(A) study on electrically-driven tunable plasmonic color filters

학위논문(석사) - 한국과학기술원 : 전기및전자공학부, 2018.2,[iv, 36 p. :]나노 구조체를 이용한 색 재현은 고화질 디스플레이 구현을 위한 기술로 기대되며 연구되고 있는 분야이다. 기존 염료 및 안료 기반의 컬러 필터와는 다르게 수백 나노미터, 수 마이크로미터 수준에 이르는 초미세 픽셀 구현 가능성을 보이고 있기 때문이다. 그러나 이와 같은 나노 구조체를 이용한 색 재현 기술에 대한 한계로 지적되는 것 중 하나는, 한 번 구조가 형성된 후에는 구현되는 색을 능동적으로 변환하기가 힘들다는 점이다. 따라서 본 학위논문에서는 나노 구조체를 이용해 색을 재현하면서도 전압 구동을 통해 능동적인 광 변환이 가능하도록 하는 방법에 대해 고찰한다. 물질의 광학적 특성, 구조 변수 등을 조절하는 방법을 탐색하고 적용 방법을 모색하여 능동적 광 변환의 가능성을 시뮬레이션을 통해 확인하고자 한다.한국과학기술원 :전기및전자공학부

사유화와 국가의 역할 : 1989년부터 1997년까지 폴란드와 체코의 비교사례연구

Thesis(masters) --서울대학교 대학원 :외교학과,2009.8.Maste

Survey Analysis of the Effects of North Koreans Exposure to South Korean Culture on Their Attitudes toward Unification

한류의 확산과 더불어 북한 사회에도 남한의 문화가 빠르게 전파되고 있다. 이에 따라 북한 내 남한 문화가 어떠한 경로로 확산되는지, 그리고 북한주민의 의식변화에는 어떠한 영향을 미치는지에 대한 연구가 최근 들어 활발히 진행되고 있다. 하지만 남한 문화의 확산이 북한주민의 통일의식에 미치는 영향은 연구에서 다루어지지 않았다. 본 연구는 서울대학교 통일평화연구원의 2011~2016년 북한이탈주민 의식조사 결과를 바탕으로, 북한주민의 남한 문화 경험이 그들의 통일의식 형성에 어떠한 영향을 미치는지를 실증적으로 분석하였다. 분석 결과, 남한 문화를 자주 경험할수록 통일을 더 가까이 예상하고, 통일을 북한과 자신에 더 이롭다 여기며, 남한 체제로의 통일을 보다 지지하는 것으로 나타났다. 이러한 관계는 장사의 경험, 타지역 방문, 남한에 대한 지식 등, 남한 문화접촉과 관련된 대안적 변수들을 통제한 이후에도 강하게 유지되었다. 아울러 미디어를 수용하는 북한주민의 정치사회화 정도에 따라 남한 문화의 경험이 갖는 영향력이 다르게 나타나는 것으로 밝혀졌다. 이러한 연구결과는 남북 간 문화 교류의 확대가 북한 사회에 긍정적 통일의식을 고취시키는 정책적 효용을 가질 수 있음을 시사한다.As so-called Hallyu spreads all over the world, South Korean culture has become popular even in North Korea. Recent studies have investigated through what channels South Korean culture has disseminated in North Korea and what impacts it has had on the minds of North Korean people. However, the question of how South Korean culture has shaped their attitudes toward unification has not been explored yet. Based on the survey data of 798 North Korean defectors collected from 2011 to 2016, a series of regressive analyses reveal that those who have been more often exposed to South Korean culture are more likely to form positive attitudes toward unification in such ways that: they expect unification to come sooner; they see unification as more beneficial both to North Korean society as a whole and to themselves; and they prefer unification led by South Korean systems. These relations remain solid even after controlling for other rival explanatory variables such as underground market experiences, geographical mobility, and knowledge about South Korea. Also, it is found that such effects of media contacts vary according to the level of the respondents political socialization during their residence in North Korea. These findings suggest that policies expanding sociocultural exchanges between South and North Koreas should be effective as they bring positive attitudinal changes regarding unification into the North Korean society

Restoration of Calvarial Defect Using a Variety of Xenogenous Tooth Bone Graft Material: Animal Study

Purpose: The purpose of this study was to evaluate the histological healing process of 3 different types of xenogenic tooth bone graft material and xenogenic bone graft material. Methods: Three types of human tooth bone graft material (chips, crowns, and roots) and BioOss (Geistlich Pharma AG, Wolhausen, Switzerland) was filled at the preformed 4 round-shaped calvarial bone defects of beagle dogs. The beagles were sacrificed at 2, 4, 8, and 12 weeks, respectively, for radiological and histological evaluation. Results: Increased strength and radiopacity were detected in all graft material groups in time-dependent manner. New bone was formed and matured surrounding the graft material histologically. Also, a new bone was directly integrated with graft material. Conclusion: It was expected that newly developed tooth bone graft material would show good bone healing capacity if it was used as a graft material for the restoration of bony defect.N

의치세정제와 소독제가 의치상 레진의 색조, 표면경도, 표면조도에 미치는 영향에 대한 연구

he purpose of this study is to compare effects of denture cleansers and disinfectants on the color. surface hardness, and surface roughness of reinforced acrylic resin using polyhedral oligosilsesquioxane molecules(POSS resin) to those of common resins. According to manufacturer's instructions, 45 specimens were made from three denture resins(Luciton 199, Paladent 20, POSS resin), and polished. Five denture cleansers(distilled water, glutaraldehyde, alkaline hypochlorites, chlorhexidine, alkaline peroxides) in combination with three denture resins were evaluated before and after immersion for 7 days. Color data in system were measured with a colorimeter. Surface hardness data were measured with a microhardness tester. Surface roughness data were measured with a 3-dimensional surface analyzer. Data were analyzed with two-way ANOVA, one-way ANOVA, and t-test. The results were as follows : 1. All resins(Luciton 199, Paladent 20, POSS resin) showed significant differences in color after immersion in hypochlorites(p<0.05). 2. POSS resin showed significant differences in color compared with Paladent 20 in all denture cleansers, but no statistically significant differences with Luciton 199(p<0.05). 3. Luciton 199 showed significant differences of surface hardness in chlorhexidine, Paladent 20 showed significant differences in glutaraldehyde and chlorhexidine. POSS resin showed a little change of surface in all denture cleanser, but no statistically significant differences(p<0.05). 4. Luciton 199 and Paladent 20 showed significant differences of surface roughness in hypochlorites and glutaraldehyde, and POSS resin showed no statistically significant differences in all denture cleansers(p<0.05).본 연구는 보건복지부 보건의료기술연구개발사업의 지우너에 의하여 이루어졌습니다

표면 처리법에 따른 치과용 합금과 열중합형 레진 간의 결합 강도에 관한연구

The purpose of this study is to compare tensile bond strength between Cr-Co alloy and three denture base resins after surface treatment. Following the manufacturer's instructions, 180 bonded specimens were made from three denture base resins (Lucitone 199. Paladent 20. POSS resin) and three surface treatment methods (sandblasting. metal primer. silicoating) 20 samples were made in each group and a half was ther-mocycled 1000 times between and . The tensile bond strength was measured using an Instron with 5mm/min crosshead speed. Data was analyzed with one-way ANOVA, T-test and Duncan test. The results were as follows : 1. Samples with metal primer coating had significantly high tensile bond strength than the other surface treated groups (p.05) 3. Tensile bond strength was decreased in silicoated samples after thermocycling (p<.05). 4. Of the surface treated groups with metal primer, Lucitone 199 had the greatest bond strength and POSS resin and Paladent 20 were followed (p<.05). 5. Of the surface treated groups with silicoating, POSS resin and Lucitone 199 had greater bond strength than Paladent 20 (p<.05).본 연구는 보건복지부 보건의료기술연구개발사업의 지원에 의하여 이루어졌습니다