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E ects of Film Type and Nanotopography of Wafers on Oxide CMP Characteristics
T.Katoh,B.G.Ko,J.H.Park,H.C.Yoo,J.G.Park,U.G.Paik 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.1
We investigated how the oxide lm deposition method (plasma-enhanced tetra-ethyl- orthosilicate (PETEOS) and high density plasma chemical vapor deposition (HDPCVD)) and the surface waviness of silicon wafers (nanotopography) impacted the oxide chemical-mechanical polishing (CMP) characteristics by using the lm thickness variation after CMP. We conrmed that the non-uniformity of the lm thickness after CMP clearly depended on the nanotopography and not on the lm type. We analyzed the power spectral densities of the nanotopography and the lm thickness variation after CMP. Between them, we found a clear relationship for wavelengths shorter than about 20 mm. We also showed that spectral analyses were useful techniques for quantitative interpretation of the relationship between the nanotopography and the oxide CMP characteristics.
핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성
윤한기(H.K.Yoon),김동현(D.H.Kim),이상필(S.P.Lee),박이현(Y.H.Park),공유식(Y.S.Kong),Y.Katoh,A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Reduced activation ferritic steel, JLF-1 steel (Fe-9Cr-2W-V-Ta), is one of the promising candidate<br/> materials for fusion reactor applications. Fracture toughness (JIC) and tensile tests were carried out at<br/> room temperature and elevated temperature (400 ℃). Two types of CT specimen were prepared to<br/> examine the effect of rolling direction on the fracture toughness of JLF-1 steel. Four types of tensile<br/> specimen were also prepared to investigate the property by the rolling direction and welding. The<br/> Micro Vickers hardness was measured at various distances of a cross section of the TIG joints of<br/> JLF-1 steel according to the heating history of each position. Finally, the fracture surface was observed<br/> by scanning electron microscopy (SEM).
Watanabe, K.,Sato, H.,Kobayashi, T.,Katoh, K.,Obara, Y. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.4
In order to estimate the availability of ruminally-protected Lys (RPLys) and Met (RPMet), quantitative changes of free Lys and Met in the total abomasal outflow and feces were determined in three Holstein heifers with a T-shaped duodenal cannula. RPLys was prepared by coating Lys with fat and RPMet with a pH-sensitive polymer. RPLys and RPMet containing 30 g of each amino acid were supplied together to heifers, and total abomasal outflow was collected hourly from the T-shaped duodenal cannula for a 48 h period. Collected abomasal outflows were fractionated into liquid and solid phases to measure free Lys and Met concentration. At 2 wk after total abomasal outflow sampling, heifers were supplied RPLys and RPMet together again, and total feces were collected every 12 h for a 3 d period t estimate excreted RPLys and RPMet in feces. The amounts of Lys and Met recovered from the liquid fractions of abomasal outflow were estimated to be $23.9{\pm}8.3%$ and $68.6{\pm}3.6%$ (p=0.008) of RPLys and RPMet ingested, respectively. Final intestinal disappearances of Lys and Met were estimated to be $49.5{\pm}2.6%$ and $78.2%{\pm}6.5%$ (p=0.015) of ingested RPLys and RPMet, respectively.
Suzuki, Y.,Hong, Y.H.,Song, S.H.,Ardiyanti, A.,Kato, D.,So, K.H.,Katoh, K.,Roh, Sang-Gun Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.9
Adipokines, adipocyte-derived protein, have important roles in various kinds of physiology including energy homeostasis. Chemerin, one of adipocyte-derived adipokines, is highly expressed in differentiated adipocytes and is known to induce macrophage chemotaxis and glucose intolerance. The objective of the present study was to investigate the changes of chemerin and the chemokine-like-receptor 1 (CMKLR1) gene expression levels during differentiation of the bovine adipocyte and in differentiated adipocytes treated with tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$), adiponectin, leptin, and chemerin (peptide analog). The expression levels of the chemerin gene increased at d 6 and 12 of the differentiation period accompanied by increased cytoplasm lipid droplets. From d 6 onward, peroxisome proliferator-activated receptor-${\gamma}2$ (PPAR-${\gamma}2$) gene expression levels were significantly higher than that of d 0 and 3. In contrast, CMKLR1 expression levels decreased at the end of the differentiation period. In fully differentiated adipocytes (i.e. at d 12), the treatment of TNF-${\alpha}$ and adiponectin upregulated both chemerin and CMKLR1 gene expression levels, although leptin did not show such effects. Moreover, chemerin analog treatment was shown to upregulate chemerin gene expression levels regardless of doses. These results suggest that the expression of chemerin in bovine adipocyte might be regulated by chemerin itself and other adipokines, which indicates its possible role in modulating the adipokine secretions in adipose tissues.
중성자 선량 측정을 위한 Bubble-Damage Polymer Detector의 개발
우 홍,加藤和明,강영호,김도성 대한방사선 방어학회 1988 방사선방어학회지 Vol.13 No.1
중성자선량측정을 위하여 방사선과의 상호작용으로 인한 과열된 액체의 기화를 원리로 하는 bubble-damage polymer detector를 개발하였다. acrylamide와 글리세린으로 만든 중합체에 과열상태의 Freon12 액체방울을 분산시켜 검출기를 제작하였으며 중성자 조사에 의해 형성된 기포는 즉각적인 육안관측이 가능하였다. 검출기의 중성자 감도는 Am-Be중성자에 대하여 4-7 bubbles/10μSv이었다. A bubble-damage polymer detector, which operation principles are based on vaporization of superheated liquid drops by interaction with radiations, is developed for neutron dosimetry. The detectors are fabricated by dispersing the superheated liquid drops of Freonl2 into transparent and elastic polymer made of acylamide and glycerine. The bubbles formed by neutron irradiation are immediately visible. The neutron sensitivity of the detectors is 4-7 bubbles/10μSv for Am-Be neutrons.