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- 저자 : 조영래(Y. R. Cho) (검색결과 14 건)
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조영래(Y. R. Cho),문제도(J. D. Mun),오재열(J. Y. Oh),정효수(H. S. Jeong) 한국진공학회(ASCT) 1995 Applied Science and Convergence Technology Vol.4 No.3
진공측정용 센서의 크기보다 더 작은 미세소자 내부의 진공도를 계산에 의해 간접적으로 구하는 방법을 제시하였다. 평판디스플레이용 진공판넬의 설계에 본 연구의 결과를 적용하는 방법에 대해 연구하였으며, 판넬의 진공도는 판넬과 배기장치의 형상에 강하게 의존하였다. Method of measuring vacuum pressure inside a microcavity was proposed using a simplified model. This could be applied to a flat panel display. The results showed that the pressure in the microcavity of the panel was strongly affected by the shape of a vacuum system.
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교류 섭동 자기장의 제2차 고조파를 이용한 포화자기변형 측정
차상윤(S. Y. Cha),김재관(J. K. Kim),유권상(K. S. Ryu),조영래(Y. R. Cho) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.2
The profiles of the second-order higher harmonics during B-H hysteresis loop have been measured as functions of the tensile stress in grain-oriented 3.2% Si steels. The observed harmonics profiles have been analyzed in terms of the nonlinear, asymmetric magnetization which reflects the domain reorientation under the field. The field interval of the second-order higher harmonics is related to the nucleation and annihilation fields and a measurement method for the magnetostriction is proposed using the harmonics profiles under tensile stress.
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벌크형 비정질 Zr계 합금의 결정화 열처리에 따른 동적변형 거동
장재준,이병주,황진일,박익민,조경목,조영래,Chang J. J,Lee B. J,Hwang J. I,Park I. M,Cho K. M,Cho Y. R 한국재료학회 2004 한국재료학회지 Vol.14 No.3
The mechanical properties of a bulk amorphous alloy ($Zr_{41.2}$ $Ti_{13.8}$ /$Cu_{10}$ $Ni_{10}$ $Be_{22.5}$ /at.%) before and after an annealing treatment were investigated. For the bulk amorphous alloy, the compressive strength was about 2.0 GPa, irrespective of the strain rates in the range of $10^{-4}$ to $10^3$$ sec^{-1}$ . Fine-sized nanocrystalline particles (10~100 nm) were precipitated homogeneously in the bulk amorphous matrix after the annealing treatments. Compared to the bulk amorphous materials, these composite materials, composed of the nanocrystalline phases and a bulk amorphous matrix had much different mechanical properties. The strength and strain of coposite materials measured by a compressive test showed a peak-maximum values at 7 vol.% of the nanocrystalline phases. The values in higher volume fraction of the crystalline phases in the amorphous matrix were decreased, as measured by both quasi-static and high strain rate. The decrease in fracture strength is due to presence of the dispersed large-crystalline phases in the amorphous matrix.
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탄소나노튜브의 분산이 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
안병건,성명석,신허영,김동희,김태식,조영래,Ahn B. G.,Seung M. S.,Shin H. Y.,Kim D. H.,Kim T. S.,Cho Y. R. 한국재료학회 2004 한국재료학회지 Vol.14 No.11
The uniformity of emission mage and field emission properties of carbon nanotube(CNT) cathodes dependence on CNT particle dispersion were investigated for field emission displays. We used multi-walled carbon nanotubes (MWNTs) synthesized by CVD method as the field emitter materials. CNT dispersion in CNT ink was carried out by ultrasonication and shaking methods. According to CNT dispersion conditions, the uniformity of emission image and field emission properties of CNT cathodes were greatly affected. The smaller particles of filler materials and CNT powders provide the better properties of the CNT cathodes.
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이홍찬(H. C. Lee),장지호(J. Chang),조영래(Y.R. Cho),이상태(S.T. Lee),오진석(J.S. Oh),이성근(S.G. Lee),김윤식(Y.S. Kim),K. Ando 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
In this paper, in order to utilize efficient green emission property (Te-cluster emission) in visible light emitting devices (LEDs and LDs), the characteristics of ternary compounds (ZnSSe:Te) have been stuided, focussing on the control of the lattice-matched condition. Efficient and long-lived green LEDs using Te-cluster emission band at room temperature were successfully fabricated. The lifetime characteristics of the ZnSSe:Te-based DH-LEDs shows above 1,500 ills operated at 3 A/㎠.
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