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 research primarily focuses 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

  • Information Retrieval

  • Web Mining

  • 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 and Information Retrieval' as well as the opportunities in the area of 'Collaborative Search'.

    news

    Full Research Paper Accepted at ACM SIGIR'18, Ann Arbor, Michigan, USA.

    Predicting User Knowledge Gain in Informational Search Sessions


    Full Research Paper Accepted at ACM HT'18, Baltimore, Maryland, USA.

    SimilarHITs: Revealing the Role of Task Similarity in Microtask Crowdsourcing


    Full Research Paper Accepted at ACM CHIIR'18, New Brunswick, New Jersey, USA.

    Analyzing Knowledge Gain of Users in Informational Search Sessions on the Web


    Journal Paper Accepted at ACM IWMUT (Interactive, Mobile, Wearable and Ubiquitous Technologies); Presented at UBICOMP'17

    Modus Operandi of Crowd Workers : The Invisible Role of Microtask Work Environments


    Journal Paper Accepted at ACM TOCHI (Transactions on Computer-Human Interaction)

    Using Worker Self-Assessments for Competence-based Pre-selection in Crowdsourcing Microtasks




    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.


    Selected Works



    CHI 2015 chi2015 Understanding Malicious Behavior in Crowdsourcing Platforms: The Case of Online Surveys


    WebSci 2015 websci2015 Ranking Buildings and Mining the Web for Popular Architectural Patterns


    HT 2014 ht2014 A Taxonomy of Microtasks on the Web




    Tutorials and Lectures



    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