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초고진공중에 있어서 Tribo-Coating 막의 윤활특성
김형자,加藤康司,전태욱 釜山工業大學校 1993 論文集 Vol.35 No.-
In order to find out the optimum conditions for the thickness of in film and the matrix of lubri-cation material and the surface roughness of material to chance lubricating life and low friction coe-fficient, the relationship between the surface roughness of material and the thickness of In film and their tribological behavior was investigated several soft metals in pin-on-disk tests under repeated rubbing conditions. Base in thought that lubrication for space machine is very important and go developing over the world, in this study we suggest new lubricating, that is tribo-coating, that is able to prove to be powerful that has minimum friction coefficient 0.02 over the world from selec-ting optimum matrix of lubrication material between friction surface.
TRIBO-COATING FOR FRICTION CONTROL IN ULTRA HIGH VACUUM
Kato, Koji,Adachi, Koshi,Oyamada, Tomonaga ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
Effectiveness of in-situ friction assisted deposition technique named "tribo-coating" as practical solid lubrication method was clearly shown from the view point of friction coefficient. That is to say, under practical friction conditions of contact pressure and sliding velocity for space machine, effective value of friction coefficient less than 0.15 could be obtained by tribo-coating of indium. In addition, it was clear that the tribo-coating of indium could give a third to one fifth times smaller friction coefficient than that of conventional soft metal coating as solid lubricant. Furthermore, friction coefficient could be controlled to keep low by in-situ tribo-coating at stable friction condition could decrease friction coefficient comparison with that of the first tribo-coating. The minimum friction coefficient of 0.018 was observed by using second-tribo-coating of indium in the friction couple of silicon nitride against stainless steel.
Lubrication of Space Systems by Tribo-coating
Koji Kato 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
It is a time to introduce a new concept of lubrication to space systems. Minimum amount of lubricant should be supplied to a contact interface instead of preparing too much lubricant on surfaces on the earth. In situ controllable lubrication method is wanted to overcome unexpected tribe-troubles in space. Tribe-coating, which forms a thin solid film in ㎚-scale by vacuum deposition during friction, is a promising lubrication method for space.
( Kyoichi Kato ),( Ken Fukunaga ),( Koji Kamikozuru ),( Shinichiro Kashiwamura ),( Nobuyuki Hida ),( Yoshio Ohda ),( Naohisa Takeda ),( Koji Yoshida ),( Masaki Iimuro ),( Yoko Yokoyama ),( Risa Kikuya 대한소화기기능성질환·운동학회 2011 Gut and Liver Vol.5 No.1
Background/Aims: Infliximab (IFX), an antibody to tumor necrosis factor, (TNF)-α has effi cacy in treating Crohn`s disease (CD). However, knowledge of the potential effects of IFX on patients` immune profi les is lacking. The purpose of this study was to reveal the immunological effects of IFX. Methods: Twenty-two patients with a CD activity index (CDAI) of 194.2±92.9 and an average duration of disease of 3.26 months and 21 healthy controls were included. Patients were to have their fi rst IFX remission induction therapy with 3 infusions (5 mg/kg) at weeks 0, 2, and 6. Oral 5-aminosalicylic acid was the only ongoing medication in the patient population. Blood samples at baseline, 12 hours after the first infusion and at week 14 were labeled with anti-CD4/ CD25 antibodies for immunohistochemical measurement of regulatory T-cells (Treg). Serum cytokines and chemokines were measured by suspension array and ELISA. Results: CDAI signifi cantly decreased prior to the second IFX infusion (p<0.001). Clinical remission rates were 77.3% and 91% by the second and third infusions, respectively. At baseline, interleukin (IL)-6 (p<0.03), IL-8 (p<0.03), IL-10 (p=0.050), IL-13 (p<0.01), transforming growth factor-β1 (p<0.01), and ``regulated on activation, normal T cell expressed and secreted`` (RANTES) (p<0.01) were elevated in patients. After the initial IFX infusion, TNF-α (p<0.04), IL-6 (p<0.03), interferon (IFN)-γ (p<0.04), IFN-γ-inducible protein-10 (p<0.01), monocyte chemoattractant protein-1 (p<0.01), macrophage infl ammatory protein-1β (p<0.01), and RANTES (p<0.01) were decreased. IFX infusion was associated with an increase in Treg (p<0.01) and a decrease in the Th1 (IFN-γ)/Th2 (IL-4) ratio (p<0.03). Conclusions: IFX use was associated with restoration of the Th1/Th2 balance after a single infusion and seemed to promote induction of naive Th0 lymphocytes to Treg. This knowledge should have clinical relevance. (Gut Liver 2011;5:37-45)
Kyoichi Kato,Ken Fukunaga,Koji Kamikozuru,Shinichiro Kashiwamura,Nobuyuki Hida,Yoshio Ohda,Naohisa Takeda,Koji Yoshida,Masaki Iimuro,Yoko Yokoyama,Risa Kikuyama,Hiroto Miwa,Takayuki Matsumoto 거트앤리버 소화기연관학회협의회 2011 Gut and Liver Vol.5 No.1
Background/Aims: Infliximab (IFX), an antibody to tumor necrosis factor, (TNF)-α has effi cacy in treating Crohn’s disease (CD). However, knowledge of the potential effects of IFX on patients’ immune profi les is lacking. The purpose of this study was to reveal the immunological effects of IFX. Methods: Twenty-two patients with a CD activity index (CDAI)of 194.2±92.9 and an average duration of disease of 3.26months and 21 healthy controls were included. Patients were to have their fi rst IFX remission induction therapy with 3 infusions (5 mg/kg) at weeks 0, 2, and 6. Oral 5-aminosalicylic acid was the only ongoing medication in the patient population. Blood samples at baseline, 12 hours after the first infusion and at week 14 were labeled with anti-CD4/CD25 antibodies for immunohistochemical measurement of regulatory T-cells (Treg). Serum cytokines and chemokines were measured by suspension array and ELISA. Results:CDAI signifi cantly decreased prior to the second IFX infusion (p<0.001). Clinical remission rates were 77.3% and 91% by the second and third infusions, respectively. At baseline, interleukin (IL)-6 (p<0.03), IL-8 (p<0.03), IL-10 (p=0.050), IL-13(p<0.01), transforming growth factor-β1 (p<0.01), and ‘regulated on activation, normal T cell expressed and secreted’(RANTES) (p<0.01) were elevated in patients. After the initial IFX infusion, TNF-α (p<0.04), IL-6 (p<0.03), interferon (IFN)-γ(p<0.04), IFN-γ-inducible protein-10 (p<0.01), monocyte chemoattractant protein-1 (p<0.01), macrophage infl ammatory protein-1β (p<0.01), and RANTES (p<0.01) were decreased. IFX infusion was associated with an increase in Treg (p<0.01)and a decrease in the Th1 (IFN-γ)/Th2 (IL-4) ratio (p<0.03). Conclusions: IFX use was associated with restoration of the Th1/Th2 balance after a single infusion and seemed to promote induction of naïve Th0 lymphocytes to Treg. This knowledge should have clinical relevance.
Yoko Kato,Kuriko Kagitani-Shimono,Junko Matsuzaki,Ryuzo Hanaie,Tomoka Yamamoto,Koji Tominaga,Yoshiyuki Watanabe,Ikuko Mohri,Masako Taniike 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.3
Objective: The purpose of the present study was to clarify the relationship between white matter tracts and cognitive symptoms in children with high-functioning autism spectrum disorder (ASD). Methods: We examined the cognitive functions of 17 children with high-functioning ASD and 18 typically developing (TD) controls and performed diffusion tensor imaging (DTI) tractography. We compared the results between the groups and investigated the correlations between the cognitive scores and DTI parameters within each group. Results: The Comprehension scores in the ASD group exhibited a positive correlation with mean diffusivity (MD) in the forceps minor (F minor). In the TD group, the Comprehension scores were positively correlated with fractional anisotropy (FA) in the right inferior fronto-occipital fasciculus (IFO) and left anterior thalamic radiation (ATR), and negatively correlated with MD in the left ATR, radial diffusivity (RD) in the right IFO, and RD in the left ATR. Additionally, a positive correlation was observed between the Matching Numbers scores and MD in the left uncinate fasciculus and F minor, and RD in the F minor. Furthermore, the Sentence Questions scores exhibited a positive correlation with RD in the right inferior longitudinal fasciculus. Relative to TD controls, the specific tract showing a strong correlation with the cognitive scores was reduced in the ASD group. Conclusion: Our findings indicate that white matter tracts connecting specific brain areas may exhibit a weaker relationship with cognitive functions in children with ASD, resulting in less efficient cognitive pathways than those observed in TD children.