A coupled-mode theory for two-dimensional exterior Helmholtz problems based on the Neumann and Dirichlet normal mode expansion. - Kei Matsushima; Yuki Noguchi; Takayuki Yamada (CoRR, 2022)

A topology optimization of open acoustic waveguides based on a scattering matrix method. - Kei Matsushima; Hiroshi Isakari; Toru Takahashi 002; Toshiro Matsumoto (CoRR, 2022)

Level set-based multiscale topology optimization for a thermal cloak design problem using the homogenization method. - Makoto Nakagawa; Yuki Noguchi; Kei Matsushima; Takayuki Yamada (CoRR, 2023)

Orientation Optimization Based on Topological Derivatives in Cooperation with Multi-Material Topology Optimization Based on Extended Level Set Method. - Masaki Noda; Kei Matsushima; Takayuki Yamada (CoRR, 2023)

Topology optimization for rarefied gas flow problems using density method and adjoint IP-DSMC. - Kaiwen Guan; Kei Matsushima; Yuki Noguchi; Takayuki Yamada (J. Comput. Phys., 2023)

Multicomponent Topology Optimization Method Considering Stepwise Linear Assemblability with a Fictitious Physical Model. - R. Hirosawa; Masaki Noda; Kei Matsushima; Yuki Noguchi; Takayuki Yamada (Comput. Aided Des., 2024)

Injectivity of boundary integral operator in direct-indirect mixed Burton-Miller equation for wave scattering problems with transmissive circular inclusion. - Yasuhiro Matsumoto; Kei Matsushima (JSIAM Lett., 2025)