31 citations · 141 across the 11 of their papers we have counts for
11 papers
Recycling computational processes of dynamic programming for combinatorial optimization problems: a reservoir computing approach
Sora Todaka, Akihiro Yamamoto, Nozomi Akashi
Reusing previously computed results is a long-standing principle for reducing computational cost, but such reuse has largely been confined to a single problem's computation. Sharin…
One-shot prediction of noise-induced bifurcations with reservoir computing
Nozomi Akashi, Takayuki Watanabe, Masato Hara +4
Dynamical systems can exhibit complex responses when noise is injected. In particular, dynamics can be qualitatively altered by dynamic noise, a phenomenon known as noise-induced b…
Incorporating Coupling Knowledge into Echo State Networks for Learning Spatiotemporally Chaotic Dynamics
Kuei-Jan Chu, Nozomi Akashi, Akihiro Yamamoto
Machine learning methods have shown promise in learning chaotic dynamical systems, enabling model-free short-term prediction and attractor reconstruction. However, when applied to…
Gradient-based optimization of spintronic devices
Yusuke Imai, Shuhong Liu, Nozomi Akashi +1
The optimization of physical parameters serves various purposes, such as system identification and efficiency in developing devices. Spin-torque oscillators have been applied to ne…
Exploiting Chaotic Dynamics as Deep Neural Networks
Shuhong Liu, Nozomi Akashi, Qingyao Huang +2
Chaos presents complex dynamics arising from nonlinearity and a sensitivity to initial states. These characteristics suggest a depth of expressivity that underscores their potentia…
Virtual reservoir acceleration for CPU and GPU: Case study for coupled spin-torque oscillator reservoir
Thomas Geert de Jong, Nozomi Akashi, Tomohiro Taniguchi +2
We provide high-speed implementations for simulating reservoirs described by -coupled spin-torque oscillators. Here also corresponds to the number of reservoir nodes. We ben…
Embedding bifurcations into pneumatic artificial muscle
Nozomi Akashi, Yasuo Kuniyoshi, Taketomo Jo +4
Harnessing complex body dynamics has been a long-standing challenge in robotics. Soft body dynamics is a typical example of high complexity in interacting with the environment. An…
Step-like dependence of memory function on pulse width in spintronics reservoir computing
Terufumi Yamaguchi, Nozomi Akashi, Kohei Nakajima +3
Physical reservoir computing is a type of recurrent neural network that applies the dynamical response from physical systems to information processing. However, the relation betwee…
Periodic structure of memory function in spintronics reservoir with feedback current
Terufumi Yamaguchi, Nozomi Akashi, Sumito Tsunegi +3
The role of the feedback effect on physical reservoir computing is studied theoretically by solving the vortex-core dynamics in a nanostructured ferromagnet. Although the spin-tran…
Synchronization and chaos in a spin-torque oscillator with a perpendicularly magnetized free layer
Terufumi Yamaguchi, Nozomi Akashi, Kohei Naka jima +3
Synchronization and chaos caused by alternating current and microwave field in a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnet…
Chaos in nanomagnet via feedback current
Tomohiro Taniguchi, Nozomi Akashi, Hirofumi Notsu +3
Nonlinear magnetization dynamics excited by spin-transfer effect with feedback current is studied both numerically and analytically. The numerical simulation of the Landau-Lifshitz…