Reposted by Hang-Hyun JoAnxo Sánchez @anxo.eurosky.social · 25/09/2026The 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 0157
Hang-Hyun Jo @socph.bsky.social · 30/09/2026Random walk problem by Pearson www.nature.com/articles/072... 010
Reposted by Hang-Hyun JoAlec Kirkley @captainkirk1041.bsky.social · 29/09/2026Excited 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.ioNetSciX 2027 — International School and Conference on Network ScienceNetSciX 2027 — International School and Conference on Network Science. January 24–27, 2027, Hong Kong SAR. 028
Reposted by Hang-Hyun JoGahyoun Gim @dotchgahyoun.bsky.social · 22/09/2026연구실 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 137
Hang-Hyun Jo @socph.bsky.social · 13/09/2026aiandeducation.mit.eduaiandeducation.mit.eduAI and Education – Report of MIT’s Ad Hoc Committee on AI Use in Teaching, Learning, and Research Training 001
Reposted by Hang-Hyun JoHelen Czerski @helenczerski.bsky.social · 10/09/2026It 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. 6784106
Reposted by Hang-Hyun JoAnn Arbor District Library @aadl.org · 28/08/2026Celebrate 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 151
Hang-Hyun Jo @socph.bsky.social · 21/08/2026- Toni Morrison, Tar Baby www.goodreads.com/quotes/33794...goodreads.comA quote from Tar BabyAt 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 ... 000
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." 100
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?”" 000
Hang-Hyun Jo @socph.bsky.social · 07/08/2026I almost cried in a planetarium watching exotic scenes in other planets and their moons 000
Hang-Hyun Jo @socph.bsky.social · 29/07/2026brunch.co.kr/@socph/30brunch.co.kr동적네트워크 개념정리21세기 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 000
Hang-Hyun Jo @socph.bsky.social · 27/07/2026brunch.co.kr/@socph/29brunch.co.kr하이퍼그래프 논란지금까지 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 000
Hang-Hyun Jo @socph.bsky.social · 24/07/2026After 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". 020
Hang-Hyun Jo @socph.bsky.social · 23/07/2026Here is the original paper of the burst-tree method: www.nature.com/articles/s41...nature.comBurst-tree decomposition of time series reveals the structure of temporal correlations - Scientific ReportsScientific Reports - Burst-tree decomposition of time series reveals the structure of temporal correlations 000
Hang-Hyun Jo @socph.bsky.social · 23/07/2026When 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. 100
Hang-Hyun Jo @socph.bsky.social · 23/07/2026Finally 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.comAnalysis framework for higher-order temporal correlations with applications to human heartbeats - Scientific ReportsScientific Reports - Analysis framework for higher-order temporal correlations with applications to human heartbeats 121
Reposted by Hang-Hyun JoAmerican Statistical Association History of Statistics @hos-asa.bsky.social · 21/07/2026Few 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. 112954
Hang-Hyun Jo @socph.bsky.social · 18/07/2026All 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. 010
Hang-Hyun Jo @socph.bsky.social · 16/07/2026I've never imagined that I'd worry about the air quality in Ann Arbor, until yesterday. Today it's getting worse and worse. 000
Hang-Hyun Jo @socph.bsky.social · 14/07/2026An erratum for this paper has been published: doi.org/10.1063/5.03..., thanks to @tlouf.bsky.social and @takayukihir.bsky.social!doi.org 010
Reposted by Hang-Hyun JoRicard Solé @ricardsole.bsky.social · 04/07/2026How 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... 413337
Hang-Hyun Jo @socph.bsky.social · 06/07/2026sites.google.com/view/rhino20... "Roles of Heterogeneity In NOn-equilibrium collective dynamics (RHINO2026)", August 28-30, 2026, Yokohama Campus, Meiji Gakuin University, Japansites.google.comRHINO2026News July 6, 2026 Home page open Registration and abstract submission start 010
Hang-Hyun Jo @socph.bsky.social · 03/07/2026Oh, I've used "quite some" quite often in my everyday English conversation and didn't know it was not a standard English. 100
Reposted by Hang-Hyun JoPhilip Ball @philipcball.bsky.social · 03/07/2026I'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. 4379
Hang-Hyun Jo @socph.bsky.social · 25/06/2026Why 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. 100
Reposted by Hang-Hyun JoTaha Yasseri @tahayasseri.bsky.social · 09/06/2026Chapter 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. 211
Hang-Hyun Jo @socph.bsky.social · 04/06/2026Since 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. 010
Hang-Hyun Jo @socph.bsky.social · 04/06/2026I summarized such connections in my paper: arxiv.org/abs/1709.05150 100
Hang-Hyun Jo @socph.bsky.social · 04/06/2026Complexity 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. 100
Hang-Hyun Jo @socph.bsky.social · 04/06/2026I 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.orgImpact of environmental changes on the dynamics of temporal networksDynamics 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... 100
Hang-Hyun Jo @socph.bsky.social · 04/06/2026www.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.comA Theory of Medical Science, Complexity as the Measurement for HealthYouTube video by Labfront 101
Hang-Hyun Jo @socph.bsky.social · 03/06/2026brunch.co.kr/@socph/22brunch.co.kr국제네트워크과학회 2026지금 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 021
Reposted by Hang-Hyun JoHiroki Sayama @hirokisayama.bsky.social · 03/06/2026Alex Vespignani officially opening #NetSci2026, reviewing the history of this community's growth This year, 800 people came together!! @netscisociety.bsky.social @netsciconf.bsky.social 052
Hang-Hyun Jo @socph.bsky.social · 26/05/2026Our 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/2605.24633arxiv.orgQuantifying concurrency in event-based temporal network and hypergraph dataMany 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... 054
Hang-Hyun Jo @socph.bsky.social · 20/05/2026We 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. 000
Hang-Hyun Jo @socph.bsky.social · 20/05/2026these 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.comBurst-tree decomposition of time series reveals the structure of temporal correlations - Scientific ReportsScientific Reports - Burst-tree decomposition of time series reveals the structure of temporal correlations 100
Hang-Hyun Jo @socph.bsky.social · 20/05/2026In 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 110
Reposted by Hang-Hyun JoConference on Complex Systems @css-conference.bsky.social · 20/05/2026Balancing 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". 056
Hang-Hyun Jo @socph.bsky.social · 19/05/2026Accepted for publication in Scientific Reports! I thank @tibebe12.bsky.social for his hard work. 010
Hang-Hyun Jo @socph.bsky.social · 19/05/2026Our 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/2605.16850arxiv.orgEditorial Trajectories in Wikipedia Reflect Underlying Hyperlink StructureWikipedia 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... 050
Hang-Hyun Jo @socph.bsky.social · 25/04/2026FYI brunch.co.kr/@socph/16brunch.co.kr친구관계 역설 이야기왜 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... 021
Reposted by Hang-Hyun JoSang Hoon Lee @lshlj.bsky.social · 14/04/2026the final decision: not included in the program at all 001
Hang-Hyun Jo @socph.bsky.social · 10/04/2026abstract submitted to CCS 2026 ccs26.cssociety.orgccs26.cssociety.orgCCS 2026: The 2026 Conference on Complex Systems @ Binghamton, NY, USA 000