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Park, Y.-J.*; Sawada, Atsushi; Ozutsumi, Takenori*; Tanaka, Tatsuya*; Hashimoto, Shuji*; Morita, Yutaka*
Proceedings of 3rd International Conference on Discrete Fracture Network Engineering (DFNE 2022) (Internet), 8 Pages, 2022/00
Safety analysis for underground disposal facilities for high-level radioactive waste requires thorough understanding of long-term groundwater flow and nuclide migration processes in geologic media. In the coastal subsurface systems, groundwater flow is defined by the complex interactions between freshwater of meteoric origin and denser saline water from the sea. In addition, sea levels are expected to fluctuate significantly due to a transgression and regression of the sea over the millions of years for safety analysis. This study presents long-term evolution of groundwater environment such as salinity concentration and flow velocity with focus of the interaction between fractures and matrix blocks in regional and near-field scale analysis framework for groundwater flow and nuclide migration for underground disposal facilities in hypothetical fractured crystalline coastal systems.
Zhang, Y.*; Guo, H.*; Kim, S. B.*; Wu, Y.*; Ostojich, D.*; Park, S. H.*; Wang, X.*; Weng, Z.*; Li, R.*; Bandodkar, A. J.*; et al.
Lab on a Chip, 19(9), p.1545 - 1555, 2019/05
Times Cited Count：181 Percentile：99.69(Biochemical Research Methods)This paper introduces two important advances in recently reported classes of soft, skin-interfaced microfluidic systems for sweat capture and analysis: (1) a simple, broadly applicable means for collection of sweat that bypasses requirements for physical/mental exertion or pharmacological stimulation and (2) a set of enzymatic chemistries and colorimetric readout approaches for determining the concentrations of creatinine and urea in sweat, across physiologically relevant ranges. The results allow for routine, non-pharmacological capture of sweat across patient populations, such as infants and the elderly, that cannot be expected to sweat through exercise, and they create potential opportunities in the use of sweat for kidney disease screening/monitoring.
Bierwage, A.; Yun, G. S.*; Choe, G. H.*; Nam, Y.*; Lee, W.*; Park, H. K.*; Bae, Y.-S.*
Nuclear Fusion, 55(1), p.013016_1 - 013016_17, 2015/01
Times Cited Count：4 Percentile：17.35(Physics, Fluids & Plasmas)Jeong, S. H.*; Chang, D. H.*; Kim, T. S.*; In, S. R.*; Lee, K. W.*; Jin, J. T.*; Chang, D. S.*; Oh, B. H.*; Bae, Y. S.*; Kim, J. S.*; et al.
Review of Scientific Instruments, 83(2), p.02B102_1 - 02B102_3, 2012/02
Times Cited Count：25 Percentile：70.21(Instruments & Instrumentation)The first NB (neutral beam) injection system of the KSTAR tokamak was partially completed in 2010 with only 1/3 of its full design capability, and NB heating experiments were carried out during the 2010 KSTAR operation campaign. The ion source is composed of a JAEA bucket plasma generator and a KAERI large multi-aperture accelerator assembly. Before the beam injection experiments, characteristics of the ion source were investigated. A minimum beam divergence angle was 0.8 
. The ion species ratio was D
:D
:D
=75:20:5. The arc efficiency is more than 1.0 A/kW. In the 2010 KSTAR campaign, the deuterium NB power of 0.7-1.5 MW was successfully injected into the KSTAR plasma with the beam energy of 70-90 keV. L-H transitions were observed within a wide range of beam powers relative to a threshold value. In every deuterium NB injection, a burst of D-D neutrons was recorded, and increases in the ion temperature and the plasma stored energy were found.
Sumita, Junya; Fujita, Ichiro; Shibata, Taiju; Makita, Taiyo*; Takagi, Takashi*; Kunimoto, Eiji*; Sawa, Kazuhiro; Kim, W. J.*; Park, J. Y.*
IOP Conference Series; Materials Science and Engineering, 18(16), p.162010_1 - 162010_4, 2011/09
Times Cited Count：1 Percentile：50.93(Materials Science, Ceramics)For control rod element of Very High Temperature Reactor, carbon fiber reinforced carbon matrix composite (C/C composite) is one of the major candidate materials for its high strength and thermal stability. Since the crack propagation of the C/C composite is complicated, the fracture behavior is one of the most important subjects of the design methodology for the control rod with the C/C composite. In this study, in order to assess the Mode-II fracture behavior of the two-dimensional (2D-) C/C composite which has the layer structure of laminas composed of fibers and matrix, bending test with oxidized end notched flexure specimen was carried out. The interlaminar fracture toughness decreased with increasing the oxidation for the 2D-C/C composite. The oxidized matrix causes reduction of fracture toughness and the reduction ratio is dependent on the matrix type. The crack initiates at the boundary between fiber bundles and grows along them without breaking the fiber. It is thought that the cracks which were initiated at the interface between matrix and fiber were gathered into the voids in the boundary between fiber bundles, and then the crack grows up in the matrix.
Shibata, Taiju; Sumita, Junya; Makita, Taiyo*; Takagi, Takashi*; Kunimoto, Eiji*; Sawa, Kazuhiro; Kim, W. J.*; Jung, C. H.*; Park, J. Y.*
Nihon Kikai Gakkai Rombunshu, A, 76(764), p.383 - 385, 2010/04
no abstracts in English
Park, J.-H.*; Wakahara, Akihiro*; Okada, Hiroshi*; Furukawa, Yuzo*; Kim, Y.-T.*; Chang, H.-J.*; Song, J.*; Shin, S.*; Lee, J.-H.*; Sato, Shinichiro; et al.
Japanese Journal of Applied Physics, 49(3), p.032401_1 - 032401_5, 2010/03
Times Cited Count：1 Percentile：5.33(Physics, Applied)Chatake, Toshiyuki*; Shibayama, Naoya*; Park, S. Y.*; Kurihara, Kazuo; Tamada, Taro; Tanaka, Ichiro*; Niimura, Nobuo*; Kuroki, Ryota; Morimoto, Yukio*
Journal of the American Chemical Society, 129(48), p.14840 - 14841, 2007/12
Times Cited Count：26 Percentile：60.65(Chemistry, Multidisciplinary)Kim, K. Y.*; Hwang, Y. S.*; Park, J.-G.*; Torikai, Naoya*; Takeda, Masayasu; Han, S. W.*; Shin, S. C.*
Physica Status Solidi (B), 244(12), p.4499 - 4502, 2007/12
Times Cited Count：1 Percentile：6.35(Physics, Condensed Matter)We have investigated the effect of the field cooling on the exchange bias and the coercivity in an exchange-biased Fe/Cr(100) bilayer using SQUID magnetometer. After the field cooling, magnetization shifted upwards, indicative of surplus magnetic moments, which could be interpreted as an evidence of pinned and uncompensated Cr magnetic moments induced by the cooling field. Interestingly enough, we also discovered that not all the pinned and uncompensated spins seem to be involved in producing the exchange bias, although they contribute to increasing the coercivity and inducing the surplus magnetization.
Park, H.; Yamano, Norihiro; Maruyama, Yu; Moriyama, Kiyofumi; Yang, Y.; Sugimoto, Jun
Dai-35-Kai Nihon Dennetsu Shimpojiumu Koen Rombunshu, 3, p.803 - 804, 1998/00
no abstracts in English
Park, H.; ; Moriyama, Kiyofumi; Maruyama, Yu; Y.Yang*; Sugimoto, Jun
Proc. of 11th Int. Heat Transfer Conf. (Heat Transfer 1998), 6, p.69 - 74, 1998/00
no abstracts in English
Kikuchi, Kenji; Yong, D.*; Al Mazouzi, A.*; Jean, H.*; Maloy, S.*; Lindau, R.*; Park, J. Y.*; Gr
schel, F.*
no journal, ,
MEGAPIE (Megawatt Pilot Experiment) was successfully done in 2006. Components performance during high-energy proton beam bombardment under the liquid lead-bismuth flow will be studied to define ADS quality condition. Samples are cut from the spent target and distributed to collaborated organizations. PIE (Post Irradiation Experiment) will provide knowledge on materials quality evaluated by design, construction and operation. It is scheduled to pre-test in 2008-2009 and to do PIE in 2010 and 2011. Before conducting PIE round robin test is to be done in order to secure experiment technology level.
Shibata, Taiju; Sumita, Junya; Makita, Taiyo*; Takagi, Takashi*; Kunimoto, Eiji; Sawa, Kazuhiro; Park, Y.*; Kim, W. J.*; Jung, C. H.*
no journal, ,
no abstracts in English
Inamura, Yasuhiro; Nakajima, Kenji; Kajimoto, Ryoichi; Nakatani, Takeshi; Otomo, Toshiya*; Suzuki, Jiro*; Arai, Masatoshi; So, J.-Y.*; Park, J.-G.*
no journal, ,
We report the current status of software development for chopper spectrometer, 4SEASONS, AMATERAS, at Materials and Life Science Facility (MLF), J-PARC. This development work consists of several parts, i.e. the control system on spectrometer (data acquisition and devices), support for decisions of experimental conditions, sample environment (direction alignment), data reduction and visualization. On commissioning of spectrometers, using actual neutron beam, we have already utilized our software in the processes of obtaining neutron signals as event-by-event data, transforming them to histograms and visualizing the results. Especially, using event data, we have successfully demonstrate to visualize two-dimensional maps of dynamical structure factors measured with different incident energies simultaneously obtained by one measurements by multiple incident energy measurement on 4SEASONS.
Inamura, Yasuhiro; Nakajima, Kenji; Kajimoto, Ryoichi; Otomo, Toshiya*; Nakatani, Takeshi; Suzuki, Jiro*; Arai, Masatoshi; So, J.-Y.*; Park, J.-G.*
no journal, ,
We report the current status of software development for chopper spectrometers, 4SEASONS, and AMATERAS, at Materials and Life Science Facility (MLF), J-PARC. This development work consists of several parts, i.e. the control system on spectrometer (data acquisition and devices), support for decisions of experimental conditions, sample environment (direction alignment), data reduction and visualization. On commissioning of spectrometers, using actual neutron beam, we have already utilized our software in the processes of obtaining neutron signals as event-by-event data, transforming them to histograms and visualizing the results. Especially, using event data, we have successfully demonstrate to visualize two-dimensional maps of dynamical structure factors measured with different incident energies simultaneously obtained by one measurements by multiple incident energy measurement on 4SEASONS.
Inamura, Yasuhiro; So, J.-Y.*; Nakajima, Kenji; Park, J.-G.*; Kajimoto, Ryoichi; Nakatani, Takeshi; Suzuki, Jiro*; Otomo, Toshiya*; Arai, Masatoshi
no journal, ,
We report the current status of software development for inelastic spectrometers and its demonstration on 4SEASONS, high intensity chopper spectrometer, and AMATERAS, cold neutron disk-chopper spectrometer, at Materials and Life Science Facility (MLF), J-PARC. The software developed by current work consists of several parts, (1) the instrument control, (2) the informative visualization, (3) the commands sequence control, (4) the data reduction and (5) the data visualization. Resulted software has been already employed for actual measurements and by using it we have obtained significant results from neutron instruments at MLF. For example, we have successfully demonstrated to analyze and visualize several dynamical structure factors with different incident energies obtained simultaneously by one measurement at 4SEASONS. High flexibility of event-recorded data treated by the data reduction software has a large contribution to realize such a new technique for inelastic neutron scattering.
Inamura, Yasuhiro; So, J.-Y.*; Nakajima, Kenji; Park, J.-G.*; Nakatani, Takeshi; Kajimoto, Ryoichi; Otomo, Toshiya*; Suzuki, Jiro*; Arai, Masatoshi
no journal, ,
We report the current status of software development for high-intensity chopper spectrometer, 4SEASONS, and cold neutron disk-chopper spectrometer, AMATERAS, at Materials and Life Science Facility (MLF), J-PARC. Utilizing the products of these developments, a number of results on science already come up. However, we did not make use of a huge data from strong neutron source effectively because of a lack of some software for users to treat them. By the progress of latest developments, the software environment around users gradually becomes better, especially on executing many measurements and analysis with different sample orientation or measurement with many temperature steps.
Hinoki, Tatsuya*; Park, Y.*; Park, J.*; Miwa, Shuhei; Donomae, Takako
no journal, ,
Nitride fuel and oxide fuel are candidate for helium gas-cooled fast reactor to achieve thermal efficiency over 40%. The conceptual design of fuel, which consists of nitride fuel of around 50%, highly dense SiC matrix and porous SiC buffer layers is encouraged according to the eport for "Feasibility Study on Commercialized Fast Reactor Cycle System (FS)", Japan. However there is no technique to form dense SiC in the small gap between fuels with accurate arrangement of fuels. The objective of this work is to develop basic fabrication technique for the high burn-up fuel utilizing forming technique for highly dense NITE-SiC/SiC composites. The cylindrical fuel is proposed in this work instead of spherical fuel to achieve high dense fuel and accurate arrangement.
Inamura, Yasuhiro; Nakatani, Takeshi; Nakajima, Kenji; Kajimoto, Ryoichi*; Ikeuchi, Kazuhiko*; Otomo, Toshiya*; Suzuki, Jiro*; So, J.-Y.*; Park, J.-G.*; Arai, Masatoshi
no journal, ,
We report the current status of software development for chopper spectrometers at Materials and Life Science Experimental Facility (MLF), J-PARC. This development work consists of four parts mainly, i.e. the experiment control system on spectrometer (data acquisition and devices), support for decisions of experimental conditions, data reduction and visualization. Our software, named Utsusemi, has already been utilized in actual users measurements, while we are proceeding with developments for more effective use of high flux neutrons. Especially, we have successfully demonstrated a measurement of a single crystal of 3D spin system; several tens of measurements by rotating the sample, and visualization of the data forming intensity maps in large Q space. This has been achieved by development of software to perform automatic devices control (sample rotation and data acquisition) and to handle huge data for visualization.
Inamura, Yasuhiro; Nakajima, Kenji; Kajimoto, Ryoichi; Otomo, Toshiya*; Nakatani, Takeshi; Suzuki, Jiro*; Arai, Masatoshi; So, J.-Y.*; Park, J.-G.*; Perring, T.*; et al.
no journal, ,
We report the plan and current status of development for software used on high-intensity chopper spectrometer, 4SEASONS, and Cold Neutron Disk-Chopper Spectrometer, CNDCS, at Materials and Life Science Facility(MLF), J-PARC. We begin to design software packages based on many required functions for performing experiments and analysis, for example control spectrometer system (data acquisition, devices), suggestion of experiment conditions, visualization and so on. This project progresses with software company. On the other hand, we started to collaborate with Korean group about the development of analysis software for inelastic scattering. In this presentation, we will present the current status and plan for software development including collaboration with Korean group.
Inamura, Yasuhiro; Nakajima, Kenji; Kajimoto, Ryoichi; Arai, Masatoshi; So, J.-Y.*; Park, J.-G.*
no journal, ,
We report the current status of software development for high-intensity chopper spectrometer, 4SEASONS, and cold neutron disk-chopper spectrometer, AMATERAS, at Materials and Life Science Facility (MLF), J-PARC. Our development consists of several parts, i.e. the control system on spectrometer (data acquisition and devices), support for decisions of experimental conditions, sample environment (direction alignment), data reduction and visualization as shown in figure. In 4SEASONS, we had started the measurement for commissioning on beam since last September. Using the product of our development, we tested that many functions going well, i.e. transporting from the event data to histogram, plotting the data and control devices. In this presentation, we will present the current status and plan for software development including collaboration with Korean group.
