Research Themes

Design of Acoustic and Elastic Devices Utilizing Non-Hermitian Physical Phenomena

Open Systems

• Discovered the occurrence of an exceptional point, a simultaneous degeneracy of eigenvalues and eigenmodes unique to non-Hermitian systems, in a spherical elastic body.
  • Deguchi, H., Matsushima, K., Yamada, T.,
    Observation of exceptional points in a spherical open elastic system, Journal of Sound and Vibration, Vol. 611 (2025.9), No. 119114.
    doi:10.1016/j.jsv.2025.119114

Damped Systems

• Topology optimization of isotropic viscoelastic composite microstructures based on periodic homogenization.
  • Deguchi, H., Matsushima, K., Yamada, T.,
    Topology optimization of isotropic viscoelastic microstructures based on periodic homogenization, arXiv preprints.
    arXiv:2505.05217
  • Deguchi, H., Matsushima, K., Yamada, T.,
    Numerical verification based on the homogenization method and realization of the complex modulus boundary by topology optimization for a 6mm hexagonal lattice viscoelastic body, Journal of JASCOME, Vol.25 (2025.12), No.15-251219, pp.121-127.
    doi:10.60443/jascome.25.0_121

Bendron

What is Bendron?

• A part that can create a “Bending Polyhedron.”
  • Bendron — A Part with Duality of Rigidity and Flexibility, The 15th Digital Modeling Contest, The Japan Society for Graphic Science.
  • It possesses a duality where the joints are rigid and the other parts are flexible.
  • It is produced using a 3D printer.

Exhibitions

• Bendron — Space-filling Polyhedron, Connecting Artifacts 02, October 27 – November 13, 2022, TIERS GALLERY (Omotesando).
• Space-filling Polyhedron with Parts That Have a Duality of Rigidity and Flexibility, Connecting Artifacts 2.5, June 24, 2023 – January 14, 2024, NTT InterCommunication Center [ICC].
• Parts with Duality of Rigidity and Flexibility, Connecting Artifacts 2.5, June 24, 2023 – January 14, 2024, NTT InterCommunication Center [ICC].
• Bendron — Space-filling Polyhedron, Connecting Artifacts 03, October 27 – November 13, 2022, Komaba Museum (The University of Tokyo, Komaba I Campus).
• Bendron — Fractal Space-filling Polyhedron, Connecting Artifacts 04, October 5 – October 27, 2024, Science Museum, Tokyo.
• Bendron — Washa-Washa, Connecting Artifacts 04, October 5 – October 27, 2024, Science Museum, Tokyo.
• Buckling Rhombic Dodecahedron, Connecting Artifacts 04, October 5 – October 27, 2024, Science Museum, Tokyo.

Workshops

• Kids workshop, 30th Annual Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA2025), March 26-28, 2025, Tokyo, Japan.
• Let’s make a Rhombic Dodecahedron using Cable Ties, Connecting Artifacts 04, October 20, 2024, Science Museum, Tokyo.