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Papers - Narumi, Koya

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Crane: an integrated computational design platform for functional, foldable, and fabricable origami products

K Suto, Y Noma, K Tanimichi, K Narumi, T Tachi

ACM Transactions on Computer-Human Interaction 30 (4), 1-29 30 ( 4 ) 2023.09

ISSN 10730516

Despite the recent trend of computational origami for human-computer interaction (HCI) and digital fabrication, it is still difficult for designers to complete a series of design, simulation, and fabrication of objects leveraging computational origami theory. In this paper, we propose Crane, an integrated origami design platform implemented with Grasshopper. With this platform, users can seamlessly (1) design the 2D and 3D crease pattern, (2) simulate 3D folding transformation from the given crease pattern, (3) inversely find a new pattern under design constraints, (4) thicken the 2D pattern into a 3D volume along with the appropriate hinge structures for different fabrication methods, and (5) optionally connect the resulting design to other Rhinoceros or Grasshopper plugins for post-processes. To help understand how to use our system and demonstrate its feasibility, we showed three examples of origami products designed using our system. We also reported user feedback from the workshop as an evaluation.

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Inkjet 4D print: Self-folding tessellated origami objects by inkjet UV printing

K Narumi, K Koyama, K Suto, Y Noma, H Sato, T Tachi, M Sugimoto, ...

ACM Transactions on Graphics (TOG) 42 (4), 1-13 42 ( 4 ) 2023.08

ISSN 07300301

We propose Inkjet 4D Print, a self-folding fabrication method of 3D origami tessellations by printing 2D patterns on both sides of a heat-shrinkable base sheet, using a commercialized inkjet ultraviolet (UV) printer. Compared to the previous folding-based 4D printing approach using fused deposition modeling (FDM) 3D printers [An et al. 2018], our method has merits in (1) more than 1200 times higher resolution in terms of the number of self-foldable facets, (2) 2.8 times faster printing speed, and (3) optional full-color decoration. This paper describes the material selection, the folding mechanism, the heating condition, and the printing patterns to self-fold both known and freeform tessellations. We also evaluated the self-folding resolution, the printing and transformation speed, and the shape accuracy of our method. Finally, we demonstrated applications enabled by our self-foldable tessellated objects.

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Inkjet 4D Print

K NARUMI, K KOYAMA, KAI SUTO, Y NOMA, H SATO, T TACHI, ...

2023

Demonstrating poimo as Inflatable, Inclusive Mobility Devices with a Soft Input Interface

H Sato, R Niiyama, K Narumi, YA Seong, K Watanabe, R Yamamura, ...

ACM SIGGRAPH 2022 Emerging Technologies, 1-2 2022.07

In this demo, we showcase poimo, a series of POrtable and Inflatable MObility devices made of a balloon-like soft material called drop-stitch fabric. Poimo has two merits: (1) inflatability of a soft and lightweight body allowing users to deflate and carry it on a small scale and (2) inclusiveness enabling made-to-order design and fabrication of mobility devices for each user. As an alternative way to conventional rigid controllers, we also introduce a soft and deformable input interface to navigate a sofa-type poimo. Finally, we report two types of field studies: public users riding on two types of poimos on a flat paved road, and the authors riding on a sofa-type poimo in a traditional European environment with inclined stone-paved streets.

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Blow-up Print: Rapidly 3D Printing Inflatable Objects in the Compressed State

M Matsuura, K Narumi, T Aoki, Y Noma, K Nakashima, Y Kawahara, ...

ACM SIGGRAPH 2022 Posters, 1-2 2022.07

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Mapping FoodHCI Futures

J Deng, F Altarriba Bertran, L Yao, M Obrist, K Narumi, H Yang, ...

CHI Conference on Human Factors in Computing Systems Extended Abstracts, 1-5 2022.04

Recognizing the significant potential impact that HCI has on food practices and experiences, researchers and practitioners are undertaking a growing number of explorations of novel computing technology and food combinations. These explorations have so far primarily emphasized technology-driven systems and taken a human-centric perspective. We propose a Special Interest Group (SIG) in "foodHCI futures"that creates a space for researchers to discuss the boundaries of food incorporating HCI, and with the simultaneous aims of reconciling food with technology and extending our visions for human-food interactions towards anthropocentrism. Specifically, the SIG will be a beginning of developing a structured conceptual map of the possibilities for future technology interventions in food systems. In developing this map, we hope to encourage democratized debate, provoke new and divergent thoughts on the opportunities for foodHCI, and ultimately gain unique insights that contribute to preferable food futures.

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Printable origami bistable structures for foldable jumpers

TD Ta, Z Chang, K Narumi, T Umedachi, Y Kawahara

2022 International Conference on Robotics and Automation (ICRA), 7131-7137 2022-January 7131 - 7137 2022

ISSN 10504729

Origami/kirigami robotics are opening a path that leads to lightweight, compact, and expandable robots. However, it is generally challenging to design agile motions for origami/kirigami robots due to their size and the intrinsic limitation of the materials. In this paper, we propose to use the bistability of the waterbomb base structure to generate the swift motion of the robots. We evaluate the bistability of the waterbomb-based structure and build origami jumpers with different configurations of the body to help analyze the behavior of the waterbomb base bistable structure. The jumper is actuated by a phase change liquid pouch actuator. Our jumper is lightweight (0.3 g), flattenable, and able to jump to more than 12 times of its diameter and 112 times of its height.

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Corner-Reflector-Based Chipless RFID for Wide Range Readout with Low Power Millimeter Wave Radar

T IIZUKA, T SASATANI, N KOSAKA, M HISADA, K NARUMI, ...

情報処理学会シンポジウムシリーズ (CD-ROM) 2022 (1), 5-3 2022

Toward wirelessly cooperated shape-changing computing particles

J Kadomoto, T Sasatani, K Narumi, N Usami, H Irie, S Sakai, Y Kawahara

IEEE Pervasive Computing 20 (3), 9-17 (Institute of Electrical and Electronics Engineers ({IEEE})) 20 ( 3 ) 9 - 17 2021.07

ISSN 15361268

Widespread research is being conducted on computational materials. The challenge for the realization of computational materials is how to weave computers into everyday objects consisting of various shapes and form factors. One idea to achieve this vision is to build physical computational particles that can cooperatively communicate among others and, thereby, change the whole shape like clay. Wireless communication and power transfer are keys to making such computing particles happen. Thus, we introduce an approach to embody these particles using multiple tiny IC chips, which wirelessly cooperate with each other. This article shows the current state-of-the-art wireless communication and power transfer technologies integrated into IC chips to achieve fine-grained shape deformation of computers. Moreover, this article also presents recent trends and future directions in shape-changing human-computer interfaces research.

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Demonstrating Flower Jelly Printer for Parametrically Designed Flower Jelly

M Miyatake, K Narumi, Y Sekiya, Y Kawahara

Extended Abstracts of the 2021 CHI Conference on Human Factors in Computing … 2021.05

Flower jellies, a delicate dessert in which a flower-shaped jelly floats inside another clear jelly, fascinate people with both their beauty and elaborate construction. In efforts to simplify the challenging fabrication and enrich the design space of this dessert, we present Flower Jelly Printer: a printing device and design software for digitally fabricating flower jellies. Our design software lets users play with parameters and preview the resulting forms until achieving their desired shapes. We also developed slit injection printing that directly injects colored jelly into a base jelly, and shared several design examples to show the breadth of design possibilities. We hope to enable more people to design and create their own flower jellies while expanding access and the design space for digitally fabricated foods.

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Flower jelly printer: Slit injection printing for parametrically designed flower jelly

Miyatake M., Narumi K.

Conference on Human Factors in Computing Systems - Proceedings 2021.05

Flower jellies, a delicate dessert in which a fower-shaped jelly foats inside another clear jelly, fascinate people with both their beauty and elaborate construction. In eforts to simplify the challenging fabrication and enrich the design space of this dessert, we present Flower Jelly Printer: a printing device and design software for digitally fabricating fower jellies. Our design software lets users play with parameters and preview the resulting forms until achieving their desired shapes. We also developed slit injection printing that directly injects colored jelly into a base jelly, and shared several design examples to show the breadth of design possibilities. Finally, the user study with novice and experienced users demonstrates that our system benefts creators of all experience levels by iterative design and precise fabrication. We hope to enable more people to design and create their own fower jellies while expanding access and the design space for digitally fabricated foods.

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Flower jelly printer: Slit injection printing for parametrically designed flower jelly

Miyatake M., Narumi K.

Conference on Human Factors in Computing Systems - Proceedings 2021.05

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