研究者詳細 - 我妻　広明

論文 - 我妻　広明

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Developing a Sound-Based Method to Synchronize Multiple Videos Recorded by Multiple Sound Sources 査読有り国際誌

Jargal D., Kato R., Taniguchi T., Shibata K., Koga T., Al Aama O., Tamukoh H., Wagatsuma H.

Proceedings of International Conference on Artificial Life and Robotics 809 - 814 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The surround environmental monitoring from a vehicle on the road is important for the driving behavior analysis as well as the monitoring of driver’s operations. A light weight mobile camera is useful for the record of multiple directions from the vehicle simultaneously. However, the timing synchronization is an important issue need to be solved. In this purpose, we proposed the sound-based method to synchronize different videos recorded with environmental sounds. In this task, the extraction of common sound features and amplifying of the features are necessary to superimpose those sound profiles to find consisting time points. In the validation the effectiveness, we used recoded videos from the bus driven by an expert driver.

Scopus

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Conditional checkpoint selection strategy based on sentence structures for text to triple translation using BiLSTM encoder–decoder model 査読有り国際誌

Shrivastava M., Shibata K., Wagatsuma H.

International Journal of Data Science and Analytics 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

Understanding natural languages is one of the primary goals of artificial intelligence. Natural languages contain multiple clauses and long-term dependencies making them difficult for machines to understand, also sentences can have different types of dependency structures such as simple, compound, or complex which makes interpretation further difficult. One alternative way is to represent language using predicate logic which is easier for machines to understand. The task of manually converting language to predicate logic or ontologies can be cumbersome, but it can be automated using machine translation. For these ontologies to be effective the quality of translation should be good. In this research, we focus on analyzing the effect of sentence structure on machine translation quality, i.e., how the model performance is affected if the dataset is structurally skewed meaning it has sentences of similar structure more as compared to other structures. We further investigate the model learning behavior by performing statistical analysis on features learned by these models and understand the effects of sentence structure on these learned features. The statistical analysis helps us understand the distribution followed by the features and based on the insights gained we proposed a conditional checkpoint selection strategy centered on sentence structure along with utilizing Modified J-Divergence as a loss function for optimizing model performance for different sentence structures thus achieving better translation quality.

DOI： 10.1007/s41060-024-00672-0

Scopus

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Analyzing Eye-Tracking Data to Detect Joint Attention in Hexgame Experiments 査読有り国際誌

Yang Y., Kato R., Shibata K., Chame H.F., Bougrain L., Wagatsuma H.

Proceedings of International Conference on Artificial Life and Robotics 935 - 939 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This study aims to explore the mechanisms of joint attention in a strategic game experiment by analyzing Tobii eyetracking data. In this experiment, two participants play Hexgame, during which the gaze direction is tracked and projected onto the game’s board plane through perspective geometry, in order to track attention sharing correlates at particular stages of the game from behavioral data. The primary focus of this study is the analysis of eye-tracking data to identify attention coordination between players during the progression of the game. Future work will expand this framework to assess win probabilities and predict subsequent moves, providing deeper insights into strategic decisionmaking.

Scopus

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An Integration of Contact Force Models with Multibody Dynamics Analyses for Human Joint Mechanisms and Effects of Viscoelastic Ground Contact 査読有り国際誌

Kasai Shintaro, Batbaatar Dondogjamts, Wagatsuma Hiroaki

人工生命とロボットに関する国際会議予稿集 ( 株式会社ALife Robotics ) 29 994 - 998 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In human movement and rehabilitation analyses, human joint dynamics is a key to consider the incorporation of spring-damper components, flexible bodies and contact forces analytically. In the present study, an analytical method for human gaits were introduced to integrate those essential elements, and viscoelastic properties of musculoskeletal system were modeled with the absolute nodal coordination formula (ANCF) method representing flexible body motions. A contact force model simulates interactions between different body segments and the environment. The proposed system is applied to a slider crank mechanism, demonstrating its capabilities in human joint motion analysis using integrated dynamic model within the framework of multibody dynamics (MBD), which realizes dynamic/inverse dynamics for human biomechanics.

DOI： 10.5954/icarob.2024.gs4-3

CiNii Research

An Adaptive Control Method for a Knee-Joint Prosthetic Leg Toward Dynamic Stability and Gait Optimization 査読有り国際誌

Ge Y., Purevdorj C., Kasai S., Wagatsuma H.

Proceedings of International Conference on Artificial Life and Robotics 861 - 866 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This paper presents a hybrid control strategy that combines Model Predictive Control (MPC) and Linear Quadratic Regulator (LQR) to achieve robust and stable tracking of human knee joint motion. The state-space model of the system is discretized to facilitate real-time implementation. MPC is employed to track the knee joint trajectory during dynamic motion, while the LQR controller is activated at critical points, particularly when the joint angle approaches zero, to stabilize the system and ensure safety.

Scopus

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A MBD-Based Dynamic Analysis Framework with a Viscoelastic Contact Model and Flexible Elements Toward Human Power Assistive Devices 査読有り国際誌

Kasai Shintaro, Batbaatar Dondogjamts, Wagatsuma Hiroaki

Journal of Robotics, Networking and Artificial Life ( 株式会社 ALife Robotics ) 10 ( 4 ) 318 - 322 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

It is important for the analysis of human movement and rehabilitation to incorporate spring-damper components, flexible materials, and contact force into the joint model considering human dynamics. In this study, the absolute nodal coordination formula (ANCF) method is introduced to the analytical model for the viscoelastic properties of the musculoskeletal system which is essential for analyzing human walking motion, and the flexible characteristics of the human body is reproduced. The consideration of a contact force model makes it possible to simulate contact actions between elements of the human body and the interaction with the environment. The proposed integrated framework is applied to multibody dynamics (MBD) based slider-crank mechanisms to demonstrate the dynamics/inverse dynamics analysis of human joint biomechanics.

DOI： 10.57417/jrnal.10.4_318

Kyutacar

CiNii Research

その他リンク： https://kyutech.repo.nii.ac.jp/records/2001659

A Mathematical Framework for Logit Model in Transportation Mode Choice Analysis 査読有り国際誌

Altaweel A., Mine K., Lee B.Y., Yoon J.S., Wagatsuma H.

Proceedings of International Conference on Artificial Life and Robotics 891 - 895 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Traditional transportation demand forecasting has relied on massive zone-specific aggregations, which assume a linear demand increase. Such models may lack the flexibility needed to perform dynamic and context-sensitive analyses. Recently, disaggregated behavioral models have gained prominence for requiring less data and enabling sensitivity analyses in policy decisions. This study explores the feasibility of a model focusing on the mathematical formulation and validation of the transportation mode choice model. The study uses the logit model with a non-linear probability distribution function represented by a logistic curve and incorporates a linear combination of independent predictor variables. The mathematical model is examined for its ability to estimate choice probabilities. The methodology is formulated to be adaptable to diverse contexts that provide an analytical framework for transportation systems independently of geographic or demographic considerations.

Scopus

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A Gait Analysis with Multibody Dynamics Toward Energy-Efficient Active Knee Prostheses 査読有り国際誌

Purevdorj C., Ge Y., Kasai S., Batbaatar D., Erdenesuren N., Wagatsuma H.

Proceedings of International Conference on Artificial Life and Robotics 867 - 871 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In general, prosthetic knee users have a large stress in the locomotion due to less smoothness and unnecessary energy consumption. In the passive prosthesis, it is difficult to regulate the stiffness depending on the ground contact force. In consideration of designs for such an adaptivity to improve passive systems, we propose an artificial knee kinematics design to absorb the redundant contact force for the smooth and stable walking and explore necessary constraints for the proposed mechanics to be able to have multi-functions not only for walking but also knee flexion accumulating the power for jumping. In the analysis, we used Multibody Dynamics (MBD) to investigate. This result will contribute to design an integrated dynamic model by incorporating a flexible body and ground contact forces in various purposes.

Scopus

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A Data Format Integration of Open-Street-Map and Lanelet2 Toward the Ontology Framework for Safety Automated driving systems 査読有り国際誌

Al Aama O., Koga T., Taniguchi T., Jargal D., Oishi J., Nemoto S., Mizushina W., Hirao K., Wagatsuma H., Tamukoh H.

Proceedings of International Conference on Artificial Life and Robotics 802 - 808 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This study proposes a framework that integrates Open Street Map (OSM) data with ontology-based systems to enhance automated driving. OSM provides static geographical data, while the Lanelet2 mapping framework incorporates lane level road information and topological relationships. This combination enables advanced testing of vehicle behaviour in realistic environments. Ontology-based integration offers semantic representations of road elements and traffic rules, supporting the modeling of complex driving scenarios. By structuring spatial and semantic data, this approach ensures accurate simulation and testing, facilitating applications such as traffic analysis, route optimization, and automated driving decision-making. The framework enhances scalability, precision, and safety in autonomous vehicle development, enabling more effective testing and validation. This integration supports comprehensive, context-aware simulations that improve vehicle response to real-world driving conditions.

Scopus

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Trigger Circuit Board Design for Coordinated EEG, Motion, and Eye Gazing Recording in Two Person: A System Integration Approach 査読有り

Fujiwara M., Duc P.H.H., Bougrain L., Hénaff P., Wagatsuma H.

Journal of Robotics Networking and Artificial Life ( 株式会社 ALife Robotics ) 11 ( 1 ) 38 - 43 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

Integrative data analysis, which involves the simultaneous recording of EEG, motion, and eye gazing in humans, is increasingly recognized for its potential to yield new scientific insights. To establish these simultaneous measurements, signal synchronization of multiple time courses is necessary, time data from different measurement instruments must be managed finely, and time offsets must be corrected. However, such accurate time management from the triggers requires a fine design of circuit boards with the integrated transistor-transistor logic signal voltage. This study presents a design concept and mechanism for a trigger circuit, demonstrating that the proposed experimental system effectively addresses these challenges. A custom trigger circuit board, combined with a microcontroller, was developed to handle voltage signals and ensure seamless synchronization between different devices. The trigger signal output from the circuit board can be controlled and demonstrated through system integration across multiple measurement instruments. It should be noted that the accuracy of trigger signal output may be influenced in part by the system clock of the operating system, but the integrated trigger circuit board and the measurement system enable precise and reliable synchronous measurements, with the potential for further synchronous analysis.

DOI： 10.57417/jrnal.11.1_38

Kyutacar

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105007205883&origin=inward

三種把持動作の脳波解析における把持開始タイミング抽出システム開発と試行個別的解析手法の提案

柴田宏誠，ファンホアンフュドゥック，我妻広明

電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 ( 一般社団法人電子情報通信学会 ) 122 ( 292 ) 57 - 61 2025年01月

分娩第2期の児頭娩出時における熟練助産師と助産学生の視線比較：アイトラッキングによる分析

内江希, 中沢愛実, 梅田尚子, 四谷淳子, 谷口知希, 加藤れな, 我妻広明, 池田和司

第13回看護理工学会学術集会 ( 看護理工学会 ) 2025年01月

A Synchronization Method of EEG and Gaze Timeseries in the Simultaneous EEG-Motion-Gaze Recording of "Look This Way" Game 査読有り国際誌

Rena Kato, Kosei Shibata, Yide Yang, Masayuki Fujiwara, Laurent Bougrain, Hiroaki Wagatsuma

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

Are competitive strategic evaluations and joint attention to path crossings related when humans play Hexgame? 査読有り国際誌

Yide Yang, Rena Kato, Kosei Shibata, Hendry F. Chame, Laurent Bougrain, Hiroaki Wagatsuma

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

Towards answering the question: are strategic decision-making and joint attention related when playing Hex-game with humans and robots? 査読有り国際誌

Tonan Kogami, Kosei Shibata, Hiroaki Wagatsuma, Laurent Bougrain, Tomohiro Shibata, Hendry F. Chame

Proceedings of Journees Nationales de la Robotique Humanoide (JNRH 2024) 2025年01月

Vehicle Behavior Analysis and Risk Detection in Autonomous Buses via Synchronized Multi-Camera Systems and GPS Integration 査読有り国際誌

Jargal Davaanyam, Obada Al Aama, Tomoki Taniguchi, Hakaru Tamukoh, Hiroaki Wagatsuma

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

A Mathematical Framework for Modeling Local Interactions Between Pedestrians Based on Utility Maximization 査読有り国際誌

Ahmad Altaweel, Kazuhito Mine, Hiroaki Wagatsuma

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

DEVELOPMENT OF METAMATERIAL BASED ACTIVE COMPLIANT KNEE SUPPORT FOR KNEE ORTHOSIS 査読有り国際誌

Raushan Kumar, Vartika Narayani Srinet, Subhadeep Sahana, Malik Arsala Nissar, Ruchira Kumar Pradhan, Shintaro Kasai, Choisuren Purevdorj, Yiqian Ge, Hiroaki Wagatsuma, Bishakh Bhattacharya

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

EEG-Based Analysis using Event-Related Synchronization and Desynchronization in Playing a Strategic Board Game 査読有り国際誌

Kosei Shibata, Yang Yide, Kato Rena, Hendry F. Chame, Laurent Bougrain, Hiroaki Wagatsuma

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

A Behavioral Analysis of the Two-Player "Look This Way!" Game by Using Simultaneous Measurements of EEG, Motion and Gaze 査読有り国際誌

Kato Rena, Kosei Shibata, Yang Yide, Masayuki Fujiwara, Laurent Bougrain, Hiroaki Wagatsuma

Proceedings of the 19th International Conference on Innovative Computing, Information and Control (ICICIC2025) 2025年01月

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