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Research Interests:
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Distributed Computer Systems.
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Peer-to-Peer Systems.
- Auditing/Accounting.
- Complex Query Processing and Optimization.
- Load Balancing.
- Routing Overlays.
- Security.
- Ubiquitous Computing Devices as Peers.
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Internet Content Integration & Dissemination.
- Mediators / Wrappers.
- Query Result Caching (Active / Semantic Caching).
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[DBLP] [entry].
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Journal Publications:
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S. Karavarsamis, N. Ntarmos, K. Blekas, and I. Pitas.
"Detecting Pornographic Images by Localizing Skin ROIs."
International Journal of Digital Crime and Forensics (IJDCF),
Volume 5, Number 1, September 2013.
[N/A]
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T. Pitoura, N. Ntarmos, and P. Triantafillou.
"Saturn: Range Queries, Load Balancing and Fault Tolerance in DHT Data
Systems."
Transactions on Knowledge and Data Engineering (TKDE),
Volume 24, Number 7, July 2012 (accepted: 23 December 2010).
[N/A]
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N. Ntarmos, P. Triantafillou, and G. Weikum.
"Statistical Structures for Internet-Scale Data Management."
VLDB Journal (VLDBJ),
Volume 18, Number 6, December 2009.
[N/A]
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N. Ntarmos, P. Triantafillou, and G. Weikum.
"Distributed Hash Sketches: Scalable, Efficient, and Accurate
Cardinality Estimation for Distributed Multisets."
ACM Transactions on Computer Systems (TOCS),
Volume 27, Issue 1, February 2009.
[N/A]
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P. Triantafillou, N. Ntarmos, and J. Yannakopoulos.
"D.I.C.E.: A Cache Engine for e-Content Integration."
IEEE Internet Computing,
March/April 2004.
[pdf]
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Conference Publications:
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G. Sfakianakis, I. Patlakas, N. Ntarmos, and P. Triantafillou,
"Interval Indexing and Querying on Key-Value Cloud Stores."
Proceedings of the 29th IEEE International Conference on Data Engineering (ICDE),
April 2013 (to appear). [N/A]
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S. Karavarsamis, I. Pitas, and N. Ntarmos,
"Recognizing Pornographic Images."
Proceedings of the 14th ACM Workshop on Multimedia and Security (MMSec),
September 2012. [N/A]
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G. Koloniari, N. Ntarmos, E. Pitoura, and D. Souravlias,
"One is Enough: Distributed Filtering for Duplicate Elimination"
Proceedings of the 20th ACM Conference on Information and Knowledge
Management (CIKM),
October 2011. [N/A]
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S. Karavarsamis, N. Ntarmos, and K. Blekas,
"InFeRno: An Intelligent Framework for Recognizing Pornographic Web
Pages."
Proceedings of the European Conference on Machine Learning and
Principles and Practice of Knowledge Discovery in Databases (ECML-PKDD) -- demo paper,
September 2011. [N/A]
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C. Kaidos, A. Pasiopoulos, N. Ntarmos, and P. Triantafillou,
"Design and Implementation of the Social Network File System."
Proceedings of the 4th Workshop on Social Network Systems (SNS),
April 2011. [N/A]
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G. Weikum, N. Ntarmos, M. Spaniol, P. Triantafillou, A. Benczur, S.
Kirkpatrick, J. Masanes, and M. Williamson.
"Longitudinal Analytics on Web Archive Data: It's About Time!"
Proceedings of the 5th Biennial Conference on Innovative Data Systems
Research (CIDR),
January 2011. [N/A]
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A. Loupasakis, N. Ntarmos, and P. Triantafillou.
"eXO: Decentralized Autonomous Scalable Social Networking."
Proceedings of the 5th Biennial Conference on Innovative Data Systems
Research (CIDR),
January 2011. [N/A]
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M. Bender, S. Michel, N. Ntarmos, P. Triantafillou, G. Weikum, and C.
Zimmer.
"Discovering and Exploiting Keyword and Attribute-Value Co-occurrences
to Improve P2P Routing Indices."
Proceedings of the 15th ACM Conference on Information and Knowledge
Management (CIKM),
November 2006. (Best Interdisciplinary Paper Award)
[pdf] (*)
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N. Ntarmos, P. Triantafillou, and G. Weikum.
"Counting at large: Efficient cardinality estimation in Internet-scale
data networks."
Proceedings of the 22nd International Conference on Data Engineering
(ICDE),
April 2006.
[pdf] (*)
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T. Pitoura, N. Ntarmos, and P. Triantafillou.
"Replication, Load Balancing, and Efficient Range Query processing in
DHT Data Networks."
Proceedings of the 10th International Conference on Extending Database
Technology (EDBT),
March 2006.
[pdf] (*)
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N. Ntarmos, T. Pitoura, and P. Triantafillou.
"Range query optimization leveraging peer heterogeneity in DHT data
networks."
Proceedings of the 3rd International Workshop on Databases,
Information Systems, and Peer-to-Peer Computing (DBISP2P),
August 2005.
[pdf] (*)
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N. Ntarmos and P. Triantafillou.
"AESOP: Altruism-Endowed Self-Organizing Peers."
Proceedings of the 2nd International Workshop on Databases,
Information Systems, and Peer-to-Peer Computing (DBISP2P),
August 2004.
[pdf] (*)
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N. Ntarmos and P. Triantafillou.
"SeAl: Managing Accesses and Data in Peer-to-Peer Sharing
Networks."
Proceedings of the 4th IEEE International Conference on
Peer-to-Peer Computing (P2P),
August 2004.
[pdf] (*)
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P. Triantafillou, N. Ntarmos, and J. Yannakopoulos.
"D.I.C.E. and Co.In.S.: A Data Integration Cache Engine for a
Content Integration System."
Proceedings of the 4th IEEE International Conference on Web
Information Systems Engineering (WISE) -- short paper,
December 2003.
[pdf]
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P. Triantafillou, N. Ntarmos, and J. Yannakopoulos.
"The HyperHotel Application Built over D.I.C.E. and Co.In.S."
Proceedings of the 4th IEEE International Conference on Web
Information Systems Engineering (WISE) -- demo paper,
December 2003.
[pdf]
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P. Triantafillou, N. Ntarmos, S. Nikoletseas, and P. Spirakis.
"Nanopeer Networks and Peer-to-Peer Worlds."
Proceedings of the 3rd IEEE International Conference on
Peer-to-Peer Computing (P2P),
September 2003.
[pdf]
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P. Triantafillou, C. Xiruhaki, M. Koubarakis, and N. Ntarmos.
"Towards High Performance Peer-to-Peer Content and Resource
Sharing Systems."
In Proceedings of the 1st ACM SIGMOD/VLDB Conference on
Innovative Data Systems Research (CIDR),
January 2003.
[pdf]
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Informal Conference Publications:
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N. Ntarmos and G. Weikum.
"Distributed Hash Sketches: Estimating the Cardinality of
Large Multisets in Internet-Scale Data Networks."
Proceedings of the 5th Hellenic Data Management Symposium
(HDMS),
September 2006.
[N/A] (*)
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T. Pitoura, N. Ntarmos, and P. Triantafillou.
"Replication, Load Balancing, and Efficient Range Query Processing in
DHTs."
Proceedings of the 4th Hellenic Data Management Symposium
(HDMS),
August 2005.
[N/A] (*)
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N. Ntarmos and P. Triantafillou.
"SeAl: Managing Accesses and Data in Peer-to-Peer Sharing
Networks."
Proceedings of the 3rd Hellenic Data Management Symposium (HDMS),
June 2004.
[N/A] (*)
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P. Triantafillou, N. Ntarmos, and T. Pitoura.
"The RangeGuard: Range Query Optimization in Peer-to-Peer Data
Networks."
Proceedings of the 3rd Hellenic Data Management Symposium (HDMS),
June 2004.
[N/A] (*)
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Technical Reports:
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G. Sfakianakis, I. Patlakas, N. Ntarmos, and P. Triantafillou.
"Interval Indexing and Querying on Key-Value Cloud Stores."
TR WP3-7-21.09.2012, Longitudinal Analytics of Web Archive Data (LAWA) Project,
September 2012.
[N/A]
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N. Ntarmos, I. Patlakas, G. Sfakianakis, and P. Triantafillou.
"Rank Join Queries in Cloud Stores."
TR WP3-6-21.09.2012, Longitudinal Analytics of Web Archive Data (LAWA) Project,
September 2012.
[N/A]
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A. Altanis, I. Patlakas, N. Ntarmos, and P. Triantafillou.
"Joins and Selects on Clouds."
TR WP3-3-22.09.2011, Longitudinal Analytics of Web Archive Data (LAWA) Project,
September 2011.
[N/A]
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G. Sfakianakis, I. Patlakas, N. Ntarmos, and P. Triantafillou.
"Interval Queries on the Cloud."
TR WP3-2-22.09.2011, Longitudinal Analytics of Web Archive Data (LAWA) Project,
September 2011.
[N/A]
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N. Ntarmos, I. Patlakas, and P. Triantafillou.
"Decentralized Rank Join Queries."
TR WP3-1-22.09.2011, Longitudinal Analytics of Web Archive Data (LAWA) Project,
September 2011.
[N/A]
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N. Ntarmos and P. Triantafillou.
"Statistical Structures for Internet-Scale Query Optimization."
TR 2006/06/01, R.A. Computer Technology Institute,
June 2006.
[N/A]
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N. Ntarmos and P. Triantafillou.
"sizeof() in P2P Networks: Hash Sketches over DHTs."
TR 2004/12/06, R.A. Computer Technology Institute,
December 2004.
[N/A]
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T. Pitoura, N. Ntarmos, and P. Triantafillou.
"HotRoD: Load Balancing and Efficient Range Query Processing in
Peer-to-Peer Data Networks."
TR 2004/12/05, R.A. Computer Technology Institute,
December 2004.
[N/A]
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N. Ntarmos, T. Pitoura, and P. Triantafillou.
"The RangeGuard: Range Query Optimization in Peer-to-Peer Data
Networks."
TR 2004/12/04, R.A. Computer Technology Institute,
December 2004.
[N/A]
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Book Chapters:
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I. Aekaterinidis, N. Ntarmos, T. Pitoura, and P. Triantafillou.
"Towards Efficient Complex Data Management Services in Peer-to-Peer
Networks."
R. Baldoni, G. Cortese, and F. Davide, editors,
Global Data Management,
volume 8 of Emerging Communication: Studies in New Technologies and
Practices in Communication.
IOS Press,
July 2006.
[N/A]
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Theses/Dissertations:
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N. Ntarmos.
"Development and Utilization of Novel Systems for Auditing, Accounting,
and Computing of Global Characteristics and Properties of the Entities in
Peer-to-Peer Networks."
PhD Thesis, Dept. of Computer Engineering & Informatics,
University of Patras, Greece,
February 2008.
[N/A] (*)
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N. Ntarmos.
"A Behavior Monitoring and Auditing System for Peer-to-Peer
Networks."
MEng Thesis, Dept. of Computer Engineering & Informatics,
University of Patras, Greece,
May 2004.
[pdf]
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N. Ntarmos.
"An Internet Content Integration System: The Mediator and
Wrappers."
Diploma Thesis, Dept. of Electronic & Computer Engineering,
Technical University of Crete, Greece,
April 2002.
[pdf]
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Research Projects:
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LAWA: Longitudinal Analytics of Web Archive Data,
ICT-2009.1.6,
2010.
[link]
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Inno-Utilities: Innovation-friendly Public Procurement and Fight
Against Telecommunications Fraud and Security Threads,
IPS-2001-42014,
2005.
[link]
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DELIS: Dynamically Evolving Large-scale Information Systems,
IST-2002-001907,
2004.
[link]
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DBGlobe: A Data-centric approach to Globale Computing,
IST-2001-32645,
2002 - 2003.
[link]
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DIET: Decentralized Information Ecosystem Technologies,
IST-1999-10088,
2002 - 2003.
[link]
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CRESCCO: Critical Resource Sharing for Cooperation in Complex
Systems,
IST-2001-33135,
2002.
[link]
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FLAGS: Foundational Aspects of Global Computing Systems,
IST-2001-33116,
2002.
[link]
(*) This work was co-financed by E.U.-European Social Fund (75%) and the Greek
Ministry of Development-GSRT (25%).
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