• Title/Summary/Keyword: Kwak Jong-seok

검색결과 106건 처리시간 0.03초

Improved Performance of Organic Light-Emitting Diodes Using Novel Hole-transporting Materials

  • Kim, Young-Kook;Hwang, Seok-Hwan;Kwak, Yoon-Hyun;Lee, Chang-Ho;Yi, Jeoung-In;Lee, Jong-Hyuk;Kim, Sung-Chul
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.758-761
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    • 2009
  • The electroluminescent devices with the phenylnaphthyldiamine HTMs as the hole-transporting layer were more efficient than that with the biphenyldiamine HTM 1. Particularly, the life-time of the device IV using HTM 2 is about two times longer than that of the reference device III with HTM 1 within the measured current density, indicating more effective recombination at the emitting layer of device IV.

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고온 초전도 케이블 절연을 위한 절연지의 인장응력 및 절연파괴 특성 (The Characteristics of Electrical Breakdown and Tensile Stress of Dielectric Paper for Insulation of HTS Cable)

  • 김영석;곽동순;김해종;김상현
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 춘계학술대회 논문집 초전도 자성체 연구회
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    • pp.61-64
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    • 2003
  • The degradation of the dielectric properties of insulating papers that were used under loaded conditions at cryogenic temperature was paid attention. Electrical and tensile stress properties of dielectric paper at cryogenic temperature have been investigated to optimum insulating design of high-Tc superconducting(HTS) cable. Tensile strength of PPLP in liquid nitrogen was high more than that of air, but tensile strain could know that decrease sharply. According as tensile strength increases, the breakdown stress of PPLP in liquid nitrogen was decreased.

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고무 재질 탄성 마운트의 비선형 대변형 거동 해석 (Non-linear Large Deformation Analysis of Elastic Rubber Mount)

  • 노인식;김종만;곽정석
    • 대한조선학회논문집
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    • 제45권2호
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    • pp.186-191
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    • 2008
  • A lot of equipments installed in ships must be isolated for relaxing the shock, vibration and noise using the elastic mounts. Most of the elastic mounts are made of the rubber, however it is not easy to design the effective rubber mount. Because, in general, the rubber has a non-linear constitutive characteristics especially for a large deformation. So, there are many difficulties to estimate the accurate structural response of rubber which is the basis of the shape design of the mounts. In this study, the detailed non-linear viscoelastic large deformation finite element analysis method was dealt with. And to verify validity of the present analysis scheme, the results were compared with experiments.

글린트 잡음에 대한 확장 강인 $H_{\infty}$ 필터 설계 (The Design of Extended Robust $H_{\infty}$ Filter for Glint Noise)

  • 곽기석;신종구;윤태성;박진배
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 D
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    • pp.1961-1963
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    • 2001
  • In a target tracking problem, the radar glint noise has non-Gaussian heavy-tailed distribution and will seriously affect the target tracking performance. In this study, an extended robust $H_{\infty}$ was developed which can significantly improve the tracking performance when glint noise is present. Through the computer simulations, the proposed filter showed superior and robust tracking performance compared with other extended Kalman filters.

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EFFECT OF PROLYL 4-HYDROXYLASE INHIBITOR HOE 077 AND ITS DERIVATIVES ON THE COLLAGEN SYNTHESIS IN HSC-T6 CELLS

  • Joo, Yang-Hee;Jung, Seung-Hyun;Kim, Hyun-Jung;Lee, Eung-Seok;Yi, Jung-Bum;Lee, Namkyu;Cho, Yong-Baik;Kwak, Wie-Jong;Dong, Mi-Sook
    • 한국독성학회:학술대회논문집
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    • 한국독성학회 2002년도 Molecular and Cellular Response to Toxic Substances
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    • pp.161-161
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    • 2002
  • The abnormal accumulation of collagen is progressive and often results in impairment of liver function, i.e. liver cirrhosis. Collagen synthesis requires several posttranslational events. Prolyl 4-hydroxylase is the key enzyme in collagen synthesis that catalyzes the hydroxylation of peptide-bound proline residues to 4-hydroxyroline.(omitted)

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Structure-Related Cytotoxicity and Anti-Heaptofibric Effect of Asiaticoside Derivatives in Rat Hepatic Stellate Cell Line, Hsc-T6

  • Kim, Jeong-Ran;Jung, Seung-Hyun;Lee, Eung-Seok;Lee, Eun-Joo;Yi, Jung-Bum;Lee, Namkyu;Cho, Yong-Baik;Kwak, Wie-Jong;Park, Young-In
    • 한국독성학회:학술대회논문집
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    • 한국독성학회 2003년도 추계학술대회
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    • pp.171-171
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    • 2003
  • Asiaticoside, a biologically active triterpenoid present in Centella asicatica, has been known to exert a variety of biological effect such as wound-healing, hepatoprotective, anti-inflammatory. In this study, we observed the effect of asiatic acid asiaticoside and its 16 derivatives on the cytotoxicity and the content of hydroxyproline in rat hepatic stellate cell line, HSC-T6 cell as a preliminary study for screening the anti-hepatofibrotic effect.(omitted)

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EMS 메모리 데이터베이스 동기화 기능 개선 개발

  • 김태섭;곽종갑;이석찬
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2015년도 추계학술발표대회
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    • pp.1131-1133
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    • 2015
  • EMS(Energy Management System)는 우리나라 전체 전력 계통을 실시간으로 감시, 제어하고 계통 주파수를 자동으로 조정하여 성능 최적화를 유도하는 시스템으로 전력 계통의 두뇌와 같은 역할을 한다. 본 연구에서는 차세대 EMS(Next Generation Energy Management System: NG-EMS)에서 Enable과 Standby 서버 간 데이터베이스 동기화 기능 개선 개발 기술을 소개한다. EMS는 원방제어감시에 사용되는 SCADA(Supervisory Control And Data Acquisition) 데이터를 포함하여 자동발전, 경제급전 등의 전력 계통을 위해 가공된 데이터를 메모리 데이터베이스에 저장한다. 본 연구에서는 EMS의 메모리 데이터베이스에 저장되어 있는 데이터를 시스템 운영자가 선별을 하여 동기화를 수행할 수 있도록 한다. 또한 동기화 되고 있는 현황을 가시적으로 보임으로써 Enable 서버의 장애 발생 시 Standby 서버로의 대체가 유연하고 안정적이며, 신뢰성을 줄 수 있다.

An improved method to determine hydroxyproline in an immortalized rat liver stellate cell line (HSC-T6)

  • Lee, Eun-Su;Kwak, Wie-Jong;Lee, Eung-Seok;Soh, Yun-Jo
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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    • pp.154.1-154.1
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    • 2003
  • Hydroxyproline (HYP) is a post-translational product of proline hydroxylation catalyzed by an enzyme prolyl 4-hydroxylase which plays a crucial role in the synthesis of all collagens, because the 4-hydroxyproline residues are essential for the folding of the newly synthesized collagen polypeptide chains into triple-heical molecules. Considering the role of collagen and its significance in many clinically important diseases such as liver cirrhosis, a great deal of attention has been directed toward the development of an assay at cell-based system. (omitted)

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MPEG Immersive Video 를 위한 그룹 기반 적응적 스트리밍 (Towards Group-based Adaptive Streaming for MPEG Immersive Video)

  • 정종범;이순빈;최재열;이광순;곽상운;정원식;이봉호;류은석
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송∙미디어공학회 2022년도 추계학술대회
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    • pp.54-57
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    • 2022
  • 다수의 색상 및 거리 정보로 구성된 몰입형 영상 부호화를 위한 MPEG immersive video (MIV) 표준은 각 시점의 영상 간 중복성 제거 및 잔여 영상 병합을 통한 압축률 향상을 목표로 한다. 시점에 따른 카메라 그룹핑을 통해 압축률 향상이 가능하나, 그룹 기반 MIV 부호화 기술은 최근 활발히 논의되고 있지 않다. 따라서 본 논문은 최신 버전의 MIV 참조 소프트웨어에 그룹 기반 부호화 기술을 이식하고 적응적 스트리밍을 위한 그룹 기반 부호화 기술의 효율을 검증하였다.

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