Shinichi Hirai

Ritsumeikan University: Robotics Research Center

Shinichi Hirai

This paper describes the Robotics Research Center at Ritsumeikan University. The center was established in 1994, following the opening of the Biwako–Kusatsu Campus of Ritsumeikan University. The Robotics Research Center aims at “society-driven, needs-based” research to solve problems in industry and society, …

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Development and Evaluation of An Unplugged Robotic Gripper Based on 4D Printed Hydrogel

Zhe Qiu, Yitong Xue, Kusuma Betha Cahaya Imani, Hidemitsu Furukawa et autres

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Inverse design framework for 4D printed structures using the finite element method

Zaiyang Liu, Kusuma Betha Cahaya Imani, Mengtao Wang, Shugen Ma et autres

In this paper, we present an inverse design framework based on the finite element method (FEM) tailored for 4D printed structures capable of undergoing programmable, stimulus-responsive shape transformations over time. In contrast to conventional forward simulations, which predict deformation from a given …

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Probing simulator capable of independently measuring probing force and resting force

Takahiro Matsuno, Atsushi Mitani, Shinichi Hirai

In periodontal examinations, precise probing force and effective stabilization of the probe are critical skills for practitioners. The ability to insert the probe with an appropriate force highlights the importance of comprehensive skill training. To address this need, we designed and developed …

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Current state and future perspectives on robotic technology for improving efficiency of nursing care

Tetsuyou Watanabe, Jianchun Li, Maya Grace Torii, Yuka Miura et autres

This paper surveyed recent advancements in robotic technologies aimed at enhancing the efficiency of nursing care. Given the extensive scope of nursing care, this paper focuses on dressing support, a critical component of activities of daily living, with highly practical relevance. Additionally, …

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Special Issue on Technology for Food Handling Automation

Kazuyoshi Wada, Shinichi Hirai, Kensuke Harada, Máximo A. Roa et autres

Today, automation in the food industry is attracting attention as an area for the social implementation of human-collaborative robots. While many processes in food production are being automated by...

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Special issue on nursing robotics (Part I)

Tetsuyou Watanabe, Jianchun Li, Gojiro Nakagami, Misako Dai et autres

We are pleased to announce the special issue on Nursing Robotics.Japan, one of the most rapidly aging countries in the world, is projected to see its proportion of older adults (people aged 65 and ...

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ROS2-based robot system with quantitative granular food handling using a regression coefficient estimation-based deep learning model

Yoshiki Mori, Hiroki Fukada, Emika Kameda, Wenjie Shen et autres

In food processing environments, robot systems have gained attention as a solution to labor shortages and the need for consistent product quality. In particular, the development of soft robot hands has advanced to enable the safe and efficient handling of delicate food …

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Development and applications of an unplugged robotic actuator based on 4D printed hydrogel

Zhe Qiu, Zaiyang Liu, Yitong Xue, Hidemitsu Furukawa et autres

In this study, we propose a new concept of unplugged actuators based on the four-dimensional (4D) printed hydrogel. Unlike traditional robotic actuators that are powered by electrical and pneumatic energy, the natural energy such as water, light, and temperature, is served as …

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SFEM-4DP: A strain-based finite element model for 4D printing

Zaiyang Liu, Zhe Qiu, Yang Tian, Shugen Ma et autres

Four-dimensional (4D) printing extends three-dimensional (3D) printing by adding a time-based dimension, allowing printed structures to change and adapt over time. This smart behavior is built into smart materials during printing and activated by external stimuli. Unlike 3D-printed static structures, 4D-printed structures …

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A Snap Mechanism Imitating the Thoracic Joint of a Click Beetle

Takahiro Matsuno, Ryuma Niiyama, Shinichi Hirai

In this study, we focused on the thoracic joint of a click beetle and proposed a two-link type snap mechanism. This mechanism mimics the click beetle's principle for storing and releasing elastic energy, and is composed of links, springs, motors, viscoelastic peg, …

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Modeling of Food Shapes with Variations Based on Spherical Harmonics for Food Manipulation Experiments

Sota Katsuno, Zhongkui Wang, Shinichi Hirai

This paper focuses on three-dimensional food samples for food manipulation research. Each shapes of foods are diverse. Even focusing on specific food item, we often find large individual differences in shapes, sizes and mechanical properties. Such variation affects food manipulation. In this …

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