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(100) 및 (111) 배향을 갖는 CaF<sub>2</sub> 단결정 기판의 결함 분석
최예진,강민규,이기욱,박미선,정광희,정해균,김두근,이원재,Ye-Jin Choi,Min-Gyu Kang,Gi-Uk Lee,Mi-Seon Park,Kwang-Hee Jung,Hea-Kyun Jung,Doo-Gun Kim,Won-Jae Lee 한국결정성장학회 2024 한국결정성장학회지 Vol.34 No.1
The CaF<sub>2</sub> single crystal has notable characteristics such as a large band gap (12 eV), excellent transparency over a wide wavelength range, low refractive index and dispersion. Due to these outstanding properties, CaF<sub>2</sub> single crystal has considered as a promising material for short-wavelength light sources in recent lithography processes. However, there is an inherent birefringence of the material at 157 nm and the resulting aberration can be compensated for through the combination of the (100) plane and the (111) plane. Therefore, it is necessary to investigate the characteristics according to the plane. In this study, we analyzed crystallinity, optical properties of commercial CaF<sub>2</sub> single crystal wafers grown by the Czochralski method. In particular, through chemical etching under various conditions, it was confirmed that the shape of etch pits appears differently depending on the plane and the shape and array of specific etch pits affected by dislocations and defects were examined.
군중행동 및 밀집 위험도 평가 모델 개발을 위한 기초연구 - 군중행동연구 고찰을 중심으로 -
최예진(Choi, Ye-Jin),한기성(Han, Gi-Sung),이경훈(Lee, Kyung-Hoon) 대한건축학회 2024 대한건축학회 학술발표대회 논문집 Vol.44 No.1
The ultimate aim of this study is to propose a model of Crowd Behavior and Density Risk Assessment. As a preliminary step, previous researches on crowd behavior were studied and analyzed in terms of methods of the research. They were analyzed by dividing experimental methods into animal experiments, controlled laboratory experiments with human subjects, evacuation drill experiments, virtual reality (VR) and hypothetical choice (HC) experiments, simulations and empirical methods such as analysis of pedestrian crowds’ movement in natural environments, analysis of disasters, and post-disaster interview with survivors. Based on the summary, ideas for the future research were suggested as follows; Analysis of pedestrian crowds’ movement in natural environments can be used as an effective tool for crowd behavior and should be quantified through simulation to complement each other.
접이식 로봇팔의 태양광 패널 청소를 위한 조류 분비물의 클러스터링에 대한 연구
최예진(Ye Jin Choi),정슬(Seul Jung) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.12
This study presents clustering algorithms for the cleaning task of bird droppings on a solar panel using a foldable robot arm of a drone. Before the robot arm performs the cleaning task of bird droppings, a clustering task is required for a selective cleaning performance. In this study, two clustering algorithms were utilized: K-Means and self-organizing map (SOM). As the two algorithms exhibited different characteristics, appropriate strategies were required for cleaning different shapes of clusters to minimize the cleaning time. Accordingly, an efficient algorithm for selecting a suitable clustering method was proposed. The strategic algorithm was tested for several pattern examples on a solar panel.
최예진(Choi, Ye Jin),한상필(Han, Sangpil) 한국광고홍보학회 2014 광고연구 Vol.0 No.102
본 연구는 가상광고가 많이 등장하는 프로야구 중계 프로그램에 삽입되는 가상광고를 대상으로 내용분석을 실시하였다. 분석 유목은 경기장 및 경기 요소, TV 화면을 고려한 가상광고의 등장위치, 광고의 크기, 크리에이티브에서 청각적 요소와 시각적 요소, 카피 등이었다. 연구 결과, 연도별 가상광고 등장 위치의 빈도에 차이가 있는 것으로 나타났으며, 전체 가상광고 중‘외야 그라운드’와 ‘내야 배터리샷’의 빈도(26.6%)가 가장 높게 나타났다. TV 화면에 의한 등장위치에서는 하단 오른쪽에 나타나는 광고의 비율이 전체의 47.6%로 가장 높게 나타났으며, 특히 2013년에서는 74.7%를 기록하며 상당한 비중을 차지하였다. 등장시점은 이닝 진행 중(65.1%)의 빈도가 가장 높았으며, 크리에이티브 요소로서 시각적 요소 중 모델의 등장 여부는 연도별로 차이가 있었다. 또한 3D그래픽으로 제작된 가상광고(69.8%)가 2D 그래픽으로 제작된 광고(30.2%)에 비해 높은 빈도를 보였고 정적 이미지(19.5%)보다 동적이미지(80.5%)의 비율이 월등히 높았다. 제시형태에 있어서는 고정형(95.6%)이 이동형(4.4%) 보다 훨씬 높은 빈도를 보였고 카피 중에서는 레이블형(23%)과 뉴스형(12.9%)의 빈도가 높게 나타났다. 본 연구는 2010년부터 2013년까지 프로야구에 실제 집행된 가상광고의 내용분석을 통해 스포츠 경기에 삽입된 가상광고의 유형과 시각적 크리에이티브와 카피의 빈도를 살펴 본 것으로 이론적 기여도는 높지 않지만 향후 가상광고의 연구에 있어 기초자료로 사용될 수 있을 것으로 기대된다. Virtual advertising is one of the new advertising types which had got high attention because of its ability to reduce audiences’ negative reaction such as zapping. The effect of virtual advertising would be differed by when the advertisement exposes in the game situation or by how the advertisement looks like on the TV screen. Virtual advertising should show noticeable creative to viewers because it’s hard to have long message. The purpose of this study is to investigate the types and creative of virtual advertising affecting the effect of virtual advertising. For this purpose, the author conducted contents analysis using games of Korea Baseball league broadcasted 2010 to 2013. Analysis units are exposure location basis on game feature/TV screen, size of advertisement, auditory element, visual elements, and copy. The results of this study show that the frequency of exposure location is different by year. The most frequent exposure location is ‘outfield ground(26.6%)’and ‘right-bottom(47.6%)’on the TV screen. 65.1% of advertisements are shown ‘during the play.’ Appearance of model in advertisement as visual element of creative has difference by year, and this difference is significant(χ2(df)=124.340(3), p< .001). Advertisements made with 3D graphics(69.8%) appear more frequently than made with 2D graphics(30.2%), and moving image(80.5%) uses much more than non-moving image(19.5%). In the type of presentation, the frequencies of fixed type(95.6%) is much higher than moving type(4.4%). The frequencies of label type(23%) and news type(12.9%) are highly observed.
최예진 ( Ye Jin Choi ),( Ji-ae Chang ),( Young Ah Kim ),( Sun Hee Chang ),( Kyoung Chul Chun ),( Jae Whoan Koh ) 대한산부인과학회 2016 대한산부인과학회 학술대회 Vol.102 No.-
Objective: To determine if neuroalament (NF) is expressed in the endometrium and the lesions of myomas and adenomyosis, and to determine their correlation. Methods: Histologic sections were prepared from hysterectomies performed on women with adenomyosis (n=21), uterine myoma (n=31), and carcinoma in situ of the uterine cervix. Full-thickness uterine parafἀn blocks, which included the endometrium and myometrium histologic sections, were stained immunohistochemically using the antibodies for monoclonal mouse antihuman NF protein. Results: NF-positive cells were found in the endometrium and myometrium in 11 women with myoma and in 7 with adenomyosis, but not in patients with carcinoma in situ of uterine cervix, although the difference was statistically not significant. There was no significant difference between the existence of NF-positive cells and menstrual pain or phases. The NF-positive nerve fibers were in direct contact with the lesions in nine cases (29.0%) of myoma and in five cases (23.8%) of adenomyosis. It was analyzed if there was a statistical significance between the existence of NF positive cells in the endometrium and the expression of NF-positive cells in the uterine myoma/adenomyosis lesions. When NF-positive cell were detected in the myoma lesions, the incidence of NF-positive nerve cells in the eutopic endometrium was significantly high. When NF-positive cell were detected in the basal layer, the incidence of NF-positive nerve cells in the myoma lesions and adenomyosis lesions was significantly high. Conclusion: We assume that NF-positive cells in the endometrium and the myoma and adenomyosis lesions might play a role in pathogenesis. Therefore, more studies may be needed on the mechanisms of nerve fiber growth in estrogen-dependent diseases.
K-means 알고리즘을 이용한 태양광 패널 표면의 조류 분비물 검출
최예진(Ye-Jin Choi),정슬(Seul Jung) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11
The efficiency of solar power generation is greatly affected by the clean condition of solar panels. Pollution of solar panels due to bird’s droppings is to reduce power generation by about 10 percent. In order to increase the efficiency of solar power generation, cleaning solar panel is necessary. In order to automate the cleaning process by drones, in this paper, a K–mean algorithm is implemented to identify contaminated area in a solar panel so that a robot arm in drone can clean solar panels.