• 제목/요약/키워드: Gap fill

검색결과 390건 처리시간 0.033초

Full-HD LCOS Panel의 Cell Gap의 변화에 따른 전기광학적 특성에 대한 연구 (A Study of Electro-optical Characteristics of Full-HD LCOS Panel Depending on Various Cell Gaps)

  • 손홍배;김민석;강정원
    • 대한전자공학회논문지SD
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    • 제46권8호
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    • pp.6-11
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    • 2009
  • VA Mode LC를 사용하는 Full-HD급 LCOS 마이크로디스플레이에서 셀 상하 간격의 변화에 따른 전기광학적 특성의 변화에 관하여 3차원 LC code를 이용하여 연구하였다. 5가지의 다른 셀 상하 간격 (1.4 ${\mu}m$, 1.8 ${\mu}m$, 2.1 ${\mu}m$, 2.4 ${\mu}m$ 그리고 2.8 ${\mu}m$)의 변화에 따라 Reflectance-Voltage 특성, 반사광 및 반사율 분포, Optical Fill Factor 그리고 명암비를 비교하였다. Surface Anchoring 효과에 의해 상하 간격이 증가하면서 반사율은 증가하였으나 Optical Fill Factor와 명암비를 고려할 경우, 중간 수준의 간격인 2.1 ${\mu}m$ 의 특성이 가장 우수함을 확인할 수 있었다. 동일한 구조를 갖고 있는 0.7 인치 LCOS 패널을 제작하여 광학적 측정을 해 본 결과 시뮬레이션 결과와 통일함을 확인할 수 있었다.

파이프의 가스메탈아크 용접에 있어 센서 시스템을 이용한 용융지 제어 및 용접선 추적에 관한 연구 (A Study on control of weld pool and torch position in GMA welding of steel pipe by using sensing systems)

  • 배강열;이지형;정수원
    • Journal of Welding and Joining
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    • 제16권5호
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    • pp.119-133
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    • 1998
  • To implement full automation in pipe welding, it si most important to develop special sensors and their related systems which act like human operator when detecting irregular groove conditions. In this study, an automatic pipe Gas Metal Arc Welding (GMAW) system was proposed to full control pipe welding procedure with intelligent sensor systems. A five-axes manipulator was proposed for welding torch to automatically access to exact welding position when pipe size and welding angle were given. Pool status and torch position were measured by using a weld-pool image monitoring and processing technique in root-pass welding for weld seam tracking and weld pool control. To overcome the intensive arc light, pool image was captured at the instance of short circuit of welding power loop. Captured image was processed to determine weld pool shape. For weld seam tracking, the relative distance of a torch position from the pool center was calculated in the extracted pool shape to move torch just onto the groove center. To control penetration of root pas, gap was calculated in the extracted pool image, and then weld conditions were controlled for obtaining appropriate penetration. welding speed was determined with a fuzzy logic, and welding current and voltage were determined from a data base to correspond to the gap. For automatic fill-pass welding, the function of human operator of real time weld seam control can be substituted by a sensor system. In this study, an arc sensor system was proposed based on a fuzzy control logic. Using the proposed automatic system, root-pass welding of pipe which had gap variation was assured to be appropriately controlled in welding conditions and in torch position by showing sound welding result and good seam tracking capability. Fill-pass welding by the proposed system also showed very successful result by tracking along the offset welding line without any control of human operator.

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DSC(Dye-sensitized Solar Cell)의 Grid 간격 변화에 따른 광전특성 연구 (A study on the photoelectric characteristics as a result of changing grid gap)

  • 서현웅;김미정;최진영;홍지태;박성진;김희제
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 춘계학술대회
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    • pp.199-201
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    • 2006
  • A lot of researches and experiments have been performed to make more efficient dye-sensitized solar cell. Among them, insertion of a grid electrode in DSC is one method to increase overall performance as being shortened distance of electrons' movement by diffusion. In this paper, we measured overall characteristics which is included voltage-current characteristic curve, efficiency, fill factor by comparison between DSC without and with grid electrode. As a result, we got maximum 1.8 times increase of efficiency and approximately 1.7 times rise of fill factor. And we experimented 8, 10, 12, 14mm of grid gap and compared their results to optimize grid gap which is able to incite the most effective movement of electrons. Consequently, we got the result that electrons' movement is the most effect ive when grid gap is approximately 12mm.

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비정질 실리콘 태양전지의 Fill Factor에 관한 연구 (A Study on Fill Factor of Amorphous Silicon Solar Cell)

  • 이준호;한민구;이정한
    • 태양에너지
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    • 제7권1호
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    • pp.35-41
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    • 1987
  • This paper presents a comprehensive computer simulation of hydrogenated amorphous p-i-n silicon solar cells. The physical mechanism governing solar cell operation has been modeled and solved numerically by Runge-Kutta-Gill method. Effects of gap state density, dopant impurity, diffusion length and interface recombination velocity on solar cell performance are investigated. Numerical results show that the electric field in i-region is not uniform but depends strongly on voltage and position. A rather poor fill factor may be due to the electric field variation and short diffusion length. It is found out that the life time should be improved in order to increase a fill factor and a conversion efficiency.

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SILICON DIOXIDE FILMS FOR INTERMETAL DIELECTRIC APPLICATIONS DEPOSITED BY AN ECR HIGH DENSITY PLASMA SYSTEM

  • Denison, D.R.;Harshbarger, W.R.
    • 한국진공학회지
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    • 제4권S1호
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    • pp.130-137
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    • 1995
  • Deopsition of thermal quality SiO2 using a high density plasma ECR CVD process has been demonstrated to give void and seam free gap fill of high aspect ratio metallization structures with a simple oxygen-silane chemistry. This is achieved by continuous sputter etching of the film during the deposition process. A two-step process is utilized to deposit a composite layer for higher manufacturing efficiency. The first step, which has a deposition rate of approximately 0.5 $\mu$m/min., is used to provide complete gap fill between the metal lines. The second step, which has a deposition rate of up to 1.5 $\mu$m/min., is used to deposit a total thickness of 2.0$\mu$m for the intermetal dielectric film. The topography of this composite film is very compatible with subsequent chemicl mechanical polishing(CMP) planarization processing.

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Data Retention Time and Electrical Characteristics of Cell Transistor According to STI Materials in 90 nm DRAM

  • Shin, S.H.;Lee, S.H.;Kim, Y.S.;Heo, J.H.;Bae, D.I.;Hong, S.H.;Park, S.H.;Lee, J.W.;Lee, J.G.;Oh, J.H.;Kim, M.S.;Cho, C.H.;Chung, T.Y.;Kim, Ki-Nam
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제3권2호
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    • pp.69-75
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    • 2003
  • Cell transistor and data retention time characteristics were studied in 90 nm design rule 512M-bit DRAM, for the first time. And, the characteristics of cell transistor are investigated for different STI gap-fill materials. HDP oxide with high compressive stress increases the threshold voltage of cell transistor, whereas the P-SOG oxide with small stress decreases the threshold voltage of cell transistor. Stress between silicon and gap-fill oxide material is found to be the major cause of the shift of the cell transistor threshold voltage. If high stress material is used for STI gap fill, channel-doping concentration can be reduced, so that cell junction leakage current is decreased and data retention time is increased.

Digital Broadcasting Industry: Today and Tomorrow

  • 김국진
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 2003년도 디지털방송기술워크샵
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    • pp.67-82
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    • 2003
  • . High potentiality of Digital broadcasting Industry . Low performance of digitalization policy ㆍSollen-Sein Gap makes a bad mood to the digital broadcasting industry . Fill up the gap with aggressive digital policy No stimuli, no move .But need understanding of throughput input isn't all. Digital is common language therefore all information market will be converged as soon as you can imagine

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틈새가 존재하는 이종강 레이저 용접부의 열유동에 관한연구 (A Study on Heat Flow of Laser-Welded Dissimilar Steel Joints with Gap)

  • 양해석
    • 한국군사과학기술학회지
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    • 제10권3호
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    • pp.5-15
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    • 2007
  • A welding structures is generally composed of dissimilar steel materials in order to reduce weight cost, and has a gap to fill the welding agent. Also, heat flow analysis should be fulfilled for structure existing of gap to figure out residual stress which is generated after welding. Since mechanical properties of welding structure composed of dissimilar steel is more fragile than mechanical properties of welding structure consisted of same material, heat flow analysis verifying this should be fulfilled as well. Therefore, on this research, heat flow analysis about dissimilar steel weldment consisted of gap existing AISI304 and AISI630 is practiced so that it could be a basic data of research about mechanical properties of gap existing dissimilar steel welding part which is going to be studied later on. During heat flow analysis, heat input model which based on Gaussian profile and using volume heat flux was newly consisted and applied. In addition, for verifying of analysis on this research, gap existing dissimilar steel weldment which had gap of 0.25mm and was welded using Nd-YAG. The welding profile and temperature distribution for weldment during welding was compared to the result which was gotten through heat flow analysis. Both of those results corresponded each other.