• Title, Summary, Keyword: green lamination

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광식각 기술을 이용한 미세라인의 형성 및 Series Resonator의 구현

  • 박성대;조현민;이영신;이우성;박종철
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.151-156
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    • 2001
  • Using the photoimageable thick film conductors, $25\mu\textrm{m}$ line widths and $25\mu\textrm{m}$ spaces can be obtained. Test patterns are made by green tape lamination, paste printing, exposing to UV light, developing in an aqueous process and cofiring. Postfiring method using alumina substrate can be also applied to fine line formation. Series gap resonator formed by photopatterning process showed the improved signal transmission characteristics compared to that obtained by conventional screen printing.

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Aging and destruction of PMN-PZT Multilayer Ceramic Actuators (PMN-PZT 세라믹 액츄에이터의 열화 및 파괴 거동)

  • Koh, Jung-Hyuk;Jeong, Soon-Jong;Ha, Moon-Su;Lee, Dong-Man;Song, Jae-Sung
    • Proceedings of the KIEE Conference
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    • pp.1424-1426
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    • 2003
  • PMN-PZT 적충형 세라믹 액츄에이터 소자를 제작한후 그 열화 특성을 조사하였다. 액츄에이터는 tape casting 방법으로 green sheet를 제작한후, screen printing방법을 이용하여 전극형상을 만들고, lamination과 cutting공정을 통하여 소자를 제작하였다. 작된 소자의 구조적인 특성을 분석하기 위하여 X-ray diffractometer를 사용하였으며, Doppler effect를 사용하는 laser vibrometer를 이용하여 전압에 따른 변위량을 측정하였다. 제작된 소자의 열화 특성을 알아보기 위하여 60 Hz의 triangular 교류 파형을 적충형 세라믹 액츄에이터에 인가하여 열화전과 후의 P-E hysteresis loop의 변화를 살펴보았으며, unipolar AC 전압을 지속적으로 인가하여 소자를 depling 시킴으로써 열화현상을 관찰하였다. 파단면에 대한 SEM 분석을 통하여 소자의 파괴 메카니즘을 알아 보도록 하였다. 이로부터 전기적, 기계적 열화가 소자의 동작에 미치는 영향에 대해서 알아 보았다.

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Carbonate Coatings on Plant Twigs Found from a Travertine-Depositing Small Stream, Dijon, France

  • Lee, Seong-Joo;Kong, Dal-Yong;Golubic, Stjepko
    • Journal of the Korean earth science society
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    • v.35 no.5
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    • pp.305-312
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    • 2014
  • A number of coated grains (spherical to elongated ones in shape) were collected from a small stream, Dijon, France. They were characterized by typical concentric lamination surrounding broken twigs, and were thus identified as concentric precipitation on plant twigs. Within carbonate coatings of the plant twigs, two morphological groups including, eukaryotic green algae (Vaucheria sp.) and cyanobacteria (Scytonema sp. and Rivularia sp.) were detected, which form carbonate crystals that are surrounding their filaments. The filaments could have triggered carbonate precipitation by photosynthetic removal of $CO_2$ causing the increase of alkalinity of the water, and by supporting their sheaths as nucleation sites. Such encrusted twigs were found from 70 meters downstream, in which temperature and pH were measured as $11.1^{\circ}C$ and 8.18, respectively. These water chemistries ($11.1^{\circ}C$ and pH 8.18), with the aid of microbial photosynthesis, were likely to provide a suitable condition for carbonate precipitation on the twigs.

The Preparation of NiCuZn Ferrite Slurry Using the Water Mixed Binder System (수계 바인더를 이용한 NiCuZn Ferrite의 슬러리 제조)

  • 류병환;이정민;고재천
    • Journal of the Korean Institute of Resources Recycling
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    • v.7 no.4
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    • pp.35-42
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    • 1998
  • Surface mount technology is the biggest theme in the area of deιIronic component. To miniatunze an electronic component, s such as ferrite chip inductor, the cer뼈lic wet process for green-sheet lamination and/or screen printing method through a s solvent medium system is widely used. The preparation and characterization of NiCuZn Ferrite (NCZF) shurry and the green s sheet using the water mixed binder system has been studied. The 21 vol% of NCZF slurry was prepared by a ball milling. The p polyacrylic vinyl copolymer (Mw; 60,000) was used as a binder. Th$\xi$ mixture of distilled water, isopropyl alcohol (IPA) and 2l butoxy ethanol was used as a dispersion medium. The water content of medium varied from about 40% to 80%. As the results. Thc disp$\xi$rston stability of the NCZF slurry was attributed to the free polymer rather than the electrostatic force of the particle. T The viscosity of the NCZF slurry was greatly depended on the ratio of water content in the medium.

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4.1' Flexible Organic Light Emitting Diodes Driven by Organic Thin-Film Transistors

  • Hu, Tarng-Shiang;Wang, Yi-Kai;Lin, Tsung-Hsien;Yan, Jing-Yi;Lee, Tzu-Wei;Yu, Chien-Hsien;Wen, Jiing-Fa;Kao, Chi-Jen;Chen, Liang-Hsiang;Shen, Yu-Yuan;Yeh, Shu-Tang;Tseng, Mei-Rurng;Wu, Po-Sheng;Ho, Jia-Chong;Lee, Cheng-Chung
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.314-316
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    • 2006
  • In this paper, the plastic organic thin-film transistors (OTFTs) with $32{\ast}32$ array are presented. Flexible organic light emitting diodes (OLEDs) operated by OTFTs are fabricated with a novel lamination method and the results are also presented. OTFT pixels defined by photolithography, and pentacene deposited by thermal evaporation. Fabrication method and the performances of green PHOLEDs with high efficiency, stability, and electrical performance are discussed.

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Rod-shaped Stromatolites from the Jinju Formation, Sacheon, Gyeongsangnam-do, Korea (경상남도 사천시 진주층에서 산출되는 막대기형 스트로마톨라이트)

  • Choi, Chong-Geol
    • Journal of the Korean earth science society
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    • v.28 no.1
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    • pp.54-63
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    • 2007
  • The sedimentary sequence of the non-marine Cretaceous Jinju Formation from Sacheon, Korea, contains a number of rod-shaped stromatolites (RSS) characterized by concentric lamination with curd-shaped, stratiform, and small columnar stromatolites. Unlike the world trend, a massive distribution of rod-shaped stomatolite was discovered in the region. The mineral composition, diagenetic alteration, and weathering process of the kind were analyzed by EPMA. The gross morphology of RSS is almost identical to broken plant twigs or stems formed by microbial activity onto which it grew. RSSs are interpreted as stromatolitic algae over plant twigs, which formed through concentric carbonate precipitation by epiphytic algal photosynthesis. The distribution of localities and horizons of the stromatolite imply that RSS is allochthonous and autochthonous. Two types of cyanobacterial filaments and one type of peen algal filament were discovered. The size frequency distribution of calcified filamentous microfossils found in stromatolite was $2.2{\mu}m\;and\;7.8{\mu}m$ in mean diameter of the former, $32.3{\mu}m$ in mean diameter of the latter. The cyanobacterial fossils played a key role in the formation of stromatolite, while the green algal filament was auxiliary stromatolite-builder stromatolites. The filamentous microfossils including trichome were found within the stromatolitic laminae.

Transplantation of Marrow Stromal Cells into the Developing Mammal Retina (발생 중인 포유류 망막으로 골수기질세포의 이식)

  • Lee, Eun-Shil;Kwon, Oh-Ju;Ye, Eun-Ah;Jeon, Chang-Jin
    • Journal of Korean Ophthalmic Optics Society
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    • v.18 no.4
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    • pp.541-548
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    • 2013
  • Purpose: Marrow stromal cells (MSCs) have been known for their potential to trans-differentiate into neural and glial cells in vitro and in vivo. To investigate the influence of the developing host environment on the survival and morphological and molecular differentiation, murine MSCs transplanted into the eye of Brazilian opossum (Monodelphis domestica). Methods: Enhanced green fluorescent protein (GFP) - expressing MSCs were transplanted into developing Brazilian opossums. Animals were allowed to survive for up to 4 weeks after transplantation, at which time the eyes were prepared for immunohistochemical analysis. Results: Some transplanted MSCs survived and showed morphological differentiation into neural cells with some processes within the host vitreous chamber. Some transplanted cells expressed class III ${\beta}$-tubulin (TuJ1, a marker for neuronal cells) or glial fibrillary acid protein (GFAP, a marker for glial cells) or Nestin (a marker for neural stem cells). In addition, some transplanted cells were located in ganglion cell layer but did not show morphological and molecular differentiation. Conclusions: Our result show that the most effective stage of development for transplantation into the retina was postnatal day 16, which retinas developmentally corresponded to postnatal day 4-5 days mouse retina based on cell differentiation and lamination patterns. The present findings suggest that the age of the host appears to play a key role in determining cell fate in vivo.