Making large data searchable
String algorithms, compact indexes, pattern matching, and graph problems. Recent work includes uncertain strings, string anchors, and subtree mode queries.
Informatics · King's College London
Associate Professor (Senior Lecturer) in Computer Science
Deputy Head of the Algorithms and Data Analysis Research Group
My research focuses on the design and analysis of algorithms for data mining, indexing, and privacy, with applications in biomedical informatics. My work has appeared in leading international journals and conferences, including PVLDB, The VLDB Journal, Algorithmica, ACM SIGKDD, IEEE ICDE, and IEEE ICDM. I have served on the PVLDB Review Board (2025–2026) and as an Associate Editor of IEEE Transactions on Information Forensics and Security. I previously held a Royal Academy of Engineering Research Fellowship (2011–2016).
Algorithms. Data. Discovery.
Department of Informatics
King's College London, UK
Research
String algorithms, compact indexes, pattern matching, and graph problems. Recent work includes uncertain strings, string anchors, and subtree mode queries.
Pattern discovery in strings and time series, dense subgraphs, and network analysis. Connecting efficient methods with applications in scientific and real-world data.
Privacy-preserving data publishing, anonymization, and differential privacy, including methods for electronic health records and biomedical analysis.
Publication catalogue · 2006–2026
ICDE 2026: 224-237
@inproceedings{conficdeLiGTPL26,
title = {Contextual Pattern Mining and Counting},
author = {Ling Li and Daniel Gibney and Sharma V. Thankachan and Solon P. Pissis and Grigorios Loukides},
year = {2026},
url = {https://dblp.org/rec/conf/icde/LiGTPL26},
note = {ICDE 2026: 224-237}
}ACM Trans. Knowl. Discov. Data 20(1): 14:1-14:33 (2026)
@article{journalstkddConteGLPPP26,
title = {Fast Assessment of Eulerian Trails in Graphs with Applications},
author = {Alessio Conte and Roberto Grossi and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Giulia Punzi},
year = {2026},
url = {https://dblp.org/rec/journals/tkdd/ConteGLPPP26},
note = {ACM Trans. Knowl. Discov. Data 20(1): 14:1-14:33 (2026)}
}Theor. Comput. Sci. 1076: 115932 (2026)
@article{journalstcsVerbeekALP26,
title = {Minimizing the minimizers via alphabet reordering},
author = {Hilde Verbeek and Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis},
year = {2026},
url = {https://dblp.org/rec/journals/tcs/VerbeekALP26},
note = {Theor. Comput. Sci. 1076: 115932 (2026)}
}Theory Comput. Syst. 70(2): 21 (2026)
@article{journalsmstBernardiniCGGLPPS26,
title = {On Strings Having the Same Length-k Substrings},
author = {Giulia Bernardini and Alessio Conte and Estéban Gabory and Roberto Grossi and Grigorios Loukides and Solon P. Pissis and Giulia Punzi and Michelle Sweering},
year = {2026},
url = {https://dblp.org/rec/journals/mst/BernardiniCGGLPPS26},
note = {Theory Comput. Syst. 70(2): 21 (2026)}
}Algorithmica 88(3): 44 (2026)
@article{journalsalgorithmicaAyadLPV26,
title = {Sparse Suffix and LCP Array: Simple, Direct, Small, and Fast},
author = {Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis and Hilde Verbeek},
year = {2026},
url = {https://dblp.org/rec/journals/algorithmica/AyadLPV26},
note = {Algorithmica 88(3): 44 (2026)}
}ICDE 2026: 3152-3167
@inproceedings{conficdeZhouBTGCLP26,
title = {Subtree Mode and Applications},
author = {Jialong Zhou and Ben Bals and Matei Tinca and Ai Guan and Panagiotis Charalampopoulos and Grigorios Loukides and Solon P. Pissis},
year = {2026},
url = {https://dblp.org/rec/conf/icde/ZhouBTGCLP26},
note = {ICDE 2026: 3152-3167}
}SIGMOD Rec. 55(1): 40 (2026)
@article{journalssigmodLoukides26,
title = {Technical perspective on 'Differentially Private Substring and Document Counting'},
author = {Grigorios Loukides},
year = {2026},
url = {https://dblp.org/rec/journals/sigmod/Loukides26},
note = {SIGMOD Rec. 55(1): 40 (2026)}
}CoRR abs/2609.19914 (2026)
@misc{journalscorrabs260919914,
title = {ZigZag Trie: A Novel Index for Contextual Queries},
author = {Ling Li and Daniel Gibney and Sharma V. Thankachan and Rahul Shah and Grigorios Loukides and Solon P. Pissis},
year = {2026},
url = {https://dblp.org/rec/journals/corr/abs-2609-19914},
note = {CoRR abs/2609.19914 (2026)}
}IEEE Trans. Knowl. Data Eng. 37(4): 1853-1870 (2025)
@article{journalstkdeLiVCLGSP25,
title = {Heavy Nodes in a Small Neighborhood: Exact and Peeling Algorithms With Applications},
author = {Ling Li and Hilde Verbeek and Huiping Chen and Grigorios Loukides and Robert Gwadera and Leen Stougie and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/journals/tkde/LiVCLGSP25},
note = {IEEE Trans. Knowl. Data Eng. 37(4): 1853-1870 (2025)}
}ICDE 2025: 2782-2795
@inproceedings{conficdeBernardiniCCGGLPP25,
title = {Indexing Strings with Utilities},
author = {Giulia Bernardini and Huiping Chen and Alessio Conte and Roberto Grossi and Veronica Guerrini and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/conf/icde/BernardiniCCGGLPP25},
note = {ICDE 2025: 2782-2795}
}Data Min. Knowl. Discov. 39(2): 12 (2025)
@article{journalsdatamineBernardiniLLMPSS25,
title = {Missing value replacement in strings and applications},
author = {Giulia Bernardini and Chang Liu and Grigorios Loukides and Alberto Marchetti-Spaccamela and Solon P. Pissis and Leen Stougie and Michelle Sweering},
year = {2025},
url = {https://doi.org/10.1007/s10618-024-01074-3},
doi = {10.1007/s10618-024-01074-3},
note = {Data Min. Knowl. Discov. 39(2): 12 (2025)}
}From Strings to Graphs, and Back Again 2025: 9:1-9:10
@inproceedings{confbirthday0001CLP25,
title = {On String and Graph Sanitization},
author = {Giulia Bernardini and Huiping Chen and Grigorios Loukides and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/conf/birthday/0001CLP25},
note = {From Strings to Graphs, and Back Again 2025: 9:1-9:10}
}ICDM 2025: 81-89
@inproceedings{conficdmBianCAMPL25,
title = {Resilient Pattern Mining},
author = {Pengxin Bian and Panagiotis Charalampopoulos and Lorraine A. K. Ayad and Manal Mohamed and Solon P. Pissis and Grigorios Loukides},
year = {2025},
url = {https://dblp.org/rec/conf/icdm/BianCAMPL25},
note = {ICDM 2025: 81-89}
}VLDB J. 34(5): 58 (2025)
@article{journalsvldbAyadLP25,
title = {Text indexing for long patterns using locally consistent anchors},
author = {Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/journals/vldb/AyadLP25},
note = {VLDB J. 34(5): 58 (2025)}
}SEA 2025: 4:1-4:18
@inproceedings{confweaAyadFKLPPP25,
title = {U-Index: A Universal Indexing Framework for Matching Long Patterns},
author = {Lorraine A. K. Ayad and Gabriele Fici and Ragnar Groot Koerkamp and Grigorios Loukides and Rob Patro and Giulio Ermanno Pibiri and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/conf/wea/AyadFKLPPP25},
note = {SEA 2025: 4:1-4:18}
}CoRR abs/2506.17613 (2025)
@misc{journalscorrabs250617613,
title = {Contextual Pattern Mining and Counting},
author = {Ling Li and Daniel Gibney and Sharma V. Thankachan and Solon P. Pissis and Grigorios Loukides},
year = {2025},
url = {https://dblp.org/rec/journals/corr/abs-2506-17613},
note = {CoRR abs/2506.17613 (2025)}
}CoRR abs/2504.05917 (2025)
@misc{journalscorrabs250405917,
title = {Indexing Strings with Utilities},
author = {Giulia Bernardini and Huiping Chen and Alessio Conte and Roberto Grossi and Veronica Guerrini and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/journals/corr/abs-2504-05917},
note = {CoRR abs/2504.05917 (2025)}
}CoRR abs/2506.04935 (2025)
@misc{journalscorrabs250604935,
title = {Resilient Pattern Mining},
author = {Pengxin Bian and Panagiotis Charalampopoulos and Lorraine A. K. Ayad and Manal Mohamed and Solon P. Pissis and Grigorios Loukides},
year = {2025},
url = {https://dblp.org/rec/journals/corr/abs-2506-04935},
note = {CoRR abs/2506.04935 (2025)}
}CoRR abs/2511.01376 (2025)
@misc{journalscorrabs251101376,
title = {Subtree Mode and Applications},
author = {Jialong Zhou and Ben Bals and Matei Tinca and Ai Guan and Panagiotis Charalampopoulos and Grigorios Loukides and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/journals/corr/abs-2511-01376},
note = {CoRR abs/2511.01376 (2025)}
}CoRR abs/2502.14488 (2025)
@misc{journalscorrabs250214488,
title = {U-index: A Universal Indexing Framework for Matching Long Patterns},
author = {Lorraine A. K. Ayad and Gabriele Fici and Ragnar Groot Koerkamp and Grigorios Loukides and Rob Patro and Giulio Ermanno Pibiri and Solon P. Pissis},
year = {2025},
url = {https://dblp.org/rec/journals/corr/abs-2502-14488},
note = {CoRR abs/2502.14488 (2025)}
}MFCS 2024: 85:1-85:18
@inproceedings{confmfcsZubaLPT24,
title = {Approximate Suffix-Prefix Dictionary Queries},
author = {Wiktor Zuba and Grigorios Loukides and Solon P. Pissis and Sharma V. Thankachan},
year = {2024},
url = {https://dblp.org/rec/conf/mfcs/ZubaLPT24},
note = {MFCS 2024: 85:1-85:18}
}CPM 2024: 6:1-6:16
@inproceedings{confcpm0001CGKLPSS24,
title = {Connecting de Bruijn Graphs},
author = {Giulia Bernardini and Huiping Chen and Inge Li Gørtz and Christoffer Krogh and Grigorios Loukides and Solon P. Pissis and Leen Stougie and Michelle Sweering},
year = {2024},
url = {https://dblp.org/rec/conf/cpm/0001CGKLPSS24},
note = {CPM 2024: 6:1-6:16}
}IEEE Trans. Knowl. Data Eng. 36(9): 4646-4663 (2024)
@article{journalstkdeZhongLCP24,
title = {Ego-Network Segmentation via (Weighted) Jaccard Median},
author = {Haodi Zhong and Grigorios Loukides and Alessio Conte and Solon P. Pissis},
year = {2024},
url = {https://dblp.org/rec/journals/tkde/ZhongLCP24},
note = {IEEE Trans. Knowl. Data Eng. 36(9): 4646-4663 (2024)}
}CPM 2024: 28:1-28:13
@inproceedings{confcpm0001ALP24,
title = {Minimizing the Minimizers via Alphabet Reordering},
author = {Hilde Verbeek and Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis},
year = {2024},
url = {https://dblp.org/rec/conf/cpm/0001ALP24},
note = {CPM 2024: 28:1-28:13}
}ACM Trans. Knowl. Discov. Data 18(6): 135:1-135:43 (2024)
@article{journalstkddChenCGLPS24,
title = {On Breaking Truss-based and Core-based Communities},
author = {Huiping Chen and Alessio Conte and Roberto Grossi and Grigorios Loukides and Solon P. Pissis and Michelle Sweering},
year = {2024},
url = {https://dblp.org/rec/journals/tkdd/ChenCGLPS24},
note = {ACM Trans. Knowl. Discov. Data 18(6): 135:1-135:43 (2024)}
}Algorithmica 86(6): 1948-1978 (2024)
@article{journalsalgorithmicaCharalampopoulosCCLPPR24,
title = {Pattern Masking for Dictionary Matching: Theory and Practice},
author = {Panagiotis Charalampopoulos and Huiping Chen and Peter Christen and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Jakub Radoszewski},
year = {2024},
url = {https://dblp.org/rec/journals/algorithmica/CharalampopoulosCCLPPR24},
note = {Algorithmica 86(6): 1948-1978 (2024)}
}ICDM 2024: 211-220
@inproceedings{conficdm0012ZLPM24,
title = {Scalable Order-Preserving Pattern Mining},
author = {Ling Li and Wiktor Zuba and Grigorios Loukides and Solon P. Pissis and Maria Matsangidou},
year = {2024},
url = {https://dblp.org/rec/conf/icdm/0012ZLPM24},
note = {ICDM 2024: 211-220}
}ICDE 2024: 4828-4842
@inproceedings{conficdeGabory0LPZ24,
title = {Space-Efficient Indexes for Uncertain Strings},
author = {Estéban Gabory and Chang Liu and Grigorios Loukides and Solon P. Pissis and Wiktor Zuba},
year = {2024},
url = {https://dblp.org/rec/conf/icde/Gabory0LPZ24},
note = {ICDE 2024: 4828-4842}
}LATIN (1) 2024: 162-177
@inproceedings{conflatinAyadLPV24,
title = {Sparse Suffix and LCP Array: Simple, Direct, Small, and Fast},
author = {Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis and Hilde Verbeek},
year = {2024},
url = {https://dblp.org/rec/conf/latin/AyadLPV24},
note = {LATIN (1) 2024: 162-177}
}SDM 2024: 190-198
@inproceedings{confsdm0001CCGGLPP24,
title = {Utility-Oriented String Mining},
author = {Giulia Bernardini and Huiping Chen and Alessio Conte and Roberto Grossi and Veronica Guerrini and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis},
year = {2024},
url = {https://dblp.org/rec/conf/sdm/0001CCGGLPP24},
note = {SDM 2024: 190-198}
}CoRR abs/2405.04052 (2024)
@misc{journalscorrabs240504052,
title = {Minimizing the Minimizers via Alphabet Reordering},
author = {Hilde Verbeek and Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis},
year = {2024},
url = {https://dblp.org/rec/journals/corr/abs-2405-04052},
note = {CoRR abs/2405.04052 (2024)}
}CoRR abs/2411.19511 (2024)
@misc{journalscorrabs241119511,
title = {Scalable Order-Preserving Pattern Mining},
author = {Ling Li and Wiktor Zuba and Grigorios Loukides and Solon P. Pissis and Maria Matsangidou},
year = {2024},
url = {https://dblp.org/rec/journals/corr/abs-2411-19511},
note = {CoRR abs/2411.19511 (2024)}
}CoRR abs/2403.14256 (2024)
@misc{journalscorrabs240314256,
title = {Space-Efficient Indexes for Uncertain Strings},
author = {Estéban Gabory and Chang Liu and Grigorios Loukides and Solon P. Pissis and Wiktor Zuba},
year = {2024},
url = {https://dblp.org/rec/journals/corr/abs-2403-14256},
note = {CoRR abs/2403.14256 (2024)}
}CoRR abs/2407.11819 (2024)
@misc{journalscorrabs240711819,
title = {Text Indexing for Long Patterns using Locally Consistent Anchors},
author = {Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis},
year = {2024},
url = {https://dblp.org/rec/journals/corr/abs-2407-11819},
note = {CoRR abs/2407.11819 (2024)}
}IEEE Trans. Knowl. Data Eng. 35(11): 11093-11111 (2023)
@article{journalstkdeLoukidesPS23,
title = {Bidirectional String Anchors for Improved Text Indexing and Top-K Similarity Search},
author = {Grigorios Loukides and Solon P. Pissis and Michelle Sweering},
year = {2023},
url = {https://dblp.org/rec/journals/tkde/LoukidesPS23},
note = {IEEE Trans. Knowl. Data Eng. 35(11): 11093-11111 (2023)}
}SPIRE 2023: 345-352
@inproceedings{confspirePissisSLL23,
title = {Frequency-Constrained Substring Complexity},
author = {Solon P. Pissis and Michael Shekelyan and Chang Liu and Grigorios Loukides},
year = {2023},
url = {https://dblp.org/rec/conf/spire/PissisSLL23},
note = {SPIRE 2023: 345-352}
}SDM 2023: 307-315
@inproceedings{confsdmChenLGP23,
title = {Heavy Nodes in a Small Neighborhood: Algorithms and Applications},
author = {Huiping Chen and Grigorios Loukides and Robert Gwadera and Solon P. Pissis},
year = {2023},
url = {https://dblp.org/rec/conf/sdm/ChenLGP23},
note = {SDM 2023: 307-315}
}IEEE Trans. Knowl. Data Eng. 35(6): 5948-5963 (2023)
@article{journalstkdeBernardiniCGGLPPPSS23,
title = {Hide and Mine in Strings: Hardness, Algorithms, and Experiments},
author = {Giulia Bernardini and Alessio Conte and Garance Gourdel and Roberto Grossi and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Giulia Punzi and Leen Stougie and Michelle Sweering},
year = {2023},
url = {https://dblp.org/rec/journals/tkde/BernardiniCGGLPPPSS23},
note = {IEEE Trans. Knowl. Data Eng. 35(6): 5948-5963 (2023)}
}CPM 2023: 21:1-21:20
@inproceedings{confcpmLoukidesPTZ23,
title = {Suffix-Prefix Queries on a Dictionary},
author = {Grigorios Loukides and Solon P. Pissis and Sharma V. Thankachan and Wiktor Zuba},
year = {2023},
url = {https://dblp.org/rec/conf/cpm/LoukidesPTZ23},
note = {CPM 2023: 21:1-21:20}
}Proc. VLDB Endow. 16(9): 2117-2131 (2023)
@article{journalspvldbAyadLP23,
title = {Text Indexing for Long Patterns: Anchors are All you Need},
author = {Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis},
year = {2023},
url = {https://dblp.org/rec/journals/pvldb/AyadLP23},
note = {Proc. VLDB Endow. 16(9): 2117-2131 (2023)}
}CoRR abs/2310.09023 (2023)
@misc{journalscorrabs231009023,
title = {Sparse Suffix and LCP Array: Simple, Direct, Small, and Fast},
author = {Lorraine A. K. Ayad and Grigorios Loukides and Solon P. Pissis and Hilde Verbeek},
year = {2023},
url = {https://dblp.org/rec/journals/corr/abs-2310-09023},
note = {CoRR abs/2310.09023 (2023)}
}Inf. Process. Lett. 178: 106275 (2022)
@article{journalsiplLoukidesP22,
title = {All-pairs suffix/prefix in optimal time using Aho-Corasick space},
author = {Grigorios Loukides and Solon P. Pissis},
year = {2022},
url = {https://dblp.org/rec/journals/ipl/LoukidesP22},
note = {Inf. Process. Lett. 178: 106275 (2022)}
}IEEE J. Biomed. Health Informatics 26(5): 2351-2359 (2022)
@article{journalstitbZhongLP22,
title = {Clustering Demographics and Sequences of Diagnosis Codes},
author = {Haodi Zhong and Grigorios Loukides and Solon P. Pissis},
year = {2022},
url = {https://doi.org/10.1109/JBHI.2021.3129461},
doi = {10.1109/JBHI.2021.3129461},
note = {IEEE J. Biomed. Health Informatics 26(5): 2351-2359 (2022)}
}Data Knowl. Eng. 138: 101981 (2022)
@article{journalsdkeZhongLP22,
title = {Clustering sequence graphs},
author = {Haodi Zhong and Grigorios Loukides and Solon P. Pissis},
year = {2022},
url = {https://dblp.org/rec/journals/dke/ZhongLP22},
note = {Data Knowl. Eng. 138: 101981 (2022)}
}ICDM 2022: 1353-1358
@inproceedings{conficdmZhongLCP22,
title = {Jaccard Median for Ego-network Segmentation},
author = {Haodi Zhong and Grigorios Loukides and Alessio Conte and Solon P. Pissis},
year = {2022},
url = {https://dblp.org/rec/conf/icdm/ZhongLCP22},
note = {ICDM 2022: 1353-1358}
}CPM 2022: 12:1-12:18
@inproceedings{confcpm0001CLPSS22,
title = {Making de Bruijn Graphs Eulerian},
author = {Giulia Bernardini and Huiping Chen and Grigorios Loukides and Solon P. Pissis and Leen Stougie and Michelle Sweering},
year = {2022},
url = {https://dblp.org/rec/conf/cpm/0001CLPSS22},
note = {CPM 2022: 12:1-12:18}
}CPM 2022: 16:1-16:17
@inproceedings{confcpm0001CGGLPPS22,
title = {On Strings Having the Same Length- k Substrings},
author = {Giulia Bernardini and Alessio Conte and Estéban Gabory and Roberto Grossi and Grigorios Loukides and Solon P. Pissis and Giulia Punzi and Michelle Sweering},
year = {2022},
url = {https://dblp.org/rec/conf/cpm/0001CGGLPPS22},
note = {CPM 2022: 16:1-16:17}
}CoRR abs/2201.13376 (2022)
@misc{journalscorrabs220113376,
title = {Differentially Private Top-k Selection via Canonical Lipschitz Mechanism},
author = {Michael Shekelyan and Grigorios Loukides},
year = {2022},
url = {https://dblp.org/rec/journals/corr/abs-2201-13376},
note = {CoRR abs/2201.13376 (2022)}
}FCT 2021: 162-175
@inproceedings{conffctConteGLPPP21,
title = {Beyond the BEST Theorem: Fast Assessment of Eulerian Trails},
author = {Alessio Conte and Roberto Grossi and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Giulia Punzi},
year = {2021},
url = {https://dblp.org/rec/conf/fct/ConteGLPPP21},
note = {FCT 2021: 162-175}
}ESA 2021: 64:1-64:21
@inproceedings{confesaLoukidesP21,
title = {Bidirectional String Anchors: A New String Sampling Mechanism},
author = {Grigorios Loukides and Solon P. Pissis},
year = {2021},
url = {https://dblp.org/rec/conf/esa/LoukidesP21},
note = {ESA 2021: 64:1-64:21}
}ACM Trans. Knowl. Discov. Data 15(1): 8:1-8:34 (2021)
@article{journalstkddBernardiniCCGLP21,
title = {Combinatorial Algorithms for String Sanitization},
author = {Giulia Bernardini and Huiping Chen and Alessio Conte and Roberto Grossi and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Giovanna Rosone and Michelle Sweering},
year = {2021},
url = {https://dblp.org/rec/journals/tkdd/BernardiniCCGLP21},
note = {ACM Trans. Knowl. Discov. Data 15(1): 8:1-8:34 (2021)}
}ICDM 2021: 41-50
@inproceedings{conficdmChenDFLPS21,
title = {Differentially Private String Sanitization for Frequency-Based Mining Tasks},
author = {Huiping Chen and Changyu Dong and Liyue Fan and Grigorios Loukides and Solon P. Pissis and Leen Stougie},
year = {2021},
url = {https://dblp.org/rec/conf/icdm/ChenDFLPS21},
note = {ICDM 2021: 41-50}
}USENIX Security Symposium 2021: 965-982
@inproceedings{confussHu0LGWGLD21,
title = {How to Make Private Distributed Cardinality Estimation Practical, and Get Differential Privacy for Free},
author = {Changhui Hu and Jin Li and Zheli Liu and Xiaojie Guo and Yu Wei and Xuan Guang and Grigorios Loukides and Changyu Dong},
year = {2021},
url = {https://dblp.org/rec/conf/uss/Hu0LGWGLD21},
note = {USENIX Security Symposium 2021: 965-982}
}Theor. Comput. Sci. 852: 84-103 (2021)
@article{journalstcsChenLPC21,
title = {Influence maximization in the presence of vulnerable nodes: A ratio perspective},
author = {Huiping Chen and Grigorios Loukides and Solon P. Pissis and Hau Chan},
year = {2021},
url = {https://dblp.org/rec/journals/tcs/ChenLPC21},
note = {Theor. Comput. Sci. 852: 84-103 (2021)}
}SDM 2021: 414-422
@inproceedings{confsdmZhengCLL21,
title = {Maximizing Approximately k-Submodular Functions},
author = {Leqian Zheng and Hau Chan and Grigorios Loukides and Minming Li},
year = {2021},
url = {https://dblp.org/rec/conf/sdm/ZhengCLL21},
note = {SDM 2021: 414-422}
}KDD 2021: 117-126
@inproceedings{confkddChenCGLPS21,
title = {On Breaking Truss-Based Communities},
author = {Huiping Chen and Alessio Conte and Roberto Grossi and Grigorios Loukides and Solon P. Pissis and Michelle Sweering},
year = {2021},
url = {https://dblp.org/rec/conf/kdd/ChenCGLPS21},
note = {KDD 2021: 117-126}
}ISAAC 2021: 65:1-65:19
@inproceedings{confisaacCharalampopoulos21,
title = {Pattern Masking for Dictionary Matching},
author = {Panagiotis Charalampopoulos and Huiping Chen and Peter Christen and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Jakub Radoszewski},
year = {2021},
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}ACM J. Exp. Algorithmics 26: 1.10:1-1.10:26 (2021)
@article{journalsjeaBernardiniCFLP21,
title = {Reverse-Safe Text Indexing},
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year = {2021},
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note = {ACM J. Exp. Algorithmics 26: 1.10:1-1.10:26 (2021)}
}CoRR abs/2101.07157 (2021)
@misc{journalscorrabs210107157,
title = {Maximizing approximately k-submodular functions},
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year = {2021},
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}CoRR abs/2112.10376 (2021)
@misc{journalscorrabs211210376,
title = {String Sampling with Bidirectional String Anchors},
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year = {2021},
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}ECML/PKDD (3) 2020: 3-19
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title = {Algorithms for Optimizing the Ratio of Monotone k-Submodular Functions},
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note = {ECML/PKDD (3) 2020: 3-19}
}J. Biomed. Informatics 102: 103360 (2020)
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title = {Clustering datasets with demographics and diagnosis codes},
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note = {J. Biomed. Informatics 102: 103360 (2020)}
}AINA 2020: 1007-1019
@inproceedings{confainaAlamroIL20,
title = {Efficiently Detecting Web Spambots in a Temporally Annotated Sequence},
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note = {AINA 2020: 1007-1019}
}ICDM 2020: 924-929
@inproceedings{conficdm0001CGGLPPPSS20,
title = {Hide and Mine in Strings: Hardness and Algorithms},
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}Knowl. Inf. Syst. 62(7): 2613-2651 (2020)
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}ACM Trans. Internet Techn. 20(4): 39:1-39:31 (2020)
@article{journalstoitLoukidesGC20,
title = {Overexposure-Aware Influence Maximization},
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year = {2020},
url = {https://dblp.org/rec/journals/toit/LoukidesGC20},
note = {ACM Trans. Internet Techn. 20(4): 39:1-39:31 (2020)}
}ALENEX 2020: 199-213
@inproceedings{confalenex0001CFLP20,
title = {Reverse-Safe Data Structures for Text Indexing},
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}CPM 2020: 7:1-7:14
@inproceedings{confcpm0001CLPPSS20,
title = {String Sanitization Under Edit Distance},
author = {Giulia Bernardini and Huiping Chen and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Leen Stougie and Michelle Sweering},
year = {2020},
url = {https://dblp.org/rec/conf/cpm/0001CLPPSS20},
note = {CPM 2020: 7:1-7:14}
}IACR Cryptol. ePrint Arch. 2020: 1576 (2020)
@misc{journalsiacrHuLLGWGLD20,
title = {How to Make Private Distributed Cardinality Estimation Practical, and Get Differential Privacy for Free},
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note = {IACR Cryptol. ePrint Arch. 2020: 1576 (2020)}
}CoRR abs/2006.16137 (2020)
@misc{journalscorrabs200616137,
title = {Pattern Masking for Dictionary Matching},
author = {Panagiotis Charalampopoulos and Huiping Chen and Peter Christen and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Jakub Radoszewski},
year = {2020},
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note = {CoRR abs/2006.16137 (2020)}
}AINA 2019: 1106-1122
@inproceedings{confainaChenLFC19,
title = {Limiting the Influence to Vulnerable Users in Social Networks: A Ratio Perspective},
author = {Huiping Chen and Grigorios Loukides and Jiashi Fan and Hau Chan},
year = {2019},
url = {https://dblp.org/rec/conf/aina/ChenLFC19},
note = {AINA 2019: 1106-1122}
}ECML/PKDD (1) 2019: 627-644
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title = {String Sanitization: A Combinatorial Approach},
author = {Giulia Bernardini and Huiping Chen and Alessio Conte and Roberto Grossi and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Giovanna Rosone},
year = {2019},
url = {https://dblp.org/rec/conf/pkdd/0001CCGLPPR19},
note = {ECML/PKDD (1) 2019: 627-644}
}CoRR abs/1912.00055 (2019)
@misc{journalscorrabs191200055,
title = {Location histogram privacy by sensitive location hiding and target histogram avoidance/resemblance (extended version)},
author = {Grigorios Loukides and George Theodorakopoulos},
year = {2019},
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note = {CoRR abs/1912.00055 (2019)}
}CoRR abs/1906.11030 (2019)
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title = {String Sanitization: A Combinatorial Approach},
author = {Giulia Bernardini and Huiping Chen and Alessio Conte and Roberto Grossi and Grigorios Loukides and Nadia Pisanti and Solon P. Pissis and Giovanna Rosone},
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}Int. J. Data Sci. Anal. 5(1): 19-39 (2018)
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note = {Int. J. Data Sci. Anal. 5(1): 19-39 (2018)}
}AIAI (Workshops) 2018: 200-210
@inproceedings{confifip12AjalaAIL18,
title = {Towards String Sanitization},
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year = {2018},
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note = {AIAI (Workshops) 2018: 200-210}
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@misc{journalsiacrDongL18,
title = {Approximating Private Set Union/Intersection Cardinality with Logarithmic Complexity},
author = {Changyu Dong and Grigorios Loukides},
year = {2018},
url = {https://dblp.org/rec/journals/iacr/DongL18},
note = {IACR Cryptol. ePrint Arch. 2018: 495 (2018)}
}J. Biomed. Informatics 65: 76-96 (2017)
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title = {Anonymizing datasets with demographics and diagnosis codes in the presence of utility constraints},
author = {Giorgos Poulis and Grigorios Loukides and Spiros Skiadopoulos and Aris Gkoulalas-Divanis},
year = {2017},
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title = {Approximating Private Set Union/Intersection Cardinality With Logarithmic Complexity},
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note = {IEEE Trans. Inf. Forensics Secur. 12(11): 2792-2806 (2017)}
}PAKDD (1) 2017: 251-265
@inproceedings{confpakddGwaderaL17,
title = {Cost-Effective Viral Marketing in the Latency Aware Independent Cascade Model},
author = {Robert Gwadera and Grigorios Loukides},
year = {2017},
url = {https://dblp.org/rec/conf/pakdd/GwaderaL17},
note = {PAKDD (1) 2017: 251-265}
}DSAA 2016: 90-99
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title = {Limiting the Diffusion of Information by a Selective PageRank-Preserving Approach},
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note = {DSAA 2016: 90-99}
}ISPDC 2015: 235-241
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title = {A Parallel Method for Scalable Anonymization of Transaction Data},
author = {Neelam Memon and Grigorios Loukides and Jianhua Shao},
year = {2015},
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note = {ISPDC 2015: 235-241}
}Medical Data Privacy Handbook 2015: 17-34
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title = {A Survey of Anonymization Algorithms for Electronic Health Records},
author = {Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2015},
url = {https://dblp.org/rec/books/sp/15/Gkoulalas-DivanisL15a},
note = {Medical Data Privacy Handbook 2015: 17-34}
}Medical Data Privacy Handbook 2015: 765-773
@misc{bookssp15GkoulalasDivanisL15b,
title = {Epilogue},
author = {Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2015},
url = {https://dblp.org/rec/books/sp/15/Gkoulalas-DivanisL15b},
note = {Medical Data Privacy Handbook 2015: 765-773}
}Medical Data Privacy Handbook 2015: 1-14
@misc{bookssp15GkoulalasDivanisL15,
title = {Introduction to Medical Data Privacy},
author = {Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2015},
url = {https://dblp.org/rec/books/sp/15/Gkoulalas-DivanisL15},
note = {Medical Data Privacy Handbook 2015: 1-14}
}Springer 2015, ISBN 978-3-319-23632-2 [contents]
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title = {Medical Data Privacy Handbook},
author = {Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2015},
url = {https://dblp.org/rec/books/sp/GL2015},
note = {Springer 2015, ISBN 978-3-319-23632-2 [contents]}
}SDM 2015: 775-783
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title = {Optimal event sequence sanitization},
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year = {2015},
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note = {SDM 2015: 775-783}
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title = {SECRETA: A Tool for Anonymizing Relational, Transaction and RT-Datasets},
author = {Giorgos Poulis and Aris Gkoulalas-Divanis and Grigorios Loukides and Spiros Skiadopoulos and Christos Tryfonopoulos},
year = {2015},
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note = {Medical Data Privacy Handbook 2015: 83-109}
}Medical Data Privacy Handbook 2015: 149-177
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title = {Utility-Constrained Electronic Health Record Data Publishing Through Generalization and Disassociation},
author = {Grigorios Loukides and John Liagouris and Aris Gkoulalas-Divanis and Manolis Terrovitis},
year = {2015},
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}Trans. Data Priv. 7(2): 165-194 (2014)
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title = {Apriori-based algorithms for kᵐ-anonymizing trajectory data},
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title = {Disassociation for electronic health record privacy},
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note = {J. Biomed. Informatics 50: 46-61 (2014)}
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title = {Informatics methods in medical privacy},
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note = {J. Biomed. Informatics 50: 1-3 (2014)}
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title = {Publishing data from electronic health records while preserving privacy: A survey of algorithms},
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note = {J. Biomed. Informatics 50: 4-19 (2014)}
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title = {SECRETA: A System for Evaluating and Comparing RElational and Transaction Anonymization algorithms},
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title = {Toward smarter healthcare: Anonymizing medical data to support research studies},
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}Springer Briefs in Electrical and Computer Engineering, Springer 2013, ISBN 978-1-4614-5667-4, pp. i-xv, 1-72
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title = {Anonymization of Electronic Medical Records to Support Clinical Analysis},
author = {Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2013},
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note = {Springer Briefs in Electrical and Computer Engineering, Springer 2013, ISBN 978-1-4614-5667-4, pp. i-xv, 1-72}
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title = {Anonymizing Data with Relational and Transaction Attributes},
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title = {Correction: Enabling Genomic-Phenomic Association Discovery without Sacrificing Anonymity},
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year = {2013},
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doi = {10.1371/annotation/db45627a-50ec-4c52-8b5f-95dec75b1c80},
note = {PloS one 8(6)}
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title = {Distance-Based kᵐ-Anonymization of Trajectory Data},
author = {Giorgos Poulis and Spiros Skiadopoulos and Grigorios Loukides and Aris Gkoulalas-Divanis},
year = {2013},
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title = {Efficient and flexible anonymization of transaction data},
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note = {Knowl. Inf. Syst. 36(1): 153-210 (2013)}
}PloS one 8(2): e53875
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title = {Enabling genomic-phenomic association discovery without sacrificing anonymity},
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year = {2013},
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title = {Hiding Sensitive Patterns from Sequence Databases: Research Challenges and Solutions},
author = {Grigorios Loukides and Aris Gkoulalas-Divanis},
year = {2013},
url = {https://dblp.org/rec/conf/mdm/LoukidesG13},
note = {MDM (2) 2013: 45-50}
}ICDM 2013: 241-250
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title = {Permutation-Based Sequential Pattern Hiding},
author = {Robert Gwadera and Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2013},
url = {https://dblp.org/rec/conf/icdm/GwaderaGL13},
note = {ICDM 2013: 241-250}
}ICDM Workshops 2013: 867-874
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title = {Select-Organize-Anonymize: A Framework for Trajectory Data Anonymization},
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year = {2013},
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title = {Utility-Aware Anonymization of Diagnosis Codes},
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title = {Anonymization of Longitudinal Electronic Medical Records},
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}Expert Syst. Appl. 38(4): 4559-4574 (2011)
@article{journalseswaLoukidesS11,
title = {Preventing range disclosure in k-anonymised data},
author = {Grigorios Loukides and Jianhua Shao},
year = {2011},
url = {https://dblp.org/rec/journals/eswa/LoukidesS11},
note = {Expert Syst. Appl. 38(4): 4559-4574 (2011)}
}KDD 2011: 1316-1324
@inproceedings{confkddGkoulalasDivanisL11,
title = {Revisiting sequential pattern hiding to enhance utility},
author = {Aris Gkoulalas-Divanis and Grigorios Loukides},
year = {2011},
url = {https://dblp.org/rec/conf/kdd/Gkoulalas-DivanisL11},
note = {KDD 2011: 1316-1324}
}AMIA ... Annual Symposium proceedings. AMIA Symposium 2010: 782
@inproceedings{pubmed21347085,
title = {Anonymization of administrative billing codes with repeated diagnoses through censoring},
author = {Acar Tamersoy and Grigorios Loukides and Joshua C Denny and Bradley Malin},
year = {2010},
url = {https://pubmed.ncbi.nlm.nih.gov/21347085/},
note = {AMIA ... Annual Symposium proceedings. AMIA Symposium 2010: 782}
}Proceedings of the National Academy of Sciences of the United States of America 107(17): 7898
@article{pubmed20385806,
title = {Anonymization of electronic medical records for validating genome-wide association studies},
author = {Grigorios Loukides and Aris Gkoulalas-Divanis and Bradley Malin},
year = {2010},
url = {https://doi.org/10.1073/pnas.0911686107},
doi = {10.1073/pnas.0911686107},
note = {Proceedings of the National Academy of Sciences of the United States of America 107(17): 7898}
}DEXA (1) 2010: 400-415
@inproceedings{confdexaLoukidesGS10,
title = {Anonymizing Transaction Data to Eliminate Sensitive Inferences},
author = {Grigorios Loukides and Aris Gkoulalas-Divanis and Jianhua Shao},
year = {2010},
url = {https://dblp.org/rec/conf/dexa/LoukidesGS10},
note = {DEXA (1) 2010: 400-415}
}IHI 2010: 163-172
@inproceedings{confihiBenitezLM10,
title = {Beyond safe harbor: automatic discovery of health information de-identification policy alternatives},
author = {Kathleen Benitez and Grigorios Loukides and Bradley A. Malin},
year = {2010},
url = {https://doi.org/10.1145/1882992.1883017},
doi = {10.1145/1882992.1883017},
note = {IHI 2010: 163-172}
}ITAB 2010 Corfu, Greece : 10th International Conference on Information Technology and Applications in Biomedicine : Emerging Technologies for Patient Specific Healthcare : 2-5 November 2010, Aquis Corfu Holiday Palace Hotel, Greece. Int... 2010: 1
@inproceedings{pubmed25580471,
title = {Privacy-Preserving Publication of Diagnosis Codes for Effective Biomedical Analysis},
author = {Grigorios Loukides and Aris Gkoulalas-Divanis and Bradley Malin},
year = {2010},
url = {https://doi.org/10.1109/ITAB.2010.5687720},
doi = {10.1109/ITAB.2010.5687720},
note = {ITAB 2010 Corfu, Greece : 10th International Conference on Information Technology and Applications in Biomedicine : Emerging Technologies for Patient Specific Healthcare : 2-5 November 2010, Aquis Corfu Holiday Palace Hotel, Greece. Int... 2010: 1}
}J. Am. Medical Informatics Assoc. 17(3): 322-327 (2010)
@article{journalsjamiaLoukidesDM10,
title = {The disclosure of diagnosis codes can breach research participants' privacy},
author = {Grigorios Loukides and Joshua C. Denny and Bradley A. Malin},
year = {2010},
url = {https://doi.org/10.1136/jamia.2009.002725},
doi = {10.1136/jamia.2009.002725},
note = {J. Am. Medical Informatics Assoc. 17(3): 322-327 (2010)}
}ACM Crossroads 16(2): 14-18 (2009)
@article{journalscrossroadsLoukidesG09,
title = {Privacy challenges and solutions in the social web},
author = {Grigorios Loukides and Aris Gkoulalas-Divanis},
year = {2009},
url = {https://dblp.org/rec/journals/crossroads/LoukidesG09},
note = {ACM Crossroads 16(2): 14-18 (2009)}
}DASFAA Workshops 2009: 231-245
@inproceedings{confdasfaaLoukidesTS09,
title = {Towards Preference-Constrained k-Anonymisation},
author = {Grigorios Loukides and Achilles Tziatzios and Jianhua Shao},
year = {2009},
url = {https://dblp.org/rec/conf/dasfaa/LoukidesTS09},
note = {DASFAA Workshops 2009: 231-245}
}CoRR abs/0912.2548 (2009)
@misc{journalscorrabs09122548,
title = {COAT: COnstraint-based Anonymization of Transactions},
author = {Grigorios Loukides and Aris Gkoulalas-Divanis and Bradley A. Malin},
year = {2009},
url = {https://dblp.org/rec/journals/corr/abs-0912-2548},
note = {CoRR abs/0912.2548 (2009)}
}J. Comput. Sci. Technol. 23(2): 188-202 (2008)
@article{journalsjcstLoukidesS08,
title = {An Efficient Clustering Algorithm for k -Anonymisation},
author = {Grigorios Loukides and Jianhua Shao},
year = {2008},
url = {https://dblp.org/rec/journals/jcst/LoukidesS08},
note = {J. Comput. Sci. Technol. 23(2): 188-202 (2008)}
}BNCOD 2008: 15-27
@inproceedings{confbncodLoukidesS07a,
title = {An Empirical Study of Utility Measures for k-Anonymisation},
author = {Grigorios Loukides and Jianhua Shao},
year = {2008},
url = {https://dblp.org/rec/conf/bncod/LoukidesS07a},
note = {BNCOD 2008: 15-27}
}PAIS 2008: 36-45
@inproceedings{confedbtLoukidesS08,
title = {Data utility and privacy protection trade-off in k-anonymisation},
author = {Grigorios Loukides and Jianhua Shao},
year = {2008},
url = {https://dblp.org/rec/conf/edbt/LoukidesS08},
note = {PAIS 2008: 36-45}
}SAC 2007: 370-374
@inproceedings{confsacLoukidesS07,
title = {Capturing data usefulness and privacy protection in K-anonymisation},
author = {Grigorios Loukides and Jianhua Shao},
year = {2007},
url = {https://dblp.org/rec/conf/sac/LoukidesS07},
note = {SAC 2007: 370-374}
}DEXA 2007: 761-771
@inproceedings{confdexaLoukidesS07,
title = {Clustering-Based K-Anonymisation Algorithms},
author = {Grigorios Loukides and Jianhua Shao},
year = {2007},
url = {https://dblp.org/rec/conf/dexa/LoukidesS07},
note = {DEXA 2007: 761-771}
}BNCOD 2007: 203-214
@inproceedings{confbncodLoukidesS07,
title = {Speeding Up Clustering-Based k -Anonymisation Algorithms with Pre-partitioning},
author = {Grigorios Loukides and Jianhua Shao},
year = {2007},
url = {https://dblp.org/rec/conf/bncod/LoukidesS07},
note = {BNCOD 2007: 203-214}
}CIT 2006: 15
@inproceedings{confIEEEcitLoukidesS06,
title = {Towards Balancing Data Usefulness and Privacy Protection in K-Anonymisation},
author = {Grigorios Loukides and Jianhua Shao},
year = {2006},
url = {https://dblp.org/rec/conf/IEEEcit/LoukidesS06},
note = {CIT 2006: 15}
}No matching publications. Try a different term or reset the filters.
Compiled on 20 October 2026. The source union contains 126 DBLP records and 18 PubMed records, with 12 overlaps. The thesis is excluded from the displayed catalogue and BibTeX export, leaving 131 records. Twenty entries visible in an older indexed Google Scholar profile snapshot were checked and matched to existing entries. Scholar restricted further retrieval, so this is not a verified complete Google Scholar bibliography. Citation counts and h-index are deliberately omitted.
Records are reconciled using normalized titles, compatible years, and publication type. Separate publication versions and corrections are retained. The total is a count of bibliographic records, not a count of unique research contributions. Google Scholar badges mean an entry was observed in that snapshot; their absence does not mean a paper is absent from Scholar.
Academic service
Editorial work, programme committees and conference organisation.
About
I am an Associate Professor (Senior Lecturer) in the Department of Informatics at King's College London. My interests span data mining, data privacy, biomedical informatics, and data science.
Before joining King's, I held an Assistant Professor position at Cardiff University and a Royal Academy of Engineering Research Fellowship (2011–2016). Earlier, I was a postdoctoral researcher in Biomedical Informatics at Vanderbilt University.
I earned my PhD in Computer Science at Cardiff University and my Diploma in Computer Science at the University of Crete. I am a Fellow of the Higher Education Academy and a member of ACM.
Biography at King's ↗