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집적영상 방식 3D 디스플레이의 최적 입체감에 관한 분석
최희진,Choi, Hee-Jin 한국광학회 2012 한국광학회지 Vol.23 No.1
In this paper, an analysis of the optimized 3D depth of integral imaging is proposed. We achieve this by calculating the amount of image distortion and considering the threshold of recognition in the human visual system. Experimental results are also provided to test the theory. 본 논문에서는 집적영상방식 3D 디스플레이에서 문제점으로 지적되고 있는 입체감 증가에 따른 영상의 왜곡을 분석하고 인간 시각계의 인지한계에 근거하여 최적입체감을 구현할 수 있는 영역을 제안한다. 또한 실험결과를 통하여 이를 검증하였다.
유화 작품 색맞춤용 재료 특성 연구 - 복원용 물감과 아크릴과슈를 중심으로 -
최희진,강대일,Choi, Hee Jin,Kang, Dai Ill 한국문화재보존과학회 2021 보존과학회지 Vol.37 No.5
유화 색맞춤에 사용되는 복원용 물감과 아크릴과슈에 대하여 물감별 특성을 파악하고 자외선 및 흡습건조 열화실험을 통하여 복원재료로서의 내구성을 확인하였다. 4개 제조사에서 제작된 총 20종의 물감을 사용하였으며 분석 결과 동일한 색명의 물감일지라도 제조사별 성분 및 발색 특성 차이가 존재했다. 이는 제조 시 체질, 착색 안료로 사용된 안료의 차이에서 기인한 것으로 판단된다. 열화 후 대부분의 시료에서 𝚫E<sup>*</sup> 12.0 이상의 변색이 일어났으며, C사의 Viridian에서는 광택 변화도 관찰되었다. Lemon Yellow에서는 변색과 균열이 모두 관찰되었다. 균열은 복원용 물감인 B사의 것에서 가장 많이 발생했다. 이는 제조 시 사용된 수지의 영향인 것으로 추측되나 향후 정확한 원인 규명을 위해 변수를 통제하여 추가적인 연구가 진행되어야 할 것이다. 연구를 통해 색맞춤용 재료의 색 및 제조사에 따른 물리적 특성 차이가 확인되었으므로, 유화 보존처리자는 색맞춤 시 재료별 변색, 균열, 광택 변화와 같은 물리적 특성을 고려하여 복원재료의 선정 및 사용에 신중해야 할 것이다. In this study, we compare the properties and estimate the durability of five oil colors that are the most popularly used colors in the conservation of oil paintings. A set of these colors was obtained form four manufacturers each, and their properties were analyzed by conducting deterioration experiments. Subsequently, we observed the colors and performed X-ray fluorescence analysis. As a result of colour observation and XRF analysis, it was confirmed that there are the differences according to the pigment types, mixing rations and the manufacturers even for colors having the same product name. The deterioration test indicated differences in the appearance of the colors ; for instance, the color difference was above 12.0 in most of the samples, including restoration color and acrylic gouache. In the case of Lemon Yellow a lot of discoloration and cracking occurred, and difference in gloss was ob served in Viridian of manufacturer C. Most cracks were ob served in the restoration color obtained from manufacturer B and were assumed to be because of the resin used by the manufacturer. Nevertheless, additional research will have to be conducted by controlling variables in order to find out the cause. Through this study, we demonstrated that retouching materials for conservation of oil painting differed in their physical properties according to the color and manufacturer. Therefore a conservator should be mindful during the selection and use of materials for retouching oil paintings.
한국산 인삼의 Polyphenol 분획물의 항산화, Phospholipase $A_2$ 및 암세포증식 억제효과
최희진,한호석,박정혜,손준호,배종호,성태수,최청,Choi, Hee-Jin,Han, Ho-Suk,Park, Jung-Hye,Son, Jun-Ho,Bae, Jong-Ho,Seung, Tae-Su,Choi, Cheong 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.3
한국산 인삼을 60% acetone으로 추출하여 Sepadex LH-20 gel column chromatography, MCI-CHP 20 gel column chromatography, ${\mu}-Bondapack\;C_{18}$ gel column chromatography을 이용하여 polyphenol 분획물을 3종류를 분리하여 항산화 효과, phospholipase $A_2$ 저해효과 및 암세포 증식억제 효과를 검토하였다. 항산화 효과에서 분획물 I은 150 ppm에서 $Cu^{2+},\;KO_2$ 그리고 $H_2O_2$에 대하여 각각 48.16%, 79.71%, 43.55%를 나타내었고 DPPH 수소공여능은 분획물 II가 200 ppm에서 35.17%의 라디칼소거능을 보였다. 분획물 III는 $Fe^{2+}$, OH가 존재 시 150 ppm에서 48.49%, 25%의 항산화효과를 나타내었다. Phospholipase $A_2$ 저해활성은 분획물 III이 $60\;{\mu}/ml$에서 48.9%의 활성을 나타냈다. HT 29 cell에 대한 인삼의 세포 독성은 분획물 II에서 0.25 mg/ml에서 73.29%의 가장 높은 억제능을 나타내었다. The polyphenol fractions of Korean ginseng were purified using Sephadex LH-20, MCI gel, Bondapak $C_{18}$ TLC, and HPLC from the 60% acetone soluble fraction. Fraction I showed 48.16%, 79.71% and 43.55% inhibition at 150 ppm against lipid oxidation in the presence of copper ion, superoxide and hydrogen peroxidation. Electron donating abilities of fraction II showed 35.17% inhibition at 200 ppm. Fraction III showed 48.49% and 25% inhibition at 150 ppm against lipid oxidation in the presence of ferrous ion and hydroxy radical ion. The phospholipase $A_2$ inhibitory effect of fraction III was 48.9% at the concentration of $60\;{\mu}g/ml$. The cytotoxic effects of fraction II was the highest (73.29% at 0.25 mg/ml) among the tested polyphenol fractions.
일반청소년과 비행청소년이 지각한 가족기능도와 그에 따른 스트레스 대처방식
최희진(Choi Hee Jin),유영주(Yoo Young Ju) 한국가족학회 2004 가족과 문화 Vol.16 No.1
The purpose of this study was to compare family functioning as rated by non-delinquent and delinquent adolescents to examine difference sin perceived family functioning and stress coping strategies as well as the impact of individual and the family socio-demographic variables. Data were collected from 253 participants: a group of adolescents ages 14-17 who had no experience of delinquency, and a group of juvenile delinquents in a correctional institute. Results were as follows: first, non-delinquent adolescents perceived family functioning more positively than juvenile delinquents, indicating that family interaction could have much effect on adolescent delinquency. Second, non-delinquent adolescents who were collectivistic perceived family functioning more positively than non-delinquent adolescents who were individualistic. In addition, non-delinquent adolescents' perception of family functioning differed by social and economic class. In contrast, juvenile delinquents’ ratings of family functioning did not differ by family socio-demographic variables. Third, juvenile delinquents used the strained emotion easing strategy while non-delinquent adolescents favored the problem avoidance strategy. Fourth, with regard to the impact of individual and family socio-demographic variables on stress coping strategy, individualistic versus collectivistic tendency affected stress coping strategy, but stress coping strategy did not differ by family socio-demographic variables. This suggests that family interaction was more important to adolescents' development than was family structure. Fifth, hierarchical regression was conducted to investigate the relative effect of individual, family socio-demographic, and family functioning variables on stress coping strategy. Positive family functioning (especially family rules and respect for autonomy) was associated with effective stress coping strategies
연구논문 : 천연모발염색 소재인 남천(Nandina domestica) 잎 추출물의 생리활성 연구
최희진 ( Hee Jin Choi ) 한국미용학회 2015 한국미용학회지 Vol.21 No.1
This study was to examine the effect of antioxidant and antimicrobial activity with 80% ethanol extracts of Nandina domestica leaves. Antioxidant activity of Nandina domestica leaves onto free radical generation was determined by measuring DPPH radical scavenging activities in vitro. Antimicrobial activity was tested against Staphylococcus epidermidis, Staphylococcus aureus subsp. Aureus, Pseudomonas aeruginosa, and Pityrosporum ovale. Antioxidant activity of ethanol extracts of Nandina domestica leaves was 94.5% in the DPPH assay at 400 μg/ml. Antimicrobial activity of ethanol extracts of Nandina domestica leaves was that Pityrosporum ovale was higher than others microorganism at 100 μg/ml. These results demonstrate that Nandina domestica leaves may be useful in the materials of natural hair dye.
경상도 전통 마른 오징어 식해로부터 젖산균의 분리 , 동정 및 숙성과정 중 유기산의 변화
최희진(Hee Jin Choi),김성(Sung Kim),최청(Cheong Choi),이희덕(Hee Duck Lee),성태수(Tae Su Seung) 한국응용생명화학회 2001 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.3
The objective of this study is to investigate identification of lactic acid bacteria and changes of organic acid during aging of traditional Kyungsando Squid sikhe. Lactobacillus brevis SH-1, Lactobacillus plantarum SH-2, and Leuconostoc mensenteroides SH-3, which were isolated from Kyungsando Squid sikhe were selected for fermentation. The viable cell and lactic acid bacteria counts of squid sikhe was increased on fermentation days, and slowly decreased after 10 days of fermentation. The viable cell and lactic acid bacteria counts of standard sikhe at 6 days fermentation was 3.7×10^9 and 8.2×10^8 CFU/g, respectively. The organic acid of squid sikhe consisted of 7 kinds including lactic acid during fermentation. The contents of citric acid, succinic acid, and lactic acid gradually increased during fermentation, and especially, increasing of lactic acid remarkably increased than the different organic acid. The contents of acetic acid and tartaric acid slowly increased after 7 days of fermentation.