KEIO RESEARCHERS INFORMATION SYSTEM

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Weaving and Disguising Infrared Markers toward Invisible Textile Interaction

   2026.04

  • Access to Document (DOI)

• Zip-up Print: Rapid and Assemblable 3D printing Using 2D Flattened Zipper-like Structures

   2026.04

  • Access to Document (DOI)

• Id tag and detecting system

  T IIZUKA, G ITAMI, N KOSAKA, M Maruyama, T Tanaka, A Koyama, J Kato, ...

  US Patent App. 18/850,301  2026

• GadJets: Air-Jet-Actuated Passive Materials and Mechanisms for Actuated and Shape-Changing Interfaces

  S Oka, WY Yang, Y Zou, M Fukuoka, K Narumi, Y Kakehi, K Nakagaki

  Proceedings of the Twentieth International Conference on Tangible, Embedded …  2026

  • Access to Document (DOI)

• 4D Leaf Circuits

  Nakaya Y., Fujino K., He L., Narumi K.

  Proceedings Scf 2025 10th ACM Symposium on Computational Fabrication  2025.11

  　View Summary

  Most of the electric and electronic circuits around us are flat, and ap plying themtodiverse 3Dsurfaces is challenging. This is because (1) printed circuit boards (PCBs) are generally non-stretchable and can not fit doubly curved surfaces, and (2) folding PCBs into non-planar origami geometries requires enormous time and manual effort. To overcome these limitations, we propose 4D Leaf Circuits, a method to automatically fold complex 3D circuits solely through inkjet printing and conductive leaf transfer. We extended the existing 4D printing method using an inkjet printer and added a primer ink layer. This layer worksasanadhesiveforconductiveleaftransferon selected surface areas. Different from previous work on 4D printed circuits, our method does not require an additional screen printing process of conductive ink or any other modification to the printer, which contributes to faster and easier fabrication of 3D objects with circuits. To identify the materials with robust mechanical and electrical properties, we investigated multiple heat-shrinkable films for shape change and conductive leaves for circuits. We also devel oped an algorithm that generates optimal circuit layouts, avoiding mountain folds and minimizing path length. To demonstrate the feasibility of our method, we built three design examples of an in teractive touch-sensing toy, a custom-made mouse, and a portable glow bangle reacting to the user's motion.

  • Access to Document (DOI)

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Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• 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 2020.07

  • 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 2020.07

  • Access to Document (DOI)

Research Projects of Competitive Funds, etc. 【 Display / hide 】

Research Projects of Competitive Funds, etc. 【 Display / hide 】

• 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

  2025.04

  -

  2028.03

  基盤研究(A), Principal investigator

• 機能性と製造性をつなぐ自己折り技術

  2024.04

  -

  2027.03

  学術変革領域研究(B), Principal investigator

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• GRADUATE RESEARCH ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS 1

  2026

• DOCTORAL RESEARCH ON INFORMATICS, MANAGEMENT, AND HUMAN SCIENCES

  2026

• COMPUTATIONAL FABRICATION

  2026

• INTRODUCTION TO COMPUTER PROGRAMMING(LECTURE AND EXERCISE)

  2026

• INTERNATIONAL INITIATIVE OVERSEAS 3

  2026

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