Accès ouvert
2025
article
OpenAlex
Makoto Otsuka, K. Kodama, Keisuke Morita, Masayuki Ohzeki
This study proposes an approach for removing mislabeled instances from contaminated training datasets by combining surrogate model-based black-box optimization (BBO) with postprocessing and quantum annealing. Mislabeled training instances, a common issue in real-world datasets, often degrade model generalization, necessitating robust and efficient …
jp
(code pays fourni par la source)
Accès ouvert
2025
preprint
OpenAlex
Makoto Otsuka, K. Kodama, Keisuke Morita, Masayuki Ohzeki
This study proposes an approach for removing mislabeled instances from contaminated training datasets by combining surrogate model-based black-box optimization (BBO) with postprocessing and quantum annealing. Mislabeled training instances, a common issue in real-world datasets, often degrade model generalization, necessitating robust and efficient …
Accès ouvert
2024
article
OpenAlex
K. Kodama, Yasuhiro Hasegawa
This study aimed to determine various thermoelectric properties, including the dimensionless figure of merit (zT0), resistivity (ρTE), thermal conductivity (κTE), and Seebeck coefficient (S), using a combination of 3ω and time-domain impedance spectroscopy (TDIS) methods for a thermoelectric module at absolute temperature …
jp
(code pays fourni par la source)
2004
article
OpenAlex
Kei Masaki, J. Yagyu, Y. Miyo, Yoshito Gotoh et autres
jp
(code pays fourni par la source)
2003
article
OpenAlex
Yoshito Gotoh, J. Yagyu, Kei Masaki, K. Kizu et autres
jp
(code pays fourni par la source)
2003
article
OpenAlex
Kei Masaki, Kazuyoshi Sugiyama, Tetsuo Tanabe, Yoshito Gotoh et autres
jp
(code pays fourni par la source)
2003
conference-paper
OpenAlex
Kei Masaki, Masaaki Morimoto, Akira Sakasai, H. Takenaga et autres
In JT-60U, an outer divertor pumping slot was added to the W-shaped divertor with an inner pumping slot during the maintenance period, November to December 1998, in order to improve plasma performance especially in a detached state with no or inverse in-out …
2003
article
OpenAlex
Kiyoshi Sugiyama, Katsuyuki MIYASAKA, Tetsuo Tanabe, Kei Masaki et autres
Tritium Imaging Plate Technique (TIPT) is used to measure the tritium areal distribution on plasma facing graphite tiles of JT-60U. Measurement of the W-shaped divertor region showed that the surface tritium distribution of tiles used under the “both-side pumping” system was similar …
jp
(code pays fourni par la source)
2002
conference-paper
OpenAlex
Toshiki Ando, K. Kodama, M. Matsukawa, Y. Ouchi et autres
Wall damages of the JT-60U plasma facing components in the recent operation are more serious than in the previous one. Erosion of carbon fiber composite (CFC) divertor tiles due to field ripple of the toroidal coil is observed. Several bolt-loosening divertor tiles …
jp
(code pays fourni par la source)
2002
conference-paper
OpenAlex
Ikuo Kondo, H. Horiike, Y. Neyatani, M. Matsukawa et autres
The hardware performance of the JT-60U (JAERI Tokamak-60 Upgrade) tokamak machine was investigated in several aspects. The experimental operation has advanced to record D-D fusion power as high as 17 kW. The displacement of the toroidal field coil was measured, and the …
2002
article
OpenAlex
Tetsuo Tanabe, Katsuyuki MIYASAKA, Kei Masaki, K. Kodama et autres
jp
(code pays fourni par la source)
2002
conference-paper
OpenAlex
K. Kodama, T. Sasajima, Kei Masaki, N. Hosogane et autres
In JT-60U, the modification from the open divertor to the W-shaped divertor with pumps was conducted from February to May in 1997. To install a new divertor in the vessel, pre-inspection of the vacuum vessel, test of installation procedure with mock-ups of …