Hiroki Sakaji

Publication Activity (10 Years)

Years Active: 2008-2024
Publications (10 Years): 93

Top Topics

Machine Learning

Top Venues

Publications

Hajime Sasaki, Motomasa Fujii, Hiroki Sakaji, Shigeru Masuyama
Enhancing Risk Identification with GNN: Edge Classification in Risk Causality from Securities Reports. Int. J. Inf. Manag. Data Insights 4 (1) (2024)
Kota Tanabe, Masahiro Suzuki, Hiroki Sakaji, Itsuki Noda
JaFIn: Japanese Financial Instruction Dataset. CoRR (2024)
Takeshi Sakumoto, Teruaki Hayashi, Hiroki Sakaji, Hirofumi Nonaka
Metadata-Based Clustering and Selection of Metadata Items for Similar Dataset Discovery and Data Combination Tasks. IEEE Access 12 (2024)
Meiyun Wang, Kiyoshi Izumi, Hiroki Sakaji
LLMFactor: Extracting Profitable Factors through Prompts for Explainable Stock Movement Prediction. ACL (Findings) (2024)
Takehiro Takayanagi, Masahiro Suzuki, Ryotaro Kobayashi, Hiroki Sakaji, Kiyoshi Izumi
Is ChatGPT the Future of Causal Text Mining? A Comprehensive Evaluation and Analysis. CoRR (2024)
Masahiro Suzuki, Hiroki Sakaji
Economy Watchers Survey provides Datasets and Tasks for Japanese Financial Domain. CoRR (2024)
Meiyun Wang, Kiyoshi Izumi, Hiroki Sakaji
LLMFactor: Extracting Profitable Factors through Prompts for Explainable Stock Movement Prediction. CoRR (2024)
Masahiro Suzuki, Hiroki Sakaji, Masanori Hirano, Kiyoshi Izumi
Constructing and analyzing domain-specific language model for financial text mining. Inf. Process. Manag. 60 (2) (2023)
Issey Sukeda, Masahiro Suzuki, Hiroki Sakaji, Satoshi Kodera
JMedLoRA: Medical Domain Adaptation on Japanese Large Language Models using Instruction-tuning. CoRR (2023)
Masanori Hirano, Masahiro Suzuki, Hiroki Sakaji
llm-japanese-dataset v0: Construction of Japanese Chat Dataset for Large Language Models and its Methodology. CoRR (2023)
Hiroki Sakaji, Ryotaro Kobayashi, Kiyoshi Izumi, Hiroyuki Mitsugi, Wataru Kuramoto
Summarization of Investment Reports Using Pre-trained Model. IIAI-AAI (2023)
Hiroki Sakaji, Kiyoshi Izumi
Financial Causality Extraction Based on Universal Dependencies and Clue Expressions. New Gener. Comput. 41 (4) (2023)
Shingo Sashida, Kiyoshi Izumi, Hiroki Sakaji
Extraction SDGs-related sentences from Sustainability Reports using BERT and ChatGPT. IIAI-AAI (2023)
Masahiro Suzuki, Masanori Hirano, Hiroki Sakaji
From Base to Conversational: Japanese Instruction Dataset and Tuning Large Language Models. CoRR (2023)
Masanori Hirano, Masahiro Suzuki, Hiroki Sakaji
llm-japanese-dataset v0: Construction of Japanese Chat Dataset for Large Language Models and Its Methodology. NBiS (2023)
Masanori Hirano, Hiroki Sakaji, Kiyoshi Izumi
Policy Gradient Stock GAN for Realistic Discrete Order Data Generation in Financial Markets. IIAI-AAI (2023)
Rei Taguchi, Hiroki Sakaji, Kiyoshi Izumi, Yuri Murayama
Constructing Sentiment Signal-Based Asset Allocation Method with Causality Information. New Gener. Comput. 41 (4) (2023)
Hiroki Sakaji, Noriyasu Kaneda
Indexing and Visualization of Climate Change Narratives Using BERT and Causal Extraction. BigData (2023)
Masahiro Suzuki, Masanori Hirano, Hiroki Sakaji
From Base to Conversational: Japanese Instruction Dataset and Tuning Large Language Models. BigData (2023)
Naoto Minakawa, Kiyoshi Izumi, Hiroki Sakaji, Hitomi Sano
Transaction Prediction by Using Graph Neural Network and Textual Industry Information. JSAI-isAI Workshops (2022)
Rei Taguchi, Hiroki Sakaji, Kiyoshi Izumi
SSAAM: Sentiment Signal-based Asset Allocation Method with Causality Information. Big Data (2022)
Masanori Hirano, Kiyoshi Izumi, Hiroki Sakaji
STBM+: Advanced Stochastic Trading Behavior Model for Financial Markets using Residual Blocks or Transformers. New Gener. Comput. 40 (1) (2022)
Kei Nakagawa, Shingo Sashida, Hiroki Sakaji
Investment Strategy via Lead Lag Effect using Economic Causal Chain and SSESTM Model. IIAI-AAI (2022)
Masanori Hirano, Hiroki Sakaji, Kiyoshi Izumi
Concept and Practice of Artificial Market Data Mining Platform. CIFEr (2022)
Teruaki Hayashi, Hiroyasu Matsushima, Hiroki Sakaji, Yoshiaki Fukami, Takumi Shimizu
Models of Exchanged Datasets and Interactions of Buyers in the Data Market: Toward Multi-Agent Simulators for System Design. KES (2022)
Masahiro Suzuki, Hiroki Sakaji, Kiyoshi Izumi, Yasushi Ishikawa
Forecasting Stock Price Trends by Analyzing Economic Reports With Analyst Profiles. Frontiers Artif. Intell. 5 (2022)
Hiroki Sakaji, Masahiro Suzuki, Kiyoshi Izumi, Hiroyuki Mitsugi
Gradual Further Pre-training Architecture for Economics/Finance Domain Adaptation of Language Model. Big Data (2022)
Toshihiko Nanba, Kazuhito Ogawa, Naoki Watanabe, Teruaki Hayashi, Hiroki Sakaji
A Model of Pricing Data and Their Constituent Variables Traded in Two-Sided Markets with Resale: A Subject Experiment. Big Data (2022)
Masanori Hirano, Kiyoshi Izumi, Hiroki Sakaji
Implementation of Actual Data for Artificial Market Simulation. AAMAS (2022)
Naoto Minakawa, Kiyoshi Izumi, Hiroki Sakaji, Hitomi Sano
Graph Representation Learning of Banking Transaction Network with Edge Weight-Enhanced Attention and Textual Information. WWW (Companion Volume) (2022)
Rei Taguchi, Hikaru Watanabe, Hiroki Sakaji, Kiyoshi Izumi, Kenji Hiramatsu
Constructing Equity Investment Strategies Using Analyst Reports and Regime Switching Models. Frontiers Artif. Intell. 5 (2022)
Takehiro Takayanagi, Hiroki Sakaji, Kiyoshi Izumi
SETN: Stock Embedding Enhanced with Textual and Network Information. Big Data (2022)
Motomasa Fujii, Hiroki Sakaji, Shigeru Masuyama, Hajime Sasaki
Extraction and classification of risk-related sentences from securities reports. Int. J. Inf. Manag. Data Insights 2 (2) (2022)
Yoshiaki Fukami, Takumi Shimizu, Teruaki Hayashi, Hiroki Sakaji, Hiroyasu Matsushima
Centralized Versus Decentralized Digital Identity Architectures: Simulation Models of Data Exchange. AAAI Spring Symposium: HFIF (2022)
Rei Taguchi, Hikaru Watanabe, Hiroki Sakaji, Kiyoshi Izumi, Kenji Hiramatsu
Proposal for Turning Point Detection Method Using Financial Text and Transformer. JSAI-isAI Workshops (2022)
Naoto Minakawa, Kiyoshi Izumi, Hiroki Sakaji
Bilateral Trade Flow Prediction by Gravity-informed Graph Auto-encoder. Big Data (2022)
Masanori Hirano, Hiroki Sakaji, Kiyoshi Izumi
Policy Gradient Stock GAN for Realistic Discrete Order Data Generation in Financial Markets. CoRR (2022)
Rei Taguchi, Hikaru Watanabe, Masanori Hirano, Masahiro Suzuki, Hiroki Sakaji, Kiyoshi Izumi, Kenji Hiramatsu
Market Trend Analysis Using Polarity Index Generated from Analyst Reports. IEEE BigData (2021)
Hiroki Sakaji, Teruaki Hayashi, Yoshiaki Fukami, Takumi Shimizu, Hiroyasu Matsushima, Kiyoshi Izumi
Retrieving of Data Similarity using Metadata on a Data Analysis Competition Platform. IEEE BigData (2021)
Teruaki Hayashi, Takumi Shimizu, Yoshiaki Fukami, Hiroki Sakaji, Hiroyasu Matsushima
Growing Process of Communities on Data Platforms: Case Analysis of a COVID-19 Dataset. IEEE BigData (2021)
Teruaki Hayashi, Hiroki Sakaji, Hiroyasu Matsushima, Yoshiaki Fukami, Takumi Shimizu, Yukio Ohsawa
Data Combination for Problem-Solving: A Case of an Open Data Exchange Platform. Rev. Socionetwork Strateg. 15 (2) (2021)
Masanori Hirano, Hiroyasu Matsushima, Kiyoshi Izumi, Hiroki Sakaji
Implementation of Real Data for Financial Market Simulation Using Clustering, Deep Learning, and Artificial Financial Market. PRIMA (2020)
Masanori Hirano, Hiroyasu Matsushima, Kiyoshi Izumi, Hiroki Sakaji
STBM: Stochastic Trading Behavior Model for Financial Markets. JSAI (2020)
Hiroki Sakaji, Teruaki Hayashi, Kiyoshi Izumi, Yukio Ohsawa
Verification of Data Similarity using Metadata on a Data Exchange Platform. IEEE BigData (2020)
Masanori Hirano, Kiyoshi Izumi, Hiroyasu Matsushima, Hiroki Sakaji
Comparing Actual and Simulated HFT Traders' Behavior for Agent Design. J. Artif. Soc. Soc. Simul. 23 (3) (2020)
Yoshiyuki Suimon, Kiyoshi Izumi, Hiroki Sakaji, Takashi Shimada, Hiroyasu Matsushima
Estimating Manufacturing Activity via Machine Learning Analysis of High-frequency Electricity Demand Patterns. IIAI-AAI (2020)
Tomoki Ito, Kota Tsubouchi, Hiroki Sakaji, Tatsuo Yamashita, Kiyoshi Izumi
Contextual Sentiment Neural Network for Document Sentiment Analysis. Data Sci. Eng. 5 (2) (2020)
Tomoki Ito, Kota Tsubouchi, Hiroki Sakaji, Tatsuo Yamashita, Kiyoshi Izumi
SSNN: Sentiment Shift Neural Network. SDM (2020)
Tomoki Ito, Kota Tsubouchi, Hiroki Sakaji, Tatsuo Yamashita, Kiyoshi Izumi
Word-Level Contextual Sentiment Analysis with Interpretability. AAAI (2020)
Teruaki Hayashi, Hiroki Sakaji, Hiroyasu Matsushima, Yoshiaki Fukami, Takumi Shimizu, Yukio Ohsawa
Data Combination for Problem-solving: A Case of an Open Data Exchange Platform. CoRR (2020)
Masahiro Suzuki, Hiroki Sakaji, Kiyoshi Izumi, Hiroyasu Matsushima, Yasushi Ishikawa
Forecasting Net Income Estimate and Stock Price Using Text Mining from Economic Reports. Inf. 11 (6) (2020)
Tomoki Ito, Hiroki Sakaji, Kiyoshi Izumi, Kota Tsubouchi, Tatsuo Yamashita
GINN: gradient interpretable neural networks for visualizing financial texts. Int. J. Data Sci. Anal. 9 (4) (2020)
Tomoki Ito, Kota Tsubouchi, Hiroki Sakaji, Kiyoshi Izumi, Tatsuo Yamashita
CSNN: Contextual Sentiment Neural Network. ICDM (2019)
Tomoki Ito, Hiroki Sakaji, Kiyoshi Izumi
Segment Information Extraction from Financial Annual Reports Using Neural Network. JSAI (2019)
Hiroki Sakaji, Akio Kobayashi, Masaki Kohana, Yasunao Takano, Kiyoshi Izumi
Card Price Prediction of Trading Cards Using Machine Learning Methods. NBiS (2019)
Yasunao Takano, Yusuke Iijima, Kou Kobayashi, Hiroshi Sakuta, Hiroki Sakaji, Masaki Kohana, Akio Kobayashi
Improving Document Similarity Calculation Using Cosine-Similarity Graphs. AINA (2019)
Yoshiyuki Suimon, Hiroki Sakaji, Takashi Shimada, Kiyoshi Izumi, Hiroyasu Matsushima
Japanese long-term interest rate forecast considering the connection between the Japanese and US yield curve. CIFEr (2019)
Masanori Hirano, Hiroki Sakaji, Shoko Kimura, Kiyoshi Izumi, Hiroyasu Matsushima, Shintaro Nagao, Atsuo Kato
Related Stocks Selection with Data Collaboration Using Text Mining. Inf. 10 (3) (2019)
Hiroki Sakaji, Masaki Kohana, Akio Kobayashi, Hiroyuki Sakai
Enriching folksonomy for online videos. Int. J. Grid Util. Comput. 10 (3) (2019)
Kyoto Yono, Kiyoshi Izumi, Hiroki Sakaji, Hiroyasu Matsushima, Takashi Shimada
Analysis of the Macroeconomic Uncertainty Based on the News-based Textual Data with Financial Market. IIAI-AAI (2019)
Tomoki Ito, Kota Tsubouchi, Hiroki Sakaji, Tatsuo Yamashita, Kiyoshi Izumi
Word-level Sentiment Visualizer for Financial Documents. CIFEr (2019)
Masahiro Suzuki, Toshiya Katagi, Hiroki Sakaji, Kiyoshi Izumi, Yasushi Ishikawa
Stock Price Analysis Using Combination of Analyst Reports and Several Documents. ICDM Workshops (2019)
Yuta Niki, Hiroki Sakaji, Kiyoshi Izumi, Hiroyasu Matsushima
Causality Existence Classification from Multilingual Texts Using End-to-End LSTM Models. ICDM Workshops (2019)
Hirofumi Yamamoto, Hiroki Sakaji, Hiroyasu Matsushima, Yuki Yamashita, Kyohei Osawa, Kiyoshi Izumi, Takashi Shimada
Forecasting Crypto-Asset Price Using Influencer Tweets. AINA (2019)
Atsuki Nakayama, Kiyoshi Izumi, Hiroki Sakaji, Hiroyasu Matsushima, Takashi Shimada, Kenta Yamada
Short-term Stock Price Prediction by Analysis of Order Pattern Images. CIFEr (2019)
Yoshiyuki Suimon, Hiroki Sakaji, Takashi Shimada, Kiyoshi Izumi, Hiroyasu Matsushima
Extraction of Relationship between Japanese and US Interest Rates using Machine Learning Methods. IIAI-AAI (2019)
Kiyoshi Izumi, Hiroki Sakaji
Economic Causal-Chain Search Using Text Mining Technology. IJCAI (2019)
Hiroki Sakaji, Yasutomo Kimura, Kiyoshi Izumi, Hiroyasu Matsushima
Extraction of Volitional Utterances from Japanese Local Political Corpus. ICDM Workshops (2019)
Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto
File Assignment Control for a Web System of Contents Categorization. Trans. Comput. Collect. Intell. 33 (2019)
Yoshinori Tanaka, Syunya Kodera, Fumihito Sato, Hiroki Sakaji, Kiyoshi Izumi
The Extraction of the Future-Oriented Sentences from Annual Reports. IIAI-AAI (2019)
Iwao Maeda, Hiroyasu Matsushima, Hiroki Sakaji, Kiyoshi Izumi, David deGraw, Atsuo Kato, Michiharu Kitano
Effectiveness of Uncertainty Consideration in Neural-Network-Based Financial Forecasting. IIAI-AAI (2019)
Hiroki Sakaji, Akio Kobayashi, Masaki Kohana, Yasunao Takano, Kiyoshi Izumi
Estimation of Tags Using Various Data for Online Videos. AINA (2019)
Ryo Hamawakai, Jun'ichi Ozaki, Kiyoshi Izumi, Takashi Shimada, Hiroki Sakaji, Hiroyasu Matsushima
Chain Bankruptcy Simulation Considering Investment from Banks to Companies. SMC (2019)
Kyoto Yono, Kiyoshi Izumi, Hiroki Sakaji, Hiroyasu Matsushima, Takashi Shimada
Extraction of Focused Topic and Sentiment of Financial Market by using Supervised Topic Model for Price Movement Prediction. CIFEr (2019)
Kei Nakagawa, Shingo Sashida, Hiroki Sakaji, Kiyoshi Izumi
Economic Causal Chain and Predictable Stock Returns. IIAI-AAI (2019)
Ryo Hamawaki, Kiyoshi Izumi, Hiroki Sakaji, Takashi Shimada, Hiroyasu Matsushima
Chain bankruptcy size in inter-bank networks: the effects of asset price volatility and the network structure. J. Comput. Soc. Sci. 2 (1) (2019)
Kaito Takano, Miryu Tanaka, Hiroyuki Sakai, Ryozo Kitajima, Takahisa Ota, Chinatsu Tanabe, Hiroki Sakaji
Extraction of Characteristic Terms from Patent Documents for Technical Trend Analysis. IIAI-AAI (2019)
Masanori Hirano, Hiroki Sakaji, Shoko Kimura, Kiyoshi Izumi, Hiroyasu Matsushima, Shintaro Nagao, Atsuo Kato
Selection of Related Stocks using Financial Text Mining. ICDM Workshops (2018)
Tomoki Ito, Hiroki Sakaji, Kota Tsubouchi, Kiyoshi Izumi, Tatsuo Yamashita
Text-Visualizing Neural Network Model: Understanding Online Financial Textual Data. PAKDD (3) (2018)
Hokuto Ototake, Hiroki Sakaji, Keiichi Takamaru, Akio Kobayashi, Yuzu Uchida, Yasutomo Kimura
Web-based system for Japanese local political documents. Int. J. Web Inf. Syst. 14 (3) (2018)
Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto
A Parallel Calculation Method on Web Browser for Contents Categorization. AINA Workshops (2018)
Akio Kobayashi, Hiroki Sakaji, Masaki Kohana
A Method for Extracting Correct Links from Automatic Created Links on Folksonomy. NBiS (2017)
Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto
A Topic Trend on P2P Based Social Media. NBiS (2017)
Tomoki Ito, Hiroki Sakaji, Kiyoshi Izumi, Kota Tsubouchi, Tatsuo Yamashita
Development of sentiment indicators using both unlabeled and labeled posts. SSCI (2017)
Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto
A Distributed Calculation Scheme for Contents Categorization. AINA (2017)
Shiori Kitamori, Hiroyuki Sakai, Hiroki Sakaji
Extraction of sentences concerning business performance forecast and economic forecast from summaries of financial statements by deep learning. SSCI (2017)
Hiroki Sakaji, Atsuya Miyazaki, Hiroyuki Sakai, Kiyoshi Izumi
Extracting Laboratory Front Pages from University Websites. NBiS (2017)
Hiroki Sakaji, Risa Murono, Hiroyuki Sakai, Jason Bennett, Kiyoshi Izumi
Discovery of rare causal knowledge from financial statement summaries. SSCI (2017)
Tomoki Ito, Hiroki Sakaji, Kiyoshi Izumi, Kota Tsubouchi, Tatsuo Yamashita
Development of an Interpretable Neural Network Model for Creation of Polarity Concept Dictionaries. ICDM Workshops (2017)
Hokuto Ototake, Hiroki Sakaji, Keiichi Takamaru, Akio Kobayashi, Yuzu Uchida, Yasutomo Kimura
A Web-Based Visualization System for Interdisciplinary Research Using Japanese Local Political Corpus. NBiS (2017)
Hiroki Sakaji, Junya Ishibuchi, Hiroyuki Sakai
Extraction of polarity comments from Nico Nico Douga. Int. J. Space Based Situated Comput. 6 (3) (2016)
Hiroki Sakaji, Masaki Kohana, Akio Kobayashi, Hiroyuki Sakai
Estimation of Tags via Comments on Nico Nico Douga. NBiS (2016)
Yasutomo Kimura, Keiichi Takamaru, Takuma Tanaka, Akio Kobayashi, Hiroki Sakaji, Yuzu Uchida, Hokuto Ototake, Shigeru Masuyama
Creating Japanese Political Corpus from Local Assembly Minutes of 47 prefectures. ALR@COLING (2016)
Hiroki Sakaji, Junya Ishibuchi, Hiroyuki Sakai
Extracting Polarity Comments from Nico Nico Douga. NBiS (2015)
Akihito Ikeda, Akio Kobayashi, Hiroki Sakaji, Shigeru Masuyama
Classification of Comments on Nico Nico Douga for Annotation Based on Referred Contents. NBiS (2015)
Yusuke Suzuki, Hirofumi Nonaka, Hiroki Sakaji, Akio Kobayashi, Hiroyuki Sakai, Shigeru Masuyama
NTCIR-8 Patent Mining Task at Toyohashi University of Technology. NTCIR (2010)
Hiroki Sakaji, Satoshi Sekine, Shigeru Masuyama
Extracting Causal Knowledge Using Clue Phrases and Syntactic Patterns. PAKM (2008)
Hiroki Sakaji, Hiroyuki Sakai, Shigeru Masuyama
Automatic Extraction of Basis Expressions That Indicate Economic Trends. PAKDD (2008)