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적색 양자점 필름을 이용한 백색 발광 다이오드의 연색성 개선에 대한 광학 시뮬레이션 연구
이기정,홍승찬,이정균,고재현,Lee, Gi Jung,Hong, Seung Chan,Lee, Jung-Gyun,Ko, Jae-Hyeon 한국광학회 2021 한국광학회지 Vol.32 No.4
조명에 사용되는 일반적인 백색 발광 다이오드는 청색 발광 다이오드 위에 황색 형광체를 입힌 구조가 보편적이나 발광 스펙트럼상 짙은 적색 성분이 부족해서 조명의 연색성이 떨어지는 문제가 있다. 본 연구에서는 백색 발광 다이오드의 연색 특성을 개선하기 위해 적색 양자점 조명을 백색 조명의 확산판에 적용한 후 광학 시뮬레이션을 이용해 광구조를 최적화하고자 하였다. 양자점의 평균 자유 행정 및 확산판 내 TiO<sub>2</sub> 입자의 농도를 조절해 연색지수, 휘도 등 광특성을 조사했다. 대부분의 조건에서 연색지수는 90을 넘었고 이는 적색 양자점 필름의 적용이 일반적인 백색 발광 다이오드의 연색 특성을 개선하는 데 효과적인 방법임을 보여준다. 색좌표의 각도 의존성은 확산판과 조명 하단의 반사판 사이에 형성되는 광학적 공동 구조를 활용함으로써 제거할 수 있었는데 이는 공동 내 위치한 양자점 필름을 통한 빛의 다중 투과가 시야각에 따른 광경로의 차이를 줄였기 때문으로 해석된다. Conventional white light-emitting diodes (LEDs) for lighting applications consist of blue LEDs and yellow phosphors, the spectrum of which lacks deep red. To improve the color-rendering characteristics of white LEDs, a red quantum-dot film was applied to the diffuser plate of LED lighting. The mean free paths of the quantum dots and the concentration of the TiO<sub>2</sub> particles in the diffuser plate were adjusted to optimize the optical structure of the lighting. The color-rendering index (CRI) was greater than 90 for most conditions, which demonstrates that adoption of the red quantum-dot film is an effective way for improving the color-rendering properties of conventional white LEDs. The angular dispersion of color coordinates could be removed by utilizing the optical cavity formed between the diffuser plate and the reflector on the bottom of the lighting, where multiple passages of the light through the quantum-dot film reduced the differences in optical path length depending on the viewing angle.
이기정 광주보건대학 1998 論文集 Vol.23 No.-
To fully grasp what effects Nathaniel Hawthorne achieves in his works through the technique of irony, this paper will study the main characteristics of his irony, including the correlation between irony and his tragic works, and then its application to his works through three short tales: "The Man of Adamant: An Apologue," "The Gentle Boy," and "The Birth Mark." Then, his irony has close paralleles with his personal experiences and history. Born of a strict Puritan family, he had a thorough knowledge of his ancestors' gloomy history especially relating to the religious persecution directed at Quakerism. These circumstances and the Calvinistic influence gave Hawthorne a dualistic view of life and made him devote himself to write ironic works inseparably connected with Puritanism. Therefore, almost all of the characters in his tales are Puritans who are innocent American Adams striving to create an ideal world in their own way. But beyond their first intentions or expectations they come to be isolated from their normal societies, such that they become the heroes of tragic irony in the end. Their falls are brought about not merely by the religious prejudice or conceit like those of Richard Digby in "The Man of Adamant: An Apologue" and all the Puritans or the Quakers except the Tobias Pearsons and Ilbrahim in "The Gentle Boy," but also by the pursuit for the power of knowledge to gain the perfect world like that of Richard Aylmer in "The Birth Mark." Making good use of the technique of Dramatic irony, Hawthorne criticizes the dehumanization in Puritan society through the tragic development of his characters. But here it must be noted that his chief interest lies rather than in the transformation of the protagonists in "The Gentle Boy" than their sins. Even though among Hawthorne's characters there are such creatures as Digby or Aylmer facing a tragic fall without realizing his sin or transformation at all, they paradoxically show us the truth that real salvation is achieved by recovering magnetic chain of human relationships.
李基定,崔東浩,金昌國,盧興圭 충남대학교 의과대학 지역사회의학연구소 1976 충남의대잡지 Vol.3 No.2
Authors experienced five cases of adult diphtheria which is relatively uncommon in Korea during last winter. All cases were pharyngeal diphtheria and had relatively mild symptoms an dclinical course. A particularly noticeable finding was massive cervical lymphadenopathy, so called "bull neck", which observed on four cases. Four cases were recovered with antiserum and penicillin therapy. One patient died with the complication of myocarditis.