Hemant Purohit

Hemant Purohit

Computational Social Scientist at Kno.e.sis - Ohio Center of Excellence in Knowledge-enabled Computing

Dayton, Ohio Area

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Hemant Purohit's Overview


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Hemant Purohit's Summary

Inter-disciplinary researcher & PhD candidate with philosophy of Computational Social Science.

a.) Understand human social dynamics (coordination, engagement, and influence) in the online communities using Web Mining, Psycholinguistics, People-Content-Network analysis & knowledge/semantics-enhanced computing,
b.) Transform R&D from the labs into practice, for social impact #Tech4SocialGood

Researcher at Ohio Center of Excellence in Knowledge-enabled Computing (Kno.e.sis); Research intern at IBM Research, Microsoft Research and QCRI; Extensive experience with Web 3.0 R&D Projects for research design, management and data analytics.

Hemant Purohit's Experience

Educational Institution; 51-200 employees; Computer Software industry

September 2009Present (5 years 2 months)

Researcher in the space of Social Media Analytics. Working on problems of community #engagement and #sustainability, #coordination in #evolving-communities-- especially #emergency-response with #BigData deluge, information and #influence spreads, etc. using technologies of #Semantic-Web and #Knowledge-enhanced-Computing for #Big-Data

Nonprofit; 51-200 employees; Research industry

January 2013May 2013 (5 months) Doha, Qatar

#Coordination, #Crisis-Informatics, #Emergency-Response, #BigData . Machine-learning approach to automatically match demands & supplies for assisting coordination of resource donations and needs during crisis (Check publication: Emergency–relief coordination on social media: Automatically matching resource requests and offers [First Monday journal, 2014-- the highlight of January issue])

Research Intern

Microsoft Research

Public Company; 10,001+ employees; MSFT; Computer Software industry

June 2012August 2012 (3 months) Silicon Valley (MSV)

Novel approaches to model expertise and interest presentation on Social Media (Check publication: User Taglines: Alternative Presentations of Expertise and Interest in Social Media [ASE Social-Informatics 2012, Acceptance-Rate: 11.5%])

Research Intern

IBM Research

Public Company; 10,001+ employees; IBM; Information Technology and Services industry

June 2011August 2011 (3 months)

Worked with Human Language Technologies (HLT) group for 'finding users to engage wtih' in the evolving social media communities (Check publication: Finding Influential Authors in Brand-Page Communities [ICWSM-2012, Acceptance-rate-26%])

Undergrad Intl Research Intern

Kno.e.sis Center

Educational Institution; 51-200 employees; Computer Software industry

May 2008August 2008 (4 months) Dayton, Ohio Area

Rule-based framework to support ontological reasoning in the knowledge base for Semantic Sensor Web project (http://knoesis.wright.edu/research/semsci/application_domain/sem_sensor) at Kno.e.sis

Undergrad Research Intern

Indian Institute of Technology, Kanpur

Educational Institution; 1001-5000 employees; Higher Education industry

May 2007July 2007 (3 months) Kanpur Area, India

In Communication Engineering, worked on optimization of the RFID Tag antenna design framework and a new Tag antenna design (check publication: Performance Analysis of RFID Tag Antennas ( International Journal on Wireless and Optical Communications (IJWOC) 2008))

Electronics Lab Assistant


Educational Institution; 11-50 employees; Higher Education industry

July 2006April 2007 (10 months) Jaipur Area, India

Assisting students for lab experimentation and course projects in Electronics and Communication Design

Hemant Purohit's Volunteer Experience & Causes

  • Volunteer Experience

    • Research Support for Mining Gender-based Violence from Social Media

      UNFPA and Kno.e.sis
      • Social Services
      January 2014 present (10 months)

      In collaboration with subject matter experts at UNFPA, we are analyzing social media data to understand its role in assisting policy design recommendations for curbing gender violence across the world.

    • Research Support for Overcoming Information Overload of Heatlh-related SMSs

      UNICEF, QCRI and Kno.e.sis
      • Health
      June 2014 present (5 months)

      In collaboration with QCRI team, we are helping UNICEF automatically categorize health issues related SMS data, for improving their timely response efforts.

    • Tech and Data Support during Philippines Typhoon

      CrisisMappers Volunteers, StandBy Task Force, QCRI and Kno.e.sis
      • Disaster and Humanitarian Relief
      November 2013 November 2013 (1 month)

      During Yolanda/Haiyan (Philippines) Typhoon response, provided computing and data filtering support for MicroMappers platform with my mentor Patrick Meier's social-innovation team at QCRI and SBTF for UN OCHA; as also cited by several media outlets (WSJ, etc.) on our efforts: results- http://irevolution.net/2013/11/13/early-results-micromappers-yolanda/

    • Crisis Map Coordinator during Phailin Typhoon

      CrisisMappers Volunteers
      • Disaster and Humanitarian Relief
      October 2013 October 2013 (1 month)

      Coordinated a global group of volunteers (including members of SBTF, OpenCrisis, Info4Disasters, HumanityRoad, etc.) in collaboration with Google Crisis Response team for creating Crisis-Map to aid response (http://google.org/crisismap/a/gmail.com/2013-phailin-cyclone);
      as also cited by several news outlets on our effort such as, Times Of India, DNA, Business Standard, etc., e.g., http://www.dnaindia.com/scitech/report-google-s-person-finder-and-google-crisis-response-map-for-phailin-to-help-with-crisis-information-1902500

    • Crisis Map Coordinator during Uttarakhand Flash Floods

      CrisisMappers Volunteers
      • Disaster and Humanitarian Relief
      June 2013 June 2013 (1 month)

      Coordinated a team of global digital volunteers, including members from orgs like SBTF, Info4, OpenCrisis, HOT, CrisisMappersUK, and a surge support from the Humanity Road in collaboration with Google Crisis Response team for creating Crisis-Map to aid response (http://google.org/crisismap/2013-uttrakhand-floods?gl=in);
      as also cited by The Hindu newspaper on our effort: www.thehindu.com/sci-tech/technology/gadgets/using-crisis-mapping-to-aid-uttarakhand/article4854027.ece

    • Tech Analyst during Oklahoma Tornado Response

      CrisisMappers Volunteers
      • Disaster and Humanitarian Relief
      May 2013 May 2013 (1 month)

      Analyzed the twitter feeds for important resource needs and offers related messages, and shared with response organizations. Results: http://irevolution.net/2013/05/29/analyzing-tweets-tornado/ --- The results were also cited in this infographic report: https://www.mediabistro.com/alltwitter/social-media-impact-natural-disasters_b56426

  • Volunteer Interests

    • Causes I care about:

      • Disaster and Humanitarian Relief
      • Education
      • Environment
      • Health
      • Human Rights
      • Science and Technology
    • Organizations I support:

      • United Nations
      • United Nations Population Fund (UNFPA)
      • International Committee of the Red Cross - ICRC
      • UNICEF

Hemant Purohit's Honors and Awards

  • ITU Telecom World 2014 Young Innovator

    ITU - UN's ICT agency
    • August 2014

    Winner of ITU Telecom World 2014's Young Innovator Competition on Open Source Technologies for Disaster Management, based on the idea emanating from PhD research, among 150 ideas worldwide. https://ideas.itu.int/blog#blog/post/60076

  • Fellow at ICCM-2013, UN Nairobi

    USAID, Google, ICT4Peace Foundation and CrisisMappers Network
    • November 2013

    Among 8 international fellows of ICCM-2013 at UN Nairobi, organized by the largest humanitarian technology network-- CrisisMappers.net and sponsored by USAID, Google and ICT4Peace Foundation

  • Outstanding Student Award

    CSE Department, Wright State University
    • April 2014

    Based on accomplishments in research and impact of professional and volunteering activities beyond academia

  • Tutorial Speaker at the AAAI conference, ICWSM-2013

    • July 2013

    Tutorial on how to leverage social media analytics for assisting crisis response coordination, with Drs. Carlos Castillo, Patrick Meier, and Prof. Amit Sheth:

  • Tutorial Speaker at the SIAM conference, SDM-2014

    • April 2014

    Tutorial on how to leverage social media analytics and web of knowledge for assisting crisis response coordination, with Drs. Carlos Castillo, and Fernando Diaz:

  • Invited Speaker at NCSU workshop on IT for Sustainable Micro-entrepreneurship Development

    • May 2014

    Gave talk on 'Coordinating Social Media driven Marketplace for Tourism' based on application of my PhD research on leveraging social media communities to assist coordination, and improving crisis response.

  • Student travel fellowship at the ACM conference, WebSci-2014

    ACM SIGWEB, WebSci
    • June 2014
  • Student travel fellowship at the SIAM conference, SDM-2014

    • April 2014
  • Student travel fellowship at the AAAI conference, ICWSM-2014

    • May 2014
  • Student travel fellowship at the AAAI conference, ICWSM-2013

    • July 2013
  • Professional Development Grant Recipient 2012

    Graduate School Assembly, Wright State University
    • November 2012

Hemant Purohit's Courses

  • PhD, Computer Science & Engineering

    Wright State University

    • Data Mining
    • Machine Learning
    • Semantic Web
    • Knowledge Representation for Semantic Web
    • Information Retrieval
    • Cloud Computing
    • Database Systems and Design
    • Pattern Recognition
    • Web Information Systems
    • Communication in Science
    • Social Psychology
  • B.Tech., Communication & Computer Engineering


    • Data Structures and Algorithms
    • Database Management Systems
    • Computer Vision
    • Computer Networks
    • Computer Architecture and Evolution
    • Mobile Communication
    • Digital Communication
    • Analog Communication
    • Semiconductor and Devices
    • Digital Signal Processing
    • Engineering Mathematics
    • Engineering Physics

Hemant Purohit's Languages

  • English

  • Hindi

Hemant Purohit's Skills & Expertise

  1. Semantic Web
  2. Machine Learning
  3. Java
  4. Python
  5. MySQL
  6. Natural Language Processing
  7. Text Mining
  8. Data Mining
  9. Algorithms
  10. Semantic Technologies
  11. PHP
  12. Information Extraction
  13. Information Retrieval
  14. JSP
  15. XML
  16. JSON
  17. JavaScript
  18. Linux
  19. Social Network Analysis
  20. Computer Science
  21. OWL
  22. Linked Data
  23. Knowledge Representation
  24. Apache
  25. C#
  26. Big Data
  27. RDF
  28. SPARQL
  29. Artificial Intelligence
  30. Computational Linguistics
  31. NLP
  32. Matl
  33. Web Mining

View All (33) Skills View Fewer Skills

Hemant Purohit's Projects

  • SoCS: Social Media Enhanced Organizational Sensemaking in Emergency Response

    • September 2011 to Present

    Online social networks and always-connected mobile devices have empowered citizens and organizations to communicate and coordinate effectively in the wake of critical events. Specifically, there have been many examples of using Twitter to provide timely and situational information about emergencies to relief organizations, and to conduct ad-hoc coordination. This NSF sponsored multidisciplinary research involving Computer Scientists and Cognitive Scientists at Wright State University and Ohio State University seeks to understand the full ramifications of using social networks in a more concerted manner for effective organizational sensemaking in such contexts.

    This project is expected to have a significant impact in the specific context of disaster and emergency response. However, elements of this research are expected to have much wider utility, for example in the domains of e-commerce, and social reform. From a computational perspective, this project introduces the novel paradigm of spatio-temporal-thematic (STT) and people-content-network analysis (PCNA) of social media and traditional media content, implemented as part of Twitris (http://twitris.knoesis.org). Applications of STT and PCNA extend well beyond organized sensemaking. For social scientists, it provides a platform that can be used to assess relative efficacy of various organizational structures and is expected to provide new insights into the types of social network structures (mix of symmetric and asymmetric) that might be better suitable to propagate information in emergent situations. From an educational standpoint, the majority of funds will be used to train the next generation of interdisciplinary researchers drawn from the computational and social sciences.

    Keywords: Social Networking, Emergency Response, People-Content-Network Analysis (PCNA), Spatio-Temporal-Thematic Analysis (STT Analysis), Organizational Sensemaking, Collaborative Decision Making.

  • Twitris+: 360 degree Social Media Analytics platform

    • November 2009 to Present

    Users are sharing voluminous social data (800M+ active Facebook users, 1B+ tweets/week) through social networking platforms accessible by Web and increasingly via mobile devices. This gives unprecedented opportunity to decision makers-- from corporate analysts to coordinators during emergencies, to answer questions or take actions related to a broad variety of activities and situations: who should they really engage with, how to prioritize posts for actions in the voluminous data stream, what are the needs and who are the resource providers in emergency event, how is corporate brand performing, and does the customer support adequately serve the needs while managing corporate reputation etc. We demonstrate these capabilities using Twitris+ by multi-faceted anlaysis along dimensions of Spatio-Temporal-Thematic, People-Content-Network and Subjectivity-Emotion-Sentiment.

Hemant Purohit's Publications

  • How to Leverage Social Media Communities for Crisis Response Coordination

    • CrisisMappers, ICCM-13 at UN Nairobi
    • November 2013

    Ignite talk at ICCM-2013 at United Nations (UN) Nairobi. Key-message: We need to extract smart actionable data out of big crisis data to assist response coordination, by focusing on demand-supply centric technology (Video- http://goo.gl/nNOO28 , Slides- http://goo.gl/Q732ay ) [HIGHLIGHT: 8000+ slide views within a week]

    More at Kno.e.sis' SOCS project page: http://knoesis.org/research/semsoc/projects/socs
    Also, Crisis Informatics at Kno.e.sis: http://j.mp/CrisisRes

  • Leveraging Social Media and Web of Data for assisting Crisis Response Coordination

    • SIAM, SDM-2014 Tutorials
    • 2014

    Data mining can provide valuable insights to support emergency responders and other stakeholders during crisis. However, there are a number of challenges and existing computing technology may not work in all cases. Therefore, our objective in this tutorial is to present the characterization of such data mining tasks, and challenges that need further research attention.

  • Crisis Mapping, Citizen Sensing and Social Media Analytics: Leveraging Citizen Roles for Crisis Response

    • AAAI, ICWSM-2013 Tutorials
    • July 11, 2013

    This tutorial weaves three themes and corresponding relevant topics- a.) citizen sensing and crisis mapping, b.) technical challenges and recent research for leveraging citizen sensing to improve crisis response coordination, and c.) experiences in building robust and scalable platforms/systems. It couples technical insights with real world examples.

  • Emergency–relief coordination on social media: Automatically matching resource requests and offers

    • First Monday Journal, UIC library
    • January 6, 2014

    Machine–learning methods to automatically identify and match needs and offers during disaster response, communicated via social media for items and services such as shelter, money, clothing, volunteering, etc. [HIGHLIGHT: chosen as the lead paper of January issue of the journal]

  • What Kind of #Communication is Twitter? Mining #Psycholinguistic Cues for Emergency Coordination

    • Computers in Human Behavior (CHB) Journal, Elsevier
    • November 2013

    Information filtering model to reduce Twitter traffic for disaster coordination, by modeling coordination via pyscholinguistic theories of conversations. Also, a proof for existence of similar human behavior of face-to-face communication in online communication [HIGHLIGHT: chosen in CDC's Health Communication Science digest of October]

  • On Understanding Divergence of Online Social Group Discussion

    • AAAI, ICWSM-14
    • 2014

    Unlike prior studies with focus on link structures to characterize social group dynamics, we model content-based group dynamics by understanding collective discussion divergence; with guidance from two socio-psychological theories, social cohesion and social identity. [HIGHLIGHT: Acceptance-rate: 23%]

  • Identifying Seekers and Suppliers in Social Media Communities to Support Crisis Coordination

    • Journal of CSCW, Springer
    • 2014

    Model for filtering information by using psycholinguistics theories to identify tacit cooperation in the declarations of resource needs and availability during disaster response on social media. Also, a domain ontology to create an annotated information repository for supporting the varying abstract presentation of organized, actionable information nuggets regarding resource needs and availability in visual interfaces, as well as complex querying ability for who-what-where in coordination.

  • User Taglines: Alternative Presentations of Expertise and Interest in Social Media

    • ASE/IEEE Social-Informatics
    • November 14, 2012

    Techniques to curate short descriptions for presenting a user's information or expertise on social media. Also, a study of how can we exploit semantic knowledge on web to present user descriptions [HIGHLIGHT: Acceptance rate: 11.5%]

  • Twitris- a System for Collective Social Intelligence

    • Encyclopedia of Social Network Analysis and Mining (ESNAM), Springer
    • 2014

    Twitris, a Semantic Web application that facilitates understanding of social perceptions by Semantics-based processing of massive amounts of event-centric data. Twitris addresses challenges in large scale processing of social data, preserving spatio-temporal-thematic properties and focusing on multi-dimensional analysis of sptatio-temporal-thematic, people-content-network and sentiment-emotion-subjectivity facets. Twitris also covers context based semantic integration of multiple Web resources and expose semantically enriched social data to the public domain. Semantic Web technologies enable the system's integration and analysis abilities. It has applications for studying and analyzing social sensing and perception of a broad variety of events: politics and elections, social movements and uprisings, crisis and disasters, entertainment, environment, decision making and coordination, brand management, campaign effectiveness, etc.

  • With Whom to Coordinate, Why and How in Ad-hoc Social Media Communities during Crisis Response

    • ISCRAM-14
    • 2014

    During crises affected people, well-wishers, and observers join social media communities to discuss the event while sharing useful information relevant to response coordination, for example, specific resource needs. But it is difficult to identify and engage with such users, our framework enables such coordination assistive engagement.

  • Twitris v3: From Citizen Sensing to Analysis, Coordination and Action

    • AAAI, ICWSM-2013
    • July 8, 2013

    System to leverage social media analytics beyond computing the obvious, by focusing on targeted computing that can assist higer level phenomena such as coordination and decision making

  • Finding Influential Authors in Brand-Page Communities

    • AAAI, ICWSM-2012
    • June 4, 2012

    Techniques to find users for whom to engage with in evolving closed (topic centric) communities. Applications in brand management, crisis response as well as for channelizing actionable network effects (please talk to me further if interested)

  • A Qualitative Examination of Topical Tweet and Retweet Practices

    • AAAI, ICWSM-2010
    • May 22, 2010

    Study on the effect of content on network structures. Content has a role to play in shaping denser vs. sparse diffusion networks of interactions on social media.

  • Assisting Coordination during Crisis: A Domain Ontology based Approach to Infer Resource Needs from Tweets

    • ACM WebSci-2014
    • June 2014

    Ubiquitous social media during crises provides citizen reports on the situation, needs and supplies. Previous research extracts resource needs directly from the text (e.g. “Power cut to Coney Island and Brighton beach” indicates a power need). This approach assumes that citizens derive and write about specific needs from their observations, properly specified for the emergency response system, an assumption that is not consistent with general conversational behavior. In our study, Twitter messages (tweets) from Hurricane Sandy in 2012 clearly indicate power blackouts, but not their probable implications (e.g. loss of power to hospital life support systems). We use a domain model to capture such interdependencies between resources and needs. We represent these dependencies in an ontology that specifies the functional association between resources. Accurate interpretation of resource need/supply also depends on the location of a message. We show how inference based on a domain model combined with location detection and interpretation in the social data can enhance situational awareness, e.g., predicting a medical emergency before it is reported as critical.

  • Prediction of Topic Volume on Twitter

    • WebSci 2012 (Extended Abstract)
    • June 23, 2012
  • Framework for the Analysis of Coordination in Crisis Response

    • Collaboration & Crisis Informatics, CSCW-2012
    • February 11, 2012

    Position paper to present a framework to analyze crisis response coordination by leveraging social media messages shared after a disaster event

  • Understanding User-Community Engagement by Multi-faceted Features: A Case Study on Twitter

    • SoME-2011 Workshop on Social Media Engagement, in conjunction with WWW-2011
    • March 30, 2011

    A People-Content-Network analysis framework for user engagement in the online communities, by incorporating 3 fundamental aspects of social media: the participants (People), the posts generated them (Content), and the user connections (Network)

  • Performance Analysis of RFID Tag Antennas

    • International Journal on Wireless and Optical Communications
    • September 2008
  • Emergency-relief coordination on social media

    • First Monday

Hemant Purohit's Education

Wright State University

PhD, Computer Science & Engineering


Graduate Teaching Assistant,
Graduate Research Assitant

Activities and Societies: - Research in the fields of Social Networks Analysis, User Engagement, Community Coordination, Semantic Web and Knowledge enhanced computing using inter-disciplinary methodology with Social Scientists - Member of Social Media Relations group in Web-Support team at Kno.e.sis Research Center - Member of Social Event Management team at Kno.e.sis Research Center


B.Tech., Communication & Computer Engineering


Grade: 8.7/10

Activities and Societies: Electonics and Communication Lab support, Semantic Web Community, LNMIIT Programmers, Literary committee, Debate & Hosting teams, Sports- Chess & Badminton teams, Tech savvy

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