비정질 실리콘 박막 트랜지스터의 광특성 분석을 위한 백라이트의 광자 에너지 스펙트럼에 대한 연구

정경서,권상직,조의식,Jeong, Kyung-Seo,Kwon, Sang-Jik,Cho, Eou-Sik 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12

For the investigation of the mechanism of photoelectric characteristics of a hydrogenated amorphous silicon thin film transistor(a-Si:H TFT), spectral characteristics of various backlights were analyzed in terms of the photon energy at each wavelength. Photon energy spectral characteristics were obtained through the multiplication of each photon energy and spectral intensities of backlights at each wavelength and the total photon energies were obtained by the integration of the photon energy spectrums. From the comparison of the experimental photo leakage current and the calculated photon energy, it was possible to conclude that the absorption of illuminated backlight to a-Si:H layer and the generation of electrons and holes are mainly carried out at the wavelength less than 500 nm as described in previous reports.

Ir-RE 코팅 대비 자장여과필터방식을 이용한 비구면 유리 렌즈용 초경합금(WC)표면의 ta-C 박막 코팅 성능 개선 연구

정경서,김승희 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.12

작은 굴절률 및 높은 굴절률을 갖는 저 분산 렌즈에 대한 요구가 증가함에 따라, 높은 내열성 및 내마모성을 갖는 이형성 보호 필름에 대한 필요성이 증가하고 있다. 그러나 광학 산업은 비구면 유리 렌즈 성형에 사용되는 이형 보호 필름의 제조 공정 및 품질 표준에 대한 명확한 표준을 아직 확립하지 못했다. 이 기술은 광학 렌즈를 제조하는 각 회사의 노하우로 취급된다.  본 연구에서는 FCVA (Filtered Cathode Vacuum Arc) 기반 ta-C 박막 코팅의 이온 에칭, 각 소스 및 필터부의 마그네트론 및 아크 전류, 바이어스 전압의 최적화에 관한 실험을 수행하였다. 그 결과, 코팅 성능 측면에서, 이리듐- 레늄 합금 박막 스퍼터링 제품 대비 필름 두께가 약 50% 얇고, 경도는 약 20%, 박막의 접착 강도는 약 40 % 개선된 것으로 측정되었다. 본 연구의 박막 코팅 공정 결과는 금형 이형 박막층의 최소 기계적 특성 및 품질 확립을 위한 유리 렌즈의 개발 및 활용에 크게 기여할 것으로 사료된다. The demand for a low dispersion lens with a small refractive index and a high refractive index is increasing, and accordingly, there is an increasing need for a releasable protective film with high heat resistance and abrasion resistance. On the other hand, the optical industry has not yet established a clear standard for the manufacturing process and quality standards for mold-releasing protective films used in aspheric glass lens molding. Optical lens manufacturers treat this technology as proprietary information. In this study, an experiment was conducted regarding the optimization of ion etching, magnetron, and arc current at each source and filter part, and bias voltage in FCVA (filtered cathode vacuum arc)-based Ta-C thin film coatings. This study found that compared to iridium-rhenium alloy thin film sputtering products, the coating conditions were improved by approximately 50%, 20%, and 40% in terms of thickness, hardness, and adhesive strength of the film, respectively. The thin-film coating process proposed in this study is expected to contribute significantly to the development and utilization of glass lenses, which will help enhance the minimum mechanical properties and quality of the mold-release thin film layer required for glass mold surface forming technology.

[특별기고] 朝鮮의 聖者를 찾아

鄭景玉(정경옥) 대한기독교서회 2016 基督敎 思想 Vol.695 No.-

군용 DC-DC Converter의 시험 절차 및 규격

정경진(鄭慶振),김경일(金慶一) 전력전자학회 2007 전력전자학회지 Vol.12 No.6

CIGS 태양전지의 윈도우 층에 적용되는 ZnO 박막 특성에 관한 온도의 영향

정경서,권상직,조의식,Jung, Kyung Seo,Kwon, Sang Jik,Cho, Eou Sik 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.4

For the application to the window layer of $Cu(In,Ga)Se_2$(CIGS) solar cell, zinc oxide(ZnO) thin film was deposited at various temperatures by in-line pulsed DC sputtering. From the structural, optical, and electrical investigation and analysis, it was possible to obtain the lower thickness, the lower resistivity, and the higher transmittance at a higher process temperature. The energy band gap of ZnO was calculated using the transmittance data and was analyzed in terms of the dependency on temperature. From the X-ray diffraction(XRD) results, it was possible to conclude that a dominant peak was found about $34.2{\sim}34.6^{\circ}$(111) and crystallinity was obtained at a temperature above $150^{\circ}C$.

화엄사 서오층석탑 발견 「무구정광다라니」의 서지적 연구

정경재,박부자 한국서지학회 2016 서지학연구 Vol.65 No.-

Hwaeomsa dharani is the only material with which we can reconstruct the overall aspects of Mugujeonggwang dharani distributed during unified Silla. Despite its value as significant material, it has not been much noticed so far unlike other 「Mugujeonggyeong」 materials transmitted from unified Silla. Therefore, this author aims to reveal its value as significant material by examining the contents, patterns of transcription, marks of correction, and the New Characters of Wu Zetian. Regarding it, this study has found some characteristics of Hwaeomsa dharani and summed them up as follows: first of all, only the dharani was transcribed, excluding the Buddhist scriptures of 「Mugujeonggyeong」. The characters needed to recite the dharani were not transcribed. Six dharanis form a set and are transcribed repetitively, and they are transcribed 28 times at least. Also, in the beginning of each session, the title of a dharani, ‘最勝無垢清淨光明大根夲陁羅 ’, is transcribed. After transcribing six dharanis once, one or two blank lines are left for division before transcribing the next ones. There is space between Chinese characters to distinguish a dharani from another within a session. With these characteristics, we can see one of the concrete ways to produce mugujeonggwang dharani for enshrinement used during unified Silla. Hwaeomsa dharani was transcribed not for reciting but purely for enshrinement. Meanwhile ‘卜’ was used for deletion marks. This is the earliest example of using ‘卜’ for a deletion mark in Korea. In addition that, marks for reversal or repetition are also found. As in other Silla scriptures, ‘埊’, the new characters of Wu Zetian, was also used. 화엄사 다라니는 통일신라시대에 유통된 무구정광다라니 전체 모습을 재구할 수 있는 유일한 자료로, 그 자료적 가치에도 불구하고 그동안 통일신라시대의 다른 「무구정경」 자료에 비해 큰 관심을 받지 못하였다. 이에 본고는 화엄사 서오층석탑 출토 다라니의 내용과 필사 양식, 부호, 측천무후자의 사용 등을 살펴 그 자료적 가치를 드러내고자 한 것이다. 이와 관련하여 본고에서 확인된 화엄사 다라니의 특징 몇 가지를 정리하면 다음과 같다. 먼저, 화엄사 다라니에는 「무구정경」의 경문을 제외한 다라니만 필사되어 있으며, 다라니 내 다라니의 암송을 위한 표시들은 필사되어 있지 않다. 여섯 개의 다라니가 한 세트가 되어 반복적으로 필사되었고 최소 28회 필사되었다. 또 매회의 시작 부분에 다라니명 ‘最勝無垢清淨光明大根夲陁羅 ’를 필사하였다. 여섯 개의 다라니를 한 차례 필사하고 다시 다음 차례의 다라니를 필사할 때에는 空行을 두어 구분하는 경향을 보였고, 한 회 안에서 다라니와 다라니를 구별할 때에는 隔字를 두는 경향을 보였다. 이와 같은 사실을 통해 통일신라 시대에 납탑용 무구정광다라니를 제작하는 하나의 구체적인 방식을 확인할 수 있었으며, 화엄사 다라니가 암송을 위한 것이 아니라 순수하게 납탑을 위해 필사된 것임을 알 수 있었다. 한편, 삭제부로는 ‘卜’이 사용되었는데 이는 우리나라에서 삭제부 ‘卜’이 쓰인 매우 이른 시기의 용례이다. 이 외에도 전도부, 반복부 등의 부호가 확인되었으며, 다른 신라 사경처럼 측천무후자 ‘埊’도 사용했음이 확인되었다.

화엄사 서오층석탑 발견 무구정광다라니의 필사 저본 재구와 그 가치

박부자(Pakh, Bu-ja),정경재(Chung, Kyeong-jae) 한국목간학회 2016 목간과 문자 Vol.0 No.16

화엄사 서오층석탑 발견 무구정광다라니는 가장 많은 양의 다라니 필사본이 남아 있어 통일신라시대에 유통되었던 무구정광다라니의 온전한 형태를 재구해 낼 수 있는 유일한 자료이다. 이에 본고는 화엄사 다라니에서 같은 다라니를 필사한 지편을 모두 모아 서로 비교하여 글자가 누락되거나 추가된 경우, 다른 글자로 잘못 쓴 경우 등의 필사 오류를 변별해 낸 후, 화엄사 다라니의 필사 저본을 온전히 재구해보았다. 화엄사 다라니의 필사 저본 재구를 통해 통일신라시대에 유통되었던 무구정광다라니의 온전한 형태가 재구된 셈이다. 재구된 화엄사 다라니의 필사 저본을 현전하는 다른 무구정광다라니와 비교한 결과, 화엄사 다라니의 필사 저본이 석가탑 『무구정경』과 같은 계통이기는 하지만 동일본은 아니라는 사실을 알 수 있었다. 또 초기 사경과 대장경 계통의 차이가 드러나기도 하였다. 뿐만 아니라 석가탑 『무구정경』의 훼손 부분을 복원하는 데에 중요한 근거가 되었다. 이와 같은 본고의 논의를 바탕으로 화엄사 다라니의 필사 과정이나 통일신라시대 무구정경 관련 유물 간 시대의 선후 관계 등에 대해 학계에서 더 깊이 있는 논의가 이루어지길 기대한다. The Mugujeonggwang Dharani excavated from the West Stone Pagoda at Hwaeom-sa Temple is the only material which can reconstruct the intact form of the Mugujeonggwang Dharani distributed during the Unified Silla era, as the Dharani has the largest amount of transcriptions left. This paper, thus collected all transcription of the same Dharani from the Dharani of Hwaeom-sa Temple and compared them to distinguish transcription errors, such as missing, added or replaced letters, and aimed on reconstructing the entire transcribed manuscript of the Dharani found at Hwaeom-sa Temple. This reconstruction of the transcription of the Dharani of Hwaeom-sa, in effect, is a reconsruction of the intact form of the Mugujeonggwang Dharani distributed during the Unified Silla era. A comparison of the reconstructed Dharani of Hwaeom-sa Temple and other existing Mugujeonggwang Dharanis showed that while the original manuscript of the Dharani of Hwaeom-sa Temple may share its stems with the Mugujeonggyeong found in Seokgatab, it is not identical to it. Moreover, the reconstructed transcription served as an important evidence for reconstructing the damaged parts of the Mugujeonggyeong of Seokgatab. The findings of this study will hopefully become a basis for more in-depth academic discussions on the transcription process of the Dharani of Hwaeom-sa or the historical order between the artifacts related to the Mugujeonggyeong during the Unified Silla era.

An Inquiry into Korean Students’ Learning Experiences Related to the ESL Curriculum in the United States

정경옥 한국중앙영어영문학회 2007 영어영문학연구 Vol.49 No.1

 Abstract An Inquiry into Korean Students’ Learning Experiences Related to the ESL Curriculum in the United States Jeong, Kyeong-Ouk (Pai Chai University) The number of Korean students who are studying in English speaking countries is increasing and the expenditure invested for studying English abroad is enormous. However, the quality of some ESL programs is not always satisfactory. Recently, there has been a lot of criticism that ESL programs are often not beneficial to language minority students. Some ESL programs cannot provide appropriate instruction and assistance. As a result, it becomes much harder for students to compete with their American peers. In this paper, the researcher scrutinizes some issues related to ESL programs in the United States and Korean students’ ESL experience in American schools. It is examined how the students undergo identity crisis and how they are disadvantaged due to curricular materials irrelevant to their academic needs and interests. Then, this paper proposes some suggestions that can benefit Korean ESL students in their struggles to learn English in America. The researcher hopes this study can help ESL teachers treat their students with more insight about their cultural backgrounds and literacy experiences. The researcher also hopes that this study can help Korean professionals in English education offer more appropriate and reliable advice for their students studying abroad to improve English.

미숙아망막병증이 없는 미숙아에서 RETevalTM을 이용한 망막전위도 평가

정경도,박재용,박지민,김재석,최 진,황제형 한국망막학회 2022 Journal of Retina Vol.7 No.2

Purpose: This study was to conducted to evaluate the usefulness of light adapted electroretinography (ERG) using the RETevalTM system (LKC Technologies, Gaithersburg, MD, USA) in preterm infants without retinopathy of prematurity. Methods: Overall, 18 preterm infants underwent light adapted ERG using the RETevalTM system without sedation. Readable results were acquired from 11 patients (61%) and the mean gestational age at birth was 33 ± 3 weeks. Results: The amplitude and implicit time of the ‘a’ wave was -8.1 ± 6.6 μV and 17.3 ± 7.8 ms, respectively, while those of the ‘b’ wave was 20.4 ± 13.6 μV and 36.7 ± 8.8 ms, respectively. Additionally, 30-Hz flicker results were obtained with an amplitude and implicit time of 6.0 ± 3.8 μV and 32.3 ± 2.8 ms, respectively. Negative correlation was found between the ‘a’ wave amplitude and age at examination (p < 0.05). The light-adapted 3.0 ERG response was decreased in preterm infants and a larger decrease in ‘b’ wave amplitude than ‘a’ wave amplitude was observed, which corresponds to the histological maturation of the retina. Conclusions: Our study indicates that RETevalTM system is useful for evaluating retinal function in preterm infants.

T. S. Eliot’s Poems of Satire Written in the 1910s: Transition in the Narrative Structure

정경심 한국현대영미시학회 2010 현대영미시연구 Vol.16 No.1

We tend to think Eliot’s satirical poems were written along with his interest in Gautier and followed the dramatic monologues. However, Eliot’s experimentation with satire, his use of satirical tone and understatement on narrative stance, had started much earlier. In “Preludes” and other shorter poems written before 1915 he had already portrayed the so-called omniscient “I” as a distanced narrator, started to zoom out his narrative angles, and brought satirical strains to the poem by suddenly subjecting the narrator to an irony. In the quatrain poems Eliot further experimented and extended narrative scope further. As the narrative scope turns more comprehensive, the major tools to keep satirical strains are the personal pronouns: the first and the second persons are drastically reduced, and “they” as the collective mass dominates, telescoped under the satirical eyes. After the quatrain poems, Eliot returns to the earlier “I,” resuming the old effort to bridge “I” with the collective “they.” Just as the foundation of his satire was the partial sympathy Prufrock’s “I” has reached, so the foundation of new sympathy is the “I” narrator’s and “their” limitedness in perspective. Eliot’s satirical poems in the 1910s are transitional in restructuring the narrative stance, which prepares for the new fusion.