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黃元國,市橋秀友 慶熙大學校 1986 論文集 Vol.15 No.-
An axiomatic approach to fuzzy measure is presented via the concept of triangular norm(t-norm for short). Fuzzy measures are actually set functions which are monotonic with respect to set inclusion. Triangular norm and conorm are semi-groups of the unit interval. Based on the proposed fuzzy measures, AND, OR and NOT gates of fault tree are defined, and fuzzy membership function for component reliability is suggested for the future nesearch on the fuzzy fault tree analysis.
Yamashita, Hiromi,Kawasaki, Shinichi,Ichihashi, Yuichi,Takeuchi, Masato,Harada, Masaru,Anpo, Masakazu,Louis, Catherine,Che, Michel 한국화학공학회 1998 Korean Journal of Chemical Engineering Vol.15 No.5
Titanium-silicon (Ti/Si) binary oxides having different Ti content were prepared by the sol-gel method and utilized as photocatalysts for the hydrogenation and hydrogenolysis of CH₃CCH with H₂O. The photocatalytic reactivity and selectivity of these catalysts were investigated as a function of the Ti content and it was found that the hydrogenolysis reaction (C₂H_6 formation) was predominant in regions of low Ti content, while the hydrogenation reaction (C₃H_6 formation) proceeded in regions of high Ti content. The in situ photoluminescence, diffuse reflectance absorption, FT-IR, XAFS (XANES and EXAFS), and XPS spectroscopic investigations of these Ti/Si binary oxides indicated that the titanium oxide species are highly dispersed in the SiO₂ matrices and exist in a tetrahedral coordination exhibiting a characteristic photoluminescence spectrum. The charge transfer excited state of the tetrahedrally coordinated titanium oxide species plays a significant role in the efficient photoreaction with a high selectivity for the hydrogenolysis of CH₃CCH to producea mainly C₂H_6, and CH₄, while the catalysts involving the aggregated octahedrally coordinated titanium oxide species show a high selectivity for the hydrogenation of CH₃CCH to produce C₃H_6, being similar to reactions of the powdered TiO₂ catalysts. The good parallel relationship between the yield of the photolumunescence and the specific photocatalytic reactivity of the Ti/Si binary oxides as a function of the Ti content clearly indicates that the high phatocatalytic reactivity of the Ti/Si binary oxides having low Ti content is associated with the high reactivity of the charge transfer excited state, of the isolated titanium oxide species in tetrahedral coordination, [Ti^(3+)-O^-]^*.
Automatic Adaptive Space Segmentation for Reinforcement Learning
Komori, Yuki,Notsu, Akira,Honda, Katsuhiro,Ichihashi, Hidetomo Korean Institute of Intelligent Systems 2012 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.12 No.1
We tested a single pendulum simulation and observed the influence of several situation space segmentation types in reinforcement learning processes in order to propose a new adaptive automation for situation space segmentation. Its segmentation is performed by the Contraction Algorithm and the Cell Division Approach. Also, its automation is performed by "entropy," which is defined on action values’ distributions. Simulation results were shown to demonstrate the influence and adaptability of the proposed method.
The role of antioxidant and DNA damage in the UVB-induced skin tumors of hairless mice
Bito, Toshinori,Budiyanto, Arief,Ueda, Masato,Ichihashi, Masamitsu Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Oxidative stress evoked hy Ultraviolet (UV) exposure has been suggested to be involved in UV-induced skin carcinogenesis. In this study, the role of oxidative stress in UV-carcinogenesis was evaluated by applying N-Acetylcysteine (NAC) in animal model of hairless-mouse. NAC is known to be a precursor of glutathione, which was converted to glutathione in cytoplasm, acting as an intracellular free radical scavenger. The glutathione levels in hairless mouse skin after one time application of NAC increased significantly. With and without the pre-treatment of NAC, hairless-mice were exposed to UVB three times a week, at total dose 274.4 kJ in 80 times, and the timing of tumor-development, incidence of skin tumor and the histopathology of tumors were observed. 8-hydroxy-2'-deoxyguanosine (8-0HdG), a typical form of oxidative damage in DNA has been also investigated in the course of experiment. The decrease of 8-0HdG formation of UVB- exposed skin compared to controls was observed in the early stage of experiment in the NAC-treated mice. In addition, initial tumor development delayed significantly in NAC-treated group. Finally the number of the tumor developed in the NAC-treated mice was fewer though not significant. These results suggest that antioxidants may have inhibitory effect in the initial step of UVB-induced carcinogenesis of hairless mice.
Automatic Adaptive Space Segmentation for Reinforcement Learning
Yuki Komori,Akira Notsu,Katsuhiro Honda,Hidetomo Ichihashi 한국지능시스템학회 2012 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.12 No.1
We tested a single pendulum simulation and observed the influence of several situation space segmentation types in reinforcement learning processes in order to propose a new adaptive automation for situation space segmentation. Its segmentation is performed by the Contraction Algorithm and the Cell Division Approach. Also, its automation is performed by “entropy,” which is defined on action values’ distributions. Simulation results were shown to demonstrate the influence and adaptability of the proposed method.