Dr Nikos Ntarmos
- Honorary Senior Research Fellow (School of Computing Science)
email:
Nikos.Ntarmos@glasgow.ac.uk
Room S122, School of Computing Science, Sir Alwyn William's Building, Glasgow G12 8RZ
Biography
I am a Senior Lecturer at the School of Computing Science at the University of Glasgow, UK, where I am a member of the IDA and GLASS sections and the IDEAS research lab. I received my PhD and MSc in Computing Engineering & Informatics from the University of Patras, Greece, in 2008 and 2004 respectively, and my undergraduate diploma (5-year MEng equivalent) in Electronic & Computer Engineering from the Technical University of Crete, Greece, in 2002.
From 2013 till 2017 I was a Lord Kelvin Adam Smith Fellow at the School of Computing Science, University of Glasgow, UK. Prior to that, I worked as a postdoctoral researcher at the University of Patras, Greece, and as an adjunct assistant professor at the University of Ioannina, Greece. I am a member of the IEEE, the ACM, and the Technical Chamber of Greece (TEE). I have also worked as a research engineer, software engineer, senior systems administrator, and routinely contribute to open-source projects.
Personal site: https://ntarmos.info/
Research interests
My research interests lie in the areas of distributed computing and large-scale data management systems. My current research work focuses on issues pertaining to distributed (Big) data management, with a special interest in storage, indexing and query processing in distributed NoSQL data stores, graph databases, geo-distributed data management infrastructures, and joint in-rest and streaming data processing.
Within the School of Computing Science, I am a member of the Information, Data and Analysis (IDA) Section, the Glasgow Systems Section (GLASS) and the Information, Data, Events, Analytics at Scale (IDEAS) research lab.
Publications
2023
Al-Anqoudi, Maha, Bikanga Ada, Mireilla ORCID: https://orcid.org/0000-0001-5406-6935, McQuistin, Stephen
ORCID: https://orcid.org/0000-0002-0616-2532, Ntarmos, Nikos
ORCID: https://orcid.org/0000-0001-8676-0948, Parkinson, Jack
ORCID: https://orcid.org/0000-0001-6175-7638 and Moshfeghi, Yashar
(2023)
Traditional Vs Non-Traditional Assessment Activities as Learning Indicators of Student Learning: Teachers’ Perceptions.
In: 2023 IEEE Learning with MOOCS (LWMOOCS), Cambridge, MA, USA, 11-13 Oct 2023,
ISBN 9798350315592
(doi: 10.1109/LWMOOCS58322.2023.10305928)
Paun, Iulia, Moshfeghi, Yashar and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2023)
White-box: on the prediction of collaborative filtering recommendation systems' performance.
ACM Transactions on Internet Technology, 23(1),
8.
(doi: 10.1145/3554979)
2021
Paun, Iulia, Moshfeghi, Yashar and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2021)
Are we there yet? Estimating Training Time for Recommendation Systems.
In: EuroMLSys ’21, 26 Apr 2021,
pp. 39-47.
ISBN 9781450382984
(doi: 10.1145/3437984.3458832)
2020
Kyosev, Ivan, Paun, Iulia, Moshfeghi, Yashar and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2020)
Measuring Distances Among Graphs En Route To Graph Clustering.
In: 5th IEEE Workshop on Advances in High-Dimensional Big Data 2020, IEEE Big Data 2020, 10-13 Dec 2020,
pp. 3632-3641.
ISBN 9781728162515
(doi: 10.1109/BigData50022.2020.9378333)
Morgan, Conor, Paun, Iulia and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2020)
Exploring Contextual Paradigms in Context-Aware Recommendations.
In: 4th IEEE Workshop on Human-in-the-Loop Methods and Future of Work in Big Data 2020, IEEE Big Data 2020, Atlanta, GA, USA, 10-13 Dec 2020,
ISBN 9781728162515
(doi: 10.1109/BigData50022.2020.9377964)
2019
Cahsai, Atoshum, Anagnostopoulos, Christos ORCID: https://orcid.org/0000-0003-1517-6757, Ntarmos, Nikos
ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2019)
Revisiting Exact kNN Query Processing with Probabilistic Data Space Transformations.
In: 2018 IEEE International Conference on Big Data, Seattle, WA, USA, 10-13 Dec 2018,
pp. 653-662.
ISBN 9781538650356
(doi: 10.1109/BigData.2018.8621943)
2018
Wang, Jing, Liu, Zichen, Ma, Shuai, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2018)
GC: A Graph Caching System for Subgraph/Supergraph Queries.
In: 44th International Conference on Very Large Data Bases (VLDB 2018), Rio de Janeiro, Brazil, 27-31 Aug 2018,
pp. 2022-2025.
(doi: 10.14778/3229863.3236250)
Katsarou, Foteini, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2018)
Hybrid Algorithms for Subgraph Pattern Queries in Graph Databases.
In: 2017 IEEE International Conference on Big Data (IEEE BigData 2017), Boston, MA, USA, 11-14 Dec 2017,
pp. 656-665.
ISBN 9781538627150
(doi: 10.1109/BigData.2017.8257981)
Popescu, Iulia, Portelli, Kurt, Anagnostopoulos, Christos ORCID: https://orcid.org/0000-0003-1517-6757 and Ntarmos, Nikolaos
ORCID: https://orcid.org/0000-0001-8676-0948
(2018)
The Case for Graph-Based Recommendations.
In: 2017 IEEE International Conference on Big Data (IEEE BigData 2017), Boston, MA, USA, 11-14 Dec 2017,
pp. 4819-4821.
ISBN 9781538627150
(doi: 10.1109/BigData.2017.8258553)
2017
Donaldson, Peter ORCID: https://orcid.org/0000-0001-5984-5911, Ntarmos, Nikolaos
ORCID: https://orcid.org/0000-0001-8676-0948 and Portelli, Kurt
(2017)
A Systematic Review of the Potential of Machine Learning and Data Science in Primary and Secondary Education.
Discussion Paper.
Royal Society.
(Unpublished)
Cahsai, Atoshum, Anagnostopoulos, Christos ORCID: https://orcid.org/0000-0003-1517-6757, Ntarmos, Nikolaos
ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
Scaling k-Nearest Neighbors Queries (The Right Way).
In: 2017 IEEE 37th International Conference on Distributed Computing Systems (ICDCS), Atlanta, GA, USA, 5-8 June 2017,
pp. 1419-1430.
ISBN 9781538617939
(doi: 10.1109/ICDCS.2017.267)
Katsarou, Foteini, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
Subgraph Querying with Parallel Use of Query Rewritings and Alternative Algorithms.
In: International Conference on Extending Database Technology (EDBT) 2017, Venice, Italy, 21-24 March 2017,
pp. 25-36.
ISBN 9783893180738
(doi: 10.5441/002/edbt.2017.04)
Wang, Jing, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
GraphCache: A Caching System for Graph Queries.
In: International Conference on Extending Database Technology (EDBT) 2017, Venice, Italy, 21-24 March 2017,
pp. 13-24.
ISBN 9783893180738
(doi: 10.5441/002/edbt.2017.03)
Wang, Jing, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
Ensuring Consistency in Graph Cache for Graph-Pattern Queries.
In: The 6th International Workshop on Querying Graph Structured Data (GraphQ '17), Venice, Italy, 21-24 Mar 2017,
2016
Wang, Jing, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2016)
Indexing Query Graphs to Speed Up Graph Query Processing.
In: EDBT: 19th International Conference on Extending Database Technology, Bordeaux, France, 15-18 March 2016,
ISBN 9783893180707
(doi: 10.5441/002/edbt.2016.07)
2015
Katsarou, Foteini, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2015)
Performance and scalability of indexed subgraph query processing methods.
Proceedings of the VLDB Endowment, 8(12),
pp. 1566-1577.
Wang, Jing, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2015)
Towards a subgraph/supergraph cached query-graph index.
In: IEEE International Conference on Big Data (IEEE BigData 2015), Santa Clara, CA, USA, 29 Oct - 1 Nov 2015,
2014
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Patlakas, I. and Triantafillou, P.
(2014)
Rank join queries in NoSQL databases.
Proceedings of the VLDB Endowment, 7(7),
pp. 493-504.
2013
Karavarsamis, Sotiris, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948, Blekas, Konstantinos and Pitas, Ioannis
(2013)
Detecting pornographic images by localizing skin ROIs.
International Journal of Digital Crime and Forensics, 5(1),
pp. 39-53.
(doi: 10.4018/jdcf.2013010103)
Sfakianakis, George, Patlakas, Ioannis, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2013)
Interval indexing and querying on key-value cloud stores.
In: 29th IEEE International Conference on Data Engineering (ICDE 2013), Brisbane, Australia, 8-11 Apr 2013,
pp. 805-816.
(doi: 10.1109/ICDE.2013.6544876)
2012
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Patlakas, I., Sfakianakis, G. and Triantafillou, P.
(2012)
Rank Join Queries in Cloud Stores.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Sfakianakis, G., Patlakas, I., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2012)
Interval Indexing and Querying on Key-Value Cloud Stores.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2012)
Saturn: range queries, load balancing and fault tolerance in DHT data systems.
IEEE Transactions on Knowledge and Data Engineering, 24(7),
pp. 1313-1327.
(doi: 10.1109/TKDE.2010.266)
Karavarsamis, S., Pitas, I. and Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948
(2012)
Recognizing pornographic images.
In: The 14th ACM Workshop on Multimedia and Security, Coventry, UK, 6-7 Sep 2012,
pp. 105-108.
(doi: 10.1145/2361407.2361425)
2011
Altanis, A., Patlakas, I., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
Joins and Selects on Clouds.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Patlakas, I. and Triantafillou, P.
(2011)
Decentralized Rank Join Queries.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Sfakianakis, G., Patlakas, I., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
Interval Queries on the Cloud.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Kaidos, C., Pasiopoulos, A., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
SNFS: design and implementation of a social network file system.
In: 4th Workshop on Social Network Systems (SNS '11), Salzburg, Austria, 10 Apr 2011,
Karavarsamis, S., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Blekas, K.
(2011)
InFeRno: an intelligent framework for recognizing pornographic web pages.
In: European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, Athens, Greece, 5-9 Sep 2011,
Koloniari, G., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, E. and Souravlias, D.
(2011)
One is enough: distributed filtering for duplicate elimination.
In: 20th ACM International Conference on Information and Knowledge Management, Glasgow, UK, 24-28 Oct 2011,
Loupasakis, A., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
eXO: decentralized autonomous scalable social networking.
In: 5th Biennial Conference on Innovative Data Systems Research (CIDR 2011), Asilomar, CA, USA, 9-12 Jan 2011,
Weikum, G., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Spaniol, M., Triantafillou, P., Benczur, A., Kirkpatrick, S., Masanes, J. and Williamson, M.
(2011)
Longitudinal analytics on web archive data: it's about time!
In: 5th Biennial Conference on Innovative Data Systems Research (CIDR 2011), Asilomar, CA, USA, 9-12 Jan 2011,
2009
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P. and Weikum, G.
(2009)
Statistical structures for internet-scale data management.
VLDB Journal, 18(6),
pp. 1279-1312.
(doi: 10.1007/s00778-009-0140-7)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P. and Weikum, G.
(2009)
Distributed hash sketches: scalable, efficient, and accurate cardinality estimation for distributed multisets.
ACM Transactions on Computer Systems, 27(1),
Art. 2.
(doi: 10.1145/1482619.1482621)
2006
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2006)
Statistical Structures for Internet-Scale Query Optimization.
Technical Report.
R.A. Computer Technology Institute, Greece.
Aekaterinidis, N., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, T. and Triantafillou, P.
(2006)
Towards efficient complex data management services in peer-to-peer networks.
In: Baldoni, R. (ed.)
Global Data Management.
Series: Emerging communication: studies in new technologies and practices in communication, 8.
IOS Press: Amsterdam, The Netherlands.
ISBN 9781586036294
Michel, S., Bender, M., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P., Weikum, G. and Zimmer, C.
(2006)
Discovering and exploiting keyword and attribute-value co-occurences to improve P2P routing indices.
In: 15th ACM International Conference on Information and Knowledge Management (CIKM 2006), Arlington, VA, USA, 6-11 Nov 2006,
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P. and Weikum, G.
(2006)
Counting at large: Efficient cardinality estimation in internet-scale data networks.
In: 22nd International Conference on Data Engineering (ICDE 2006), Atlanta, GA, USA, 3-8 Apr 2006,
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2006)
Replication, load balancing and efficient range query processing in DHTs.
In: 10th International Conference on Extending Database Technology (EDBT 2006), Munich, Germany, 26-31 Mar 2006,
2005
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, T. and Triantafillou, P.
(2005)
Range query optimization leveraging peer heterogeneity in DHT data networks.
In: 3rd International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P'05), Trondheim, Norway, 28-29 Aug 2005,
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2005)
Replication, load balancing and efficient range query processing in DHTs.
In: 4th Hellenic Data Management Symposium, Athens, Greece, 25-26 Aug 2005,
2004
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, T. and Triantafillou, P.
(2004)
The RangeGuard: Range Query Optimization in Peer-to-Peer Data Networks.
Technical Report.
R.A. Computer Technology Institute, Greece.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
Sizeof() in P2P Networks: Hash Sketches over DHTs.
Technical Report.
R.A. Computer Technology Institute, Greece.
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
HotRoD: Load Balancing and Efficient Range Query Processing in Peer-to-Peer Data Networks.
Technical Report.
R.A. Computer Technology Institute, Greece.
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Yannakopoulos, J.
(2004)
A cache engine for E-content integration.
IEEE Internet Computing, 8(2),
pp. 45-53.
(doi: 10.1109/MIC.2004.1273485)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
AESOP: Altruism-endowed self organizing peers.
In: 2nd International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P'04), Toronto, Canada, 29-30 Aug 2004,
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
SeAl: managing accesses and data in peer-to-peer data sharing networks.
In: 4th IEEE International Conference in Peer-to-Peer Computing (P2P2004), Zurich, Switzerland, 25-27 Aug 2004,
pp. 116-123.
(doi: 10.1109/PTP.2004.1334938)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
SeAl: selfishness and altruism in peer-to-peer data sharing networks.
In: 3rd Hellenic Data Management Symposium, Athens, Greece, 28-29 Jun 2004,
2003
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Nikoletseas, S. and Spirakis, P.
(2003)
NanoPeer networks and P2P worlds.
In: 3rd IEEE International Conference in Peer-to-Peer Computing (P2P2003), Linköping, Sweden, 1-3 Sept 2003,
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Yannakopoulos, J.
(2003)
D.I.C.E. and CO.In.S: a data integration cache engine for a content integration system.
In: 4th International Conference on Web Information Systems Engineering (WISE 2003), Rome, Italy, 10-12 Dec 2003,
pp. 339-342.
(doi: 10.1109/WISE.2003.1254507)
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Yannakopoulos, J.
(2003)
The HyperHotel application built over DICE and COINS.
In: 4th International Conference on Web Information Systems Engineering (WISE 2003), Rome, Italy, 10-12 Dec 2003,
pp. 359-362.
(doi: 10.1109/WISE.2003.1254511)
Triantafillou, P., Xiruhaki, C., Koubarakis, M. and Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948
(2003)
Towards high performance peer-to-peer content and resource sharing systems.
In: Conference on Innovative Data Systems Research (CIDR 2003), Asilomar, CA, USA, 5-8 Jan 2003,
Articles
Paun, Iulia, Moshfeghi, Yashar and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2023)
White-box: on the prediction of collaborative filtering recommendation systems' performance.
ACM Transactions on Internet Technology, 23(1),
8.
(doi: 10.1145/3554979)
Katsarou, Foteini, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2015)
Performance and scalability of indexed subgraph query processing methods.
Proceedings of the VLDB Endowment, 8(12),
pp. 1566-1577.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Patlakas, I. and Triantafillou, P.
(2014)
Rank join queries in NoSQL databases.
Proceedings of the VLDB Endowment, 7(7),
pp. 493-504.
Karavarsamis, Sotiris, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948, Blekas, Konstantinos and Pitas, Ioannis
(2013)
Detecting pornographic images by localizing skin ROIs.
International Journal of Digital Crime and Forensics, 5(1),
pp. 39-53.
(doi: 10.4018/jdcf.2013010103)
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2012)
Saturn: range queries, load balancing and fault tolerance in DHT data systems.
IEEE Transactions on Knowledge and Data Engineering, 24(7),
pp. 1313-1327.
(doi: 10.1109/TKDE.2010.266)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P. and Weikum, G.
(2009)
Statistical structures for internet-scale data management.
VLDB Journal, 18(6),
pp. 1279-1312.
(doi: 10.1007/s00778-009-0140-7)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P. and Weikum, G.
(2009)
Distributed hash sketches: scalable, efficient, and accurate cardinality estimation for distributed multisets.
ACM Transactions on Computer Systems, 27(1),
Art. 2.
(doi: 10.1145/1482619.1482621)
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Yannakopoulos, J.
(2004)
A cache engine for E-content integration.
IEEE Internet Computing, 8(2),
pp. 45-53.
(doi: 10.1109/MIC.2004.1273485)
Book Sections
Aekaterinidis, N., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, T. and Triantafillou, P.
(2006)
Towards efficient complex data management services in peer-to-peer networks.
In: Baldoni, R. (ed.)
Global Data Management.
Series: Emerging communication: studies in new technologies and practices in communication, 8.
IOS Press: Amsterdam, The Netherlands.
ISBN 9781586036294
Research Reports or Papers
Donaldson, Peter ORCID: https://orcid.org/0000-0001-5984-5911, Ntarmos, Nikolaos
ORCID: https://orcid.org/0000-0001-8676-0948 and Portelli, Kurt
(2017)
A Systematic Review of the Potential of Machine Learning and Data Science in Primary and Secondary Education.
Discussion Paper.
Royal Society.
(Unpublished)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Patlakas, I., Sfakianakis, G. and Triantafillou, P.
(2012)
Rank Join Queries in Cloud Stores.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Sfakianakis, G., Patlakas, I., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2012)
Interval Indexing and Querying on Key-Value Cloud Stores.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Altanis, A., Patlakas, I., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
Joins and Selects on Clouds.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Patlakas, I. and Triantafillou, P.
(2011)
Decentralized Rank Join Queries.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Sfakianakis, G., Patlakas, I., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
Interval Queries on the Cloud.
Technical Report.
Longitudinal Analytics of Web Archive Data, Saarbrücken, Germany.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2006)
Statistical Structures for Internet-Scale Query Optimization.
Technical Report.
R.A. Computer Technology Institute, Greece.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, T. and Triantafillou, P.
(2004)
The RangeGuard: Range Query Optimization in Peer-to-Peer Data Networks.
Technical Report.
R.A. Computer Technology Institute, Greece.
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
Sizeof() in P2P Networks: Hash Sketches over DHTs.
Technical Report.
R.A. Computer Technology Institute, Greece.
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
HotRoD: Load Balancing and Efficient Range Query Processing in Peer-to-Peer Data Networks.
Technical Report.
R.A. Computer Technology Institute, Greece.
Conference Proceedings
Al-Anqoudi, Maha, Bikanga Ada, Mireilla ORCID: https://orcid.org/0000-0001-5406-6935, McQuistin, Stephen
ORCID: https://orcid.org/0000-0002-0616-2532, Ntarmos, Nikos
ORCID: https://orcid.org/0000-0001-8676-0948, Parkinson, Jack
ORCID: https://orcid.org/0000-0001-6175-7638 and Moshfeghi, Yashar
(2023)
Traditional Vs Non-Traditional Assessment Activities as Learning Indicators of Student Learning: Teachers’ Perceptions.
In: 2023 IEEE Learning with MOOCS (LWMOOCS), Cambridge, MA, USA, 11-13 Oct 2023,
ISBN 9798350315592
(doi: 10.1109/LWMOOCS58322.2023.10305928)
Paun, Iulia, Moshfeghi, Yashar and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2021)
Are we there yet? Estimating Training Time for Recommendation Systems.
In: EuroMLSys ’21, 26 Apr 2021,
pp. 39-47.
ISBN 9781450382984
(doi: 10.1145/3437984.3458832)
Kyosev, Ivan, Paun, Iulia, Moshfeghi, Yashar and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2020)
Measuring Distances Among Graphs En Route To Graph Clustering.
In: 5th IEEE Workshop on Advances in High-Dimensional Big Data 2020, IEEE Big Data 2020, 10-13 Dec 2020,
pp. 3632-3641.
ISBN 9781728162515
(doi: 10.1109/BigData50022.2020.9378333)
Morgan, Conor, Paun, Iulia and Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948
(2020)
Exploring Contextual Paradigms in Context-Aware Recommendations.
In: 4th IEEE Workshop on Human-in-the-Loop Methods and Future of Work in Big Data 2020, IEEE Big Data 2020, Atlanta, GA, USA, 10-13 Dec 2020,
ISBN 9781728162515
(doi: 10.1109/BigData50022.2020.9377964)
Cahsai, Atoshum, Anagnostopoulos, Christos ORCID: https://orcid.org/0000-0003-1517-6757, Ntarmos, Nikos
ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2019)
Revisiting Exact kNN Query Processing with Probabilistic Data Space Transformations.
In: 2018 IEEE International Conference on Big Data, Seattle, WA, USA, 10-13 Dec 2018,
pp. 653-662.
ISBN 9781538650356
(doi: 10.1109/BigData.2018.8621943)
Wang, Jing, Liu, Zichen, Ma, Shuai, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2018)
GC: A Graph Caching System for Subgraph/Supergraph Queries.
In: 44th International Conference on Very Large Data Bases (VLDB 2018), Rio de Janeiro, Brazil, 27-31 Aug 2018,
pp. 2022-2025.
(doi: 10.14778/3229863.3236250)
Katsarou, Foteini, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2018)
Hybrid Algorithms for Subgraph Pattern Queries in Graph Databases.
In: 2017 IEEE International Conference on Big Data (IEEE BigData 2017), Boston, MA, USA, 11-14 Dec 2017,
pp. 656-665.
ISBN 9781538627150
(doi: 10.1109/BigData.2017.8257981)
Popescu, Iulia, Portelli, Kurt, Anagnostopoulos, Christos ORCID: https://orcid.org/0000-0003-1517-6757 and Ntarmos, Nikolaos
ORCID: https://orcid.org/0000-0001-8676-0948
(2018)
The Case for Graph-Based Recommendations.
In: 2017 IEEE International Conference on Big Data (IEEE BigData 2017), Boston, MA, USA, 11-14 Dec 2017,
pp. 4819-4821.
ISBN 9781538627150
(doi: 10.1109/BigData.2017.8258553)
Cahsai, Atoshum, Anagnostopoulos, Christos ORCID: https://orcid.org/0000-0003-1517-6757, Ntarmos, Nikolaos
ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
Scaling k-Nearest Neighbors Queries (The Right Way).
In: 2017 IEEE 37th International Conference on Distributed Computing Systems (ICDCS), Atlanta, GA, USA, 5-8 June 2017,
pp. 1419-1430.
ISBN 9781538617939
(doi: 10.1109/ICDCS.2017.267)
Katsarou, Foteini, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
Subgraph Querying with Parallel Use of Query Rewritings and Alternative Algorithms.
In: International Conference on Extending Database Technology (EDBT) 2017, Venice, Italy, 21-24 March 2017,
pp. 25-36.
ISBN 9783893180738
(doi: 10.5441/002/edbt.2017.04)
Wang, Jing, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
GraphCache: A Caching System for Graph Queries.
In: International Conference on Extending Database Technology (EDBT) 2017, Venice, Italy, 21-24 March 2017,
pp. 13-24.
ISBN 9783893180738
(doi: 10.5441/002/edbt.2017.03)
Wang, Jing, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2017)
Ensuring Consistency in Graph Cache for Graph-Pattern Queries.
In: The 6th International Workshop on Querying Graph Structured Data (GraphQ '17), Venice, Italy, 21-24 Mar 2017,
Wang, Jing, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2016)
Indexing Query Graphs to Speed Up Graph Query Processing.
In: EDBT: 19th International Conference on Extending Database Technology, Bordeaux, France, 15-18 March 2016,
ISBN 9783893180707
(doi: 10.5441/002/edbt.2016.07)
Wang, Jing, Ntarmos, Nikolaos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2015)
Towards a subgraph/supergraph cached query-graph index.
In: IEEE International Conference on Big Data (IEEE BigData 2015), Santa Clara, CA, USA, 29 Oct - 1 Nov 2015,
Sfakianakis, George, Patlakas, Ioannis, Ntarmos, Nikos ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, Peter
(2013)
Interval indexing and querying on key-value cloud stores.
In: 29th IEEE International Conference on Data Engineering (ICDE 2013), Brisbane, Australia, 8-11 Apr 2013,
pp. 805-816.
(doi: 10.1109/ICDE.2013.6544876)
Karavarsamis, S., Pitas, I. and Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948
(2012)
Recognizing pornographic images.
In: The 14th ACM Workshop on Multimedia and Security, Coventry, UK, 6-7 Sep 2012,
pp. 105-108.
(doi: 10.1145/2361407.2361425)
Kaidos, C., Pasiopoulos, A., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
SNFS: design and implementation of a social network file system.
In: 4th Workshop on Social Network Systems (SNS '11), Salzburg, Austria, 10 Apr 2011,
Karavarsamis, S., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Blekas, K.
(2011)
InFeRno: an intelligent framework for recognizing pornographic web pages.
In: European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, Athens, Greece, 5-9 Sep 2011,
Koloniari, G., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, E. and Souravlias, D.
(2011)
One is enough: distributed filtering for duplicate elimination.
In: 20th ACM International Conference on Information and Knowledge Management, Glasgow, UK, 24-28 Oct 2011,
Loupasakis, A., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2011)
eXO: decentralized autonomous scalable social networking.
In: 5th Biennial Conference on Innovative Data Systems Research (CIDR 2011), Asilomar, CA, USA, 9-12 Jan 2011,
Weikum, G., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Spaniol, M., Triantafillou, P., Benczur, A., Kirkpatrick, S., Masanes, J. and Williamson, M.
(2011)
Longitudinal analytics on web archive data: it's about time!
In: 5th Biennial Conference on Innovative Data Systems Research (CIDR 2011), Asilomar, CA, USA, 9-12 Jan 2011,
Michel, S., Bender, M., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P., Weikum, G. and Zimmer, C.
(2006)
Discovering and exploiting keyword and attribute-value co-occurences to improve P2P routing indices.
In: 15th ACM International Conference on Information and Knowledge Management (CIKM 2006), Arlington, VA, USA, 6-11 Nov 2006,
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Triantafillou, P. and Weikum, G.
(2006)
Counting at large: Efficient cardinality estimation in internet-scale data networks.
In: 22nd International Conference on Data Engineering (ICDE 2006), Atlanta, GA, USA, 3-8 Apr 2006,
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2006)
Replication, load balancing and efficient range query processing in DHTs.
In: 10th International Conference on Extending Database Technology (EDBT 2006), Munich, Germany, 26-31 Mar 2006,
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Pitoura, T. and Triantafillou, P.
(2005)
Range query optimization leveraging peer heterogeneity in DHT data networks.
In: 3rd International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P'05), Trondheim, Norway, 28-29 Aug 2005,
Pitoura, T., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2005)
Replication, load balancing and efficient range query processing in DHTs.
In: 4th Hellenic Data Management Symposium, Athens, Greece, 25-26 Aug 2005,
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
AESOP: Altruism-endowed self organizing peers.
In: 2nd International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P'04), Toronto, Canada, 29-30 Aug 2004,
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
SeAl: managing accesses and data in peer-to-peer data sharing networks.
In: 4th IEEE International Conference in Peer-to-Peer Computing (P2P2004), Zurich, Switzerland, 25-27 Aug 2004,
pp. 116-123.
(doi: 10.1109/PTP.2004.1334938)
Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Triantafillou, P.
(2004)
SeAl: selfishness and altruism in peer-to-peer data sharing networks.
In: 3rd Hellenic Data Management Symposium, Athens, Greece, 28-29 Jun 2004,
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948, Nikoletseas, S. and Spirakis, P.
(2003)
NanoPeer networks and P2P worlds.
In: 3rd IEEE International Conference in Peer-to-Peer Computing (P2P2003), Linköping, Sweden, 1-3 Sept 2003,
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Yannakopoulos, J.
(2003)
D.I.C.E. and CO.In.S: a data integration cache engine for a content integration system.
In: 4th International Conference on Web Information Systems Engineering (WISE 2003), Rome, Italy, 10-12 Dec 2003,
pp. 339-342.
(doi: 10.1109/WISE.2003.1254507)
Triantafillou, P., Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948 and Yannakopoulos, J.
(2003)
The HyperHotel application built over DICE and COINS.
In: 4th International Conference on Web Information Systems Engineering (WISE 2003), Rome, Italy, 10-12 Dec 2003,
pp. 359-362.
(doi: 10.1109/WISE.2003.1254511)
Triantafillou, P., Xiruhaki, C., Koubarakis, M. and Ntarmos, N. ORCID: https://orcid.org/0000-0001-8676-0948
(2003)
Towards high performance peer-to-peer content and resource sharing systems.
In: Conference on Innovative Data Systems Research (CIDR 2003), Asilomar, CA, USA, 5-8 Jan 2003,