• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1627-1629
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• 1997

엑시머 레미저를 이용한 다결정 실리콘막과 게이트 절연막 사이의 계면 거칠기를 개선하기 위해 변형핀 방법의 레이저 어닐링으로 다결정 실리콘 박막 트랜지스터를 제작하였다. SEM(scanning electron microscope)으로 활성층과 게이트 절연층과의 표면 이미지를 관찰한 결과 기존의 레이저 어닐링 결정화에 의한 것보다 계면 거칠기 정도가 상당히 줄었음을 관찰 하였다. 이렇게 개선된 계면 거칠기가 다결정 박막 트랜 지스터의 성능에 미치는 효과를 분석하기 위해 기존의 방법으로 제작된 소자와 계면 거칠기를 줄인 소자의 여러 가지 전기적 변수들(문턱 전압 기울기, 문턱 전압, 누설 전류)을 비교해 보았다. 우리는 또한 계면 거칠기와 다결정 박막 트랜지스터 소자의 상관 관계를 보기 위해 컴퓨터 시뮬레이션도 함께 병행하였다. 시뮬레이션을 통해 거친 계면 부근의 전계 집중 효과 같은 것으로 인해 소자의 성능이 저하된다는 것을 알 수 있었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.11a
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• pp.320-323
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• 2000

We attempted to fabricate polyurethane derivatives (PU-CN, PU-DCM) LB films by using LB method. Also, we investigated the monolayer behavior at the air-water interface by surface pressure-area ($\pi$-A) isotherms. And, the surface morphologies and the physicochemical properties of LB films were investigated by atomic force microscopy (AFM) and UV-vis spectroscopy, respectively. Also, the electrical properties of polyurethane derivatives LB films were investigated by using the conductivity and the dielectric constant. In the AFM images, we conclude that surface morphology of PU-DCM LB films is smooth and homogeneous and has optimal hydrophobicity and good stability, whereas PU-CN LB films give rougher surfaces with more excess material. In the I-V characteristics, the conductivity is different as to the polyurethane derivatives, it is considered that this phenomena could be described by the difference of lumophore pendant which was adhered at PU main chain.

• Journal of the Korea Computer Graphics Society
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• v.27 no.5
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• pp.25-32
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• 2021

Direct Volume Rendering(DVR) renders by projecting data into a two-dimensional space without calculating the volume surfaces. In DVR, the transfer function(TF) assigns light properties such as color and transparency to the volume. However, it takes a long time for beginners to manipulate TF to understand volume data and assign colors. This paper proposes an approach to colorize the volume using sample images for intuitive volume rendering. We also discuss color extraction methods using K-means clustering.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.669-670
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• 2023

본 논문에서는 열화상 카메라 및 주변 환경요인 측정 시스템을 이용하여 각종 반도체 제조공정에 사용되는 화학물질의 누수를 검출하는 방안을 제안한다. 이는 대형화되고 복잡한 집적배관이 시공되어 있는 공장 환경에서 검출센서를 통한 화학물질 누수 관리를 열화상 시스템으로 대체함으로써 보다 정확하고 안정적인 모니터링을 통해 신속한 대응 및 관리가 가능할 것이다. 또한 본 연구를 통해 누수 배관표면의 열패턴을 실시간으로 모니터링 함으로 기존 누수 검출 센서(면적식 라인타입의 센서)에 대비하여 20% 이상 검출의 신속성 향상을 보장할 수 있다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.173-173
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• 2011

반도체 집적도의 비약적인 발전으로 복잡하고 다양한 공정이 연구되었고 공정 중 박막에서 발생되는 물리적, 화학적 반응들에 대한 연구 필요성이 대두 되었다. 박막은 다양한 공정 환경에서 박막의 특성을 잃지 않고 물성을 유지하여야 한다. 특히 공정상의 고온 환경에서 박막은 안정해야하며 물리적손상이 있어서는 안 된다. 이 논문에서는 반도체의 기판으로 사용되는 Si기판과 금속배선 물질인 Cu와의 확산을 효과적으로 방지하기 위한 W-C-N 확산방지막을 제시하였고 시료 증착을 위하여 rf magnetron sputter를 사용하여 동일한 증착조건에서 질소(N)의 비율을 다르게 하여 박막 내 질소비율(0 sccm, 2 sccm)에 따른 확산방지막을 제작하였다. 이후 시료의 열적 안정성 측정을 위하여 상온, 600도, 800도로 각각 질소 분위기에서 30분간 열처리 과정을 실시하여 열적 손상을 인가하였다. 이후 Nanoindentation기법을 이용하여 총 16 point 측정을 하였다. 이를 Weibull distribution으로 분석하여 정량화 시켜 박막의 균일도와 신뢰도를 연구하였다. 또 WET-SPM을 이용하여 AFM 표면 이미지를 확인하였다. 그 결과 고온에서 박막이 Compressive stress를 받아 박막이 일어남을 확인 하였다. 이는 질화물질이 고온에서 물성변화가 적게 나타나는 것을 알 수 있었고, 균일도와 결정성 또한 질화물질에서 더 안정적이었다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.4
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• pp.201-205
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• 2020

The structural texture is defined as a form which a texel is regularly repeated in the texture. Structural texture analysis/recognition has various industrial applications, such as automatic inspection of textiles, automatic testing of metal surfaces, and automatic analysis of micro images. In this paper, we propose a Convolution Neural Network (CNN) based system for structural texture analysis. The proposed method learns texles, which are components of textures to be classified. Then, this trained CNN recognizes a structural texture using a partial image obtained from input texture. The experiment shows the superiority of the proposed system.

• Journal of the Korean Society for Nondestructive Testing
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• v.25 no.2
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• pp.95-102
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• 2005

There are many tube and pipeline in nuclear power plant under high temperature and high pressure. Erosion and corrosion defects were expected on these tube and pipe-line by environmental and mechanical factors. These erosion and corrosion defects ran be evaluated by ultrasonic technique. In these study, Scanning Laser Source(SLS) technique was applied to detect defect and construct image. This technique also makes detection possible on rough and curved surfaces such as tube and pipe-line by scanning. Conventional ultrasonic scanning technique requires immersion of specimen or water jet for transferring ultrasonic wave between transducer and specimen. However, this SLS technique does not need contacting and couplant to generate surface wave and to get flaw images. Therefore, this SLS technique has several advantages, for complicated production inspection, non-contact, remote from specimen, and high resolution. In this study, SLS images were obtained with various conditions of generation laser ultrasound and receiving in order to enhance detectability of flaws on the tube. Stress corrosion cracks were produced on tube and images of stress corrosion cracks were constructed by using SLS technique.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.5
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• pp.67-76
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• 2013

In this study, the inhibitive effect of electrochemical treatment subjected to fresh and hardened concrete and literature reviews in terms of the treatment were performed. In hardened concrete, chloride ions are mixed during casting to destroy the passivity of steel, and then the current was provided for 2 weeks with 250, 500 and $750mA/m^2$. After completion of electrochemical treatment, the extraction of chloride ions was quantified and repassivation of steel was observed. Simultaneously, the equated levels of current density for 2 weeks were applied to fresh concrete. Steel-concrete interface in concrete was observed by BSE image analysis and the concrete properties in terms of the diffusivity of chloride ions and the resistance of steel corrosion was measured. As the result, electrochemical treatment is very effectiveness to rehabilitate the passive film on the steel surface and 63-73% of chloride ions in concrete were extracted by the treatment. As the treatment was applied to fresh concrete, the resistance of steel corrosion was improved due to the densification of $Ca(OH)_2$ layers in the vicinity of steel. However, an increase in the current density resulted in an increase in surface chloride content of concrete.

• Journal of Digital Convergence
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• v.12 no.1
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• pp.519-524
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• 2014

This research is the study of raindrop rendering. In case of rendering for raindrop in existing games, it is used on sprites images or roughly raindrops images using texture rendering. These methods are similar to the shape and size of all rendered raindrop. That's why players are limitations to provide a sense of reality. To overcome this limitation, this paper proposes a method for generating raindrop considering surface tension and contac angle, the amount of water, implements the raindrop using Unity3D engine. To demonstrate the usefulness of this paper, this paper shows the generated raindrop in accordance with the change in the area and pulling force in surface tension formula. This paper can help to provide the actuality in game in case of rendering the raindrop.

• Journal of the Korean Applied Science and Technology
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• v.32 no.3
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• pp.522-527
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• 2015

We applied a displacement current measurement technique for the study of L-${\alpha}$-dilauryl phosphatidylcholine (DLPC) monolayer. Displacement current was generated at the DLPC monolayer on the water surface, while induced by compression and expansion of the monolayer. Generation of Maxwell displacement current (MDC) was observed when surface areas per DLPC molecule were approximately $200{\AA}^2$ and $40{\AA}^2$. We investigated MDC for monolayer compression cycles, and found that MDC reached the maximum at the molecular area, which was measured right before surface pressure began to increase during compression cycles. The monolayer surface morphology of Langmuir-Blodgett (LB) films was characterized using atomic force microscope (AFM). As a result, we measured the result from the microscopic properties shown in the AFM images of LB films that molecules in the monolayer were in good orientations and the thickness of the monolayer ranged from 5 to 10 nm.