Dr Nikos Ntarmos

Honorary Senior Research Fellow (School of Computing Science)

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

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Number of items: 52.

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,

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