201 citations · 475 across the 27 of their papers we have counts for
13 papers · 1 filter
Measurement of human activity using velocity GPS data obtained from mobile phones
Yasuko Kawahata, Takayuki Mizuno, Akira Ishii
Human movement is used as an indicator of human activity in modern society. The velocity of moving humans is calculated based on position information obtained from mobile phones. T…
Position-sensitive propagation of information on social media using social physics approach
Akira Ishii, Takayuki Mizuno, Yasuko Kawahata
The excitement and convergence of tweets on specific topics are well studied. However, by utilizing the position information of Tweet, it is also possible to analyze the position-s…
Structure of global buyer-supplier networks and its implications for conflict minerals regulations
Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe
We investigate the structure of global inter-firm linkages using a dataset that contains information on business partners for about 400,000 firms worldwide, including all the firms…
Predicted and Verified Deviations from Zipf's law in Ecology of Competing Products
Ryohei Hisano, Didier Sornette, Takayuki Mizuno
Zipf's power-law distribution is a generic empirical statistical regularity found in many complex systems. However, rather than universality with a single power-law exponent (equal…
Sales Distribution of Consumer Electronics
Ryohei Hisano, Takayuki Mizuno
Using the uniform most powerful unbiased test, we observed the sales distribution of consumer electronics in Japan on a daily basis and report that it follows both a lognormal dist…
A statistical analysis of product prices in online markets
Takayuki Mizuno, Tsutomu Watanabe
We empirically investigate fluctuations in product prices in online markets by using a tick-by-tick price data collected from a Japanese price comparison site, and find some simila…