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Michael O'Mahony

Lecturer

School Of Computer Science & Informatics
Science Centre - East
Belfield
Dublin 4

Tel: +353 1 7162644
Email: michael.omahony@ucd.ie

Biography

Michael received his Ph.D. in Computer Science from University College Dublin in 2005. Subsequently, he was employed as a Postdoctoral Fellow in the UCD School of Computer Science and Informatics Information and has been a Lecturer in the School since 2012.

Michael's recent research has focused on the areas of recommender systems, reputation systems, social Web search, real-time Web and user-generated content analysis. This work has included developing reputation models to enhance information discovery on the Web, leveraging real-time Web data as a new source of recommendation knowledge, and applying machine learning techniques and opinion mining to inform product and review recommendation. Previous work considered the robustness of collaborative recommender systems against attack. Michael¿s seminal work in this area has been widely cited and has lead to significant research activity by the community on this topic.

Michael has published over 60 peer-reviewed papers in his areas of expertise. Michael is a Funded Investigator in the Insight Centre for Data Analytics and a PI in the Learnovate Technology Centre. To date, Michael has secured EUR 400K in research funding.

Publications

 

Book Chapters

O'Mahony, M.P., Cunningham, P., Smyth, B.,; (2010) 'An Assessment of Machine Learning Techniques for Review Recommendation' In: Coyle, L, and Freyne, J (eds). Lecture Notes in Computer Science, Volume 6206 (AICS 2009). Berlin: Springer. , pp.241-250 Available Online [DOI] [Details]
Burke, R. and O'Mahony, M.P. and Hurley, N.; (2011) 'Robust Collaborative Recommendation' In: Ricci, F.; Rokach, L.; Shapira, B.; Kantor, P.B (eds). Recommender Systems Handbook. New York: Springer. , pp.805-833 [Details]
 

Peer Reviewed Journals

O'Mahony M.P., Hurley N.J., and Silvestre G.C.M; (2003) 'Collaborative filtering - safe and sound?'. Lecture Notes in Computer Science, 2871 :506-510. [Details]
O'Mahony M.P., Hurley N.J., and Silvestre C.C.M.,; (2004) 'An evaluation of neighbourhood formation on the performance of collaborative filterin'. Artificial Intelligence Review, (Special Issue). [Details]
O'Mahony, M.P. and Smyth, B.; (2010) 'A classification-based review recommender'. Knowledge Based Systems, . [Details]
K. McNally, M. P. Oâ¿¿Mahony and B. Smyth (2014) 'A Comparative Study of Collaboration-based Reputation Models for Social Recommender Systems'. User Modeling and User-Adapted Interaction: The Journal of Personalization Research (UMUAI), 24 number=3 (3):219-260. [Details]
O'Mahony, Michael P. and Smyth, Barry; (2007) 'Collaborative web search: a robustness analysis'. Artificial Intelligence Review, 28 (1):69-86. [Details]
O'Mahony, M., Hurley, N., Kushmerick, N. & Silvestre, G.; (2004) 'Collaborative Recommendation: A Robustness Analysis'. Acm Transactions on Internet Technology, 4 (4):344-377. [Details]
Hurley, N. J. and O'Mahony, M. and Silvestre, G.C.M.; (2007) 'Attacking Recommender Systems: A Cost-Benefit Analysis'. IEEE Intelligent Sysyems, 22 (3):64-68. [Details]
 

Conference Publications

O'Mahony M. P., Hurley N. J. and Silvestre G.C.M. (2002). in; (2002) Towards Robust Collaborative Filtering Proc. of 13th Irish Conference on Artificial Intelligence & Cognitive Science, AICS02, Sept. 12-13, Limerick, Ireland, 2002 Limerick, Ireland, , 12-SEP-02 - 13-SEP-02 [Details]
O'Mahony M. P., Hurley N. J. and Silvestre G.C.M.; (2002) Promoting Recommendations: An Attack on Collaborative Filtering Proc. of 13th International Conference on Database and Expert Systems Applications, DEXA02, Aix-en-Provence, France, 2002 Aix-en-Provence, , 02-SEP-02 - 06-SEP-02 [Details]
O'Mahony M.P., Hurley N.J., and Silvestre G.C.M.,; (2002) Promoting recommendations: An attack on collaborative filtering In Proc. of the 13th International Conference on Database and Expert Systems Applications (DEXA'02), pp. 494-503, Aix-en-Provence, France, September 2-6 (2002) Aix-en-Provence, France, , 02-SEP-02 - 06-SEP-02 , pp.494-503 [Details]
O'Mahony M.P., Hurley N.J. and Silvestre G.C.M. (2003).; (2003) Collaborative Filtering: safe and Sound? Proc. of 14th International Symposium on Methodologies for Intelligent Systems, Maebashi TERRSA, Maebashi City, Japan, 2003 Maebashi TERRSA, Maebashi City, Japan, [Details]
O'Mahony M.P., Hurley N.J. and Silvestre G.C.M. (2003).; (2003) An Evaluation of the Performance of Memory-Based Collaborative Filtering Proc. of 14th Irish Conference on Artificial Intelligence & Cognitive Science, AICS03, Dublin, Ireland, 2003 Dublin, [Details]
O'Mahony M.P., Hurley N.J., and Silvestre G.C.M.,; (2004) Utility-based neighbourhood formation for efficient and robust collaborative filtering In Proc. of the ACM Conference on Electronic Commerce (EC'04), ACM, New York, USA, May 17-20 (2004) New York, USA, , 17-MAY-04 - 20-MAY-04 [Details]
O Mahony, M., Hurley, N.J. Silvestre, G.C.M.; (2005) Detecting noise in recommender system databases Proceedings of the 2006 International Conference on Intelligent User Interfaces [Details]
O Mahony, M., Hurley, N.J. Silvestre, G.C.M.; (2006) Attacking recommender systems ' the cost of promotion Proceedings of the ECAI 2006 Workshop on Recommender Systems [Details]
O Mahony, M., Hurley, N.J. Silvestre, G.C.M.; (2006) Detecting noise in recommender system databases in Proceedings of the 2006 International Conference on Intelligent User Interfaces [Details]
O' Mahony, M. and Smyth, B.; (2007) A Recommender System for On-line Course Enrolment: An Initial Study ACM Conference on Recommender Systems Minneapolis, MN, USA, , 19-OCT-07 - 20-OCT-07 , pp.133-136 [Details]
O'Mahony, M.P. and Smyth, B. ; (2007) A Recommender System for On-line Course Enrolment: An Initial Study . In: ACM Press eds. Proceedings of Recommender Systems Minneapolis, Minnesota, USA, [Details]
Smyth, B.; Briggs, P.; Coyle, M.; O¿Mahony, M.P. ; (2009) A Case-Based Perspective on Social Web Search Proceedings of the 8th International Conference on Case-Based Reasoning (ICCBR 2009) [Details]
Smyth, B. and Briggs, P. and Coyle, M. and O'Mahony, M.P.; (2009) A Case-Based Perspective on Social Web Search International Conference on Case-Based Reasoning (ICCBR) [Details]
O'Mahony, M.P. and Smyth, B.; (2009) Learning to Recommend Helpful Hotels Reviews ACM International Conference on Recommender Systems (RecSys) [Details]
Rafter, R.; O'Mahony, M.P.; Hurley, N.J.; Smyth, B; (2009) What Have the NeighboursEverDone for us? A Collaborative Filtering Perspective First International Conference on User Modeling, Adaptation and Personalization (UMAP 09) [Details]
Smyth, B.; Coyle, M.; Briggs, P.; O'Mahony, M.P. ; (2009) Google Shared! A Case-Study in Social Search UMAP - International Conference on User Modeling and Adaptive Personalization [Details]
KcNally, K. and O'Mahony, M.P. and Smyth, B. and Coyle, M. and Briggs, P.; (2010) Towards a reputation-based model of social web search ACM International Conference on Intelligent User Interfaces (IUI) [Details]
O'Mahony M.P. and Smyth, B.; (2010) Using Readability Tests to Predict Helpful Product Reviews International Conference on Adaptability, Personalization and Fusion of Heterogeneous Information [Details]
Esparaza, S.G. and O'Mahony, M.P. and Smyth, B.; (2010) Effective Product Recommendation using the Real-Time Web SGAI International Conference on Artificial Intelligence (AI) [Details]
O'Mahony, M.P. and Cunningham, P. and Smyth, B.; (2010) Predicting Helpful Product Reviews Irish Conference on Artificial Intelligence and Cognitive Science [Details]
Esparaza, S.G. and O'Mahony, M.P. and Smyth, B.; (2010) Towards Tagging and Categorization for Micro-blogs Irish Conference on Artificial Intelligence and Cognitive Science (AICS) [Details]
Esparaza, S.G. and O'Mahony, M. P. and Smyth, B. ; (2010) On the Real-Time Web as a Source of Recommendation Knowledge ACM International Conference on Recommender Systems (RecSys) [Details]
O'Mahony, M.P. and Smyth, B.; (2010) The Readability of Helpful Product Reviews International FLAIRS Conference [Details]
Dong, R.; McCarthy, K.; O¿Mahony, M.; Schaal, M.; Smyth, B. (2012) Towards an intelligent reviewer's assistant: recommending topics to help users to write better product reviews ACM international conference on Intelligent User Interfaces (IUI '12) [DOI] Link to full text [Details]
R. Dong, M. P. O'Mahony, M. Schaal, K. McCarthy and B. Smyth (2013) Sentimental Product Recommendation In Proceedings of the 7th ACM Recommender System Conference (RecSys) , pp.411-414 [Details]
R. Dong, M. Schaal, M. P. O'Mahony and B. Smyth (2013) Mining Experiential Product Cases In the Workshop on Case-based Reasoning in Social Web Applications, 21st International Conference on Case-Based Reasoning [Details]
R. Dong, M. Schaal, M. P. O'Mahony, K. McCarthy and B. Smyth (2013) Opinionated Product Recommendation In Proceedings of the 21st International Conference on Case-Based Reasoning (ICCBR) , pp.44-58 [Details]
R. Dong, M. Schaal, M. P. O'Mahony, K. McCarthy and B. Smyth (2013) Mining Features and Sentiment from Review Experiences In Proceedings of the 21st International Conference on Case-Based Reasoning (ICCBR) , pp.59-73 [Details]
R. Dong, M. Schaal, M. P. O'Mahony and B. Smyth (2013) Topic Extraction from Online Reviews for Classification and Recommendation In Proceedings of the 23rd International Joint Conference on Artificial Intelligence (IJCAI) , pp.1310-1316 [Details]
K. McNally, M. P. O'Mahony and B. Smyth (2013) A Model of Collaboration-based Reputation for the Social Web In Proceedings of the Seventh International AAAI Conference on Weblogs and Social Media (ICWSM) , pp.705-708 [Details]
S. Garcia Esparza, M. P. O'Mahony and B. Smyth (2013) CatStream: Categorising Tweets for User Profiling and Stream Filtering In Proceedings of the 2013 International Conference on Intelligent User Interfaces (IUI) , pp.25-36 [Details]
S. Bourke, M. P. O'Mahony, R. Rafter and B. Smyth (2013) Ranking In Information Streams In Proceedings of the Companion Publication of the 2013 International Conference on Intelligent User Interfaces (IUI Companion) , pp.99-100 [Details]
Humberto Jesus Corona Pampin, Michael P. O'Mahony (2014) A Mood-based Genre Classification of Television Content Workshop on Recommender Systems for Television and Online Video (RecSysTV 2014), 8th ACM Conference on Recommender Systems (RecSys 2014) address=Foster City, Silicon Valley, USA Foster City, Silicon Valley, USA, [Details]
Ruihai Dong, Michael P. O'Mahony and Barry Smyth (2014) Further Experiments in Opinionated Product Recommendation In Proceedings of the 22nd International Conference on Case-Based Reasoning (ICCBR 2014) Cork, Ireland, [Details]
Humberto Jesus Corona Pampin, Houssem Jerbi, and Michael P. O'Mahony (2014) Evaluating the Relative Performance of Neighbourhood-Based Recommender Systems In Proceedings of the 3rd Spanish Conference on Information Retrieval A Coruña, Spain, [Details]
Guo, X.; Jerbi, H.; O'Mahony, M. P. (2014) An Analysis Framework for Content-based Job Recommendation International Conference on Case-Based Reasoning (ICCBR 2014) [Details]
Gunjan, K.; Jerbi, H.; Gurrin, C.; O'Mahony, M. P. (2014) Towards Activity Recommendation from Lifelogs International Conference on Information Integration and Web-based Applications & Services (iiWAS2014) Hanoi, Vietnam, , 04-DEC-14 - 06-DEC-14 [Details]
Smyth, Barry and Briggs, Peter and Coyle, Maurice and O'Mahony, Michael P.; (2009) Google? Shared! A Case-Study in Social Search User Modeling, Adaptation and Personalization (UMAP 2009) Trento, Italy, , pp.283-294 [Details]
O'Mahony, Michael P. and Smyth, Barry; (2009) A Classification-based Review Recommender Twenty-ninth SGAI International Conference on Artificial Intelligence (AI-2009) Cambridge, England, [Details]
O'Mahony, Michael P. and Smyth, Barry; (2009) Learning to Recommend Helpful Hotel Reviews 3rd ACM Conference on Recommender Systems (RecSys 2009) New York City, NY, USA, [Details]
Rafter, Rachael and O'Mahony, Michael P. and Hurley, N. and Smyth, Barry; (2009) What Have The Neighbours Ever Done For Us? A Collaborative Filtering Perspective User Modeling, Adaptation and Personalization (UMAP 2009) Trento, Italy, , pp.355-360 [Details]
Smyth, Barry and Briggs, Peter and Coyle, Maurice and O'Mahony, Michael P; (2009) A Case-Based Perspective on Social Web Search 8th International Conference on Case-Based Reasoning: Case-Based Reasoning Research and Development (ICCBR 2009) Seattle, WA, USA, , pp.494-508 [Details]
O'Mahony, M.P. and O'Brien, M. and Boydell, O. and Smyth, B.; (2008) A Recommender System Approach to Enhance Web Search and Query Formulation 19th Irish Conference on Artificial Intelligence and Cognitive Science (AICS'08) Cork, Ireland, , 27-AUG-08 - 29-AUG-08 , pp.143-153 [Details]
Bryan, K., O'Mahony, M.P., Cunningham, P., ; (2008) Unsupervised retrieval of attack profiles in collaborative recommender systems . In: P. Pu, D. G. Bridge, B. Mobasher, F. Ricci eds. 2nd ACM International Conference on Recommender Systems (RecSys2008) Lausanne, Switzerland, , pp.155-162 Available Online [DOI] [Details]
O'Mahony, M.P. and Smyth, B.; (2007) Evaluating the Robustness of Collaborative Web Search Proceedings of the 18th irish Conference on Artificial Intelligence and Cognitive Science Dublin, Ireland, [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2006) Attacking Recommender Systems: The Cost of Promotion Workshop on Recommender Systems, in conjunction with the 17th European Conference on Artificial Intelligence Riva del Garda. Italy, , 28-AUG-06 - 29-AUG-06 [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2006) Recommender Systems: Attack Types and Strategies 20th National Conference in Artificial Intelligence (AAAI'05) Pittsburgh, Pennsylvania, USA, , 09-JUL-05 - 12-JUL-05 , pp.334-339 [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2006) Detecting Noise in Recommender System Databases International Conference on Intelligent User Interfaces Sydney, Australia, , 29-JAN-06 - 01-FEB-06 , pp.109-115 [Details]
O'Mahony, MP, Hurley, NJ, Silvestre, GCM, ; (2004) ARTIFICIAL INTELLIGENCE REVIEW An evaluation of neighbourhood formation on the performance of collaborative filtering , pp.215-228 [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2004) Efficient and Secure Collaborative Filtering through Intelligent Neighbour Selection 16th European Conference on Artificial Intelligence (ECAI'04) Valencia, Spain, , 23-AUG-04 - 27-AUG-04 , pp.383-387 [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2004) Utility-Based Neighbourhood Formation for Efficient and Robust Collaborative Filtering 5th ACM Conference on Electronic Commerce New York, New York, USA, , 17-MAY-04 - 20-MAY-04 , pp.260-261 [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2003) An Evaluation of the Performance of Collaborative Filtering 14th Irish Conference on Artificial Intelligence and Cognitive Science (AICS'03) Dublin, Ireland, , 17-SEP-03 - 19-SEP-03 , pp.164-168 [Details]
O'Mahony, MP, Hurley, NJ, Silvestre, GCM, ; (2003) FOUNDATIONS OF INTELLIGENT SYSTEMS Collaborative filtering - Safe and sound? , pp.506-510 [Details]
O'Mahony, M.P., Hurley, N.J. and Silvestre, G.C.M.; (2002) Promoting Recommendations: An Attack on Collaborative Filtering 13th International Conference on Database and Expert Systems Applications (DEXA'02) Aix-en-Provence, France, , 02-SEP-02 - 06-SEP-02 , pp.494-503 [Details]
O'Mahony, MP, Hurley, NJ, Silvestre, GCM, ; (2002) ARTIFICIAL INTELLIGENCE AND COGNITIVE SCIENCE, PROCEEDINGS Towards robust collaborative filtering , pp.87-94 [Details]
                                                                                         

Research

Research Interests

Recommender Systems, Reputation Systems, Web Search, Machine Learning, Opinion Mining and Data Analytics.