17 citations · 30 across the 6 of their papers we have counts for
6 papers
Disentangling Large-Scale Supply Networks: f-HiCoNE Framework for Flow-Hierarchical Clustering via Combinatorial Hodge Decomposition
Taiyo Nakatani, Takaaki Aoki
Modern society relies on complex supply chains to sustain the flow of goods and services that are essential to daily life. While traditional supply chain theory assumes a clear, hi…
Potential Landscapes Reveal Spatiotemporal Structure in Urban Mobility: Hodge Decomposition and Principal Component Analysis of Tokyo Before and During COVID-19
Yunhan Du, Takaaki Aoki, Naoya Fujiwara
Understanding human mobility is vital to solving societal challenges, such as epidemic control and urban transportation optimization. Recent advancements in data collection now ena…
Identifying sinks and sources of human flows: A new approach to characterizing urban structures
Takaaki Aoki, Shota Fujishima, Naoya Fujiwara
Human flow data are rich behavioral data relevant to people's decision-making regarding where to live, work, go shopping, etc., and provide vital information for identifying city c…
Urban spatial structures from human flow by Hodge-Kodaira decomposition
Takaaki Aoki, Shota Fujishima, Naoya Fujiwara
Human flow in cities indicates social activity and can reveal urban spatial structures based on human behaviours for relevant applications. Scalar potential is a mathematical conce…
Graph-based open-ended survey on concerns related to COVID-19
Tatsuro Kawamoto, Takaaki Aoki, Michiko Ueda
The COVID-19 pandemic is an unprecedented public health crisis with broad social and economic consequences. We conducted four surveys between April and August 2020 using the graph-…
Democratic summary of public opinions in free-response surveys
Tatsuro Kawamoto, Takaaki Aoki
Social surveys have been widely used as a method of obtaining public opinion. Sometimes it is more ideal to collect opinions by presenting questions in free-response formats than i…