Proc.
of the 37th AAAI Conf. on Artificial Intelligence
(AAAI ),
Washington, DC, USA, February 2023
On the Robustness of Diffusion in a Network Under Node Attacks IEEE
Transactions on Knowledge and Data Engineering (TKDE ), 34(12), December 2022
One-off Disclosure Control by Heterogeneous Generalization Proc.
of the 31st USENIX Security Symposium,
Boston, MA, August 2022
Invasion Dynamics in the Biased Voter Process Proc.
of the 31st Intl Joint Conf. on Artificial Intelligence
(IJCAI ),
Vienna, Austria, July 2022
A Content Recommendation Policy for Gaining Subscribers Proc.
of the 45th ACM SIGIR Intl Conf. on Research and Development in Information Retrieval
(SIGIR ),
Madrid, Spain, July 2022
SIEVE: A Space-Efficient Algorithm for Viterbi Decoding Proc.
of the 2022 ACM SIGMOD Intl Conf. on Management of Data
(SIGMOD ),
Philadelphia, PA, June 2022
Fixation Maximization in the Positional Moran Process Proc.
of the 36th AAAI Conf. on Artificial Intelligence
(AAAI ),
Virtual Event, February 2022
Sparse Shield: Social Network Immunization vs. Harmful Speech Proc.
of the 30th ACM Conf. on Information and Knowledge Management
(CIKM ),
Virtual Event, Queensland, Australia, November 2021
Centerpoint Query Authentication Proc.
of the 30th ACM Conf. on Information and Knowledge Management
(CIKM ),
Virtual Event, Queensland, Australia, November 2021
Boosting Graph Alignment Algorithms Proc.
of the 30th ACM Conf. on Information and Knowledge Management
(CIKM ),
Virtual Event, Queensland, Australia, November 2021
GRASP: Graph Alignment Through Spectral Signatures Proc. of
the 5th Intl Conf. on Web and Big Data
(APWeb-WAIM ),
Guangzhou, China, August 2021
Finding Geo-Social Cohorts in Location-Based Social Networks Proc. of
the 5th Intl Conf. on Web and Big Data
(APWeb-WAIM ),
Guangzhou, China, August 2021
FREDE: Anytime Graph Embeddings Proc.
of the VLDB Endowment (PVLDB ), 14(6), 2021
(47th VLDB Conf., Copenhagen, August 2021)
Context-aware Outstanding Fact Mining from Knowledge Graphs Proc.
of the 27th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining
(KDD ),
Virtual Event, Singapore, August 2021
A Deep Learning Architecture for Audience Interest Prediction of News Topic on Social Media Proc.
of the 24th Intl Conf. on Extending Database Technology
(EDBT ),
Virtual Event, Cyprus, March 2021
Revisiting Multidimensional Adaptive Indexing Proc.
of the 24th Intl Conf. on Extending Database Technology
(EDBT ),
Virtual Event, Cyprus, March 2021
Indoor Quality-of-position Visual Assessment Using Crowdsourced Fingerprint Maps ACM
Transactions on Spatial Algorithms and Systems (TSAS ), 7(2), February 2021
Selecting Influential Features by a Learnable Content-Aware Linear Threshold Model Proc.
of the 29th ACM Conf. on Information and Knowledge Management
(CIKM ),
Virtual Event, Ireland, October 2020
Geodemographic Influence Maximization Proc.
of the 26th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining
(KDD ),
Virtual Event, August 2020
The Shape of Data: Intrinsic Distance for Data Distributions Proc.
of the 8th Intl Conf. on Learning Representations
(ICLR ),
Addis Ababa, Ethiopia, April 2020
On the Robustness of Cascade Diffusion under Node Attacks Proc.
of the 29th Intl World Wide Web Conf.
(WWW ),
Taipei, April 2020
Revisiting the Theory and Practice of Database Cracking Proc.
of the 23rd Intl Conf. on Extending Database Technology
(EDBT ),
Copenhagen, Denmark, March 2020
Fair Procedures for Fair Stable Marriage Outcomes Proc.
of the 34th AAAI Conf. on Artificial Intelligence
(AAAI ),
New York, February 2020
Equitable Stable Matchings in Quadratic Time Proc.
of the 33rd Conf. on Neural Information Processing Systems
(NeurIPS ),
Vancouver, Canada, December 2019
Figuring out the User in a Few Steps: Bayesian Multifidelity Active Search with Cokriging Proc.
of the 25th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining
(KDD ),
Anchorage, Alaska, August 2019
Maximizing Multifaceted Network Influence Proc.
of the 35th IEEE Intl Conf. on Data Engineering
(ICDE ),
Macau, China, April 2019
Multicapacity Facility Selection in Networks Proc.
of the 35th IEEE Intl Conf. on Data Engineering
(ICDE ),
Macau, China, April 2019
An Experimental Study of Network Immunization Proc.
of the 22nd Intl Conf. on Extending Database Technology
(EDBT ),
Lisbon, Portugal, March 2019
NetLSD: Hearing the Shape of a Graph Proc.
of the 24th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining
(KDD ),
London, United Kingdom, August 2018
VERSE: Versatile Graph Embeddings from Similarity Measures Proc.
of the 27th Intl World Wide Web Conf.
(WWW ),
Lyon, France, April 2018
Content Recommendation for Viral Social Influence Proc.
of the 40th ACM SIGIR Intl Conf. on Research and Development in Information Retrieval
(SIGIR ),
Tokyo, Japan, August 2017
Indoor Localization Accuracy Estimation from Fingerprint Data Proc.
of the 18th IEEE Intl Conf. on Mobile Data Management
(MDM ),
Daejeon, South Korea, May 2017
Harvester: Influence Optimization in Symmetric Interaction Networks Proc.
of the 3rd IEEE Intl Conf. on Data Science and Advanced Analytics
(DSAA ),
Montreal, Canada, October 2016
Adaptive Indexing over Encrypted Numeric Data Proc.
of the 2016 ACM SIGMOD Intl Conf. on Management of Data
(SIGMOD ),
San Francisco, California, June 2016
TRANSFORMERS: Robust spatial joins on non-uniform data distributions Proc.
of the 32nd IEEE Intl Conf. on Data Engineering
(ICDE ),
Helsinki, Finland, May 2016
Fuzzy trajectory linking Proc.
of the 32nd IEEE Intl Conf. on Data Engineering
(ICDE ),
Helsinki, Finland, May 2016
Collaborative Search Log Sanitization: Toward Differential Privacy and Boosted Utility IEEE
Transactions on Dependable and Secure Computing (TDSC ), 12(5), 2015
k -Anonymization by Freeform GeneralizationProc.
of the 10th ACM Symposium on Information, Computer and Communications Security
(AsiaCCS ),
Singapore, April 2015
An Equitable Solution to the Stable Marriage Problem Proc.
of the 27th IEEE Intl Conf. on Tools with Artificial Intelligence
(ICTAI ),
Vietri sul Mare, Italy, November 2015
Graph-Aware, Workload-Adaptive SPARQL Query Caching Proc.
of the 2015 ACM SIGMOD Intl Conf. on Management of Data
(SIGMOD ),
Melbourne, Australia, June 2015
L-opacity: Linkage-Aware Graph Anonymization Proc.
of the 17th Intl Conf. on Extending Database Technology
(EDBT ),
Athens, Greece, March 2014
On the Privacy and Utility of Anonymized Social Networks International Journal of Adaptive, Resilient and Autonomic Systems
(IJARAS ), 4(2), 2013
An effective and efficient parallel approach for random graphs generation over GPUs Journal of Parallel and Distributed Computing
(JPDC ), 73(3), March 2013
H2RDF+: High-performance Distributed Joins over Large-scale RDF Graphs Proc.
of the 2013 IEEE Intl Conf. on Big Data
(IEEE BigData ),
Santa Clara, California, October 2013
eSkyline: Processing Skyline Queries over Encrypted Data Proc.
of the 39th Intl Conf. on Very Large Data Bases
(VLDB ),
Riva del Garda, Italy, August 2013
TOUCH: In-Memory Spatial Join by Hierarchical Data-Oriented Partitioning Proc.
of the 2013 ACM SIGMOD Intl Conf. on Management of Data
(SIGMOD ),
New York, NY, June 2013
Publishing Microdata with a Robust Privacy Guarantee Proc.
of the VLDB Endowment (PVLDB ), 5(11), July 2012
(38th VLDB Conf., Istanbul, August 2012)
Stochastic Database Cracking: Towards Robust Adaptive Indexing in Main-Memory Column-Stores Proc.
of the VLDB Endowment (PVLDB ), 5(6), February 2012
(38th VLDB Conf., Istanbul, August 2012)
Delineating Social Network Data Anonymization via Random Edge Perturbation Proc.
of the 21st ACM Conf. on Information and Knowledge Management
(CIKM ),
Maui, Hawaii, October 2012
Discretionary Social Network Data Revelation with a User-Centric Utility Guarante Proc.
of the 21st ACM Conf. on Information and Knowledge Management
(CIKM ),
Maui, Hawaii, October 2012
Anonymizing Set-Valued Data by Nonreciprocal Recoding Proc.
of the 18th ACM SIGKDD Intl Conf. on Knowledge Discovery and Data Mining
(KDD ),
Beijing, China, August 2012
Cooperative Scalable Moving Continuous Query Processing Proc.
of the 13th IEEE Intl Conf. on Mobile Data Management
(MDM ),
Bengaluru, India, July 2012
Sensitive Label Privacy Protection on Social Network Data Proc.
of the 24th Intl Conf. on Scientific and Statistical Database Management
(SSDBM ),
Chania, Crete, Greece, June 2012
Scalable Parallel Minimum Spanning Forest Computation Proc.
of the 17th ACM SIGPLAN Symp. on Principles and Practice of Parallel Programming
(PPoPP ),
New Orleans, Louisiana, February 2012
Authenticated Multi-Step Nearest Neighbor Search IEEE
Transactions on Knowledge and Data Engineering (TKDE ), 23(5), May 2011
SABRE: A Sensitive Attribute Bucketization and REdistribution framework for t-closeness The VLDB Journal
(VLDBJ ), 20(1), February 2011
Utility-Driven Anonymization in Data Publishing Proc.
of the 20th ACM Conf. on Information and Knowledge Management
(CIKM ),
Glasgow, United Kingdom, October 2011
Scalable kNN Search on Vertically Stored Time Series Proc.
of the 17th ACM SIGKDD Intl Conf. on Knowledge Discovery and Data Mining
(KDD ),
San Diego, California, August 2011
Fast Random Graph Generation Proc. of
the 14th Intl Conf. on Extending Database Technology
(EDBT ), Uppsala, Sweden, March 2011
ρ-uncertainty: Inference-Proof Transaction Anonymization Proc.
of the VLDB Endowment (PVLDB ), 3(1)
(36th VLDB Conf., Singapore, September 2010)
CW2I: Community Data Indexing for Complex Query Processing Proc.
of the 11th Intl Conf. on Web-Age Information Management (WAIM),
Jiuzhaigou, China, July 2010
Local Search in Histogram Construction Proc.
of the 24th AAAI Conf. on Artificial Intelligence (AAAI ),
Atlanta, Georgia, July 2010
Optimality and Scalability in Lattice Histogram Construction Proc.
of the VLDB Endowment (PVLDB ), 2(1)
(35th VLDB Conf., Lyon, France, August 2009)
A Framework for Efficient Data Anonymization under Privacy and Accuracy Constraints ACM
Transactions on Data Base Systems (TODS ), 34(2), June 2009
Fast and Effective Histogram Construction Proc.
of the 18th ACM Conf. on Information and Knowledge Management (CIKM ),
Hong Kong, China, November 2009
Multiplicative Synopses for Relative-Error Metrics Proc. of
the 12th Intl Conf. on Extending Database Technology
(EDBT ),
Saint-Petersburg, Russia, March 2009
Hexastore: Sextuple Indexing for Semantic Web Data Management Proc.
of the VLDB Endowment (PVLDB ), 1(1)
(34th VLDB Conf., Auckland, New Zealand, August 2008)
Hierarchical Synopses with Optimal Error Guarantees [appendix ]ACM
Transactions on Data Base Systems (TODS ), 33(3), August 2008
Lattice Histograms: a Resilient Synopsis Structure Proc. of
the 24th IEEE Intl Conf. on Data Engineering
(ICDE ),
Cancún, Mexico, April 2008
Common Influence Join: A Natural Join Operation for Spatial Pointsets Proc. of
the 24th IEEE Intl Conf. on Data Engineering
(ICDE ),
Cancún, Mexico, April 2008
Ring-constrained Join: Deriving Fair Middleman Locations from Pointsets via a Geometric Constraint Proc. of
the 11th Intl Conf. on Extending Database Technology
(EDBT ),
Nantes, France, March 2008
Fast Anonymization with Low Information Loss Proc.
of the 33rd Intl Conf. on Very Large Data Bases
(VLDB ),
Vienna, September 2007
Exploiting Duality in Summarization with Deterministic Guarantees Proc.
of the 13th ACM SIGKDD Intl Conf. on Knowledge Discovery and Data Mining
(KDD ),
San Jose, California, August 2007
The Haar+ Tree: a Refined Synopsis Data Structure Proc.
of the 23rd IEEE Intl Conf. on Data Engineering
(ICDE ),
Istanbul, April 2007
Detecting the Direction of Motion in a Binary Sensor Network Proc.
of the 1st IEEE Intl Conf. on Sensor Networks, Ubiquitous, and Trustworthy Computing
(SUTC ),
Taichung, June 2006
One-Pass Wavelet Synopses for Maximum-Error Metrics Proc.
of the 31st Intl Conf. on Very Large Data Bases
(VLDB ),
Trondheim, Norway, August 2005
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