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- Misako Takayasu, Kazuya Sato, Yukie Sano, Kenta Yamada, Wataru Miura, Hideki Takayasu
- PloS one
- 2015

We focus on Internet rumors and present an empirical analysis and simulation results of their diffusion and convergence during emergencies. In particular, we study one rumor that appeared in the immediate aftermath of the Great East Japan Earthquake on March 11, 2011, which later turned out to be misinformation. By investigating whole Japanese tweets that… (More)

Yukihiro Aiba, Naomichi Hatano, Hideki Takayasu, Kouhei Marumo, Tokiko Shimizu aDepartment of Physics, Aoyama Gakuin University Chitosedai 6-16-1, Setagaya, Tokyo 157-8572, Japan bSony CSL, Higashi-Gotanda 3-14-13, Shinagawa, Tokyo 141-0022, Japan cInstitute for Monetary and Economic Studies, Bank of Japan, Hongoku-cho Nihonbashi 2-1-1, Chuo, Tokyo… (More)

By analyzing the foreign exchange market data of various currencies, we derive a hierarchical taxonomy of currencies constructing minimal-spanning trees. Clustered structure of the currencies and the key currency in each cluster are found. The clusters match nicely with the geographical regions of corresponding countries in the world such as Asia or East… (More)

We analyze the distribution of income and income tax of individuals in Japan for the fiscal year 1998. From the rank-size plots we find that the accumulated probability distribution of both data obey a power law with a Pareto exponent very close to −2. We also present an analysis of the distribution of the debts owed by bankrupt companies from 1997 to… (More)

We perform a simplified Ethernet traffic simulation in order to clarify the physical mechanism of the phase transition behavior which has been experimentally observed in the flow density fluctuation of Internet traffic. In one phase traffics from nodes connected with an Ethernet cable are mixed, and in the other phase, the nodes alternately send bursts of… (More)

- Wataru Miura, Hideki Takayasu, Misako Takayasu
- Physical review letters
- 2012

We propose a new type of stochastic network evolution model based on annihilation, creation, and coagulation of nodes, together with the preferential attachment rule. The system reaches a unique quasistatistically steady state in which the distribution of links follows a power law, lifetime of nodes follows an exponential distribution, and the mean number… (More)

- Yukie Sano, Kenta Yamada, Hayafumi Watanabe, Hideki Takayasu, Misako Takayasu
- Physical review. E, Statistical, nonlinear, and…
- 2013

To uncover an underlying mechanism of collective human dynamics, we survey more than 1.8 billion blog entries and observe the statistical properties of word appearances. We focus on words that show dynamic growth and decay with a tendency to diverge on a certain day. After careful pretreatment and the use of a fitting method, we found power laws generally… (More)

- Hayafumi Watanabe, Hideki Takayasu, Misako Takayasu
- ArXiv
- 2011

Abstract. To investigate the actual phenomena of transport on a complex network, we analysed empirical data for an inter-firm trading network, which consists of about one million Japanese firms and the sales of these firms (a sale corresponds to the total in-flow into a node). First, we analysed the relationships between sales and sales of nearest… (More)

- Tsuyoshi Deguchi, Katsuhide Takahashi, Hideki Takayasu, Misako Takayasu
- PloS one
- 2014

We investigate the economic hubs and authorities of the world trade network (WTN) from 1992 to 2012, an era of rapid economic globalization. Using a well-defined weighted hyperlink-induced topic search (HITS) algorithm, we can calculate the values of the weighted HITS hub and authority for each country in a conjugate way. In the context of the WTN,… (More)

We analyze high-resolution foreign exchange data consisting of 20 million data points of USD-JPY for 13 years to report firm statistical laws in distributions and correlations of exchange rate fluctuations. A conditional probability density analysis clearly shows the existence of trend-following movements at time scale of 8-ticks, about 1 minute.