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Doi Shohei
| Faculty of Public Policy Public Policy Public Policy | Associate Professor |
For more details, please see my website.
Researcher basic information
■ Degree■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
- 30889134
- Y-4718-2018
Research Field■ Educational Organization
- Bachelor's degree program, School of Law
- Master's degree program, Graduate School of Law
- Doctoral (PhD) degree program, Graduate School of Law
- Professional degree program, Graduate School of Public Policy
Career
■ CareerCareer
- Jan. 2023 - Present
Ministry of Finance, Policy Research Institute, Ministry Of Finance, JAPAN, Special Research Officer, Japan - Apr. 2022 - Present
Hokkaido University, Public Policy School, Associate Professor - Apr. 2021 - Present
National Institute of Informatics, Information and Society Research Division, Visiting Associate Professor, Japan - Oct. 2020 - Present
Hokkaido University, Graduate School of Law, Associate Professor, Japan - Oct. 2020 - Mar. 2021
Hokkaido University, Public Policy School, Associate Professor, Japan - Mar. 2019 - Mar. 2021
National Institute of Informatics, Information and Society Research Division, Project Researcher - Apr. 2020 - Sep. 2020
Japan Society for the Promotion of Science, Postdoctoral Fellow, Japan - Apr. 2015 - Mar. 2018
Japan Society for the Promotion of Science, Research Fellow - Mar. 2016 - Jun. 2016
Princeton University, Department of Politics, Visiting Student Research Collaborator
Research activity information
■ Awards- Nov. 2022, The Japanese Society for Artificial Intelligence, JSAI Annual Conference Award
Visualizing National Economic Security Risk through Network Power Flow: Transparency in supply chain and ownership
Takayuki Mizuno;Shohei Doi;Shuhei Kurizsaki - Nov. 2021, The Japanese Society for Artificial Intelligence, JSAI Annual Conference Award
The Connection between Investors and Anti-ESG Firms in Global Ownership Network: Dilemma in Socially Responsible Investing
Takayuki Mizuno;Shohei Doi;Takahiro Tsuchiya;Shuhei Kurizsaki - Mar. 2019, Kyoto University, Dissertation Award
Shohei Doi - May 2015, Japan Student Service Organization, Grant for Outstanding Achievement
Shohei Doi
- Analyzing political party positions through multi-language twitter text embeddings
Jinghui Chen; Takayuki Mizuno; Shohei Doi
Frontiers in Big Data, 7, Frontiers Media SA, 30 May 2024, [Peer-reviewed]
Scientific journal, Traditional monolingual word embedding models transform words into high-dimensional vectors which represent semantics relations between words as relationships between vectors in the high-dimensional space. They serve as productive tools to interpret multifarious aspects of the social world in social science research. Building on the previous research which interprets multifaceted meanings of words by projecting them onto word-level dimensions defined by differences between antonyms, we extend the architecture of establishing word-level cultural dimensions to the sentence level and adopt a Language-agnostic BERT model (LaBSE) to detect position similarities in a multi-language environment. We assess the efficacy of our sentence-level methodology using Twitter data from US politicians, comparing it to the traditional word-level embedding model. We also adopt Latent Dirichlet Allocation (LDA) to investigate detailed topics in these tweets and interpret politicians' positions from different angles. In addition, we adopt Twitter data from Spanish politicians and visualize their positions in a multi-language space to analyze position similarities across countries. The results show that our sentence-level methodology outperform traditional word-level model. We also demonstrate that our methodology is effective dealing with fine-sorted themes from the result that political positions towards different topics vary even within the same politicians. Through verification using American and Spanish political datasets, we find that the positioning of American and Spanish politicians on our defined liberal-conservative axis aligns with social common sense, political news, and previous research. Our architecture improves the standard word-level methodology and can be considered as a useful architecture for sentence-level applications in the future. - The flow of corporate control in the global ownership network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
PLOS ONE, 18, 8, e0290229, e0290229, Public Library of Science (PLoS), 24 Aug. 2023, [Peer-reviewed]
English, Scientific journal, We propose a model and algorithm to measure the amount of influence a shareholder has over the flow of corporate control held by the ultimate owners. Existing models of corporate ownership and control either focus on the ultimate owners’ influence or inadequately evaluate the influence possessed by intermediate shareholders in a ownership network. As it extends Network Power Index (NPI) that describes the the power of corporate control possessed by the ultimate owners, our new model, Network Power Flow (NPF), delineates the distribution of ownership influence among shareholders across the network and identifies the channels through which the ultimate owners’ corporate control travel through the global shareholding network. Our analysis of NPI and NPF values for 7 million ultimate owners and 16 million shareholders reveals a new landscape of ownership and control in the global shareholding network that remained opaque before. - Women, Peace and Security: Literature Review of Women and Intrastate Conflict
Jumpei Ono; Shohei Doi
Annals, Public Policy Studies, 17, 79, 100, Mar. 2023, [Corresponding author]
Japanese, Research institution - Difficulty and Possibility of Global Governance for SDGs through ESG investing: Big Data Analysis of Ownership Network
Takahiro TSUCHIYA; Shohei DOI; Takayuki MIZUNO; Shuhei KURISAKI
The Faculty of Economics and Business Administration Journal,Kyoto University of Advanced Science, 5, 1, 17, Mar. 2023
Japanese, Research institution - South Korea-Japan FCR Crisis and Public Opinion: Gathering Survey Data in Real Time Crisis Development
Shohei Doi; Kazunori Inamasu; Shoko Kohama; Atsushi Tago
Japanese Public Sentiment on South Korea: Popular Opinion and International Relations, Dec. 2021, [Lead author]
English, In book - Text Analysis of International Immigration Institution: Speech by Nordic Countries in UNHCR
Yumi Nakayama; Shohei Doi
Methods of International Relations Research: Principles and Practices, 213, 236, 10 Sep. 2021
Japanese, In book - Socially responsible investing through the equity funds in the global ownership network
Takayuki Mizuno; Shohei Doi; Takahiro Tsuchiya; Shuhei Kurizaki
PLOS ONE, 16, 8, e0256160, e0256160, Public Library of Science (PLoS), 12 Aug. 2021, [Peer-reviewed]
English, Scientific journal, We analyze the connectivity of equity investments to the firms in the global ownership network that are reported as non-compliant with Environment, Social, and Government (ESG) benchmarks. We find that a large number of shareholders have ownership linkages to non-ESG firms, most commonly with three or four degrees of separation. Analyzing the betweenness centrality for shareholders connecting the ultimate owners and non-ESG firms, we find that the investment management companies play important roles in channeling the investment money into non-ESG firms, where largest American asset managers commonly have one to two degrees of separation on their ownership linkages to those problematic firms. Since asset managers collect capital from investors by running the equity funds, we analyze the ownership stakes and the associated voting rights attributable to the equity funds investors. We estimate the distribution of the power of corporate control over non-ESG firms among specific asset managers (such as BlackRock and Fidelity) and among different types of the equity funds (such as mutual funds and exchanged-traded funds), and explores how investing in the equity funds rather than ownership investing may have shifted the distribution of the power to control those non-ESG firms. - The power of corporate control in the global ownership network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
PLOS ONE, 15, 8, e0237862, e0237862, Public Library of Science (PLoS), 27 Aug. 2020, [Peer-reviewed]
English, Scientific journal - Estimation of socioeconomic attributes from location information
Shohei Doi; Takayuki Mizuno; Naoya Fujiwara
Journal of Computational Social Science, 4, 1, 187, 205, Springer Science and Business Media LLC, 04 Jun. 2020, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal,Abstract Timely estimation of the distribution of socioeconomic attributes and their movement is crucial for academic as well as administrative and marketing purposes. In this study, assuming personal attributes affect human behavior and movement, we predict these attributes from location information. First, we predict the socioeconomic characteristics of individuals by supervised learning methods, i.e., logistic Lasso regression, Gaussian Naive Bayes, random forest, XGBoost, LightGBM, and support vector machine, using survey data we collected of personal attributes and frequency of visits to specific facilities, to test our conjecture. We find that gender, a crucial attribute, is as highly predictable from locations as from other sources such as social networking services, as done by existing studies. Second, we apply the model trained with the survey data to actual GPS log data to check the performance of our approach in a real-world setting. Though our approach does not perform as well as for the survey data, the results suggest that we can infer gender from a GPS log. - Network Shapley-Shubik Power Index: Measuring Indirect Influence in Shareholding Networks
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Complex Networks and Their Applications VIII, 611, 619, 25 Nov. 2019
English, International conference proceedings - Analyzing International Developmental Loan Markets with Rival Lenders
Suzuki, Motoshi; Iida, Keisuke; Doi, Shohei
Games of Conflict and Cooperation in Asia, 227, 248, 2017
English, In book
- 経済ネットワークの安全を保障する人工知能F.R.I.D.A.Y. をつくれ
水野 貴之; 土井 翔平; 栗崎 周平, 人工知能, 38, 2, 101, 108, 01 Mar. 2023
一般社団法人 人工知能学会, Japanese - 株所有ネットワークを通じた投資運用会社による企業コントロール
水野, 貴之; 土井, 翔平; 栗崎, 周平, 第84回全国大会講演論文集, 2022, 1, 189, 190, 17 Feb. 2022
多数決は勝者が総取りとなる非線形過程である。この非線形過程が、親会社の議決、子会社の議決、孫会社の議決と多層構造になっているのが株所有ネットワークである。これまでに、我々は、このネットワークにおける各最終株主の影響力を指数化する手法NPI（Network Power Index）を開発した。しかし、NPIは、運用会社など多数の最終株主の声を代弁する中間株主の影響力を指数化することができなかった。本発表では、最終株主から末端企業までの影響力の流れを測定する手法NPF（Network Power Flow）を提案し、各中間株主の影響力を示す。, Japanese - Visualizing National Economic Security Risk through Network Power Flow: Transparency in supply chain and ownership
MIZUNO Takayuki; DOI Shouhei; KURIZAKI Shuhei, Proceedings of the Annual Conference of JSAI, JSAI2022, 1H1GS1103, 1H1GS1103, 2022
Global supply chains and global ownership networks are complex structures. Raw materials are transformed into finished products through many companies in various countries and industries. Therefore, on these pathways it is not easy to manually find companies that are complicit in human rights violations, environmental destruction, or have geopolitical risks. In this study, we estimate the battery procurement pathway of Tesla, Inc. as a case study and identify the national economic security risks latent in the estimated procurement pathway as (1) traditional geopolitical risk, (2) networked geopolitical risk, and (3) hidden dominance geopolitical risks, which are classified into three categories. Each risk can be automatically identified from network analysis (Betweenness centrality, Network power index, and Network power flow) on publicly available inter-firm transaction and shareholder information., The Japanese Society for Artificial Intelligence, Japanese - The Connection between Investors and Anti-ESG Firms in Global Ownership Network: Dilemma in Socially Responsible Investing
MIZUNO Takayuki; DOI Shouhei; TSUCHIYA Takahiro; KURIZAKI Shuhei, Proceedings of the Annual Conference of JSAI, JSAI2021, 4H2GS11c05, 4H2GS11c05, 2021
We connect the corporate ownership network to the network of financial instruments that inject money into the ownership network. Almost all the asset managers have at least one path through which their equity stakes eventually reach a munitions company with the second or further apart links in the global ownership network. This result suggests that two obstacles encourage decoupling of equity stakes and social responsibilities so that socially responsible investors become incapable of making positive impacts with their investing strategy. The first obstacle is the fact that ETFs and other similar financial instruments separate capital and corporate control. The second obstacle is the complexity of ownership network itself. While the investors may have the potential to control munition companies, the complexity of the ownership network is likely to prevent the investors from knowing its own potential., The Japanese Society for Artificial Intelligence, Japanese - グローバルな株式ネットワークにおける中国による間接的な企業支配の可視化
土井, 翔平; 水野, 貴之; 栗崎, 周平, 第82回全国大会講演論文集, 2020, 1, 139, 140, 20 Feb. 2020
グローバル化に伴い国境を越えて複雑化する株式ネットワークにおいて、株主は子会社を通じて間接的に支配することができる。本研究ではそうした間接的支配を定量化することで、中国による世界経済に対する影響力を可視化する。支配される企業の売上ベースで計算した場合、中国政府は世界全体の1.4%程度を支配し、単一の株主としては世界最大の影響力を持っていることを明らかにした。また、産業セクター別に見た場合、中国はインフラ企業への支配力が高く、インフラ投資を謳う一帯一路構想を裏付ける結果である。加えて、国別に見ることで、先進国においても中国の影響力が拡大していることを示した。, Japanese - Diffusion Effects of Hong Kong Situation in Ownership Networks
DOI Shohei; MIZUNO Takayuki; KURIZAKI Shuhei, Proceedings of the Annual Conference of JSAI, JSAI2020, 2E5OS1b03, 2E5OS1b03, 2020
Corporates may be under the control of foreign governments or shareholders through global ownership chains. For instance, the government of China arguably exerts indirect influence over foreign power companies and port authorities via Chinese state-owned companies. In the previous conference, we presented the concept and algorithm of the Network power index (NPI) to quantify the indirect influence. In this presentation, we focus on how the change in ownership structure affects NPIs. In particular, we investigate hypothetical scenarios in which China has full control over companies in Hong Kong and Hong Kong completely blocks China's direct control. Because NPI is derived from the distribution of vote shares, political disputes between China and Hong Kong might diffuse impacts among third-party countries. From our simulations, we find which countries gain and lose their influence for each scenario. Interestingly, Japan loses its NPI, whether Hong Kong becomes independent or under the control of China., The Japanese Society for Artificial Intelligence, Japanese - Computational Social Science and Economic Security
Mizuno Takayuki; Doi Shohei, Proceedings of the Conference of Transdisciplinary Federation of Science and Technology, 2020, A-4-3, 2020
Most interdisciplinary research has been limited to the fusion of two fields, such as physics and economics, statistics and political science, and etc. In contrast, fusion in the computational social science involves multiple fields. The social system has become more and more complex with globalization, and social issues can only be solved by tackling them in multiple fields. Using the example of economic security in an increasingly complex global shareholding network, we will show that it is difficult to solve social issues without the fusion of economics, political science, and information science. Furthermore, this paper shows the history of the fusion of political science, economics, and information science, and we will discuss how computational social sciences have a significant place in economic security., Transdisciplinary Federation of Science and Technology, Japanese - How does the Japan and South Korea feud intensify, and is the U.S. able to help?
Shohei Doi; Atsushi Tago, PRIO Blogs, Aug. 2019, [Invited]
English, Others
- The Responsibility to Protect : Basic Documents and Commentaries, from the end of the Cold War to 2016
Masaki Nakauchi; Hiroshi Takahashi; Nagafumi Nakamura; Hirotsugu Ohba, Five documents
Osaka University Press, Nov. 2017, 9784872596069, 270, Japanese, Scholarly book, [Joint translation]
- Where are Women in Diplomacy? Gender Balance of Senior Staffs in MOFA of Japan
Shohei Doi; Jumpei Ono; Tomohiro Yamaguchi; Shoko Kohama
Japan Political Science Association, 11 Oct. 2025, Japanese, Poster presentation - Re-Examination of Discourse Analysis in Securitization Studies
Kohei Imai; Shohei Doi
International Political Science Association, 13 Jul. 2025, English, Oral presentation - Where are Women in Diplomacy? Gender Balance of Senior Staffs in MOFA of Japan
Shohei Doi; Jumpei Ono; Tomohiro Yamaguchi; Shoko Kohama
Workshop on International Policical Economy, 18 Mar. 2025, Japanese, Oral presentation - Mostly Harmless Attack: Signaling of Deterrence and Assurance
Shohei Doi
Japan Political Science Association, 05 Oct. 2024, Japanese, Oral presentation - Detecting similarity in political positions of politicians in categorized multilingual tweets
Jinghui Chen; Takayuki Mizuno; Shohei Doi
Society for Computational Social Science of Japan, 20 Feb. 2024, Japanese, Oral presentation - The Flow of Corporate Control in the Global Ownership Network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Complex Networks, 30 Nov. 2023, English, Poster presentation - Topic-specific transnational political ideology detection on Twitter
Jinghui Chen; Takayuki Mizuno; Shohei Doi
Japanese Society for Artificial Intelligence, 07 Jun. 2023, Japanese, Oral presentation - Twitter-based political Ideology Similarity detection across countries
陳 景慧; 水野 貴之; 土井 翔平
情報処理学会, 04 Mar. 2023, Japanese, Oral presentation - 隠れ株主の数理モデル化と様々な経済安全保障問題の見える化
水野 貴之; 土井 翔平; 栗崎 周平
情報処理学会, 03 Mar. 2023, Japanese, Oral presentation - Political Consequences of Economic Globalization: Intersection between Politics (Law) and Data Science
Shohei Doi
Hokkaido University Law Society, 22 Dec. 2022, Japanese, Invited oral presentation
[Invited] - Endogenous Commercial Peace Theory
Shohei Doi
Japan Public Choice Society, 03 Dec. 2022, Japanese, Oral presentation - The Flow of Corporate Control in the Global Ownership Network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Complex Networks, 10 Nov. 2022, English, Oral presentation - Echo Chambers and American and Chinese Public Diplomacy
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki; Masashi Toyoda
International Conference on Social Informatics, 19 Oct. 2022, English, Oral presentation - New Possibility and Limitation of ESG Investment: Analysis of Global Ownership Network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Japanese Political Science Association, 01 Oct. 2022, Japanese, Oral presentation - Contribution of intermediate shareholders to indirect corporate control in global ownership networks
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Conference on Complex Systems, Oct. 2022, English, Poster presentation - Visualizing National Economic Security Risk through Network Power Flow: Transparency in supply chain and ownership
Takayuki Mizuno; Shouhei Doi; Shuhei Kurizaki
Japanese Society for Artificial Intelligence, 14 Jun. 2022, Japanese, Oral presentation - Corporate Control by Investment Companies through Ownership Network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Information Processing Society of Japan, 04 Mar. 2022, Japanese, Oral presentation - Flow of corporate control power in the global ownership network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Meeting of Interdisciplinary Research on Economy and Scociety, 24 Dec. 2021, Japanese, Oral presentation - Uncovering the Structure of Influence in Global Ownership Network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Complex Networks, 30 Nov. 2021, English, Poster presentation - Flow of corporate control power in the global ownership network
Takayuki Mizuno; Shohei Doi; Takahiro Tsuchiya; Shuhei Kurizaki
Conference on Complex Systems, 25 Oct. 2021, English, Oral presentation - Echo Chambers and American and Chinese Public Diplomacy during the COVID-19 Era
Shuhei Kurizaki; Shohei Doi; Takayuki MIzuno
American Political Science Association, 03 Oct. 2021, English, Oral presentation - Echo Chambers and American and Chinese Public Diplomacy during the COVID-19 Era
Takayuki Mizuno; Shuhei Kurizaki; Shohei Doi; Masashi Toyoda
International Conference on Computational Social Science, 30 Jul. 2021, English, Oral presentation - Links between ESG Investment and Vice Firms in Global Ownership Network
Takayuki Mizuno; Shohei Doi; Hirotaka Tsuchiya; Shuhei Kurizaki
Japan Society for Artificial Intelligence, 11 Jun. 2021, Japanese, Oral presentation - Connection between Investors and Vice Firms in Global Ownership Network
Takayuki Mizuno; Shohei Doi; Takahiro Tsuchiya; Shuhei Kurizaki
Computational Social Science Japan, 27 Feb. 2021, Japanese, Oral presentation - Us-China Polarization and Echo Chamber in SNS: Does COVID-19 Decouple the US and China?
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki; Masahi Toyoda
Data-driven Mathematical Sciences, 21 Dec. 2020, Japanese, Oral presentation - Socially Responsible Investing in the Global Ownership Network and its implications for International Security
Takayuki Mizuno; Shohei Doi; Takahiro Tsuchiya; Shuhei Kurizaki
Conference on Complex Systems, 08 Dec. 2020, English, Oral presentation - Socially Responsible Investing in the Global Ownership Network and its implications for International Security
Takayuki Mizuno; Shohei Doi; Takahiro Tsuchiya; Shuhei Kurizaki
Complex Networks, 03 Dec. 2020, English, Oral presentation - Dilemma in ESG Investment as a New Security Issue: Analysis of Global Ownership Network
Shohei Doi; Shuhei Kurizaki; Takahiro Tsuchiya; Takayuki Mizuno
Japan Association of International Relations, 23 Oct. 2020, Japanese, Oral presentation - Computational Social Science and Economic Security
Takayuki Mizuno; Shohei Doi
Transdisciplinary Federation of Science and Technology, 09 Oct. 2020, Japanese, Oral presentation - Political Dispute under Economic Interdependence
Shohei Doi
Graduate Students and Young Fellows Workshop of Japan Assiciation of International Relations, 23 Aug. 2020, Japanese, Oral presentation - How does China’s Corporate Control on Hong Kong Affect Third-party Countries?
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
International Conference on Computational Social Science, 18 Jul. 2020, English, Poster presentation - Diffusion Effects of Hong Kong Situation in Ownership Networks
Shohei Doi; Takayuki Mizuno; Shuhei Kurizaki
Japan Society for Artificial Intelligence, 10 Jun. 2020, Japanese, Oral presentation - Visualizing Indirect Corporate Control by China in Global Ownership Networks
Shohei Doi; Takayuki Mizuno; Shuhei Kurizaki
Information Processing Society of Japan, 05 Mar. 2020, Japanese, Oral presentation
[Domestic Conference] - Estimation of Socioeconomic Attributes from Location Information
Shohei Doi; Takayuki Mizuno; Naoya Fujiwara
Computational Social Science Workshop, 28 Feb. 2020, Japanese, Oral presentation - Visualizing Indirect Influence of China in Global Shareholding Networks
水野貴之; 土井翔平; 栗崎周平
NetSci-X, 20 Jan. 2020, English, Oral presentation
[International presentation] - Shifting Hegemony? Corporate Control in Global Ownership Networks
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Causal Inference and Data Science Seminars, 16 Dec. 2019, English, Invited oral presentation
[Domestic Conference] - Network Shapley-Shubik Power Index: Measuring Indirect Influence in Shareholding Networks
水野貴之; 土井翔平; 栗崎周平
Complex Networks, 01 Dec. 2019, English, Poster presentation
[International presentation] - The Shapley-Shubik Power Index in Complex Network
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Social Informatics, 20 Nov. 2019, English, Poster presentation
[International presentation] - Estimating Socioeconomic Attributes from Location Information
Shohei Doi; Takayuki Mizuno; Naoya Fujiwara
Meeting of Interdisciplinary Research on Economy and Scociety, 08 Nov. 2019, English, Oral presentation
[Domestic Conference] - Visualization of Hidden Competitiveness in Global Shareholding Networks
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Conference on Complex Systems, 01 Oct. 2019, English, Oral presentation
[International presentation] - Estimating Human Attributes from Location
Shohei Doi; Takayuki Mizuno
Data-driven Mathematical Sciences, 15 Sep. 2019, Japanese, Oral presentation
[Domestic Conference] - Power of China in Shareholding Networks
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Data-driven Mathematical Sciences, 15 Sep. 2019, Japanese, Oral presentation
[Domestic Conference] - Network Power Index and Its Applications
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Physical Scociety of Japan, 10 Sep. 2019, Japanese, Oral presentation
[Domestic Conference] - Visualizing hidden economic influence of government on foreign countries through complex shareholding relasionships: Application of network power index
Takayuki Mizuno; Shohei Doi; Shuhei Kurizaki
Summer Workshop on Economic Theory, 03 Aug. 2019, Japanese, Oral presentation
[Domestic Conference] - Visualization of China’s Indirect Influence on Global Shareholders Networks
Takayuki Mizuno; Mitsuhiro Odaka; Shohei Doi; Shuhei Kurizaki
The Japanese Society for Artificial Intelligence, 05 Jun. 2019, Japanese, Oral presentation
[Domestic Conference] - How Peers Matter in Climate Policy Implementation? Analyzing Multi-directional and Multi–dimensional Policy Diffusion
Azusa Uji; Motoshi Suzuki; Shohei Doi
International Studies Association, 29 Mar. 2019, English, Oral presentation
[International presentation] - Security-Economy Trade-off in Foreign Economic Policy: Discussion in Japanese Parliament
Shohei Doi
Waseda-Essex Scientific PoliSci/IR Collaboration and Exchange, 07 Mar. 2019, English, Oral presentation
[International presentation] - Political Rivalry and Economic Interdependence in East Asia: Comparative Case Study
Shohei Doi
Political Science Workshop, 18 Oct. 2018, Japanese, Oral presentation
[Domestic Conference] - A Critical Examination of the Commercial Peace Theory
Shohei Doi
Waseda-Essex Scientific PoliSci/IR Collaboration and Exchange, 21 Sep. 2018, English, Oral presentation
[International presentation] - Endogenous Theory of Commercial Peace
Shohei Doi
Center for Far Eastern Studies, University of Toyama, 13 Jul. 2018, Japanese, Oral presentation
[Domestic Conference] - Climate Policy-making and Peer Pressure in the Regime Complex
Azusa Uji; Shohei Doi; Motoshi Suzuki
Fourth Annual Conference on Environmental Politics & Governance, 29 Jun. 2018, English, Oral presentation
[International presentation] - Climate Policy-making and Peer Pressure in the Regime Complex
Azusa Uji; Shohei Doi; Motoshi Suzuki
International Political Economy Workshop, 08 Mar. 2018, Japanese, Oral presentation
[Domestic Conference] - Economic Cost or Rally Effect?
Shohei Doi
Kobe University Political Science Workshop, 30 Jan. 2018, Japanese, Oral presentation
[Domestic Conference] - On Finite Mixture Model: A Review of Imai and Tingley (2012)
Shohei Doi
Social Science Methodology Workshop, 26 Oct. 2017, Japanese, Oral presentation
[Domestic Conference] - Economy and Security in East Asia
Shohei Doi
Political Science Workshop, 05 Oct. 2017, Japanese, Oral presentation
[Domestic Conference] - Endogenous Theory of Interdependence and Peace
Shohei Doi
Colloquium for Young Scholars in Conflict Studies, 28 Jul. 2017, English, Oral presentation
[International presentation] - Decomposing Political Incentives in International Crisis: Experimental Approach
Shohei Doi
Political Science Workshop, 01 Dec. 2016, Japanese, Oral presentation
[Domestic Conference] - Commercial Peace and Endogenous Interdependence
Shohei Doi
Japan Association of International Relations, 14 Oct. 2016, Japanese, Oral presentation
[Domestic Conference] - Commercial Peace and Endogenous Interdependence
Shohei Doi
International Political Economy Workshop, 23 Sep. 2016, Japanese, Oral presentation
[Domestic Conference] - Analyzing International Development Loan Markets with Rival Lenders
Motoshi Suzuki; Keisuke Iida; Shohei Doi
International Studies Association, 18 Mar. 2016, Oral presentation
[International presentation] - Analyzing International Development Loan Markets with Rival Lenders
Motoshi Suzuki; Keisuke Iida; Shohei Doi
International Political Economy Workshop, 04 Mar. 2016 - Analyzing International Development Loan Markets with Rival Lenders
Motoshi Suzuki; Shohei Doi
Global Economy and World Order, 30 Jan. 2016, Oral presentation
[International presentation] - Competition and Coordination among Multiple Lenders
Shohei Doi
International Political Economy Workshop, 25 Sep. 2015, Japanese, Oral presentation
[Domestic Conference] - Interdependence and the Shadow of Conflict
Shohei Doi
Sakura Meeting (The 5th International Conferences for Collaborative Research), 09 Apr. 2015, English, Poster presentation
[International presentation] - A Dynamic Model of Economic Interdependence and Crisis
Shohei Doi
Game Theory Workshop, 07 Mar. 2015, Japanese, Oral presentation
[Domestic Conference] - Signaling in Deterrence by Alliance
Shohei Doi
International Political Economy Workshop, 24 Sep. 2013, Japanese, Oral presentation
[Domestic Conference]
- 外交安全保障論, 2024年, 修士課程, 法学研究科
- 政治学特殊演習, 2024年, 修士課程, 法学研究科
- 政治学特別研究, 2024年, 博士後期課程, 法学研究科
- 演習Ⅰ, 2024年, 学士課程, 法学部
- 人文・社会科学の基礎, 2024年, 学士課程, 全学教育
- グローバル・ガバナンス論, 2024年, 専門職大学院, 公共政策学教育部
- 国際公共政策学, 2024年, 専門職大学院, 公共政策学教育部
- 技術政策学, 2024年, 専門職大学院, 公共政策学教育部
- 文理融合政策事例研究, 2024年, 専門職大学院, 公共政策学教育部
- 国際公共政策学, 2024年, 法科大学院, 法学研究科
- Japanese Association of International Relations
- Japanese Society for Artificial Intelligence
- Information Processing Society of Japan
- JAPAN ASSOCIATION FOR INTERNATIONAL SECURITY
- 自然災害と国家間紛争：国際的救援活動の実現とその効果に関する包括的検討
科学研究費助成事業
Apr. 2025 - Mar. 2029
小浜 祥子; 千葉 大奈; 土井 翔平; 西 平等; 前田 亮介; 三船 恒裕
日本学術振興会, 基盤研究(B), 北海道大学, 25K00606 - データ科学で解明する新しい国際政治経済秩序
科学研究費助成事業
01 Apr. 2023 - 31 Mar. 2028
栗崎 周平; 水野 貴之; 土井 翔平
日本学術振興会, 基盤研究(A), 早稲田大学, 23H00042 - ポピュリスト分析のための「安全保障化」の再検討：定性的・定量的手法の融合
科学研究費助成事業
Apr. 2022 - Mar. 2026
今井 宏平; 川久保 文紀; 塚田 鉄也; 西海 洋志; 上野 友也; 土井 翔平; 濱中 新吾; 上谷 直克
本研究課題は、国民のアイデンティティに訴えかけることで「敵」を創り出し、脅威認識を煽り、支持を獲得するポピュリストの安全保障化という政治手法を、国際関係論においてコペンハーゲン学派が1990年代に提唱した定性的手法が中心の分析枠組みに、定量的手法と比較政治学の知見を導入してアップグレードを図った新たな枠組みを用いて解明することを目的とする。
１年目の2022年度は、まだCOVID-19の影響が残っており、依然として海外出張がやや難しい状況であったため、主に図書購入による基礎知識の蓄積、安全保障化に関連する主要文献の翻訳の計画および実施に重点を置いて研究活動を行なった。また、何度か会合を実施したが全てオンライン会合であった。
日本学術振興会, 基盤研究(B), 独立行政法人日本貿易振興機構アジア経済研究所, 23K22096 - Re-examination of "securitization" for the analysis of populism: Combining qualitative and quantitative methods
Grants-in-Aid for Scientific Research
Apr. 2022 - Mar. 2026
今井 宏平; 川久保 文紀; 塚田 鉄也; 西海 洋志; 上野 友也; 土井 翔平; 濱中 新吾; 上谷 直克
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Institute of Developing Economies, Japan External Trade Organization, 22H00824 - Political Consequences of Financial Globalization: A Network Perspective
Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
Apr. 2021 - Mar. 2026
土井 翔平
本研究は発生していることは分かっているが、その実態は依然として茫漠としているグローバル化という現象を分析することを目的としている。特に、国境を越えて、個人や企業、国家が複雑なネットワークを形成している金融ネットワークを解析することで、どのような経済的相互依存が起こっているのか、どのような政治的インパクトが起こり得るのかに答える。その際に、近年、利用可能となった金融ビッグデータを利活用することで、これまで明らかにされてこなかった微視的レベルの分析を実行する。
本年度は、研究の初期段階として、株式保有ネットワークの分析手法の開発と予備分析を行った。既に、最終株主の間接的影響力を評価する手法としてNetwork Power Indexを提案していたが、それを発展させる形で中間株主の寄与度を測るNetwork Power Flowを開発した。これにより、国家や金融機関といった巨大株主が、どのような中間株主を介してその影響力を有しているのかを明らかにすることができる。その結果、国家や一部の金融機関が大きな影響力を有しているが、国家が国有企業を有している場合と投資運用をしている場合を区別することができた。また、最終株主ではないが、様々な投資家から資金を集めて運用している機関投資家の存在も検出できた。
さらに、直接的な株保有だけでなく、ETFなどの投資信託といった間接的な株保有も台頭している現実を反映させるために、金融商品のデータと株式保有データを接合することで、金融商品を購入することでどのような企業に資金が流入しているのかも明らかにした。
Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, Hokkaido University, Principal investigator, 21K13242 - Globalization and its Consequences on International Relations
Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
Apr. 2020 - Mar. 2023
Shohei Doi
本研究の目的はビッグデータを利活用してグローバル化の実態と政治的帰結を解明することである。今年度は、グローバル化の中でも金融ネットワークに着目した。世界中の株主や企業を対象とする株式ネットワークに関するデータと投資信託やETFなどの金融商品に関するデータを分析対象とした。先行研究と同様、アメリカの大手投資銀行が金融ネットワークにおいて重要な位置を占めていることだけでなく、先行研究では看過されてきた政府もまた金融ネットワークに埋め込まれていることが分かった。
また、株式保有比率から影響力を測定するShapley-Shubik Power Indexをネットワークに拡張したNetwork Power Indexを昨年度提案しており、それをグローバルな金融ネットワークに応用した。その結果、「株主としての国家」を可視化することができ、中国政府が単独の株主としては最大の影響力を持っていることが判明した。これらの知見は査読論文として英語ジャーナルに掲載された。
加えて、金融ネットワークにおいて問題のある企業にどのように資金が流入しているかを分析した。問題のある企業としてはアメリカ商務省や日本の経済産業省が輸出規制対象としている中国企業と批判的に報道された企業 (Adverse Media Entity) である。分析の結果、ほとんどの企業は直接的にこれらの問題のある企業の株を保有していないが、孫会社やそれ以降を見ると問題企業と間接的に繋がっていることが分かった。この知見は国内学会で報告し、査読論文として英語ジャーナルに投稿中である。
Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Waseda University, Principal investigator, 20J00765 - Empirical Studies of Rally around the Flag Effects and Nationalist Behavior in Israel and Japan
Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
Oct. 2019 - Mar. 2023
濱中 新吾; 秦 正樹; 横山 智哉; 土井 翔平
2020年10月31日～11月3日と11月8日～12日の2回に分けて実験世論調査をイスラエル、日本、アメリカで実施した。3カ国で共通となるヴィネット実験のデザインは研究分担者の秦正樹が行い、日本調査とアメリカ調査で共通する政治リーダーのキュー(手がかり)に関する質問の設計は研究分担者の横山智哉が行った。またイスラエル世論調査の質問項目設計は研究代表者の濱中新吾と海外共同研究者のYuval Feinsteinで分担した。研究分担者の土井翔平はプライミングに関するいくつかの質問を手がけた。
実験世論調査はWebサーベイ用プラットフォームQualtricsを使用したので、それぞれの研究者が自宅または本務校の研究室に設置したコンピュータにより、研究代表者のアカウント上で作成を行った。質問票作成はおおよそ3週間を要したが、その間のE-mailならびにmessengerやZoomによる研究メンバー間の連絡は密に行われた。その結果、本研究計画の研究種目「国際共同研究加速」の名に値する協働を成すことができた。
実験世論調査は仮想的な紛争事件が勃発した事に対する各国リーダーの演説を受けて、リーダーを支持するか否かの態度を測定する質問を中心に据えた。この質問への回答が旗下集結効果として操作化される。この調査では戦時の旗下集結効果だけではなく、コロナ禍における各国政府の対応と、対応評価に基づくリーダー支持態度も測定している。
2回に分けて収集したデータは、各メンバーにより自らの問題関心の下、分析が進められている。研究代表者は次年度に行う予定の日本政治学会における研究報告に向けて、報告論文を準備している。この他、研究代表者は2本の学術論文の国際誌採択に成功し、1本は公表され、もう1本は次年度に公開される予定である。
Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Ryukoku University, 19KK0033 - Big Data Driven Conflict Studies : Visualization of Hidden Perpetrators
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Jul. 2015 - Mar. 2019
MIZUNO Takayuki; WATANABE tsutomu; HISANO ryohei; NAKAWATASE hidekazu; DOI shohei; ARAI yuta; ITO akito; ODAKA mitsuhiro; MINAMI reiko
After examining the structure of global inter-firm networks, we discuss the implications of global linkages at the firm level for the proliferation of ‘conflict minerals’ or dirty products through global buyer-supplier linkages. We show through community structure analysis that firms cross national borders and form communities in the same industry. There are also firms that act as bridges between these communities, so that throughout the world each firm is connected with an average of six business partners. By enhancing this feature of links between firms, it can be used as a countermeasure for risks related to conflict minerals and slave labor issues. By utilizing a simple diffusion model and empirical results for the community structure, we show numerically that regulations on the purchases conflict minerals by limited number of G8 firms belonging to some specific industries would substantially reduce their worldwide use.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), National Institute of Informatics, Others, 15KT0052 - Dynamic Analysis on the Functions and Limitations of Economic Interdependence in Security
Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
Apr. 2015 - Mar. 2018
土井 翔平
本年度は経済と安全保障に関するゲーム理論モデルから導出された仮説を統計分析により実証した。前年度より、経済的相互依存が中程度である国家間において最も武力紛争は生じやすいという仮説を統計分析により実証していたが、統計モデルを再検討することによりより頑健な結果が得られた。数理モデル及び統計モデルの成果はスタンフォード大学の教授を始め国内外の国際関係論者が集まった会議において報告し、意見交換を行った。
また、ゲーム理論のモデルより、国家は敵対国の国力伸長を助長するとしても経済的利益のために貿易を行うが、敵対国の脅威が大きくなるにつれて経済関係を縮小するという仮説も導出された。そこで、本年度は、敵対関係と経済関係が併存する東アジアにおいて事例研究によりこの仮説の妥当性を検討した。基本的に、国家は経済的利益と安全保障への悪影響を比較考慮しつつ敵対国との経済関係を管理していることが示された。一方で、民間アクターの重要性、敵対国との経済関係の拡大と縮小の間を振り子のように変動するといった、ゲーム理論では表現しきれなかった要素が働いていることも明らかになった。
最後に、武力紛争により経済関係が縮小するため、そのような経済的損失を忌避して武力行使に抑制的になるという有力な見解に対してサーベイ実験による検証を行った。そこで、日中間の尖閣諸島を巡る紛争に関する架空のシナリオを被験者に提示し、日本政府への支持態度を回答してもらい、それを分析することで、経済的損失に対してどのような反応を示すのかを明らかにした。日本人は経済的損失に対して否定的に反応するという意味で既存の見解に合致する一方、国際危機時に政権への支持率が上がるという旗下結集効果も存在し、後者が前者を相殺することで日中間の国際危機のエスカレーションが抑制されないという示唆を得た。
Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Kyoto University, 15J02777
- 情報処理装置、情報処理方法、および、情報処理プログラム
Patent right, 水野 貴之; 栗崎 周平; 土井 翔平, 大学共同利用機関法人情報・システム研究機構, 学校法人早稲田大学, 国立大学法人北海道大学
特願2025-006499, 17 Jan. 2025
特開2025-115955, 07 Aug. 2025 - 影響力評価システム
Patent right, 水野 貴之; 土井 翔平; 栗崎 周平, 大学共同利用機関法人情報・システム研究機構
特願2021-162219, 30 Sep. 2021
特開2023-51495, 01 Apr. 2023
特許7680026 - 情報処理装置、情報処理方法、および、情報処理プログラム
Patent right, 水野 貴之; 栗崎 周平; 土井 翔平
特願2024-9846, 26 Jan. 2024 - 影響力評価システム
Patent right, 水野 貴之; 土井 翔平, 大学共同利用機関法人情報・システム研究機構
特願2022-030948, 01 Mar. 2022
特開2022-071073, 13 May 2022
特許7315185
26 Jul. 2023, 大学共同利用機関法人情報・システム研究機構 - System of Evaluating Influence
Patent right, Mizuno takayuki; Shohei Doi, Research Organization of Information and Systems
特願2019-119796, 27 Jun. 2019
特開2021-005298, 14 Jan. 2021
特許7040786
23 Mar. 2022
202103018661218654
Social Contribution Activities
- A Lecture in Open House
19 Sep. 2021 - 20 Sep. 2021
Lecturer
Hokkaido University
Open House - Formal Political Analysis
13 Dec. 2018
Lecturer
Kyoto University, Rakunan High School - Formal Political Analysis
01 Nov. 2018
Lecturer
Kyoto University, St. Andrew's School - Political Data Analysis
14 Dec. 2017
Lecturer
Kyoto University, Shizuoka High School - Formal Political Analysis
30 Nov. 2017
Lecturer
Kyoto University, Waseda Saga High School - Political Data Analysis
17 Nov. 2017
Lecturer
Kyoto University, Yamate Gakuin High School - Peace and War
09 Nov. 2017
Lecturer
Kyoto University, Hakodate La Salle High School - Peace and War
07 Nov. 2017
Lecturer
Kyoto University、 Suma Gakuen High School
