慶應義塾研究者情報データベース

論文 【 表示 ／ 非表示 】

論文 【 表示 ／ 非表示 】

• Pneumatic Laser Origami Rapid and Large-Scale Fabrication of Laser-Welded Pouch Motors for Shape-Changing Products

  Oka S., Koyama K., Gondo T., Ikeda Y., Kawahara Y., Narumi K.

  Proceedings of the 19th International Conference on Tangible, Embedded, and Embodied Interaction, TEI 2025 2025年03月

  　概要を見る

  We propose Pneumatic Laser Origami, a method to rapidly design and fabricate lightweight, self-foldable origami artifacts driven by planar pneumatic actuators called Pouch Motors [18]. Compared to prior methods of building Pouch Motors with customized equipment, we developed a technique to weld two thermoplastic sheets with an off-the-shelf, non-customized laser cutter. This resulted in (1) democratized, (2) faster (> 13 times faster compared to prior methods), and (3) large-scale (85 cm length at maximum) fabrication of shape-changing products. Also, we achieved a method to linearly control the maximum folding angle of Pouch Motors (0◦ < 6 < 95.3◦) by welding extra protrusion patterns, which contributed to driving multiple Pouch Motors with one pneumatic input. To leverage these benefits, we developed the software that takes the target 3D mesh as input and inversely generates a 2D welding pattern for Pouch Motors. Finally, we demonstrated several design examples and applications using our method.

  • Access to Document (DOI)

• Pneumatic Laser Origami: Rapid and Large-Scale Fabrication of Laser-Welded Pouch Motors for Shape-Changing Products

  S Oka, K Koyama, T Gondo, Y Ikeda, Y Kawahara, K Narumi

  Proceedings of the Nineteenth International Conference on Tangible, Embedded … 2025年

• ARAP-Based Shape Editing to Manipulate the Center of Mass

  Hirata S., Noma Y., Narumi K., Kawahara Y.

  Proceedings - SIGGRAPH Asia 2024 Posters, SA 2024 2024年12月

  　概要を見る

  We propose an algorithm to align the center of mass of an input shape to a prescribed point. Unlike previous approaches that rely on hollowing the inner structure, our method deforms the outer shape by incorporating As-Rigid-As-Possible (ARAP) energy. Our method provides two editing modes: one prioritizing speed and the other focusing on accuracy. Combining these two modes, users can interactively explore the design space of shapes while achieving the desired center of mass positioning.

  • Access to Document (DOI)

• Micro-Gesture Recognition of Tongue via Bone Conduction Sound

  Tomaru S., Takaki K., Murakami H., Kim D., Narumi K., Kamezaki M., Kawahara Y.

  UIST Adjunct 2024 - Proceedings of the 37th Annual ACM Symposium on User Interface Software and Technology 2024年10月

  　概要を見る

  We propose a hands-free and less perceptible gesture sensing method of the tongue by capturing the bone conduction sound generated when the tongue rubs the teeth. The sound is captured by the bone conduction microphones attached behind the ears. In this work, we show that tongue slide, snap, and teeth click gestures can be classified using the decision tree algorithm, which focuses on the characteristics in the sound spectrogram. We conducted a preliminary experiment to verify that input methods for mouth microgesture devices using bone conduction can be expanded from only teeth to teeth and tongue gestures without any additional obtrusive sensors. The evaluation revealed that our method achieved a classification accuracy of 82.7% with user-specific parameter adjustment.

  • Access to Document (DOI)

• Computational Design and Fabrication of 3D Printed Zippers Connecting 3D Textile Structures

  Masuda R., Noma Y., Narumi K.

  UIST Adjunct 2024 - Proceedings of the 37th Annual ACM Symposium on User Interface Software and Technology 2024年10月

  　概要を見る

  Zippers have long been used for connecting and disconnecting two textiles repeatedly and easily. However, many industrial zippers cannot retain their shape after assembly, limiting the potential use of connecting soft textiles to form 3D shapes with large and various curvatures. Thus, we present a method to design and fabricate interlocking 3D printable zippers that can encode post-assembly shapes. The user first gives a target 3D shape divided into developable patches (i.e., curved surfaces unrollable like paper). Then, our design software built on Rhino/Grasshopper computes an interlocking zipper on the boundary curve of the patches. The user 3D prints the zipper in a flat state and welds it to the edge of the textiles by thermal bonding, which can zip into a target 3D shape. In this demo, we report our method and exhibit design examples of 3D printed zippers.

  • Access to Document (DOI)

全件表示 >>

総説・解説等 【 表示 ／ 非表示 】

総説・解説等 【 表示 ／ 非表示 】

• Laser Pouch Motors: Selective and Wireless Activation of Soft Actuators by Laser-Powered Liquid-to-Gas Phase Change

  Takefumi Hiraki and Kenichi Nakahara and Koya Narumi and Ryuma Niiyama and Noriaki Kida and Naoki Takamura and Hiroshi Okamoto and Yoshihiro Kawahara

  IEEE Robotics and Automation Letters （Institute of Electrical and Electronics Engineers ({IEEE})）  5 （ 3 ） 4180 - 4187 2020年07月

  • Access to Document (DOI)

• Liquid Pouch Motors: Printable Planar Actuators Driven by Liquid-to-Gas Phase Change for Shape-Changing Interfaces

  Koya Narumi and Hiroki Sato and Kenichi Nakahara and Young ah Seong and Kunihiko Morinaga and Yasuaki Kakehi and Ryuma Niiyama and Yoshihiro Kawahara

  IEEE Robotics and Automation Letters （Institute of Electrical and Electronics Engineers ({IEEE})）  5 （ 3 ） 3915 - 3922 2020年07月

  • Access to Document (DOI)

競争的研究費の研究課題 【 表示 ／ 非表示 】

競争的研究費の研究課題 【 表示 ／ 非表示 】

• ジャカード織機を用いた機能性テキスタイルの計算製造とインタラクション

  2025年04月

  -

  2028年03月

  鳴海 紘也, 基盤研究(A), 補助金,  研究代表者

• 機能性と製造性をつなぐ自己折り技術

  2024年04月

  -

  2027年03月

  鳴海 紘也, 学術変革領域研究(B), 補助金,  研究代表者

担当授業科目 【 表示 ／ 非表示 】

担当授業科目 【 表示 ／ 非表示 】

• 開放環境科学特別研究第１

  2026年度

• 人間・社会システム情報科学博士研究

  2026年度

• コンピュテーショナルファブリケーション

  2026年度

• プログラミング基礎同演習

  2026年度

• 在外国際活動Ⅲ

  2026年度

全件表示 >>