• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.312-313
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• 2012

단청의 열화현상에 대한 연구는 주로 건축재로서의 내구성 향상에 초점을 두고 연구가 진행되고 있으나 본 연구는 가상유적지 재현을 위해 가상 건축물의 사실감을 높이기 위한 방안으로서 열화현상을 분석하고 가시화 하는데 초점을 두었다. 이를 위해 먼저, 전통건축에 나타나는 단청의 열화과정을 인간이 인지하는 색채감의 변화에 초점을 두고 연구를 진행한다. 우리나라 단청에서 사용된 안료를 살펴보고 문화재관리청에서 선정한 무기안료와 유기안료를 중심으로 내후성 시험을 통해 안료의 열화현상을 분석한다. 단청의 열화를 크게 색변과 박리 현상으로 나누어 촉진내후성시험기를 통해 얻어진 결과를 토대로 목조 전통건축의 열화현상을 분석한다.

• Journal of Conservation Science
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• v.33 no.6
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• pp.553-564
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• 2017

This report compared and analyzed the degree of surface change and results of a deterioration experiment to assess the possibility of using Dobak glue as an adhesive in the fossilizing treatment of the paint layer in earthen mural paintings. The weathering experiments were performed with a color-difference meter (CR-400, MINOLTA). After the experiment, Cinnabar 3% specimens, which exhibited diverse changes in the durability test, were additionally tested with a reflection-transmission device (CARY-5000, AGILENT). Post UV degradation, most of the Dobak-glue samples exhibited lesser color change than animal-glue samples, and after moisture absorption and drying, the 0.5% and 3% Dobak samples displayed a lower degree of change in the value of color difference. Furthermore, results of the reflection-transmission test after deterioration indicated that Dobak glue presented a lesser color change than animal glue. Therefore, if Dobak glue is used as a consolidating agent, discoloration on account of degradation is minimal.

• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.3
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• pp.400-405
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• 2004

Biliary atresia is defined as a complete obstruction of bile flow owing to destruction or absence of all or part of the extrahepatic bile ducts. This disease is occurring in approximately 1:10,000 live births and moderate predominance of female is noted. The etiology of biliary atresia remained unsolved. The signs and symptoms are hyperbilirubinemla, jaundice, clay-colored stools, steatorrhea, dark yellow urine and hepatomegaly. Currently biliary atresia is best managed by hepatic portoenterostomy with or without liver transplantation. Biliary atresia patients with these cases showed staining of the teeth. The stains ranged in color from yellowish-brown to deep green. Enamel hypoplasia was all erupted teeth present. Patients had poor oral hygiene and rampant caries.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.23 no.1
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• pp.37-45
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• 2017

To visually identify the spoilage of chicken breasts, a three layered freshness indicator consisting of PET/bromocresol green (BCG)-ethylene vinyl acetate (EVA)-acetic acid (AA) composite layer/porous substrates was successfully prepared and their performance were simulated at 20% of $CO_2$ and 4 different trimethylamine (TMA) concentrations to evaluate color change at minimal spoilage level. The visibility and range of color changes of the as-prepared indicators responding to TMA concentration as a simulant were strongly dependent on the concentrations of BCG and AA. As the BCG content increased, the visibility of color change in the freshness indicators was apparently improved and the range of color change could be controlled by contents of AA. Among the as-prepared freshness indicators, 'G0.12_A0.5' which consisting 0.12g of BCG and 0.5g of AA was selected as an optimum composition due to the highest visibility at TMA 20 mg% corresponding to the minimal spoilage level. The color of the indicator changed from yellow to green for spoilage indication of chicken breast, which could be easily seen with the naked eyes and well consistent with the simulation results. It is expected that our developed freshness indicator can be useful in monitoring various food freshness and quality.

• Journal of Conservation Science
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• v.33 no.6
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• pp.485-495
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• 2017

The purpose of this study is to evaluate the functionality and lightfastness of the natural pigments according to the type of Seokganju used as Dancheong. The commercially available red iron-oxide-based natural pigments that are called Seokganju and Daija manufactured by traditional methods in Korea and Japan were selected. The analysis of the constituent minerals and constituents of 8 kinds of collected Seokganju showed that most of them contained hematite. There are two types of Seokganju according to the $Fe_2O_3$ contents. The type of Seokganju can be characterized not only using the main component but also from the burn-out processing. The chromaticity results for Seokganju with a high $Fe_2O_3$ concentration indicate dark red or grayish brown, while those for Seokganju with a low $Fe_2O_3$ concentration indicate yellowish red or yellowish brown. Samples were prepared by mixing with a glue solution and functional properties were evaluated based on the opacity and spreadability. Coated samples were used in the lightfastness test. The spreadability and opacity of the pigments were measured differently depending on the main component. Most Seokganju samples a showed slight color change until $9,000kJ/m^2$ but rapid color changes were detected after $18,000kJ/m^2$. In particular, burnt Seokganju showed superior lightfastness.

• The Korean Journal of Mycology
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• v.36 no.2
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• pp.172-177
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• 2008

Mycelial growth of Pleurotus ostreatus isolates was examined on PDA media added with heavy metals to reveal effects of heavy metals on mycelial growth of the fungus. Cd and Cu strongly inhibited mycelial growth of three isolates of fungus tested. However, addition of $2{\sim}10\;mM$ Pb to growing media of white color mutant of fungus resulted in increase of the fungal growth rate. Addition of 2 mM Cr to the media resulted in increase of growth rate of the white color mutant and the dark color mutant of fungus. Mycelial growth rate of the white color mutant was relatively better than the other isolates on media added with Cr, Pb, Cu, or Mn, respectly. Tolerance of the white color mutans to heavy metals was higher than that of the black color mutant. It is suggested that tolerance of the white color mutant to heavy metals was not controled by color-related substance of the fungus.