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Imabuchi, Takashi; Kawabata, Kuniaki
Journal of Robotics and Mechatronics, 36(1), p.63 - 70, 2024/02
Imabuchi, Takashi; Kawabata, Kuniaki
Proceedings of 2024 IEEE/SICE International Symposium on System Integration (SII2024) (Internet), p.141 - 146, 2024/01
Tamii, Atsushi*; Pellegri, L.*; Sderstrm, P.-A.*; Allard, D.*; Goriely, S.*; Inakura, Tsunenori*; Khan, E.*; Kido, Eiji*; Kimura, Masaaki*; Litvinova, E.*; et al.
European Physical Journal A, 59(9), p.208_1 - 208_21, 2023/09
Times Cited Count:2 Percentile:79.22(Physics, Nuclear)no abstracts in English
Imabuchi, Takashi; Kawabata, Kuniaki
Proceedings of 20th International Conference on Ubiquitous Robots (UR 2023), p.632 - 633, 2023/06
Hirota, Yuki*; Tominaga, Taiki*; Kawabata, Takashi*; Kawakita, Yukinobu; Matsuo, Yasumitsu*
Bioengineering (Internet), 10(5), p.622_1 - 622_17, 2023/05
Times Cited Count:0 Percentile:0.01(Biotechnology & Applied Microbiology)Imabuchi, Takashi; Kawabata, Kuniaki
Proceedings of 2023 IEEE/SICE International Symposium on System Integration (SII 2023) (Internet), p.396 - 400, 2023/01
Hirota, Yuki*; Tominaga, Taiki*; Kawabata, Takashi*; Kawakita, Yukinobu; Matsuo, Yasumitsu*
Bioengineering (Internet), 9(10), p.599_1 - 599_17, 2022/10
Times Cited Count:2 Percentile:30.14(Biotechnology & Applied Microbiology)Imabuchi, Takashi; Tanifuji, Yuta; Kawabata, Kuniaki
Proceedings of 2022 IEEE/SICE International Symposium on System Integration (SII 2022) (Internet), p.1036 - 1040, 2022/01
This paper describes a method for discrimination of the structures in nuclear power station by deep learning based on 3D point cloud data. In order to promote safe and steady decommissioning work, it is important to estimate and assume the condition in nuclear power station based on the measured sensor data. Especially, the data of the dose rate in the workspace is useful to plan the decommissioning task and, the shape and the material property of the structures in the workspace are required for the dose rate simulation. Shape data can be obtained by such as 3D Scan, however, it is difficult to acquire the material property data of the objects. Therefore, we consider that it is possible that the major material property can be estimated from the category of the structures in nuclear power station. In this paper, we proposed a structure discrimination method by 3D semantic segmentation with 3D point cloud data that consists of labeled points by referring category labels of CAD data of existing nuclear facility. We reported discrimination performance of the proposed method by hold-out validation.
Mori, Kazuhiro*; Okumura, Ryo*; Yoshino, Hirofumi*; Kanayama, Masaya*; Sato, Setsuo*; Oba, Yojiro; Iwase, Kenji*; Hiraka, Haruhiro*; Hino, Masahiro*; Sano, Tadafumi*; et al.
JPS Conference Proceedings (Internet), 33, p.011093_1 - 011093_6, 2021/03
no abstracts in English
Kanayama, Hideyuki*; Hiyoshi, Noritake*; Ogawa, Fumio*; Kawabata, Mie*; Ito, Takamoto*; Wakai, Takashi
Zairyo, 68(5), p.421 - 428, 2019/05
This study presents creep damage assessment method for Mod. 9Cr-1Mo steel by sampling creep testing with thin plate specimen. Tensile creep rupture tests were performed using three different sizes of specimen under two different test environments to verify the creep testing with the thin plate specimen. Time to rupture of Mod. 9Cr-1Mo steel using three different sizes were almost same. In addition, there was no effect of environment on time to rupture. Pre-damaged thin plate specimens were machined from a bulk specimen's gage section that pre-damage test was performed with. Pre-damage based on life fraction rule were 8%, 16% and 25%. No effect of the process of machining pre-damaged specimen on time to rupture was confirmed by verification tests in same test condition as pre-damage test. Stress acceleration creep rupture tests were performed to estimate creep damage assessment. Creep damage assessment by stress acceleration creep rupture tests was sufficiently accurate estimate. Creep damage assessments by Vickers hardness and lath width were compared with the assessment by stress acceleration creep rupture tests to study applicability of these methods.
Nagai, Yasuki; Hashimoto, Kazuyuki; Hatsukawa, Yuichi; Saeki, Hideya; Motoishi, Shoji; Sonoda, Nozomi; Kawabata, Masako; Harada, Hideo; Kin, Tadahiro*; Tsukada, Kazuaki; et al.
Journal of the Physical Society of Japan, 82(6), p.064201_1 - 064201_7, 2013/06
Times Cited Count:43 Percentile:85.20(Physics, Multidisciplinary)Suzuki, Masahiro; Machida, Masahiko; Ito, Rintaro; Kawabata, Kuniaki; Yamaguchi, Takashi; Okamoto, Koji
no journal, ,
no abstracts in English
Matsuhira, Nobuto*; Komatsu, Ren*; Nakashima, Shinsuke*; Yamashita, Atsushi*; Fukui, Rui*; Takahashi, Hiroyuki*; Shimazoe, Kenji*; Woo, H.*; Tamura, Yusuke*; Takashi, Takayuki*; et al.
no journal, ,
This research aims to develop human resources in the field of remote technology for the decommissioning of the Fukushima Daiichi Nuclear Power Plant. We conduct research on a monitoring platform for fuel debris removal. Here, the developments on prototype experiments were described. We expect to develop research personnel through participation in projects, lectures, and facility tours.
Nakamura, Keita*; Hanari, Toshihide; Madokoro, Hirokazu*; Imabuchi, Takashi; Kawabata, Kuniaki; Nix, S.*; Doi, Akio*
no journal, ,
This paper introduces a research effort for faster 3D environment modeling of the workspace for decommissioning activities at the Fukushima Daiichi Nuclear Power Plant, applying as input video images shot during an investigation of the reactor containment vessel and reactor building. Especially, we construct a system that allows the selection of a 3D reconstruction method with as much information as possible within a specified time limit. We challenge this study with three methods: photogrammetry, simulation, and AI technology. Finally, we aim to integrate the results of each research to build a prototype system that automatically generates a more informative 3D reconstruction result within a specified time and according to the extracted feature values.
Hanari, Toshihide; Imabuchi, Takashi; Nakamura, Keita*; Kawabata, Kuniaki
no journal, ,
This paper introduces an image quality assessment on a 3D modeling to grasp the internal state of the nuclear reactor for a decommissioning of the Fukushima Daiichi Nuclear Power Station. We try a quantitative evaluation of videos or images acquired by the investigation inside the primary containment vessels and the reactor buildings for an efficient 3D reconstruction. Finally, we aim to develop a rapid 3D reconstruction method based on the image quality assessment.
Imabuchi, Takashi; Kawabata, Kuniaki
no journal, ,
no abstracts in English
Imabuchi, Takashi; Hanari, Toshihide; Kawabata, Kuniaki
no journal, ,
no abstracts in English
Segawa, Mariko; Shinohara, Takenao; Kai, Tetsuya; Iikura, Hiroshi; Oi, Motoki; Oikawa, Kenichi; Harada, Masahide; Sakai, Kenji; Soyama, Kazuhiko; Aizawa, Kazuya; et al.
no journal, ,
Hanari, Toshihide; Imabuchi, Takashi; Kawabata, Kuniaki
no journal, ,
This paper introduces an image quality assessment on a 3D modeling to grasp the internal state of the nuclear reactor for the decommissioning of the Fukushima Daiichi Nuclear Power Station. We tried a quantitative evaluation of videos or images acquired by the investigation inside the primary containment vessels for an efficient 3D reconstruction and investigated the effects of image correction on feature extraction and matching using the images added noise. As a result, we confirmed that the number of corresponding points by feature matching between images improves with an increase in a score of image quality assessment.
Suzuki, Jiro*; Kajimoto, Ryoichi; Ohara, Takashi; Yonemura, Masao*; Aoyagi, Tetsuo; Manabe, Atsushi*; Nakatani, Takeshi; Otomo, Toshiya*; Kawabata, Setsuya*
no journal, ,
Manyo-Lib is a framework of software designed for data analysis for neutron scattering experiment. It is one of the fundamental software used in J-PARC/MLF. Manyo-Lib consists of class libraries of C++ and Python interfaces that wrap the class libraries. The purpose of Manyo-lib is to offer operators for analysis, data containers, distributed computing environment, common data formats necessary to analyzing experiment data generated by various scattering equipments and various research regions. We are going to use NeXus as our common file format.