Paper accepted to Findings of EMNLP 

22 September 2020

Our paper, "A Semantics-based Approach to Disclosure Classification in User-Generated Online Content", will appear in Findings of EMNLP. The work presents an approach to detect emotional and information self-disclosure in natural language through the use of Semantic Role Labeling. The work is led by graduate student Chandan Akiti.

Paper accepted to Applied Network Science 

21 August 2020

"Fragility of a multilayer network of international supply chains" has been accepted for publication in Applied Network Science. The paper explores propagation of economic shocks along intranational supply chains through network cascade modeling over multiregional input-output linkages. A measure of fragility is proposed, and economic sectors disrupted by COVID-19 are highlighted. 

Dr. Rajtmajer and colleagues receive award from the NSF's RAPID program

27 May 2020

Dr. Rajtmajer and Dr. Anna Squicciarini have received funding through the National Science Foundation's RAPID program to study privacy risks emergent with online behavior during the Coronavirus pandemic. The work aims to better understand how trust is established in online settings and whether that process is expedited during crisis. 

Dr. Rajtmajer and colleagues receive award from the Office of Naval Research

15 May 2020

Dr. Rajtmajer, Dr. Aiping Xiong, Dr. Christopher Griffin, and our collaborators at Quantitative Scientific Solutions (QS-2) have received funding through the Navy's STTR program to study and mitigate botnets on Twitter. The project, Sociolinguistic Information Filtering Tool (SIFT), leverages novel natural language processing, network science and game theoretic approaches to characterize classes of malicious accounts and provide users with more sophisticated options to filter this content.

Dr. Rajtmajer, Dr. Vasant Honavar, Dr. Daniel Susser, and Dr. Jose Soto receive award from the Institute for Computational and Data Sciences

07 May 2020

Dr. Rajtmajer and colleagues have been awarded seed funds from Penn State's Institute for Computational and Data Sciences for work to empirically evaluate causal inference-based tests of algorithmic fairness. These studies will inform new work on fairness and discrimination in AI.

New work on privacy during Coronavirus released on arXiv

21 April 2020

Dr. Rajtmajer and colleagues have shared a new study of self-disclosure on Twitter during the Coronavirus pandemic. We suggest that increased disclosure may serve support-seeking during crisis. A preprint is available here.

Paper on Cognitive Security accepted to the ACM Symposium on the Science of Security (HoTSoS)

22 February 2020

"Automated Influence and the Challenge of Cognitive Security" has been accepted to ACM's Symposium on the Science of Security (HoTSoS 2020). In this work, Dr. Rajtmajer and Dr. Daniel Susser consider the threat of computational propaganda to national security and the ethical questions it raises.

New work on Russian Twitter Operations released on arXiv

27 January 2020

Dr. Rajtmajer and colleagues have shared new work revealing coordination in Russian influence operations on Twitter. The work uses a dynamical systems model to construct families of users with common harmonics and develops a taxonomy of strategic behavior.  A preprint is available here.

Team to compete in AAAI shared task on affect understanding (AffCon 2020)

16 January 2020

Work led by Masters student Chandan Akiti will be presented at AffCon 2020 in February 2020. The team will compete in the Computational Linguistics Affect Understanding (Cl-Aff) Shared Task on modeling interactive affective responses. The team has developed a novel approach for the joint classification of self-disclosure and supportiveness in short text, leveraging BERT, LSTM and CNN neural networks.

Dr. Rajtmajer and Dr. Shomir Wilson receive accelerator award for work on privacy and socioeconomic factors

03 January 2020

Dr. Rajtmajer and Dr. Shomir Wilson have been awarded seed funds from Penn State's Center for Social Data Analytics (C-SoDA) for joint work exploring the effects of socioeconomic factors on privacy behaviors online. Proposed work is motivated by emerging evidence that current practices for informing technology users about privacy disproportionately fail to help the very populations that are most vulnerable.

Team selected for DARPA's SCORE program

23 October 2019

Dr. Rajtmajer and colleagues (Penn State, Texas A&M, Old Dominion, Microsoft Research) have been selected by the Defense Advanced Research Projects Agency (DARPA) to develop AI to score the credibility of research claims in the social and behavioral sciences. The team will build synthetic prediction markets populated by artificial agents (bot traders) that reason on information extracted from published papers and metadata. See the article in the Penn State News

Paper accepted to IEEE Big Data 2019

17 October 2019

"Toward Image Privacy Classification and Spatial Attribution of Private Content" has been accepted to IEEE Big Data 2019.  The work extends the problem of determining a single privacy label for a given image to jointly inferring a privacy label and detecting the specific areas of sensitive content within a privately labeled image. The paper is joint work with Drs. Haoti Zhong, Anna Squicciarini and David Miller (Penn State).

Paper accepted to Complex Networks 2019

7 October 2019

"Performance of a Multiplex Commodity Flow Network in the United States Under Disturbance" has been accepted to Complex Networks 2019.  The work furthers understanding of supply chain and commodity trade networks through construction and analysis of the interstate input-out multiplex network of the U.S. commodity and service sectors. The paper is joint work with Dr. Caitlin Grady (Penn State) and Dr. Alfonso Mejia (Penn State).

Paper accepted to CIKM 2019

9 August 2019

"Rating Mechanisms for Sustainability of Crowdsourcing Platforms" has been accepted to CIKM 2019.  The paper, in collaboration with Dr. Chexi Qiu (Rowan University) and Dr. Anna Squicciarini (Penn State) introduces rating mechanisms to evaluate the behavior of task requesters in crowdsourcing platforms. We take a game theoretic approach, validated on data from Amazon Mechanical Turk.

Paper accepted to GAMESEC 2019

28 July 2019

"Power Law Public Goods Game for Personal Information Sharing in News Comments" has been accepted to GAMESEC 2019.  The work proposes a public goods game model of user sharing in an online commenting forum. In particular, we assume that users who share personal information incur an information cost but reap the benefits of a more extensive social interaction. Freeloaders benefit from the same social interaction but do not share personal information. A preprint of the paper is available on the arXiv:

Dr. Rajtmajer and Dr. Anna Squicciarini awarded College of IST seed grant

13 June 2019

Dr. Rajtmajer and Dr. Anna Squicciarini are amongst eight recipients of funding from the College of IST’s Seed Grant Program. The project, entitled "Game-theoretic Modeling of Individual Self-disclosure Online" aims to formalize models of information sharing and privacy behaviors in public online environments.

Dr. Rajtmajer and Dr. Ben Johnson receive award from Institute for Cyberscience

16 April 2019

Dr. Rajtmajer and Dr. Ben Johnson have received seed funding from Penn State's Institute for Cyberscience for proposed work, "Leveraging AI for Game-Theoretic Models of Judicial Decision Making". The project will explore rich historical data to better understand and model the mechanisms and impacts of judicial decision making. 

Rock Ethics ETE Fellows to present at undergraduate research exhibition

15 April 2019

The Rock Ethics Institute's Engineering, Technology and Ethics fellows (Jack Iffert, Ryan Jacobs, Vidur Mishra, Christopher Thomas and Nicholas Wanner) will present their work, titled "Security Risks and Ethical Implications for the Automation of Commercial Port Facilities" at the 2019 Penn State Undergraduate Research exhibition of April 17, 2019.  Their work is the culmination of a year-long project, co-advised by Dr. Rajtmajer, Dr. Caitlin Grady (Civil Engineering), Dr. Daniel Susser (IST) and Dr. Alan Wagner (Aerospace Engineering).

Dr. Rajtmajer to moderate panel on security and emerging technologies 

27 March 2019

Dr. Rajtmajer will moderate a panel discussion on Autonomous Systems and Emerging Technologies at the Center for Security Research and Education's Security and the Autonomous Future symposium, April 4th and 5th. The event will bring together national experts to explore how autonomous systems will effect our personal, national and global security.

Paper accepted to SIAM Journal on Applied Dynamical Systems

14 February 2019

Work with Dr. Christopher Griffin, Dr. Anna Squicciarini and Dr. Andrew Belmonte has been accepted to SIAM Journal on Applied Dynamical Systems (SIADS). The work, entitled "Consensus and Information Cascades in Game-Theoretic Imitation Dynamics with Static and Dynamic Network Topologies" provides a game-theoretic framework for modeling information spread online. A preprint is available on the arXiv:

Paper accepted to WWW 2019

21 January 2019

Work with Prasanna Umar and Dr. Anna Squicciarini has been accepted as a short paper to The Web Conference (WWW) 2019. The work, entitled "Detection and Analysis of Self-Disclosure in Online News Commentaries" presents a novel approach to the detection of language indicative of various types of self-disclosure, leveraging both syntactic and semantic information present in text.

Dr. Rajtmajer and Dr. Daniel Susser receive award from Center for Security Research and Education

20 January 2019

Dr. Rajtmajer and Dr. Daniel Susser have been awarded seed funding from Penn State's Center for Security Research and Education. The project, "Understanding the Impact of Self-Disclosure on Cognitive Security", will explore the contexts which prime individuals to self-disclose online in order to better understand the potential weaponization of personal information. The 1-year effort will engage graduate and undergraduate students from the College of IST, the Department of Philosophy, and across campus.

Beyond the Crisis: Research Ethics in the Age of Open Science

26 September 2018

Dr. Rajtmajer will present "Beyond the Crisis: Research Ethics in the Age of Open Science" at the Rock Ethics Institute Colloquia Series on October 4, 2018. The talk with discuss recent progress toward an interpretable scholarly record through promotion of transparency and openness in reporting and publishing.

Dr. Rajtmajer joins the Penn State faculty

11 August 2018

Dr. Rajtmajer has joined the faculty of Penn State's College of Information Sciences and Technology! Dr. Rajtmajer will hold a joint appointment at Penn State's Rock Ethics Institute.

©2019 Sarah Rajtmajer, PhD