iiinova — where your digital self keeps evolving

Hang-Hyun Jo @socph.bsky.social · 30/09/2026

Random walk problem by Pearson www.nature.com/articles/072...

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Hang-Hyun Jo @socph.bsky.social · 03/09/2026

Just in case, academictree.org/physics/tree...

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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 · 08/04/2026

I just found that in their IJMPC paper in 2017, Fu & Wu copied the first paragraph of our paper (Eom & Jo, Sci. Rep. 2014) without any modifications. Wow, so brave.

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Hang-Hyun Jo @socph.bsky.social · 02/12/2025

I've got the message that the abstract submission opened.

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Hang-Hyun Jo @socph.bsky.social · 19/11/2025

www.complexity.kr?p=1336 I learned that there'll be the Korea Academy of Complexity Studies Conference on December 6. The topic is the AI and complex systems.

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Hang-Hyun Jo @socph.bsky.social · 30/08/2025

I just copied the poster of the workshop, which looks interesting.

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Hang-Hyun Jo @socph.bsky.social · 12/08/2025

Attending the summer school on nonlinear dynamics and chaos at KIAS

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Hang-Hyun Jo @socph.bsky.social · 10/06/2025

www.complexity.kr?p=1322 I'm pleased to join the 2025 KACS-KENTECH Summer School on Complex Systems as a lecturer with other 7 lecturers. This year we study the Korean translation of the famous book "Nonlinear Dynamics and Chaos" by Steven Strogatz. All lectures are given in Korean too.

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Hang-Hyun Jo @socph.bsky.social · 29/11/2024

I took this video last summer at Aalto University, Finland.

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Hang-Hyun Jo @socph.bsky.social · 16/11/2024

If you see this, please repost with a favourite photo of the sky that you’ve taken recently

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Hang-Hyun Jo @socph.bsky.social · 10/11/2024

Patterns of the civilization

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Hang-Hyun Jo @socph.bsky.social · 10/11/2024

No photos about the workshop but a few about Okinawa.

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Hang-Hyun Jo @socph.bsky.social · 28/10/2024

I just made a slide showing the flowchart for the derivation of the autocorrelation function from the inter-event time and burst size distributions.

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Hang-Hyun Jo @socph.bsky.social · 28/10/2024

Four years ago I proposed the burst-tree decomposition method with Takayuki and Mikko (www.nature.com/articles/s41...). It was shown that the event sequence (lower part of the figure) can be mapped to the binary tree structure (upper), each node is a bursty train detected at the timescale Δt.

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Hang-Hyun Jo @socph.bsky.social · 28/06/2024

Attending now the symposium on nonlinear and complex systems

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Hang-Hyun Jo @socph.bsky.social · 28/05/2024

Today’s bluesky with clouds

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Hang-Hyun Jo @socph.bsky.social · 29/04/2024

Thus, in their model β is infinite. Our solution is for any β, finally completing the picture in the figure.

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Hang-Hyun Jo @socph.bsky.social · 29/04/2024

For this, we devised a simple model generating time series with any functional forms of IET and burst-size distributions (see Figure). Then we derived the ACF for this model. Finally, assuming that IET and burst-size distributions are power laws, we obtained the ACF, hence the decay exponent.

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Hang-Hyun Jo @socph.bsky.social · 29/04/2024

It's because the autocorrelation function (ACF) measures "all" temporal correlations in time series, while inter-event times (IETs) and burst sizes reveal only some "part" of those correlations. Now we have the answer.

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Hang-Hyun Jo @socph.bsky.social · 29/04/2024

Figure from link.springer.com/chapter/10.1... Let's begin with the following figure, where the decay exponent γ of the autocorrelation function A must be a function of the power-law exponent α of inter-event time distribution P and the power-law exponent β of burst-size distribution, i.e., γ(α, β).

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Hang-Hyun Jo @socph.bsky.social · 14/11/2023

Finally published online, see link.springer.com/article/10.1... However, I have to complain about the proofreading process; I've never seen two-column captions for single column figures. We already asked to correct these but the paper was published without fixing this issue.

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Hang-Hyun Jo @socph.bsky.social · 27/10/2023

Now attending the Korean Physical Society Fall Meeting, StatPhys session.

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Hang-Hyun Jo @socph.bsky.social · 25/08/2023

Blue sky with white clouds

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Hang-Hyun Jo @socph.bsky.social · 31/07/2023

The attached figure essentially summarizes my academic network for the last ~20 years. Thank you for all. Source: Pure by Elsevier

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Hang-Hyun Jo @socph.bsky.social · 26/05/2023

Our new paper is out on arXiv! Oh-Hyun Kwon, Inho Hong, Woo-Sung Jung, Hang-Hyun Jo, "Multiple gravity laws for human mobility within cities" (arxiv.org/abs/2305.15665).

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Hang-Hyun Jo @socph.bsky.social · 15/05/2023

www.complexity.kr/?p=1211 The Korea Academy of Complexity Studies organizes a summer school on complexity. The topic of this year's school is Network Science. The lectures (in Korean) are based on two recently translated books on network science.

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Hang-Hyun Jo @socph.bsky.social · 04/05/2023

We also translated M.E.J. Newman's book "Networks (2nd Ed.)" last year.

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Hang-Hyun Jo @socph.bsky.social · 04/05/2023

Recently I joined a group of Korean network scientists to translate Barabasi’s book “Network Science” into Korean. I got a copy from the publishing company.

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