Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Yamada, Taichi; Suzuki, Soichiro; Ito, Rintaro; Ota, Yua*; Kaneko, Eiichiro*; Ogane, Katsuji*; Kawabata, Kuniaki
Advanced Robotics, 40(5), p.259 - 270, 2026/03
Times Cited Count：0 Percentile：0.00(Robotics)We develop a test method to evaluate the vertical moving performance of an unmanned aircraft system (UAS) in a narrow environment, specifically performance for ascending through a narrow aperture. This research aims to boost the UAS industry by pushing for the expansion of UAS use into various places and situations. UAS users should know whether the UAS performance is enough to achieve their objectives and what UAS suits them. However, discussing what/how much UASs can do is complex, especially in a place or situation affecting some UAS functions. Thus, the test method provides an easy-to-understand evaluation of UAS performance for mobility to access a destination in a narrow environment, even for UAS users without technical knowledge. To develop an acceptable test method for the UAS industry, we repeatedly held demonstrations and discussions with UAS manufacturers and users to incorporate their opinions from the early stages of this research. In addition, the experiments show that the test method appropriately indicates the difference in UAS performance. This paper describes the approach of UAS performance evaluation to promote the UAS industry, the development along with UAS users' opinions, and the result of the experiments to compare the type of UAS and consideration.
Usami, Hiroshi; Ito, Rintaro; Sanada, Yukihisa
JAEA-Review 2025-050, 57 Pages, 2026/02
JAEA-Review-2025-050.pdf:17.19MB
The decommissioning of the TEPCO's Fukushima Daiichi Nuclear Power Station is a long-term project, and the training of young engineers and researchers who will be responsible for future decommissioning is a necessary and urgent task. Since 2016, Collaborative Laboratories for Advanced Decommissioning Science has been continuously organizing "Conference for R&D Initiative on Nuclear Decommissioning Technology by the Next Generation (NDEC)" for students who are engaged in research activities for decommissioning. NDEC is a forum for students to present their research for the purpose of human resource development and networking among young researchers, and to increase their motivation for decommissioning research. NDEC-10 was held at "Plaza-Bansho" in Tsuruga-City, Fukui Prefecture, from February 26 - 27, 2025. This proceeding compiles the contents of report papers in the conference.
Kimura, Rintaro*; Sumita, Takehiro*; Osawa, Takahito; Matsuno, Kota*; Nakashima, Kunihiko*; Saito, Noritaka*
Tetsu To Hagane, 111(15), p.955 - 962, 2025/11
This study developed a new system to address the maintenance challenges of conventional high-temperature thermocouple techniques. Utilizing LabVIEW, the system simplifies complex circuitry, allowing for high-precision and flexible temperature control with basic technical knowledge. Testing confirmed its reliability and ability to control complex temperature patterns. The system successfully created a TTT diagram for a specific material, and image analysis enabled objective, quantitative determination of crystallization timing. This new system offers a significant advancement in high-temperature observation and control.
Ito, Rintaro
CROSS T&T, (80), p.48 - 52, 2025/06
The Decommissioning Robot Competition is a robot competition held for students at technical colleges nationwide to foster human resources who will be responsible for the future of decommissioning work at Tokyo Electric Power Company Holdings, Inc. (TEPCO) Fukushima Daiichi Nuclear Power Station and to stimulate interest in decommissioning technology. This paper introduces the efforts made so far in the Decommissioning Robot Competition.
Usami, Hiroshi; Ito, Rintaro; Tagawa, Akihiro
JAEA-Review 2024-045, 49 Pages, 2024/12
JAEA-Review-2024-045.pdf:13.38MB
The decommissioning of the TEPCO's Fukushima Daiichi Nuclear Power Station is a long-term project, and the training of young engineers and researchers who will be responsible for future decommissioning is a necessary and urgent task. Since 2016, Collaborative Laboratories for Advanced Decommissioning Science has been continuously organizing "Conferences for R&D Initiative on Nuclear Decommissioning Technology by the Next Generation (NDEC)" for students who are engaged in research activities for decommissioning. NDEC is a forum for students to present their research for the purpose of human resource development and networking among young researchers, and to increase their motivation for decommissioning research. NDEC-9 was held at "Manabi-no-Mori" in Tomioka-machi, Fukushima Prefecture, from March 21-22, 2024. This proceeding compiles the contents of report papers in the conference.
Kawabata, Kuniaki; Imabuchi, Takashi; Shirasaki, Norihito*; Suzuki, Soichiro; Ito, Rintaro; Aoki, Yuto; Omori, Takazumi
ROBOMECH Journal (Internet), 11, p.11_1 - 11_11, 2024/09
Machida, Masahiko; Shi, W.*; Yamada, Susumu; Miyamura, Hiroko; Yoshida, Toru*; Hasegawa, Yukihiro*; Okamoto, Koji; Aoki, Yuto; Ito, Rintaro; Yamaguchi, Takashi; et al.
Proceedings of Waste Management Symposia 2023 (WM2023) (Internet), 11 Pages, 2023/02
and Tb
measured by gel electrophoresis techniquesNakano, Sumika*; Marumo, Kazuki*; Kazami, Rintaro*; Saito, Takumi*; Haraga, Tomoko; Tasaki-Handa, Yuiko*; Saito, Shingo*
Environmental Science & Technology, 55(22), p.15172 - 15180, 2021/11
Times Cited Count：7 Percentile：25.40(Engineering, Environmental)Humic acid (HA) can strongly complex with metal ions to form a supramolecular assembly via coordination binding. However, determining the supramolecular size distribution and stoichiometry between small HA unit molecules constituting HA supramolecule and metal ions has proven to be challenging. Here, we investigated the changes in the size distributions of HAs induced by Cu and Tb ions using a unique polyacrylamide gel electrophoresis (PAGE) for the separation and quantification of HA complexes and metal ions bound, followed by UV-Vis spectroscopy and EEM-PARAFAC. It was found that the supramolecular behaviors of Cu and Tb complexes with HA collected from peat and deep groundwater (HHA) differed. Our results suggest that this supramolecular stoichiometry is related to the abundance of sulfur atoms in the elemental composition of HHA. Our results provide new insights into HA supramolecules formed via metal complexation.
Nakagawa, Hiroshi; Saio, Tomohide*; Nagao, Michihiro*; Inoue, Rintaro*; Sugiyama, Masaaki*; Ajito, Satoshi; Tominaga, Taiki*; Kawakita, Yukinobu
Biophysical Journal, 120(16), p.3341 - 3354, 2021/08
Times Cited Count：9 Percentile：46.72(Biophysics)A multi-domain protein can have various conformations in solution. Interactions with other molecules result in the stabilization of one of the conformations and change in the domain dynamics. SAXS, a well-established experimental technique, can be employed to elucidate the conformation of a multi-domain protein in solution. NSE spectroscopy is a promising technique for recording the domain dynamics in nanosecond and nanometer scale. Despite the great efforts, there are still under development. Thus, we quantitatively removed the contribution of diffusion dynamics and hydrodynamic interactions from the NSE data via incoherent scattering, revealing the differences in the domain dynamics of the three functional states of a multi-domain protein, MurD. The differences among the three states can be explained by two domain modes.
Kawabata, Kuniaki; Suzuki, Kenta; Isowa, Mitsuru*; Horiuchi, Kazunori; Ito, Rintaro
Proceedings of 14th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI 2017) (USB Flash Drive), p.561 - 564, 2017/06
This paper describes the current status of the development of a simulation system for remotely operated robots. The system will be used for operator proficiency training and robot performance verification. Our purpose for developing this system is to contribute to decommissioning of the Fukushima Daiichi Nuclear Power Station (FDNPS). The simulator system was designed using Choreonoid, a simulator development tool. The effects of view disturbances, communication failures, and so on are extended functions that are implemented on the simulator. The effects of water submergence on the physical behavior of underwater robots are also implemented. In this paper, we introduce the prototype of the robotic simulator system with the newly implemented extended functions. Some examples of system output are shown.
Suzuki, Masahiro; Aoki, Yuto; Machida, Masahiko; Ito, Rintaro; Kawabata, Kuniaki; Yamaguchi, Takashi; Okamoto, Koji
no journal, ,
Yamada, Taichi; Aoki, Yuto; Suzuki, Soichiro; Ito, Rintaro; Kawabata, Kuniaki
no journal, ,
We develop test methods for Unmanned Aircraft System (UAS) mobility evaluation in a narrow space. This development aims to provide an easy-to-understand evaluation for people without technical knowledge, such as UAS users, and to boost the UAS industry. To indicate UAS performance in an easy-to-understand, the test methods in this research evaluate how much the UAS can do the task based on actually performing the test task in the test field. In addition, the test methods have variable environmental factors that dominate the task performance to discuss the UAS's environmental applicability for facilitating UAS usage scenario expansion. Because accepting the test methods for UAS users and manufacturers is essential for boosting the industry, this development is proceeding while discussing with UAS users and manufacturers. This paper introduces the development of a test method for evaluating UAS mobility for ascending through an aperture.
Yamada, Taichi; Aoki, Yuto; Suzuki, Soichiro; Ito, Rintaro; Kawabata, Kuniaki
no journal, ,
We develop UAS test method to evaluate its mobility capability in a narrow space. This research aims to provide an easy-to-understand evaluation of UAS environmental applicability for UAS boosting industry. This paper introduces an experiment to investigate the influence of UAS flight from a confined environment. In the experiment, we evaluate UAS mobility with 2 test filed, one open and the other confined, and compare these evaluation results. Through the experiment, we found that in a confined space, UAS makes a rocking motion and is attracted to walls when flying nearby the wall, and stable flight becomes difficult as a result.
LaGoto, Yu*; Ito, Yuki*; Ide, Ikuo*; Ino, Takashi*; Endo, Shunsuke; Oku, Takayuki; Okudaira, Takuya*; Okuizumi, Mao*; Kameda, Kento*; Kawamura, Shiori*; et al.
no journal, ,
no abstracts in English
Isowa, Mitsuru; Suzuki, Kenta; Ito, Rintaro; Horiuchi, Kazunori*; Kawabata, Kuniaki
no journal, ,
Simulation technology is important for efficient development of remotely operated robots for decommissioning Fukushima Daiichi Nuclear Power Plants (herein referred to as 1F) and training operators to use the robots. We developed an extension to Choreonoid to simulate operation of an underwater, remotely operated vehicle (ROV). The extension was developed using a network traffic controller and includes 3D environmental models of 1F. This paper provides an overview of the extension.
Ito, Rintaro; Suzuki, Kenta; Horiuchi, Kazunori; Hirano, Hiroyasu
no journal, ,
In the decommissioning of TEPCO Fukushima Daiichi Nuclear Power Plant (1F), it is important to prepare in advance based on data and information on the spatial structure and dose distribution within the facility is important. The virtual reality system (VR system) of the Naraha Remote Technology Development Center presents the structure and equipment of 1F in 3D and can also present the dose distribution. This system is utilized for planning, training, etc. of the work related to decommissioning. In order to make effective use of this VR system in the future, it is also required to reproduce precisely the situation at the work site, to enable planning and training, etc of work in the situation close to the workplace. To that end, it will be necessary to expand 1F data to be incorporated into the VR system and to quickly reflect on-site situations that are constantly changing due to work. In this paper, we report on attempts to enhance the functions of the VR system that we recently worked on, taking into account such points.
Kawabata, Kuniaki; Shirasaki, Norihito*; Abe, Hiroyuki*; Hanari, Toshihide; Ito, Rintaro; Imabuchi, Takashi; Yamada, Taichi
no journal, ,
This paper describes a system for realizing simultaneous and synchronized collection of air dose rates and measurement locations for efficient dosimetry survey and spatio-temporal dosimetry data logging in nuclear facilities. The prototype system, which is currently under development, mainly consists of a 3D LiDAR-SLAM unit and a dosimeter integrated in a ROS framework. In this paper, we present the configuration of the prototype and the preliminary experimental results of dosimeter position estimation using it.
Aoki, Yuto; Ito, Rintaro; Kitamura, Akihiro; Omori, Takazumi; Taniguchi, Tatsuro; Ide, Hiroshi
no journal, ,
In this report, we present the validation results of the radiation source inverse estimation computation method and the effectiveness evaluation method of the "estimation system of radiation sources and dose rates" developed by JAEA. As for the validation test, the JMTR was used as the evaluation site, and the results of radiation source inverse estimation computations were compared with measured data. As a result, it was confirmed that the hot spot could be estimated approximately well. As for the effectiveness evaluation, the test field to be established at the NARREC and at the JMTR were used as the evaluation sites, and the effectiveness evaluation items such as the functions of each tool and the process of the system were summarized.
Hanari, Toshihide; Imabuchi, Takashi; Tanifuji, Yuta; Ito, Rintaro
no journal, ,
no abstracts in English
Suzuki, Masahiro; Yamaguchi, Takashi; Machida, Masahiko; Kawabata, Kuniaki; Ito, Rintaro
no journal, ,
In the decommissioning of the Fukushima Daiichi NPS (1F), prior to the full-scale implementation of fuel debris removal operations, it is necessary to improve the on-site environment in order to safely and efficiently construct access routes in the reactor building (R/B). Then, JAEA is now developing a prototype system that estimates radioactive source distributions by using on-site dose rate data and examines countermeasure effects of such as decontamination, shielding with estimated contamination (radiation sources) on the estimated sources in cyberspace. This report presents overview of the development project and its current status.
