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

Extractive Query-Focused Multi-Document Summarization
Haggai Roitman, Guy Feigenblat, Odellia Boni, David Konopnicki

Systems and Methods for Query Performance Prediction using Reference Lists
Haggai Roitman

Relevance Model for Session Search
Haggai Roitman, Doron Cohen, Nir Levine


2016

Minimum Coordination Passage Scoring
Haggai Roitman, Doron Cohen, Oren Sar-Shalom

Mutual Reinforcement of Collaborative Filtering and Sentiment Analysis
Oren Sar-Shalom, Haggai Roitman

Multi-Field Search Query Ranking Using Scoring Statistics
Haggai Roitman, Doron Cohen

Enhancing Robustness Of Pseudo-Relevance Feedback Models Using Query Drift Minimization
Haggai Roitman, Roy Levin, Artem Barger

Efficiently Committing Large Transactions In a Graph Database
Roy Levin, Haggai Roitman


2015

Unsupervised Boosting of Unique Searcher Answers in a Metasearch (Fusion) Setting
Haggai Roitman, Doron Cohen

Determining a Query Answer Selection
Haggai Roitman, Doron Cohen

Generic Term Weighting based on Query Performance Prediction
Haggai Roitman, Ella Rabinovich

Query Performance Prediction using a What-If Analysis Approach
Haggai Roitman, Ella Rabinovich, Shay Hummel

Stability Score based Re-ranking of Search Results
Haggai Roitman, Ella Rabinovich, Shay Hummel, Shai Erera


2014

Fusion of Cluster Labeling Algorithms by Analyzing Sub-clusters
Haggai Roitman, Shay Hummel, Michal Shmueli-Scheuer

Large Taxonomy Categorization
Michal Shmueli-Scheuer, Dafna Sheinwald, David Konopnicki, Doron Cohen, Oded Margalit, Gadi Aleksandrowicz, Haggai Roitman

Quanti fication-based Classifi er
Roy Levin, Haggai Roitman

Identifying Influencers in Computer Networks
Haggai Roitman, Jonathan Herzig, Yosi Mass

Predicting Knowledge Gaps of Media Consumers
Haggai Roitman, Mattias Marder, Gal Ashour

Dataset Classi cation Quanti cation
Roy Levin, Haggai Roitman, Anat Hashavit


2013

GUI-Based Authentication for a Computing System
Gilad Barkai, Haggai Roitman

Printing Quality Determination based on Text Analysis
Haggai Roitman, Ariel Raviv, Gilad Barkai, Shai Erera

Content Recommendation Based on Uniqueness of Individuals in Targeted Audience
Haggai Roitman, Yosi Mass, David Carmel, Iris Eiron


2012

Medical Monitoring Rule Recommendation
Haggai Roitman, HeonKyu Park, YooJin Kwon

Access Control for Entity Search
Haggai Roitman, Sivan Yogev

Visualization of User Sentiment for Product Features
Haggai Roitman, Yosi Mass

Indexing and Searching Entity-Relationship Data
Sivan Yogev, Haggai Roitman, David Carmel


2011

Automatic Word Cloud Generation
David Carmel, Erel Uziel, Ido Guy, Yosi Mass, Haggai Roitman

Personalized Medical Content Recommendation
Haggai Roitman, Yossi Mesika, Yonathan Maman

Faceted Search with Relationships Between Categories
Sivan Yogev, Haggai Roitman, David Carmel

Sentiment Estimation of Web Browsing User
Haggai Roitman, David Konopmicki, Michal Shmueli-Scheuer, Benjamin Sznajder

Autotagging Business Processes
Haggai Roitman, Yossi Messika

Topic based Calendar Availability
Haggai Roitman, Yossi Mesika


2010

Visualization of Social Medical Data
Haggai Roitman, Yossi Mesika, Yevgenia Tsimerman

Dynamic Generation of Products for Online Recommendation
Haggai Roitman, Nadav Har'El, Michal Shmueli-Scheuer, Gilad Barkai

Popularity Prediction of User-Generated Content
David Carmel, Haggai Roitman, Elad Yom-Tov

Measuring Web Site Satisfaction Of Information Needs
Haggai Roitman, David Konopnicki, David Carmel, Gilad Barkai