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Regional Quantitative Systems Analysis Lab
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A lab that uses network science to investigate human flows and how cities form.
AboutAbout the lab
Viewing society, the economy, and regions through network science and nonlinear science
The Regional Quantitative Systems Analysis Lab, with complex networks and nonlinear science as its keywords, conducts broad research from data analysis to modeling.
As mobile phones and other devices have spread, detailed data on society and the economy have become easier to obtain, and information science plays an increasingly important role in analyzing such data.
According to the lab's website, people from any background are welcome, including spatial economics, regional science, spatial information science, mathematical engineering, and data science.
On the lab's website, it is introduced under the name "Fujiwara Lab."
Key terms
- Complex networks
- A network that represents people, regions, and so on as points and the connections between them as lines. The properties of the whole are studied through the characteristics of how the points connect
- Nonlinear science
- A field that deals with phenomena in which results are not proportional to causes. It also covers topics such as synchronization among oscillators
- Effective reproduction number
- A number indicating how many people one infected person infects on average. It serves as a measure of how readily an infection spreads
ResearchResearch themes
Now that detailed data related to society and the economy are easy to obtain, the lab conducts broad research from data analysis to modeling, with complex networks and nonlinear science as keywords. Concrete subjects include the analysis of human flows and mathematical models of urban formation.
*Illustrative imageHuman Mobility Analysis During the COVID-19 Pandemic
The lab reported a correlation between the effective reproduction number, which characterizes the spread of COVID-19, and indicators of human mobility. From mobility data for the first and second waves, it showed tendencies such as people being more likely to refrain from going out the denser the population of the destination.
*Illustrative imageHuman Mobility Network Analysis
Data on flows of people between regions can be regarded as networks, which makes them well suited to network analysis. From interregional commuting flow data, the lab showed that a hierarchical cluster structure can be extracted that is spatially contiguous and matches well with the intuitive notion of a "region."
*Illustrative imageBehavior Analysis of Parents Raising Children
By analyzing large-scale GPS data from smartphones, the lab identified behavioral tendencies specific to parents of young children. Parents estimated to be raising children spent more time at home than others and were less likely to visit places they had never been.
*Illustrative imageMathematical Models of Urban Formation
The lab proposed a simple mathematical model using data such as satellite imagery of terrain and showed that it can reproduce real population distributions. It also analyzes the mathematical structure of the model.
MembersFaculty
The members of the Fujiwara Lab consist of faculty, technical assistants, secretaries, and doctoral and master's students.As of 2026
- ProfessorNaoya Fujiwara
- Project Assistant ProfessorZhiqiong Fu
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Kazan city night aerial view southboubd ( )” Artem Svetlov from Moscow, Russia / CC BY 2.0 (cropped)
- Human Mobility Analysis During the COVID-19 Pandemic: “Shibuya Crossing ( )” Dick Thomas Johnson from Tokyo, Japan / CC BY 2.0 (cropped)
- Human Mobility Network Analysis: “Network graph visualization showing bibliography and keywords” Ecpp / CC BY-SA 4.0 (cropped)
- Behavior Analysis of Parents Raising Children: “A family with a stroller on the Grotto Falls trail -432 Custer Gallatin NF 3W6A )” Forest Service - Northern Region / Public domain (cropped)
- Mathematical Models of Urban Formation: “Delhi Aerial View, Satellite Image, India September 2003” NASA / Public domain (cropped)
- Related lab (Urban Socioeconomic Systems Analysis Lab): “Tokyo Metro and JR East at Ochanomizu, Tokyo” Kabelleger / David Gubler / CC BY-SA 4.0 (cropped)
- Related lab (Political Communication Lab): “Historical documents in the Swedish National archives” OlesiaLukaniuk (WMUA) / CC BY-SA 4.0 (cropped)
- Related lab (Spatial Planning Science Lab): “PANO-X GIS BASED 360 PANORAMIC AUTOMATION SYSTEM” Panoramicweb / CC BY-SA 4.0 (cropped)
- Related lab (Transportation Control Lab): “World Class Traffic Jam )” joiseyshowaa from Freehold, NJ, USA / CC BY-SA 2.0 (cropped)
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