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ODS Ferritic / Martensitic 강의 고온강도 특성
윤한기(H. K. Yoon),A Kimura 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Oxide dispersion strengthened(ODS) materials for structural application in fusion reactors world allow to increase the operating temperature to approximately 650℃. A micro-structural analysis and tensile test were performed on three ODS ferritic/martensitic steels between R.T. and 600℃. Dispersion hardening represents an interesting approach to improve the mechanical properties at elevated temperature, as they are foreseen in the future fusion reactor. Three ODS variants of the 10Cr-ODS(K1), 13Cr-Al-ODS(K2) and 19Cr-Al-ODS(K4) with Y₂O₃ content of 0.37wt% have been produced. The micro-structure of compacted material has been characterized by means of optical and electron microscope(SEM). It has been successfully demonstrated that it is possible to expan the temperature range for the application of fusion reactor.
Woo, H.J.,Kang, H.K.,Nguyen, T.T.H.,Kim, G.E.,Kim, Y.M.,Park, J.S.,Kim, D.,Cha, J.,Moon, Y.H.,Nam, S.H.,Xia, Y.m.,Kimura, A.,Kim, D. IPC Science and Technology Press ; Elsevier Scienc 2012 Enzyme and microbial technology Vol.51 No.6
Novel ampelopsin glucosides (AMPLS-Gs) were enzymatically synthesized and purified using a Sephadex LH-20 column. Each structure of the purified AMPLS-Gs was determined by nuclear magnetic resonance, and the ionic product of AMPLS-G1 was observed at m/z 505 (C<SUB>21</SUB>H<SUB>22</SUB>O<SUB>13</SUB>.Na)<SUP>+</SUP> using matrix-assisted laser desorption ionization time-of-flight mass spectrometry. AMPLS-G1 was identified as ampelopsin-4'-O-α-d-glucopyranoside. The optimum condition for AMPLS-G1, determined using response surface methodology, was 70mM ampelopsin, 150mM sucrose, and 1U/mL dextransucrase, which resulted in an AMPLS-G1 yield of 34g/L. The purified AMPLS-G1 displayed 89-fold increased water solubility and 14.5-fold browning resistance compared to those of AMPLS and competitive inhibition against tyrosinase with a K<SUB>i</SUB> value of 40.16μM. This value was smaller than that of AMPLS (K<SUB>i</SUB>=62.56μM) and much smaller than that of β-arbutin (K<SUB>i</SUB>=514.84μM), a commercial active ingredient of whitening cosmetics. These results indicate the potential of AMPLS and AMPLS-G1 as superior ingredients for functional cosmetics.
木村菊二 가톨릭대학산업의학센타 산업의학연구소 1974 韓國의 産業醫學 Vol.13 No.3
대기는 질소, 산소, 기타의 기상의 가스체로 되어 있는 일정한 혼합물이다. 일반으로 이 일정한 혼합물이외의 물질이 점점증가하면 이것이 유해하게 작용한다. 유해작용으로는 인간건강에 대한 장해, 생산 공장에서는 기계, 장치, 제품에 손상을 입힌다. 이러한 일정한 혼합물이외의 물질이 혼합됐을 때 공기가 오염되어 있다고 한다. 공기오염물질에는 가스상(기체와 미세액상)과 입자상의 물질로 크게 나눌 수 있는데 오늘은 분진, 즉 입상물질에 관하여 말하고자 한다. 공기중에 부유하고 있는 분진 즉 입상물질이 우리들의 건강이나 혹은 생활에 어떠한 장해를 주는가? 우선 하늘을 보면 푸르게 보이거나 회색으로 보인다. 또 아침새벽이나 저녁 노을이 질때는 빨갛게 보여 대단히 아름답다. 이것은 대기중에 미세한 입자가 떠 있어서 이것이 태양광선을 받아 반사되어 그러한 색을 띠게 되는 것이다. 그러므로 대기중에 아무 물질도 부유되어 있지 않으면 푸른 하늘이란 있을 수 없는 것이며, 저녁 노을도 볼 수 없는 것이다. 그리고 비가 온다든가 안개가 낀다는 것도 공기중에 떠 있는 입상물질이 핵을 이루어 수증기가 이에 응결되기 때문이다. 즉 자연적으로 외기에는 적은 양이긴 하지만 입상물질이 항상 떠 있는 것이다.
Pedro R. F. Rende,Joel Machado Pires,Kátia Sakimi Nakadaira,Sara Lopes,João Vale,Fabio Hecht,Fabyan E. L. Beltrão,Gabriel J. R. Machado,Edna T. Kimura,Catarina Eloy,Helton E. Ramos 대한병리학회 2024 Journal of Pathology and Translational Medicine Vol.58 No.3
Background: Among other structures, nuclear grooves are vastly found in papillary thyroid carcinoma (PTC). Considering that the application of artificial intelligence in thyroid cytology has potential for diagnostic routine, our goal was to develop a new supervised convolutional neural network capable of identifying nuclear grooves in Diff-Quik stained whole-slide images (WSI) obtained from thyroid fineneedle aspiration. Methods: We selected 22 Diff-Quik stained cytological slides with cytological diagnosis of PTC and concordant histological diagnosis. Each of the slides was scanned, forming a WSI. Images that contained the region of interest were obtained, followed by pre-formatting, annotation of the nuclear grooves and data augmentation techniques. The final dataset was divided into training and validation groups in a 7:3 ratio. Results: This is the first artificial intelligence model based on object detection applied to nuclear structures in thyroid cytopathology. A total of 7,255 images were obtained from 22 WSI, totaling 7,242 annotated nuclear grooves. The best model was obtained after it was submitted 15 times with the train dataset (14th epoch), with 67% true positives, 49.8% for sensitivity and 43.1% for predictive positive value. Conclusions: The model was able to develop a structure predictor rule, indicating that the application of an artificial intelligence model based on object detection in the identification of nuclear grooves is feasible. Associated with a reduction in interobserver variability and in time per slide, this demonstrates that nuclear evaluation constitutes one of the possibilities for refining the diagnosis through computational models.
Photoluminescence of Modulation-Doped ZnSe:Te Grown by Using MBE
K. Imai,Y. Ichinohe,M. Kanamori,K. Kyoh,K. Honma,Na. Kimura,No. Kimura,T. Sawada,K. Suzuki,G. Shigaura 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Modulation-doped ZnSe:Te samples, which indicate quite strong emissions at 2.68 (S1) and 2.42 (S2) eV at low temperatures, have been grown by using MBE. The samples consist of a ZnSe-ZnTe superstructure with ultra-thin ZnTe layers. The sample, which has S1 and S2 emission bands simultaneously, has a carrier transfer process from the S1 to the S2 state. The process leads to a super-linear dependence of the intensity of the S1 emission on the excitation intensity. We predict that the S1 and the S2 band construct a double well potential in the sample which indicates both emissions simultaneously. Modulation-doped ZnSe:Te samples, which indicate quite strong emissions at 2.68 (S1) and 2.42 (S2) eV at low temperatures, have been grown by using MBE. The samples consist of a ZnSe-ZnTe superstructure with ultra-thin ZnTe layers. The sample, which has S1 and S2 emission bands simultaneously, has a carrier transfer process from the S1 to the S2 state. The process leads to a super-linear dependence of the intensity of the S1 emission on the excitation intensity. We predict that the S1 and the S2 band construct a double well potential in the sample which indicates both emissions simultaneously.
Measurements of Neutron-Capture Cross Sections of ^(244)Cm and ^(246)Cm at J-PARC/MLF/ANNRI
A. Kimura,K. Furutaka,S. Goko,H. Harada,T. Kin,F. Kitatani,M. Koizumi,S. Nakamura,M. Ohta,M. Oshima,Y. Toh,T. Fujii,S. Fukutani,J. Hori,K. Takamiya,M. Igashira,T. Katabuchi,M. Mizumoto,T. Kamiyama,K. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
For developments of innovative nuclear reactors, strong demands exist for the improvement of the accuracy of the neutroncapture cross sections of minor actinides (MAs) and long-lived fission products. We have constructed a Ge-spectrometer using the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC materials and life science experimental facility (MLF). Preliminary neutroncapture cross sections of ^(244)Cm and ^(246)Cm were obtained in the neutron energy range from 1.0 eV up to 300 eV.