head> Hemant Purohit, Social Computing Research, Kno.e.sis, Wright State University
Hemant Purohit
Update: I defended PhD dissertation in Summer 2015, and accepted position of a tenure-track Assistant Professor in the Information Sciences & Technology department at George Mason University. New page: http://ist.gmu.edu/~hpurohit
Hemant Purohit (Ph.D. Candidate under Prof. Amit Sheth, Kno.e.sis Center, Computer Science & Engineering, Wright State University)
EXPERTISE: Computational Social Science| Text Mining| Knowledge Graph| Psycholinguistics| User Modeling

IMPACT: #OnlineSocialDynamics | #SocialGood #CrisisResponse

Research Portfolio

My research interest is to study human social dynamics on the web via an interdisciplinary approach involving Computer Science, Social Sciences, and Psychology. Leveraging the interplay of people, content and network features on social networks, I model social behavior of user intent and engagement in online citizen sensor communities to help design a cooperative system between citizens and organizations, with use-case of crisis response. I have recently started work on another social good problem for curbing gender-based violence, via modeling of societal beliefs to inform policy design.
My technical interest is to merge top-down and bottom-up computing approaches by employing domain semantics and guidance from offline behavioral knowledge to enhance statistical methods to understand online user behavior from unstructured, large-scale Social and Web data.

One list of Publications:


Quick Summary

Studying real-world problems
related to online human social dynamics (engagement, intent, influence, coordination, etc.) in social network communities by leveraging models with behavioral knowledge from psychology (Levins verbs, Social Identity & Cohesion, etc.). I have worked on Intent Mining, Matching, Expert Detection, Community Evolution, and User Engagement analysis in large-scale unstructured data from social media. My research has key applications in improving crisis coordination and the understanding of online user behavior.

Extensive collaboration
from the local to international level, for interdisciplinary guidance in addition to Prof. Sheth (Semantic Web), including Prof. Valerie Shalin (Cognitive Science), Prof. John Flach (Cognitive Systems), & Prof. T.K. Prasad (Algorithm Design) at WSU, Prof. Srinivasan Parthasarthy at OSU (Networks and Data Mining), Dr. Meenakshi Nagarajan at IBM Research (Social Computing), Dr. Patrick Meier (Humanitarian Coordination) & Dr. Carlos Castillo (Crisis Computing) at QCRI, and Dr. Fernando Diaz at Microsoft Research (Matching models).

Selected Talks

Awards and Honors


Learning via adaptability to the problem at hand is my biggest skill. Due largely to interdisciplinary PhD research, my work has spanned a variety of problems.

  • Courses taken in Ph.D. program:
    • Semantic Web
    • Information Retrieval
    • Data Mining
    • Machine Learning
    • Pattern Recognition
    • Web Information Systems
    • Cloud Computing
    • Database Systems & Design
    • Knowledge Representation
    • Distributed Computing Principles
    • Computation Complexity & Algorithms
    • Theoretical Background of Computing
    • Sampling Design
    • Communication in Science
    • Social Psychology
    • Multiple Independent Studies involving Psycholinguistics analysis

  • Technical Skills:
    • Language Fluency- Java, Python, JSP, XML, HTML, SQL
    • Semantic Technologies- RDF, OWL, Ontology, SPARQL, Virtuoso
    • Scalable Computing- Map-Reduce, Pig, Hadoop, Storm
    • Others- Weka, NLTK, LIWC, Gephi, Network WorkBench, MySQL

  • Conceptual Hands-on during PhD:
    • Machine Learning- Supervised Classification, Decision Trees, Ensembles (Random Forest), Naive Bayes, SVM, Linear Regression, Gradient Descent, Clustering, Cost Sensitivity, PCA
    • Graph Algorithms- HITS, Personalized PageRank
    • Knowledge-Graph- Entity and Relationship representation, Knowledge-base Creation, Inference
    • NLP- Entity Recognition, Disambiguation & Resolution, Dependency Tree, POS tagging
    • Text Mining- Co-occurence Metrices, Entropy, Mutual Information, KL and Jenson-Shannon Divergence, Topic Modeling
    • Psychology- Social Identity & Cohesion, Linguistic coordination, Attitudes, Behavior and Goals

*Check soft skills of Communication, Organization, Project Management and Coordination in the following services section.

Professional & Volunteering Services

Professional Community Services:

Volunteer Community Services:

  • - Coordination, Mapping and Analysis
    • J&K (India) Floods response via JKFloodRelief.org (now InCrisisRelief.org) . Among key team coordinators of V.O.I.C.E. to faciliate the largest international, citizen-led response drive with scalable impact for relief, involving 25+ orgs. In this unprecedented tech-assisted initiative, I also helped in data coordination for social media mining via our Twitris technology. (Teamwork cited by: Hindustan Times, OneIndia, Zee News, NPR, LightHouse Insights, etc.), Sept 2014
    • Phailin cyclone crisis-map, India . Initiative in collaboration with Google Crisis Response team and digital volunteers globally from different organizations (SBTF, OpenCrisis, Info4Disasters, HumanityRoad, etc.) and universities. (Teamwork cited by: Times Of India, DNA, Business Standard, EfyTimes, Kochi Reporter, Gadget Garrio, GeoSpatial World, Global Resilience Systems), Oct 2013
    • Uttarakhand floods crisis-map, India . Crisis-mapping initiative in collaboration with Google Crisis Response team, volunteers from universities around the world and from prestigious organizations (SBTF, Info4, OpenCrisis, HOT, CrisisMappersUK), including a surge support from Humanity Road contributed in this (Teamwork cited by The Hindu articles 1, 2), Jun 2013

  • - Technical volunteering for Social Data Mining
    • Oklahoma tornado, US. Extensive analysis of donation requests and offers to help (iRevolutions blog, also in Infographic), May 2013
    • Balochistan earthquake analysis with UN OCHA to identify key influencers on social media for needs such as medical aid, Sept 2013
    • Yolanda (Philippines) Typhoon response via Twitris technologies for assisting crowdsourcing app MicroMappers by my mentor Patrick Meier's social-innovation team at QCRI and SBTF, for UN OCHA. (iRevolutions blog: results & launch, Wall Street Journal), Nov 2013
    • Others: Hurricane Sandy, US, 2012; East cost snow storm, US, 2013; Khartoum floods, Sudan, 2013; Colorado floods, US, 2013

Contact Me

Please mail for potential job opportunities if you are interested in recruiting me: hemant [at] knoesis.org .
My LinkedIn Profile is here.