Hiroki Sakaji

Profile Information

Affiliation: Associate Professor, Faculty of Information Science and Technology, Hokkaido University

Degree: Doctor of Engineering(Toyohashi University of Technology)

Researcher number: 70722809
ORCID ID: https://orcid.org/0000-0001-5030-625X
J-GLOBAL ID: 201501074215806080
researchmap Member ID: B000244200

External link: https://www.tetsuwaka.net

Research Interests

Research Areas

Informatics / Intelligent informatics / Natural Language Processing

Research History

Nov, 2023 - Present

Associate Professor, Faculty of Information Science and Technology, Hokkaido University
Apr, 2018 - Oct, 2023

Project Lecturer, Department of Systems Innovation, School of Engineering, The University of Tokyo, The University of Tokyo
Apr, 2017 - Mar, 2018

Assistant Professor, Department of Systems Innovation, School of Engineering, The University of Tokyo, The University of Tokyo
Sep, 2013 - Mar, 2017

Assistant Professor, Department of Computer and Information Science, Seikei University

Education

Apr, 2009 - Mar, 2012

Graduate School of Engineering, Toyohashi University of Technology
Apr, 2007 - Mar, 2009

Graduate School of Engineering, Toyohashi University of Technology
Apr, 2003 - Mar, 2007

Faculty of Engineering, Toyohashi University of Technology

Awards

Jul, 2023

Competitive Paper Award, Policy Gradient Stock GAN for Realistic Discrete Order Data Generation in Financial Markets, 14th IIAI International Congress on Advanced Applied Informatics

Masanori Hirano, Hiroki Sakaji, Kiyoshi Izumi
Jul, 2022

Outstanding Paper Award, Investment Strategy via Lead Lag Effect using Economic Causal Chain and SSESTM Model, 10th International Congress on Advanced Applied Informatics

Kei Nakagawa, Shingo Sashida, Hiroki Sakaji
May, 2022

Best Paper Award, Graph Representation Learning of Banking TransactionNetwork with Edge Weight-Enhanced Attention and Textual Information, The 2nd Workshop on Financial Technology on the Web

Naoto Minakawa, Kiyoshi Izumi, Hiroki Sakaji, Hitomi Sano
2022

JSAI Incentive Award, Japanese Society for Artificial Intelligence
2020

JSAI Annual Conference Award, STBM+: Advanced Stochastic Trading Behavior Model for Financial Markets based on Residual Blocks or Transformers, Japanese Society for Artificial Intelligence

Masanori Hirano, Kiyoshi Izumi, Hiroki Sakaji
Aug, 2019

Best Paper Award, Economic Causal-Chain Search using Text Mining Technology, The First Workshop on Financial Technology and Natural Language Processing (FinNLP)

Kiyoshi Izumi, Hiroki Sakaji
2019

JSAI Incentive Award, Japanese Society for Artificial Intelligence
2019

JSAI Annual Conference Award, Japanese Society for Artificial Intelligence
Dec, 2017

企業賞「Sansan株式会社」, 動画サイトのコメントを用いたタグ推定に関する研究, IDRユーザフォーラム2017

坂地泰紀, 小林暁雄, 小花聖輝
Oct, 2014

優秀論文賞, 金融情報学研究会

坂地泰紀

Papers

115

Enhancing risk analysis with GNN: Edge classification in risk causality from securities reports

Hajime Sasaki, Motomasa Fujii, Hiroki Sakaji, Shigeru Masuyama

International Journal of Information Management Data Insights, 4(1) 100217-100217, Apr, 2024 Peer-reviewed
Metadata-based Clustering and Selection of Metadata Items for Similar Dataset Discovery and Data Combination Tasks

Takeshi Sakumoto, Teruaki Hayashi, Hiroki Sakaji, Hirofumi Nonaka

IEEE Access, 1-1, Mar 11, 2024 Peer-reviewed
Indexing and Visualization of Climate Change Narratives Using BERT and Causal Extraction.

Hiroki Sakaji, Noriyasu Kaneda

2023 IEEE International Conference on Big Data (BigData), 5674-5683, Dec 15, 2023 Peer-reviewedLead authorCorresponding author
From Base to Conversational: Japanese Instruction Dataset and Tuning Large Language Models

Masahiro Suzuki, Masanori Hirano, Hiroki Sakaji

2023 IEEE International Conference on Big Data (BigData), Dec 15, 2023 Peer-reviewed
Discovering new applications: Cross-domain exploration of patent documents using causal extraction and similarity analysis

Meiyun Wang, Hiroki Sakaji, Hiroaki Higashitani, Mitsuhiro Iwadare, Kiyoshi Izumi

World Patent Information, 75, Dec, 2023 Peer-reviewed
Financial Causality Extraction Based on Universal Dependencies and Clue Expressions.

Hiroki Sakaji, Kiyoshi Izumi

New Generation Computing, 41(4) 839-857, Nov, 2023 Peer-reviewedLead authorCorresponding author
Constructing Sentiment Signal-Based Asset Allocation Method with Causality Information

Rei Taguchi, Hiroki Sakaji, Kiyoshi Izumi, Yuri Murayama

New Generation Computing, Sep 11, 2023 Peer-reviewed
llm-japanese-dataset v0: Construction of Japanese Chat Dataset for Large Language Models and Its Methodology

Masanori Hirano, Masahiro Suzuki, Hiroki Sakaji

Advances in Networked-based Information Systems, 442-454, Aug 24, 2023 Peer-reviewed
Constructing and analyzing domain-specific language model for financial text mining

Masahiro Suzuki, Hiroki Sakaji, Masanori Hirano, Kiyoshi Izumi

Information Processing & Management, 60(2) 103194-103194, Mar, 2023 Peer-reviewed
Gradual Further Pre-training Architecture for Economics/Finance Domain Adaptation of Language Model

Hiroki Sakaji, Masahiro Suzuki, Kiyoshi Izumi, Hiroyuki Mitsugi

2022 IEEE International Conference on Big Data (Big Data), Dec 17, 2022 Peer-reviewedLead authorCorresponding author
A Model of Pricing Data and Their Constituent Variables Traded in Two-Sided Markets with Resale: A Subject Experiment

Toshihiko Nanba, Kazuhito Ogawa, Naoki Watanabe, Teruaki Hayashi, Hiroki Sakaji

2022 IEEE International Conference on Big Data (Big Data), Dec 17, 2022 Peer-reviewed
Extraction and classification of risk-related sentences from securities reports

Motomasa Fujii, Hiroki Sakaji, Shigeru Masuyama, Hajime Sasaki

International Journal of Information Management Data Insights, 2(2) 100096-100096, Nov, 2022 Peer-reviewed
Models of Exchanged Datasets and Interactions of Buyers in the Data Market: Toward Multi-Agent Simulators for System Design

Teruaki Hayashi, Hiroyasu Matsushima, Hiroki Sakaji, Yoshiaki Fukami, Takumi Shimizu

Procedia Computer Science, 207 1695-1704, Sep, 2022 Peer-reviewed
Investment Strategy via Lead Lag Effect using Economic Causal Chain and SSESTM Model

Kei Nakagawa, Shingo Sashida, Hiroki Sakaji

10th International Congress on Advanced Applied Informatics (SCAI2022), 287-292, Jul, 2022 Peer-reviewed
Forecasting Stock Price Trends by Analyzing Economic Reports With Analyst Profiles

Masahiro Suzuki, Hiroki Sakaji, Kiyoshi Izumi, Yasushi Ishikawa

Frontiers in Artificial Intelligence, 5, Jun 7, 2022 Peer-reviewed
Attempt to Develop An Approach Based on BERT for Task of NTCIR-16 QA Lab-Poliinfo-3 Budget Argument Mining

Akio Kobayashi, Hiroki Sakaji

the 16th NTCIR Conference on Evaluation of Information Access Technologies, 199-200, Jun, 2022 Peer-reviewed
Constructing Equity Investment Strategies Using Analyst Reports and Regime Switching Models

Rei Taguchi, Hikaru Watanabe, Hiroki Sakaji, Kiyoshi Izumi, Kenji Hiramatsu

Frontiers in Artificial Intelligence, 5, May 18, 2022 Peer-reviewed
Concept and Practice of Artificial Market Data Mining Platform

Masanori Hirano, Hiroki Sakaji, Kiyoshi Izumi

2022 IEEE Symposium on Computational Intelligence for Financial Engineering and Economics (CIFEr), May, 2022 Peer-reviewed
Implementation of Actual Data for Artificial Market Simulation

Masanori Hirano, Kiyoshi Izumi, Hiroki Sakaji

The 21st International Conference on Autonomous Agents and Multiagent Systems (AAMAS 2022), May, 2022 Peer-reviewed
Graph Representation Learning of Banking TransactionNetwork with Edge Weight-Enhanced Attention and Textual Information

Naoto Minakawa, Kiyoshi Izumi, Hiroki Sakaji, Hitomi Sano

The 2nd Workshop on Financial Technology on the Web (FinWeb), May, 2022 Peer-reviewed

Misc.

120

Extraction SDGs-related sentences from Sustainability Reports using BERT and ChatGPT

SASHIDA Masaki

JSAI Technical Report, Type 2 SIG, 2023(FIN-031) 55-60, Oct 10, 2023
Automotive Supply Chains Turbulence Index with Foot Traffic Data

UEDA Tsubasa, IZUMI Kiyoshi, SAKAJI Hiroki

JSAI Technical Report, Type 2 SIG, 2023(FIN-030) 40-44, Mar 4, 2023
Proposal for Turning Point Detection Method Using Financial Text and Transformer

Rei Taguchi, Hikaru Watanabe, Hiroki Sakaji, Kiyoshi Izumi, Kenji Hiramatsu

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 13859 LNAI 171-181, 2023
New Intellectual Property Management Method Aiming at Expanding Technology Applications and Secondary Development

WANG Meiyun, SAKAJI Hiroki, HIGASHITANI Hiroaki, IWADARE Mitsuhiro, IZUMI Kiyoshi

Proceedings of the Annual Conference of JSAI, JSAI2023 2N1GS1004-2N1GS1004, 2023
Proposing task to extract differences from time series financial documents

SUZUKI Masahiro, SAKAJI Hiroki, IZUMI Kiyoshi

Proceedings of the Annual Conference of JSAI, JSAI2023 1E3GS602-1E3GS602, 2023
Proposed asset allocation based on sentiment signals considering causal relationships

TAGUCHI Rei, SAKAJI Hiroki, IZUMI Kiyoshi

Proceedings of the Annual Conference of JSAI, JSAI2023 2T1GS1001-2T1GS1001, 2023
Financial Causality Extraction using Graph Neural Networks

SAKAJI Hiroki, IZUMI Kiyoshi

Proceedings of the Annual Conference of JSAI, JSAI2023 3A5GS601-3A5GS601, 2023
Prediction of China Market Index Using Bilingual Sentiment Analysis

CONG Liu, SAKAJI Hiroki, IZUMI Kiyoshi, HAYAKAWA Tadaaki, TSUKAMOTO Kazuya, KATO Daisuke

JSAI Technical Report, Type 2 SIG, 2022(FIN-029) 28-31, Oct 8, 2022
Framework for Predicting Monetary Policy of Central Bank Based on Text Mining

SAKAJI Hiroki, KATO Daisuke, YOSHIDA Yusuke, WATANABE Tsuyoshi, HAYAKAWA Tadaaki, IZUMI Kiyoshi

JSAI Technical Report, Type 2 SIG, 2022(FIN-028) 113, Mar 12, 2022
Analysis of the Relationship between Rainfall Observation Data and ATM Statistics Data using Location Information

SANO Hitomi, MINAKAWA Naoto, SAKAJI Hiroki, IZUMI Kiyoshi

JSAI Technical Report, Type 2 SIG, 2022(FIN-028) 105, Mar 12, 2022
Construction and Validation of a Pre-Training and Additional Pre-Training Financial Language Model

SUZUKI Masahiro, SAKAJI Hiroki, HIRANO Masanori, IZUMI Kiyoshi

JSAI Technical Report, Type 2 SIG, 2022(FIN-028) 132, Mar 12, 2022
Transaction Prediction using Textual Industry Information and Graph Neural Network

MINAKAWA Naoto, IZUMI Kiyoshi, SAKAJI Hiroki, SANO Hitomi

JSAI Technical Report, Type 2 SIG, 2022(FIN-028) 124, Mar 12, 2022
Policy Gradient Stock GAN for Realistic Discrete Order Data Generation in Financial Markets.

Masanori Hirano 0001, Hiroki Sakaji, Kiyoshi Izumi

CoRR, abs/2204.13338, 2022
Extraction of theme stocks using individual stock information and cross sectional stock information

TAKAYANAGI Takehiro Takehiro, SAKAJI Hiroki, IZUMI Kiyoshi

Proceedings of the Annual Conference of JSAI, JSAI2022 2A6GS601-2A6GS601, 2022
Analysis of Cash Withdrawal Trends in the Case of Localized Heavy Rain by Data Fusion using Location Information

SANO Hitomi, MINAKAWA Naoto, SAKAJI Hiroki, IZUMI Kiyoshi

Proceedings of the Annual Conference of JSAI, JSAI2022 4N1GS302-4N1GS302, 2022
Transaction prediction by using graph neural network and textual industry information

MINAKAWA Naoto, IZUMI Kiyoshi, SAKAJI Hiroki, SANO Hitomi

Proceedings of the Annual Conference of JSAI, JSAI2022 4S1IS2f01-4S1IS2f01, 2022
Construction and Validation of a Pre-Trained Language Model Using Financial Documents

SUZUKI Masahiro, SAKAJI Hiroki, HIRANO Masanori, IZUMI Kiyoshi

JSAI Technical Report, Type 2 SIG, 2021(FIN-027) 05, Oct 9, 2021
Economic Forecasting Model Based on Machine Learning Using Government Bond Market Data

SUIMON Yoshiyuki, IZUMI Kiyoshi, SAKAJI Hiroki

JSAI Technical Report, Type 2 SIG, 2021(FIN-027) 101, Oct 9, 2021
特集：「ファイナンスにおける人工知能応用」「ファイナンスにおける人工知能応用」にあたって

和泉潔, 坂地泰紀

人工知能, 36(3) 260-261, May 1, 2021
Stock Price Prediction Using Limit Order Book Data with Data Stratification and Multi-Phase Pre-training

MATSUBARA Fuyuki, IZUMI Kiyoshi, SAKAJI Hiroki

JSAI Technical Report, Type 2 SIG, 2021(FIN-026) 69, Mar 6, 2021

Committee Memberships

2023 - Present

Organizer, Special Session on Applied Informatics in Finance and Economics (AIFE)
2023 - Present

Technical Committee Member, IEEE Computational Finance and Economics
2023 - Present

幹事, 人工知能学会第二種研究会データ指向構成マイニングとシミュレーション研究会 (DOCMAS)
2023 - Present

編集委員, 情報処理学会編集委員会「知能グループ」
2023 - Present

編集委員, 言語処理学会会誌編集委員会
2022 - Present

副委員長, 電子情報通信学会言語理解とコミュニケーション研究会
2022 - Present

主幹事, 人工知能学会第二種研究会金融情報学研究会
2022 - Present

Program Committee, IEEE International Conference on Big Data
2021 - Present

Program Committee, International Workshop on Financial Technology on the Web (FinWeb)
2021 - Present

編集委員, 人工知能学会編集委員会
2021 - Present

Program Committee, AAAI Conference on Artificial Intelligence
2020 - Present

Program Committee, International Workshop on Financial Technology and Natural Language Processing (FinNLP)
2015 - Present

Program Committee, International Workshop on Web Services and Social Media (WSSM)
2021 - Mar, 2023

プログラム委員, 言語処理学会言語処理学会年次大会
2023 - 2023

Organizer, Special Session on Understanding New Markets by Data Science, Social Science, and Economics
2023 - 2023

Area Chair, The 61st Annual Meeting of the Association for Computational Linguistics (ACL2023)
2021 - 2021

ゲストエディタ, 人工知能学会特集：「ファイナンスにおける人工知能応用」
2021 - 2021

Program Committee, International Workshop on Economics and Natural Language Processing (ECONLP)
2021 - 2021

Technical Session Chair, The 29th International Joint Conference on Artificial Intelligence (IJCAI)
2020 - 2021

幹事, 電子情報通信学会言語理解とコミュニケーション研究会

Books and Other Publications

Pythonによる金融テキストマイニング

和泉, 潔, 坂地, 泰紀, 松島, 裕康

朝倉書店, Jul, 2022 (ISBN: 9784254275889)
Pythonではじめるテキストアナリティクス入門

榊, 剛史, 石野, 亜耶, 小早川, 健, 坂地, 泰紀, 嶋田, 和孝, 吉田, 光男

講談社, Mar, 2022 (ISBN: 9784065274101)
金融・経済分析のためのテキストマイニング

和泉, 潔, 坂地, 泰紀, 松島, 裕康

岩波書店, Jan, 2021 (ISBN: 9784000299015)

Presentations

テキストマイニングを用いた地方景況感の分析

坂地泰紀

第54回サイバーワールド(CW)研究会, Aug, 2023 Invited
経済因果チェーンの構築とその応用

坂地泰紀

Workshop on Microeconomic Analysis of Social Systems and Institutions: Theory, Experiment, and Empirical Studies, Mar, 2023 Invited
BERTと因果抽出を用いた気候変動ナラティブの可視化／指数化

坂地泰紀, 金田規靖

日本銀行金融研究所ファイナンス・ワークショップ, Nov, 2022 Invited
Economic Causal-Chain Search using Text Mining Technology

Hiroki Sakaji

Knowledge Graphs in Finance and Economics, AKBC Conference 2022 Workshop, Nov, 2022 Invited
決算短信定性的情報の活用方法・分析ポイントについて～決算短信への期待～

坂地泰紀

決算短信からのデータ抽出に関するハンズオン「JPX総研(日本取引所グループ)/AWS共催」, Oct, 2022 Invited
地域経済の未来をデータで読み解く！

坂地泰紀, 砂川恵太, 上島邦彦

日本データ取引所主催シンポジウム「データ流通市場の歩き方」, Jan, 2022 Invited
金融テキストマイニングの最新技術とその応用

坂地泰紀

日本経済研究センター主催「AI・ビッグデータ経済モデル研究会」, Jan, 2021 Invited
テキストを用いた経済・経営分析のための人工知能技術

坂地泰紀

長岡市主催「ビジネスのためのAI・IT・IoT活用セミナー」, Dec, 2020 Invited
因果チェーンとネットワーク学習によるソースごとのCOVID19に関する捉え方の違いの抽出

坂地泰紀, 久野遼平

東京大学金融教育研究センター・日本銀行調査統計局共催ビッグデータフォーラム, Nov, 2020 Invited
多様なテキストデータを対象にした金融テキストマイニング

坂地泰紀

第293回MPTフォーラム, May, 2019 Invited
言語処理技術を用いた金融テキストマイニング

坂地泰紀

北海道大学講演会(電子情報通信学会・日本知能情報ファジィ学会), Jul, 2018 Invited

Teaching Experience

Professional Memberships

Works

Causal Extraction

Hiroki Sakaji

Software

Research Projects

AI農業社会実装プロジェクト

農林水産省における研究開発とSociety5.0 との橋渡しプログラム（BRIDGE）, 農林水産省, Sep, 2023 - Mar, 2026
Economic Narrative Simulation Using Causal Information

PRESTO, JST, Oct, 2022 - Mar, 2026
経済シナリオ分析のための因果関係インスタンス認識技術の確立

科学研究費助成事業基盤研究(C), 基盤研究(C), 日本学術振興会, Apr, 2021 - Mar, 2024

坂地泰紀
System Design and Dynamics of Data Exchange Market

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2020 - Mar, 2024
データ取引の市場設計：被験者実験による研究

関西大学ソシオネットワーク戦略研究機構, Apr, 2023 - Mar, 2024
データ流通市場の設計：新しい情報技術の人工市場における実験研究

関西大学ソシオネットワーク戦略研究機構, Apr, 2021 - Mar, 2023

渡邊直樹, 難波敏彦, 早矢仕晃章, 坂地泰紀, 松島裕康, 清水たくみ, 深見嘉明
Construction of A Local Political Corpus that Links the Background, Process, and Results of Discussions and Its Interdisciplinary Application

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2016 - Mar, 2020

Kimura Yasutomo
Company search system for employment support by using financial statements and web information

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2015 - Mar, 2019

Sakai Hiroyuki

Industrial Property Rights

特許6615392 情報処理装置、情報処理方法、およびプログラム

田中良典, 佐久間洋明, 佐藤史仁, 小寺俊哉, 和泉潔, 坂地泰紀
特許6596565 抽出システムおよびプログラム

平野正徳, 坂地泰紀, 松島裕康, 和泉潔, 加藤惇雄, 森岡嗣人, 長尾慎太郎, 木村笙子

Profile Information

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Research History

Education

Awards

Papers

Misc.

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Books and Other Publications

Presentations

Teaching Experience

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Works

Research Projects

Industrial Property Rights

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