Hang-Hyun Jo
@socph.bsky.social
Associate Professor at The Catholic University of Korea; statistical physics and complex systems; co-author of "Bursty Human Dynamics" (Springer, 2018); http://h2jo.xyz; visiting the University of Michigan till February 2027
Accepted for publication in Communications Physics!
Our new preprint is out on arXiv: Hang-Hyun Jo, Naoki Masuda, Modeling non-Poissonian temporal hypergraphs by Markovian node dynamics, arXiv:2604.07694 arxiv.org/abs/2604.07694
Modeling non-Poissonian temporal hypergraphs by Markovian node dynamics
Temporal hypergraphs capture time-resolved group interactions among nodes. Empirical data support that time-stamped group interactions show bursty event sequences and non-trivial temporal correlations...
arxiv.org
September 11, 2026 at 11:32 AM
Accepted for publication in Communications Physics!
Reposted by Hang-Hyun Jo
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.
September 10, 2026 at 6:39 PM
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.
Just in case, academictree.org/physics/tree...
September 3, 2026 at 3:37 PM
Just in case, academictree.org/physics/tree...
Reposted by Hang-Hyun Jo
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
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
August 28, 2026 at 2:50 PM
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
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
"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."
August 21, 2026 at 3:27 PM
"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."
It's been a while to participate in the CCS in person or even online I guess. This time I'm excited to meet other complexity scientists at #CCS2026 and give an oral presentation about temporal hypergraph modeling.
⏳ FINAL 48 HOURS! ⏳
The #CCS2026 early bird registration closes on August 20th! 🗣️🔥
This is your absolute last chance to grab discounted tickets for the premier #ComplexSystems event of the year. 🌎
Don't wait until it's too late—register now! 👇
ccs26.cssociety.org/registration...
The #CCS2026 early bird registration closes on August 20th! 🗣️🔥
This is your absolute last chance to grab discounted tickets for the premier #ComplexSystems event of the year. 🌎
Don't wait until it's too late—register now! 👇
ccs26.cssociety.org/registration...
August 19, 2026 at 6:12 PM
It's been a while to participate in the CCS in person or even online I guess. This time I'm excited to meet other complexity scientists at #CCS2026 and give an oral presentation about temporal hypergraph modeling.
Reposted by Hang-Hyun Jo
⏳ FINAL 48 HOURS! ⏳
The #CCS2026 early bird registration closes on August 20th! 🗣️🔥
This is your absolute last chance to grab discounted tickets for the premier #ComplexSystems event of the year. 🌎
Don't wait until it's too late—register now! 👇
ccs26.cssociety.org/registration...
The #CCS2026 early bird registration closes on August 20th! 🗣️🔥
This is your absolute last chance to grab discounted tickets for the premier #ComplexSystems event of the year. 🌎
Don't wait until it's too late—register now! 👇
ccs26.cssociety.org/registration...
August 18, 2026 at 11:57 AM
⏳ FINAL 48 HOURS! ⏳
The #CCS2026 early bird registration closes on August 20th! 🗣️🔥
This is your absolute last chance to grab discounted tickets for the premier #ComplexSystems event of the year. 🌎
Don't wait until it's too late—register now! 👇
ccs26.cssociety.org/registration...
The #CCS2026 early bird registration closes on August 20th! 🗣️🔥
This is your absolute last chance to grab discounted tickets for the premier #ComplexSystems event of the year. 🌎
Don't wait until it's too late—register now! 👇
ccs26.cssociety.org/registration...
"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?”"
I thought I'd repost this piece quoting the first sentence. Then I thought, no, the first paragraph. No, the first three. And I went on doing that until the final word.
www.theguardian.com/books/ng-int...
www.theguardian.com/books/ng-int...
‘I hate what AI is doing to the minds and happiness of the young’: Katherine Rundell on the view from the classroom
Education is at a crossroads, argues the author and academic. Should we embrace new technology in the name of efficiency, or is it time to fight back?
www.theguardian.com
August 9, 2026 at 2:40 PM
"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?”"
I almost cried in a planetarium watching exotic scenes in other planets and their moons
August 7, 2026 at 3:48 PM
I almost cried in a planetarium watching exotic scenes in other planets and their moons
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".
July 24, 2026 at 1:30 PM
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".
Reposted by Hang-Hyun Jo
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.
July 21, 2026 at 10:03 AM
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.
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.
July 18, 2026 at 7:49 PM
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.
I've never imagined that I'd worry about the air quality in Ann Arbor, until yesterday. Today it's getting worse and worse.
Wildfire smoke can be seen via satellites from the Upper Midwest and Canada, across the Great Lakes and down to New York City. A heat dome is pushing temperatures close to 100 degrees across much of eastern Canada and has prompted alerts about poor air quality. nyti.ms/3RHmZnk
July 16, 2026 at 5:19 PM
I've never imagined that I'd worry about the air quality in Ann Arbor, until yesterday. Today it's getting worse and worse.
An erratum for this paper has been published: doi.org/10.1063/5.03..., thanks to @tlouf.bsky.social and @takayukihir.bsky.social!
July 14, 2026 at 6:02 PM
An erratum for this paper has been published: doi.org/10.1063/5.03..., thanks to @tlouf.bsky.social and @takayukihir.bsky.social!
Reposted by Hang-Hyun Jo
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...
July 4, 2026 at 12:17 PM
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...
sites.google.com/view/rhino20...
"Roles of Heterogeneity In NOn-equilibrium collective dynamics (RHINO2026)", August 28-30, 2026, Yokohama Campus, Meiji Gakuin University, Japan
"Roles of Heterogeneity In NOn-equilibrium collective dynamics (RHINO2026)", August 28-30, 2026, Yokohama Campus, Meiji Gakuin University, Japan
RHINO2026
News
July 6, 2026
Home page open
Registration and abstract submission start
sites.google.com
July 6, 2026 at 3:53 PM
sites.google.com/view/rhino20...
"Roles of Heterogeneity In NOn-equilibrium collective dynamics (RHINO2026)", August 28-30, 2026, Yokohama Campus, Meiji Gakuin University, Japan
"Roles of Heterogeneity In NOn-equilibrium collective dynamics (RHINO2026)", August 28-30, 2026, Yokohama Campus, Meiji Gakuin University, Japan
Oh, I've used "quite some" quite often in my everyday English conversation and didn't know it was not a standard English.
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.
July 3, 2026 at 8:19 PM
Oh, I've used "quite some" quite often in my everyday English conversation and didn't know it was not a standard English.
Reposted by Hang-Hyun Jo
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.
July 3, 2026 at 5:08 PM
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.
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.
Accepted for publication in Scientific Reports! I thank @tibebe12.bsky.social for his hard work.
New arXiv preprint out with my postdoc Tibebe Birhanu @tibebe12.bsky.social on the time series analysis: Analysis framework for higher-order temporal correlations with applications to human heartbeats, arxiv.org/abs/2512.01235
June 25, 2026 at 2:20 PM
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.
Reposted by Hang-Hyun Jo
Reposted by Hang-Hyun Jo
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.
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.
June 9, 2026 at 12:05 PM
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.
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.
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.
A Theory of Medical Science, Complexity as the Measurement for Health
YouTube video by Labfront
www.youtube.com
June 4, 2026 at 1:54 PM
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.