Aris Gkoulalas-Divanis  Aris Gkoulalas-Divanis photo       

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Research Scientist, Lead Investigator, Data Privacy
IBM Research - Ireland
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Professional Associations:  ACM  |  ACM SIGIR  |  ACM SIGMOD  |  American Association for the Advancement of Sciences  |  Association for the Advancement of Artificial Intelligence (AAAI)  |  IEEE   |  IEEE Communications Society  |  IEEE Computer Society  |  Sigma Xi

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2014

Apriori-based algorithms for k m-anonymizing trajectory data
Giorgos Poulis, Spiros Skiadopoulos, Grigorios Loukides, Aris Gkoulalas-Divanis
Transactions on Data Privacy (TDP), 2014

Survey on Semantic Trajectories Modeling
Christine Parent, Stefano Spaccapietra, Chiara Renso, Gennady Andrienko, Natalya Andrienko, Vania Bogorny, Maria Luisa Damiani, Aris Gkoulalas-Divanis, Jose Macedo, Nikos Pelekis, others
ACM Computing Surveys, 2014

Informatics methods in medical privacy
Aris Gkoulalas-Divanis, Grigorios Loukides, Li Xiong, Jimeng Sun, Ada Wai-Chee Fu, Ke Wang, Raymond Chi-Wing Wong, Jia Wang, Minhao Jiang, Sheng Yu, others
Journal of biomedical informatics50, 1--3, Academic Press, 2014

Privacy Issues in Association Rule Mining
Aris Gkoulalas-Divanis, Jayant Haritsa, Murat Kantarcioglu
Frequent Pattern Mining, pp. 369--401, Springer, 2014

SPUD—Semantic Processing of Urban Data
Spyros Kotoulas, Vanessa Lopez, Raymond Lloyd, Marco Luca Sbodio, Freddy Lecue, Martin Stephenson, Elizabeth Daly, Veli Bicer, Aris Gkoulalas-Divanis, Giusy Di Lorenzo, Anika Schumann, Pol Mac Aonghusa
Web Semantics: Science, Services and Agents on the World Wide Web 24(0), 11 - 17, 2014
The Semantic Web Challenge 2012

Disassociation for Electronic Health Record Privacy
Grigorios Loukides, John Liagouris, Aris Gkoulalas-Divanis, Manolis Terrovitis
Journal of biomedical informatics, Elsevier, 2014

SECRETA: A System for Evaluating and Comparing RElational and Transaction Anonymization algorithms.
Giorgos Poulis, Aris Gkoulalas-Divanis, Grigorios Loukides, Spiros Skiadopoulos, Christos Tryfonopoulos
EDBT, pp. 620--623, 2014

Toward smarter healthcare: Anonymizing medical data to support research studies
A Gkoulalas-Divanis, G Loukides, J Sun
IBM Journal of Research and Development 58(1), 9--1, IBM, 2014

Cybersecurity for a Smarter Planet
MS Viveros, CC Palmer, AR Szakal, KJ Pearsall, A Gkoulalas-Divanis, P Mac Aonghusa, M Azua Himmel, F Grossman, DA Ortiz-Yepes, RJ Hermann, others
IBM Journal of Research and Development, 2014

Privacy protection in open information management platforms
Aris Gkoulalas-Divanis, Pol Mac Aonghusa
IBM Journal of Research and Development 58(1), 2014

Publishing data from electronic health records while preserving privacy: A survey of algorithms
Aris Gkoulalas-Divanis, Grigorios Loukides, Jimeng Sun
Journal of biomedical informatics, Elsevier, 2014

Large-Scale Data Analytics
Aris Gkoulalas-Divanis, Abderrahim Labbi
Divanis, A Labbi - 2014 - Springer, Springer


2013

Case Study on Electronic Medical Records Data
Aris Gkoulalas-Divanis, Grigorios Loukides
Anonymization of Electronic Medical Records to Support Clinical Analysis, pp. 55--64, Springer, 2013

Privacy-Aware Querying in Semantically-Enriched Trajectory Databases
Despina Kopanaki, Nikos Pelekis, Stelios Sideridis, Marios Vodas, Aris Gkoulalas-Divanis, Yannis Theodoridis
UNIPI-InfoLab-TR-2013-05. Available at: http://infolab. cs. unipi. gr/technical\_report s/TR-2013-05. pdf Category4

Overview of Patient Data Anonymization
Aris Gkoulalas-Divanis, Grigorios Loukides
Anonymization of Electronic Medical Records to Support Clinical Analysis, pp. 9--30, Springer, 2013

Re-identification of Clinical Data Through Diagnosis Information
Aris Gkoulalas-Divanis, Grigorios Loukides
Anonymization of Electronic Medical Records to Support Clinical Analysis, pp. 31--38, Springer, 2013

Preventing Re-identification While Supporting GWAS
Aris Gkoulalas-Divanis, Grigorios Loukides
Anonymization of Electronic Medical Records to Support Clinical Analysis, pp. 39--53, Springer, 2013

Predicting Changes in Hypertension Control using Electronic Health Records from a Chronic Disease Management Program
Jimeng Sun, Candace McNaughton, Ping Zhang, Adam Perer, Aris Gkoulalas-Divanis, Joshua Denny, Jacqueline Kirby, Thomas Lasko, Alexander Saip, Bradley Malin
Journal of the American Medical Informatics Association (JAMIA) 21(2), 337--344, BMJ Publishing Group Ltd, 2013
Abstract

Hiding Sensitive Patterns from Sequence Databases: Research Challenges and Solutions
Grigorios Loukides, Aris Gkoulalas-Divanis
Mobile Data Management (MDM), 2013 IEEE 14th International Conference on, pp. 45--50

Distance-Based k\^ m-Anonymization of Trajectory Data
Giorgos Poulis, Spiros Skiadopoulos, Grigorios Loukides, Aris Gkoulalas-Divanis
Mobile Data Management (MDM), 2013 IEEE 14th International Conference on, pp. 57--62

Anonymizing data with relational and transaction attributes
Giorgos Poulis, Grigorios Loukides, Aris Gkoulalas-Divanis, Spiros Skiadopoulos
Machine Learning and Knowledge Discovery in Databases, pp. 353--369, Springer, 2013

Report from Dagstuhl: the liberation of mobile location data and its implications for privacy research
Gennady L. Andrienko, Aris Gkoulalas-Divanis, Marco Gruteser, Christine Kopp, Thomas Liebig, Klaus Rechert
Mobile Computing and Communications Review 17(2), ACM, 2013

Select-Organize-Anonymize: A Framework for Trajectory Data Anonymization
G. Poulis, S. Skiadopoulos, G. Loukides, A. Gkoulalas-Divanis
Privacy Aspects of Data Mining (PADM), 2013

Permutation-based Sequential Pattern Hiding
R. Gwadera, A. Gkoulalas-Divanis, G. Loukides
IEEE International Conference on Data Mining (ICDM), 2013

Privacy Preservation in Open Data Portals: Research Challenges and Solutions in Designing an Urban Information Management Platform
A. Gkoulalas-Divanis, P. MacAonghusa
IBM Journal of Research & Technology, Special Issue on Cybersecurity for a Smarter Planet, 2013

Towards Improving Personalized Healthcare: Anonymization of Electronic Medical Records to Support Large-Scale Medical Studies
A. Gkoulalas-Divanis, G. Loukides, J. Sun
IBM Journal of Research & Technology, Special Issue on Cybersecurity for a Smarter Planet, IEEE, 2013

Semantic trajectories modeling and analysis
C Parent, S Spaccapietra, C Renso, G Andrienko, N Andrienko, V Bogorny, ML Damiani, A Gkoulalas-Divanis, JA Macedo, N Pelekis, others
ACM Computing Surveys (to appear), 2013

Utility-Aware Anonymization of Diagnosis Codes
G. Loukides, A. Gkoulalas-Divanis
IEEE Transactions on Biomedical Informatics (TITB), IEEE, 2013

Efficient and flexible anonymization of transaction data
G. Loukides, A. Gkoulalas-Divanis, J. Shao
Knowledge and Information Systems, 1--58, Springer, 2013


2012

Assessing Disclosure Risk and Data Utility Trade-off in Transaction Data Anonymization.
Grigorios Loukides, Aris Gkoulalas-Divanis, Jianhua Shao
Int. J. Software and Informatics 6(3), 399--417, 2012

Anonymization of Electronic Medical Records to Support Clinical Analysis
A. Gkoulalas-Divanis, G. Loukides
Divanis, G Loukides - 2012 - books.google.com, Springer-Verlag New York Incorporated

A Framework for Mobility Pattern Mining and Privacy-Aware Querying of Trajectory Data
D. Kopanaki, N. Pelekis, A. Gkoulalas-Divanis, M. Vodas, Y. Theodoridis
Divanis, M Vodas... - 2012 - uhasselt.be

QuerioCity: A Linked Data Platform for Urban Information Management
Vanessa L\'{o}pez, Spyros Kotoulas, Marco Luca Sbodio, Martin Stephenson, Aris Gkoulalas-Divanis, Pol Mac Aonghusa
The Semantic Web - ISWC 2012 - 11th International Semantic Web Conference, Boston, MA, USA, November 11-15, 2012, Proceedings, Part II, pp. 148--163

EWNI: Efficient Anonymization of Vulnerable Individuals in Social Networks
F. Nagle, L. Singh, A. Gkoulalas-Divanis
Advances in Knowledge Discovery and Data Mining, 359--370, Springer, 2012

Queriocity: Accessing the Information of a City
Vanessa Lopez, Spyros Kotoulas, Marco Luca Sbodio, Martin Stephenson, Raymond Lloyd, Aris Gkoulalas-Divanis, Pol Mac Aonghusa
AAAI, 2012

Utility-guided Clustering-based Transaction Data Anonymization
A. Gkoulalas-Divanis, G. Loukides
Transactions on Data Privacy5, 2012

Privacy-Preserving Medical Data Sharing
A. Gkoulalas-Divanis, G. Loukides
SDM Tutorial, 2012

Private-HERMES: A Benchmark Framework for Privacy-Preserving Mobility Data Querying and Mining Methods
N Pelekis, A Plemenos, A Gkoulalas-Divanis, D Kopanaki, M Vodas, Y Theodoridis
Divanis... - 2012 - edbt.org

Utility-preserving transaction data anonymization with low information loss
G Loukides, A Gkoulalas-Divanis
Expert Systems with Applications, Elsevier, 2012

Assessing Disclosure Risk and Data Utility Trade-off in Transaction Data Anonymization
G. Loukides, A. Gkoulalas-Divanis, J. Shao
International Journal of Software Informatics, Special Issue 6(3), 399-417, 2012


2011

Preface for the Special Issue on Privacy-Aspects of Data Mining
Aris Gkoulalas-Divanis, Kun Liu, Vassilios S Verykios, Ran Wolff
Journal of Computing Science and Engineering 5(3), 167--168, 2011

A privacy-aware query engine for sensitive trajectory data
N Pelekis, A Gkoulalas-Divanis, M Vodas, D Kopanakis, Y Theodoridis
Proceedings of the 20 th ACM Conference on Information and Knowledge Management (CIKM'11), 2011

Privacy and Security Issues in Data Mining and Machine Learning
Christos Dimitrakakis Aris Gkoulalas-Divanis, Aikaterini Mitrokotsa Vassilios S Verykios, Y\"ucel Saygin
Divanis, AMVS Verykios, Y Saygin - 2011 - Springer, Springer

Privacy Challenges and Solutions for Medical Data Sharing
Aris Gkoulalas-Divanis, G LOUKIDES
ECML PKDD, 2011

Privacy in mobility data mining.
Aris Gkoulalas-Divanis, Y\"ucel Saygin, Dino Pedreschi
SIGKDD Explorations 13(1), 4--5, 2011

Privacy and Security in Data Mining and Machine Learning
A. Gkoulalas-Divanis, V.S. Verykios, Y. Saygin
Transactions on Data Privacy, Special Issue 4(3), 2011

Privacy and Security Issues in Data Mining and Machine Learning: International ECML/PKDD Workshop, PSDML 2010, Barcelona, Spain, September 24, 2010. Revised Selected Papers
C. Dimitrakakis, A. Gkoulalas-Divanis, A. Mitrokotsa, V.S. Verykios, Y. Saygin
Divanis, A Mitrokotsa... - 2011 - books.google.com, Springer

Medical Data Sharing: Privacy Challenges and Solutions
A Gkoulalas-Divanis, G Loukides
ECML/PKDD Tutorial, 2011

Privacy in mobility data mining
A Gkoulalas-Divanis, Y Saygin, D Pedreschi
ACM SIGKDD Explorations Newsletter 13(1), 4--5, ACM, 2011

Privacy-aware querying over sensitive trajectory data
N Pelekis, A Gkoulalas-Divanis, M Vodas, D Kopanaki, Y Theodoridis
Proceedings of the 20th ACM international conference on Information and knowledge management, pp. 895--904, 2011

Revisiting sequential pattern hiding to enhance utility
A Gkoulalas-Divanis, G Loukides
Proceedings of the 17th ACM SIGKDD international conference on Knowledge discovery and data mining, pp. 1316--1324, 2011

A publication process model to enable privacy-aware data sharing
A Gkoulalas-Divanis, E W Cope
IBM Journal of Research and Development (Special Issue for the 100th Anniversary of IBM) 55(5), 8:1-8:10, IEEE, 2011

On balancing disclosure risk and data utility in transaction data sharing using RU confidentiality map
G Loukides, A Gkoulalas-Divanis, J Shao
Joint UNECE/Eurostat work session on statistical data confidentiality, 2011

PCTA: Privacy-constrained Clustering-based Transaction Data Anonymization
A. Gkoulalas-Divanis, G. Loukides
4th International Workshop on Privacy and Anonymity in the Information Society, pp. 5, ACM, 2011

COAT: COnstraint-based Anonymization of Transactions
G Loukides, A Gkoulalas-Divanis, B Malin
Knowledge and Information Systems: Special Issue on Context-Aware Data Mining 28(2), 251--282, Springer, 2011


2010

Distortion Schemes
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 29--33, Springer, 2010

Inline Algorithm
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 71--82, Springer, 2010

Proceedings of the 1st International ECML/PKDD Workshop on Privacy and Security Issues in Data Mining and Machine Learning (PSDML 2010)
Christos Dimitrakakis, Aris Gkoulalas-Divanis, Aikaterini Mitrokotsa, Vassilios S Verykios, Y\"ucel Saygin
Divanis, A Mitrokotsa... - 2010 - publications.lib.chalmers.se, Springer-Verlag

2nd IEEE International Workshop on Privacy Aspects of Data Mining (PADM 2010)
Aris Gkoulalas--Divanis, Kun Liu, Vassilios S Verykios, Ran Wolff
IEEE ICDM 2010

Two-Phase Iterative Algorithm
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 83--92, Springer, 2010

Association Rule Hiding for Data Mining. Advances in Database Systems
Aris Gkoulalas-Divanis, V Verykios
Divanis, V Verykios - 2010 - veguju.2kool4u.net, Springer US

Border Revision for Knowledge Hiding
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 41--46, Springer, 2010

Parallelization Framework for Exact Hiding
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 119--130, Springer, 2010

Max-Min Algorithms
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 53--58, Springer, 2010

Quantifying the Privacy of Exact Hiding Algorithms
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 131--134, Springer, 2010

Classes of Association Rule Hiding Methodologies
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 17--20, Springer, 2010

An integrative framework for anonymizing clinical and genomic data
Grigorios Loukides, Aris Gkoulalas-Divanis, Bradley Malin
Database technology for life sciences and medicine, pp. 65--89, World Scientific, 2010

Blocking Schemes
Aris Gkoulalas-Divanis, Vassilios S Verykios
Association Rule Hiding for Data Mining, pp. 35--36, Springer, 2010

Privacy Preservation in Trajectories of Moving Objects
V.S. Verykios, A. Gkoulalas-Divanis, Y. Theodoridis, N. Pelekis
Privacy Preservation on Computer and Communication Technologies: Technical and Legal Issues, Papasotiriou, 2010

Privacy Issues in Spatiotemporal Data Mining
A. Gkoulalas-Divanis, V.S. Verykios
Privacy-Aware Knowledge Discovery: Novel Applications and New Techniques, Chapman & Hall / CRC Press, 2010

An Integrative, Anonymity-Preserving Framework for Disseminating Patient Records
G. Loukides, A. Gkoulalas-Divanis, B. Malin
Database Technology for Life Sciences and Medicine, World Scientific Publishing, 2010

Privacy-Preserving Publication of Diagnosis Codes for Effective Biomedical Analysis
G Loukides, A Gkoulalas-Divanis, B Malin
10th IEEE International Conference on Information Technology and Applications in Biomedicine, pp. 1--6, 2010

Anonymizing Transaction Data to Eliminate Sensitive Inferences
G Loukides, A Gkoulalas-Divanis, J Shao
21st International Conference on Database and Expert Systems Applications, pp. 400--415, Springer, 2010

From Itemsets Through Trajectories to Location Based Services: A Knowledge Hiding Privacy Approach
A Gkoulalas-Divanis
SIGKDD Explorations 11(2), 61--62, ACM, 2010

Association Rule Hiding for Data Mining
A Gkoulalas-Divanis, V S Verykios
Divanis... - 2010 - books.google.com, Springer

Providing K-Anonymity in Location Based Services
A Gkoulalas-Divanis, P Kalnis, and V S Verykios
ACM SIGKDD Explorations 12(1), 3--10, ACM, 2010

Anonymization of Electronic Medical Records for Validating Genome-Wide Association Studies
G Loukides, A Gkoulalas-Divanis, B Malin
Proceedings of the National Academy of Sciences 107(17), 7898, National Acad Sciences, 2010


2009

Identifying Unsafe Routes for Network-Based Trajectory Privacy.
Aris Gkoulalas-Divanis, Vassilios S Verykios, Mohamed F Mokbel
SDM, pp. 942--953, 2009

HESTIA: Historically-Enabled Spatiotemporal Information Anonymity
A. Gkoulalas-Divanis, V.S. Verykios
Data Mining and Management, Nova Science Publishers, 2009

Reconstruction-based Classification Rule Hiding through Controlled Data Modification
A Katsarou, A Gkoulalas-Divanis, V S Verykios
Artificial Intelligence Applications and Innovations, pp. 449, Springer, 2009

Towards Utility-Driven Anonymization of Transactions
G Loukides, A Gkoulalas-Divanis, B Malin
Arxiv preprint arXiv:0912.2548, 2009

Privacy Preserving Data Mining: How far can we go?
A Gkoulalas-Divanis, V S Verykios
Handbook of Research on Data Mining in Public and Private Sectors: Organizational and Government Applications, pp. 125, IGI Global, 2009

PLOT: Privacy in Location Based Services: An Open-Ended Toolbox
A Gkoulalas-Divanis, V S Verykios, D Eleftheriou
Mobile Data Management: Systems, Services and Middleware, 2009, pp. 62--71

Exact Knowledge Hiding in Transactional Databases
A Gkoulalas-Divanis, V S Verykios
International Journal on Artificial Intelligence Tools 18(1), 17--37, 2009

Concealing the Position of Individuals in Location-Based Services
A Gkoulalas-Divanis, V S Verykios
Operational Research 11(2), 1--14, Springer, 2009

An Overview of Privacy Preserving Data Mining
A Gkoulalas-Divanis, V S Verykios
Crossroads 15(4), 23--26, ACM, 2009

Privacy Challenges and Solutions in the Social Web
G Loukides, A Gkoulalas-Divanis
Crossroads 16(2), 14--18, ACM, 2009
Abstract

A Network Aware Privacy Model for Online Requests in Trajectory Data
A Gkoulalas-Divanis, V S Verykios, P Bozanis
Data & Knowledge Engineering 68(4), 431--452, Elsevier, 2009

Hiding Sensitive Knowledge without Side Effects
A Gkoulalas-Divanis, V S Verykios
Knowledge and Information Systems 20(3), 263--299, Springer, 2009

Identifying Unsafe Routes for Network-Based Trajectory Privacy
A Gkoulalas-Divanis, V S Verykios, M F Mokbel
SIAM Data Mining, 2009

Offering Increased Privacy Guarantees in Continuous Location Based Services
D. Douras, A. Gkoulalas-Divanis, V. S. Verykios
4th Balkan Conference on Informatics (BCI), 2009

Exact Knowledge Hiding through Database Extension
A Gkoulalas-Divanis, V S Verykios
IEEE Transactions on Knowledge and Data Engineering 21(5), 699--713, IEEE, 2009


2008

Selim. V. Kaya, and Erkay Savas. Privacy in Spatiotemporal Data Mining
Francesco Bonchi, Y\"ucel Saygin, Vassilios S Verykios, Maurizio Atzori, Aris Gkoulalas-Divanis
Divanis - 2008 - Springer Verlang, Springer Verlang

Protecting Individuals in Location Based Services
A. Gkoulalas-Divanis, V.S. Verykios
20th Conference on Corporation Research, pp. 973-984, 2008

A free terrain model for trajectory K--anonymity
Aris Gkoulalas-Divanis, Vassilios S Verykios
Database and Expert Systems Applications, pp. 49--56, 2008

Privacy in Trajectory Data
A Gkoulalas-Divanis, V S Verykios
Social Implications of Data Mining and Information Privacy: Interdisciplinary Frameworks and Solutions, pp. 199--212, Information Science Reference, 2008

A Parallelization Framework for Exact Knowledge Hiding in Transactional Databases
A Gkoulalas-Divanis, V S Verykios
23rd International Information Security Conference, pp. 349--363, 2008

A Privacy-Aware Trajectory Tracking Query Engine
A Gkoulalas-Divanis, V S Verykios
ACM SIGKDD Explorations 10(1), 40--49, ACM, 2008

Privacy and Security in Spatiotemporal Data and Trajectories
V S Verykios, M L Damiani, A Gkoulalas-Divanis
Mobility, Data Mining and Privacy, pp. 213--240, Springer, 2008

Privacy in Spatiotemporal Data Mining
F Bonchi, Y Saygin, VS Verykios, M Atzori, A Gkoulalas-Divanis, SV Kaya, E Savas
Mobility, Data Mining and Privacy, pp. 297--333, Springer, 2008

A Survey of Association Rule Hiding Methods for Privacy
VS Verykios, A Gkoulalas-Divanis
Privacy Preserving Data Mining: Models and Algorithms. Springer, 267--289, Springer, 2008


2007

A k-anonymity model for spatio-temporal data
Polixeni Zacharouli, Aris Gkoulalas-Divanis, Vassilios S Verykios
Data Engineering Workshop, 2007 IEEE 23rd International Conference on, pp. 555--564

A Hybrid Approach to Frequent Itemset Hiding
A Gkoulalas-Divanis, V S Verykios
19th IEEE International Conference on Tools with Artificial Intelligence, pp. 297--304, 2007


2006

An Integer Programming Approach for Frequent Itemset Hiding
A Gkoulalas-Divanis, V S Verykios
Proceedings of the 15th ACM international conference on Information and knowledge management, pp. 748--757, 2006