Takayuki Hiraoka
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takayukihir.bsky.social
Takayuki Hiraoka
@takayukihir.bsky.social
130 followers 180 following 74 posts
Studying complex systems and network science. Postdoc at Aalto University.

I oppose any violence against civilians and devastation of their lives.

🌐 https://sites.google.com/view/takayukihiraoka/
Posts Replies Media Videos
Reposted by Takayuki Hiraoka
socph.bsky.social
published pubs.aip.org/aip/cha/arti...
Hierarchical organization of bursty trains in event sequences
Temporal sequences of discrete events that describe natural and social processes are often driven by non-Poisson dynamics. In addition to a heavy-tailed interev
pubs.aip.org
November 11, 2025 at 2:03 PM
takayukihir.bsky.social
A semi-regular reminder: My colleagues and I are running an interdisciplinary online seminar series called Complex Systems Research Exchange (CREx🦖).
sites.google.com/view/cxrex
Home page of the Complex Systems Research Exchange website. It reads: Complex Systems Research Exchange (CREx) is an online seminar series aimed at building an international research community in the interdisciplinary field of complex systems, very broadly defined. Our focus is on creating opportunities to hear from early to mid-career researchers about their research, while also serving as a platform for networking and collaboration. We are open to a wide range of research areas including network science, nonlinear dynamics, dynamical systems, computational social science, science of science, machine learning and AI, data science, urban science and human mobility, mathematical biology and ecology, neuroscience, and more. Please subscribe to the mailing list to receive announcements of upcoming seminars. The Zoom link for each seminar will be sent to the mailing list shortly before the seminar. Please reach out to organizers if you are interested in giving a presentation yourself or know someone who would be interested. This seminar series is run on a volunteer basis and is currently organized without funding. Organizers: Jeehye Choi, Takayuki Hiraoka, Inho Hong, Hyewon Kim, Kazuki Nakajima, Ayumi Ozawa, Taekho You
November 3, 2025 at 10:13 AM
Reposted by Takayuki Hiraoka
vtraag.bsky.social
📢 New reviewed preprint, published by @elife.bsky.social at doi.org/10.7554/eLif.... We study two effects in science funding across 14 different funding programmes from 6 research funders across Europe and North America: (1) The Matthew effect; and (2) and the early-career setback effect.

🧵1/8
Illustration of the Matthew effect and the early-career setback effect. An academic, say Alice, first applies for early-career funding in 2015. She received early-career funding, and goes on to reapply for later-career funding in 2020. According to the Matthew effect, the chances of Alice receiving later-career funding is higher when she received early-career funding. Alice showed a high Mean Field Citation Rate (MFCR) before receiving her early-career funding, and similarly a high MFCR in between the early-career and later-career applications. According to the early-career setback effect, had she instead not received funding, her "Between" MFCR would have been higher. We not only study the "Between" MFCR, we also study the MFCR after the early-career application ("Post (early)") and after the later-career application ("Post (later)").
October 15, 2025 at 8:56 AM
Reposted by Takayuki Hiraoka
bolozna.bsky.social
Reminder: Last chance to apply for our postdoc positions in polarisation + mental well-being: www.aalto.fi/en/open-posi...
Open postdoctoral and doctoral positions to work on polarization and mental health | Aalto University
You will be working in the research group of one of the PIs of the projects, but in collaboration with the others. The PIs are Talayeh Aledavood, Juhi Kulshrestha, and Mikko Kivelä.
www.aalto.fi
October 10, 2025 at 7:49 PM
Reposted by Takayuki Hiraoka
nature.com
Science isn’t really moving towards equity; institutions are just perfecting the appearance of equity. We need to build an alternative system, says Dolors Armenteras

go.nature.com/4nzGhp9
Equity in science is a beautiful lie — and I’m done pretending
Science isn’t really moving towards equity; institutions are just perfecting the appearance of equity. We need to build an alternative system.
go.nature.com
September 16, 2025 at 5:01 PM
Reposted by Takayuki Hiraoka
juhi153.bsky.social
We are hiring multiple PhD and postdocs for two newly funded projects at the intersection of mental health and political polarization at the CS Dept at Aalto, Finland. The PIs are Juhi Kulshrestha, Talayeh Aledavood, and Mikko Kivelä.

Full call text and link to apply: www.aalto.fi/en/open-posi...
September 17, 2025 at 10:22 AM
Reposted by Takayuki Hiraoka
gfalbery.bsky.social
Celebrating the publication of our big collaborative spatial-social meta-analysis of density-dependent transmission effects, out now in Nature Eco Evo! doi.org/10.1038/s415... (or rdcu.be/eD6eB)
September 8, 2025 at 2:53 PM
takayukihir.bsky.social
A world map showing the locations of cities that hosted/will host international scientific conferences in 2025 and 2026. NetSci 2025 Maastricht, IC2S2 2025 Norkköping, and CCS 2025 Siena are on the left-hand side, while NetSci 2026 Boston, IC2S2 2026 Burlington, and CCS 2026 Binghamton are close together on the right-hand side.
September 6, 2025 at 3:13 PM
Reposted by Takayuki Hiraoka
danielhankim.bsky.social
Q: How are resources consumed in transportation networks, and how does this shape the overall functioning of the system?

We introduce the minimum-cost percolation framework and apply it to the U.S. air transportation system using publicly available data.

🔗 www.nature.com/articles/s41...
Modeling resource consumption in the US air transportation system via minimum-cost percolation - Nature Communications
Percolation frameworks have been used to characterize the robustness of infrastructural networks. Here, authors introduce a percolation-based framework to study resource consumption and network effect...
www.nature.com
August 29, 2025 at 7:43 PM
takayukihir.bsky.social
Our paper about discounting the influence of node attributes from detected communities in networks is out in Physical Review E!
journals.aps.org/pre/abstract...
Block-corrected modularity for community detection
Unknown node attributes in complex networks may introduce community structures that are important to distinguish from those driven by known attributes. We propose a block-corrected modularity that dis...
journals.aps.org
August 29, 2025 at 5:39 PM
takayukihir.bsky.social
Happy to share this long-overdue project! We found that many real-world event sequences follow a surprisingly similar hierarchically structured pattern, and that multi-timescale memory mechanisms can explain this pattern. Feedback welcome!
arxiv.org/abs/2508.18281
Hierarchical organization of bursty trains in event sequences
Temporal sequences of discrete events that describe natural and social processes are often driven by non-Poisson dynamics. In addition to a heavy-tailed interevent time distribution, which primarily c...
arxiv.org
August 27, 2025 at 6:40 AM
Reposted by Takayuki Hiraoka
socph.bsky.social
Our new preprint with @takayukihir.bsky.social is out in arXiv: Takayuki Hiraoka‬ and Hang-Hyun Jo, Hierarchical organization of bursty trains in event sequences, arxiv.org/abs/2508.18281
Hierarchical organization of bursty trains in event sequences
Temporal sequences of discrete events that describe natural and social processes are often driven by non-Poisson dynamics. In addition to a heavy-tailed interevent time distribution, which primarily c...
arxiv.org
August 27, 2025 at 1:05 AM
Reposted by Takayuki Hiraoka
networkspapers.bsky.social
PNAS: Strength and weakness of disease-induced herd immunity in networks
https://www.pnas.org/doi/abs/10.1073/pnas.2421460122?af=R
August 15, 2025 at 1:12 PM
Reposted by Takayuki Hiraoka
nature.com
Eighty years after the atomic bomb was dropped on Japan, we hear from one of the survivors

go.nature.com/45pj3e1
‘The Sun had fallen to Earth’ — a survivor’s recollection of the Hiroshima bombing
Eighty years after the atomic bomb was dropped on Japan, it is crucial that witness accounts are saved. Here is what one man told me.
go.nature.com
August 5, 2025 at 9:53 AM
takayukihir.bsky.social
This is a huge news to me—that Mendeley Desktop is not going to be discontinued—yet nobody in my timeline seems to be talking about it?
blog.mendeley.com/2025/07/09/m...
Mendeley Desktop is Here to Stay.
We previously announced that Mendeley Desktop would no longer be available for new downloads and installations (more details here). Many of you told us how much you love Mendeley Desktop …
blog.mendeley.com
July 23, 2025 at 2:17 PM
takayukihir.bsky.social
New paper in PNAS!🎉 doi.org/10.1073/pnas...

Is herd immunity to infectious diseases effective when induced by natural infection? Earlier studies have suggested that population heterogeneity makes disease-induced herd immunity more effective than previously thought. Our work challenges this notion.
Strength and weakness of disease-induced herd immunity in networks | PNAS
When a fraction of a population becomes immune to an infectious disease, the population-wide infection risk decreases nonlinearly due to collective...
doi.org
July 19, 2025 at 4:50 PM
takayukihir.bsky.social
Spatial cognition is vital for all animals. Humans, in particular, use cartographic knowledge and language to understand the environment beyond what we directly experience. Place names (toponyms) play a key role in this cognitive process as they reflect how we mentally structure geographical space.
June 29, 2025 at 2:03 PM
takayukihir.bsky.social
On Tuesday, Tarmo Nurmi successfully defended his thesis on multilayer networks. Congratulations, Tarmo!
Tarmo Nurmi presents his thesis in front of the opponent, custos, and audience in a lecture room. From left to right: the custos Prof. Mikko Kivelä, the doctoral student Tarmo Nurmi, and the opponent Prof. Nataša Pržulj, after the defence.
June 19, 2025 at 3:48 PM
Reposted by Takayuki Hiraoka
netscience.bsky.social
Latest out in PNAS!! Comparative evaluation of behavioral epidemic models using COVID-19 data. Amazing collaboration with @ngozzi.bsky.social and @alexvespi.bsky.social www.pnas.org/doi/10.1073/...
June 13, 2025 at 7:32 AM
Reposted by Takayuki Hiraoka
socph.bsky.social
Our paper has been finally published in PLOS ONE! See doi.org/10.1371/jour...
June 5, 2025 at 11:32 PM
takayukihir.bsky.social
My bus is delayed, time for another beer
A glass of beer on a table in an outdoor café
June 6, 2025 at 1:51 PM
takayukihir.bsky.social
So many interesting talks at #NetSci2025! Here are some of my favorites among contributed presentations I heard today:
June 4, 2025 at 8:43 PM
Reposted by Takayuki Hiraoka
takayukihir.bsky.social
Arrived in Maastricht, excited to be attending #NetSci2025 this week! If you're there too, please visit poster #4 by my collaborator, Zahra Ghadiri, during lunchtime on Wednesday. She will tell you about our research, “Epidemic Reproduction Number in Spatial Networks”.
June 1, 2025 at 6:20 PM
takayukihir.bsky.social
Arrived in Maastricht, excited to be attending #NetSci2025 this week! If you're there too, please visit poster #4 by my collaborator, Zahra Ghadiri, during lunchtime on Wednesday. She will tell you about our research, “Epidemic Reproduction Number in Spatial Networks”.
June 1, 2025 at 6:20 PM
takayukihir.bsky.social
Cool study showing that the pattern of wrinkles on a finger immersed in water for long time is always the same.
doi.org/10.1016/j.jm...
May 26, 2025 at 9:23 PM