Takayuki Hiraoka
@takayukihir.bsky.social
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/
I oppose any violence against civilians and devastation of their lives.
🌐 https://sites.google.com/view/takayukihiraoka/
Reposted by Takayuki Hiraoka
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A bit late to the party, but I want to introduce a pet project of mine—and my first single-author paper! 🎉
It tackles something that has quietly frustrated me for years: how we measure the similarity of two clusterings/community structures.
A bit late to the party, but I want to introduce a pet project of mine—and my first single-author paper! 🎉
It tackles something that has quietly frustrated me for years: how we measure the similarity of two clusterings/community structures.
November 24, 2025 at 8:58 PM
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A bit late to the party, but I want to introduce a pet project of mine—and my first single-author paper! 🎉
It tackles something that has quietly frustrated me for years: how we measure the similarity of two clusterings/community structures.
A bit late to the party, but I want to introduce a pet project of mine—and my first single-author paper! 🎉
It tackles something that has quietly frustrated me for years: how we measure the similarity of two clusterings/community structures.
Reposted by Takayuki Hiraoka
Spatiotemporal Activity-Driven Networks arxiv.org/abs/2511.15533
Spatiotemporal Activity-Driven Networks
Temporal-network models have provided key insights into how time-varying connectivity shapes dynamical processes such as spreading. Among them, the activity-driven model is a widely used, analytically...
arxiv.org
November 23, 2025 at 9:23 AM
Spatiotemporal Activity-Driven Networks arxiv.org/abs/2511.15533
Reposted by Takayuki Hiraoka
Latest out: Fairness in infectious disease modeling. Great collaboration with Yuhan Li, @ngozzi.bsky.social @mtizzoni.bsky.social www.medrxiv.org/content/10.1...
November 14, 2025 at 6:06 PM
Latest out: Fairness in infectious disease modeling. Great collaboration with Yuhan Li, @ngozzi.bsky.social @mtizzoni.bsky.social www.medrxiv.org/content/10.1...
Reposted by Takayuki Hiraoka
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
published pubs.aip.org/aip/cha/arti...
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
sites.google.com/view/cxrex
November 3, 2025 at 10:13 AM
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
sites.google.com/view/cxrex
Reposted by Takayuki Hiraoka
📢 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.
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October 15, 2025 at 8:56 AM
📢 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.
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Reposted by Takayuki Hiraoka
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
Reminder: Last chance to apply for our postdoc positions in polarisation + mental well-being: www.aalto.fi/en/open-posi...
Reposted by Takayuki Hiraoka
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
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
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
go.nature.com/4nzGhp9
Reposted by Takayuki Hiraoka
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...
Full call text and link to apply: www.aalto.fi/en/open-posi...
September 17, 2025 at 10:22 AM
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...
Full call text and link to apply: www.aalto.fi/en/open-posi...
Reposted by Takayuki Hiraoka
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
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)
Reposted by Takayuki Hiraoka
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...
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
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...
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...
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...
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
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...
journals.aps.org/pre/abstract...
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
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
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
arxiv.org/abs/2508.18281
Reposted by Takayuki Hiraoka
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
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
Reposted by Takayuki Hiraoka
PNAS: Strength and weakness of disease-induced herd immunity in networks
https://www.pnas.org/doi/abs/10.1073/pnas.2421460122?af=R
https://www.pnas.org/doi/abs/10.1073/pnas.2421460122?af=R
August 15, 2025 at 1:12 PM
PNAS: Strength and weakness of disease-induced herd immunity in networks
https://www.pnas.org/doi/abs/10.1073/pnas.2421460122?af=R
https://www.pnas.org/doi/abs/10.1073/pnas.2421460122?af=R
Reposted by Takayuki Hiraoka
Eighty years after the atomic bomb was dropped on Japan, we hear from one of the survivors
go.nature.com/45pj3e1
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
Eighty years after the atomic bomb was dropped on Japan, we hear from one of the survivors
go.nature.com/45pj3e1
go.nature.com/45pj3e1
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...
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
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...
blog.mendeley.com/2025/07/09/m...
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.
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
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.
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.
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
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.
On Tuesday, Tarmo Nurmi successfully defended his thesis on multilayer networks. Congratulations, Tarmo!
June 19, 2025 at 3:48 PM
On Tuesday, Tarmo Nurmi successfully defended his thesis on multilayer networks. Congratulations, Tarmo!
Reposted by Takayuki Hiraoka
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
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/...
Reposted by Takayuki Hiraoka
Our paper has been finally published in PLOS ONE! See doi.org/10.1371/jour...
June 5, 2025 at 11:32 PM
Our paper has been finally published in PLOS ONE! See doi.org/10.1371/jour...
My bus is delayed, time for another beer
June 6, 2025 at 1:51 PM
My bus is delayed, time for another beer
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
So many interesting talks at #NetSci2025! Here are some of my favorites among contributed presentations I heard today: