Publications

Underlined authors contributed equally. License for the datasets and code is CC BY 4.0 unless noted otherwise.

Books

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    Complex Spreading Phenomena in Social Systems
    Eds: Sune Lehmann and Yong-Yeol Ahn
    Springer (2018)
    Link | Homepage

Preprints

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    Network Cards: concise, readable summaries of network data
    James Bagrow and Yong Yeol Ahn
    arXiv | PDF | code

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    Mobility network reveals the impact of geographic vaccination heterogeneity on COVID-19
    Yuan Yuan, Eaman Jahani, Shengjia Zhao, Yong-Yeol Ahn, Alex Pentland
    medRXiv

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    People, Places, and Ties: Landscape of social places and their social network structures
    Jaehyuk Park, Bogdan State, Monica Bhole, Michael Bailey, Yong-Yeol Ahn
    Submitted
    arXiv

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    Unsupervised embedding of trajectories captures the latent structure of mobility
    Dakota Murray, Jisung Yoon, Sadamori Kojaku, Rodrigo Costas, Woo-Sung Jung, Staša Milojević, Yong-Yeol Ahn
    Submitted
    arXiv

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    Extracting hierarchical backbones from bipartite networks
    Woo Seong Jo, Jaehyuk Park, Arthur Luhur, Beom Jun Kim, Yong-Yeol Ahn
    Submitted
    arXiv | code

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    Association Between Sampling Method and Covid-19 Test Positivity Among Undergraduate Students: Testing Friendship Paradox in Covid-19 Network of Transmission
    Sina Kianersi, Yong-Yeol Ahn, Molly Rosenberg
    Submitted
    medRxiv

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    Sameness Attracts, Novelty Disturbs, but Outliers Flourish in Fanfiction Online
    Elise Jing, Simon DeDeo, Yong-Yeol Ahn
    Submitted
    arXiv

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    Comparing Measures of Centrality in Bipartite Social Networks: A Study of Drug Seeking for Opioid Analgesics
    Brian Aronson, Kai-Cheng Yang, Meltem Odabas, Yong-Yeol Ahn, Brea Perry
    Submitted
    SocArXiv

Articles

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    The latent structure of global scientific development
    Lili Miao, Dakota Murray, Woo-Sung Jung, Vincent Larivière, Cassidy R. Sugimoto, Yong-Yeol Ahn
    Nature Human Behaviour (2022)
    Link | arXiv | PDF | Code | Data

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    Metrics and mechanisms: Measuring the unmeasurable in the science of science
    Lingfei Wu, Aniket Kittur, Hyejin Youn, Staša Milojević, Erin Leahey, Stephen M. Fiore, Yong Yeol Ahn
    Journal of Informetrics 16, 101290 (2022)
    DOI | PDF | arXiv

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    The Impact of Viral Posts on Visibility and Behavior of Professionals: A Longitudinal Study of Scientists on Twitter
    Rakibul Hasan, Cristobal Cheyre, Yong-Yeol Ahn, Roberto Hoyle, and Apu Kapadia
    ICWSM (2022)
    Link | PDF

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    Misinformation, Believability, and Vaccine Acceptance Over 40 Countries: Takeaways From the Initial Phase of The COVID-19 Infodemic
    Karandeep Singh, Gabriel Lima, Meeyoung Cha, Chiyoung Cha, Juhi Kulshrestha, Yong-Yeol Ahn, Onur Varol
    PLOS ONE 17, e0263381 (2022)
    Link | PDF | arXiv

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    Substitution of Nonpharmacologic Therapy With Opioid Prescribing for Pain During the COVID-19 Pandemic
    Byungkyu Lee, Kai-Cheng Yang, Patrick Kaminski, Siyun Peng, Meltem Odabas, Sumedha Gupta, Harold D. Green Jr, Yong-Yeol Ahn, and Brea L. Perry
    JAMA Network Open 4, e2138453 (2021)
    Link | PDF

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    Residual2Vec: Debiasing graph embedding with random graphs
    Sadamori Kojaku, Jisung Yoon, Isabel Constantino, Yong-Yeol Ahn
    NeurIPS (2021)
    Link | PDF | arXiv | Code

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    Characterizing Partisan Political Narrative Frameworks about COVID-19 on Twitter
    Elise Jing, Yong-Yeol Ahn
    EPJ Data Science 10, 53 (2021)
    Link | PDF | arXiv

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    Predicting Anti-Asian Hateful Users on Twitter during COVID-19
    Jisun An, Haewoon Kwak, Claire Seungeun Lee, Bogang Jun, Yong-Yeol Ahn
    EMNLP (findings) (2021)
    Link | PDF | arXiv

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    Use of and Comorbidities Associated With Diagnostic Codes for COVID-19 in US Health Insurance Claims
    Kai-Cheng Yang, Byungkyu Lee, Yong-Yeol Ahn, and Brea L. Perry
    JAMA Network Open 4, e2124643 (2021)
    Link | PDF

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    FrameAxis: characterizing microframe bias and intensity with word embedding
    Haewoon Kwak, Jisun An, Elise Jing, Yong-Yeol Ahn
    PeerJ Computer Science 7, e644 (2021)
    Link | PDF | arXiv

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    New means, new measures: assessing prescription drug-seeking indicators over 10 years of the opioid epidemic
    Brea L. Perry, Meltem Odabaş, Kai-Cheng Yang, Byungkyu Lee, Patrick Kaminski, Brian Aronson, Yong-Yeol Ahn, Carrie B. Oser, Patricia R. Freeman, Jeffrey C. Talbert
    Addiction (2021)
    Link | PDF

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    Principled approach to the selection of the embedding dimension of networks
    Weiwei Gu, Aditya Tandon, Yong-Yeol Ahn, Filippo Radicchi
    Nature Comunications 12, 3772 (2021).
    Link | PDF | arXiv | Code

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    Neural Embeddings of Scholarly Periodicals Reveal Complex Disciplinary Organizations
    Hao Peng, Qing Ke, Ceren Budak, Daniel Romero, Yong-Yeol Ahn
    Science Advances 7, eabb9004 (2021).
    Link | PDF | arXiv | Code | Data

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    Persona2vec: A Flexible Multi-role Representations Learning Framework for Graphs
    Jisung Yoon, Kai-Cheng Yang, Woo-Sung Jung, Yong-Yeol Ahn
    PeerJ Computer Science 7, e439 (2021)
    Link | PDF | arXiv | Code

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    Prevalence of Misinformation and Factchecks on the COVID-19 Pandemic in 35 Countries: Observational Infodemiology Study
    Meeyoung Cha, Chiyoung Cha, Karandeep Singh, Gabriel Lima, Yong-Yeol Ahn, Juhi Kulshrestha, Onur Varol
    JMIR Human Factors 8, e23279 (2021)
    Link

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    The effectiveness of backward contact tracing in networks
    Sadamori Kojaku, Laurent Hébert-Dufresne, Enys Mones, Sune Lehmann, Yong-Yeol Ahn
    Nature Physics (2021)
    Link | PDF | arXiv | Code
    Nature Physics News & Views | Washington Post | Frankfurter Allgemeine | F.A.Z. Wissen - Der Podcast

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    On the challenges of predicting microscopic dynamics of online conversations
    John BollenBacher, Diogo Pacheco, Pik-Mai Hui, Yong-Yeol Ahn, Alessandro Flammini, Filippo Menczer
    Applied Network Science 6, 12 (2021)
    Link | PDF

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    Systematic Evaluation of State Policy Interventions Targeting the US Opioid Epidemic
    Byungkyu Lee, Wanying Zhao, Kai-Cheng Yang, Yong-Yeol Ahn, Brea Perry
    JAMA Network Open 4(2), e2036687 (2021)
    Link | PDF | Data and Code

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    BiRank: Fast and Flexible Ranking on Bipartite Networks with R and Python
    Kai-Cheng Yang, Brian Aronson, and Yong-Yeol Ahn
    The Journal of Open Source Software 5(51), 2315 (2020)
    Link | PDF | Code

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    A Systematic Media Frame Analysis of 1.5 Million New York Times Articles from 2000 to 2017
    Haewoon Kwak, Jisun An, Yong-Yeol Ahn
    WebSci’20
    Link | arXiv | PDF

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    Evidence from internet search data shows information-seeking responses to news of local COVID-19 cases
    Ana I. Bento, Thuy Nguyen, Coady Wing, Felipe Lozano-Rojas, Yong-Yeol Ahn, and Kosali Simon
    PNAS 117, 11220 (2020)
    Link | PDF

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    Co-contributorship Network and Division of Labor in Individual Scientific Collaborations
    Chao Lu, Yingyi Zhang, Yong-Yeol Ahn, Ying Ding, Chenwei Zhang, Dandan Ma
    JASIST 71, 1162 (2020)
    Link | arXiv | PDF

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    Co-prescription network reveals social dynamics of opioid doctor shopping
    Brea L. Perry, Kaicheng Yang, Patrick Kaminski, Meltem Odabas, Jaehyuk Park, Michelle Martel, Carrie B. Oser, Patricia R. Freeman, Yong-Yeol Ahn, and Jeffrey Talbert
    PLoS ONE 14, e0223849 (2019)
    Link | PDF

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    Information overload in group communication: from conversation to cacophony in the Twitch chat
    Azadeh Nematzadeh, Giovanni Luca Ciampaglia, Yong-Yeol Ahn, and Alessandro Flammini
    Royal Society Open Science 6, 191412 (2019)
    Link | PDF | Data | Code

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    Global labor flow network reveals the hierarchical organization and dynamics of geo-industrial clusters
    Jaehyuk Park, Ian B. Wood, Elise Jing, Azadeh Nematzadeh, Souvik Ghosh, Michael D. Conover, and Yong-Yeol Ahn
    Nature Communications 10, 3449 (2019)
    Link | PDF | Code
    Phys.org | Science Daily | Inside Indiana Business | Crimson Catalyst | Other coverage

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    Massive Multi-agent Data-Driven Simulations of the GitHub Ecosystem
    Jim Blythe, John Bollenbacher, Di Huang, Pik-Mai Hui, Rachel Krohn, Diogo Pacheco, Goran Muric, Anna Sapienza, Alexey Tregubov, Yong-Yeol Ahn, Alessandro Flammini, Kristina Lerman, Filippo Menczer, Tim Weninger, and Emilio Ferrara
    PAAMS’19
    Link | PDF | Code

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    Evolution of the informational complexity of contemporary western music
    Thomas Parmer and Yong-Yeol Ahn
    ISMIR’19
    Link | arXiv | PDF | Code

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    Element-centric clustering comparison unifies overlaps and hierarchy
    Alexander J. Gates, Ian B. Wood, William P. Hetrick, and Yong-Yeol Ahn
    Scientific Reports 9, 8574 (2019)
    Link | PDF | Code

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    CluSim: a python package for calculating clustering similarity
    Alexander J. Gates and Yong-Yeol Ahn
    The Journal of Open Source Software 4(35), 1264 (2019)
    Link | PDF | Code

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    Community-Based Event Detection in Temporal Networks
    Pablo Moriano, Jorge Finke, and Yong-Yeol Ahn
    Scientific Reports 9, 4358 (2019)
    Link | PDF | Code

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    Optimal modularity and memory capacity of neural reservoirs
    Nathaniel Rodriguez, Eduardo Izquierdo, and Yong-Yeol Ahn
    Network Neuroscience 3, 551 (2019)
    Link | PDF | Code

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    Factors affecting sex-related reporting in medical research: a cross-disciplinary bibliometric analysis
    Cassidy R. Sugimoto, Yong-Yeol Ahn, Elise Smith, Benoit Macaluso, and Vincent Larivière
    Lancet 393 9-15 (2019)
    Link | PDF | Code
    Guardian | Reuters | Japan News | Wired | Other coverages

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    Race and the beauty premium: Mechanical Turk workers’ evaluations of Twitter accounts
    Anne Groggel, Shirin Nilizadeh, Yong-Yeol Ahn, Apu Kapadia, and Fabio Rojas
    Information, Communication & Society (2018)
    Link | PDF

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    Scalable Detection of Viral Memes from Diffusion Patterns
    Pik-Mai Hui, Lilian Weng, Alireza Sahami Shirazi, Yong-Yeol Ahn, and Filippo Menczer
    Complex Spreading Phenomena in Social Systems pp.197-211 (Springer) (2018)
    Link | PDF

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    Spreading in Social Systems: Reflections
    Sune Lehmann and Yong-Yeol Ahn
    Complex Spreading Phenomena in Social Systems pp.351-358 (Springer) (2018)
    Link | arXiv | PDF

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    Optimal Modularity in Complex Contagion
    Azadeh Nematzadeh, Nathaniel Rodriguez, Alessandro Flammini, and Yong-Yeol Ahn
    Complex Spreading Phenomena in Social Systems pp.97-107 (Springer) (2018)
    Link | arXiv | PDF

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    SemAxis: A Lightweight Framework to Characterize Domain-Specific Word Semantics Beyond Sentiment
    Jisun An, Haewoon Kwak, and Yong-Yeol Ahn
    ACL’18 (2018)
    Link | arXiv | PDF | Data and code

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    The Minor fall, the Major lift: inferring emotional valence of musical chords through lyrics
    Artemy Kolchinsky, Nakul Dhande, Kengjeun Park, and Yong-Yeol Ahn
    Royal Society Open Science 4, 170952 (2017)
    Link | arXiv | PDF | Data | Code
    Science | The Conversation | Atlas Obscura | QUARTZ | List of media coverage

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    The impact of random models on clustering similarity
    Alexander J. Gates and Yong-Yeol Ahn
    Journal of Machine Learning Research 18, 1 (2017)
    Link | arXiv | PDF

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    Inverse resolution limit of partition density and detecting overlapping communities by link-surprise
    Juyong Lee, Zhong-Yuan Zhang, Jooyoung Lee, Bernard R. Brooks, Yong-Yeol Ahn
    Scientific Reports 7, 12399 (2017)
    Link | arXiv | PDF

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    Social Contagions on weighted networks
    Yu-Xiao Zhu, Wei Wang, Ming Tang, Yong-Yeol Ahn
    Physical Review E 96, 012306 (2017)
    Link | arXiv | PDF

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    Data-driven Methods for the Study of Food Perception, Preparation, Consumption, and Culture
    Ole G. Mouritsen, Rachel Edwards-Stuart, Yong-Yeol Ahn, Sebastian E. Ahnert
    Front. ICT 4, 15 (2017)
    Link | PDF

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    A systematic identification and analysis of scientists on Twitter
    Qing Ke, Yong-Yeol Ahn, Cassidy R. Sugimoto
    PLoS One 12, e0175368 (2017)
    Link | arXiv | PDF
    Nature News | LSE Blog

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    Improving land use inference by factorizing mobile phone call activity matrix
    Huina Mao, Yong-Yeol Ahn, Budhendra Bhaduri, and Gautam Thakur
    Journal of Land Use Science 12, 138 (2017)
    Link | PDF

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    Gendered Conversation in a Social Game-Streaming Platform
    Supun Nakandala, Giovanni Luca Ciampaglia, Norman Makoto Su, Yong-Yeol Ahn
    ICWSM’17 (2017)
    Link | arXiv | PDF | Code
    Motherboard | Kotaku | List of other coverage

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    Collective Dynamics of Belief Evolution under Cognitive Coherence and Social Conformity
    Nathaniel Rodriguez, Johan Bollen, Yong-Yeol Ahn
    PLoS ONE 11, e0165910 (2016)
    Link | PDF | Code

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    Network Landscape of Western Classical Music
    Arram Bae, Doheum Park, Yong-Yeol Ahn, Juyong Park
    Leonardo 49, 448 (2016)
    Link

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    Twitter’s Glass Ceiling: The Effect of Perceived Gender on Online Visibility
    Shirin Nilizadeh, Anne Groggel, Peter Lista, Srijita Das, Yong-Yeol Ahn, Apu Kapadia, Fabio Rojas
    ICWSM’16 (2016)
    Link | PDF | Code

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    The Multi-Scale Network Landscape of Collaboration
    Arram Bae, Doheum Park, Yong-Yeol Ahn, Juyong Park
    PLoS ONE 11, e0151784 (2016)
    Link | PDF

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    Characterizing Conversation Patterns in Reddit: From the Perspectives of Content Properties and User Participation Behaviors
    Daejin Choi, Jinyoung Han, Taejoong Chung, Yong-Yeol Ahn, Byung-Gon Chun, Ted Taekyoung Kwon
    COSN’15 (2015)
    Link | PDF

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    Quantifying socio-economic indicators in developing countries from mobile phone communication data: applications to Côte d’Ivoire
    Huina Mao, Xin Shuai, Yong-Yeol Ahn, and Johan Bollen
    EPJ Data Science 4, 1-16 (2015)
    Link | PDF

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    Optimizing drug-target interaction prediction based on random walk on heterogeneous networks
    A. Seal, Y.-Y. Ahn, and D. J. Wild.
    Journal of Cheminformatics 7, 40 (2015)
    Link | PDF

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    Robustness and modular structure in networks
    J.P. Bagrow, S. Lehmann, and Y.-Y. Ahn
    Network Science 3, 509 (2015)
    Link | arXiv | PDF

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    Cooperative and Competitive Spreading Dynamics on the Human Connectome
    B. Mišić, R. F. Betzel, A. Nematzadeh, J. Goñi, A. Griffa, P. Hagmann, A. Flammini, Y.-Y. Ahn, and O. Sporns
    Neuron 86, 1518 (2015)
    Link | PDF
    IUB News

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    Community detection in bipartite networks using weighted symmetric binary matrix factorization
    Z.-Y. Zhang and Y.-Y. Ahn
    Int. J. Mod. Phys. C 0, 1550096 (2015)
    Link | arXiv | PDF

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    Tie strength distribution in scientific collaboration networks
    Qing Ke and Yong-Yeol Ahn
    Physical Review E 90, 032804 (2014)
    Link | arXiv | PDF

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    Community-Enhanced De-anonymization of Online Social Networks
    Shirin Nilizadeh, Apu Kapadia, and Yong-Yeol Ahn
    CCS’14 (2014)
    PDF

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    Optimal Network Modularity for Information Diffusion
    Azadeh Nematzadeh, Emilio Ferrara, Alessandro Flammini, and Yong-Yeol Ahn
    Physical Review Letters (Editors’ suggestion) 113, 088701 (2014)
    Link | Erratum | arXiv | PDF

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    A Network Framework of Cultural History
    Maximilian Schich, Chaoming Song, Yong-Yeol Ahn, Alexander Mirsky, Mauro Martino, Albert-László Barabási, and Dirk Helbing
    Science 345, 558 (2014)
    Link | PDF | Project page | Nature video: Charting culture
    Nature News | National Geographic | Business Insider | The Times | Daily Mail | Spiegel | Scientific American | NPR | 동아사이언스

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    Misogynistic language on Twitter and sexual violence
    Rachel Fulper, Giovanni Luca Ciampaglia, Emilio Ferrara, Yong-Yeol Ahn, Alessandro Flammini, Filippo Menczer, Bryce Lewis, Kehontas Rowe
    ChASM’14 (2014)
    PDF

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    Predicting Successful Memes using Network and Community Structure
    Lilian Weng, Filippo Menczer, and Yong-Yeol Ahn
    ICWSM’14 (2014)
    Link | arXiv | PDF

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    Metabolic Network Analysis-Based Identification of Antimicrobial Drug Targets in Category A Bioterrorism Agents
    Yong-Yeol Ahn, Deok-Sun Lee, Henry Burd, William Blank, Vinayak Kapatral
    PLoS ONE 9(1): e85195 (2014)
    Link | PDF

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    Geography and Similarity of Regional Cuisines in China
    Y.-X. Zhu, Z. Huang, Z.-K. Zhang, Q.-M. Zhang, T. Zhou, and Y.-Y. Ahn
    PLOS ONE 8(11): e79161 (2013)
    Link | arXiv | PDF | Data and code
    Techonological Review | Wired: Social Dimension

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    Virality Prediction and Community Structure in Social Networks
    L. Weng, F. Menczer, and Y.-Y. Ahn
    Scientific Reports 3, 2522 (2013)
    Link | arXiv | PDF | Slides | Project page | Data
    Scientific American | IEEE SPECTRUM

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    Overlapping Community Detection in Complex Networks using Symmetric Binary Matrix Factorization
    Z.-Y. Zhang, Y. Wang, and Y.-Y. Ahn
    Physical Review E 87, 062803 (2013)
    Link | arXiv | PDF | Code

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    The Flavor Network
    Y.-Y. Ahn and S. Ahnert
    Leonardo 46, 272 (2013)
    Link | PDF

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    Mobile Communications Reveal the Regional economy in Côte D’ivoire
    H. Mao, X. Shuai, Y.-Y. Ahn, J. Bollen
    NetMob 2013: Data for Development Challenge
    Link

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    Delayed Information Cascades in Flickr: Measurement, Analysis, and Modeling
    M. Cha, F. Benevenuto, Y.-Y. Ahn, and K. P. Gummadi
    Computer Networks 56, 1066 (2012)
    Link | PDF

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    Flavor network and the principles of food pairing
    Y.-Y. Ahn, S. Ahnert, J. P. Bagrow, and A.-L. Barabási
    Scientific Reports 1, 196 (2011)
    Link | arXiv | PDF | Hi-res Fig 2 | poster | Ingredient-compounds dataset | Flavor network backbone | Recipe datasets with cuisines
    Nature News | Scientific American | Technology Review | List of media coverage

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    Evidence for Network Evolution in an Arabidopsis Interactome Map
    Arabidopsis Interactome Mapping Consortium
    Science 333, 601 (2011)
    Link | PDF

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    Understanding the demographics of Twitter users
    A. Mislove, S. Lehmann, Y.-Y. Ahn, J.-P. Onnela, and J. N. Rosenquist
    ICWSM’11
    Link | PDF

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    Topological Cluster Analysis Reveals the Systemic Organization of the Caenorhabditis elegans Connectome
    Y. Sohn, M. K. Choi, Y.-Y. Ahn, J. Lee, and J. Jeong
    PLOS Comp. Biol. 7, e1001139 (2011)
    Link | PDF

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    Googling social interactions: Web search engine based social network construction
    S. H. Lee, P.-J. Kim, Y.-Y. Ahn, and H. Jeong
    PLOS ONE 5, e11233 (2010)
    Link | arXiv | PDF | Project page
    NewScientist | georgezaidan:Pocket Science

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    Link communities reveal multiscale complexity in networks
     Y.-Y. Ahn, J. P. Bagrow, and S. Lehmann
    Nature 466, 761 (2010)
    Link | arXiv | PDF | source codes & visualization | Talk slides
    news@Northeastern | 한겨레 사이언스온

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    A blueprint for antimicrobial hit discovery targeting metabolic networks
    Y. Shen, J. Liu, G. Estiu, B. Isin, Y.-Y. Ahn, D.-S. Lee, A.-L. Barabási, V. Kapatral, O. Wiest, and Z. N. Oltvai
    PNAS 107, 1082 (2010)
    Link | PDF

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    Analyzing the video popularity characteristics of large-scale user generated content systems
    M. Cha, H. Kwak, P. Rodriguez, Y.-Y. Ahn, and S. Moon
    ACM/IEEE Transactions on Networking 17, 1357 (2009)
    Link | PDF

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    Comparison of online social relations in terms of volume vs. interaction: a case study of Cyworld
    H. Chun, H. Kwak, Y.-H. Eom, Y.-Y. Ahn, S. Moon, and H. Jeong
    IMC’08
    Link | PDF

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    Impact of the updating scheme on stationary states of networks
    F. Radicchi, Y.-Y. Ahn, and H. Meyer-Ortmanns
    Journal of Physics A: Mathematical and Theoretical 41, 224010 (2008)
    Link | PDF

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    I tube, you tube, everybody tubes: analyzing the world’s largest user generated content video system
    M. Cha, H. Kwak, P. Rodriguez, Y.-Y. Ahn, and S. Moon
    IMC’07 (2007)
    Link | PDF

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    Analysis of Topological Characteristics of Huge Online Social Networking Services
    Y.-Y. Ahn, S. Han, H. Kwak, S. Moon, and H. Jeong
    WWW’07 (2007)
    PDF | Updated & corredted PDF | Data

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    Epidemic dynamics of two species of interacting particles on scale-free networks
    Y.-Y. Ahn, N. Masuda, H. Jeong, and J. D. Noh
    Physical Review E 74, 066113 (2006)
    Link | arXiv | PDF

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    Wiring Cost in the Organization of a Biological Neuronal Network
    Y.-Y. Ahn, B. J. Kim, and H. Jeong
    Physica A 367, 531 (2006)
    Link | arXiv | PDF | Data (pajek) | Probably better wiring data

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    Collaborative blog spam filtering using adaptive percolation search
    S. Han, Y.-Y. Ahn, S. Moon, and H. Jeong
    The 3rd Workshop on the Weblogging Ecosystem held in conjunction with WWW’06 (2006)
    Link | PDF

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    Growing network model for community with group structure
    J. D. Noh, H.-C. Jeong, Y.-Y. Ahn, and H. Jeong
    Physical Review E 71, 036131 (2005)
    Link | arXiv | PDF

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    Underlying scale-free trees in complex networks
    D.-H. Kim, S.-W. Son, Y.-Y. Ahn, P.-J. Kim, Y.-H. Eom, and H. Jeong
    Prog. Theor. Phys. Supplement 157, 213 (2005)
    Link | PDF

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    Response network emerging from simple perturbation
    S.-W. Son, D.-H. Kim, Y.-Y. Ahn, and H. Jeong
    Journal of the Korean Physical Society 44, 628 (2004)
    Link | PDF

Other work

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    Mapping the conversation: political topics and geography on Twitter
    A. Mislove, S. Lehmann, Y.-Y. Ahn, J.-P. Onnela, and J. N. Rosenquist
    Link

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    Flavor network, Edge-Serpentine Gallery exhibition “Maps for the 21st Century”
    Y.-Y. Ahn, S. Ahnert, J. P. Bagrow, and A.-L. Barabási
    Link

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    Pulse of the Nation: visualizing the mood of twitter
    A. Mislove, S. Lehmann, Y.-Y. Ahn, J.-P. Onnela, J. N. Rosenquist
    Project page | YouTube |
    Slashdot | NewScientist | CBS | BBC | NYTimes | and more

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    Twittermood: United States map of mood
    Y.-Y. Ahn, J. P. Bagrow, S. Lehmann, and A. Pawling
    Link