• Title/Summary/Keyword: ODF2

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A Design of Optimal Satellite-Tracking Control System with Two-Degree-of Freedom for Communication Antenna Equipments (통신안테나 설비의 2자유도 체상 위상 추적 제어 시스템의 설계)

  • Hwang, Chang-Sun;Hwang, Hyun-Joon;Kim, Dong-Wan;Kim, Mun-Soo;Jeong, Ho-Seong
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.11 no.3
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    • pp.97-105
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    • 1997
  • The aim of this paper is to introduce a design technique of the Two-Degree-of-Freedom(TDF) satellite-tracking control system which has not only the robust stability for a unstructured uncertainty but also the robust performance for a structured uncertainty. This TDF system which can design the feedforward controller KI and the feedback one K independently is designed by , $\mu$-synthesis. The effectiveness of this TDF system is verified and compared with the One-Degree-of -Freedom(ODF) satellitetracking control system by computer simulation.

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Texture Development of Cold Rolled and T-6 Treated 7X1X Al-alloy with 0.1% Sc (0.1% Sc이 첨가된 7X1X Al-합금의 압연과 T-6열처리에 따른 집합조직의 발달)

  • Jea, C.W.;Jin, S.J.;Chung, D.S.;Lim, S.T.;Park, N.J.
    • Journal of the Korean Society for Heat Treatment
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    • v.17 no.2
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    • pp.101-105
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    • 2004
  • After extrusion, cold rolling and T-6 treatment, texture development of 7x1x Al-alloy with 0.1% Sc is studied. During extrusion the very strong <111>+weak <100> fiber texture is developed, which is Influenced on the formation of rolling texture. The texture after 80% cold rolling can be described by strong{112}<111>(Cu)+{123}<634>(S) component in the cross section of the extruded rod, the strong -fiber+weak{110}<001>(Goss) components in the longitudinal section, and the strong {110}<112>(Bs)+weak{001}<100>(Cube) components in the transverse section. The components of rolling texture are remained after T-6 treatment, but the maximum density of ODF is higher. The calculated mean r-values and the planar anisotropy are relatively high, which are dependent on the texture. After T-6 treatment, recrystallized equiaxed grains with average grain size of $1{\sim}2{\mu}m$ are obtained.

Structure and properties of ion beam deposited diamond-like carbon films (이온빔 합성법에 의해 증착된 다이아몬드성 카본 필름의 구조 및 특성)

  • 김성화;이광렬;은광용
    • Journal of the Korean Vacuum Society
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    • v.8 no.3B
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    • pp.346-352
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    • 1999
  • Diamond-like carbon (DLC) lims were deposited by using end hall type ion gun. Benzene gas was used for the generation of carbon ions. In order to systematically control the ion energy, we applied to the substrate DC, pulsed DC or 250 kHz medium frequency bias voltage, DLC films of superior mechanical properties of hardness 39$\pm$4 GPa and elastic mudulus 290$\pm$50GPa (2 to 6 times better than those of the films deposited by plasma assisted CVD method) could be obtained. Deposition rate was much higher than when using Kaufman type ion source, which results from higher ion beam current of end hall type ion gun. The mechanical properties and atomic bond structure were independent of the bias voltage type ion gun. The mechanical properties and atomic bond structure were independent of the bias voltage type but intimately related with the magnitude of the bias voltage. With increasing the negative bias voltage, the structure of the films changed to graphitic one resulting in decreased content of three dimensional inter-links. Degradation of the mechanical properties with increasing bias voltage could be thus understood in terms of the content odf three dimensional inter-links.

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Effect of thermo-mechanical treatment on fabrication of Ag tapes for YBCO coated conductor (차세대 선재 기판용 Ag 테이프의 제조공정에서 가공 열처리가 집합조직에 미치는 영향)

  • Lee, N.J.;Oh, S.S.;Park, C.;Song, K.J.;Ha, D.W.;Kwon, Y.K.;Ryu, K.S.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.04a
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    • pp.46-49
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    • 2002
  • The aim of this paper is to investigate the influence of various deformation ratio on texture of Ag tapes that can be used as a RE-$Ba_2Cu_3O_{7-{\delta}}$ coated conductor tapes without any buffer layer. We fabricated as-rolled Ag substrate with various deformation ratio per step. Thickness and total deformation ratio of Ag tapes were $100{\mu}m$ and >98%, respectively. And as-rolled Ag substrate was annealed at $750^{\circ}C$ for 30min. The as-rolled and recrystallization textures were measured using x-ray pole figures and orientation distribution function (ODF) analysis. With the increase of rolling ratio from 5 to 20%, deformation texture are changed from {1l0}<311> to {1l0}<112>, {032}<100>, {051}<211>. After recrystallization by annealing, main texture was observed to {013}<100> under present condition.

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Lactobacillus acidophilus and Lactobacillus crispatus Culture Supernatants Downregulate Expression of Cancer-testis Genes in the MDA-MB-231 Cell Line

  • Azam, Rosa;Ghafouri-Fard, Soudeh;Tabrizi, Mina;Modarressi, Mohammad-Hossein;Ebrahimzadeh-Vesal, Reza;Daneshvar, Maryam;Mobasheri, Maryam Beigom;Motevaseli, Elahe
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.10
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    • pp.4255-4259
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    • 2014
  • Lactobacilli are probiotics shown to have antitumor activities. In addition, they can regulate gene expression through epigenetic mechanisms. In this study, we aimed to assess anti tumor activities of Lactobacillus acidophilus and Lactobacillus crispatus on the MDA-MB-231 breast cancer cell line. The effects of culture supernatants were determined by MTT [3-(4,5-dimethylthiazol-2-y-2,5-diphenyltetrazolium bromide] assay. Changes in expression of 5 cancer-testis antigens (CTAs), namely AKAP4, ODF4, PIWIL2, RHOXF2 and TSGA10, were analyzed by quantitative real time RT-PCR. The culture supernatants of the 2 lactobacilli inhibited MDA-MB-231 cell proliferation. In addition, transcriptional activity of all mentioned CTAs except AKAP4 was significantly decreased after 24 hour treatment with culture supernatants. This study shows that Lactobacillus acidophilus and Lactobacillus crispatus have antiproliferative activity against MDA-MB-231 cells. In addition, these lactobacilli could decrease transcriptional activity of 4 CTAs. Previous studies have shown that expression of CTAs is epigenetically regulated, so it is possible that lactobacilli cause this expression downregulation through epigenetic mechanisms. As expression of CTAs in cancers is usually associated with higher grades and poor prognosis, downregulation of their expression by lactobacilli may have clinical implications.

Adverse effects of pesticide/metabolites on boar spermatozoa

  • Wijesooriya Mudhiyanselage Nadeema Dissanayake;Jung Min Heo;Young-Joo Yi
    • Korean Journal of Agricultural Science
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    • v.50 no.4
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    • pp.941-952
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    • 2023
  • The metabolites of agrichemicals, such as organophosphorus pesticides, are known to be more hazardous than their parent pesticides. 3,5,6-trichloro-2-pyridinol (TCP) is a major degradation product of chlorpyrifos, one of the organophosphate insecticides widely used in agriculture. In vivo or in vitro exposure to chlorpyrifos has been known to interfere with male reproductive functions, leading to reduced fertility in mammals. Therefore, this study was performed to examine the changes in the fertilization competence of boar spermatozoa exposed to TCP. Sperm samples were subjected to varying concentrations of TCP (10, 50, 100, 200 µM) and different periods of incubation. Sperm motility, motion kinematics, viability, acrosome integrity, intracellular reactive oxygen species (ROS) production, and gene expression levels (ODf2, ZPBP2, AKAP3 and AKAP4) were evaluated after exposure of the sperm to TCP. A significant dose-dependent reduction in motility was observed in sperm samples incubated with TCP compared to the controls after both incubation periods. Sperm viability was significantly decreased in samples incubated with 50, 100, and 200 µM TCP in both incubation periods. A significantly lower percentage of normal acrosomes and gene expression levels were observed in sperm samples exposed to 50, 100, and 200 µM TCP after both incubation periods, compared to the controls. There was a significant increase in the ROS production in spermatozoa incubated with 100 - 200 µM TCP after both incubation periods. Consequently, the direct exposure of boar spermatozoa to TCP interferes with sperm functions and leads to decreased fertilization. In order to identify and address the various causes of reproductive decline, the impact of chemical metabolites needs to be discussed in depth.

The Influence of W Addition on Cube Textured Ni Substrates for YBCO Coated Conductor (양축 정렬된 Ni 기판의 특성에 미치는 W 첨가의 효과)

  • Kim Kyu Tae;Lim Jun Hyung;Kim Jung Ho;Jang Seok Hern;Kim Ho-Jin;Joo Jinho;Kim Chan-Joong;Song Kyu Jung;Shin Hyung Sub
    • Progress in Superconductivity
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    • v.6 no.1
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    • pp.64-68
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    • 2004
  • We fabricated cube-textured Ni and Ni-W alloy substrates for coated conductors and characterized the effects of W addition on microstructure, mechanical strength, and magnetic properties of the substrate. Pure Ni and Ni-(2, 3, 5at.%)W alloys were prepared by plasma arc melting, heavily cold rolled and then annealed at various temperatures of $600-1300^{\circ}C$. The texture was evaluated by pole-figure and orientation distribution function (ODF) analysis. Mechanical properties were investigated by micro Vickers hardness and tension test. Ferromagnetism of the substrate was measured by physical property measurement system (PPMS). It was observed that Ni-W substrates had sharp cube texture, and the full-width at half-maximums (FWHMs) of in-plane texture was $^{\circ}$-5.57$4.42^{\circ}$, which is better than that of pure Ni substrate. In addition cube texture of Ni-W substrates was retained at higher temperature up to $1300^{\circ}C$. Microstructural observation showed that the Ni-W substrates had fine grain size and higher mechanical properties than the pure Ni substrate. These improvements are probably due to strengthening mechanisms such as solid solution hardening and/or grain size strengthening. PPMS analysis showed that addition of W effectively reduced saturation magnetization in applied magnetic field and Curie temperature.

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Fabrication of cube textured Au/Ni template using electoless-plating (무전해 도금법을 이용한 cube 집합조직을 가지는 Au/Ni template 제조)

  • Lim Jun Hyung;Kim Jung Ho;Jang Seok Hem;Kim Kyu Tae;Lee Jin Sung;Yoon Kyung Min;Joo Jinho;Kim Chan-Joong;Ha Hong-Soo;Park Chan
    • Progress in Superconductivity
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    • v.6 no.2
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    • pp.133-137
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    • 2005
  • We fabricated the Au/Ni template for YBCO coated conductors and evaluated texture formation and the microstructural evolution. The cube textured Ni substrate was fabricated by rolling and recrystallization annealing, and subsequently Au layer formed on the substrate by electroless-plating method. The texture was evaluated by pole-figure with x-ray goniometer with orientation distribution function (ODF) analysis. The surface roughness and grain boundary morphology of template were characterized by atomic force microscopy (AFM) We observed that Au layer deposited epitaxially on Ni substrate and formed a strong cube texture when plating time was optimized. The full-width at half-maximum (FWHM) was $8.4^{\circ}$ for out-of-plane and $9.98^{\circ}$ for in-plane texture for plating time of 30 min. Microstructural observation showed that the Au layer was homogeneous and dense without formation of crack/microcrack. In addition, we observed that root-mean-square (RMS) and depth of grain boundary were 14.6 nm and 160 $\AA$ for the Au layer, respectively, while those were 27.0 nm and 800 $\AA$ for the Ni substrate, indicating that the electoless-plated Au layer had relatively smooth surface and effectively mollified grain groove.

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Study on The Synthesis of The Ultra-Fine (Ni, Zn)-ferrite by The Hydrothermal Method and its $CO_2$ Decomposition (수열합성법에 의한(Ni, Zn)-Ferrites의 초미세분말 합성공정 및 $CO_2$분해 특성 연구)

  • Kim, Jeong-Sik;An, Jeong-Ryul;Ryu, Ho-Jin
    • Korean Journal of Materials Research
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    • v.10 no.3
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    • pp.223-226
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    • 2000
  • The oxygen deficient ferrites $(Ni_x,\; Zn_{1-x})Fe_2O_{4-{\delta}}$ can decompose $CO_2$ as C and $O_2$ at a low temperature of about $300^{\circ}C$. Ultra powders of $(Ni_x,\; Zn_{1-x})Fe_2O_4$ for the $CO_2$ decomposition were prepared by the hydrothermal methods. The XRD result of synthesized ferries showed the spinel structure of ferrites and ICP-AES and EDS quantitative analyses showed the composition similar with the starting molar ratios of the mixed solution prior to reaction. The BET surface area of the synthesized(Ni, Zn)-ferrites was above $110\textrm{m}^2/g$ and its particle size was very as small as about 5~10 nm. The $CO_2$ decomposition efficiency of the oxygen deficient ferrites($(Ni_x,\;Zn_{1-x})Fe_2O_{4-{\delta}}$) was almost independent with composition and the $CO_2$ decomposition efficiency of ternary (Ni, Zn)-ferrites was better than of binary Ni-ferrites.

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Expression of receptors of Vitamin D and cytokines in osteoclasts differentiated by M-CSF and ODF (Macrophage Colony-Stimulating Factor와 Osteoclast Differentiation Factor로 분화 유도된 생쥐 파골세포에서 Vitamin D 및 수종의 싸이토카인 수용체의 발현)

  • Seong, Soo-Mi;Um, Heung-Sik;Ko, Sung-Hee;Woo, Kyung-Mi;Chang, Beom-Seok
    • Journal of Periodontal and Implant Science
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    • v.32 no.4
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    • pp.865-873
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    • 2002
  • The primary cause of tooth loss after 30 years of age is periodontal disease. Destruction of alveolar bone by periodontal disease is done by bone resorbing activity of osteoclasts. Understanding differentiation and activation mechanism of osteoclasts is essential for controling periodontal disease. The purpose of this study is to identify the possible effects of Vitamin D and cytokines affecting osteoclasts and its precursor cells. Four to six week-old mice were killed and humerus, radius, tibia and femur were removed aseptically and washed two times with Hank's solution containing penicillin-streptomycin and then soft tissue were removed. Bone marrow cells were collected by 22 gauge needle. Cells were cultured in Hank's solution containing 1 mg/ml type II collagenase, 0.05% trypsin, 41mM EDTA. Supernatant solution was removed 5 times after 15 minutes of digestion with above mentioned enzyme solution, and remained bone particles were maintained in alpha-MEM for 15 minutes and $4^{\circ}C$ temperature. Bone particles were agitated for 1 minute and supernatant solution containing osteoclast precursor cells were filtrated with cell stainer. These separated osteoclast precursor cells were dispensed with 100-mm culture dish by $1{\times}10^7$ cells unit and cultured in ${\alpha}$- MEM containing 20 ng/ml recombinant human M-CSF, 30 ng/ml recombinant human soluble osteoclast differentiation factor and 10% fetal calf serum for 2 and 7 days. Total RNA of osteoclast precursor cells were extracted using RNeasy kit. One ${\mu}g$ of total RNA was reverse transcribed in $42^{\circ}C$ for 30 minutes using SuperScriptII reverse transcriptase. Expression of transcribed receptors of each hormone and cytokine were traced with 1 ${\mu}l$ of cDNA solution by PCR amplification. Vitamin D receptor WAS found in cells cultured for 7 days. TNF-${\alpha}$ receptor was found in cells cultured for 2 days and amount of receptors were increased by 7 days. IL-1 type I receptor was not found in cells cultured 2 and 7 days. But, IL-1 receptor type II was found in cells cultured for 2 days. TGF-${\alpha},{\beta}$type I receptor was found in cells cultured 2 and 7 days, and amount of receptors were increased by 7 days of culture. These results implies Vitamin D and cytokines can affect osteoclasts directly, and affecting period in differentiation cycle of osteoclasts is different by Vitamin D and cytokines.