• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.5
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• pp.77-85
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• 2004

This paper proposes a multi-level vector error diffusion method using 64 primary colors to improve color impulse artifact in bright region. Vector error diffusion method causes color impulse artifact in bright region because we only use the Euclidean distance measure in quantization process. In order to reduce this artifact, the proposed method divides input color into chromatic color and achromatic color according to chroma value. In the case of chromatic color, input color is classified into bright region, middle bright region, and dark region according to lightness value. N candidate primary color is organized using lightness difference between input vector and 60 chromatic primary color vector in the case of bright region. Then, primary color with minimum vector norm between input vector and N candidate primary color in addition to 4 achromatic primary colors is selected as output color. As a result of experiments, the proposed method showed visually pleasing halftone output.

• Journal of the Korea Institute of Building Construction
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• v.15 no.6
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• pp.607-614
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• 2015

Generally surface finishing of building is done with water paint that performs basic water repellency and resisting. When painting the exterior of the building with water paint, application method is easy and inexpensive and it has the advantage of building maintenance. But surface finishing of water paint is easy to discolored or aging due to ultraviolet light so the effect is not satisfying than expected. Therefore this study is to analyze durability of water-repellent paints mixed with water-repellents as outer surface finishing materials, and evaluate its feasibility. Color change and color different due to the accelerated time were tested, and the feasibility was evaluated based on the test results. The experimental results of color different, brightness different and chromaticity suggested that water-repellent paints mixed with water-repellents were suitable for finishing materials. Considering overall general durability performances, stable mixing ratios were 2, 5, and 8%.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2004.05a
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• pp.309-311
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• 2004

수용성 양이온 안료인 RhB를 대상으로 회전원판 광촉매 반응기와 열처리와 비열처리 방법으로 코팅된 고정화 광촉매를 이용하여 색 제거실험을 수행한 결과 다음과 같은 결론을 얻었다. 1. 회전원판 광촉매 반응기의 경우 설치하는 회전원판의 개수가 증가하면 반응면적의 증가로 반응속도가 증가하지만 일정 거리이하로 설치되면 광과 원판과의 접촉이 방해받아 반응면적 증가 효과를 감소시키는 역할을 하며, 원판 사이의 최적 거리가 존재하는 것으로 나타났으며, 본 실험범위에서는 약 11.2 mm인 것으로 나타났다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1997.11a
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• pp.115-119
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• 1997

본 논문은 색료의 삼원색인 빨강, 노랑 및 파랑을 적절히 혼합하는 경우에 나타나는 색채를 추론하는 문제에 대하여, 퍼지이론을 적용하여 결과를 추론하는 문제를 다루고 있다. 즉, 인간이 색료의 혼합에 있어서 행하는 과정을 모사한 퍼지규칙을 바탕으로 삼원색의 색료가 일정 분량씩 혼합된 경우, 결과적으로 나타나는 색을 직접 실험을 통하지 않고 추론할 수 있는 시스템을 구축하고 있다. 또한, 구축된 시스템에 대하여 여러 가지 예를 통한 모의 실험을 수행하여 본 연구에서 구축된 색채혼합 시스템의 타당성을 검증하였다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.45 no.4
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• pp.50-58
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• 2008

In this paper, we propose a color transient improvement (CTI) algorithm based on image fusion to improve the color transient in the television(TV) receiver or in the MPEG decoder. Video image signals are composed of one luminance and two chrominance components, and the chrominance signals have been more band-limited than the luminance signals since the human eyes usually cannot perceive changes in chrominance over small areas. However, nowadays, as the advanced media like high-definition TV(HDTV) is developed, the blurring of color is perceived visually and affects the image quality. The proposed CTI method improves the transient of chrominance signals by exploiting the high-frequency information of the luminance signal. The high-frequency component extracted from the luminance signal is modified by spatially adaptive weights and added to the input chrominance signals. The spatially adaptive weight is estimated to minimize the ${\iota}_2-norm$ of the error between the original and the estimated chrominance signals in a local window. Experimental results with various test images show that the proposed algorithm produces steep and natural color edge transition and the proposed method outperforms conventional algorithms in terms of both visual and numerical criteria.

• Journal of the Korea Society of Computer and Information
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• v.15 no.1
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• pp.103-109
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• 2010

As color was used for formative language since a human activity was beginning, all the symptoms in the world that the human eye can see is present. In this paper, we identify Korea traditional color harmony for extracted key frames from scene change detection. Traditional color is classified as 5-Jung-color and 5-Kan-color, and determine whether to harmony. Red, blue, yellow, black, and white, called 5-Jung-color and pink, blue, purple, sulfur, and green, called the 5-Kan-color was identified. First, we extract edge using Canny algorithm. And, we are labeling and clustering colors around the edge. Finally, we identify the traditional color using identification method of traditional color harmony. The proposed study in this paper has been proven through experiments.

• The Korean Journal of Mycology
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• v.44 no.3
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• pp.171-175
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• 2016

A gram-negative bacterium was isolated from spent substrates of Agaricus bisporus and showed significant antagonistic activity against Pseudomonas agarici. The bacterium was identified as Alcaligenes sp. based on cultural, biochemical, physiological characteristics and a 16S rRNA sequence analysis. The isolate is saprophytic, but not parasitic or pathogenic on cultivated mushroom, whereas it showed strong inhibitory effects against P. agarici cells in vitro. The control efficacy of Alcaligenes sp. HC12 against brown blotch of P. agarici was up to 63% on Agaricus bisporus. The suppressive bacterium may be useful for the development of biocontrol systems.

• Journal of Mushroom
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• v.17 no.1
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• pp.19-23
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• 2019

A gram-positive bacterium was isolated from the spent substrate of Agaricus bisporus that showed a marked antagonistic activity against Pseudomonas agarici. It was identified as Bacillus safensis HC42 based on its cultural, biochemical, and physiological characteristics, and 16S rRNA sequence. B. safensis HC42 was saprophytic, but not parasitic or pathogenic, in cultivated mushrooms and showed strong inhibition of P. agarici in vitro. Moreover, it showed a control efficacy of 66 % against browning disease caused by P. agarici in Agaricus bisporus. Therefore, B. safensis HC42 may be useful in the future for the development of a biocontrol system.

• Journal of Conservation Science
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• v.28 no.1
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• pp.29-37
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• 2012

This study discusses a mercury amalgam gilding technique and examines how the color, surface and section of the gilt layer changes as the condition of heat treatment with mercury amalgam gilt object is changed. Some previous studies have mentioned reasons for various colors on gilt bronze artifacts depending on gilding manufacture and environment. However, reason for reddish color with gold on the artifacts' surface brought on high temperature corrosion has yet to be discussed and analyzed. A methodology was found in representing the mercury amalgam gilding technique and heat treatment test. According to the result of the heat treatment test, in the conditions of higher temperature and longer time, the oxidized layer on the gilt layer was distributed more widely and in the part when the oxide layer was eliminated, the gilt layer with a reddish color was observed. Moreover, in the surface observation of the specimen on which yellow and reddish colors were agitated, the changing aspects of its surface condition differed by colors. When investigated the section, it was observed that the void density and size became larger. After a test, the surface components changed; the temperature of heat treatment increased, component ratio of Hg and Au decreased gradually but component ratio of Cu increased. In regard to the gilt layer, as the time was longer and the temperature became higher for the heat treatment, the component ratio of Au and Cu by layers tended to change in inverse proportion. It is concluded that gilding techniques and the burial environment can make a difference in the surface color of the gilt layer on the gilt bronze artifacts, the high temperature corrosion that occurs by heat after they are manufactured is also one of the factors that affects their surface color.

• Science of Emotion and Sensibility
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• v.16 no.4
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• pp.557-566
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• 2013

This study is to investigate the color emotion associations of the color vision defectives, considering that the colors do have an effect on human emotional conditions. To realize this investigation, firstly we selected 100 normal persons (group C)and other 34 color vision defectives(group A), dividing the last group into two small groups as protanomaly group(group P) with 8 persons and deuteranomaly group(group D) with 16 persons. All participants have been offered to select one color from ten colors for each of three positive emotions such as 'favorite', 'happy' and 'friendly' and of three negative emotions like 'sad', 'disliked' and 'awkward'. And they selected another one color for each active and passive emotions. For 'favorite color' the group C selected 'blue' and 'red' while the group A chose 'blue'. For 'happy color' the two groups selected 'yellow'. For 'friendly color' the group C chose 'green', but the group A selected 'blue'. For 'sad color' the group C preferred 'blue', but the group A chose 'purple'. For 'disliked color' all groups selected 'bluish green'. For 'awkward color' the two groups preferred 'bluish green'. For 'active color' all groups selected 'red'. And for 'passive color' the group C chose 'bluish green', but the group A selected 'blue'. Depending on the type of color vision deficiency(group P and group D) some more differences were revealed relatively. These results should be applied to develop some intelligent color conversion technology for enhancing the usability of culture contents for color vision defectives.