AI・データ分析

AI & Data Analysis

Machine Learning / Deep Learning / Optimization / Quantum Computing / Simulation / Data Assimilation

Technologies that create near-reality models by combining large-scale simulations with observational data

We research foundational technologies that fuse AI techniques—including machine learning and deep learning—with mathematical optimization and simulation to solve complex real-world problems. Our work spans large language model (LLM) applications, improving prediction model accuracy through data assimilation (AI prediction and data assimilation), AI surrogate models that rapidly approximate simulations, and mathematical approaches to combinatorial optimization.

We also advance diverse learning paradigms: knowledge distillation for transferring knowledge from teacher to lightweight models, robust learning methods for class-imbalanced data, and reinforcement learning for acquiring strategies through trial and error. These techniques serve as foundations directly linked to solving real-world challenges our lab addresses, including traffic optimization, weather prediction, disaster forecasting, and smart agriculture.

Privacy Protection / Data Utilization

Data anonymization, differential privacy, secure computation, and privacy-preserving machine learning

We research technologies to promote data utilization and distribution while properly protecting personal and sensitive information. Key research themes include statistical privacy guarantees through differential privacy, distributed data analysis techniques where multiple organizations analyze data without sharing raw data, and machine unlearning to remove the influence of specific data from trained models.

We also work on privacy-preserving people flow measurement using 3D point cloud data, secure computation for processing encrypted data, and synthetic data generation that maintains statistical properties of real data while preventing individual identification. These technologies contribute to privacy-conscious urban sensing, safe secondary use of medical data, and building inter-organizational data collaboration platforms.

Socially-Aware Robot Navigation Using Large Language Models: System and Evaluation

Best Doctoral Symposium Paper Award

Xuqing Liu, Tatsuya Amano, Hamada Rizk, Hirozumi Yamaguchi

ICDCN 2026 Doctoral Symposium

DOI 10.1145/3737611.3776944

Evaluating Attribute Inference Risks in Urban Care Taxi Arrival Time Prediction Models Using Geospatial Data

Best Workshop Paper Candidate

Yuya Takeuchi, Haruki Yonekura, Kyosuke Yamashita, Hirozumi Yamaguchi

The 14th International Workshop on Urban Computing, held in conjunction with the 31st ACM SIGKDD 2025

Quantum Approximation Method and Neural-Integrated Mathematical Optimization Algorithm for Elderly Care Taxi Dispatch Problem

優秀論文賞

花園 智行, 天野 辰哉, 山口 弘純

研究報告高度交通システムとスマートコミュニティ(ITS),2024-ITS-97(4),1-8 (2024-05-08) , 2188-8965

Quantum ComputingCombinatorial Optimization +9

Efficient Machine Unlearning for Mobility Logs with Spatio-Temporal and Natural-Language Data

Haruki Yonekura, Ren Ozeki, Tatsuya Amano, Hamada Rizk, Hirozumi Yamaguchi

In Proceedings of the 33rd ACM International Conference on Advances in Geographic Information Systems (SIGSPATIAL '25). pp. 1186–1189.

DOI 10.1145/3748636.3763226

Machine UnlearningPrivacy +1

A Precise and Scalable Indoor Positioning System Using Cross-Modal Knowledge Distillation

Hamada Rizk, Ahmed Elmogy, Mohamed Rihan, Hirozumi Yamaguchi

Sensors, Volume 24, Issue 22

DOI 10.3390/s24227322

Understanding Privacy Awareness in Immersive Spatial Sharing System

Tomokazu Matsui, Shigetomo Sakuma, Yuki Mishima, Hirohiko Suwa, Keiichi Yasumoto, Tatsuya Amano, and Hirozumi Yamaguchi

Sensors and Materials, Volume 36, Number 10(3) (2024), pp. 4567-4583

DOI 10.18494/SAM5213

LocaLingua: Leveraging Language Models for Cross-Building WiFi Mapping

Ahmed Hesham, Eman Samir, Hamada Rizk and Moustafa Youssef

In Proceedings of the 32nd ACM International Conference on Advances in Geographic Information Systems (SIGSPATIAL '24). pp.723–724.

DOI 10.1145/3678717.3695764

Indoor Object Recognition with WiFi RSSI-Integrated Visual-Language Models

Haruki YONEKURA, Hamada Rizk, Hirozumi Yamaguchi

The 22nd ACM International Conference on Mobile Systems, Applications, and Services (MobiSys'24 Posters)

Point CloudVisual Language Model +4

Privacy Awareness of Spatial Sharing System based on 3D Point Cloud: Insights from a User Survey

Sakuma Shigetomo, Yuki Mishima, Tomokazu Matsui, Hirohiko Suwa, Keiichi Yasumoto, Tatsuya Amano, Hirozumi Yamaguchi

2024 IEEE International Conference on Pervasive Computing and Communications Workshops and other Affiliated Events (PerCom Workshops, SPT-IoT’24), 2024.

DOI 10.1109/PerComWorkshops59983.2024.10503178

Visual Privacy Control for Metaverse and the Beyond

Tatsuya Amano; Teruhiro Mizumoto; Srikant Manas Kala; Hirozumi Yamaguchi; Tomokazu Matsui; Keiichi Yasumoto

IEEE Pervasive Computing, vol. 23, no. 01, pp. 10-17, Jan.-March 2024

DOI 10.1109/MPRV.2024.3365989

Data Balancing for Thermal Comfort Datasets Using GANs

Hiroki Yoshikawa, Akira Uchiyama, Teruo Higashino

Proceedings of the 8th ACM International Conference on Systems for Energy-Efficient Buildings, Cities, and Transportation (BuildSys 2021) Workshops, Coimbra, Portugal, November 17-18, 2021.

Machine learningGenerative adversarial networks +1

Estimation of Thermal Sensation Based on Machine Learning via Physiological Sensing

Hiroki Yoshikawa, Akira Uchiyama, Teruo Higashino

IEEE Access, vol. 9, pp. 102835 - 102846, July, 2021

DOI 10.1109/ACCESS.2021.3097882

Machine learningTransfer learning +5

Time-Series Physiological Data Balancing for Regression

Hiroki Yoshikawa, Akira Uchiyama, Teruo Higashino

Proceedings of the 2021 IEEE International Conference on Artificial Intelligence and Computer Applications (ICAICA 2021), Dalian, China, June 28-30, 2021.

Machine learningImbalanced Dataset +2