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Miki, Naoya*; Harazono, Yuki*; Ishii, Hirotake*; Shimoda, Hiroshi*; Koda, Yuya
International Electronic Journal of Nuclear Safety and Simulation (Internet), 9(2), p.162 - 171, 2018/12
Kyoto University reports on the distance information display system developed in collaboration between "Fugen" and Kyoto University. In the distance information display system, the worker can easily measure the distance of the object. In this presentation, we report the test results carried out with "Fugen" and the questionnaire results of the subjects.
Miki, Naoya*; Harazono, Yuki*; Ishii, Hirotake*; Shimoda, Hiroshi*; Koda, Yuya
Proceedings of 2nd International Conference on Computer-Human Interaction Research and Applications (CHIRA 2018) (USB Flash Drive), p.134 - 140, 2018/09
In this study, in order to make measuring lengths of the objects and the gaps at NPPs more efficient, the Distance Information Display System was developed, which make it easy for the dismantling workers to measure them. The results showed that the Distance Information Display System developed in this study can be used easily with extremely simple operation by the dismantling workers at NPPs, and the workers can also measure the lengths in a short time.
Fe and 
Co nuclear magnetic resonance studiesSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ueda, Hiroaki*; Tanioku, Yasuaki*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Takao, Kenta*; Shimoda, Aiko*; et al.
Physical Review B, 98(6), p.064403_1 - 064403_10, 2018/08
Times Cited Count：11 Percentile：45.49(Materials Science, Multidisciplinary)To specify preferential occupation sites of Co substituents and to clarify charge and spin states of Co ions in (La, Co)-cosubstituted hexagonal magnetoplumbite-type (M-type) Sr ferrite, Fe and Co nuclear magnetic resonance (NMR) spectra are measured under zero and external magnetic fields using powdered and single crystalline specimens. To a considerable degree, the charge compensation between La
and Co
works in the equal (La, Co)-codoped case, where more than half of the Co ions are considered to be present in the minority spin 
sites at the center of the oxygen tetrahedra, with the 
= 3/2 state carrying a small orbital moment owing to spin-orbit interaction. The remaining small number of high-spin Co ( = 3/2, 
= 1) ions with unquenched orbital moments would be distributed to the other octahedral 
, 
, and 
sites.
Bian, Z.*; Ishii, Hirotake*; Shimoda, Hiroshi*; Yoshikawa, Hidekazu*; Morishita, Yoshitsugu; Kanehira, Yoshiki; Izumi, Masanori
IEICE Transactions on Information and Systems, E90-D(6), p.963 - 974, 2007/06
Times Cited Count：4 Percentile：33.25(Computer Science, Information Systems)This study designed linecode marker, a new type of paper-based marker and proposed recognition, tracking algorithm for it in order to resolve these problems. In comparison of the conventional paper-based markers, such as square markers, circle markers, the linecode marker is not only just easier to set up in complex industrial environment, but also makes it possible to use AR in industrial plant. In order to evaluate the tracking accuracy, trackable distance of the proposed tracking method, an evaluation experiment was conducted in a large room. The experiment results show that: comparing with traditional marker-based tracking method, tracking possible distance extends extremely; tracking accuracy improved to a level of 20cm in 10m distance.
*; *; *; *
JNC TJ8400 99-049, 28 Pages, 1999/02
In study and development of high-level radioactive waste geological disposal, engineering study is being carried out on design, manufacturing, and installation of the engineering barrier to clarify the engineering method that can ensure performances necessary for the engineering barrier. For the overpack, which is one of composition elements of the engineering barrier, at present there are two conceptions; i.e. a carbon steel overpack (of simplex carbon steel construction) and a composite overpack (of two-layer construction having a carbon steel inside for strength and titanium, copper, or others outside for corrosion resistant). Studies are being carried out on them from the viewpoints of their respective functions and manufacturing. For the carbon steel overpack, development elements in manufacturing technology have already been extracted through manufacturing full-scale models. In this entrusted study, we carried out some tests to obtain informations about applicability of some manufacturing method, through manufacturing of full-scale copper canister model which established in the manufacturing method study of last year.
*; *; *; *
JNC TJ8400 99-048, 74 Pages, 1999/02
In study and development of high-level radioactive waste geological disposal, engineering study is being carried out on design, manufacturing, and installation of the engineering barrier to clarify the engineering method that can ensure performances necessary for the engineering barrier. For the overpack, which is one of composition elements of the engineering barrier, at present there are two conceptions; i.e. a carbon steel overpack (of simplex carbon steel construction) and a composite overpack (of two-layer construction having a carbon steel inside for strength and titanium, copper or others outside for corrosion resistant). Studies are being carried out on them from the viewpoints of their respective functions and manufacturing. With respect to the carbon steel overpack, development elements in manufacturing technology have already been extracted through manufacturing full-scale models. In this entrusted study, we carried out some tests to obtain informations about applicability of some manufacturing method, through manufacturing of full-scale copper canister model which established in the manufacturing method study of last year.
Ishii, Hirotake*; Bian, Z.*; Sekiyama, Tomoki*; Shimoda, Hiroshi*; Yoshikawa, Hidekazu*; Izumi, Masanori; Kanehira, Yoshiki; Morishita, Yoshitsugu
no journal, ,
This study is to development of line-marker and hybrid tracking technology including Multi camera and gyro sensor. Evaluation experiment for new tracking technology is conducted in Nuclear power plant.
Ishii, Hirotake*; Shimoda, Hiroshi*; Bian, Z.*; Nakai, Toshinori*; Izumi, Masanori; Morishita, Yoshitsugu; Kanehira, Yoshiki*
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three workers used the prototype system along with a scenario which dismantles an ion tower, and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared to the legacy recording method using paper documents, but a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
Shimoda, Hiroshi*; Ishii, Hirotake*; Sekiyama, Tomoki*; Bian, Z.*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
This study aims at developing an augmented reality system to support maintenance work of nuclear power plants. An accurate and wide-range tracking method is required as a key technology in order to realize the system. In this study, a new tracking method using multi-camera and gyro sensor has been developed in order to enlarge the area where the tracking is available with limited number of markers. Experimental evaluation result shows that the area where the developed method can cover is about 3 times larger than the method using single camera.
Ishii, Hirotake*; Shimoda, Hiroshi*; Bian, Z.*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
Improvement of tracking accuracy is an important issue when applying augmented reality to nuclear power plant fieldwork. Tracking accuracy depends highly on the marker arrangement when employing a tracking method using a camera and markers. Tracking accuracy becomes low if markers are pasted arbitrarily only on places that are easy to paste them onto. For those reasons, this study develops a marker arrangement optimization algorithm based on genetic algorithms. Tracking error caused by finite camera resolution is considered particularly in this study. A wheel tracking error computation method is developed to compute the tracking error from the marker arrangement. A genetic algorithm is adopted for obtaining higher tracking accuracy from an initial pool of marker arrangements using wheel tracking error computation as a fitness function. Trial results show that the tracking accuracy can be improved markedly by applying the marker arrangement optimization algorithm.
Ishii, Hirotake*; Bian, Z.*; Sekiyama, Tomoki*; Nakai, Toshinori*; Shimoda, Hiroshi*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
Augmented Reality is one of the promising technologies that will be able to improve efficiency and safety of the nuclear power plant maintenance work. In order to apply the Augmented Reality to the maintenance work, various studies must be done, such as improvement of the tracking technology, improvement of the user interface and human centered evaluation of the Augmented Reality system. The authors have conducted several studies of these issues for almost 5 years. In this paper, a part of these studies are reported.
Shimoda, Hiroshi*; Nakai, Toshinori*; Ishii, Hirotake*; Bian, Z.*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three professionals used the prototype system along with a scenario which dismantles an ion tower,and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared with the legacy recording method using paper instruction sheet, however a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
Izumi, Masanori; Morishita, Yoshitsugu; Shimoda, Hiroshi*; Ishii, Hirotake*; Nakai, Toshinori*; Bian, Z.*
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three workers used the prototype system along with a scenario which dismantles an ion tower, and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared to the legacy recording method using paper documents, but a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
LiMiyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; Fuchi, Yoshihide*; Nomura, Toru*; et al.
no journal, ,
A systematic study of astrophysical reaction rates on light neutron-rich nuclei using low-energy radioactive nuclear beams (RNB) is in progress at the tandem facility of Japan Atomic Energy Agency (JAEA). Direct measurements of reaction rates of Li(
, n)
B, 
B(, n)
N and, Li(d, p), (d, t), (d, ), (p, ) have been carried out. Measured excitation functions and obtained reaction rates will be presented. Possible r-process path via Li at each temperature during r-process and the influence of r-process abundance will be discussed.
Shimoda, Satoko*; Saito, Hironori*; Takase, Toshio*; Yamaguchi, Kohei; Oda, Chie; Honda, Akira
no journal, ,
The unstable primary mineral is dissolved and the precipitation of a steadier secondary mineral happens thermodynamically when a high alkaline groundwater of the cement system material origin is infiltrated from the radioactive waste geological disposal facilities to a peripheral bedrock. Therefore, the pore structure of the hostrock changes by the precipitation and dissolution, and the material transportation characteristic of the bedrock changes. It is necessary to decide the chemical reaction scheme for the analysis. However, the combination of the secondary minerals exists innumerably. Therefore, granite was assumed to be an example by summarizing the chemical reaction scheme in the mineral alteration scenario, and the mineral alteration scenario concerning the reaction with a high pH groundwater was presented. It dealt with the uncertainty concerning the mineral alteration by preparing two or more scenarios with a different alteration route.
Tachi, Yukio; Yotsuji, Kenji; Suyama, Tadahiro; Nakazawa, Toshiyuki*; Shimoda, Satoko*; Kuno, Yoshio*
no journal, ,
Sorption and diffusion of radionuclides in compacted bentonite are key processes in the safe geological disposal. The effects of porewater pH and salinity on Ni sorption and diffusion in compacted montmorillonite were investigated by experimental and modeling approaches. Distribution coefficients (Kd) and effective diffusion coefficients (De) of Ni in montmorillonite compacted to dry density of 800 kg/m
were measured under four conditions with different pH (6, 8) and salinities (0.05, 0.5 M NaCl). The Kd increased with increasing pH and with decreasing salinity of porewater, which are consistent with batch-derived Kd trends. The De values changed with porewater salinity, which are independent of pH. Sorption and diffusion behaviors were interpreted by coupling the thermodynamic sorption model, and the diffusion model based on EDL theory in narrow pores. The mechanistic model could be useful in predicting the sorption and diffusion of high sorbing species in compacted systems.
Tachi, Yukio; Shimoda, Satoko*; Nakazawa, Toshiyuki*; Suyama, Tadahiro*; Yotsuji, Kenji
no journal, ,
Sorption and diffusion behaviors of Ni in compacted montmorillonite were investigated under different pH and salinity conditions by batch sorption and diffusion experiments. The Ni sorption was measured under four conditions with different pH (6, 8) and salinities (0.05, 0.5 M NaCl), and as functions of Ni concentration and reaction time. The tracer-depletion curves and depth profiles obtained for compacted montmorillonite with dry density of 800 kg/m were interpreted by first-order kinetics sorption based on batch sorption results. The Kd increased with increasing pH and with decreasing salinity of porewater, which are consistent between batch and diffusion tests. Sorption and diffusion behaviors were interpreted by coupling the thermodynamic sorption model, and the diffusion model based on EDL theory in narrow pores.
Fe NMR study in La-Co substituted M-type Sr ferriteSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Shimoda, Aiko*; Waki, Takeshi*; Tabata, Yoshikazu*; Nakamura, Hiroyuki*
no journal, ,
Zero field NMR experiments on SrFe
O
and Sr
La
Fe
CoO have been performed. The substitued Co sites will be discussed based on the NMR spectra.
Co NMR study in La-Co substituted 
-type Sr FerriteSakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Shimoda, Aiko*; Waki, Takeshi*; Tabata, Yoshikazu*; Nakamura, Hiroyuki*
no journal, ,
Zero field NMR experiments have been done using powdered samples and single crystals of SrFeO and La-Co co-substituted SrLa
FeCoO. The single crystals were grown by the flux method. Co NMR signals have been observed in the lower frequency range of 50-100 MHz and in the higher frequency range of 300-400 MHz. Spectral intensity in the lower frequency range is stronger than that in the higher frequency range. We will discuss the spin and charge states of Co ions using the NMR results, some complementary experiments and theoretical considerations.
