Ujwal Gadiraju

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Ujwal Gadiraju

Postdoctoral Researcher at L3S Research Center

Current Affiliation: L3S Research Center.
Leibniz Universität Hannover, Germany
Address: L3S Research Center, Appelstraße 4a, Hannover.
Phone: +49 0511 762 5772
Fax: +49 0511 762 19712
Email: gadiraju (at) L3S (dot) de

[Google Scholar] [DBLP]

Research Interests


My current research primarily lies at the intersection of HCI and IR. In the recent past my work has focused on leveraging human intelligence to solve problems that go beyond the capability of machines. You can find my PUBLICATIONS LIST here. I am broadly interested in:

  • Crowdsourcing

  • Human Computation

  • Human-Computer Interaction

  • Information Retrieval

  • Social Computing

    • Although I am constantly interested in the fields of Human Computation and Crowdsourcing, at the moment I am actively working on 'Understanding Human Factors in Web Search'. In the imminent future, I plan to explore the current challenges in 'Conversational Search' as well as the opportunities in the area of 'Collaborative Search'.

    news

    Full Research Paper Accepted at ACM WSDM 2020, Houston, Texas, USA.

    Crowd Worker Strategies in Relevance Judgment Tasks


    IEEE TKDE Journal Paper Accepted for Next Issue.

    The Impact of Task Abandonment in Crowdsourcing


    Full Research Paper Accepted at ACM CSCW 2019, Austin, Texas, USA.

    Dissonance Between Human and Machine Understanding


    Full Research Paper Accepted at ACM HT 2019, Hof, Germany.

    Understanding Worker Moods and Reactions to Rejection in Crowdsourcing


    Full Research Paper Accepted at ACM HT 2019, Hof, Germany.

    Understanding User Search Behavior Across Varying Cognitive Levels


    'Outstanding PC Member' recognition at ACM UMAP 2019 for consistently high quality reviews.


    Short Research Paper Accepted at SIGIR 2019, Paris, France.

    Revealing the Role of User Moods in Struggling Search Tasks


    Full Research Paper Accepted at ACM WebSci 2019, Boston, USA.

    In What Mood Are You Today? An Analysis of Crowd Workers' Mood, Performance and Engagement


    Full Research Paper Accepted at ACM UMAP'19, Larnaca, Cyprus.

    Chatterbox: Conversational Interfaces for Microtask Crowdsourcing


    Full Research Paper Accepted at ACM CHI'19, Glasgow, Scotland.

    Understanding and Mitigating Worker Biases in the Crowdsourced Collection of Subjective Judgments


    Brief CV


    2017-Present Postdoctoral Researcher
    L3S Research Center, Leibniz Universität Hannover, Germany.
    2013-2017 Ph.D Candidate
    L3S Research Center, Leibniz Universität Hannover, Germany.
    2011-2012 Master of Science in Computer Science
    Delft University of Technology (TU Delft), Delft, The Netherlands.
    2006-2010 Bachelor of Technology in Computer Science and Engineering
    Vellore Institute of Technology University, Vellore, Tamil Nadu, India.




    Lectures and Tutorials


    2020

    Foundations of Human Computation & Crowdsourcing
    Leibniz University of Hannover, Hannover, Germany.
    Course Link

    2019

    BINF4237 Social Computing
    University of Zurich, Zurich, Switzerland.
    Course Link
    Foundations of Human Computation & Crowdsourcing
    Leibniz University of Hannover, Hannover, Germany.
    Course Link

    2016

    May 22nd, 2016 WebSci'16 - It's Getting Crowded! How to Use Crowdsourcing Effectively for Web Science Research
    Hannover, Germany.
    Tutorial Slides
    May 17th, 2016 ICWSM'16 - How to Use Crowdsourcing Effectively for Social Media Research
    Cologne, Germany.
    Tutorial Slides
    April 26th, 2016 Web Science Sommersemester'16
    L3S Research Center, Leibniz Universität Hannover, Germany.
    Slide Deck

    News & Press Reports


    March 7th, 2017 WWW 2017 Outstanding Reviewer Award
    L3S News
    October 13th, 2016 Crowdsource Solutions to Big Problems
    Interview with Gail Carmichael, Shopify
    October 17th, 2016 Studying Abroad
    Interview with Daniel Gross