• 제목/요약/키워드: multi-layers

검색결과 998건 처리시간 0.023초

용액 공정 기반의 다중 적층된 HfO2 박막 상에서의 액정 배향 (Liquid Crystal Alignment on Multi-stacked Layer HfO2 Thin Films Using a Solution-process)

  • 김대현
    • 한국전기전자재료학회논문지
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    • 제26권11호
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    • pp.821-825
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    • 2013
  • Effect of multi-stacked layer (MSL), 0.1 mol (M) and 0.3 mol (M) hafnium oxide ($HfO_2$) alignment layers were fabricated via a solution-process for LCs orientation. The solutions were spin-coated and annealed in a furnace. MSL consists of three sub-layers using 0.1 M solution, mono-layer (ML) is composed of 0.3 M $HfO_2$ solution. Then ion-beam irradiation was treated with 1.8 keV for 2 min. $HfO_2$-based LC cells were investigated through photographs, pre-tilt angle using crystal rotation method, X-ray photoelectron spectroscopy (XPS) measurement, and surface roughness using atomic force microscopy(AFM) for their characteristic research. Good LC orientation characteristics were observed on MSL $HfO_2$ surface. The LC alignment mechanism on MSL $HfO_2$ and ML $HfO_2$ surfaces was attributed to van der Waals (VDW) interaction between the LC molecular and substrate surface.

저온 연소합성 후 확산 열처리한 $Ni_{3}Al$ 금속간화합물 코팅층의 미끄럼 마모거동 (Analysis of Wear Properties for $Ni_{3}Al$ Layer coated on Ferrous Materials by Diffusion Treatment after Combustion Synthesis at low Temperature)

  • 이한영
    • Tribology and Lubricants
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    • 제25권1호
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    • pp.7-12
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    • 2009
  • Coating brittle intermetallic compounds on metal can enlarge the range of their use. It is found that intermetallic compound coating layers made by only combustion synthesis in an electric furnace have porous multi-phase structures containing several intermediate phases, even though the coating layers show good wear resistance. In this study, dense $Ni_{3}Al$ single phase layer corresponding to the initial composition of the mixed powder is coated on two different ferrous materials by the diffusing treatment after combustion synthesis. After- ward, sliding wear behaviors of the coating layer are evaluated in comparison with that of the coating layer with porous multi-phase structure made by only combustion synthesis. As a result, the wear properties of the coating layer composed of dense $Ni_{3}Al$ single phase are considerably improved at the range of low sliding speed com- pared with that of the coating layer with porous multi-phase structure, particularly in the running-in wear region. This is attributed to the fact that wear of the coating layer is progressed by shearing as a sequence of adhesion, not by occurring of pitting on the worn surface due to having dense structure without pores.

Characterization of GaN on GaN LED by HVPE method

  • Jung, Se-Gyo;Jeon, Hunsoo;Lee, Gang Seok;Bae, Seon Min;Kim, Kyoung Hwa;Yi, Sam Nyung;Yang, Min;Ahn, Hyung Soo;Yu, Young Moon;Kim, Suck-Whan;Cheon, Seong Hak;Ha, Hong Ju;Sawaki, Nobuhiko
    • Journal of Ceramic Processing Research
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    • 제13권spc1호
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    • pp.128-131
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    • 2012
  • The selective area growth light emitting diode on GaN substrate was grown using mixed-source HVPE method with multi-sliding boat system. The GaN substrate was grown using mixed-source HVPE system. Te-doped AlGaN/AlGaN/Mg-doped AlGaN/Mg-doped GaN multi-layers were grown on the GaN substrate. The appearance of epi-layers and the thickness of the DH was evaluated by SEM measurement. The DH metallization was performed by e-beam evaporator. n-type metal and p-type metal were evaporated Ti/Al and Ni/Au, respectively. At the I-V measurement, the turn-on voltage is 3 V and the differential resistance is 13 Ω. It was found that the SAG-LED grown on GaN substrate using mixed-source HVPE method with multi-sliding boat system could be applied for developing high quality LEDs.

다층지반에서 횡하중을 받는 군말뚝의 거동 (Behavior of Pile Groups in Multi-layers Soil under Lateral Loading)

  • 김용문;안광국
    • 한국지반환경공학회 논문집
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    • 제13권3호
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    • pp.85-90
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    • 2012
  • 본 논문은 ABAQUS 유한 요소 프로그램을 사용하여 다층지반(화강풍화토-점토-화강풍화토)에서의 외말뚝과 군말뚝의 횡하중에 대한 영향을 설명한다. 본 연구에서의 변수는 캡이 없는 외말뚝과 캡이 있는 군말뚝으로, 파일의 직경은 0.5m, 길이는 10m인 말뚝을 사용하였다. 수치 해석은 말뚝의 간격을 (s=3D, 4D, 5D) 변화시켜 외말뚝과 군말뚝의 거동을 비교하기 위하여 수행되었다. $1{\times}3$군말뚝(leading pile, middle pile, trail pile)은 각각의 말뚝의 저항분포와 수평저항력을 조사하기 위하여 선정되었다. 점토의 해석모델은 Druker-Prager 구성관계를 이용하였고, 화강풍화토의 물성치는 기존의 논문을 사용하였으며, 말뚝은 탄성 원형 콘크리트로 모델링하였다. 해석 결과, 말뚝의 간격이 넓어짐에 따라 P-multiplier의 값이 leading pile의 영향을 덜 받는 것으로 나타났다. 또한, 단층지반이 다층지반에 비해 수평저항력이 약 4~20% 크게 작용하는 것으로 나타났다.

박막태양전지의 광포획 기술 현황 (Current Status in Light Trapping Technique for Thin Film Silicon Solar Cells)

  • 박형식;신명훈;안시현;김선보;봉성재;;;이준신
    • Current Photovoltaic Research
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    • 제2권3호
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    • pp.95-102
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    • 2014
  • Light trapping techniques can change the propagation direction of incident light and keep the light longer in the absorption layers of solar cells to enhance the power conversion efficiency. In thin film silicon (Si) solar cells, the thickness of absorption layer is generally not enough to absorb entire available photons because of short carrier life time, and light induced degradation effect, which can be compensated by the light trapping techniques. These techniques have been adopted as textured transparent conduction oxide (TCO) layers randomly or periodically textured, intermediate reflection layers of tandem and triple junction, and glass substrates etched by various patterning methods. We reviewed the light trapping techniques for thin film Si solar cells and mainly focused on the commercially available techniques applicable to textured TCO on patterned glass substrates. We described the characterization methods representing the light trapping effects, texturing of TCO and showed the results of multi-scale textured TCO on etched glass substrates. These methods can be used tandem and triple thin film Si solar cells to enhance photo-current and power conversion efficiency of long term stability.

다지점 가진에 의한 단일형 현장타설말뚝 교량의 지진거동 (Seismic Behavior of a Bridge with Pile Bent Structures Subjected to Multi-Support Excitation)

  • 선창호;안성민;김익현
    • 한국전산구조공학회논문집
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    • 제32권6호
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    • pp.425-434
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    • 2019
  • 연약지반이 두껍고 다양한 지층으로 구성된 지역에 건설되는 단일형 현장타설말뚝 교량은 다양한 지층을 통해서 단일형 말뚝으로 입력되는 지반운동에 대해서 내진안전성을 확보하는 것이 중요하다. 본 연구에서는 설계지반운동에 부합되는 다수의 인공합성지진을 생성하여 이를 암반의 입력지반으로 하여 지반해석을 수행하여 각 지층에서의 지반가속도이력을 산정하였다. 이 가속도이력을 이용하여 각 지층의 지반을 등가스프링으로 모델화하고, 각 지층에서의 가속도시간이력을 입력지반운동으로 하는 다지점 가진 지진해석을 수행하였다. 연약층의 비선형거동특성으로 입력지반운동의 세기는 크게 증폭되지 않아서 교량은 탄성영역 내에서 거동하였다. 한편, 특정 지층에서 산정된 가속도이력을 모든 지반스프링에 동시에 입력하면 응답이 감소하였다. 따라서, 다지점가진 해석을 수행하지 않으면 이러한 형식의 교량의 내진성능을 과대평가할 수 있다.

델타 도핑한 P형 SiC막의 평가 (Characterization of Delta-Doped P-Type SiC Films)

  • 김태성;정우성;남해곤
    • 태양에너지
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    • 제10권3호
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    • pp.46-52
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    • 1990
  • P층의 정공농도를 높이기 위하여 ${\delta}$-doped P층을 갖는 새로 구상된 a-Si 태양전지를 제작하였다. ${\delta}$-doped P층은 0.1-0.5 원자층의 박막 B층과 undoped a-Si의 여러층으로 구성되어 있다. B층은 광 CVD법과 열분해기법으로 증착시켰다. ${\delta}$-doped P층 박막에 대한 구조적, 광학적 및 전기적 특성을 FTIR, AES, SIMS등을 이용하여 평가하였다. 이 연구의 결과로서는 ${\delta}$-doped P층을 갖는 태양전지에 대하여 12.5%의 에너지변환효율을 달성하였다.

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Nd:YAG Laser를 이용한 자성금속막의 패턴 식각에 있어서 에너지 흡수층이 미치는 영향 (The Effect of Energy-absorbing layers on Micro-patterning of Magnetic Metal Films using Nd:YAG Laser)

  • 이주현;채상훈;서영준;송재성;민복기;안승준
    • 한국전기전자재료학회논문지
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    • 제13권6호
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    • pp.538-544
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    • 2000
  • The laser patterning of sputter-deposited CoNdZr/Cu/CoNbZr multi-layered films had been tried using Nd:YAG laser. However generally it is very difficult to remove metal films because of their high reflectance of the laser on the surfaces. As a counterproposal for this problem authors for the first time tried to deposit energy-absorbing layers on the metal films and then irradiated the laser on the surfaces of energy-absorbing layers. Here the energy-absorbing layers consisted of laser energy-absorbing fine powders and binding polymers. Three kinds of powders for the energy-absorbing layers had been used to see the difference in the pattern formation with the degree of laser energy absorption. They were electrically conductive silver powders insulating BaTiO$_3$powder and semiconducting carbon powder. Remarkable difference in width of the formed pattern and the roughness of pattern edge were observed with the characteristic of the powder for the energy-absorbing layer. The pattern width using carbon paste was about three times larger than that using BaTiO$_3$paste. It was observed that the energy-absorbing layer with carbon was the most effective on this micro-patterning.

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CNN을 사용한 차선검출 시스템 (Lane Detection System using CNN)

  • 김지훈;이대식;이민호
    • 대한임베디드공학회논문지
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    • 제11권3호
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    • pp.163-171
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    • 2016
  • Lane detection is a widely researched topic. Although simple road detection is easily achieved by previous methods, lane detection becomes very difficult in several complex cases involving noisy edges. To address this, we use a Convolution neural network (CNN) for image enhancement. CNN is a deep learning method that has been very successfully applied in object detection and recognition. In this paper, we introduce a robust lane detection method based on a CNN combined with random sample consensus (RANSAC) algorithm. Initially, we calculate edges in an image using a hat shaped kernel, then we detect lanes using the CNN combined with the RANSAC. In the training process of the CNN, input data consists of edge images and target data is images that have real white color lanes on an otherwise black background. The CNN structure consists of 8 layers with 3 convolutional layers, 2 subsampling layers and multi-layer perceptron (MLP) of 3 fully-connected layers. Convolutional and subsampling layers are hierarchically arranged to form a deep structure. Our proposed lane detection algorithm successfully eliminates noise lines and was found to perform better than other formal line detection algorithms such as RANSAC

차폐층을 갖는 다층고온초전도 전력케이블의 전류분류 분석 (Analysis on Current Distribution in Multi-layer HTSC Power Cable with Shield Layer)

  • 이종화;임성훈;임성우;두호익;한병성
    • 한국전기전자재료학회논문지
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    • 제19권3호
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    • pp.273-279
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    • 2006
  • High-$T_c$ superconducting (HTSC) power cable is one of the interesting parts in power application using HTSC wire. However, its stacked structure makes the current distribution between conducting layers non-uniform due to difference between self inductances of conducting layers and mutual inductances between two conducting layers, which results in lower current transmission capacity of HTSC power cable. In this paper, the transport current distribution between conducting layers was investigated through the numerical analysis for the equivalent circuit of HTSC power cable with a shield layer, and compared with the case of without a shield layer. The transport current distribution due to the increase of the contact resistance in each layer was improved. However, its magnetization loss increased as the contact resistance increased. It was confirmed from the analysis that the shield layer was contributed to the improvement of the current distribution between conducting layers if the winding direction and the pitch length were properly chosen.