8 citations · 13 across the 2 of their papers we have counts for
2 papers
physics.soc-ph2024★ 5 cited
Nonlinear trend of COVID-19 infection time series
Fumihiko Ishiyama
We have developed a nonlinear method of time series analysis that allows us to obtain multiple nonlinear trends without harmonics from a given set of numerical data. We propose to…
gr-qc2010★ 8 cited
The bounce hardness index of gravitational waves
Fumihiko Ishiyama, Ryutaro Takahashi
We present a method of mode analysis to search for signals with frequency evolution and limited duration in a given data stream. Our method is a natural expansion of the Fourier an…