Archive for the ‘Blog’ Category

Betweenness to assess leaders in criminal networks: New evidence using the dual projection approach

30
Nov

A recent article “Betweenness to assess leaders in criminal networks: New evidence using the dual projection approach” by Rosanna Grassi, Francesco Calderoni, and Monica Bianchi show the performance of different betweenness centrality measures in identifying criminal leaders in a meeting participation network. Each of the measures reports different ranking of leaders and dual projection based approaches show better performance compared to traditional betweenness or flow-based measures. Read more:

Contractor discusses the approaches and open problems across the field of network sciences at NASN

30
Nov

At the North American Regional Social Networks (NASN) Conference of the International Network for Social Network Analysis (INSNA) in Washington, D.C., Contractor spoke as a panel member to discuss common and complementary themes, approaches, and open problems across the major field of network sciences — primarily focussing on the bridges between social network analysis (SNA) and network science (NS), but also addressing other fields such as complex systems (CS), computational social science (CSS) and areas of computer and information sciences (CS, IS).    Moody, J., Contractor, N., Phillips, N., Young, L. (2018, November). Complementarity of the Network Sciences: distinctions, tensions and synergies across SNA, NS and the other system sciences. Panel member at the North American Regional Social Networks (NASN) Conference of the International Network for Social Network Analysis (INSNA), Washington, D.C.

Cameron DeChurch presented at NASN today

28
Nov

Nov 28, 2018 – SONIC summer intern, Cameron DeChurch, presented at the North American Regional Social Networks (NASN) Conference of the International Network for Social Network Analysis (INSNA) today. This summer he used historical records to construct digital networks of the collaboration among Florentine Renaissance painters. His paper with Noshir Contractor, “Using Network Science to Discover the Grand Masters of the Florentine Renaissance” finds that rather than the household names of Michelangelo and DaVinci, it was the grand masters like Verrochio and Perugino who ultimately had more impact through their lineage, by training painters who would go on to produce great works. Citation: DeChurch, C.J., & Contractor, N.S. (2018, November). Using Network Science to Discover the Grand Masters of the Florentine Renaissance. Paper presented at the North American Regional Social Networks Conference. Washington, D.C.          

SONIC Hosts Prof. Krackhardt

14
Nov

Professor Krackhardt of Carnegie Mellon guest lectured the Master of Science in Analytic’s class. Krackhard pioneered the concept of “cognitive social structures.” In the lecture, he shared some of his case studies and discussed how an individual’s power can be measured according to his/her position in the whole network structure. He provided network visualizations and demonstrated how they can provide better insights into analyzing an individual’s power.

Contractor mentors young scholars at the 104th Annual NCA Convention

12
Nov

This past weekend at the National Communication Association (NCA) 104th Annual Convention, Contractor provided mentorship during the sessions titled “Scholarly Recess: Professional Development for Students and Junior Scholars” for the Group Communication Division and “Pursuing Grant-Funded Research in Communication: Challenges and Opportunities across the Discipline.” He also served as a respondent for the Top Papers session for the Group Communication Division.

Alina presents at the NCA 104th Annual Convention

12
Nov

Alina presented the paper, “Deep Space Collaboration: Impact of Communication Latency on Collaborative Work” at the NCA 104th Annual Convention in Salt Lake City, UT. Citation: Lungeanu, A., Park, P., DeChurch, L. A., & Contractor, N. S. (2018, November). Deep Space Collaboration: Impact of Latency and Social Networks on Collaborative Work. Paper presented at the NCA 104th Annual Convention, Salt Lake City, UT.

How algorithmic popularity bias hinders or promotes quality

05
Nov

By Giovanni Luca Ciampaglia, Azadeh Nematzadeh, Filippo Menczer & Alessandro Flammini Algorithms that favor popular items are used to help us select among many choices, from top-ranked search engine results to highly-cited scientific papers. The goal of these algorithms is to identify high-quality items such as reliable news, credible information sources, and important discoveries–in short, high-quality content should rank at the top. Prior work has shown that choosing what is popular may amplify random fluctuations and lead to sub-optimal rankings. Nonetheless, it is often assumed that recommending what is popular will help high-quality content “bubble up” in practice. Here we identify the conditions in which popularity may be a viable proxy for quality content by studying a simple model of a cultural market endowed with an intrinsic notion of quality. A parameter representing the cognitive cost of exploration controls the trade-off between quality and popularity. Below and above a critical exploration cost, popularity bias is more likely to hinder quality. But we find a narrow intermediate regime of user attention where an optimal balance exists: choosing what is popular can help promote high-quality items to the top. These findings clarify the ...

Alina joins Network Science Institute as visiting faculty

30
Oct

Research Assistant Professor Alina Lungeanu joins Network Science Institute at Northeastern University, Boston MA as visiting faculty starting Fall 2018. Congratulations Alina! Link: https://www.networkscienceinstitute.org/people/alina-lungeanu

9th ANN / SONIC / NICO Network Theory Workshop – Success

29
Oct

This past weekend over 35 scholars at leading-edge brain science and social network gathered for the 9th annual ANN-SONIC-NICO Network Theory Workshop under the theme of “Brain Science and Social Networks.” The workshop was held at Northwestern’s Kellogg Global Hub and sponsored by the Annenberg Networks Network (ANN), Science of Networks in Communities (SONIC), Northwestern Institute on Complex Systems (NICO), and the Army Research Office (ARO). Details about the workshop can be found at: Website: https://www.kellogg.northwestern.edu/news-events/conference/international-workshop-on-network-theory/​ Conference presentation videos and slides will be available on the website shortly. The conference organizers would like to thank all the speakers and participants for their attendance.

Contractor publishes in @HarvardBiz

24
Oct

Noshir Contractor along with SONIC Affiliated Faculty, Paul Leonardi, publish, “Better People Analytics – Measure who they know, not just who they are ” in Harvard Business Review.   Citation: Leonardi, P., & Contractor, N. S. (2018, Nov-Dec). Better People Analytics: Measure who they know, not just who they are. Harvard Business Review.