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- S. Nakano, G. Ueno, T. Higuchi
- 2007

A new filtering technique for sequential data assimilation, the merging particle filter (MPF), is proposed. The MPF is devised to avoid the degeneration problem, which is inevitable in the particle filter (PF), without prohibitive computational cost. In addition, it is applicable to cases in which a nonlinear relationship exists between a state and observed… (More)

- Genta Ueno, Nagatomo Nakamura, Tomoyuki Higuchi, Takashi Tsuchiya, Shinobu Machida, Tohru Araki
- Progress in Discovery Science
- 2000

Recent space plasma observations have provided us with three-dimensional velocity distributions having multiple peaks. We propose a method for analyzing such velocity distributions via a multivariate Maxwellian mixture model where each component of the model represents each of the multiple peaks. The parameters of the model are determined through the… (More)

- G. Ueno, T. Higuchi, T. Kagimoto, N. Hirose
- 2006 IEEE Nonlinear Statistical Signal Processing…
- 2006

We report the first application of the ensemble Kalman filter (EnKF) to an intermediate coupled atmosphere-ocean model by [1], into which the sea surface height (SSH) anomaly observations by TOPEX/POSEIDON (T/P) altimetry are assimilated. Smoothed estimates ofthe 54,403 dimensional state are obtained from 1981 observational points with 2048 ensemble… (More)

- Genta Ueno, Nagatomo Nakamura, Tomoyuki Higuchi
- Discovery Science
- 2001

Electron velocity distribution obtained by direct spacecraft observation in space is contaminated by photoelectrons. The photoelectrons are generated due to the solar ultraviolet ray, and are regarded as artificial noise from a viewpoint of scientific research. We propose a method for separating photoelectron component from ambient electron component. Our… (More)

- Tohru Araki, Toshihiko Iyemori, +5 authors Akiniro Saito
- Discovery Science
- 1998

- Hiroshi Kato, Akira Yoshizawa, Genta Ueno, Shigeru Obayashi
- J. Comput. Physics
- 2015

Article history: Received 1 May 2014 Received in revised form 5 December 2014 Accepted 6 December 2014 Available online 12 December 2014

- Genta Ueno, Shinobu Machida, Nagatomo Nakamura, Tomoyuki Higuchi, Tohru Araki
- Discovery Science
- 1999

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