Journal Papers (Refereed)

202620252024202320222021202020192016 - 2018

  1. Ryutaro Kurai, Takefumi Hiraki, Yuichi Hiroi, Yutaro Hirao, Monica Perusquía-Hernandez, Hideaki Uchiyama, and Kiyoshi Kiyokawa, “MetaProxy: Bridging Agents and Environments in Commercial Metaverse Platforms through Remote Intermediary Monitoring,” IEICE Transactions on Information and Systems, 9 pages, 2026.6. (To Appear)
  2. Michikuni Eguchi, Tomohiro Hayase, Yuichi Hiroi, and Takefumi Hiraki, “Cluster Haptic Texture Dataset: Haptic Texture Dataset with Varied Velocity–Direction Sliding Contacts,” Scientific Data, 24 pages, 2026.2. (To Appear) [arXiv]

  1. Yuichi Hiroi, Yuji Hatada, and Takefumi Hiraki, “Cross-Reality Lifestyle: Integrating Physical and Virtual Lives through Multi-Platform Metaverse,” IEEE Pervasive Computing, vol. 24, no. 4, pp. 19–28, 2025.10. [arXiv]
  2. Ryutaro Kurai, Hikari Yanagawa, Yuichi Hiroi, and Takefumi Hiraki, “MetaGadget: An Accessible Framework for IoT Integration into Commercial Metaverse Platforms,” IEEE Pervasive Computing, vol. 24, no. 4, pp. 63–73, 2025.9. [arXiv]
  3. Ryutaro Kurai, Takefumi Hiraki, Yuichi Hiroi, Yutaro Hirao, Monica Perusquia-Hernandez, Hideaki Uchiyama, and Kiyoshi Kiyokawa, “MagicCraft: Natural Language-Driven Generation of Dynamic and Interactive 3D Objects for Commercial Metaverse Platforms,” IEEE Access, vol. 13, pp. 132459–132474, 2025.7. [arXiv]
  4. Michikuni Eguchi, Mai Nishimura, Shigeo Yoshida, and Takefumi Hiraki, “Fluidic Robot Swarm Control for Obstacle-Unaware Navigation,” Advanced Robotics, vol. 39, no. 12, pp. 748–764, 2025.7.
  5. Rinto Tosa, Shingo Hattori, Yuichi Hiroi, Yuta Itoh, and Takefumi Hiraki, “ChromaGazer: Unobtrusive Visual Modulation using Imperceptible Color Vibration for Visual Guidance,” IEEE Transactions on Visualization and Computer Graphics (Proceedings of the 32nd IEEE Conference on Virtual Reality and 3D User Interfaces – IEEE VR 2025), vol. 31, no. 5, pp. 3450–3458, 2025.5. [arXiv]
  6. Ryutaro Kurai, Takefumi Hiraki, Yuichi Hiroi, Yutaro Hirao, Monica Perusquia-Hernandez, Hideaki Uchiyama, and Kiyoshi Kiyokawa, “MagicItem: Dynamic Behavior Design of Virtual Objects with Large Language Models in a Commercial Metaverse Platform,” IEEE Access, vol. 13, pp. 19132–19143, 2025.1. [arXiv]

  1. Rina Nagano, Takahiro Kinoshita, Shingo Hattori, Yuichi Hiroi, Yuta Itoh, and Takefumi Hiraki, “HaptoFloater: Visuo-Haptic Augmented Reality by Embedding Imperceptible Color Vibration Signals for Tactile Display Control in a Mid-Air Image,” IEEE Transactions on Visualization and Computer Graphics (Proceedings of the 23rd IEEE International Symposium on Mixed and Augmented Reality – ISMAR 2024), vol. 30, no. 11, pp. 7463–7472, 2024.11.
  2. Hiroyuki Aso, Hiroki Ishizuka, Takefumi Hiraki, Yasuyo Minagawa, and Norihisa Miki, “Relationship Between Interoceptive Accuracy and Tactile Exploration Behavior,” IEEE Access, vol. 12, pp. 93145–93151, 2024.7.
  3. Seiichi Yamamoto, Hiroki Ishizuka, Takefumi Hiraki, Sei Ikeda, and Osamu Oshiro, “Strain Sensorization of a Bladder of Expanding Pouch Actuator Using Liquid Metal,” Sensors and Materials, vol. 36, no. 6(1), pp. 2209–2224, 2024.6.
  4. Yuichi Hiroi, Takefumi Hiraki, and Yuta Itoh, “StainedSweeper: Compact, Variable-Intensity Light-Attenuation Display with Sweeping Tunable Retarders,” IEEE Transactions on Visualization and Computer Graphics (Proceedings of the 31st IEEE Conference on Virtual Reality and 3D User Interfaces – IEEE VR 2024), vol. 30, no. 5, pp. 2682–2692, 2024.5.

  1. Kosuke Hiratani, Daisuke Iwai, Yuta Kageyama, Parinya Punpongsanon, Takefumi Hiraki, and Kosuke Sato, “Shadowless Projection Mapping using Retrotransmissive Optics,” IEEE Transactions on Visualization and Computer Graphics (Proceedings of the 30th IEEE Conference on Virtual Reality and 3D User Interfaces – IEEE VR 2023), vol. 29, no. 5, pp. 2280–2290, 2023.5.
  2. Yamato Miyatake, Takefumi Hiraki, Daisuke Iwai, and Kosuke Sato, “HaptoMapping: Visuo-Haptic Augmented Reality by Embedding User-Imperceptible Tactile Display Control Signals in a Projected Image,” IEEE Transactions on Visualization and Computer Graphics (Proceedings of the 29th IEEE Conference on Virtual Reality and 3D User Interfaces – IEEE VR 2022), vol. 29, no. 4, pp. 2005–2019, 2023.4.
  3. Seiya Yamaguchi, Natsumi Nakano, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “ProtoHand: Solderless Prototyping of Electrical Circuits on a Soft Artificial Hand with Liquid Metal,” IEEE Sensors Letters, vol. 7, no. 3, pp. 6001404:1–4, 2023.3.
  4. Seiya Yamaguchi, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “Handshake Feedback in a Haptic Glove Using Pouch Actuators,” Actuators, vol. 12, no. 2, pp. 51:1–15, 2023.1.

  1. Shuto Yamanaka, Tatsuho Nagatomo, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “Machine-Learning-Based Fine Tuning of Input Signals for Mechano-Tactile Display,” Sensors, vol. 22, no. 14, pp. 5299:1–14, 2022.7.
  2. Ryusei Uramune, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, “HaPouch: A Miniaturized, Soft, and Wearable Haptic Display Device Using a Liquid-to-gas Phase Change Actuator,” IEEE Access, vol. 10, pp. 16830–16842, 2022.1.

  1. Tatsuho Nagatomo, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “Unsupervised Learning Enables Extraction of Tactile Information from Text Database,” IEEE Access, vol. 11, pp. 101155–101166, 2021.11.
  2. Kohei Morita, Takefumi Hiraki, Haruka Matsukura, Daisuke Iwai, and Kosuke Sato, “Head Orientation Control of Projection Area for Projected Virtual Hand Interface on Wheelchair,” SICE Journal of Control, Measurement, and System Integration, vol. 14, no. 1, pp. 223–232, 2021.8.
  3. Seiya Hirai, Tatsuho Nagatomo, Takefumi Hiraki, Hiroki Ishizuka, Yoshihiro Kawahara, and Norihisa Miki, “Micro Elastic Pouch Motors: Elastically Deformable and Miniaturized Soft Actuators Using Liquid-to-Gas Phase Change,” IEEE Robotics and Automation Letters (Proceedings of the 4th IEEE International Conference on Soft Robotics – RoboSoft 2021), vol. 6, no. 3, pp. 5373–5380, 2021.4.
  4. Tatsuya Usui, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, “Fully Flexible Liquid-to-gas Phase Change Actuators with Integrated Liquid Metal Heaters,” Japanese Journal of Applied Physics, vol. 60, pp. SCCL11:1–10, 2021.3.

  1. Yushi Sato, Takefumi Hiraki, Naruki Tanabe, Haruka Matsukura, Daisuke Iwai, and Kosuke Sato, “Modifying Texture Perception With Pseudo-Haptic Feedback for a Projected Virtual Hand Interface,” IEEE Access, vol. 8, pp. 120473–120488, 2020.7.
  2. Satoshi Abe, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Imperceptible Color Vibration for Screen–Camera Communication via 2D Binary Pattern,” ITE Transactions on Media Technology and Applications, vol. 8, no. 3, pp. 170–185, 2020.7.
  3. Takefumi Hiraki, Yoshihiro Kawahara, and Takeshi Naemura, “Projection-based Control for Mobile Robots Cooperating with Displayed Images,” Transactions on the Virtual Reality Society of Japan, vol. 25, no. 2, pp. 148–157, 2020.6. (In Japanese)
  4. Takefumi Hiraki*, Kenichi Nakahara*, Koya Narumi*, Ryuma Niiyama, Noriaki Kida, Naoki Takamura, Hiroshi Okamoto, and Yoshihiro Kawahara, “Laser Pouch Motors: Selective and Wireless Activation of Soft Actuators by Laser-powered Liquid-to-gas Phase Change,” IEEE Robotics and Automation Letters (Proceedings of the 3rd IEEE International Conference on Soft Robotics – RoboSoft 2020), vol. 5, no. 3, pp. 4180–4187, 2020.3. (* These authors contributed equally.)
  5. Tatsuyuki Ueda, Daisuke Iwai, Takefumi Hiraki, and Kosuke Sato, “IlluminatedFocus: Vision Augmentation using Spatial Defocusing via Focal Sweep Eyeglasses and High-Speed Projection,” IEEE Transactions on Visualization and Computer Graphics (Proceedings of the 27th IEEE Conference on Virtual Reality and 3D User Interfaces – IEEE VR 2020), vol. 25, no. 5, pp. 2051–2061, 2020.3. [arXiv]

  1. Ikuo Kamei, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “PILC Projector: Image Projection With Pixel-level Infrared Light Communication,” IEEE Access, vol. 7, pp. 160768–160778, 2019.10.
  2. Takefumi Hiraki, Shogo Fukushima, Hiroshi Watase, and Takeshi Naemura, “Dynamic PVLC: Pixel-level Visible Light Communication Projector with Interactive Update of Images and Data,” ITE Transactions on Media Technology and Applications, vol. 7, no. 4, pp. 160–168, 2019.10.
  3. Akira Matsumoto, Satoshi Abe, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Imperceptible AR Markers for Near-screen Mobile Interaction,” IEEE Access, vol. 7, pp. 79927–79933, 2019.6.

  1. Takefumi Hiraki, Shogo Fukushima, Yoshihiro Kawahara, and Takeshi Naemura, “Phygital Field: An Integrated Field with Physical Robots and Digital Images using Projection-based Localization and Control Method,” SICE Journal of Control, Measurement, and System Integration, vol. 11, no. 4, pp. 302–311, 2018.7.
  2. Takefumi Hiraki, Mika Koizumi, Leijie Zhou, Shogo Fukushima, and Takeshi Naemura, “Reconfigurable Pixel-level Visible Light Communication with Light Source Control,” Transactions on the Virtual Reality Society of Japan, vol. 21, no. 1, pp. 197–206, 2016.3. (In Japanese)

Review Articles (Invited)

  1. Takefumi Hiraki, “Visual and Haptic Media Technology Using Pixel-Level Visible Light Communication Projector,” Japanese Journal of Optics, vol. 52, no. 1, pp. 23–29, 2023.1. (in Japanese)
  2. Satoshi Abe, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Imperceptible QR Code on Display Using Image Color Vibration,” Image Laboratory, vol. 32, no. 3, pp. 45–51, 2021.3. (in Japanese)

International Conferences – Oral (Refereed)

202620252024202120202016 - 2018

  1. Satomi Tokida, Yong-Hao Hu, Yuta Itoh, Jean-Marie Normand, Rebecca Fribourg, Jean-Philippe Riviere, Yuichi Hiroi, Takefumi Hiraki, and Yoshio Ishiguro, “ImmersiveDMT: A VR System for Expressive Body Movement and Stress Reduction through Dance Movement Therapy,” Proceedings of the 33rd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2026), 11 pages, 2026.3. (To Appear)
  2. Kazuki Yamaura, Hiroki Ishizuka, and Takefumi Hiraki, “Laser HaPouch: Modeling and Implementation of Laser-driven Liquid-to-gas Phase Change Actuator Arrays for Haptic Displays,” Proceedings of the 2026 IEEE/SICE International Symposium on System Integration (SII 2026), pp. 1–8, 2026.1.
  3. Yuichi Hiroi, Yuki Imai, Hikari Yanagawa, and Takefumi Hiraki, “Large-scale, Longitudinal Field Study of AI-agent-User Interactions in Commercial Metaverse,” Proceedings of the 8th IEEE International Conference on Artificial Intelligence and eXtended and Virtual Reality (AIxVR 2026), pp. 1–8, 2026.1.

  1. Takefumi Hiraki, “Imperceptible Augmentation: Unobtrusive Information Embedding and Visual Guidance in Augmented Reality,” Proceedings of the 32nd International Display Workshops (IDW 2025), pp. 1–4, 2025.12.
  2. Masahiro Nara, Ryusuke Miyazaki, Yuichi Hiroi ,Takefumi Hiraki, Yuta Itoh, and Shio Miyafuji, “Saccaidance: Saccade-Aware Pattern Embedding for Gaze Guidance on High-Speed Displays,” Proceedings of the 31st ACM Symposium on Virtual Reality Software and Technology (VRST 2025), pp. 1–11, 2025.11.
  3. Hikari Yanagawa, Yuichi Hiroi, Satomi Tokida, Yuji Hatada, and Takefumi Hiraki, “Navigation Pixie: Implementation and Empirical Study Toward On-demand Navigation Agents in Commercial Metaverse,” Proceedings of the 24th IEEE International Symposium on Mixed and Augmented Reality (ISMAR 2025), pp. 1–11, 2025.10. [arXiv]
  4. Masanori Ibara, Yuichi Hiroi, Takushi Kamegai, and Takefumi Hiraki, “Implementation and Application of Multi-Format 3D Data Integration in a Cross-Device Commercial Metaverse Platform,” Proceedings of the 2nd IEEE International Symposium on Emerging Metaverse (ISEMV 2025), pp. 1–9, 2025.10.
  5. Hiroto Tsutsui, Takefumi Hiraki, Yuichi Hiroi, and Shoichi Hasegawa, “Community Analysis of Social Virtual Reality Based on Large-Scale Log Data of a Commercial Metaverse Platform,” Proceedings of the 2nd IEEE International Symposium on Emerging Metaverse (ISEMV 2025), pp. 1–9, 2025.10.
  6. Masanori Ibara, Yuichi Hiroi, Takushi Kamegai, Yusuke Masubuchi, Kazuki Matsutani, Megumi Zaizen, Junya Morita, and Takefumi Hiraki, “Weather Synchronization in Digital Twin Environments for Shared VR Experience Using Commercial Metaverse Platforms,” Proceedings of the 2nd IEEE International Symposium on Emerging Metaverse (ISEMV 2025), pp. 1–4, 2025.10.
  7. Youfang Shen, Rinto Tosa, Yuji Hatada, Yuichi Hiroi, Takefumi Hiraki, and Takeshi Naemura, “ChromaGazer-HMD: Visual Modulation using Unobtrusive Color Vibration for Gaze Guidance with Head-Mounted Displays,” Proceedings of the 2025 Augmented Humans International Conference (AHs 2025), pp. 43–54, 2025.3.

  1. Keitaro Ihara, Atsuya Baba, Hiroki Ishizuka, Takefumi Hiraki, and Osamu Oshiro, “A Soft Vibrotactile Display Using Sound Speakers,” Proceedings of the 6th International Conference, AsiaHaptics 2024 (AsiaHaptics 2024), pp. B20:1–4, 2024.10. [arXiv]
  2. Yuichi Hiroi, Takefumi Hiraki, and Yuta Itoh, “FactoredSweeper: Optical See-Through Display Integrating Light Attenuation and Addition with Single Spatial Light Modulator,” Proceedings of the 23rd IEEE International Symposium on Mixed and Augmented Reality (ISMAR 2024), pp. 1–10, 2024.10.
  3. Michikuni Eguchi, Mai Nishimura, Shigeo Yoshida, and Takefumi Hiraki, “Robot Swarm Control Based on Smoothed Particle Hydrodynamics for Obstacle-Unaware Navigation,” Proceedings of the 2024 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2024), pp. 9006–9013, 2024.10.
  4. Sosuke Ichihashi, So Kuroki, Mai Nishimura, Kazumi Kasaura, Takefumi Hiraki, Kazutoshi Tanaka, and Shigeo Yoshida, “Swarm Body: Embodied Swarm Robots,” Proceedings of the 2024 ACM Conference on Human Factors in Computing Systems (CHI 2024), pp. 267:1–19, 2024.5.

  1. Yuri Mikawa, Masahiro Fujiwara, Takefumi Hiraki, Yasutoshi Makino, and Hiroyuki Shinoda, “Far-field Aerial Image Presentation of One Point by a Laser Source using Beam Scanning by Two-axis Galvanometer Mirror,” Proceedings of the 60th Annual Conference of the Society of Instrument and Control Engineers (SICE 2021), pp. 137–143, 2021.9.

  1. Tatsuya Usui, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, “Miniaturized Liquid Pouch Motors Using Flexible Liquid Metal Heater,” Proceedings of the 33rd International Microprocesses and Nanotechnology Conference (MNC 2020), pp. 5-26:1–2, 2020.11.
  2. Liyuan Duan, Haruka Matsukura, Parinya Punpongsanon, Takefumi Hiraki, Daisuke Iwai, and Kosuke Sato, “Adaptive Visualization of Gas Distribution Using Augmented Reality Glasses,” Proceedings of the 9th IEEE Global Conference on Consumer Electronics (GCCE 2020), pp. 585–586, 2020.10.
  3. Kohei Morita, Takefumi Hiraki, Haruka Matsukura, Daisuke Iwai, and Kosuke Sato, “Extension of Projection Area using Head Orientation in Projected Virtual Hand Interface for Wheelchair Users,” Proceedings of the 59th Annual Conference of the Society of Instrument and Control Engineers (SICE 2020), pp. 421–426, 2020.9.
  4. Yamato Miyatake, Takefumi Hiraki, Tomosuke Maeda, Daisuke Iwai, and Kosuke Sato, “Visuo-Haptic Display by Embedding Imperceptible Spatial Haptic Information into Projected Images,” Haptics: Science, Technology, Applications (Proceedings of the 12th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications – EuroHaptics 2020), Lecture Notes in Computer Science, vol. 12272, pp. 226–234, 2020.9.

  1. Takefumi Hiraki, Shogo Fukushima, Hiroshi Watase, and Takeshi Naemura, “Pixel-level Visible Light Communication Projector with Interactive Update of Images and Data,” Proceedings of the 25th International Display Workshops (IDW 2018), pp. 1192–1195, 2018.12.
  2. Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Projection-based Localization and Navigation Method for Multiple Mobile Robots with Pixel-level Visible Light Communication,” Proceedings of the 2016 IEEE/SICE International Symposium on System Integration (SII 2016), pp. 862–868, 2016.12.
  3. Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Sensible Shadow: Tactile Feedback from Your Own Shadow,” Proceedings of the 7th Augmented Human International Conference (AH 2016), pp. 23:1–4, 2016.2.

International Conferences – Poster, Demo, Workshop (Refereed)

202620252024202320222021202020192015 - 2018

  1. Gauthier Bertram*, Takefumi Hiraki*, Yuichi Hiroi, Etienne Peillard, and Jean-Marie Normand, “Depth Perception in Soft-Edge Occlusion-capable Optical See-through Head-mounted Displays,” Abstracts and Workshops of the 33rd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2026), 8 pages, 2026.3. (* These authors contributed equally.) (To Appear)
  2. Sotaro Yokoi*, Satomi Tokida*, Yuichi Hiroi, and Takefumi Hiraki, “Verselyzer: A Statistical Analysis Interface Enabling Non-Experts to Assess Metaverse Branding Effectiveness,” Abstracts and Workshops of the 33rd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2026), 4 pages, 2026.3. (* These authors contributed equally.) (To Appear)
  3. Satomi Tokida, Yuichi Hiroi, Miyabi Uesugi, Atsushi Shimono, Haruyuki Suzuki, Shouma Abe, Takefumi Hiraki, “Analyzing User Behaviors in Metaverse Brand Events that Drive Real-World Store Visit Intentions,” Abstracts and Workshops of the 33rd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2026), 4 pages, 2026.3. (To Appear)
  4. Akira Kawamura, Takefumi Hiraki, and Kazutoshi Sasahara, “A Quantitative Analysis of Changes in Metaverse Usage Intention as a Third Place Using a Survey with Video Viewing Intervention,” Abstracts and Workshops of the 33rd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2026), 7 pages, 2026.3. (To Appear)

  1. Michikuni Eguchi, Takekazu Kitagishi, Yuichi Hiroi, and Takefumi Hiraki, “Tactile Data Recording System for Clothing with Motion-Controlled Robotic Sliding,” Proceedings of the ACM SIGGRAPH Asia 2025 Posters (SA 2025), pp. 31:1–3, 2025.12.
  2. Ryutaro Kurai, Yuji Hatada, Yuichi Hiroi, and Takefumi Hiraki, “MagicPen: Interactive Sketch-to-3D Generation in Commertial Metaverse Platforms,” Adjunct Proceedings of the 24th IEEE International Symposium on Mixed and Augmented Reality (ISMAR 2025), pp. 602–604, 2025.10.
  3. Atsuya Matsumoto, Hikari Yanagawa, Yuichi Hiroi, Yuji Hatada, Takuji Narumi, and Takefumi Hiraki, “Dynamic Gimmick Learning for Navigation Agents in Social VR Through User-Agent Dialogue,” Adjunct Proceedings of the 24th IEEE International Symposium on Mixed and Augmented Reality (ISMAR 2025), pp. 605–607, 2025.10.
  4. Chun Wei Ooi, Yuichi Hiroi, Takefumi Hiraki, and Yuta Itoh, “RAPHO: A Rapid Occluding Photochromic Based Occlusion-Capable Display,” Adjunct Proceedings of the 24th IEEE International Symposium on Mixed and Augmented Reality (ISMAR 2025), pp. 648–649, 2025.10.
  5. Michikuni Eguchi, Shigeo Yoshida, Mai Nishimura, and Takefumi Hiraki, “FluidicSwarm: Embodiment of Swarm Robots Using Fluid Behavior Imitation,” Proceedings of the ACM SIGGRAPH 2025 Emerging Technologies (SIGGRAPH 2025), pp. 5:1–2, 2025.8.
  6. Ryota Sakuma, Yusuke Sakai, Yoshihiro Kawahara, and Takefumi Hiraki, “Demonstration of Multi-Layered Inflatables: Asymmetric-Shaped Inflatable Structures by Stacked Planar Sheets,” Proceedings of the ACM SIGGRAPH 2025 Emerging Technologies (SIGGRAPH 2025), pp. 3:1–2, 2025.8.
  7. Michikuni Eguchi, Yuichi Hiroi, Tomohiro Hayase, and Takefumi Hiraki, “Cluster Haptic Texture Database: Haptic Texture Database with Controlled Sliding-Contact Interactions,” Adjunct Proceedings of the 2025 IEEE World Haptics Conference (WHC 2025), pp. WP2.09:1–2, 2025.7.
  8. Michikuni Eguchi, Ryota Sakuma, and Takefumi Hiraki, “LaserHaptics: Mid-Air Haptic Feedback via Laser-Induced Cavitation using Low Boiling-Point Liquid,” Adjunct Proceedings of the 2025 IEEE World Haptics Conference (WHC 2025), pp. WP1.22:1–2, 2025.7.
  9. Yusuke Masubuchi*, Takefumi Hiraki*, Yuichi Hiroi, Masanori Ibara, Kazuki Matsutani, Megumi Zaizen, and Junya Morita, “Development of Digital Twin Environment through Integration of Commercial Metaverse Platform and IoT Sensors of Smart Building,” Abstracts and Workshops of the 32nd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2025), pp. 852–855, 2025.3. (* These authors contributed equally.)
  10. Ryutaro Kurai, Takefumi Hiraki, Yuichi Hiroi, Yutaro Hirao, Monica Perusquia-Hernandez, Hideaki Uchiyama, and Kiyoshi Kiyokawa, “An implementation of MagicCraft: Generating Interactive 3D Objects and Their Behaviors from Text for Commercial Metaverse Platforms,” Abstracts and Workshops of the 32nd IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2025), pp. 1284–1285, 2025.3.

  1. Ryutaro Kurai, Yuichi Hiroi, and Takefumi Hiraki, “MetaGadget: IoT Framework for Event-Triggered Integration of User-Developed Devices into Commercial Metaverse Platforms,” Adjunct Proceedings of the 2024 IEEE International Symposium on Mixed and Augmented Reality (ISMAR 2024), pp. 632–633, 2024.10.
  2. Kazuki Yamaura, Hiroki Ishizuka, and Takefumi Hiraki, “LED Pouch Motor: Wireless Actuation of a Colorized Liquid-to-gas Phase Change Actuator Using an Infrared LED,” Proceedings of the 40th Anniversary of the IEEE Conference on Robotics and Automation (ICRA@40), pp. WeINT1S.38:1–2, 2024.9.
  3. Shingo Hattori, Yuichi Hiroi, and Takefumi Hiraki, “Measurement of the Imperceptible Threshold for Color Vibration Pairs Selected by using MacAdam Ellipse,” Proceedings of the ACM SIGGRAPH 2024 Posters (SIGGRAPH 2024), pp. 68:1–2, 2024.7.
  4. Yui Moriyama, Hiroyuki Aso, Hiroki Ishizuka, Takefumi Hiraki, and Norihisa Miki, “Human Perception Characterization Using Generative AI,” Adjunct Proceedings of the 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2024), p. 118292:1, 2024.7.
  5. Ayane Abe, Shunsaku Suzuki, Hiroki Ishizuka, Takefumi Hiraki, and Norihisa Miki, “Innovative Strategy for Resolving Trigger Time Discrepancy in ERP Recording,” Adjunct Proceedings of the 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2024), p. 118422:1, 2024.7.
  6. Ryota Sakuma, Koya Narumi, Yoshihiro Kawahara, and Takefumi Hiraki, “TactPrint: 3D Printing Lattice-based Tactile Displays with Optimized and Localized Vibration,” Proceedings of the 2024 ACM Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA 2024), pp. 422:1–4, 2024.5.
  7. Ryutaro Kurai, Takefumi Hiraki, Yuichi Hiroi, Yutaro Hirao, Monica Perusquia-Hernandez, Hideki Uchiyama, and Kiyoshi Kiyokawa, “Design and Implementation of Agent APIs for Large-scale Social VR Platforms,” Abstracts and Workshops of the 31st IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2024), pp. 584–587, 2024.3.

  1. Hiroyuki Aso, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “Quantitative Analysis of Relation among Finger Scanning Speed, Surface Roughness, and Properties of Tactile Receptors,” Adjunct Proceedings of the 45th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2023), p. T8-PI.We_1500:9:1, 2023.7.
  2. Ryo Ichikawa, Takumi Kawana, Yuki Zenba, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “EEG Measurement Using A Headset with Candle-like Microneedle Electrodes While Walking/Running,” Adjunct Proceedings of 45th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2023), p. T7-PF.Tu_1500:12:1, 2023.7.
  3. Hiroyuki Aso, Takefumi Hiraki, Hiroki Ishizuka, and Norihisa Miki, “Linkage between Free Exploratory Movements and Tactile Receptor Frequency Response,” Adjunct Proceedings of the 2023 IEEE World Haptics Conference (WHC 2023), p. WIP.E2b.3:1, 2023.7.
  4. Kazuki Yamaura and Takefumi Hiraki, “Laser HaPouch: A Haptic Display Utilizing Selective Activation of Laser-powered Liquid-to-gas Phase Change Actuator Arrays,” Adjunct Proceedings of the 2023 IEEE World Haptics Conference (WHC 2023), p. WIP.E1.7:1, 2023.7.

  1. Yuto Umetsu, Parinya Punpongsanon, and Takefumi Hiraki, “InfiniteShader: Color Changeable 3D Printed Objects using Bi-Stable Thermochromic Materials,” Proceedings of the ACM SIGGRAPH Asia 2022 Posters (SA 2022), pp. 38:1–2, 2022.12. [PDF]
  2. Shingo Hattori and Takefumi Hiraki, “Accelerated and Optimized Search of Imperceptible Color Vibration for Embedding Information into LCD images,” Proceedings of the ACM SIGGRAPH Asia 2022 Posters (SA 2022), pp. 16:1–2, 2022.12. [PDF]
  3. Madoka Ito, Ryota Sakuma, Hiroki Ishizuka, and Takefumi Hiraki, “AirHaptics: Vibrotactile Presentation Method using an Airflow from Audio Speakers of Smart Devices,” Proceedings of the 28th ACM Symposium on Virtual Reality Software and Technology (VRST 2022), pp. 39:1–2, 2022.11.

  1. Takefumi Hiraki*, Tomohiro Hayase*, Yuichi Ike*, Takashi Tsuboi, and Michio Yoshiwaki, “Viewpoint Planning of Projector Placement for Spatial Augmented Reality using Star-Kernel Decomposition,” Abstracts and Workshops of the 28th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2021), pp. 583–584, 2021.3. (* These authors contributed equally.)

  1. Ikuo Kamei, Changyo Han, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “CoVR: Co-located Virtual Reality Experience Sharing for Facilitating Joint Attention via Projected View of HMD Users,” Proceedings of the ACM SIGGRAPH Asia 2020 Emerging Technologies (SA 2020), pp. 14:1–2, 2020.12.
  2. Yamato Miyatake, Takefumi Hiraki, Tomosuke Maeda, Daisuke Iwai, and Kosuke Sato, “HaptoMapping: Visuo-Haptic AR System using Projection-based Control of Wearable Haptic Devices,” Proceedings of the ACM SIGGRAPH Asia 2020 Emerging Technologies (SA 2020), pp. 7:1–2, 2020.12.
  3. Rei Kawakami, Ikuo Kamei, Changyo Han, Takefumi Hiraki, Yuzuko Utsumi, Yasuaki Kakehi, and Takeshi Naemura, “OUR Shurijo: Shurijo Castle Digital Reconstruction Project,” International Conference on 3D Vision (3DV 2020), Demos, p. 7:1, 2020.11.
  4. Ryusei Uramune, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, “HaPouch: Soft and Wearable Haptic Display Devices using Liquid-to-gas Phase Change Actuator,” Adjunct Proceedings of the 33rd Annual ACM Symposium on User Interface Software and Technology (UIST 2020), pp. 53–55, 2020.10.
  5. Ryusei Uramune, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, “Demonstration of Inflatable Soft Haptic Device using Liquid-to-gas Phase Change Actuator,” The 12th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications (EuroHaptics 2020), Demos, 202, 2020.9.
  6. Ryusei Uramune, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, “Inflatable Soft Haptic Device using Liquid-to-gas Phase Change Actuator,” The 12th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications (EuroHaptics 2020), Work in Progress, 201, 2020.9.

  1. Takefumi Hiraki, Shogo Fukushima, Yoshihiro Kawahara, and Takeshi Naemura, “NavigaTorch: Projection-based Robot Control Interface using High-speed Handheld Projector,” Proceedings of the ACM SIGGRAPH Asia 2019 Emerging Technologies (SA 2019), pp. 31–33, 2019.11.
  2. Yushi Sato, Naruki Tanabe, Kohei Morita, Takefumi Hiraki, Parinya Punpongsanon, Haruka Matsukura, Daisuke Iwai, and Kosuke Sato, “Pseudo-Haptic Feedback in a Projected Virtual Hand for Tactile Perception of Textures,” The 2019 IEEE World Haptics Conference (WHC 2019), Hands-on Demos, DM2.09, 2019.7.
  3. Yushi Sato, Naruki Tanabe, Kohei Morita, Takefumi Hiraki, Parinya Punpongsanon, Haruka Matsukura, Daisuke Iwai, and Kosuke Sato, “Pseudo-Haptic Feedback in a Projected Virtual Hand for Tactile Perception of Textures,” Adjunct Proceedings of the 2019 IEEE World Haptics Conference (WHC 2019), pp. WP1P.09:1–2, 2019.7.
  4. Ikuo Kamei, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “PILC Projector: RGB-IR Projector for Pixel-level Infrared Light Communication,” Proceedings of the 26th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR 2019), pp. 1004–1005, 2019.3.

  1. Takefumi Hiraki, Masaaki Fukumoto, and Yoshihiro Kawahara, “Touchable Wall: Easy-to-Install Touch-Operated Large-Screen Projection System,” Proceedings of the 2018 ACM International Conference on Interactive Surfaces and Spaces (ISS 2018), pp. 465–468, 2018.11.
  2. Satoshi Abe, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Screen–Camera Communication via Matrix Barcode Utilizing Imperceptible Color Vibration,” Adjunct Proceedings of the 31st Annual ACM Symposium on User Interface Software and Technology (UIST 2018), pp. 166–168, 2018.10.
  3. Takefumi Hiraki, Yoshihiro Kawahara, and Takeshi Naemura, “Projection-based Localization and Control Method of Robot Swarms for Swarm User Interfaces,” Proceedings of the 2018 ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp 2018), pp. 584–589, 2018.10.
  4. Satoshi Abe, Atsuro Arami, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Imperceptible Color Vibration for Embedding Pixel-by-Pixel Data into LCD Images,” Proceedings of the 2017 ACM Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA 2017), pp. 1464–1470, 2017.5.
  5. Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, “Phygital Field: an Integrated Field with a Swarm of Physical Robots and Digital Images,” Proceedings of the ACM SIGGRAPH Asia 2016 Emerging Technologies (SA 2016), pp. 2:1–2, 2016.12.
  6. Takefumi Hiraki*, Koya Narumi*, Koji Yatani, and Yoshihiro Kawahara, “Phones on Wheels: Exploring Interaction for Smartphones with Kinetic Capabilities,” Adjunct Proceedings of the 29th Annual ACM Symposium on User Interface Software and Technology (UIST 2016), pp. 121–122, 2016.10. (* These authors contributed equally.)
  7. Takefumi Hiraki, Yasuaki Kakehi, and Yoshihiro Kawahara, “Basic Estimation of Internal Power Harvesting in the Mouth Cavity,” Adjunct Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp 2016), pp. 954–957, 2016.9.
  8. Takefumi Hiraki, Issei Takahashi, Shotaro Goto, Shogo Fukushima, and Takeshi Naemura, “Phygital Field: Integrated Field with Visible Images and Robot Swarm Controlled by Invisible Images,” Proceedings of the ACM SIGGRAPH 2015 Posters (SIGGRAPH 2015), p. 85:1, 2015.8.

Invited Talks

  1. Takefumi Hiraki, “Latest Trends of Large-scale Metaverse Platforms and Perspectives on Standardization,” The 1st International Workshop on Standardization in XR (XRStand 2025), 2025.10.
  2. Takefumi Hiraki, “Latest Trends of Metaverse Platforms and Perspectives on Standardization,” The 37th APT Standardization Program Forum (ASTAP-37), 2025.4.
  3. Takefumi Hiraki, “Latest Trends of Metaverse Platforms from the Viewpoint of Cluster,” ITU Workshop on “Standardization and innovation for multimedia and cable TV ecosystems”, 2024.9.
  4. Takefumi Hiraki, “Latest Trends of Metaverse Platforms from the Viewpoint of Cluster,” TTA-TTC Collaborative workshop on next-generation experts and key ICT issues (AI/Metaverse), 2024.6.
  5. Takefumi Hiraki, “Phygital = Physical + Digital: Toward the realization of Reality-augmentation media that support people and enrich reality,” Seminar, Design++ research center, ETH Zurich, 2023.3.

Awards

  1. Hiroto Tsutsui, Takefumi Hiraki, Yuichi Hiroi, and Shoichi Hasegawa, Best Paper Award, IEEE ISEMV 2025, “Community Analysis of Social Virtual Reality Based on Large-Scale Log Data of a Commercial Metaverse Platform,” 2025.10.
  2. Youfang Shen, Rinto Tosa, Yuji Hatada, Yuichi Hiroi, Takefumi Hiraki, and Takeshi Naemura, Interactive Presentation Award (PC nomination), Interaction 2025, “Visual Guidance by Unobtrusive Binocular Complementary Color Vibration to Support Exploratory Behavior of HMD Users,” 2025.3.
  3. Kazuki Yamaura, Hiroki Ishizuka, and Takefumi Hiraki, Outstanding Presentation Award, SICE SI 2024, “LED Pouch Motor: Wavelength-selective Wireless Actuation by Dyeing of Liquid-to-gas Phase Change Actuator,” 2025.2.
  4. Shingo Hattori, First Place, ACM SIGGRAPH 2024 Student Research Competition for undergraduate work, “Accelerated and Optimized Search of Imperceptible Color Vibration for Embedding Information into LCD images,” 2024.8.
  5. Sosuke Ichihashi, So Kuroki, Mai Nishimura, Kazumi Kasaura, Takefumi Hiraki, Kazutoshi Tanaka, and Shigeo Yoshida, Interactivity Popular Choice Honorable Mention, ACM CHI 2024, “Swarm Body: Embodied Swarm Robots,” 2024.5.
  6. Liyuan Duan, Haruka Matsukura, Parinya Punpongsanon, Takefumi Hiraki, Daisuke Iwai, and Kosuke Sato, Excellent Student Paper Award, Bronze Prize, IEEE GCCE 2020, “Adaptive Visualization of Gas Distribution Using Augmented Reality Glasses,” 2020.10.
  7. Ryusei Uramune, Hiroki Ishizuka, Takefumi Hiraki, Yoshihiro Kawahara, Sei Ikeda, and Osamu Oshiro, Top-3 for Best Poster Award, EuroHaptics 2020, “Inflatable Soft Haptic Device using Liquid-to-gas Phase Change Actuator,” 2020.9.
  8. Akira Watanabe, Takefumi Hiraki, Daisuke Iwai, and Kosuke Sato, Kansai-section Joint Convention of Institutes of Electrical Engineering Incentive Award, “Virtual Calligraphy Performance Experience with a Large Screen,” 2020.1.
  9. Takefumi Hiraki, Shogo Fukushima, Yoshihiro Kawahara, and Takeshi Naemura, SICE Measurement Division Best Paper Award, “Phygital Field: An Integrated Field with Physical Robots and Digital Images using Projection-based Localization and Control Method,” 2019.8.
  10. Takefumi Hiraki, Shogo Fukushima, Hiroshi Watase, and Takeshi Naemura, Electrical Science and Engineering Promotion Student Paper Award, “Pixel-level Visible Light Communication Projector with Interactive Update of Images and Data,” 2019.3.
  11. Atsuro Arami, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, IEICE Human Communication Award, “Encoding Scheme for Improving Image Quality and Data Transfer Rate of PVLC Projector,” 2018.12.
  12. Atsuro Arami, Takefumi Hiraki, Shogo Fukushima, and Takeshi Naemura, IEICE MVE Award (Best Paper Award), “Encoding Scheme for Improving Image Quality and Data Transfer Rate of PVLC Projector,” 2018.1.
  13. Naemura Lab, the University of Tokyo (Takefumi Hiraki, Shogo Fukushima, Takeshi Naemura), METI Innovative Technologies 2016, “Phygital Field,” 2016.10.
  14. Takefumi Hiraki, Issei Takahashi, Shogo Fukushima, and Takeshi Naemura, IEICE MVE Award (Best Paper Award), “Controlling Swarms of Robots using a PVLC Projector,” 2015.10.