• 한국전기전자재료학회논문지
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• 제24권9호
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• pp.739-743
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• 2011

Ga doped ZnO (GZO)/Cu bi-layer films were deposited with RF and DC magnetron sputtering on glass substrate and then the effect of post deposition annealing temperature on the structural, optical and electrical properties of the films was investigated. The post deposition annealing process was conducted for 30 minutes in gas pressure of $1{\times}10^{-3}$ Torr and the annealing temperatures were 150 and $300^{\circ}C$. With increasing annealing temperature, GZO/Cu films showed an increment in the prefer orientation of ZnO (002) diffraction peak in the XRD pattern and the optical transmittance in a visible wave region was also increased, while the electrical sheet resistance was decreased. The GZO/Cu films annealed at $300^{\circ}C$ showed the highest optical transmittance of 70% and also showed the lowest electrical resistance of $85\;{\Omega}/{\Box}$ in this study.

• 소성∙가공
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• 제13권6호
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• pp.497-502
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• 2004

The shape of cold rolled steel sheets is defined as the degree of flatness, and the flatter, the better. Because undesirable strip shapes of cold rolled steel sheets can affect not only visible problem but also automatic working process in customer's lines, the requirement of the customers is more and more stringent. So we usually used the tension leveler to make high quality of strip flatness. For the improvement of the quality of strip flatness, this report developed three- dimensional FEM (Finite Element Method) simulation model, and analysis about the strain and stress distribution of strip in the tension leveling process. The numerical study can be summarized as follows. (1) If we pass the edge wave material (steepness: $1.0\%$) that the stress-difference between the strip center and the edge is 5.2kgf through tension leveler. the stress-difference is decreased 0.45kgf and the steepness is improved to $0.29\%$. (2) If the Intermesh is increased from 6mm to 7mm, the steepness is improved from $0.294\%$ to $0.268\%$. (3) If the initial steepness is decreased form $1.0\%$ to $0.75\%$, the final steepness is improved from $0.294\%$ to $0.263\%$. We know that more increased intermesh and lower initial steepness make the final steepness improved.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계학술대회논문집
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• pp.205-208
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• 2005

Fabrication of large scaled mirror for the telescope application is the most challenging technology in recent year. Sophisticate technologies and know-how in fabrication and measurement are required to overcome the technological obstacles. KRISS(Korea Research Institute for Standards and Science) is now developing a large scaled mirror fabrication facility and KARI(Korea Aerospace Research Institute) is supporting the development. High precision interferometric test is required during the grinding and polishing of mirror to identify the surface profile precisely. The required fabrication accuracy of the mirror surface profile is $\lambda$/50 ms($\sim$10 nm for visible wave length). Thus the measurement accuracy should be far less than 10 m. To get this requirement, it is necessary to provide vibration free environment for the interferometer system and mirror under test. Thus the vibration responses on the mirror supporting table due to external vibration should be minimized by using a special isolation system. And the responses on the top of the tower, which hold the interferometer during test, should be minimized simultaneously. In this paper, we propose the concept design of vibration suppression system for the KRISS mirror fabrication facility.

• 한국표면공학회지
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• 제47권6호
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• pp.341-346
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• 2014

Ga-doped ZnO (GZO) single layer and $SiO_2/GZO$ bi-layered films were deposited on Polycarbonate(PC) substrate by radio frequency magnetron sputtering. Influence of the structural, electrical, and optical properties of the films was considered. We have considered the influence of electron irradiation energy of 450 and 900 eV on the stuctural, electrical and optical properties of $SiO_2/GZO$ thin films. The optical transmittance in a visible wave length region increased with the electron irradiation energy. The electrical resistivity of the films were dependent on the electron's irradiation energy. The $SiO_2/GZO$ films irradiated at 900 eV were showen the lowest resistivity of $7.8{\times}10^{-3}{\Omega}cm$. The film which was irradiated by electron at 900 eV shows 84.3% optical transmittance and also shows lower than contact angle of $58^{\circ}$ in this study.

• 한국인터넷방송통신학회논문지
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• 제21권6호
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• pp.111-116
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• 2021

초분광 영상은 적외선 영역의 전자기파 대역을 수백 개의 파장으로 나누어 영상화한 데이터로 다양한 분야에서 물체를 찾거나 분류하는 것에 활용된다. 최근에는 딥러닝을 사용하여 분류하는 방법이 주목받고 있지만 초분광 영상 데이터의 특성으로 인해 초분광 영상을 학습 데이터로 사용하기 위해서는 기존의 가시광 영상과는 다른 처리 기법이 필요하다. 이를 위해 초분광 큐브에서 특정 파장의 영상을 선택하여 Ground Truth 작업을 수행하고 환경정보를 포함하여 데이터를 관리하는 소프트웨어를 개발하였다. 본 논문에서는 해당 소프트웨어의 구성과 기능에 대하여 설명한다.

• Elastomers and Composites
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• 제55권4호
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• pp.321-328
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• 2020

Zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and sodium hydroxide (NaOH) were dissolved in distilled water and stirred for 30 min. The resulting solution was sonicated by an ultrasonic wave for 45 min. This solution was washed with distilled water and ethanol after centrifugation; next, it was placed in an electric furnace at 200℃ for 1 h under the flow of Ar gas to obtain zinc oxide nanoparticle. A zinc oxide nanoparticle-(C60) fullerene nanowhisker composite was synthesized using the zinc oxide nanoparticle solution, C60-saturated toluene, and isopropyl alcohol via the liquid-liquid interfacial precipitation method. The zinc oxide nanoparticle and zinc oxide nanoparticle-(C60) fullerene nanowhisker composite were characterized using X-ray diffraction, scanning electron microscopy, and Raman spectroscopy, and they were used for the catalytic degradation of methyl orange (MO) under ultraviolet (at 254 and 365 nm) and ultrasonic irradiation. In addition, the catalytic degradation of MO over the zinc oxide nanoparticle and zinc oxide nanoparticle-(C60) fullerene nanowhisker composite was evaluated using ultraviolet-visible spectroscopy.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 추계학술발표대회
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• pp.637-640
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• 2023

This paper presents multimodal image fusion with human pose for detecting abnormal human behaviors in low illumination conditions. Detecting human behaviors in low illumination conditions is challenging due to its limited visibility of the objects of interest in the scene. Multimodal image fusion simultaneously combines visual information in the visible spectrum and thermal radiation information in the long-wave infrared spectrum. We propose an abnormal event detection scheme based on the multimodal fused image and the human poses using the keypoints to characterize the action of the human body. Our method assumes that human behaviors are well correlated to body keypoints such as shoulders, elbows, wrists, hips. In detail, we extracted the human keypoint coordinates from human targets in multimodal fused videos. The coordinate values are used as inputs to train a multilayer perceptron network to classify human behaviors as normal or abnormal. Our experiment demonstrates a significant result on multimodal imaging dataset. The proposed model can capture the complex distribution pattern for both normal and abnormal behaviors.

• 한국산업정보학회논문지
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• 제22권4호
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• pp.1-9
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• 2017

본 논문에서는 위상 천이 디지털 홀로그래피(PSDH; Phase-Shifting Digital Holography) 및 디지털 워터마킹(Digital Watermarking) 기반 디지털 홀로그램의 이중 암호화 기술을 제안한다. 이를 위해 먼저 디지털 워터마크에 사용할 로고 영상을 정하고, 이 영상에 대한 이진 위상 컴퓨터형성 홀로그램(CGH; Computer Generated Hologram)을 반복 알고리즘을 이용하여 설계한다. 그리고 랜덤하게 발생시킨 이진 위상 마스크를 워터마크로 정하고, 설계된 이진 위상 CGH와 XOR 논리연산을 통해 워터마크 정보에 대한 키 영상을 생성한다. 그리고 물체 영상을 위상 변조하여 세기가 일정한 함수로 만든 후, 워터마크인 랜덤하게 발생시킨 이진 위상 마스크를 곱하여 물체파를 생성한다. 이 물체파는 워터마크 정보가 포함된 잡음과 유사한 패턴을 가지는 1차 암호화된 영상이라고 할 수 있다. 이를 2-단계 PSDH기술을 적용하여 기준파와 간섭을 시키면 가시성이 향상된 최종 간섭무늬를 얻는다. 이 간섭패턴이 최종적으로 구하고자 하는 물체 영상의 2차 암호화된 영상이 된다. 암호화된 영상의 복호화는 2-단계 PSDH기술을 통한 암호화된 영상들을 이용하여 적절한 산술연산 처리한 후, 프레즈넬 변환 및 1차 암호화 과정의 역순으로 진행하면 된다. 제안된 방법의 암호화 및 복호화 기술은 컴퓨터 시뮬레이션을 통하여 검증된다.

• 암석학회지
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• 제22권1호
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• pp.1-8
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• 2013

타지키스탄 산 루비의 보석 광물학적 특징들을 알기 위해 물리적 특성, 원소분석, 내포물 분석, 그리고 분광분석(UV-VIS 분광기, FTIR 분광기, ED-XRF 분광기)을 수행하였다. 타지키스탄 산 루비는 장파에서는 보통에서 매우 강한 적색 또는 오렌지색을 띄었으며, 단파에서는 장파에서보다는 약간 약한 적색 또는 오렌지적색을 띈다. 자외선-가시광선 분광분석 결과, 3개의 흡수선 468.5, 475와 476.5 nm이 크롬이 함유된 루비의 대표적인 특징으로 나타났고, 넓은 흡수 밴드 550 nm와 적색 영역에서 몇 개의 흡수밴드가 나타나서 전체적인 루비 스펙트럼을 보여준다. 적외선 분광분석 결과, 루비 10개 시료들이 모두 매우 유사한 양상을 보이고 있으며, 타지키스탄 산 루비에서 카올리나이트(kaolinite)와 뵈마이트(boehmite)의 존재를 추측할 수 있는데, 그것의 존재는 천연이라는 것을 증명한다. 카올리나이트는 3500, 3617, 3630, $3697cm^{-1}$ 부근에서 특징적인 다수의 흡수 피크를 보이고, 뵈마이트는 1989, $2125cm^{-1}$ 주변에서 뚜렷한 흡수 피크가 관찰되며 3085와 $3320cm^{-1}$ 사이에서 넓은 흡수 밴드가 나타났다. 내포물에서는 침상내포물, 액상과 고상내포물 외에 산화철에 기인한 오렌지 색대가 나타나고 있다. 연구 결과는 타지키스탄 산 루비의 감별 및 산지 추측에 유용한 정보로 활용될 수 있다.

• 한국재료학회지
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• 제13권3호
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• pp.185-190
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• 2003

Titanium dioxide films were prepared by RF sputtering method on glass for various oxygen partial pressures at power 270 W. The crystal structure, photocatalytic property and the hydrophilicity of $TiO_2$thin film the deposition conditions were investigated. Crystallized anatase phase was observed in $TiO_2$film deposited at the ratio of oxygen partial pressure 10% and 20% for 2 hrs. As the increase of deposition time, the grain size and void size of $TiO_2$film have increased and also $V_2$films have been good crystallinity. The ultraviolet-visible light absorption of $TiO_2$films was increased with increasing of deposition time and occured chiefly at the wavelength between 280 and 340 nm. The absorption band was shifted to a longer wave length as deposition time increased. Water contact angle on the X$TiO_2$film of anatase structure was decreased with increasing ultraviolet illumination time and became lower than $11^{\circ}$ from $83^{\circ}$. When hydrophilic $TiO_2$film changed by enough ultraviolet illumination was stored in the dark, the film surface gradually turned to hydrophobic state.