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Hang-Hyun Jo

@socph.bsky.social
386 followers 455 following 264 posts

Associate Professor at The Catholic University of Korea; statistical physics and complex systems; co-author of "Bursty Human Dynamics" (Springer, 2018); h2jo.xyz; visiting University of Michigan

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Hang-Hyun Jo @socph.bsky.social · 03/10/2026
Today’s bluesky
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Anxo Sánchez @anxo.eurosky.social · 25/09/2026
The new journal of the @cssociety.bsky.social, TOCSS, is almost out! Website is already alive and working at tocss.cssociety.org We expect to publish an exciting inaugural issue with research papers and perspectives from leading members of the community it by the end of the year, so stay tuned!
tocss.cssociety.org
Transactions of the Complex Systems Society
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Hang-Hyun Jo @socph.bsky.social · 30/09/2026
Random walk problem by Pearson www.nature.com/articles/072...
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Alec Kirkley @captainkirk1041.bsky.social · 29/09/2026
Excited for NetSci-X 2027 in Hong Kong! Send your abstracts by Oct 1st (possible deadline extension coming soon), and see netscix2027.github.io for more details.
netscix2027.github.io
NetSciX 2027 — International School and Conference on Network Science
NetSciX 2027 — International School and Conference on Network Science. January 24–27, 2027, Hong Kong SAR.
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Gahyoun Gim @dotchgahyoun.bsky.social · 22/09/2026
연구실 친구들의 관심사(모빌리티, 도심안전지표)와 도메인(네트워크)을 융합하여서, 인공지능 기반의 순찰 에이전트봇 디지털 트윈을 구현해 보았고 이번 과학치안 아이디어 공모전에 투고 및 발표한 결과, 국민(시민)부분에서 우수상을 수상하였습니다 👏👏👏 kipot.or.kr/user/ex19.do
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Hang-Hyun Jo @socph.bsky.social · 13/09/2026
aiandeducation.mit.edu
aiandeducation.mit.edu
AI and Education – Report of MIT’s Ad Hoc Committee on AI Use in Teaching, Learning, and Research Training
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Hang-Hyun Jo @socph.bsky.social · 11/09/2026
Accepted for publication in Communications Physics!
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Helen Czerski @helenczerski.bsky.social · 10/09/2026
It bugs me that we're normalising the idea that there's something wrong with long documents, or that they're not "worth" our time. There is huge value in careful thought, in detail and nuance, in exploration, and in the experiential journey that goes alongside that.
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Hang-Hyun Jo @socph.bsky.social · 03/09/2026
Just in case, academictree.org/physics/tree...
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Ann Arbor District Library @aadl.org · 28/08/2026
Celebrate Korea Week at AADL Sept. 28-Oct. 4, packed full of Korean culture, crafts, cuisine, and more! Korea Week is held in partnership with the University of Michigan Nam Center for Korean Studies and the Korean Cultural Center of Washington D.C. → aadl.org/koreaweek
Poster for a "Korean Games & Crafts for Kids" event featuring traditional Korean patterns and colors. Includes bold green text that lists details alongside logos for AADL, Nam Center for Korean Studies, and the Korean Cultural Center in Washington, D.C.Poster for "The Beauty of Hanbok" event featuring traditional Korean patterns and colors. Includes bold purple text that lists details alongside logos for AADL, Nam Center for Korean Studies, and the Korean Cultural Center in Washington, D.C.Poster for a "Korean Ink Wash Painting Workshop" event featuring traditional Korean patterns and colors. Includes bold blue text that lists details alongside logos for AADL, Nam Center for Korean Studies, and the Korean Cultural Center in Washington, D.C.Poster for a "Korean Food" event featuring traditional Korean patterns and colors. Includes bold orange text that lists details alongside logos for AADL, Nam Center for Korean Studies, and the Korean Cultural Center in Washington, D.C.
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Hang-Hyun Jo @socph.bsky.social · 21/08/2026
- Toni Morrison, Tar Baby www.goodreads.com/quotes/33794...
goodreads.com
A quote from Tar Baby
At some point in life the world's beauty becomes enough. You don't need to photograph, paint or even remember it. It is enough. No record of it needs to ...
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Hang-Hyun Jo @socph.bsky.social · 21/08/2026
"At some point in life the world's beauty becomes enough. You don't need to photograph, paint or even remember it. It is enough. No record of it needs to be kept and you don't need someone to share it with or tell it to. When that happens — that letting go — you let go because you can."
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Hang-Hyun Jo @socph.bsky.social · 09/08/2026
"To write is not just to transcribe the mind’s ideas; it’s a form of transformation, turning a nascent, half-built thought into something sturdier, tougher, sharper. EM Forster wrote: “How do I know what I think until I see what I say?”"
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Hang-Hyun Jo @socph.bsky.social · 07/08/2026
I almost cried in a planetarium watching exotic scenes in other planets and their moons
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Hang-Hyun Jo @socph.bsky.social · 29/07/2026
brunch.co.kr/@socph/30
brunch.co.kr
동적네트워크 개념정리
21세기 네트워크과학이 시작했을 때 주어진 데이터는 보통 정적네트워크였다. 또는 시간정보가 있는 경우에도 이를 무시한 정적네트워크로 바꾸어 연구하곤 했다. 하지만 정적네트워크 연구가 성숙해지고 시간정보가 포함된 네트워크 데이터도 많아지면서 2010년대 들어 동적네트워크 연구가 떠올랐다. 사실 네트워크를 연구하는 물리학자들은 구조 자체보다도 동역학에 관심이
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Hang-Hyun Jo @socph.bsky.social · 27/07/2026
brunch.co.kr/@socph/29
brunch.co.kr
하이퍼그래프 논란
지금까지 네트워크라고 하면 두 노드 사이의 상호작용을 링크로 표현한 것을 주로 가리켰다. 하지만 실제 현상들을 보면 둘보다 많은 노드들이 '동시에' 상호작용하는 경우도 있다. 이를테면 셋이나 네명의 연구자가 모여서 같이 논문을 쓰는 일이 그렇다. 이렇게 둘보다 많은 노드들의 상호작용을 어떻게 네트워크로 공부할 수 있을까. 그래서 나온 답이 하이퍼그래프(hy
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Hang-Hyun Jo @socph.bsky.social · 24/07/2026
After a couple of weeks of heatwave in Ann Arbor, now it feels like a Finnish summer. Several years ago, when I visited Aalto University in summer, I had to buy a "summer jacket".
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Hang-Hyun Jo @socph.bsky.social · 23/07/2026
Here is the original paper of the burst-tree method: www.nature.com/articles/s41...
nature.com
Burst-tree decomposition of time series reveals the structure of temporal correlations - Scientific Reports
Scientific Reports - Burst-tree decomposition of time series reveals the structure of temporal correlations
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Hang-Hyun Jo @socph.bsky.social · 23/07/2026
When I developed the idea of burst-tree method with Takayuki @takayukihir.bsky.social and Mikko @bolozna.bsky.social in 2019-2020, we still didn't know what to do with it. Now this paper with Tibebe @tibebe12.bsky.social shows one possible application of our burst-tree method. I expect to see more.
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Hang-Hyun Jo @socph.bsky.social · 23/07/2026
Finally my paper was assigned the volume and article number, after two months! www.nature.com/articles/s41... Coincidently, the article number contains my birth year and day, and the second digit of my birth month (if it's counted).
nature.com
Analysis framework for higher-order temporal correlations with applications to human heartbeats - Scientific Reports
Scientific Reports - Analysis framework for higher-order temporal correlations with applications to human heartbeats
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American Statistical Association History of Statistics @hos-asa.bsky.social · 21/07/2026
Few statisticians know that Frank Yates, pioneer of experimental design, is responsible for the annoying practice of indicating 3 tiers of statistical significance by stars (*p ≤ 0.05, **p ≤0.01, ***p ≤ 0.001). He soon regretted it and “vehemently opposed its unthinking use”. And here we are.
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Hang-Hyun Jo @socph.bsky.social · 18/07/2026
All of sudden, I wondered why the number of neighbors of a node in networks is called a "degree". In the original paper by Erdos and Renyi (1960), I found a sentence: "The number of edges starting from the point P of a graph G will be called the degree of P in G." But without any explanation.
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Hang-Hyun Jo @socph.bsky.social · 16/07/2026
I've never imagined that I'd worry about the air quality in Ann Arbor, until yesterday. Today it's getting worse and worse.
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Hang-Hyun Jo @socph.bsky.social · 14/07/2026
An erratum for this paper has been published: doi.org/10.1063/5.03..., thanks to @tlouf.bsky.social and @takayukihir.bsky.social!
doi.org
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Ricard Solé @ricardsole.bsky.social · 04/07/2026
How can an extremely simple equation open the door to virtually infinite complexity? Fifty years ago, Bob May’s classic paper in @nature.com on chaos showed how deterministic rules can generate unpredictability, with deep implications for ecology, physics & beyond. mym.iimas.unam.mx/ramon/docs/M...
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Hang-Hyun Jo @socph.bsky.social · 06/07/2026
sites.google.com/view/rhino20... "Roles of Heterogeneity In NOn-equilibrium collective dynamics (RHINO2026)", August 28-30, 2026, Yokohama Campus, Meiji Gakuin University, Japan
sites.google.com
RHINO2026
News July 6, 2026 Home page open Registration and abstract submission start
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Hang-Hyun Jo @socph.bsky.social · 04/07/2026
Thank you for your explanation!
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Hang-Hyun Jo @socph.bsky.social · 03/07/2026
Oh, I've used "quite some" quite often in my everyday English conversation and didn't know it was not a standard English.
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Philip Ball @philipcball.bsky.social · 03/07/2026
I'd go further: if we native English speakers expect English to be the lingua franca (ha!) of most of the world, everyone who uses it gets to influence how it evolves. Phrases that aren't standard English, like "quite some" and "allows to", are then no longer really "wrong" at all.
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Hang-Hyun Jo @socph.bsky.social · 25/06/2026
Why does it take so long to get the volume and pages for the accepted paper in Scientific Reports? I need such information for the process in my university.
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The Ill @the-ill.bsky.social · 17/06/2026
Anakin&Padme 4 panel meme, with Anakin announcing “We’re using AI instead of biased humans”. Palme asks “What did you train the AI on?”. Anakin looks on blankly. Palme repeats, “What did you train the AI on?”
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Taha Yasseri @tahayasseri.bsky.social · 09/06/2026
Chapter 15: @kristinalerman.bsky.social on the Strong Friendship Paradox. Showing how the structure of social networks systematically biases our perceptions of reality. When our friends are not representative of the population, rare behaviours and opinions can appear surprisingly common.
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Hang-Hyun Jo @socph.bsky.social · 04/06/2026
Since I got to know the MSE, I've wondered the mathematical relation between MSE and autocorrelation function (ACF) because both measure long-term temporal correlations. Of course they're different; the MSE is based on the entropy, while the ACF is not. I guess there must be some work on this topic.
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Hang-Hyun Jo @socph.bsky.social · 04/06/2026
I summarized such connections in my paper: arxiv.org/abs/1709.05150
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Hang-Hyun Jo @socph.bsky.social · 04/06/2026
Complexity in time series were measured using various methods. Interestingly many of them show power-law behaviors. It's been known that the power-law exponents of power spectral density, autocorrelation function and Hurst exponent (which is itself a power-law exponent) are all connected.
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Hang-Hyun Jo @socph.bsky.social · 04/06/2026
I learned the Detrended Fluctuation Analysis (DFA) in the lecture on econophysics at KAIST in 2006, leading to a JKPS paper. And I coauthored a PLOS ONE paper in 2021 (doi.org/10.1371/jour...) where we applied the multiscale entropy (MSE) method to the temporal network time series data.
doi.org
Impact of environmental changes on the dynamics of temporal networks
Dynamics of complex social systems has often been described in the framework of temporal networks, where links are considered to exist only at the moment of interaction between nodes. Such interaction...
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Hang-Hyun Jo @socph.bsky.social · 04/06/2026
www.youtube.com/watch?v=MwFe... Yesterday I happened to watch Prof. C.-K. Peng's lecture video. He developed the DFA and MSE, etc. with his colleagues.
youtube.com
A Theory of Medical Science, Complexity as the Measurement for Health
YouTube video by Labfront
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Hang-Hyun Jo @socph.bsky.social · 03/06/2026
brunch.co.kr/@socph/22
brunch.co.kr
국제네트워크과학회 2026
지금 미국 보스턴에서는 국제네트워크과학회(NetSci2026)가 열리고 있다. 정식 명칭은 International School & Conference on Network Science이며 줄여서 넷싸이(NetSci)라고도 부른다. 사실 참석하고 싶었지만 사정이 있어 가지 못했다. 2006년에 처음 열렸고 올해가 20주년이다. SNS에 실시간으로 올라온 학
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Hiroki Sayama @hirokisayama.bsky.social · 03/06/2026
Alex Vespignani officially opening #NetSci2026, reviewing the history of this community's growth This year, 800 people came together!! @netscisociety.bsky.social @netsciconf.bsky.social
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Hang-Hyun Jo @socph.bsky.social · 26/05/2026
Our new preprint is out on arXiv: Jiyoung Kang, Hang-Hyun Jo, Naoki Masuda, Quantifying concurrency in event-based temporal network and hypergraph data arxiv.org/abs/2605.24633
arxiv.org
Quantifying concurrency in event-based temporal network and hypergraph data
Many social, biological, and technological systems are recorded as sequences of time-stamped interactions. In such systems, concurrency, i.e., the tendency for an individual to participate in multiple...
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Hang-Hyun Jo @socph.bsky.social · 20/05/2026
We introduced two novel measures regarding the higher-order IET correlations; combining the burstiness and memory coefficient with these two novel measures, we applied the support vector machine (SVM) to distinguish healthy people from those with heart diseases, quite well.
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Hang-Hyun Jo @socph.bsky.social · 20/05/2026
these results already showed distinct behaviors between healthy people and those with heart diseases (CHF and AF). We extended our analysis to the higher-order IET correlations, for which we adopted the burst-tree decomposition method (Jo et al., 2020: www.nature.com/articles/s41...).
nature.com
Burst-tree decomposition of time series reveals the structure of temporal correlations - Scientific Reports
Scientific Reports - Burst-tree decomposition of time series reveals the structure of temporal correlations
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Hang-Hyun Jo @socph.bsky.social · 20/05/2026
In our now-accepted paper, we analyzed more than 200 people's heartbeat time series, publicly available at physionet.org. We focused on the inter-event times (IETs, equivalent to RR intervals) for the analysis, e.g., we measured the burstiness and memory coefficient between two IETs:
physionet.org
PhysioNet
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Conference on Complex Systems @css-conference.bsky.social · 20/05/2026
Balancing research and family life doesn't have to be a dilemma! 👶 If you are planning to attend #CCS2026 and need on-site childcare services, please reach out to stulkjesso@binghamton.edu with the email subject line: "Childcare for CCS".
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Hang-Hyun Jo @socph.bsky.social · 19/05/2026
Accepted for publication in Scientific Reports! I thank @tibebe12.bsky.social for his hard work.
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Hang-Hyun Jo @socph.bsky.social · 19/05/2026
Our new paper is out on the arXiv: Yeonji Seo, Mi Jin Lee, Seung-Woo Son, Hang-Hyun Jo, Yohsuke Murase, Editorial Trajectories in Wikipedia Reflect Underlying Hyperlink Structure, arxiv.org/abs/2605.16850
arxiv.org
Editorial Trajectories in Wikipedia Reflect Underlying Hyperlink Structure
Wikipedia hyperlinks have primarily been studied as navigational tools for readers, but their role in how information providers move between articles during editing remains less explored. Here, we com...
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Hang-Hyun Jo @socph.bsky.social · 25/04/2026
FYI brunch.co.kr/@socph/16
brunch.co.kr
친구관계 역설 이야기
왜 친구들은 나보다 더 친구가 많고 더 잘났을까? | 친구관계 역설은 영어로 friendship paradox를 옮긴 것이다. 우정 역설 또는 친구수 역설로 번역되는 경우도 있다. 이 역설은 사회학자 스캇 펠드가 미국의 한 고등학교 학생들 사이의 친구관계를 조사하면서 1991년에 처음 제안한 개념인데, 사회연결망 내에서 "내 친구는 평균적으로 나보다 더 많...
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Hang-Hyun Jo @socph.bsky.social · 23/04/2026
Spring is coming slowly but surely (or summer?)
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Sang Hoon Lee @lshlj.bsky.social · 14/04/2026
the final decision: not included in the program at all
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Hang-Hyun Jo @socph.bsky.social · 10/04/2026
abstract submitted to CCS 2026 ccs26.cssociety.org
ccs26.cssociety.org
CCS 2026: The 2026 Conference on Complex Systems @ Binghamton, NY, USA
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