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2 results on '"Shinsuke Tokunaga"'

1. R&D Activities for Fusion DEMO in the QST Rokkasho Fusion Institute

Author

Ishii, Yasutomo, Nobuyuki, Aiba, Masami, Ando, Nobuyuki, Asakura, Bierwage, Andreas, Yuuki, Edao, Kazuo, Hasegawa, Takumi, Hayashi, Ryoji, Hiwatari, Tsuyoshi, Hoshino, Yoshitaka, Ikeda, Shinichi, Ishida, Kanetsugu, Isobe, Yasunori, Iwai, Atsushi, Kasugai, Yoshinori, Kawamura, Kim, Jaehwan, Keitaro, Kondo, Kwon, Saerom, Kai, Masuda, Akinobu, Matsuyama, Naoaki, Miyato, Motoki, Nakajima, Masaru, Nakamichi, Takashi, Nozawa, Kentaro, Ochiai, Masayuki, Ota, Makoto, Oyaizu, Yoshiteru, Sakamoto, Satoshi, Sato, Haruki, Seto, Takashi, Shiroto, Yoji, Someya, Hiroyasu, Tanigawa, Shinsuke, Tokunaga, Hiroyasu, Uto, Wang, Wei, Yoshiyuki, Watanabe, Masatoshi, Yagi, P.Cara, H.Dzitko, D.Gex, A.Jokinen, S.C.Lorenzo, K.Morishita, N.Nakajima, T.Ozeki, K.Sakamoto, M.Sugimoto, Yasutomo, Ishii, Ishii, Yasutomo, Nobuyuki, Aiba, Masami, Ando, Nobuyuki, Asakura, Bierwage, Andreas, Yuuki, Edao, Kazuo, Hasegawa, Takumi, Hayashi, Ryoji, Hiwatari, Tsuyoshi, Hoshino, Yoshitaka, Ikeda, Shinichi, Ishida, Kanetsugu, Isobe, Yasunori, Iwai, Atsushi, Kasugai, Yoshinori, Kawamura, Kim, Jaehwan, Keitaro, Kondo, Kwon, Saerom, Kai, Masuda, Akinobu, Matsuyama, Naoaki, Miyato, Motoki, Nakajima, Masaru, Nakamichi, Takashi, Nozawa, Kentaro, Ochiai, Masayuki, Ota, Makoto, Oyaizu, Yoshiteru, Sakamoto, Satoshi, Sato, Haruki, Seto, Takashi, Shiroto, Yoji, Someya, Hiroyasu, Tanigawa, Shinsuke, Tokunaga, Hiroyasu, Uto, Wang, Wei, Yoshiyuki, Watanabe, Masatoshi, Yagi, P.Cara, H.Dzitko, D.Gex, A.Jokinen, S.C.Lorenzo, K.Morishita, N.Nakajima, T.Ozeki, K.Sakamoto, M.Sugimoto, and Yasutomo, Ishii

Abstract

The current status and the progress of R&D activities for a Fusion DEMO reactor in the QST Rokkasho Fusion Institute is reported. In order to advance the JA DEMO activity, not only Japanese domestic activity but also international collaborations of Broader Approach Activity and ITER related activities are conducted in the QST Rokkasho Fusion Institute. Activities for DEMO design and relevant R&D, design of a fusion neutron source and development of an accelerator, ITER-TBS, tritium handling technology and information technology infrastructures including a supercomputer system and a remote experimentation system are carried out for a Fusion DEMO reactor.

Published
2022

2. Design for the distributed data locator service for multi-site data repositories

Author

Hideya, Nakanishi, Kenjiro, Yamanaka, Shinsuke, Tokunaga, Takahisa, Ozeki, Yuuki, Homma, Hideo, Otsu, Yasutomo, Ishii, Noriyoshi, Nakajima, Takashi, Yamamoto, Masayuki, Emoto, Ohsuna, M., Ito, T., Imazu, S., Nonomura, M., Yoshida, M., Ogawa, H., Maeno, H., Aoyagi, M., Yokota, M., Inoue, T., Nakamura, O., Shunji, Abe, Shigeo, Urushidani, Hideya, Nakanishi, Kenjiro, Yamanaka, Shinsuke, Tokunaga, Takahisa, Ozeki, Yuuki, Homma, Hideo, Otsu, Yasutomo, Ishii, Noriyoshi, Nakajima, Takashi, Yamamoto, Masayuki, Emoto, Ohsuna, M., Ito, T., Imazu, S., Nonomura, M., Yoshida, M., Ogawa, H., Maeno, H., Aoyagi, M., Yokota, M., Inoue, T., Nakamura, O., Shunji, Abe, and Shigeo, Urushidani

Abstract

The Remote Experimentation Centre (REC) in Japan has been preparing to replicate the full dataset of ITER over 10 000 km distance. In such a multi-site data repository environment, the data location informing service will be essential to find and retrieve the data efficiently. Considering the long latency time and the self sustainability of remote sites, the data location database should be running at each repository site. Multi-master asynchronous replication between cooperating databases will be essential to realize the remote experimental collaborations in fusion research. This study has investigated the functional differences of some relational databases and found that Postgres BDR has the expected database replication capabilities. Bi-directional replication (BDR) tests by using the LHD database and SNET revealed that the throughputs are sufficient for remote collaborations in fusion experiments.

Published
2021

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