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Department of Media and Communication Center for Communication Research

Dr Xiaofan LIU 劉肖凡

BSc, PhD (HK PolyU)

Assistant Professor

Staff Photo

Contact Information

Office: M5083
Phone: +(852) 3442 8730
Fax: +(852) 3442 0228
Email: xf.liu@cityu.edu.hk
Website:
Personal CV: Personal CV
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Academic Profile

CityU Scholar

Research Interests

  • Cryptocurrency and the Darknet
I received my Bachelor of Science degree in Internet and multimedia technologies and the Ph.D. degree in network science from the Hong Kong Polytechnic University. Before joining CityU, I was an associate professor and the head of the Computer Engineering Department at Southeast University, Nanjing, China. Now I am also affiliated with the Web Mining Lab, which is housed inside the Department of Media and Communication.

I have two lines of research interests:

The Darknet. It is a set of computer servers connected by and can only be accessed from encrypted networks. A common impression associated with the Darknet is drug trading. But there are much more fun (and not that fun) stuffs going on in that corner of the Internet. The Darknet can be considered as an anonymous communication channel from the perspective of the 5W communication theory, offering a unique chance to study human behaviors in an extremely covert environment.

Cryptocurrency transaction analysis. Cryptocurrencies, such as Bitcoin, are the de facto standard payment medium in the Darknet. Other than payments, cryptocurrencies are also used in various (mostly illicit) scenarios, such as (fraudulent) fundraising, speculating, and money laundering. However, all cryptocurrencies' transaction records are publicly available -- therefore unfolding a panorama of human financial behavior in the cryptocurrency economic body.

You are welcome to join our lab or collaborate with us if interested in these research topics. Leave a message, and I will get back to you. Cheers!


Research on the Darknet

Academic papers

  • Z.-C. Chen, E. Jardine, and X.F. Liu*, "Examining the Information Pathways Leading to the Darknet: A Cross-National Analysis," ICA2021, accepted.
  • Z.-C. Chen and X.F. Liu*, "Why Do Users Leave Anonymous Online Communities? An Exploratory Study of the Silk Road Forum on the Dark Web," ICA2021, accepted.
  • * corresponding author

Research on cryptocurrency and blockchain

Talks and thoughts


Academic papers

  • X.F. Liu*, X.-J. Jiang, S.-H. Liu, and C.K. Tse, "Knowledge Discovery in Cryptocurrency Transactions: A Survey," arXiv preprint arXiv:2010.01031 (2020). arXiv.
  • S.-H. Liu and X.F. Liu*, "Co-investment Network of ERC20 tokens: network structure versus market performance," Frontiers in Physics (in revision).
  • X.J. Jiang and X.F. Liu*, "CryptoKitties transaction network analysis:the rise and fall of the first blockchain game mania," Frontiers in Physics (in revision).
  • Y.-H. Zhang and X.F. Liu*, "Traffic Redundancy in Blockchain Systems: The Impact of Logical and Physical Network Structures," (submitted).
  • X.F. Liu* and H.-H. Ren, "Characterizing key agents in the cryptocurrency economy through blockchain transaction analysis," EPJ Data Science, (in revision).
  • Zhang, Y-H., & Liu, X. F.* (2020). Satellite Broadcasting Enabled Blockchain Protocol: A Preliminary Study. In 2020 Information Communication Technologies Conference (ICTC 2020) (pp. 118-124). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/ICTC49638.2020.9123248
  • 张颖浩、刘肖凡*,“卫星广播网络环境下区块链协议的初步研究,”西安电子科技大学学报,2020(5): 11-18+27. Publisher
  • Liu, X. F.*, Lin, Z. X., & Han, X. P. (2019). Homogeneity and heterogeneity of cryptocurrencies. arXiv preprint arXiv:1910.01330.
  • 林增贤、刘肖凡*,“追踪比特币新币走向:一种基于交易网络结构特征识别矿工的方案,”南京信息工程大学学报(自然科学版),2018(4): 450-455. Publisher, arXiv
  • * corresponding author

Research on the COVID-19 pandemic

Academic papers

  • X.F. Liu, X.-K. Xu*, and Y. Wu*, "Mobility, exposure, and epidemiological timelines of COVID-19 infections in China outside Hubei Province," Scientific Data (in revision). Pre-print
  • Xu, X-K.+, Liu, X-F.+, Wu, Y.+, Ali, S. T.+, Du, Z.+, Bosetti, P., Lau, E. H. Y., Cowling, B. J., & Wang, L.* (2020). Reconstruction of Transmission Pairs for novel Coronavirus Disease 2019 (COVID-19) in mainland China: Estimation of Super-spreading Events, Serial Interval, and Hazard of Infection. Clinical Infectious Diseases. https://doi.org/10.1093/cid/ciaa790
  • H.C. Sun+, X.F. Liu+, Z. Du, and X.-K. Xu*, "Mitigating COVID-19 transmission in schools with digital contact tracing," (under review)
  • L. Zhang, H. Wang, Z. Liu, X.F. Liu*, X. Feng*, and Y. Wu*, "An age-dependent branching process with immigration for the COVID-19 spreading in local communities in China," (under review).
  • L. Zhang, J. Zhu, X. Wang, J. Yang, X.F. Liu*, and X.-K. Xu*, "Characterizing COVID-19 transmission: incubation period, reproduction rate, and multiple-generation spreading," Front. Phys. 8: 589963 (2021). Publisher
  • H.-C. Sun, X.F. Liu, X.-K. Xu*, and Y. Wu*, "Analysis of COVID-19 Spreading and Prevention Strategy in Schools Based on Continuous Infection Model," Acta Physica Sinica (物理学报), 69(24): 240201 (2020). Publisher
  • W.-J. Cao, X.-F. Liu, Z. Han, X. Feng*, L. Zhang*, X.F. Liu, X.-K. Xu, and Y. Wu, "Statistical analysis and autoregressive modeling of confirmed coronavirus disease 2019 epidemic cases," Acta Physica Sinica (物理学报) 69(9): 090203 (2020). Publisher
  • 刘肖凡*, 吴晔, & 许小可 (2020). 媒体在流行病暴发事件中的干预作用: 基于传染病模型理论和新型冠状病毒疫情案例的分析. 全球传媒学刊, 7(1), 169-185. https://doi.org/10.16602/j.gmj.20200011
  • + equally contributed, * corresponding author

Teaching

Publications

Monograph

  • 刘肖凡, & 谢智刚 (2015). 知诸网: 网络科学及其在艺术、金融和社会学中的应用. 科学出版社, 北京.

Selected Articles

  • Liu, X. F.*, Chen, H-J., & Sun, W-J. (2021). Adaptive topological coevolution of interdependent networks: Scientific collaboration-citation networks as an example. Physica A: Statistical Mechanics and its Applications, 564, [125518]. https://doi.org/10.1016/j.physa.2020.125518
  • Zhang, Y-H., & Liu, X. F.* (2020). Satellite Broadcasting Enabled Blockchain Protocol: A Preliminary Study. In 2020 Information Communication Technologies Conference (ICTC 2020) (pp. 118-124). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/ICTC49638.2020.9123248
  • 刘肖凡*, 吴晔, & 许小可 (2020). 媒体在流行病暴发事件中的干预作用: 基于传染病模型理论和新型冠状病毒疫情案例的分析. 全球传媒学刊, 7(1), 169-185. https://doi.org/10.16602/j.gmj.20200011
  • Liu, X. F.*, Liu, Y-L., Lu, X-H., Wang, Q-X., & Wang, T-X. (2016). The anatomy of the global football player transfer network: Club functionalities versus network properties. PLoS ONE, 11(6), [e0156504]. https://doi.org/10.1371/journal.pone.0156504
  • Liu, X. F.*, Tse, C. K., & Small, M. (2010). Complex network structure of musical compositions: Algorithmic generation of appealing music. Physica A: Statistical Mechanics and its Applications, 389(1), 126-132. https://doi.org/10.1016/j.physa.2009.08.035
  • * corresponding author

Google/CityU Scholar pages


Patents

  • 刘肖凡、李正龙,“群组间消息传播路径挖掘方法与系统”,中国发明,专利号 ZL 2017 1 01154048.7
  • 刘肖凡、李正龙,“一种基于在线社交平台群聊数据对群成员进行关联的系统及方法”,中国发明,专利号 ZL 2016 1 0482435.3
  • 庆光蔚、王会方、丁树庆、冯月贵、刘肖凡、高逸夫、胡静波、冯文龙、韩郡业、张军、米涌、王建华、梁秉、方铭杰,“一种基于最小加权时间距离的电梯救援站点最优选址方法”,中国发明,专利号 ZL 2017 1 0236990.2
  • 蔡成委、韦志群、刘肖凡,“一种基于用户画像动态轨迹模型的广告推荐方法及系统”,中国发明,公开号 CN108665083A,公开日2018年10月16日。