• Transactions of the Korean Society of Mechanical Engineers
• /
• v.13 no.5
• /
• pp.947-951
• /
• 1989

It is well-known that the parameters of dynamic fracture mechanics depend not only on dimensions, loading and boundary conditions but also on the dynamic crack propagation velocity. Because the measurement of dynamic crack propagation velocity measuring device which can easily be expanded without modification is proposed in this report. it was found that the experimentally determined dynamic crack propagation velocity agreed well with those from other investigations in some polymers such as PMMA. Homalite-100 and Epoxy.

• Journal of the Korean institute of surface engineering
• /
• v.34 no.4
• /
• pp.327-336
• /
• 2001

The skinpassing conditions such as roll type, roll force and roll roughness of the work roll were evaluated to give the surface properties of the galvanized steel sheets that were required for automotive and to get rid of the surface defects that caused with the bad control of galvanized coating process parameters. The surface defects of the galvanized steel sheets such as the ripple mark and the scratch were completely removed as the roll force of SPM work roll was increased and the amount of the transfer of roll surface texture to the strip was also gained a lot. The image clarity of electro discharge textured (EDT) coated steel sheets before and after painting was higher than that of the bright (BRT) and shot blasted (SBT) coated steel sheets because of higher PPI value, lower waviness and uniform surface pattern. Since micro-craters transferred on the surface of the galvanized steel sheets played a role of nucleation sites of chromate reaction, Increase of micro-craters was bring to better corrosion resistance with the increase of the roll force and the use of EDT roll at the skin pass mill.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• v.25 no.2
• /
• pp.26-38
• /
• 2021

Image coloration refers to adding plausible colors to a grayscale image or video. Image coloration has been used in many modern fields, including restoring old photographs, as well as reducing the time spent painting cartoons. In this paper, a method is proposed for colorizing grayscale images using a convolutional neural network. We propose an encoder-decoder model, adapting FusionNet to our purpose. A proper loss function is defined instead of the MSE loss function to suit the purpose of coloring. The proposed model was verified using the ImageNet dataset. We quantitatively compared several colorization models with ours, using the peak signal-to-noise ratio (PSNR) metric. In addition, to qualitatively evaluate the results, our model was applied to images in the test dataset and compared to images applied to various other models. Finally, we applied our model to a selection of old black and white photographs.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2020.01a
• /
• pp.21-22
• /
• 2020

본 논문에서는 자동채색 머신러닝 모델을 모바일에서 사용하기 위해 효율적으로 힌트 입력하기 위한 방법을 제시한다. 기존의 자동채색 기법은 서버-클라이언트 채색 방식으로 인터넷에 연결되어 있어야만 채식이 된다는 문제가 있다. 이를 보완하여 네트워크 연결 없이 모바일에서 사용할 수 있는 머신러닝과 이를 사용하기 위해 입력으로 넣어야 하는 힌트 및 이미지를 효율적으로 나눌 수 있는 방법을 고안한다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2023.01a
• /
• pp.399-402
• /
• 2023

본 논문에서는 빛에 영향에 따른 유화의 변화를 보여주기 위해 2D 이미지 재조명과 색채변화를 반영한 회화적 렌더링 방법을 제안한다. 이 방법은 2D 이미지를 재조명하고 해당 음영 값을 가중치로 하여 색채변화를 반영해 렌더링한다. 이때 재조명의 경우 2D 이미지를 3D 이미지로 근사 추정하여 노말값을 결정하고 해당 값과 조명 위치값 사이의 각을 음영 값으로 추출하여 반영한다. 조명 위치는 사용자가 지정 가능하며 빛에 영향에 따른 색채변화 결과는 기존에 연구된 결과를 참조한다. 본 논문에서는 기존의 로컬 이미지에 근사한 자동 회화적 렌더링이 보여주는 단순하고 평면적인 결과에 비해, 재조명을 통해 빛바랜 색과 양감을 반영함으로써 현실에 존재하는 작품처럼 생동적이고 입체적인 렌더링 결과를 제공하여 문화예술작품으로의 표현 및 색채변화 예측-복원에 기여하고자한다.

• Korean Journal of Heritage: History & Science
• /
• v.47 no.3
• /
• pp.128-145
• /
• 2014

After independence, more introductory books on Korean culture were published in both Korea and Japan, along with various papers briefly presenting relevant materials. There are differences depending on the research field, however, a considerable number of articles about Buddhist paintings were published. Research on Korean sculpture was quite active among Japanese scholars. And numerous articles and publications on Korean painting were also presented in both Korea and Japan. Publications on Korean ceramics were increased as much as in other fields. From the late 1980's through late 1990's, research on Korean cultural properties continued to increase, as many young scholars began to conduct research very actively in Korea, producing many articles to introduce new materials. A small number of Japanese scholars also continued to research Korean cultural properties. The overall number of Korean researchers also increased, as existing scholars were joined by students who went to Japan to study and conduct research, thereby helping to significantly expand the area and topics of research. In this period, the exchange exhibitions between Korea and Japan were increased. Also the substantial research reports was began to be published by the national institution. From the early 2000 thrugh present, in all fields, research has progressed and improved since the late 1990's, with many individuals pursuing a microscopic approach to their artifacts and works. More graduate students have been focusing on Korean cultural properties in Japan as the subject of their master's or doctorial thesis in art history, and overall number of researchers in various areas has increased. In the field of Buddhist painting, painting, and Buddhist crafts some important books and articles have been published. However, research achievements have been somewhat uneven. In the area of ceramics, several significant examples of substantial research reports were published by the National Research Institute of Cultural Heritage. These publications are outstanding references that illustrate the future direction of research on Korean cultural properties in Japan.

• 한국연소학회:학술대회논문집
• /
• 2004.11a
• /
• pp.225-230
• /
• 2004

Volatile organic compounds (VOCs) are low calorific value gases (LCVG) emitted from chemical processes such as painting booth, dye works and drying processes etc. Characteristics of VOCs are low calorific values less than 150 kcal/$m^3$, high activation energy for ignition and low energy output. These characteristics usually make combustion unstable and its treatment processes needs high-energy consumption, The cyclone combustion system is suitable for LCVG burning because it can recirculate energy through a high swirling flow to supply the activation energy for ignition, increases energy density to make a combustion temperature higher than usual swirl combustor and also increases mixing intensity, This research was conducted to develop optimized cyclone combustion system for thermal oxidation of VOCs. This research was executed to establish the effect of swirl number with respect to the combustion temperature and composition of exhausted gas in the specific combustor design.

• Journal of architectural history
• /
• v.29 no.3
• /
• pp.7-14
• /
• 2020

It can be meaningful that this study attempted to analyze the use cases and forms based on the literature on the painting walls of the J oseon Dynasty, and attempted basic research to prevent disaster damage using traditional elements. This study summarizes the use of the Hwabangbyeok wall of J oseon Dynasty as follows. First, Hwabangbyeok wall was used from the early J oseon Dynasty and was adopted by palaces and other major state facilities to cope with fire and theft. Second, the Hwabangbyeok Wall was also referred to as the wall below the lower part of the wall, and was constructed with the purpose of preventing disasters from outside. Third, in an analysis of the Daeseongjeon shrine of Hyanggyo, many construction cases were identified mainly in the Gyeonggi area, which is assumed to be based on production and construction conditions along with local climatic factors. Fourth, it can be said that the Hwabangbyeok wall was basically adopted to prevent comprehensive disaster risk reduction in case of external intrusion and fire.

• Journal of Environmental Science International
• /
• v.12 no.7
• /
• pp.825-833
• /
• 2003

The emission of volatile organic compounds (VOCs) generated from painting and coating processes is a worldwide problem as contributing factors to the development of photochemical smog and other environmental problems. Common methods of reducing VOC emissions are adsorption on activated carbon, membrane separation, absorption, incineration, or catalytic oxidation. In this article, the environmental issues caused by VOC emissions and the trend of legislation against such emissions will be surveyed first. Several conventional control technologies will then be summarized and the characteristics of each process will be introduced. Lastly, some examples will be described to show the hybrid processes which have been industrially applied for the recovery of VOC.

• 대한예방의학회:학술대회논문집
• /
• 1999.10a
• /
• pp.49-50
• /
• 1999