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Harvard Medical School
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# Harvard Medical School

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### News

- [**·**
  Shanghai Jiao Tong University professors Lian Yong and Wang Guoxing's team have made remarkable progress in the field of high-efficiency pulse neural network accelerator chips.](https://english.seiee.sjtu.edu.cn/english/info/36727.htm)
- [**·**
  AI + Urban Science research by AI Institute was selected as cover story in Nature Computational Science!](https://english.seiee.sjtu.edu.cn/english/info/36709.htm)
- [**·**
  The first time in Asia! IPADS's Microkernel Operating System Research Wins the Best Paper Award at SOSP 2023](https://english.seiee.sjtu.edu.cn/english/info/36708.htm)
- [**·**
  Delegation from the Institution of Engineering and Technology Visits the School of Electronic Information and Electrical Engineering for Journal Collaboration](https://english.seiee.sjtu.edu.cn/english/info/36669.htm)
- [**·**
  Associate professor Liangjun Lu and research fellow Jiangbing Du from Shanghai Jiao Tong University made important advancements on large capacity and low power consumption data transmission](https://english.seiee.sjtu.edu.cn/english/info/36645.htm)

### Articulation Points in Complex Networks

**Articulation Points in Complex Networks**

\
**Ph.D.
Yang-Yu Liu**

# Harvard Medical School

**Abstract:**

An articulation point in a
network is a node whose removal disconnects the network. Those nodes play key
roles in ensuring connectivity of many real-world networks, from infrastructure
networks to protein interaction networks and terrorist communication networks.
Despite their fundamental importance, a general framework of studying
articulation points in complex networks is lacking. Here we develop analytical tools to study key
issues pertinent to articulation points, such as the expected number of them
and the network vulnerability against their removal, in an arbitrary complex network. We find that a greedy
articulation point removal process provides us a different perspective on the
organizational principles of complex networks. Moreover, this process results
in a rich phase diagram with two fundamentally different types of percolation
transitions. Our results shed light on the design of more resilient
infrastructure networks and the effective destruction of terrorist communication networks.

# Biography:

**Professor Yang-Yu Liu** is currently an
Assistant Professor of Medicine at Harvard Medical School (HMS) and an
Associate Scientist at Brigham and Women’s Hospital (BWH). He received his
Ph.D. in Physics from University of Illinois at Urbana-Champaign in 2009, with
thesis research focusing on phase transitions in disordered magnets. After
that, he held positions as Postdoctoral Research Associate and then Research
Assistant Professor at the Center for Complex Network Research at Northeastern
University, before he joined HMS and BWH in 2013. The primary goal of his
recent research has been to combine tools from control theory, network science
and statistical physics to address fundamental questions pertaining to the
control of complex networks. His work on controllability and observability of
complex networks have been featured as a cover story in *Nature*, a cover story in the *PNAS*,
and received broad media coverage including *Nature,
Science, ScienceNews, ScienceDaily, Wired*, etc. His current research
efforts focus on developing multidisciplinary approaches for network medicine
and complex diseases. For more information, please visit [*http://scholar.harvard.edu/yyl/*](http://scholar.harvard.edu/yyl/)

[ 2017-06-29 ]

Next page: [Grant-Free Massive Access in 5G IoT](https://english.seiee.sjtu.edu.cn/english/info/13128.htm)

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