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Yoshiki Kimura,Yoshiki Matsui,TomokiYamaguchi 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
Nuclear security event involving nuclear and other radioactive materials outside of regulatory control (MORC) has the potential to cause severe consequences for public health, the environment, the economy and society. Each state has a responsibility to develop national nuclear security measures including nuclear forensics to respond to such events. In Japan, national nuclear forensics capability building efforts mainly based on research and development (R&D) have been conducted since 2010, in accordance with national statement of Japan at the Nuclear Security Summit in Washington DC. Most of that work is undertaken at the Integrated Support Center for Nuclear Non-proliferation and Nuclear Security (ISCN) of the Japan Atmic Energy Agency (JAEA) in close cooperation with other competent authorities. The ISCN has made increased contributions to the enhancement of international nuclear security by establishing technical capabilities in nuclear forensics and sharing the achievements with the international community. The ISCN has mainly engaged in R&Ds for establishing and enhancing nuclear forensics technical capability. As for the laboratory capability, several new pieces of analytical equipment have been introduced for nuclear forensics R&D purposes. High-precise measurement techniques validated in the past nuclear forensics incidents have been established, and novel techniques that can contribute to the more timely and confident nuclear forensics signature analysis have been developed. The ISCN has been also developed a proto-type nuclear forensics library based on the data of nuclear materials possessed for past nuclear fuel cycle research in JAEA. These technical capability developments have been conducted based on the cooperation with international partners such as the U.S. Department of Energy and EC Joint Research Center, as well as participation in exercises organized by Nuclear Forensics International Technical Working Group (NF-ITWG). Recent R&D works have been mainly based on the needs of domestic competent authorities, such as first responders and investigators, and aim to develop technologies covering the entire spectrum of nuclear forensics processes from crime scene investigation to laboratory analysis and interpretation. One important key issue is the enhancement of technical capability for post-dispersion nuclear forensics. For instance, the ISCN has carried out the development of radiation measurement equipment coupled with the low-cost and mobile radiation detectors that uses machine-learning algorithms for quick and autonomous radioisotope identification to support first responders during crime scene investigations. Laboratory measurement techniques for samples collected at a post-dispersion crime scene are also among the important technical issues studied at the ISCN. The application of emerging technologies to nuclear forensics has also been studied. This includes the application of deep leaning models to nuclear forensics signature interpretation that could provide more confident results, as well as the development of contamination imaging technology that could contribute to the analytical planning on the samples in collaboration with conventional forensics. Many analytical techniques have been developed and the capability to analyze nuclear and other radioactive materials for nuclear forensics purposes has been considerably matured over the past decade. The challenges of post-dispersion samples, collaboration with conventional forensics and the development of novel signatures will be more important in the near future. Therefore, the ISCN will promote the R&Ds to further enhance the technical capabilities solving these issues. In addition, the ISCN is also promoting to expand the nuclear forensics research into universities and other research institutes in Japan. This is expected to contribute to the establishment of a domestic nuclear forensics network that enables to respond timely and flexibly to the MORC incidents, and to the maturation of nuclear forensics as a new academic field.
Yoshiki Nakamura 대한산업공학회 2010 Industrial Engineeering & Management Systems Vol.9 No.4
An enterprise must achieve both a sound organizational management and effective development of individual members while maintaining a balanced approach. Relative to this, there is a research field dubbed as Organizational Activation. However, there is a necessity to clarify various factors required for organizational activation and to propose a methodology for organization management. This study is an attempt to create a model from an organization-a University Seminar Class-and agents therein-the Students and the Teacher-with an assumed goal of advancing together toward the students" self-growth. The model is expressed on two dimensional planes with vectors through a computer. Vectors are composed of the growth, demand, member, hindrance and student vectors. These vectors provide data to the mathematical model for a simulation. Each agent provided the individual information from the questionnaire-conducted to 169 university students. From the analysis data and extrapolations, this study was able to craft a guideline for future seminar activity. It also examines the possibility of assimilation of the Questionnaire Approach and that of the Computational Organization Theory approach. Finally, this study discusses the future possibility of application of the Assimilated Method for research and development, and for project management.
Topological Aspects and Transport Properties of Edge States in the Multi-band Superconductor Sr2RuO4
Yoshiki Imai,Katsunori Wakabayashi,Manfred Sigrist 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Motivated by the spin-triplet superconductor Sr2RuO4, we investigate the edge states by using atwo-band tight-binding model with interorbital hybridization and spin-orbit coupling. In particularwe focus on the topological aspects and the transport properties in the chiral spin-triplet superconductingphase. The Fermi surfaces correspond to the ones of Sr2RuO4 where the and the bandshave hole- and electron-like characters, respectively. Although a full quasiparticle excitation gapis present in the bulk system, gapless edge states appear and affect both the spin and the chargecurrents. We study the interplay between electron- and hole-like particles in the formation of theseedge states and edge currents. Topologically the two bands compensate for each other such that theedge state is not topologically protected. The repulsive interaction yields a spin polarization nearthe edges and lifts the degeneracy of the subgap edge states. The net spontaneous magnetizationgenerated through both the edge charge current and the spin polarization may be small due to cancelingeffects. The lifting of the spin degeneracy could likely be detected by quasiparticle tunnelingfor the surface density of states.
Wide Residual Networks for Semantic Segmentation
Yoshiki NAKAYAMA,Huimin LU,Yujie LI,Hyoungseop KIM 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
In the task of object recognition, convolutional neural networks (CNNs) have achieved high performance. In addition, these CNNs are also applied to the field of semantic image segmentation. However, applying the classification models to semantic segmentation tasks has a problem, lack of global context and reduction in resolution. In this work, we propose global context module and high resolution path in order to solve above problems. By simply combining them with an existing classification model (wide residual networks), our methods yield high-accuracy segmentation models. Our proposed approaches produce competitive results, the mean intersection over union (IoU) 67.6% and global accuracy 91.1%, on CamVid test set.
Effect of the Annealing Temperature of P(VDF/TrFE) Thin Films on their Ferroelectric Properties
Yoshiki Yachi,Takeshi Yoshimura,Norifumi Fujimura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
The effect of annealing temperature on the micro and the crystal structures and the ferroelectric properties of poly(vinylidene fluoride/trifluoro ethylene)(P(VDF/TrFE)) thin films was investigated. The X-ray diffraction results indicated that the crystallization of the film was enhanced at an annealing temperature above 100 ℃. On the other hand, the remnant polarization was increased by annealing at temperatures between 130 and 140 ℃. Therefore, the ferroelectric properties of the P(VDF/TrFE) films were formed to be improved by annealing at temperatures above Tc (123 ℃). The surface morphology and the piezoelectric responses were observed by scanning probe microscopy. The results indicated that small primary grains of P(VDF/TrFE) grew up to large secondary grains with increasing annealing temperature and that some of the small primary grains had large piezoelectric responses.
Ultrasound Measurements on the Skutterudite Compound SmOs4P12
Yoshiki Nakanishi,Gen Koseki,Dai Tamura,Kohei Kurita,Takeshi Saito,Minoru Koseki,Mitsuteru Nakamura,Masahito Yoshizawa,Yuya Koyota,Chihiro Sekine,Takehiko Yagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have investigated the elastic properties of the Sm-based filled skutterudite compoundSmOs4P12 for the first time. The measurements were performed on polycrystalline samples preparedat high temperatures and high pressures by using a wedge-type, cubic anvil, high-pressureapparatus. A clear and steep decrease was observed at an antiferromagnetic transition temperatureof 4.5 K in the temperature dependence of both the longitudinal and the transverse elastic constants. Absence of a precursor behavior reminds us of the multipolar ordering, possibly octupolarordering, observed in the isostructural system SmRu4P12. The transition is robust against an externalmagnetic field. We argue that the low-lying degenerate levels derived from the 4f-multipletground state of the Sm ion is split by the crystalline electric field in SmOs4P12. Furthermore, wediscuss the phononic properties, which include the ionic degrees of freedom for the rattling motion,and compare them with the values for other isostructural systems.