Panagiotis Karras

Department of Computer Science
University of Copenhagen
Sigurdsgade 41
Copenhagen, Denmark 2200
piekarras at gmail com


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.
See relevant publications below. If you are interested, send me a CV and a letter describing your motivation and interests.



Refereed Conference and Journal Articles

  1. Spectral Subgraph Localization
    Ama Bembua Bainson, Amit Boyarski, Judith Hermanns, Petros Petsinis, Niklas Aavad, Casper Dam Larsen, Tiarnan Swayne, Davide Mottin, Alexander M. Bronstein, and Panagiotis Karras
    Proc. of the 2nd Learning on Graphs Conference (LoG), Virtual Event, November 2023

  2. k-Best Egalitarian Stable Marriages for Task Assignment
    Siyuan Wu, Leong Hou U, and Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 16(11), 2023 (49th VLDB Conf., Vancouver, Canada, August 2023)

  3. Adaptive Indexing in High-Dimensional Metric Spaces
    Konstantinos Lampropoulos, Fatemeh Zardbani, Nikos Mamoulis, and Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 16(10), 2023 (49th VLDB Conf., Vancouver, Canada, August 2023)

  4. Adaptive Indexing of Objects with Spatial Extent
    Fatemeh Zardbani, Nikos Mamoulis, Stratos Idreos, and Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 16(9), 2023 (49th VLDB Conf., Vancouver, Canada, August 2023)

  5. Marigold: Efficient k-means Clustering in High Dimensions
    Kasper Overgaard Mortensen, Fatemeh Zardbani, Mohammad Ahsanul Haque, Steinn Ymir Agustsson, Davide Mottin, Philip Hofmann, and Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 16(7), 2023 (49th VLDB Conf., Vancouver, Canada, August 2023)

  6. SIFTER: Space-Efficient Value Iteration for Finite-Horizon MDPs
    Konstantinos Skitsas, Ioannis Papageorgiou, Sadegh Talebi, Verena Kantere, Michael Katehakis, and Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 16(1), 2022 (49th VLDB Conf., Vancouver, Canada, August 2023)

  7. Holistic Prediction on a Time-Evolving Attributed Graph
    Shohei Yamasaki, Yuya Sasaki, Panagiotis Karras, and Makoto Onizuka
    Proc. of the 61st Annual Meeting of the Association for Computational Linguistics (ACL), Toronto, Canada, July 2023

  8. Atrapos: Real-time Evaluation of Metapath Qery Workloads
    Serafeim Chatzopoulos, Thanasis Vergoulis, Dimitrios Skoutas, Theodore Dalamagas, Christos Tryfonopoulos, and Panagiotis Karras
    Proc. of the 32nd ACM Web Conference (WWW), Austin, Texas, May 2023

  9. GRASP: Scalable Graph Alignment by Spectral Corresponding Functions
    Judith Hermanns, Konstantinos Skitsas, Anton Tsitsulin, Marina Munkhoeva, Alexander Kyster, Simon Nielsen, Alexander M. Bronstein, Davide Mottin, and Panagiotis Karras
    ACM Transactions on Knowledge Discovery from Data (TKDD), 17(4), May 2023

  10. Comprehensive Evaluation of Algorithms for Unrestricted Graph Alignment
    Konstantinos Skitsas, Karol Orlowski, Judith Hermanns, Davide Mottin, and Panagiotis Karras
    Proc. of the 26th Intl Conf. on Extending Database Technology (EDBT), Ioannina, Greece, March 2023

  11. Maximizing the Probability of Fixation in the Positional Voter Model
    Petros Petsinis, Andreas Pavlogiannis, and Panagiotis Karras
    Proc. of the 37th AAAI Conf. on Artificial Intelligence (AAAI), Washington, DC, USA, February 2023

  12. On the Robustness of Diffusion in a Network Under Node Attacks
    Alvis Logins, Yuchen Li, and Panagiotis Karras
    IEEE Transactions on Knowledge and Data Engineering (TKDE), 34(12), December 2022

  13. One-off Disclosure Control by Heterogeneous Generalization
    Olga Gkountouna, Katerina Doka, Mingqiang Xue, Jianneng Cao, and Panagiotis Karras
    Proc. of the 31st USENIX Security Symposium, Boston, MA, August 2022

  14. Invasion Dynamics in the Biased Voter Process
    Loke Durocher, Panagiotis Karras, Andreas Pavlogiannis, and Josef Tkadlec
    Proc. of the 31st Intl Joint Conf. on Artificial Intelligence (IJCAI), Vienna, Austria, July 2022

  15. A Content Recommendation Policy for Gaining Subscribers
    Konstantinos Theocharidis, Manolis Terrovitis, Spiros Skiadopoulos, and Panagiotis Karras
    Proc. of the 45th ACM SIGIR Intl Conf. on Research and Development in Information Retrieval (SIGIR), Madrid, Spain, July 2022

  16. SIEVE: A Space-Efficient Algorithm for Viterbi Decoding
    Martino Ciaperoni, Aristides Gionis, Athanasios Katsamanis, and Panagiotis Karras
    Proc. of the 2022 ACM SIGMOD Intl Conf. on Management of Data (SIGMOD), Philadelphia, PA, June 2022

  17. Fixation Maximization in the Positional Moran Process
    Joachim Brendborg, Panagiotis Karras, Andreas Pavlogiannis, Asger Ullersted Rasmussen, and Josef Tkadlec
    Proc. of the 36th AAAI Conf. on Artificial Intelligence (AAAI), Virtual Event, February 2022

  18. Sparse Shield: Social Network Immunization vs. Harmful Speech
    Alexandru Petrescu, Ciprian-Octavian Truica, Elena Simona Apostol, and Panagiotis Karras
    Proc. of the 30th ACM Conf. on Information and Knowledge Management (CIKM), Virtual Event, Queensland, Australia, November 2021

  19. Centerpoint Query Authentication
    Magnus Haxen, Morten Raeburn, Peyman Afshani, and Panagiotis Karras
    Proc. of the 30th ACM Conf. on Information and Knowledge Management (CIKM), Virtual Event, Queensland, Australia, November 2021

  20. Boosting Graph Alignment Algorithms
    Alexander Frederiksen Kyster, Simon Daugaard Nielsen, Judith Hermanns, Davide Mottin, and Panagiotis Karras
    Proc. of the 30th ACM Conf. on Information and Knowledge Management (CIKM), Virtual Event, Queensland, Australia, November 2021

  21. GRASP: Graph Alignment Through Spectral Signatures
    Judith Hermanns, Anton Tsitsulin, Marina Munkhoeva, Alexander M. Bronstein, Davide Mottin, and Panagiotis Karras
    Proc. of the 5th Intl Conf. on Web and Big Data (APWeb-WAIM), Guangzhou, China, August 2021

  22. Finding Geo-Social Cohorts in Location-Based Social Networks
    Muhammad Aamir Saleem, Toon Calders, Torben Bach Pedersen, and Panagiotis Karras
    Proc. of the 5th Intl Conf. on Web and Big Data (APWeb-WAIM), Guangzhou, China, August 2021

  23. FREDE: Anytime Graph Embeddings
    Anton Tsitsulin, Marina Munkhoeva, Davide Mottin, Panagiotis Karras, Ivan Oseledets, and Emmanuel Müller
    Proc. of the VLDB Endowment (PVLDB), 14(6), 2021 (47th VLDB Conf., Copenhagen, August 2021)

  24. Context-aware Outstanding Fact Mining from Knowledge Graphs
    Yueji Yang, Yuchen Li, Panagiotis Karras, and Anthony K. H. Tung
    Proc. of the 27th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining (KDD), Virtual Event, Singapore, August 2021

  25. A Deep Learning Architecture for Audience Interest Prediction of News Topic on Social Media
    Ciprian-Octavian Truica, Elena Simona Apostol, Teodor Stefu, and Panagiotis Karras
    Proc. of the 24th Intl Conf. on Extending Database Technology (EDBT), Virtual Event, Cyprus, March 2021

  26. Revisiting Multidimensional Adaptive Indexing
    Anders Hammershøj Jensen, Frederik Aarup Lauridsen, Fatemeh Zardbani, Stratos Idreos, and Panagiotis Karras
    Proc. of the 24th Intl Conf. on Extending Database Technology (EDBT), Virtual Event, Cyprus, March 2021

  27. Indoor Quality-of-position Visual Assessment Using Crowdsourced Fingerprint Maps
    Christos Laoudias, Artyom Nikitin, Panagiotis Karras, Moustafa Youssef, and Demetrios Zeinalipour-Yazti
    ACM Transactions on Spatial Algorithms and Systems (TSAS), 7(2), February 2021

  28. Selecting Influential Features by a Learnable Content-Aware Linear Threshold Model
    Ansh Khurana, Alvis Logins, and Panagiotis Karras
    Proc. of the 29th ACM Conf. on Information and Knowledge Management (CIKM), Virtual Event, Ireland, October 2020

  29. Geodemographic Influence Maximization
    Kaichen Zhang, Jingbo Zhou, Donglai Tao, Panagiotis Karras, Qing Li, and Hui Xiong
    Proc. of the 26th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining (KDD), Virtual Event, August 2020

  30. The Shape of Data: Intrinsic Distance for Data Distributions
    Anton Tsitsulin, Marina Munkhoeva, Davide Mottin, Panagiotis Karras, Alexander M. Bronstein, Ivan Oseledets, and Emmanuel Müller
    Proc. of the 8th Intl Conf. on Learning Representations (ICLR), Addis Ababa, Ethiopia, April 2020

  31. On the Robustness of Cascade Diffusion under Node Attacks
    Alvis Logins, Yuchen Li, and Panagiotis Karras
    Proc. of the 29th Intl World Wide Web Conf. (WWW), Taipei, April 2020

  32. Revisiting the Theory and Practice of Database Cracking
    Fatemeh Zardbani, Peyman Afshani, and Panagiotis Karras
    Proc. of the 23rd Intl Conf. on Extending Database Technology (EDBT), Copenhagen, Denmark, March 2020

  33. Fair Procedures for Fair Stable Marriage Outcomes
    Nikolaos Tziavelis, Ioannis Giannakopoulos, Rune Quist Johansen, Katerina Doka, Nectarios Koziris, and Panagiotis Karras
    Proc. of the 34th AAAI Conf. on Artificial Intelligence (AAAI), New York, February 2020

  34. Equitable Stable Matchings in Quadratic Time
    Nikolaos Tziavelis, Ioannis Giannakopoulos, Katerina Doka, Nectarios Koziris, and Panagiotis Karras
    Proc. of the 33rd Conf. on Neural Information Processing Systems (NeurIPS), Vancouver, Canada, December 2019

  35. Figuring out the User in a Few Steps: Bayesian Multifidelity Active Search with Cokriging
    Nikita Klyuchnikov, Davide Mottin, Georgia Koutrika, Emmanuel Müller, and Panagiotis Karras
    Proc. of the 25th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining (KDD), Anchorage, Alaska, August 2019

  36. Maximizing Multifaceted Network Influence
    Yuchen Li, Ju Fan, George V. Ovchinnikov, and Panagiotis Karras
    Proc. of the 35th IEEE Intl Conf. on Data Engineering (ICDE), Macau, China, April 2019

  37. Multicapacity Facility Selection in Networks
    Alvis Logins, Panagiotis Karras, and Christian S. Jensen
    Proc. of the 35th IEEE Intl Conf. on Data Engineering (ICDE), Macau, China, April 2019

  38. An Experimental Study of Network Immunization
    Alvis Logins and Panagiotis Karras
    Proc. of the 22nd Intl Conf. on Extending Database Technology (EDBT), Lisbon, Portugal, March 2019

  39. NetLSD: Hearing the Shape of a Graph
    Anton Tsitsulin, Davide Mottin, Panagiotis Karras, Alexander M. Bronstein, and Emmanuel Müller
    Proc. of the 24th ACM SIGKDD Intl Conf. on Knowledge Discovery & Data Mining (KDD), London, United Kingdom, August 2018

  40. VERSE: Versatile Graph Embeddings from Similarity Measures
    Anton Tsitsulin, Davide Mottin, Panagiotis Karras, and Emmanuel Müller
    Proc. of the 27th Intl World Wide Web Conf. (WWW), Lyon, France, April 2018

  41. Content Recommendation for Viral Social Influence
    Sergei Ivanov, Konstantinos Theocharidis, Manolis Terrovitis, and Panagiotis Karras
    Proc. of the 40th ACM SIGIR Intl Conf. on Research and Development in Information Retrieval (SIGIR), Tokyo, Japan, August 2017

  42. Indoor Localization Accuracy Estimation from Fingerprint Data
    Artyom Nikitin, Christos Laoudias, Georgios Chatzimilioudis, Panagiotis Karras, and Demetrios Zeinalipour-Yazti
    Proc. of the 18th IEEE Intl Conf. on Mobile Data Management (MDM), Daejeon, South Korea, May 2017

  43. Harvester: Influence Optimization in Symmetric Interaction Networks
    Sergei Ivanov and Panagiotis Karras
    Proc. of the 3rd IEEE Intl Conf. on Data Science and Advanced Analytics (DSAA), Montreal, Canada, October 2016

  44. Adaptive Indexing over Encrypted Numeric Data
    Panagiotis Karras, Artyom Nikitin, Muhammad Saad, Rudrika Bhatt, Denis Antyukhov, Stratos Idreos
    Proc. of the 2016 ACM SIGMOD Intl Conf. on Management of Data (SIGMOD), San Francisco, California, June 2016

  45. TRANSFORMERS: Robust spatial joins on non-uniform data distributions
    Mirjana Pavlovic, Thomas Heinis, Farhan Tauheed, Panagiotis Karras, and Anastasia Ailamaki
    Proc. of the 32nd IEEE Intl Conf. on Data Engineering (ICDE), Helsinki, Finland, May 2016

  46. Fuzzy trajectory linking
    Huayu Wu, Mingqiang Xue, Jianneng Cao, Panagiotis Karras, Wee Siong Ng, and Kee Kiat Koo
    Proc. of the 32nd IEEE Intl Conf. on Data Engineering (ICDE), Helsinki, Finland, May 2016

  47. Collaborative Search Log Sanitization: Toward Differential Privacy and Boosted Utility
    Yuan Hong, Jaideep Vaidya, Haibing Lu, Panagiotis Karras, and Sanjay Goel
    IEEE Transactions on Dependable and Secure Computing (TDSC), 12(5), 2015

  48. k-Anonymization by Freeform Generalization
    Katerina Doka, Mingqiang Xue, Dimitrios Tsoumakos, and Panagiotis Karras
    Proc. of the 10th ACM Symposium on Information, Computer and Communications Security (AsiaCCS), Singapore, April 2015

  49. An Equitable Solution to the Stable Marriage Problem
    Ioannis Giannakopoulos, Panagiotis Karras, Dimitrios Tsoumakos, Katerina Doka, Nectarios Koziris
    Proc. of the 27th IEEE Intl Conf. on Tools with Artificial Intelligence (ICTAI), Vietri sul Mare, Italy, November 2015

  50. Graph-Aware, Workload-Adaptive SPARQL Query Caching
    Nikolaos Papailiou, Dimitrios Tsoumakos, Panagiotis Karras, and Nectarios Koziris
    Proc. of the 2015 ACM SIGMOD Intl Conf. on Management of Data (SIGMOD), Melbourne, Australia, June 2015

  51. L-opacity: Linkage-Aware Graph Anonymization
    Sadegh Nobari, Panagiotis Karras, HweeHwa Pang, and Stéphane Bressan
    Proc. of the 17th Intl Conf. on Extending Database Technology (EDBT), Athens, Greece, March 2014

  52. On the Privacy and Utility of Anonymized Social Networks
    Yi Song, Xuesong Lu, Sadegh Nobari, Stéphane Bressan, and Panagiotis Karras
    International Journal of Adaptive, Resilient and Autonomic Systems (IJARAS), 4(2), 2013

  53. An effective and efficient parallel approach for random graphs generation over GPUs
    Stéphane Bressan, Alfredo Cuzzocrea, Panagiotis Karras, Xuesong Lu, and Sadegh Nobari
    Journal of Parallel and Distributed Computing (JPDC), 73(3), March 2013

  54. H2RDF+: High-performance Distributed Joins over Large-scale RDF Graphs
    Nikolas Papailiou, Ioannis Konstantinou, Dimitrios Tsoumakos, Panagiotis Karras, and Nectarios Koziris
    Proc. of the 2013 IEEE Intl Conf. on Big Data (IEEE BigData), Santa Clara, California, October 2013

  55. eSkyline: Processing Skyline Queries over Encrypted Data
    Suvarna Bothe, Panagiotis Karras, and Akrivi Vlachou
    Proc. of the 39th Intl Conf. on Very Large Data Bases (VLDB), Riva del Garda, Italy, August 2013

  56. TOUCH: In-Memory Spatial Join by Hierarchical Data-Oriented Partitioning
    Sadegh Nobari, Farhan Tauheed, Thomas Heinis, Panagiotis Karras, Stéphane Bressan, and Anastasia Ailamaki
    Proc. of the 2013 ACM SIGMOD Intl Conf. on Management of Data (SIGMOD), New York, NY, June 2013

  57. Publishing Microdata with a Robust Privacy Guarantee
    Jianneng Cao and Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 5(11), July 2012 (38th VLDB Conf., Istanbul, August 2012)

  58. Stochastic Database Cracking: Towards Robust Adaptive Indexing in Main-Memory Column-Stores
    Felix Halim, Stratos Idreos, Panagiotis Karras, and Roland H. C. Yap
    Proc. of the VLDB Endowment (PVLDB), 5(6), February 2012 (38th VLDB Conf., Istanbul, August 2012)

  59. Delineating Social Network Data Anonymization via Random Edge Perturbation
    Mingqiang Xue, Chedy Raïssi, Panagiotis Karras, Panos Kalnis, and Hung Keng Pung
    Proc. of the 21st ACM Conf. on Information and Knowledge Management (CIKM), Maui, Hawaii, October 2012

  60. Discretionary Social Network Data Revelation with a User-Centric Utility Guarante
    Song Yi, Panagiotis Karras, Sadegh Nobari, Giorgos Cheliotis, Mingqiang Xue, and Stéphane Bressan
    Proc. of the 21st ACM Conf. on Information and Knowledge Management (CIKM), Maui, Hawaii, October 2012

  61. Anonymizing Set-Valued Data by Nonreciprocal Recoding
    Mingqiang Xue, Panagiotis Karras, Chedy Raïssi, Jaideep Vaidya, and Kian-Lee Tan
    Proc. of the 18th ACM SIGKDD Intl Conf. on Knowledge Discovery and Data Mining (KDD), Beijing, China, August 2012

  62. Cooperative Scalable Moving Continuous Query Processing
    Xiaohui Li, Panagiotis Karras, Lei Shi, Kian-Lee Tan, and Christian S. Jensen
    Proc. of the 13th IEEE Intl Conf. on Mobile Data Management (MDM), Bengaluru, India, July 2012

  63. Sensitive Label Privacy Protection on Social Network Data
    Yi Song, Panagiotis Karras, Qian Xiao, and Stéphane Bressan
    Proc. of the 24th Intl Conf. on Scientific and Statistical Database Management (SSDBM), Chania, Crete, Greece, June 2012

  64. Scalable Parallel Minimum Spanning Forest Computation
    Sadegh Nobari, Thanh-Tung Cao, Panagiotis Karras, and Stéphane Bressan
    Proc. of the 17th ACM SIGPLAN Symp. on Principles and Practice of Parallel Programming (PPoPP), New Orleans, Louisiana, February 2012

  65. Authenticated Multi-Step Nearest Neighbor Search
    Stavros Papadopoulos, Lixing Wang, Yin Yang, Dimitris Papadias, and Panagiotis Karras
    IEEE Transactions on Knowledge and Data Engineering (TKDE), 23(5), May 2011

  66. SABRE: A Sensitive Attribute Bucketization and REdistribution framework for t-closeness
    Jianneng Cao, Panagiotis Karras, Panos Kalnis, and Kian-Lee Tan
    The VLDB Journal (VLDBJ), 20(1), February 2011

  67. Utility-Driven Anonymization in Data Publishing
    Mingqiang Xue, Panagiotis Karras, Chedy Raïssi, and Hung Keng Pung
    Proc. of the 20th ACM Conf. on Information and Knowledge Management (CIKM), Glasgow, United Kingdom, October 2011

  68. Scalable kNN Search on Vertically Stored Time Series
    Shrikant Kashyap and Panagiotis Karras
    Proc. of the 17th ACM SIGKDD Intl Conf. on Knowledge Discovery and Data Mining (KDD), San Diego, California, August 2011

  69. Fast Random Graph Generation
    Sadegh Nobari, Xuesong Lu, Panagiotis Karras, and Stéphane Bressan
    Proc. of the 14th Intl Conf. on Extending Database Technology (EDBT), Uppsala, Sweden, March 2011

  70. ρ-uncertainty: Inference-Proof Transaction Anonymization
    Jianneng Cao, Panagiotis Karras, Chedy Raïssi, and Kian-Lee Tan
    Proc. of the VLDB Endowment (PVLDB), 3(1) (36th VLDB Conf., Singapore, September 2010)

  71. CW2I: Community Data Indexing for Complex Query Processing
    Mei Hui, Panagiotis Karras, and Beng Chin Ooi
    Proc. of the 11th Intl Conf. on Web-Age Information Management (WAIM), Jiuzhaigou, China, July 2010

  72. Local Search in Histogram Construction
    Felix Halim, Panagiotis Karras, and Roland H. C. Yap
    Proc. of the 24th AAAI Conf. on Artificial Intelligence (AAAI), Atlanta, Georgia, July 2010

  73. Optimality and Scalability in Lattice Histogram Construction
    Panagiotis Karras
    Proc. of the VLDB Endowment (PVLDB), 2(1) (35th VLDB Conf., Lyon, France, August 2009)

  74. A Framework for Efficient Data Anonymization under Privacy and Accuracy Constraints
    Gabriel Ghinita, Panagiotis Karras, Panos Kalnis, and Nikos Mamoulis
    ACM Transactions on Data Base Systems (TODS), 34(2), June 2009

  75. Fast and Effective Histogram Construction
    Felix Halim, Panagiotis Karras, and Roland H. C. Yap
    Proc. of the 18th ACM Conf. on Information and Knowledge Management (CIKM), Hong Kong, China, November 2009

  76. Multiplicative Synopses for Relative-Error Metrics
    Panagiotis Karras
    Proc. of the 12th Intl Conf. on Extending Database Technology (EDBT), Saint-Petersburg, Russia, March 2009

  77. Hexastore: Sextuple Indexing for Semantic Web Data Management
    Cathrin Weiss, Panagiotis Karras, and Abraham Bernstein
    Proc. of the VLDB Endowment (PVLDB), 1(1) (34th VLDB Conf., Auckland, New Zealand, August 2008)

  78. Hierarchical Synopses with Optimal Error Guarantees [appendix]
    Panagiotis Karras and Nikos Mamoulis
    ACM Transactions on Data Base Systems (TODS), 33(3), August 2008

  79. Lattice Histograms: a Resilient Synopsis Structure
    Panagiotis Karras and Nikos Mamoulis
    Proc. of the 24th IEEE Intl Conf. on Data Engineering (ICDE), Cancún, Mexico, April 2008

  80. Common Influence Join: A Natural Join Operation for Spatial Pointsets
    Man Lung Yiu, Nikos Mamoulis, and Panagiotis Karras
    Proc. of the 24th IEEE Intl Conf. on Data Engineering (ICDE), Cancún, Mexico, April 2008

  81. Ring-constrained Join: Deriving Fair Middleman Locations from Pointsets via a Geometric Constraint
    Man Lung Yiu, Panagiotis Karras, and Nikos Mamoulis
    Proc. of the 11th Intl Conf. on Extending Database Technology (EDBT), Nantes, France, March 2008

  82. Fast Anonymization with Low Information Loss
    Gabriel Ghinita, Panagiotis Karras, Panos Kalnis, and Nikos Mamoulis
    Proc. of the 33rd Intl Conf. on Very Large Data Bases (VLDB), Vienna, September 2007

  83. Exploiting Duality in Summarization with Deterministic Guarantees
    Panagiotis Karras, Dimitris Sacharidis, and Nikos Mamoulis
    Proc. of the 13th ACM SIGKDD Intl Conf. on Knowledge Discovery and Data Mining (KDD), San Jose, California, August 2007

  84. The Haar+ Tree: a Refined Synopsis Data Structure
    Panagiotis Karras and Nikos Mamoulis
    Proc. of the 23rd IEEE Intl Conf. on Data Engineering (ICDE), Istanbul, April 2007

  85. Detecting the Direction of Motion in a Binary Sensor Network
    Panagiotis Karras and Nikos Mamoulis
    Proc. of the 1st IEEE Intl Conf. on Sensor Networks, Ubiquitous, and Trustworthy Computing (SUTC), Taichung, June 2006

  86. One-Pass Wavelet Synopses for Maximum-Error Metrics
    Panagiotis Karras and Nikos Mamoulis
    Proc. of the 31st Intl Conf. on Very Large Data Bases (VLDB), Trondheim, Norway, August 2005