Updated on 2022/01/20

写真b

 
OHNISHI Takaaki
 
*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)
Affiliation*
Graduate School of Artificial Intelligence and Science Artificial Intelligence and Science
College of Economics Department of Economics
Title*
Professor
Degree
博士(科学) ( 東京大学 )
Research Theme*
  • データ科学、機械学習、社会・経済物理学、ネットワーク科学、超並列計算の手法を用いて店舗・施設・人の地理空間情報、金融市場・マウス脳波・人間行動の時系列、TV・ニュース・Twitter・ウェブのテキストデータ、市場間相関・貿易・取引関係のネットワークなどを実証科学的に研究することで、価値ある新たな知見の創出を目指している。【略歴】東京大学大学院新領域創成科学研究科博士課程修了。博士(科学)。同大学院法学政治学研究科助手、同研究科助教、キヤノングローバル戦略研究所研究員、同研究所主任研究員、東京大学大学院情報理工学系研究科准教授を経て2020年より現職。

  • Campus Career*
    • 4 2020 - Present 
      Graduate School of Artificial Intelligence and Science   Artificial Intelligence and Science   Professor
    • 4 2020 - Present 
      College of Economics   Department of Economics   Professor
     

    Research Areas

    • Others / Others

    Research History

    • 4 2020 - Present 
      立教大学大学院人工知能科学研究科 教授

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    • 11 2013 - 3 2020 
      The University of Tokyo   The Graduate School of Information Science and Technology, Department of Mathematical Informatics

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    • 10 2013 - 3 2020 
      The University of Tokyo   The Graduate School of Information Science and Technology

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    • 8 2013 - 9 2013 
      Institute of Statistical Research

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    • 1 2012 - 9 2013 
      一般財団法人キヤノングローバル戦略研究所   主任研究員

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    • 10 2009 - 7 2013 
      The University of Tokyo   Division of Economics, Graduate School

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    • 6 2009 - 12 2011 
      一般財団法人キヤノングローバル戦略研究所   研究員

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    • 6 2009 - 10 2009 
      The University of Tokyo   School of Legal and Political Studies, Graduate Schools for Law and Politics

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    • 4 2004 - 5 2009 
      The University of Tokyo   School of Legal and Political Studies, Graduate Schools for Law and Politics

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    Education

    • 4 2001 - 3 2004 
      The University of Tokyo   Graduate School of Frontier Sciences   Department of Complexity Science and Engineering

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    • 4 1999 - 3 2001 
      The University of Tokyo   The Graduate School of Engineering

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    • 4 1995 - 3 1999 
      University of Tsukuba

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    Papers

    • Metabolic fingerprints of fear memory consolidation during sleep Peer-reviewed

      Iyo Koyanagi, Kazuhiro Sonomura, Toshie Naoi, Takaaki Ohnishi, Naoko Kaneko, Kazunobu Sawamoto, Tak-Aki Sato, Masanori Sakaguchi

      Molecular Brain14 ( 30 )   2 2021

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    • Uncovering the Image Structure of Japanese TV Commercials Through a Co-occurrence Network Representation Peer-reviewed

      Mariko I. Ito, Takaaki Ohnishi

      In: Complex Networks and Their Applications IX. COMPLEX NETWORKS 2020. Studies in Computational Intelligence, Springer943   273 - 283   2021

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      Publishing type:Part of collection (book)   Publisher:Springer International Publishing  

      DOI: 10.1007/978-3-030-65347-7_23

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    • Nondiagonal Mixture of Dirichlet Network Distributions for Analyzing a Stock Ownership Network Peer-reviewed

      Wenning Zhang, Ryohei Hisano, Takaaki Ohnishi, Takayuki Mizuno

      In: Complex Networks and Their Applications IX. COMPLEX NETWORKS 2020. Studies in Computational Intelligence, Springer943   75 - 86   2021

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    • Topological Data Analysis of Microdomain Patterns of Block Copolymer Peer-reviewed

      Y. Mototake, S. Yamanaka, T. Aoyagi, T. Ohnishi, K. Fukumizu

      Proceedings of the 2020 International Symposium on Nonlinear Theory and its Applications (NOLTA2020)   517 - 520   11 2020

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    • Quantification of microphase separated structures from the viewpoint of multifractal Peer-reviewed

      Proceedings of the 2020 International Symposium on Nonlinear Theory and its Applications (NOLTA2020)   480 - 483   11 2020

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      Language:English  

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    • Complex Network Representation of the Structure-Mechanical Property Relationships in Elastomers with Heterogeneous Connectivity Peer-reviewed

      Yoshifumi Amamoto, Ken Kojio, Atsushi Takahara, Yuichi Masubuchi, Takaaki Ohnishi

      Patterns1 ( 8 ) 100135 - 100135   11 2020

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      Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

      DOI: 10.1016/j.patter.2020.100135

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    • House price dispersion in boom–bust cycles: evidence from Tokyo Peer-reviewed

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      The Japanese Economic Review71 ( 4 ) 511 - 539   10 2020

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      Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

      DOI: 10.1007/s42973-019-00019-6

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      Other Link: http://link.springer.com/article/10.1007/s42973-019-00019-6/fulltext.html

    • Evaluation of the Heterogeneous Spatial Distribution of Population and Stores/Facilities by Multifractal Analysis Peer-reviewed

      Mariko I. Ito, Takaaki Ohnishi

      Frontiers in Physics8 ( 291 ) 1 - 12   4 8 2020

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      Publishing type:Research paper (scientific journal)   Publisher:Frontiers Media SA  

      DOI: 10.3389/fphy.2020.00291

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    • Sparse Activity of Hippocampal Adult-Born Neurons during REM Sleep Is Necessary for Memory Consolidation Peer-reviewed

      Deependra Kumar, Iyo Koyanagi, Alvaro Carrier-Ruiz, Pablo Vergara, Sakthivel Srinivasan, Yuki Sugaya, Masatoshi Kasuya, Tzong-Shiue Yu, Kaspar E. Vogt, Masafumi Muratani, Takaaki Ohnishi, Sima Singh, Catia M. Teixeira, Yoan Chérasse, Toshie Naoi, Szu-Han Wang, Pimpimon Nondhalee, Boran A.H. Osman, Naoko Kaneko, Kazunobu Sawamoto, Steven G. Kernie, Takeshi Sakurai, Thomas J. McHugh, Masanobu Kano, Masashi Yanagisawa, Masanori Sakaguchi

      Neuron107 ( 3 ) 552 - 565.e10   8 2020

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      Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

      DOI: 10.1016/j.neuron.2020.05.008

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    • Weighted Network Analysis for Computer-Aided Drug Discovery Peer-reviewed

      Mariko I. Ito, Takaaki Ohnishi

      In: Czarnowski I., Howlett R., Jain L. (eds) Intelligent Decision Technologies. IDT 2020. Smart Innovation, Systems and Technologies, Springer, Singapore.   27 - 36   6 2020

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      Publishing type:Part of collection (book)   Publisher:Springer Singapore  

      DOI: 10.1007/978-981-15-5925-9_3

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    • Detecting stock market bubbles based on the cross-sectional dispersion of stock prices Peer-reviewed

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      In: Sato H., Iwanaga S., Ishii A. (eds) Proceedings of the 23rd Asia Pacific Symposium on Intelligent and Evolutionary Systems. IES 2019. Proceedings in Adaptation, Learning and Optimization, Springer, Cham.2   194 - 202   12 2019

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    • Novel and topical business news and their impact on stock market activity

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      EPJ Data Science6 ( 26 )   12 2017

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      Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

      DOI: 10.1140/epjds/s13688-017-0123-7

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      Other Link: http://link.springer.com/article/10.1140/epjds/s13688-017-0123-7/fulltext.html

    • Revealing Persistent Structure of International Trade by Nonnegative Matrix Factorization Peer-reviewed

      Chikara Mizokami, Takaaki Ohnishi

      In: Cherifi C., Cherifi H., Karsai M., Musolesi M. (eds) Complex Networks & Their Applications VI. COMPLEX NETWORKS 2017. Studies in Computational Intelligence (Springer, Cham)689   1088 - 1099   11 2017

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    • Relationship between population density and population movement in inhabitable lands Peer-reviewed

      Shouji Fujimoto, Takayuki Mizuno, Takaaki Ohnishi, Chihiro Shimizu, Tsutomu Watanabe

      Evolutionary and Institutional Economics Review14 ( 1 ) 117 - 130   6 2017

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    • The gradual evolution of buyer-seller networks and their role in aggregate fluctuations Peer-reviewed

      Ryohei Hisano, Tsutomu Watanabe, Takayuki Mizuno, Takaaki Ohnishi, Didier Sornette

      Applied Network Science2   9   5 2017

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    • Power laws in market capitalization during the Dot-com and Shanghai bubble periods Peer-reviewed

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      Evolutionary and Institutional Economics Review13 ( 2 ) 445 - 454   9 2016

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    • Econophysics Point of View of Trade Liberalization: Community dynamics, synchronization, and controllability as example of collective motions Peer-reviewed

      Y. Ikeda, H. Aoyama, H. Iyetomi, T. Mizuno, T. Ohnishi, Y. Sakamoto, T. Watanabe

      RIETI Discussion Paper Series 16-E-026   1 - 35   3 2016

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    • Structure of global buyer-supplier networks and its implications for conflict minerals regulations Peer-reviewed

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      EPJ DATA SCIENCE5 ( 2 )   1 2016

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

      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 listed on the major stock exchanges. Among the firms, we examine three networks, which are based on customer-supplier, licensee-licensor, and strategic alliance relationships. First, we show that these networks all have scale-free topology and that the degree distribution for each follows a power law with an exponent of 1.5. The shortest path length is around six for all three networks. Second, we show through community structure analysis that the firms comprise a community with those firms that belong to the same industry but different home countries, indicating the globalization of firms' production activities. Finally, we discuss what such production globalization implies for the proliferation of conflict minerals (i.e., minerals extracted from conflict zones and sold to firms in other countries to perpetuate fighting) through global buyer-supplier linkages. We show that a limited number of firms belonging to some specific industries and countries plays an important role in the global proliferation of conflict minerals. Our numerical simulation shows that regulations on the purchases of conflict minerals by those firms would substantially reduce their worldwide use.

      DOI: 10.1140/epjds/s13688-016-0063-7

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    • Geographic Dependency of Population Distribution Peer-reviewed

      Shouji Fujimoto, Takayuki Mizuno, Takaaki Ohnishi, Chihiro Shimizu, Tsutomu Watanabe

      Proceedings of the International Conference on Social Modeling and Simulation 2014   151 - 162   10 2015

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    • The Structure of Global Inter-firm Networks Peer-reviewed

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      Social Informatics8852   334 - 338   2015

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      Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER-VERLAG BERLIN  

      We investigate the structure of global inter-firm relationships using a unique dataset containing information on customers, suppliers, licensors, licensees and strategic alliances for each of 412,814 major incorporated non-financial firms in the world. We focus on three different networks: customer-supplier network, licensee-licensor network, and strategic alliance network. In/out-degree distribution of these networks follows a Pareto distribution with an exponent of 1.5. The shortest path length on the networks for any pair of firms is around six links. The networks have a scale-free property. We also find that stock price returns tend to be more highly correlated the closer two listed firms are to each other in the networks. This suggests that a non-negligible portion of price fluctuations stems from the propagation of a particular firm's shocks through inter-firm relationships.

      DOI: 10.1007/978-3-319-15168-7_42

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    • Relationship between job opportunities and economic environments measured from data in internet job searching sites Peer-reviewed

      Aki-Hiro Sato, Chihiro Shimizu, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      KNOWLEDGE-BASED AND INTELLIGENT INFORMATION & ENGINEERING SYSTEMS 19TH ANNUAL CONFERENCE, KES-201560   1255 - 1262   2015

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      Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:ELSEVIER SCIENCE BV  

      This study investigates the number of job opportunities collected from a Japanese job searching site ("fromA navi") and an international job searching site ("Indeed"). We confirm that a relationship between the number of job opportunities and socioeconomic quantities (the population, the numbers of firms and workers) in each 1-km grid square in Japan. The number of workers is the best explanatory variable to explain the number of job opportunities in Japan. The regression coefficients can be used as an indicator to grasp Japanese macroeconomic conditions. From a global point of view, we analyse the number of job opportunities in about 16,000 cities all over the world. We confirm the daily number of job opportunities in each city varies in time and show some associations with macroeconomic indicators. We compute a relationship between means of the daily number of job opportunities and their standard deviations and confirm that it follows a scaling relationship with power law exponent alpha = 1. A possible model based on Poisson processes with intensity of which varies in time on the basis of a common noise is proposed to explain the phenomenon empirically observed. (C) 2015 The Authors. Published by Elsevier B.V.

      DOI: 10.1016/j.procs.2015.08.191

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    • Community Structure and Dynamics of the Industry Sector-Specific International-Trade-Network Peer-reviewed

      Y. Ikeda, H. Iyetomi, T. Mizuno, T. Ohnishi, T. Watanabe

      10TH INTERNATIONAL CONFERENCE ON SIGNAL-IMAGE TECHNOLOGY AND INTERNET-BASED SYSTEMS SITIS 2014   456 - 461   2014

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      Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

      We analyzed the industry sector-specific international trade data from 1995 to 2011 to clarify the structure and dynamics of communities that consist of industry sectors in various countries linked by international trade. We applied conventional community analysis to each time slice of the international trade network, and then identified the links between communities in adjoining years by using the World Input-Output Database. This database contains the industry sector-specific international trade data on 41 countries and 35 industry sectors. The identified link structure shows that a triple backbone structure exists in the international trade network. We used the Hilbert transform to evaluate the phase time series of the growth rate of value added for 1435 nodes and then estimated the complex order parameters for communities. The respective amplitude for the order parameter of each community was observed to be greater than the amplitude for all sectors. This means active trade produces higher phase coherence within each community. Phase coherence decreased gradually in the late 1990's but increased sharply in 2001 and 2002.

      DOI: 10.1109/SITIS.2014.67

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    • Ecosystems Perspective on Financial Networks: Diagnostic Tools Peer-reviewed

      Eduardo Viegas, Misako Takayasu, Wataru Miura, Koutarou Tamura, Takaaki Ohnishi, Hideki Takayasu, Henrik Jeldtoft Jensen

      COMPLEXITY19 ( 1 ) 22 - 36   9 2013

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

      The world economy consists of highly interconnected and interdependent commercial and financial networks. Here, we develop temporal and structural network tools to analyze the state of the economy and the financial markets. Our analysis indicates that a strong clustering can be a warning sign. Reduction in diversity, which was an essential aspect of the dynamics surrounding the financial markets crisis of 2008, is seen as a key emergent feature arising naturally from the evolutionary and adaptive dynamics inherent to the financial markets. Similarly, collusion amongst construction firms in a number of regions in Japan in the 2000s can be identified with the formation of clusters of anomalous highly connected companies. (c) 2013 Wiley Periodicals, Inc. Complexity 19: 22-36, 2013

      DOI: 10.1002/cplx.21452

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    • High Quality Topic Extraction from Business News Explains Abnormal Financial Market Volatility Peer-reviewed

      Ryohei Hisano, Didier Sornette, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      PLOS ONE8 ( 6 ) e64846   6 2013

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:PUBLIC LIBRARY SCIENCE  

      Understanding the mutual relationships between information flows and social activity in society today is one of the cornerstones of the social sciences. In financial economics, the key issue in this regard is understanding and quantifying how news of all possible types (geopolitical, environmental, social, financial, economic, etc.) affects trading and the pricing of firms in organized stock markets. In this article, we seek to address this issue by performing an analysis of more than 24 million news records provided by Thompson Reuters and of their relationship with trading activity for 206 major stocks in the S&P US stock index. We show that the whole landscape of news that affects stock price movements can be automatically summarized via simple regularized regressions between trading activity and news information pieces decomposed, with the help of simple topic modeling techniques, into their "thematic" features. Using these methods, we are able to estimate and quantify the impacts of news on trading. We introduce network-based visualization techniques to represent the whole landscape of news information associated with a basket of stocks. The examination of the words that are representative of the topic distributions confirms that our method is able to extract the significant pieces of information influencing the stock market. Our results show that one of the most puzzling stylized facts in financial economies, namely that at certain times trading volumes appear to be "abnormally large," can be partially explained by the flow of news. In this sense, our results prove that there is no "excess trading," when restricting to times when news is genuinely novel and provides relevant financial information.

      DOI: 10.1371/journal.pone.0064846

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    • Replication of non-trivial directional motion in multi-scales observed by the runs test Peer-reviewed

      Yoshihiro Yura, Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      International Journal of Modern Physics: Conference Series16   136 - 148   9 2012

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    • Power Laws in Real Estate Prices during Bubble Periods Peer-reviewed

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Tsutomu Watanabe

      International Journal of Modern Physics: Conference Series16   61 - 81   9 2012

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    • On the nonstationarity of the exchange rate process Peer-reviewed

      Takaaki Ohnishi, Hideki Takayasu, Takatoshi Ito, Yuko Hashimoto, Tsutomu Watanabe, Misako Takayasu

      INTERNATIONAL REVIEW OF FINANCIAL ANALYSIS23   30 - 34   6 2012

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE INC  

      We empirically investigate the nonstationarity property of the USD-JPY exchange rate by using a high frequency data set spanning 8 years. We perform a statistical test of strict stationarity based on the two-sample Kolmogorov-Smirnov test for the absolute price changes, and Pearson's chi square test for the number of successive price changes in the same direction, and find statistically significant evidence of nonstationarity. Further, we study the recurrence intervals between the days in which nonstationarity occurs and find that the distribution of recurrence intervals is well approximated by an exponential distribution. In addition, we find that the mean conditional recurrence interval hTjT0i is independent of the previous recurrence interval TO. These findings indicate that the recurrence intervals are characterized by a Poisson process. We interpret this observation as a reflection of the Poisson property regarding the arrival of news. (C) 2011 Elsevier Inc. All rights reserved.

      DOI: 10.1016/j.irfa.2011.06.010

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    • Temporal and Cross Correlations in Business News Peer-reviewed

      Takayuki Mizuno, Kazumasa Takei, Takaaki Ohnishi, Tsutomu Watanabe

      PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT ( 194 ) 181 - 192   2012

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

      We empirically investigate temporal and cross correlations in the frequency of news reports on companies, using a dataset of more than 100 million news articles reported in English by around 500 press agencies worldwide for the period 2003-2009. Our first finding is that the frequency of news reports on a company does not follow a Poisson process, but instead exhibits long memory with a positive autocorrelation for longer than one year. The second finding is that there exist significant correlations in the frequency of news across companies. Specifically, on a daily time scale or longer the frequency of news is governed by external dynamics, while on a time scale of minutes it is governed by internal dynamics. These two findings indicate that the frequency of news reports on companies has statistical properties similar to trading volume or price volatility in stock markets, suggesting that the flow of information through company news plays an important role in price dynamics in stock markets.

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    • Random walk or a run. Market microstructure analysis of foreign exchange rate movements based on conditional probability Peer-reviewed

      Yuko Hashimoto, Takatoshi Ito, Takaaki Ohnishi, Misako Takayasu, Hideki Takayasu, Tsutomu Watanabe

      QUANTITATIVE FINANCE12 ( 6 ) 893 - 905   2012

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD  

      Using tick-by-tick data for the dollar-yen and euro-dollar exchange rates recorded on the actual transaction platform, a 'run'-continuous increases or decreases in deal prices for the past several ticks-does have some predictable information on the direction of the next price movement. Deal price movements, that are consistent with order flows, tend to continue a run once it is started. Indeed, conditional probabilities of a run continuing in the same direction after several consecutive observations exceed 0.5. However, quote prices do not show such a run tendency. Hence, a random walk hypothesis is refuted in a simple test of a run using tick-by-tick data. In addition, a longer continuous increase of the price tends to be followed by a larger reversal. The findings suggest that those market participants who have access to real-time, tick-by-tick transaction data may have an advantage in predicting exchange rate movements. The findings reported here also lend support to the momentum trading strategy.

      DOI: 10.1080/14697681003792237

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    • The dynamics and distribution of the area price in the Nord Pool Peer-reviewed

      Tsuruhiko Nambu, Takaaki Ohnishi

      JOURNAL OF ECONOMIC INTERACTION AND COORDINATION5 ( 2 ) 181 - 189   12 2010

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

      The Nord Pool is often cited as a standard and successful electric power exchange. It was first created in Norway and developed into the power change system covering the Nordic countries. The Nord Pool provides a physical market where electricity producers and consumers/distributors meet by submitting bids for sale and purchase for 24 h time segment. If there does not exist a restraint of transmission capacity across the member countries, a single price-system price-is calculated by the intersection of the demand and supply curves, whereas if there exists congestion of transmission lines, area price instead of system price emerges. We are interested in analyzing how often and how far the two prices diverge and the probability distribution of the price ratio between system and area price. We found that the price ratio does not follow the normal distribution but the distribution is fat-tailed.

      DOI: 10.1007/s11403-010-0067-5

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    • Network motifs in an inter-firm network Peer-reviewed

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      JOURNAL OF ECONOMIC INTERACTION AND COORDINATION5 ( 2 ) 171 - 180   12 2010

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

      Firms build business relationships during economic activities. The goal of this paper is to clarify production mechanisms and economic functions by identifying characteristic patterns of inter-firm interactions. In this paper, we empirically analyze an inter-firm network consisting of about one million firms and four million directed links, in order to specify network motifs, which are small subgraphs that occur more frequently than expected in a randomly generated network. We found that V-shaped triads are network motifs, while feedforward and feedback loop are anti-motifs. By defining roles in the subgraph according to structural equivalence, we also detected the significance profile of roles characterizing the industry sector. The taxonomy of industries obtained from the profiles is economically meaningful. These empirical findings may serve to provide an easily interpretable view of the entire inter-firm network and to improve the efficiency and safety of economic systems.

      DOI: 10.1007/s11403-010-0066-6

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    • Structure analyses of a large-scale transaction network through visualization based on molecular dynamics Peer-reviewed

      K. Kamehama, T. Iino, H. Iyetomi, Y. Ikeda, T. Ohnishi, H. Takayasu, M. Takayasu

      Journal of Physics: Conference Series221 ( 1 ) 012013   2010

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      Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Physics Publishing  

      We shed light on industrial structure of the economic system in Japan by combining visualization technique and community analysis in this and an accompanying paper. Here we focus on visualization of a production network comprising submillion nodes (firms) and three million links (transaction relations). A network structure is optimized through molecular dynamics simulation with a spring-electrical model in a three-dimensional space. The lowest-energy state in the model, corresponding to a crystalline state in a physical system, is expected to give a comprehensible view on the network. Then we discuss how firms are distributed in the optimized network structure by classifying them according to sectors, sizes or regions. The distributions of firms reflect characteristics of individual classifications. Also propagation of the shock due to a recent economic scandal over the network is visualized. © 2010 IOP Publishing Ltd.

      DOI: 10.1088/1742-6596/221/1/012013

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    • Community structure in a large-scale transaction network and visualization Peer-reviewed

      T. Iino, K. Kamehama, H. Iyetomi, Y. Ikeda, T. Ohnishi, H. Takayasu, M. Takayasu

      Journal of Physics: Conference Series221 ( 1 ) 012012   2010

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      Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Physics Publishing  

      We analyze a transaction network of about 800 thousand Japanese firms to elucidate its community structure. Finding community in networks means the appearance of dense connected groups of vertices and sparse connections between groups. We adopt modularity as a quality function of communities introduced by Newman. The modularity optimization is one of effective approaches to find community. We first use a bottom-up algorithm, which makes the optimization fast by using a greedy algorithm. For the community extraction, the greedy algorithm is widely used, however, may not sufficiently optimize modularity because the optimization tends to be trapped by a local maximum especially for large-scale networks. Alternatively we propose a top-down algorithm with implementation of an annealing method and compare effectiveness of the two algorithms. We also compare the results of the community analysis with images of network structure visualized by molecular dynamics method. The vertices belonging to the same community are spatially located close to each other. The community structure determined by the modularity optimization is well reproduced in the network structure obtained by molecular dynamics. © 2010 IOP Publishing Ltd.

      DOI: 10.1088/1742-6596/221/1/012012

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    • Elucidation of industrial structure of the Japanese economy through visualization and community analysis Peer-reviewed

      H. Iyetomi, K. Kamehama, T. Iino, Y. Ikeda, T. Ohnishi, H. Takayasu, M. Takayasu

      Studies in Computational Intelligence199   645 - 652   2009

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    • Hubs and Authorities on Japanese Inter-Firm Network: Characterization of Nodes in Very Large Directed Networks Peer-reviewed

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT179 ( 179 ) 157 - 166   2009

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

      Japanese inter-firm network which consists of about one million firms and four million directed links is analyzed by evaluating PageRank, and the authority and hub scores of HITS. We show scale-free degree distribution, power-law distribution of firm-size, fat-tailed distribution of growth rate, positive correlation between degree and firm-size, and similarities between degree and these scores. By comparing with randomized networks, we find that (i) the firm with large firm-size tends to have large PageRank, and small authority and hub scores, and (ii) PageRank correlates significantly with the growth rate which is hardly observed with other quantities.

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    • Multicommunity weight-driven bipartite network model Peer-reviewed

      H. Fan, Z. Wang, T. Ohnishi, H. Saito, K. Aihara

      PHYSICAL REVIEW E78 ( 2 ) 026103   8 2008

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

      Community structure and rewiring phenomena exist in many complex networks, particularly in bipartite networks. We construct a model for the degree distribution of the rewiring problem in a multicommunity weight-driven bipartite network (MCWBN). The network consists of many interconnected communities, each of which holds a bipartite graph. The bipartite graph consists of two sets of nodes. We name each node in one set a "producer" and each node in the other set a "consumer." A weight value matrix defining the trade barrier between any two communities is used to characterize the structure of the communities, which ensures the higher preferential attachment probability in intracommunity than in intercommunity. The size of one producer is defined as the number of consumers connected to it. We find that the nonlinear dynamics of the scale of production, or the total size of all producers in each community is dependent only on the initial scale of production in each community, and independent of the distribution of the producer size. Furthermore, if the nonlinear system of the scale of production in each community is at an equilibrium state, the distribution of the producer size in each community of the MCWBN model is equivalent to that in a one-community model.

      DOI: 10.1103/PhysRevE.78.026103

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    • Dynamics of quote and deal prices in the foreign exchange market Peer-reviewed

      Takaaki Ohnishi, Hideki Takayasu, Takatoshi Ito, Yuko Hashimoto, Tsutomu Watanabe, Misako Takayasu

      JOURNAL OF ECONOMIC INTERACTION AND COORDINATION3 ( 1 ) 99 - 106   6 2008

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

      We empirically investigate price fluctuations of yen-dollar exchange rate using the high-frequency data recorded in the electronic broking system for seven-year period. The distribution of quote price changes has symmetric fat-tails approximated by a power law; however, that of deal price is asymmetrical. The autocorrelation function and diffusion of price changes indicate that quote price exhibits anti-correlation feature in short time scale, whereas deal price is essentially uncorrelated. The bid-ask spread shows power-law distribution and long range temporal correlations similar to that observed in absoute price changes.

      DOI: 10.1007/s11403-008-0033-7

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    • Temporal characteristics of moving average of foreign exchange markets Peer-reviewed

      Misako Takayasu, Takayuki Mizuno, Takaaki Ohnishi, Hideki Takayasu

      in: Practical Fruits of Econophysics (Springer Verlag, 2006)   29 - 32   1 2006

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    • Systematic tuning of optimal weighted-moving-average of yen-dollar market data Peer-reviewed

      Takaaki Ohnishi, Takayuki Mizuno, Kazuyuki Aihara, Misako Takayasu, Hideki Takayasu

      in: Practical Fruits of Econophysics (Springer Verlag, 2006)   62 - 66   1 2006

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    • Statistical properties of the moving average price in dollar-yen exchange rates Peer-reviewed

      T Ohnishi, T Mizuno, K Aihara, M Takayasu, H Takayasu

      PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS344 ( 1-2 ) 207 - 210   12 2004

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

      We introduce a weighted-moving-average analysis for the tick-by-tick data of yen-dollar exchange rates. The weights are determined automatically for given data by applying the Yule-Walker formula for autoregressive model. Although the data are non-stationary, the resulting moving average gives a quite nice property that the deviation around the moving-average becomes a white noise. The weights decay exponentially with time scale less than 2 min implying that dealers are watching only very recent market state. (C) 2004 Published by Elsevier B.V.

      DOI: 10.1016/j.physa.2004.06.118

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    Misc.

    • 高分子の高次構造特徴量ー物性相関としてのサイバーポリマー

      天本義史, 菊武裕晃, 大西立顕

      高分子70 ( 3 ) 133 - 134   3 2021

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    • 流動人口ビッグデータによる外出の自粛率の見える化

      水野 貴之, 大西 立顕, 渡辺 努

      人工知能35 ( 5 ) 667 - 672   9 2020

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    • トピック間の階層構造を考慮したGaussian LDAの構成

      吉田崇裕, 久野遼平, 大西立顕

      研究報告自然言語処理(NL)2019-NL-241 ( 6 ) 1 - 8   8 2019

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    • 経済バブルの数理モデリング

      大西立顕, 渡辺努

      数理科学 2019年6月号 No.67257 ( 6 ) 15 - 21   6 2019

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    • 不動産分野へのデータ解析と人工知能技術の応用

      和泉潔, 諏訪博彦, 大西立顕, 坂地泰紀, 松島裕康

      不動産テックを考える,赤木正幸,浅見泰司,谷山智彦編,プログレス   75 - 89   5 2019

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    • 電話帳データを活用した買い物・医療困難地域の検出

      大西立顕, 水野貴之, 渡辺努

      計測自動制御学会 システム・情報部門社会システム部会 第18回社会システム部会研究会資料   174   3 2019

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    • 隠れマルコフモデルとランダムフォレストによるマウスの睡眠ステージ判定

      松崎舜, 坂口昌徳, 大西立顕

      信学技報 NLP2018-123118 ( 413 ) 143 - 148   1 2019

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      Language:Japanese  

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    • 物理による社会学

      F. シュヴァイツァー著, 大西立顕訳

      パリティ 2018年12月号33 ( 12 ) 30 - 38   12 2018

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    • ランダムフォレストによるマウス脳波時系列を用いた睡眠ステージ判定

      松崎舜, 坂口昌徳, 大西 立顕

      研究報告数理モデル化と問題解決(MPS)2018-MPS-120 ( 12 ) 1 - 6   9 2018

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    • 国勢調査と電話帳データから推定した全国における高齢者の生活環境の地域差

      大西立顕, 水野貴之, 渡辺努

      研究報告高齢社会デザイン(ASD)2018-ASD-12 ( 2 ) 1 - 5   6 2018

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    • 臨界現象の研究による経済制御の可能性

      大西立顕

      全・地球学1996-2017 フォーラム「地球学の世紀」22年 134人の知の試み,松井孝典監修   446 - 447   3 2018

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    • 電話帳データから観測した都市の成長・衰退のダイナミクス

      大西立顕, 水野貴之, 渡辺努

      計測自動制御学会 システム・情報部門社会システム部会 第15回社会システム部会研究会資料   247   3 2018

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    • 位置情報ビッグデータによるデモ参加者の人流解析

      水野貴之, 大西立顕, 渡辺努

      計測自動制御学会 システム・情報部門社会システム部会 第15回社会システム部会研究会資料   9 - 13   3 2018

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    • 類似企業の株価差を利用した株式バブルのナウキャスト

      水野貴之, 大西立顕, 渡辺努

      計測自動制御学会 システム・情報部門社会システム部会 第12回社会システム部会研究会資料   107   3 2017

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    • 世界の株式市場の相関構造分析

      木村笙子, 大西立顕

      計測自動制御学会 システム・情報部門社会システム部会 第12回社会システム部会研究会資料   169 - 176   3 2017

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    • 位置情報付きTwitterデータから算出した都市間の人の移動ネットワーク

      大西立顕, 水野貴之, 渡辺努

      計測自動制御学会 システム・情報部門社会システム部会 第12回社会システム部会研究会資料   246   3 2017

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    • 正規分布とベキ分布 経済物理学の基礎知識

      大西立顕

      週刊エコノミスト2016年5月31日号   26   5 2016

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    • 経済学が目を背けてきたバブル ゆらぎで定量化に成功

      大西立顕

      週刊エコノミスト2016年5月31日号   30 - 31   5 2016

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    • 移住と人口密度の相関の普遍性

      藤本祥二, 大西立顕, 清水千弘, 水野貴之, 渡辺努

      統計数理研究所共同研究リポート360 経済物理とその周辺(360)   39 - 47   3 2016

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    • k近傍法による中古マンション売買価格の分析

      大西立顕, 水野貴之, 清水千弘, 渡辺努

      統計数理研究所共同研究リポート360 経済物理とその周辺(360)   66 - 69   3 2016

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    • データサイエンティスト育成と利活用のベスト・プラクティス

      丸山宏, 神谷直樹, 樋口知之, 竹村彰道, 大西立顕

      情報処理学会デジタルプラクティス6 ( 3 ) 223 - 229   7 2015

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    • 中古マンション売買データを用いた同一需給圏と不動産バブルの推定

      大西立顕, 水野貴之, 清水千弘, 家富洋, 渡辺努

      SICEシステム・情報部門社会システム部会第8回社会システム部会研究会資料   107 - 112   3 2015

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    • 実データを用いた企業間振込ネットワークにおけるページランクと振込総額の統計性とその応用

      石井晃, 大西立顕, 新井康平, 大浦啓輔, 戸谷圭子

      SICEシステム・情報部門社会システム部会第7回社会システム部会研究会資料   53 - 58   9 2014

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    • 日本の人口分布と可住地面積分布のスケーリング則と河川地形の関係

      藤本祥二, 大西立顕, 清水千弘, 水野貴之, 渡辺努

      統計数理研究所共同研究リポート311 経済物理とその周辺(10)   82 - 90   3 2014

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    • 企業間振込ネットワークにおけるページランクと振込総額の統計性

      大西立顕, 石井晃

      統計数理研究所共同研究リポート311 経済物理とその周辺(10)   64 - 68   3 2014

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    • スケールフリーネットワーク

      大西立顕

      応用数理ハンドブック,薩摩順吉,大石進一,杉原正顕編,朝倉書店   248 - 249   11 2013

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    • 経済ネットワークの数理

      大西立顕

      横幹7 ( 2 ) 100 - 107   10 2013

    • 米国における住宅の価格分布と差押え率

      大西立顕, 水野貴之, 清水千弘, 家富洋, 渡辺努

      統計数理研究所共同研究リポート292 経済物理とその周辺(9)   8 - 11   3 2013

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    • 日本の人口分布と可住地面積分布のスケーリング則

      藤本祥二, 大西立顕, 清水千弘, 水野貴之, 渡辺努

      統計数理研究所共同研究リポート292 経済物理とその周辺(9)   12 - 18   3 2013

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    • 非定常性に挑む外国為替市場の科学

      大西立顕

      システム/制御/情報:システム制御情報学会誌56 ( 10 ) 550 - 555   10 2012

    • 日本に於ける人口分布・可住地分布のクラスタ解析

      藤本祥二, 大西立顕, 清水千弘, 水野貴之, 渡辺努

      統計数理研究所共同研究リポート271 経済物理とその周辺(8)   57 - 63   3 2012

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    • 円ドル為替レートの非定常性

      大西立顕, 高安秀樹, 伊藤隆敏, 橋本優子, 渡辺努, 高安美佐子

      統計数理研究所共同研究リポート271 経済物理とその周辺(8)   64 - 69   3 2012

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    • 企業間取引ネットワークの role 解析

      大西立顕, 高安秀樹, 高安美佐子

      統計数理研究所共同研究リポート259 経済物理とその周辺(7)   55 - 59   3 2011

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    • 最適移動平均で求める変動の実相

      大西立顕

      金融財政ビジネス, 時事通信社, 2010年12月9日 第10128号   10 - 12   12 2010

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    • 企業間取引ネットワークのページランク

      大西立顕, 高安秀樹, 高安美佐子

      情報処理学会研究報告2010-MPS-81   1 - 3   12 2010

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    • 企業間ネットワークの数理構造

      大西立顕, 高安秀樹, 高安美佐子

      応用数理20 ( 3 ) 37 - 49   9 2010

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    • 企業間取引ネットワークのモチーフ構造

      大西立顕, 高安秀樹, 高安美佐子

      統計数理研究所共同研究リポート241 経済物理とその周辺(6)   63 - 67   3 2010

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    • 企業の評価 新たな視点で

      大西立顕

      日経・経済教室セレクション2, 日本経済新聞社編, 日本経済新聞出版社   418 - 422   3 2010

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    • 企業間取引の大規模ネットワーク構造からみた企業の特徴

      大西立顕

      東京大学情報基盤センター・スーパーコンピューティングニュース12 ( Special Issue 1 ) 95 - 106   2 2010

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    • Mathematical analysis of large-scale business and economic data(大規模データから探る経済現象の数理)

      Takaaki Ohnishi

      Mathematical Bulletin of the Graduate School of Science Josai University(城西大学大学院理学研究科研究業績集(数学専攻))11   97 - 131   5 2009

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    • 分子動力学法を用いた企業間取引の有向ネットワーク構造の可視化

      亀浜紘祐, 飯野隆史, 家富洋, 池田裕一, 大西立顕, 高安秀樹, 高安美佐子

      統計数理研究所共同研究リポート226 経済物理とその周辺(5)   74 - 86   3 2009

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    • 大規模取引ネットワークのコミュニティ分析

      飯野隆史, 小林祐貴, 亀浜紘祐, 家富洋, 池田裕一, 大西立顕, 高安秀樹, 高安美佐子

      統計数理研究所共同研究リポート226 経済物理とその周辺(5)   56 - 63   3 2009

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    • 円ドル為替市場における指値価格と約定価格の統計性

      大西立顕, 高安秀樹, 伊藤隆敏, 橋本優子, 渡辺努, 高安美佐子

      統計数理研究所共同研究リポート226 経済物理とその周辺(5)   32 - 39   3 2009

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    • ページランクとオーソリティ・ハブによる企業間取引の有向ネットワーク解析

      大西立顕, 高安秀樹, 高安美佐子

      統計数理研究所共同研究リポート226 経済物理とその周辺(5)   23 - 31   3 2009

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    • Unscented Kalman Filterを用いた外国為替時系列の非線形性の考察と局所2次近似予測法の提案

      永田育真, 大西立顕, 合原一幸

      統計数理研究所共同研究リポート226 経済物理とその周辺(5)   9 - 22   3 2009

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    • 経済データの数理

      大西立顕

      社会を変える驚きの数学, 合原一幸編著, ウェッジ選書   216 - 220   6 2008

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    • 市場分断が常態化するノルドプールの卸電力価格形成の実状

      南部鶴彦, 大西立顕

      エネルギーフォーラム 第54巻641号   70 - 74   5 2008

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    • 北欧電力卸売市場の経済物理学的解析

      大西立顕, 水野貴之, 大藤健太, 南部鶴彦

      社会経済研究56   15 - 24   2 2008

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    • 市場価格時系列のトレンド抽出

      大西立顕, 合原一幸, 高安美佐子, 高安秀樹

      統計数理研究所共同研究リポート187 経済物理とその周辺(2)   1 - 9   3 2006

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    • 最適移動平均した為替レートの統計性

      水野貴之, 大西立顕, 中野徹, 高安美佐子, 高安秀樹

      第59回日本物理学会講演概要集、第2分冊2   p.199   9 2004

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    • 為替の移動平均価格の統計的特性

      大西立顕, 合原一幸, 高安美佐子, 高安秀樹

      素粒子論研究108 ( 4 ) D24   1 2004

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    • 市場価格変動のスピンモデル

      大西立顕, 合原一幸

      信学技報 NLP2002-19   69 - 72   6 2002

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    • 株価変動のマルチフラクタル解析

      大西立顕, 合原一幸

      信学技報 NLP2001-114   93 - 100   3 2002

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    • 時空間学習とニューロンの応答特性

      大西立顕, 合原一幸

      信学技報 NLP2000-42 NC2000-36   87 - 94   6 2000

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    Presentations

    • Indicator of the Number of Stores and Facilities Suitable for Urban Population Using Scaling Exponents

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Social Informatics 2019  11 2019 

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    • Applying a Change-point Detection Method to Housing Market Data

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Conference on Complex Systems 2019  10 2019 

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    • Dimension Reduction of Molecular Fingerprints

      Takaaki Ohnishi, Mariko Ito

      Conference on Complex Systems 2019  10 2019 

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    • Using two-dimensional Kolmogorov-Smirnov statistics to characterize allometric scaling between population and number of facilities

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      FENS 2019 - 10th Polish Symposium on Physics in Economy and Social Sciences  7 2019 

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    • Continuous increases or decreases in city sizes observed in Japanese telephone directory data

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      DPG Spring Meeting  2 4 2019 

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    • Directional patterns of city size changes in Japan International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      The Computational Social Science Society of the Americas CSS 2018  10 2018 

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      Language:English   Presentation type:Poster presentation  

      Venue:Santa Fe, NM  

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    • The dynamics of city growth observed in Japanese telephone directory data International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Conference on Complex Systems 2018  9 2018 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Thessaloniki, Greece  

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    • Statistical laws of urban development and decline International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      The 23rd Annual Workshop on Economic Science with Heterogeneous Interacting Agents (WEHIA 2018)  6 2018 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:International Christian University (ICU), Japan  

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    • Quantification of spatial collocation patterns of shops and facilities using the two-dimensional Kolmogorov-Smirnov statistic International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      13th German Probability and Statistics Days 2018  2 2018 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Freiburg, Germany  

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    • Three State Model for Temporal Network Change Detection International conference

      Chikara Mizokami, Takaaki Ohnishi

      NetSci-X 2018: International School and Conference on Network Science  1 2018 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Hangzhou, China  

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    • Use of the two-dimensional Kolmogorov-Smirnov test to measure spatial concentration in geospatial data International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      11th International Conference on Computational and Financial Econometrics (CFE 2017)  12 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:London, UK  

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    • Revealing Persistent Structure of International Trade by Nonnegative Matrix Factorization International conference

      Chikara Mizokami, Takaaki Ohnishi

      COMPLEX NETWORKS 2017: The 6th International Conference on Complex Networks and Their Applications  11 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Lyon, France  

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    • Irresponsible communities in global supply chain International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      COMPLEX NETWORKS 2017: The 6th International Conference on Complex Networks and Their Applications  11 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Lyon, France  

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    • International Trade Relationship from a Multilateral Point of View International conference

      Hiroshi Iyetomi, Yuichi Ikeda, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      COMPLEX NETWORKS 2017: The 6th International Conference on Complex Networks and Their Applications  11 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Lyon, France  

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    • How to guard company's supply-chain risks by global inter-firm relationships International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      Conference on Complex Systems 2017  9 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Cancun, Mexico  

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    • Characteristic Spatial Interaction between Shops and Facilities in Japan International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Conference on Complex Systems 2017  9 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Cancun, Mexico  

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    • Using Network Motif Analysis to Characterize the International Trade Network International conference

      T. Ohnishi, T. Mizuno, Y. Ikeda, H. Iyetomi, T. Watanabe

      SigmaPhi2017  7 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Corfu, Greece  

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    • Exploiting global buyer-supplier networks to improve supply chain due diligence International conference

      T. Mizuno, T. Ohnishi, T. Watanabe

      SigmaPhi2017  7 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Corfu, Greece  

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    • A countermeasure for supply-chain risks based on structure of global buyer-supplier network International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      8th Conference on Complex Networks (CompleNet'17)  3 2017 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Dubrovnik, Croatia  

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    • Daily living area detection using mobility network map equation International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      COMPLEX NETWORKS 2016: The 5th International Conference on Complex Networks and Their Applications  11 2016 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Milan, Italy  

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    • Scaling relations between population and number of facilities International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Dynamics Days Latin America and the Caribbean  10 2016 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Puebla, Mexico  

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    • Scaling analysis of urban agglomeration observed in Japanese phone directory data International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Conference on Complex Systems 2016  9 2016 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Amsterdam, Netherlands  

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    • Study of Quantitative Indicators for Urban Renewal by Utilizing Cultural Policy in Depopulated Areas International conference

      Yasuko Kawahata, Takaaki Ohnishi

      Asia-Pacific Econophysics Conference 2016  8 2016 

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      Language:English   Presentation type:Poster presentation  

      Venue:Tokyo, Japan  

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    • Characterizing industry agglomeration in Japan using urban allometric scaling International conference

      Takaaki Ohnishi, Takayuki Mizuno, Tsutomu Watanabe

      Challenges in Data Science  7 2016 

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      Venue:Matera, Italy  

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    • Power Law of Market Capitalization and Stock Market Bubble International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      22nd International Conference on Computing in Economics and Finance (CEF 2016)  6 2016 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Bordeaux, France  

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    • Urban scaling observed in Japanese telephone book data International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Tsutomu Watanabe

      80th Annual Conference of the DPG  3 2016 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Regensburg, Germany  

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    • Real estate valuation using k-nearest neighbor regression International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Hiroshi Iyetomi, Tsutomu Watanabe

      Econophysics-2015  12 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:New Delhi, India  

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    • Inter-firm money transfers: a weighted network analysis International conference

      Michiaki Nakaya, Takaaki Ohnishi, Akira Ishii, Keiko Toya

      Challenges in Data Science: a Complex Systems Perspective  10 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Torino, Italy  

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    • Footprints of conflict minerals on global supply-chain network International conference

      Takayuki Mizuno, Takaaki Ohnishi, Hiroshi Iyetomi, Yuichi Ikeda, Tsutomu Watanabe

      Challenges in Data Science: a Complex Systems Perspective  10 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Torino, Italy  

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    • Using k-nearest neighbor method to estimate real estate prices International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Hiroshi Iyetomi, Tsutomu Watanabe

      Econophysics Colloquium 2015  9 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Prague, Czech Republic  

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    • Structure of global buyer-supplier networks and its implications for conflict minerals regulations International conference

      Takayuki Mizuno, Takaaki Ohnishi, Hiroshi Iyetomi, Yuichi Ikeda, Tsutomu Watanabe

      CCS'15  9 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Tempe, Arizona  

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    • Relationship between job opportunities and economic environments measured from data in internet job searching sites International conference

      Aki-Hiro Sato, Chihiro Shimizu, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      19th International Conference on Knowledge-Based and Intelligent Information & Engineering Systems (KES2015)  9 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Singapore  

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    • Estimating the Size of Market Areas and Bubbles in the Japanese Housing Market International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Hiroshi Iyetomi, Tsutomu Watanabe

      CCS'15  9 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Tempe, Arizona  

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    • Probable contribution of Data-driven investigation to solve problems in aging society International conference

      Aki-Hiro Sato, Chihiro Shimizu, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      Asia-Pacific Econophysics Conference 2015  7 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Singapore  

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    • Network Motifs in the World Trade Network International conference

      Takaaki Ohnishi, Takayuki Mizuno, Yuichi Ikeda, Hiroshi Iyetomi, Tsutomu Watanabe

      NetSci2015  6 2015 

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      Language:English   Presentation type:Poster presentation  

      Venue:Zaragoza, Spain  

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    • Estimating firm-level risk in global inter-firm networks International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      NetSci2015  6 2015 

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      Language:English   Presentation type:Poster presentation  

      Venue:Zaragoza, Spain  

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    • Community Structure and Synchronization of the Industry Sector Specific Trade Network International conference

      Yuichi Ikeda, Hiroshi Iyetomi, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      NetSci2015  6 2015 

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      Language:English   Presentation type:Poster presentation  

      Venue:Zaragoza, Spain  

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    • Global inter-firm networks and stock price correlations International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      6th Workshop on Complex Networks  3 2015 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:New York City, New York  

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    • Identification of network effect in the buyer-seller network International conference

      R. Hisano, T. Mizuno, T. Ohnishi, T. Watanabe

      8th International Conference on Computational and Financial Econometrics (CFE 2014)  12 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Pisa, Italy  

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    • Financial bubble detection using cross-sectional dispersion of price earnings ratios International conference

      T. Mizuno, T. Ohnishi, T. Watanabe

      8th International Conference on Computational and Financial Econometrics (CFE 2014)  12 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Pisa, Italy  

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    • The structure of global inter-firm networks International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutom Watanabe

      SEDNAM: Socio-Economic Dynamics, Networks and Agent-based Models  11 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Barcelona, Spain  

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    • Community Structure and Dynamics of the Industry Sector Specific International Trade Network International conference

      Yuichi Ikeda, Hiroshi Iyetomi, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      The 10th International Conference on Signal Image Technology & Internet Based Systems  11 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Marrakesh, Morocco  

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    • Empirical Agent-Based Modeling for Customer Portfolio Management: A Case of a Regional B2B Financial Service in Japan International conference

      Makoto Mizuno, Kohei Arai, Akira Ishii, Yutaro Nemoto, Takaaki Ohnishi, Kosuke Oura, Kanako Ozawa, Keiko Toya

      6th Annual Complexity in Business Conference  10 2014 

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      Venue:Washington, D.C.  

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    • The structure of global inter-firm networks International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutom Watanabe

      Complex Networks in International Economics (Satellite meeting of ECCS'14)  9 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Lucca, Italy  

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    • Simulating Value Co-Creation in B2B Financial Service: An Application of Empirical Agent-Based Modeling International conference

      Makoto Mizuno, Keiko Toya, Kana Ozawa, Mayomi Haga, Yutaro Nemoto, Kohei Arai, Keisuke Oura, Akira Ishii, Takaaki Ohnishi

      Social Simulation Conference 2014 (SSC2014)  9 2014 

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      Language:English   Presentation type:Poster presentation  

      Venue:Barcelona, Spain  

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    • Network Analysis of inter-firm payment flows using real monetary transaction records between firms International conference

      T. Ohnishi, A. Ishii, K. Arai, K. Oura, K. Toya

      The 2nd international conference on Serviceology (ICServ2014)  9 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Yokohama, Japan  

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    • Locality and universality of population distribution International conference

      S. Fujimoto, T. Mizuno, T. Ohnishi, C. Shimizu, T. Watanabe

      Computationally Intensive Methods in Statistics and Econometrics (Satellite meeting of COMPSTAT 2014)  8 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Neuchtel, Switzerland  

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    • Large scale empirical analysis of buyer-seller network and its role in the business cycle International conference

      R. Hisano, T. Mizuno, T. Ohnishi, T. Watanabe

      Computationally Intensive Methods in Statistics and Econometrics (Satellite meeting of COMPSTAT 2014)  8 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Neuchtel, Switzerland  

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    • Forecasting volatility using financial big data sets International conference

      T. Mizuno, T. Ohnishi, T. Watanabe

      Computationally Intensive Methods in Statistics and Econometrics (Satellite meeting of COMPSTAT 2014)  8 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Neuchtel, Switzerland  

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    • Network analysis of inter-firm payment flows using real monetary transaction records between firms International conference

      T. Ohnishi, A. Ishii, K. Arai, K. Oura, K. Toya

      International Conference on Statistical Physics (SigmaPhi 2014)  7 2014 

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      Language:English   Presentation type:Poster presentation  

      Venue:Rhodes, Greece  

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    • Exogenous shocks in financial markets: Novelty and topicality detection in business news International conference

      T. Mizuno, T. Ohnishi, T. Watanabe

      International Conference on Statistical Physics (SigmaPhi 2014)  7 2014 

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      Language:English   Presentation type:Poster presentation  

      Venue:Rhodes, Greece  

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    • Community Structure and Wealth Transfer on Trade Network International conference

      Yuichi Ikeda, Hiroshi Iyetomi, Tsutomu Watanabe, Takaaki Ohnishi, Takayuki Mizuno

      NetSci2014  6 2014 

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      Language:English   Presentation type:Poster presentation  

      Venue:Berkeley, California  

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    • Applying PageRank to interfirm money transfer network International conference

      Takaaki Ohnishi, Akira Ishii, Keiko Toya

      NetSci2014  6 2014 

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      Language:English   Presentation type:Poster presentation  

      Venue:Berkeley, California  

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    • Use of house price distribution for estimating a local bubble indicator International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Hiroshi Iyetomi, Tsutomu Watanabe

      11th German Probability and Statistics Days 2014  3 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Ulm, Germany  

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    • Financial market reactions to exogenous shocks International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      ECONOPHYS-KOLKATA VIII  3 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Kolkata, India  

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    • Exogenous shocks in financial markets: Statistical analysis using business news International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      11th German Probability and Statistics Days 2014  3 2014 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Ulm, Germany  

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    • Network analysis of inter-firm payment flows International conference

      Takaaki Ohnishi, Akira Ishii

      ESHIA Winter Workshop 2013  11 2013 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Singapore  

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    • Estimating the Effects of Exogenous Shocks Using Business News and Stock Market Data International conference

      Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      ESHIA Winter Workshop 2013  11 2013 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Singapore  

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    • Measuring the likelihood of housing bubbles: a spatio-temporal analysis International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Hiroshi Iyetomi, Tsutomu Watanabe

      European Conference on Complex Systems 2013  9 2013 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Barcelona, Spain  

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    • The Mechanism behind Power-Law Distribution of Housing Prices International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Hiroshi Iyetomi, Tsutomu Watanabe

      Statphys 25  7 2013 

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      Language:English   Presentation type:Poster presentation  

      Venue:Seoul, Korea  

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    • Colored Motifs in Japanese Inter-firm Network International conference

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      4th Workshop on Complex Networks  3 2013 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Berlin, Germany  

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    • Using Property Price Distribution to Detect Real Estate Bubbles International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Tsutomu Watanabe

      6th CSDA International Conference on Computational and Financial Econometrics (CFE 2012)  12 2012 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Oviedo, Spain  

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    • Spatial Heterogeneity and Real Estate Bubble Invited International conference

      Takaaki Ohnishi

      ECONOPHYS-KOLKATA VII  11 2012 

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      Language:English   Presentation type:Oral presentation (invited, special)  

      Venue:Kolkata, India  

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    • Structure and function of inter-firm relationships revealed by network motif analysis International conference

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      XXXII Dynamics Days Europe  9 2012 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Gothenburg, Sweden  

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    • Replication of Non-Trivial Directional Motion in Multi-Scales Observed by Runs Test International conference

      Yoshihiro Yura, Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      Latsis Symposium 2012  9 2012 

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      Language:English   Presentation type:Poster presentation  

      Venue:Zurich, Switzerland  

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    • Habitable Area Distributions as a External Factor of the Population Distributions in Japan International conference

      Shouji Fujimoto, Takayuki Mizuno, Takaaki Ohnishi, Chihiro Shimizu, Tsutomu Watanabe

      XXXII Dynamics Days Europe  9 2012 

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      Language:English   Presentation type:Poster presentation  

      Venue:Gothenburg, Sweden  

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    • Using Network Motif Analysis to Characterize Inter-firm Transactions International conference

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      NetSci2012  6 2012 

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      Language:English   Presentation type:Poster presentation  

      Venue:Evanston, Ilinois  

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    • Social Networks in Business News International conference

      Takayuki Mizuno, Ryohei Hisano, Takaaki Ohnishi, Tsutomu Watanabe

      17th Annual Workshop on Economic Heterogeneous Interacting Agents  6 2012 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Paris, France  

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    • Habitable Area Distribution as Conditional of Population Distribution International conference

      Shouji Fujimoto, Takayuki Mizuno, Takaaki Ohnishi, Chihiro Shimizu, Tsutomu Watanabe

      17th Annual Workshop on Economic Heterogeneous Interacting Agents  6 2012 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Paris, France  

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    • House price distribution and bubbles in Japan and the U.S. International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Tsutomu Watanabe

      10th German Probability and Statistics Days 2012  3 2012 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Mainz, Germany  

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    • Time-frequency analysis of company news International conference

      Takayuki Mizuno, Kazumasa Takei, Takaaki Ohnishi, Tsutomu Watanabe

      European Conference on Complex Systems 2011  9 2011 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Vienna, Austria  

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    • Recurrence interval analysis of high-frequency returns on foreign exchange International conference

      Takaaki Ohnishi, Hideki Takayasu, Takatoshi Ito, Yuko Hashimoto, Tsutomu Watanabe, Misako Takayasu

      European Conference on Complex Systems 2011  9 2011 

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      Language:English   Presentation type:Poster presentation  

      Venue:Vienna, Austria  

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    • Cluster analysis of the population in Japan International conference

      Shouji Fujimoto, Chihiro Shimizu, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

      European Conference on Complex Systems 2011  9 2011 

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      Language:English   Presentation type:Poster presentation  

      Venue:Vienna, Austria  

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    • On the evolution of the house price distribution Invited International conference

      Takaaki Ohnishi

      the 58th World Statistics Congress of the International Statistical Institute (ISI)  8 2011 

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      Language:English   Presentation type:Oral presentation (invited, special)  

      Venue:Dublin, Ireland  

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    • Characteristics of bubble in house price distribution of Japan International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Tsutomu Watanabe

      International Conference on Statistical Physics (SigmaPhi 2011)  7 2011 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Larnaca, Cyprus  

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    • Time-frequency analysis of company news International conference

      Takayuki Mizuno, Kazumasa Takei, Takaaki Ohnishi, Tsutomu Watanabe

      International Workshop on Coping Crises in Complex Socio-Economic Systems  6 2011 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Zurich, Switzerland  

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    • Detection of bubbles in Japanese house prices International conference

      Takaaki Ohnishi, Takayuki Mizuno, Chihiro Shimizu, Tsutomu Watanabe

      International Workshop on Coping with Crises in Complex Socio-Economic Systems 2011  6 2011 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Zurich, Switzerland  

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    • A comprehensive directional motion analysis of market fluctuations International conference

      Takaaki Ohnishi, Hideki Takayasu, Takatoshi Ito, Yuko Hashimoto, Tsutomu Watanabe, Misako Takayasu

      International Conference on Econophysics 2011  6 2011 

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      Language:English   Presentation type:Poster presentation  

      Venue:Shanghai, China  

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    • The market impact of company news in NYSE International conference

      Takayuki Mizuno, Kazumasa Takei, Takaaki Ohnishi, Tsutomu Watanabe

      First Workshop on Quantitative Finance and Economics  2 2011 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Tokyo, Japan  

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    • Detecting and analyzing nonstationarity in foreign exchange market International conference

      Takaaki Ohnishi, Hideki Takayasu, Takatoshi Ito, Yuko Hashimoto, Tsutomu Watanabe, Misako Takayasu

      Econophysics Colloquium 2010  11 2010 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Taipei, Taiwan  

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    • PageRank for characterizing growth possibility in Japanese inter-firm network International conference

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      2nd Workshop on Complex Networks  10 2010 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Rio de Janeiro, Brazil  

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    • Structural motif-based classification of nodes in Japanese inter-firm network International conference

      Takaaki Ohnishi, Hideki Takayasu, Misako Takayasu

      Statphys 24  7 2010 

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      Language:English   Presentation type:Poster presentation  

      Venue:Cairns, Australia  

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    • The role of strongly-connected components in the network of Japanese companies International conference

      S. Sameshima, T. Ohnishi, H. Takayasu, M. Takayasu

      Applications of Physics in Financial Analysis 7  3 2009 

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      Language:English   Presentation type:Poster presentation  

      Venue:Tokyo, Japan  

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    • Network Motifs in Inter-firm Network International conference

      T. Ohnishi, H. Takayasu, M. Takayasu

      Applications of Physics in Financial Analysis 7  3 2009 

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      Venue:Tokyo, Japan  

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    • Dynamics of deal price in foreign exchange market International conference

      Takaaki Ohnishi, Hideki Takayasu, Takatoshi Ito, Yuko Hashimoto, Tsutomu Watanabe, Misako Takayasu

      Econophysics Colloquium and Third Bonzenfreies Colloquium  11 2006 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Tokyo, Japan  

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    • Characterization of Temporal Behavior of Foreign Exchange Markets International conference

      Misako Takayasu, Takaaki Ohnishi, Takayuki Mizuno, Hideki Takayasu

      First International Workshop on Intelligent Finance, A Convergence of Mathematical Finance with Technical and Fundamental Analysis  12 2004 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Melbourne, Australia  

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    • Systematic tuning of optimal weighted-moving-average of yen-dollar market data International conference

      Takaaki Ohnishi, Takayuki Mizuno, Kazuyuki Aihara, Misako Takayasu, Hideki Takayasu

      The Third Nikkei Econophysics Symposium -Practical Fruits of Econophysics-  11 2004 

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      Language:English   Presentation type:Poster presentation  

      Venue:Tokyo, Japan  

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    • Statistical properties of the moving average price in dollar-yen exchange rates International conference

      Takaaki Ohnishi, Kazuyuki Aihara, Misako Takayasu, Hideki Takayasu

      Applications of Physics in Financial Analysis 4  11 2003 

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      Language:English   Presentation type:Poster presentation  

      Venue:Warsaw, Poland  

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    • Neural Response and Spatio-temporal Learning International conference

      Takaaki Ohnishi, Kazuyuki Aihara

      International Symposium on Nonlinear Theory and its Applications 2001  10 2001 

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      Language:English   Presentation type:Oral presentation (general)  

      Venue:Miyagi, Japan  

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    Professional Memberships

    •  
      JAPAN ASSOCIATION FOR EVOLUTIONARY ECONOMICS

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      INFORMATION PROCESSING SOCIETY OF JAPAN

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    •  
      JAPANESE ECONOMIC ASSOCIATION

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      THE PHYSICAL SOCIETY OF JAPAN

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    Research Projects

    • 地理空間ビッグデータとスパコンを用いた高齢者の生活基盤評価

      日本学術振興会  科学研究費補助金 挑戦的研究(萌芽) 

      大西 立顕

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      6 2019 - 3 2022

      Authorship:Principal investigator  Grant type:Competitive

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    • 複雑ネットワーク解析に基づく物質・材料探索

      文部科学省  科学研究費補助金 新学術領域研究(研究領域提案型) 

      大西立顕

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      4 2017 - 3 2022

      Authorship:Principal investigator  Grant type:Competitive

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    • 人口・産業集積の時空間ビッグデータにみられる相転移挙動の計算科学的研究

      日本学術振興会  科学研究費補助金 基盤研究(B) (一般) 

      大西立顕

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      4 2016 - 3 2020

      Authorship:Principal investigator  Grant type:Competitive

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    • 地域社会における生活基盤の持続可能性指標の開発

      日本学術振興会  課題設定による先導的人文学・社会科学研究推進事業 実社会対応プログラム 

      大西立顕

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      10 2015 - 9 2018

      Authorship:Principal investigator  Grant type:Competitive

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      日本学術振興会  科学研究費補助金 挑戦的萌芽研究 

      大西立顕

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      4 2014 - 3 2016

      Authorship:Principal investigator  Grant type:Competitive

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    • 大規模経済データにみられる相転移挙動の計算科学的研究

      日本学術振興会  科学研究費補助金 若手研究(A) 

      大西立顕

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      4 2011 - 3 2015

      Authorship:Principal investigator  Grant type:Competitive

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      日本学術振興会  科学研究費補助金 挑戦的萌芽研究 

      大西立顕

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      4 2012 - 3 2013

      Authorship:Principal investigator  Grant type:Competitive

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      日本学術振興会  科学研究費補助金 若手研究(B) 

      大西立顕

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      4 2008 - 3 2011

      Authorship:Principal investigator  Grant type:Competitive

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