Haggai Roitman  Haggai Roitman photo       

contact information

Lead Researcher & Master Inventor - Information Retrieval
IBM Research AI, Haifa, Israel
  +972dash4dash829dash6395

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Professional Associations

Professional Associations:  ACM SIGIR


2017

SummIt: A Tool for Extractive Summarization, Discovery and Analysis
G. Feigenblat, O. Boni, H. Roitman, D. Konopnicki
(to appear) International Conference on Information and Knowledge Management (CIKM), 2017

Session Search in Apache Solr
H. Roitman, D. Cohen, S. Erera, N. Levine
SIGIR'2017 Workshop on Lucene for Information Access and Retrieval Research

Enhanced Mean Retrieval Score Estimation for Query Performance Prediction
H. Roitman, S. Erera, O. Sar-Shalom, B. Weiner
ACM SIGIR International Conference on Theory of Information Retrieval, 2017

A User Re-Modeling Approach to Item Recommendation using Complex Usage Data
O. Sar-Shalom, H. Roitman, Y. Mansour, A. Amir
ACM SIGIR International Conference on Theory of Information Retrieval, 2017

Robust Standard Deviation Estimation for Query Performance Prediction
H. Roitman, S. Erera, B. Weiner
ACM SIGIR International Conference on Theory of Information Retrieval, 2017

Enhanced Probabilistic Classify and Count Methods for Multi-Label Text Quantification
R. Levin, H. Roitman
ACM SIGIR International Conference on Theory of Information Retrieval, 2017

Unsupervised Query-Focused Multi-Document Summarization using the Cross Entropy Method
G. Feigenblat, H.Roitman, O. Boni and D. Konopnicki
ACM Special Interest Group on Information Retrieval (SIGIR), 2017

An Enhanced Approach to Query Performance Prediction Using Reference Lists
H. Roitman
ACM Special Interest Group on Information Retrieval (SIGIR), 2017

An Extended Relevance Model for Session Search
N.Levine, H. Roitman, D. Cohen
ACM Special Interest Group on Information Retrieval (SIGIR), 2017


2016

RecSys'16 Workshop on Deep Learning for Recommender Systems (DLRS)
A. Karatzoglou, B. Hidasi, D. Tikk, O. Sar-Shalom, H. Roitman, B. Shapira
RecSys, 2016

From "More Like This" to "Better Than This"
H. Roitman, D. Cohen, S. Hummel
The 2nd ACM International Conference on the Theory of Information Retrieval (ICTIR), [Search], 2016

From Diversity-based Prediction to Better Ontology & Schema Matching
A. Gal, H. Roitman, T. Sagi
World Wide Web conference (WWW), Schema Matching, 2016

On the Retrieval of Wikipedia Articles Containing Claims on Controversial Topics
H.Roitman, S. Hummel, E. Rabinovich, B. Sznajder, N. Slonim. E. Aharoni
Wiki Workshop @ WWW, [Search], 2016

When Watson Went to Work - Leveraging Cognitive Computing in the Real World
A. Soffer, D. Konopnicki, H. Roitman
ACM Special Interest Group on Information Retrieval (SIGIR), 2016


2014

Understanding Customer Behavior Using Indoor Location Analysis and Visualization
A. Yaeli, P. Bak, G. Feigenblat, S. Nadler, H. Roitman, G. Saadoun, H. J. Ship, D. Cohen, O. Fuchs, S. Ofek-Koifman, T. Sandbank
IBM Journal of Research and Development, User modeling, 2014

An Author-Reader Influence Model for Detecting Topic-based Influencers in Social Media
J. Herzig, Y. Mass, H. Roitman
ACM Hypertext, [Social Media], 2014

A Fusion Approach to Cluster Labeling
H. Roitman, S. Hummel, M. Shmueli-Scheuer
ACM Special Interest Group on Information Retrieval (SIGIR), [Content Analysis, Clustering], 2014

Using the Cross-Entropy Method to Re-Rank Search Results
H. Roitman, S. Hummel, O. Kurland
ACM Special Interest Group on Information Retrieval (SIGIR), [Search], 2014

Measuring the Effectiveness of Multi-Channel Marketing Campaigns Using Online Chatter
H. Roitman, G. Barkai, D. Konopnicki, A. Soffer
World Wide Web conference (WWW), [Crowd Sensing, Social Media], 2014

Harnessing the Crowds for Multi-Channel Marketing Monitoring
H. Roitman, G. Barkai, D. Konopnicki, M.Shmueli-Scheuer
Big Data Consumer Analytics (BDCA) workshop @ICDE, [Crowd Sensing, Social Media], 2014

Microcosm: Visual Discovery, Exploration and Analysis of Social Communities
H. Roitman, A.Raviv, S.Erera, S. Hummel, D. Konopnicki,
International Conference On Intelligent User Interfaces (IUI ), pp. 5--8, [Social Media], 2014


2013

A statistical approach to mining customers' conversational data from social media
Konopnicki, D.Shmueli-Scheuer, M. ; Cohen, D. ; Sznajder, B. ; Herzig, J. ; Raviv, A. ; Zwerling, N., Roitman, H., Mass, Y.
IBM Journal of Research and Development, [User Modeling, Social Media], 2013

Modeling the uniqueness of user preferences for recommendation systems
Haggai Roitman, David Carmel, Yosi Mass, Iris Eiron
ACM Special Interest Group on Information Retrieval (SIGIR), [User Modeling, Recommender Systems], 2013

Towards Discovery-Oriented Patient Similarity Search
Haggai Roitman, Sivan Yogev, Yevgenia Tsimerman and Yardena Peres
Health Search and Discovery (HSD) workshop (@SIGIR), [Social-Medical Discovery], 2013


2012

The First Joint International Workshop on Entity-oriented and Semantic Search (JIWES)
K. Balog, D. Carmel, A. P. de Vries, D. M. Herzig, P. Mika, H. Roitman, R. Schenkel, P. Serdyukov, and T. Tran
SIGIR Forum, 46(2), December 2012., [Entity Oriented Search]

Greaaaat bargains starting from just 99p!!!! :-) : Brand Perception in the Social Media
Michal Shnueli-Scheuer, Benjamine Sznajder, Doron Cohen, Ariel Raviv, David Konopnicki, Haggai Roitman
First int. Workshop on Multimodal Crowd-Sensing (CrowdSens), [Social Media], 2012

Harnessing the crowds for smart city sensing
Haggai Roitman, Jonathan Mamou, Sameep Mehta, Aharon Satt, LV Subramaniam
Proceedings of the 1st international workshop on Multimodal crowd sensing, pp. 17--18, [Crowd Sensing, Social Media], 2012

Workshop on Multimodal Crowd Sensing (CrowdSens 2012)
Haggai Roitman, Ivan Cantador, Miriam Fernandez
21st ACM International Conference on Information and Knowledge (CIKM), [Crowd Sensing], 2012

Bridging the Gaps Towards Advanced Data Discovery over Semi-Structured Data
Sivan Yogev, Haggai Roitman
Proceedings of the 31st International Conference on Conceptual Modeling (ER), [Entity Oriented Search], 2012

Towards Expressive Exploratory Search Over Entity-Relationship Data
Sivan Yogev, Haggai Roitman, David Carmel, Naama Zwerdling
World Wide Web conference (WWW), [Entity Oriented Search], 2012

Surfacing Time-critical Insights from Social Media
B. Alexe, M. A. Hernandez, K. W. Hildrum, R. Krishnamurthy, G. Koutrika, M. Nagarajan, H. Roitman, M. Shmueli-Scheuer,
ACM SIGMOD, pp. 657--660, [Social Media], 2012

Folksonomy-Based Term Extraction for Word Cloud Generation
David Carmel, Ido Guy, Erel Uziel, Yosi Mass, Haggai Roitman
ACM Transactions on Intelligent Systems and Technology (TIST), Special Issue on Computational Models of Collective Intelligence in the Social Web , [Text Mining, Social Media], 2012

On the Relationship Between Novelty and Popularity of User-Generated Content
David Carmel, Haggai Roitman, Elad Yom-Tov
ACM Transactions on Intelligent Systems and Technology (TIST), Special Issue on Search and Mining User Generated Contents, [User Modeling, Social Media], 2012

On the Support of Flexible Patient Privacy Policies in Social-Medical Discovery
Haggai Roitman, Sivan Yogev, Yevgenia Tsimerman, Yardena Peres
24th International Conference of the European Federation for Medical Informatics (MIE) , [Social-Medial Discovery, Privacy], 2012


2011

Search and Mining Entity-Relationship Data
Haggai Roitman, Ralf Schenkel, Marko Grobelnik
20th ACM International Conference on Information and Knowledge (CIKM), [Entity Oriented Search], 2011

An Authorization Model for Entity Search
Haggai Roitman, Sivan Yogev
1st Int. Workshop on Search and Mining Entity-Relationship Data (SMER), [Entity Oriented Search, Privacy], 2011

Exploratory Search Over Social-Medical Data
Haggai Roitman, Sivan Yogev, Yevgenia Tsimerman, Dae Won Kim, Yossi Messika
20th ACM International Conference on Information and Knowledge (CIKM), [Social-Medical Discovery], 2011

Folksonomy-Based Term Extraction for Word Cloud Generation
David Carmel, Ido Guy, Erel Uziel, Yosi Mass, Haggai Roitman
20th ACM Conference on Information and Knowledge Management (CIKM), pp. 2437--2440, [Text Mining, Social Media], 2011

A Unified Approach for Social-Medical Discovery
Haggai Roitman, Yossi Mesika, Yevgenia Tsimerman, Sivan Yogev
23rd International Conference of the European Federation for Medical Informatics (MIE), [Social-Medical Discovery], 2011

Using Pharmacogenetics Knowledge to Increase Accuracy of Alerts for Adverse Drug Events
Yossi Mesika, Byung-Chul Lee, Yengenia Tsimerman, Haggai Roitman, Heon-Kyu Park
23rd International Conference of the European Federation for Medical Informatics (MIE), [Medical Informatics], 2011

A Dual Framework and Algorithms for Targeted Data Delivery
Haggai Roitman, Avigdor Gal, Louiqa Raschid
IEEE Transactions on Knowledge and Data Engineering, [Online Data Delivery], 2011


2010

Increasing Patient Safety using Explanation-Driven Personalized Content Recommendation
Haggai Roitman, Yossi Mesika, Yevgenia Tsimerman, Yonatan Maman
1st ACM International Conference on Health Informatics (IHI'10), [Social-Medical Discovery, Recommender Systems], 2010

On the Relationship Between Novelty and Popularity of User-Generated Content
David Carmel, Haggai Roitman, Elad Yom-Tov
19th ACM Conference on Information and Knowledge Management (CIKM), [User Modeling, Social Media], 2010

Social Bookmark Weighting for Search and Recommendation
David Carmel, Haggai Roitman, Elad Yom-Tov
VLDB Journal , Content Analysis, Social Media, Recommender Systems, 2010

On Trade-offs in Event Delivery Systems
Haggai Roitman, Avigdor Gal, Louiqa Raschid
The 4th ACM International Conference on Distributed Event-Based Systems (DEBS), [Online Data Delivery], 2010

Extracting User Profiles from Large Scale Data
Michal Shmueli-Scheuer, Haggai Roitman, David Carmel, Yosi Mass, David Konopnicki
MDAC 2010 : International Workshop on Massive Data Analytics over the Cloud, [User Modeling, BigData]


2009

Web Monitoring 2.0 - Crossing Streams to Satisfy Complex Data Needs
Haggai Roitman, Avigdor Gal, Louiqa Raschid
25th IEEE International Conference on Data Engineering (ICDE), [Online Data Delivery, Web Monitoring], 2009

Best Effort Top-K Query Processing Under Budgetary Constraints
M. Shmueli-Scheuer, Chen Li, Yosi Mass, Haggai Roitman, Ralf Schenkel, Gerhard Weikum
25th IEEE International Conference on Data Engineering (ICDE), [Query Processing], 2009

A service delivery platform for server management services
J Lenchner, D Rosu, NF Velasquez, S Guo, K Christiance, D DeFelice, PM Deshpande, K Kummamuru, N Kraus, LZ Luan, others
IBM Journal of Research and Development 53(6), 2--1, [Services], 2009

Enhancing Cluster Labeling Using Wikipedia
David Carmel, Haggai Roitman, Naama Zwerdling
29th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, pp. 139--146, [Content Analysis, Clustering], 2009

Who Tags the Tags? A Framework for Bookmark Weighting
David Carmel, Haggai Roitman, Elad Yom-Tov
18th ACM Conference on Information and Knowledge Management (CIKM), [Content Analysis, Social Media], 2009


2008

Satisfying Complex Data Needs using Pull-Based Online Monitoring of Volatile Data Sources
Haggai Roitman, Avigdor Gal, Louiqa Raschid
24th IEEE International Conference on Data Engineering (ICDE), [Online Data Delivery, Web Monitoring], 2008

Capturing Approximated Data Delivery Trade-offs
Haggai Roitman, Avigdor Gal, Louiqa Raschid
24th IEEE International Conference on Data Engineering (ICDE), [Online Data Delivery], 2008

Enhancing Digital Libraries Using Missing Content Analysis
David Carmel, Elad Yom-Tov, Haggai Roitman
Joint Conference on Digital Libraries (JCDL) , [Content Analysis, Digital Libraries], 2008

On the Challenges in Event Delivery
Haggai Roitman, Avigdor Gal, Louiqa Raschid
2nd International Conference on Distributed Event-Based Systems (DEBS), [Online Data Delivery], 2008

Maintaining Dynamic Channel Profiles on the Web
Haggai Roitman, David Carmel, Elad Yom-Tov
34th International Conference on Very Large Data Bases (VLDB), [Content Analysis, Web Monitoring, Streams], 2008

Providing Top-K Alternative Schema Matchings with OntoMatcher
Haggai Roitman, Avigdor Gal, Carmel Domshlak
27th International Conference on Conceptual Modelling (ER 2008), [Schema Matching]


2007

Rank Aggregation for Automatic Schema Matching
Carmel Domshlak, Avigdor Gal, Haggai Roitman
IEEE Transactions on Knowledge and Data Engineering 19(4), [Schema Matching], 2007


2006

Framework and Algorithms for Web Resource Monitoring and Data Delivery
Haggai Roitman, Avigdor Gal, Louiqa Raschid
Technical Report CS-TR-4806, UMIACS-TR- 2006-26, University of Maryland, College Park, 2006, [Online Data Delivery, Web Monitoring]

OntoBuilder: Fully Automatic Extraction and Consolidation of Ontologies from Web Sources using Sequence Semantics
Haggai Roitman, Avigdor Gal
EDBT 2006 Workshops, Semantics of sequence and time dependent data, [Schema Matching]

Profile Based Online Data Delivery
Haggai Roitman
3rd OTM Academy Doctoral Consortium, [Online Data Delivery], 2006

Profile Based Online Data Delivery
Haggai Roitman, Avigdor Gal, Louiqa Raschid
VLDB 2006 Ph.D. Workshop, [Online Data Delivery]

ProMo - A Scalable and Efficient Framework for Online Data Delivery
Haggai Roitman, Avigdor Gal, Louiqa Raschid
NGITS '06 - Int. workshop on Next Generation Information Technologies and Systems, [Online Data Delivery], 2006