• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2016.11a
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• pp.154-154
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• 2016

다공성 수지상 구리분말은 그 구조적 특성으로 인해 다양한 촉매 분야에 사용되어왔으며, 본 연구에서는 전해도 금욕의 종류에 따라 수지상 구리의 표면적 특성에 대해 연구하였다. 도금욕의 종류($CuSO_4$, $CuCl_2$, $Cu_2P_2O_7$), 인가 전위, 도금시간(1, 5, 10, 30min)에 따른 수지상 형상을 비교하였다. SEM 이미지 분석 결과 황산구리와 염화구리 도금용액에서는 plate-like dendrite 형상이 관찰되었으며, 피로인산구리 도금용액에서는 needle-like dendrite 형상이 관찰되었다. 정전위 실험결과 도금용액별 한계전류밀도에서 음(-)의 방향으로 100mV 낮은 지점의 인가 전위 및 도금시간 10분에서 3가지 용액 모두 가장 미세한 수지상 입자가 관찰되었다. 도금용액별 겉보기 밀도 및 BET 비표면적을 측정해본 결과 미세한 수지상일수록 겉보기밀도는 낮게 비표면적은 크게 측정되었다. 가장 낮은 겉보기 밀도와 가장 높은 BET 비표면적을 가지는 용액은 염화구리 도금용액이었으며 그 값은 $0.951g/cm^3$, $1.8052m^2/g$이었다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.2
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• pp.145-152
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• 2023

In this study, microscopic observation was made on the surface of cement paste immersed in an aquatic environment for 100 days at electrochemical treatment to mitigate the leaching of alkali ions. To quantitatively rank the hydration products, unhydrated grains and porosity in the interfacial region, the backscattered electron(BSE) images were obtained by scanninng electron microscopy. As a result, it was found that the porosity on the surface was significantly reduced by the electrochemical treatment, while unhydrated grains were more or less increased presumably limited hydration reaction under electric charge. At electrochemical treatment, Ca²⁺ ions present in C-S-H gel could be precipitated with OH^- to form Ca(OH)₂ then to lower C-S-H gel and simultaneously to enhance Ca(OH)₂. Substantially, the risk of alkali leaching could be lowered by the limited ionized matrix under electrochemical treatment.

• The Journal of the Convergence on Culture Technology
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• v.10 no.2
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• pp.505-510
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• 2024

Since rolling contact fatigue cracks can always occur on the rail surface, which is the contact surface between wheels and rails, railway rails require thorough inspection and diagnosis to thoroughly inspect the condition of the cracks and prevent breakage. Recent detailed guidelines on the performance evaluation of track facilities present the requirements for methods and procedures for track performance evaluation. However, diagnosing and grading rail surface damage mainly relies on external inspection (visual inspection), which inevitably relies on qualitative evaluation based on the subjective judgment of the inspector. Therefore, in this study, we conducted a deep learning model study for rail surface defect detection using Fast R-CNN. After building a dataset of rail surface defect images, the model was tested. The performance evaluation results of the deep learning model showed that mAP was 94.9%. Because Fast R-CNN has a high crack detection effect, it is believed that using this model can efficiently identify rail surface defects.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.05a
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• pp.61-62
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• 2006

본 연구에서는 대표적인 양친매성분자인 Arachidic acid를 이용하여 박막을 제작하였으며, 층수 변화에 따른 표면이미지와 전압-전류 특성을 측정하였다. Arachidic acid 는 포화지방산으로 ($CH_3(CH_2)_{18}$ COOH)의 구조를 가지며, 크기가 $27.5{\AA}$으로 $CH_3(CH_2)_{18}$의 소수기와 COOH의 친수기로 구성되어 있어, Langmuir-Blodgett (LB) Trough을 사용하여 박막제작과 분자제어가 쉽다. Chloroform을 용매로 하여 2 mmol/l의 농도를 조성하여 ${\pi}$-A 등온선을 통해 기체 상태, 액체 상태, 고체 상태를 관찰하였다. LB 막의 제작 및 평가에서 막의 안정성은 ${\pi}$-A 곡선, AFM(Atomic force microscopy) 등을 통하여 확인하였다. 또한 LB 막을 Metal/유기물 LB막/Metal 구조의 소자로 제작하여 전압-전류 특성을 측정하였다.

• Journal of Conservation Science
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• v.35 no.3
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• pp.237-244
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• 2019

In this study, we applied terahertz imaging technology to three Korean modern oil paintings ('Boy,' 'Girl,' and 'Hyehwadong Landscape'); investigated the types of inner layer information in the pictures that can be extracted with terahertz imaging technology; and analyzed the conditions for extracting them. The biggest problem in the terahertz imaging analysis we encountered was the image distortion caused by the change of the distance between the target surface and the terahertz detector, depending on the surface curvature of the target paintings. We then developed a 'working distance maintaining device' to solve this problem. As a result, the terahertz imaging technique was used to identify the base material characteristics and any patterns of damage inside, and presented the optimal conditions for identifying each characteristic. In addition, it was useful to employ the terahertz frequency-division image to check the characteristics of the background materials. To confirm coloring techniques such as brush strokes, it is effective to compare the maximum reflection peak image with the cross-section image; and to detect damage information inside the paintings that cannot be observed on the surface, to compare the cross-section image with the frequency-division image. On the other hand, according to the terahertz imaging analysis of the oil paintings, the internal structural damage marks of 'Boy' and 'Girl' were confirmed, and the artist's painting style was confirmed in 'Hyehwadong Landscape.' The above results are expected to be useful for the analysis and diagnosis of Korean modern oil paintings for their preservation.

• Archives of design research
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• v.16 no.3
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• pp.291-298
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• 2003

In the rapidly advancing modern world, Fashion Illustrations are being utilized in various aspects of art and industrial works. Fashion illustrations are especially useful in fields like trend books thats show advanced trends where photographs are difficult to be utilized due to the fact the real object does not exist. Both the academic and industrial worlds have realized the importance of Fashion illustration and have started to study the field as a way of expressing the general image of a costume rather than a diagram for making clothes. The focus of this study is on Fashion illustrations using Photo Montages that express modern fashion using various and unique textures. The study is composed of a literature review on Fashion illustration and Photo Montages. and five work pieces are made focusing on expressing compounded images.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.9
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• pp.5434-5439
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• 2014

The surface management of metals was performed with a tool microscope or surface roughness measurement instruments. These methods were not efficient for checking the surface status of the die in the production field. For this reason, an analysis system or measurement system to monitor the wear, defects and surface status as a die ages is required. This study, developed surface analysis software for automatic analysis and standardization of a die or processed products. Software was designed to measure the basic features, such as circles, dots, and lines. The captured images were rendered as three-dimensional representations so that the depth of the grooves on the die and segmental profiles could be estimated. As a result of experimental analysis, the surface roughness was measured with an accuracy more than 93.2%, and the maximum deviation in the surface roughness for the brightness of the lighting was within $3{\mu}m$. The confidence in the device's precision was assured. These results show quality control through efficient surface analysis.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.874-877
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• 2011

본 연구의 목적은 기업의 활동 중 감각적 이미지 전략 구축 중 디자인 요소의 선택과 같은 프로세스를 체계화하며, 제품 제작 담당자에게 전달자와 수용자의 감각 이미지 연구를 통하여 감각의 효율적 활용에 대한 연구를 하고자 하였다. 연구방법은 여러 감각이 혼합되어 있는 공감각이라는 인간의 감각이 브랜드 관련 기업, 제품, 서비스, 기관 등에 어떠한 형태로 적용되어 표현되는지 현황조사를 통하여 분석하였다. 이론적 이해와 고찰 및 사례분석 등은 유사한 논제의 국내 외 문헌조사와 2009년 후반기까지 시판 중인 제품의 인터넷 자료를 병행 하였다. 연구 결과에 의하면 첫째, 시각적인 공감각은 제품의 연상되는 형태, 로고디자인의 형태, 재료의 색상을 통하여 식감을 자극하고 있었다. 둘째, 청각적 공감각은 의성어나 소리를 연상시키는 심볼마크를 통하여 표현하고 있었다. 셋째, 후각적 공감각은 향기 나는 소리나 향기 나는 원재료, 향기 나는 매장 등을 통하여 후각을 사용하고 있었다. 넷째, 미각적 공감각은 제품의 신속함이나 달콤함 또는 연상되는 맛을 통하여 독특한 미각을 메타포로 사용하는 경우가 많았다. 마지막 다섯째, 촉각적 공감각은 패키지 모양이나 형태, 제품명에서 느껴지는 온도, 제품 표면질감을 다른 소재로 표현하는 방식으로 촉각을 자극하고 있었다. 이러한 공감각을 이용한 브랜드와 디자인은 소비자로 하여금 오감을 자극하여 감성시대에 능동적 감성디자인 소비자로 변화시키고 있다.

• Journal of the Korean Society for Nondestructive Testing
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• v.32 no.4
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• pp.418-430
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• 2012

The present paper reviews the micro and nano nondestructive evaluation(NDE) technique that is possible to investigate the surface and measure the acoustic properties. The technical theory, features and applications of the ultrasonic atomic force microscopy(UAFM) and scanning acoustic microscopy(SAM) are illustrated. Especially, these technologies are possible to evaluate the mechanical properties in micro/nano structure and surface through the measurement of acoustic properties in addition to the observation of surface and subsurface. Consequently, it is thought that technique developments and applications of these micro/nano NDE in advanced industrial parts together with present nondestructive industry are widely possible hereafter.

• Journal of Korea Water Resources Association
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• v.43 no.2
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• pp.153-165
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• 2010

Large-Scale Particle Image Velocimetry (LSPIV) is an extension of particle image velocimetry (PIV) for measurement of flows spanning large areas in laboratory or field conditions. LSPIV is composed of six elements - seeding, illumination, recording, image transformation, image processing, postprocessing - based on PIV. Possible error elements at each step of Mobile LSPIV (MLSPIV), which is a mobile version of LSPIV, in field applications are identified and summarized the effect of the errors which were quantified in the previous studies. The total number of elemental errors is 27, and five error sources were evaluated previously, seven elemental errors are not effective to the current MLSPIV system. Among 15 elemental errors, four errors - sampling time, image resolution, tracer, and wind - are investigated through an experiment at a laboratory to figure out how those errors affect to velocity calculation. The analysis to figure out the effect of the number of images used for image processing on the velocity calculation error shows that if over 50 images or more are used, the error due to it goes below 1 %. The effect of the image resolution on velocity calculation was investigated through various image resolution using digital camera. Low resolution image set made 3 % of velocity calculation error comparing with high resolution image set as a reference. For the effect of tracers and wind, the wind effect on tracer is decreasing remarkably with increasing the flume bulk velocity. To minimize the velocity evaluation error due to wind, tracers with high specific gravity is favorable.