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Journal Articles

Present status and future perspective of R&D for 3D-ADRES (3-Dimensional Air Dose Rate Evaluation System); Evaluation scheme for air dose rate distributions in city and forest areas towards Fukushima's revitalization

Kim, M.; Malins, A.; Machida, Masahiko; Yoshimura, Kazuya; Saito, Kimiaki; Yoshida, Hiroko*; Yanagi, Hideaki*; Yoshida, Toru*; Hasegawa, Yukihiro*

RIST News, (67), p.3 - 15, 2021/09

no abstracts in English

Journal Articles

Structure of superconducting Ca-intercalated bilayer Graphene/SiC studied using total-reflection high-energy positron diffraction

Endo, Yukihiro*; Fukaya, Yuki; Mochizuki, Izumi*; Takayama, Akari*; Hyodo, Toshio*; Hasegawa, Shuji*

Carbon, 157, p.857 - 862, 2020/02

 Times Cited Count:5 Percentile:69.45(Chemistry, Physical)

no abstracts in English

Journal Articles

Simulation study of the effects of buildings, trees and paved surfaces on ambient dose equivalent rates outdoors at three suburban sites near Fukushima Dai-ichi

Kim, M.; Malins, A.; Yoshimura, Kazuya; Sakuma, Kazuyuki; Kurikami, Hiroshi; Kitamura, Akihiro; Machida, Masahiko; Hasegawa, Yukihiro*; Yanagi, Hideaki*

Journal of Environmental Radioactivity, 210, p.105803_1 - 105803_10, 2019/12

 Times Cited Count:3 Percentile:20.11(Environmental Sciences)

To improve the accuracy of simulations for air dose rates over fallout contaminated areas, the distribution of the radionuclides within the environment should be modelled realistically, e.g. considering differences in radioactivity levels between agricultural land, urban surfaces, and forest compartments. Moreover simulations should model the shielding of $$gamma$$ rays by buildings, trees and land topography. Here we outline a system for generating three dimensional models of urban and rural areas in Fukushima Prefecture. The $$^{134}$$Cs and $$^{137}$$Cs radioactivity distribution can be set flexibly across the different components of the model. The models incorporate realistic representations of local buildings, based on nine common Japanese designs, individual conifer and broadleaf trees, and the topography of the land surface. Models are generated from Digital Elevation Model (DEM) and Digital Surface Model (DSM) datasets, and refined by users assisted with ortho-photographs of target sites. Completed models are exported from the system in a format suitable for the Particle and Heavy Ion Transport code System (PHITS) for the calculation of air dose rates and other radiological quantities. The system is demonstrated by modelling a suburban area 4 km from the Fukushima Daiichi Nuclear Power Plant that has yet to be decontaminated. Air dose rates calculated in PHITS were correlated with measurements taken across the site in a car-borne survey.

Journal Articles

Research and development behind a computation system for 3D distributions of air dose rates in the environment; Estimating environmental radiation doses using PHITS together with remote sensing data

Kim, M.; Malins, A.; Sakuma, Kazuyuki; Kitamura, Akihiro; Machida, Masahiko; Hasegawa, Yukihiro*; Yanagi, Hideaki*

Isotope News, (765), p.30 - 33, 2019/10

Here we outline a system for generating three dimensional models of urban and rural areas in Fukushima Prefecture. The $$^{134}$$Cs and $$^{137}$$Cs radioactivity distribution can be set flexibly across the different components of the model. The models incorporate realistic representations of local buildings, individual conifer and broadleaf trees, and the topography of the land surface. The system is demonstrated by modelling a suburban area 4 km from the Fukushima Daiichi Nuclear Power Plant that has yet to be decontaminated. Air dose rates calculated in PHITS were correlated with measurements taken across the site in a car-borne survey.

Journal Articles

Development of an air dose rate evaluation system (3D-ADRES) for complex real environments in Fukushima Prefecture; Using remote sensing data and evaluating the influence of different features (topography, soil, buildings, trees, etc.)

Kim, M.; Malins, A.; Sakuma, Kazuyuki; Kitamura, Akihiro; Machida, Masahiko; Hasegawa, Yukihiro*; Yanagi, Hideaki*

RIST News, (64), p.3 - 16, 2018/09

To improve the accuracy of simulations for air dose rates over fallout contaminated areas, the distribution of the radionuclides within the environment should be modelled realistically, e.g. considering differences in radioactivity levels between agricultural land, urban surfaces, and forest compartments. Moreover simulations should model the shielding of $$gamma$$ rays by buildings, trees and land topography. Here we outline a system for generating three dimensional models of urban and rural areas in Fukushima Prefecture. The $$^{134}$$Cs and $$^{137}$$Cs radioactivity distribution can be set flexibly across the different components of the model. The models incorporate realistic representations of local buildings, based on nine common Japanese designs, individual conifer and broadleaf trees, and the topography of the land surface. Models are generated from Digital Elevation Model (DEM) and Digital Surface Model (DSM) datasets, and refined by users assisted with ortho-photographs of target sites. Completed models are exported from the system in a format suitable for the Particle and Heavy Ion Transport code System (PHITS) for the calculation of air dose rates and other radiological quantities. The system is demonstrated by modelling a suburban area 4 km from the Fukushima Daiichi Nuclear Power Plant that has yet to be decontaminated. Air dose rates calculated in PHITS were correlated with measurements taken across the site in a car-borne survey.

Journal Articles

Implementation of a resource handing environment for distributed applications on ITBL (IT-Based Laboratory)

Imamura, Toshiyuki; Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*

Keisan Kogaku Koenkai Rombunshu, 8(2), p.793 - 796, 2003/05

no abstracts in English

Journal Articles

Parallel molecular-dynamics simulation on ITBL

Shimizu, Futoshi; Kadoyoshi, Tomoko; Kaburaki, Hideo; Yamagishi, Nobuhiro*; Hasegawa, Yukihiro*; Higuchi, Kenji

Keisan Kogaku Koenkai Rombunshu, 8(2), p.801 - 804, 2003/05

no abstracts in English

Journal Articles

Application of ITBL basic software for virtual organizations

Higuchi, Kenji; Otani, Takayuki; Hasegawa, Yukihiro*; Suzuki, Yoshio; Yamagishi, Nobuhiro*; Kimura, Kazuyuki*; Maesako, Hiroshi*; Fukuda, Masahiro; Yagawa, Genki

Keisan Kogaku Koenkai Rombunshu, 8(2), p.797 - 800, 2003/05

no abstracts in English

Journal Articles

Grid computing supporting system on ITBL project

Higuchi, Kenji; Imamura, Toshiyuki*; Suzuki, Yoshio; Shimizu, Futoshi; Machida, Masahiko; Otani, Takayuki; Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Kimura, Kazuyuki*; Aoyagi, Tetsuo; et al.

Lecture Notes in Computer Science 2858, p.245 - 257, 2003/00

Prototype of the middleware for Grid project promoted by national institutes in Japan has been developed. Key technologies that are indispensable for construction of virtual organization were already implemented onto the prototype of middleware and examined in practical computer/network system from a view point of availability. In addition several kinds of scientific applications are being executed on the prototype system. It seems that successful result in the implementation of those technologies such as security infrastructure, component programming and collaborative visualization in practical computer/network systems means significant progress in Science Grid in Japan.

Journal Articles

A Visual resource integration environment for distributed applications on the ITBL system

Imamura, Toshiyuki*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*; Hasegawa, Yukihiro*; Higuchi, Kenji; Nakajima, Norihiro

Lecture Notes in Computer Science 2858, p.258 - 268, 2003/00

no abstracts in English

Journal Articles

Development of a virtual research environment in ITBL project

Higuchi, Kenji; Otani, Takayuki; Hasegawa, Yukihiro*; Suzuki, Yoshio; Yamagishi, Nobuhiro*; Kimura, Kazuyuki*; Aoyagi, Tetsuo; Nakajima, Norihiro; Fukuda, Masahiro; Imamura, Toshiyuki*; et al.

Proceedings of International Conference on Supercomputing in Nuclear Applications (SNA 2003) (CD-ROM), 11 Pages, 2003/00

An experimental application of Grid computing was executed in ITBL project promoted by six member institutes of MEXT. Key technologies that are indispensable for construction of virtual organization were implemented onto ITBL Middleware and examined in the experiment from a view point of availability. It seems that successful result in the implementation and examination of those technologies such as security infrastructure, component programming and collaborative visualization in practical computer/network systems means significant progress in Science Grid in Japan.

Journal Articles

TME: A Distributed resource handling tool

Imamura, Toshiyuki; Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*

Recent Advances in Computational Science & Engineering, p.789 - 792, 2002/00

no abstracts in English

Journal Articles

Implementation of emergency system for radioactive source term estimation on global meta-computing environment and its real-time visualization

Muramatsu, Kazuhiro; Imamura, Toshiyuki; Kitabata, Hideyuki; Kaneko, Isamu; Takemiya, Hiroshi*; Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Hirayama, Toshio

Keisan Kogaku Koenkai Rombunshu, 6(1), p.241 - 244, 2001/05

no abstracts in English

Journal Articles

Worldwide metacomputing experiments at SC2000

Imamura, Toshiyuki; Muramatsu, Kazuhiro; Kitabata, Hideyuki*; Kaneko, Isamu*; Yamagishi, Nobuhiro*; Hasegawa, Yukihiro*; Takemiya, Hiroshi*; Hirayama, Toshio

Joho Shori Gakkai Kenkyu Hokoku 2001-ARC-142, p.49 - 54, 2001/03

no abstracts in English

JAEA Reports

Examination of concept of next generation computer progress report 1999

Higuchi, Kenji; Hasegawa, Yukihiro*; Hirayama, Toshio

JAERI-Review 2000-019, 70 Pages, 2000/12

JAERI-Review-2000-019.pdf:1.89MB

no abstracts in English

Journal Articles

Software environment for local area metacomputing

Takemiya, Hiroshi*; Imamura, Toshiyuki; Koide, Hiroshi; Higuchi, Kenji; Tsujita, Yuichi; Yamagishi, Nobuhiro*; Matsuda, Katsuyuki*; Ueno, Koichi*; Hasegawa, Yukihiro*; Kimura, Toshiya; et al.

Proceedings of 4th International Conference on Supercomputing in Nuclear Applications (SNA 2000) (CD-ROM), 16 Pages, 2000/09

no abstracts in English

Journal Articles

Distributed parallel application on a supercomputer cluster; Constructing a distributed parallel data analysis system for nuclear fusion plasma

Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*; Hirayama, Toshio; Shirai, Hiroshi; Shimizu, Katsuhiro; Ozeki, Takahisa

Keisan Kogaku Koenkai Rombunshu, p.365 - 368, 2000/05

no abstracts in English

JAEA Reports

TME (Task Mapping Editor): Tool for excuting distributed Parallel Computing; TME user's manual

Takemiya, Hiroshi*; Yamagishi, Nobuhiro*; Imamura, Toshiyuki; Ueno, Koichi*; Koide, Hiroshi; Tsujita, Yuichi; Hasegawa, Yukihiro*; Higuchi, Kenji; Matsuda, Katsuyuki*; Hirayama, Toshio

JAERI-Data/Code 2000-013, p.52 - 0, 2000/03

JAERI-Data-Code-2000-013.pdf:8.64MB

no abstracts in English

JAEA Reports

TME (Task Mapping Editor): Tool for executing distributed parallel computing; Design report on TME

Takemiya, Hiroshi*; Yamagishi, Nobuhiro*; Imamura, Toshiyuki; Ueno, Koichi*; Koide, Hiroshi; Tsujita, Yuichi; Hasegawa, Yukihiro*; Higuchi, Kenji; Matsuda, Katsuyuki*; Hirayama, Toshio

JAERI-Data/Code 2000-010, p.49 - 0, 2000/02

JAERI-Data-Code-2000-010.pdf:2.04MB

no abstracts in English

JAEA Reports

Development of FAME animation system

Hasegawa, Yukihiro*; Hamamatsu, Kiyotaka; Shirai, Hiroshi; Matsuda, Toshiaki; *; Itakura, Hirofumi*; *

JAERI-Tech 99-015, 27 Pages, 1999/02

JAERI-Tech-99-015.pdf:1.99MB

no abstracts in English

30 (Records 1-20 displayed on this page)