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나노크기 표면 요철을 이용한 GaN LED의 광추출효율 향상
정재우,김사라,정준호,정종율,Jung, Jae-Woo,Kim, Sarah,Jeong, Jun Ho,Jeong, Jong-Ryul 한국재료학회 2012 한국재료학회지 Vol.22 No.11
In this study, we have investigated highly efficient nanoscale surface corrugated light emitting diodes (LEDs) for the enhancement of light extraction efficiency (LEE) of nitride semiconductor LEDs. Nanoscale indium tin oxide (ITO) surface corrugations are fabricated by using the conformal nanoimprint technique; it was possible to observe an enhancement of LEE for the ITO surface corrugated LEDs. By incorporating this novel method, we determined that the total output power of the surface corrugated LEDs were enhanced by 45.6% for patterned sapphire substrate LEDs and by 41.9% for flat c-plane substrate LEDs. The enhancement of LEE through nanoscale surface corrugations was studied using 3-dimensional Finite Different Time Domain (FDTD) calculation. From the FDTD calculations, we were able to separate the light extraction from the top and bottom sides of device. This process revealed that light extraction from the top and bottom sides of a device strongly depends on the substrate and the surface corrugation. We found that enhanced LEE could be understood through the mechanism of enhanced light transmission due to refractive index matching and the increase of light scattering from the corrugated surface. LEE calculations for the encapsulated LEDs devices also revealed that low LEE enhancement is expected after encapsulation due to the reduction of the refractive index contrast.
정재우(Jae-woo Jeong),민병훈(Byung-hoon Min),이동희(Dong-hee Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Durability problems regarding shock absorbers are chronic problems of vehicles for which countermeasures are in dire need. Current investigation reviews various parameters that affect the durability of shock absorbers and aim to suggest design guideline to improve the issue. Test method attempted to enhance reproducibility by comparing field claim parts, parts resulting from accelerated durability testing at proving ground and parts from single component (item) durability testing is also introduced together.
정재우(Jae Woo Jeong) 횃불트리니티신학대학원대학교 한국이슬람연구소 2021 Muslim - Christian Encounter Vol.14 No.2
이 논문은 역사적 선교적 관점에서 말레이시아의 화교와 말레이의 관계를 다루고 있다. 근대 말레이시아는 영국, 화교, 그리고 말레이와의 정치적, 경제적, 종교적으로 복잡한 상호관계를 통해서 서로의 이익을 추구하면서 형성이 되었다. 화교들의 경제적, 정치적 영향력의 확산은 다른 민족, 특히 말레이들의 반발을 일으키고 있다. 다민족 국가인 말레이시아는 건국 이후 하나된 말레이시아를 표방하며 민족 간의 분열을 해소하기 위해 노력해 오고 있지 만“5/13 사태”와 “신경제정책” 그리고 일련의 종교 분쟁으로 화교와 말레이 민족 간의 갈등은 계속되었다. 특히 코로나 이후 정부의 친 이슬람 정책으로 갈등의 골은 더욱 심화되는 양상이다. 그간 화교 기독교인들은 중국계나 원주민 같은 비 말레이 사역에 치중을 하였다. 화교 기독인들은 불편한 관계에 있는 말레이와 좋은 이웃이 되어야 하며 화교교회들은 공공신학을 기반으로 보다 적극적으로 국가와 사회의 공익에 관심을 가지고 영향력을 행사해야 한다. This article explores the relationship between the Chinese and Malays in Malaysia from a historical and missiological perspective. Modern Malaysia was formed through the complex interrelations among Britain, the Chinese, and the Malays and their respective pursuit of political, economic, and religious interests. The spread of Chinese economic and political influence has been causing backlash from other ethnic groups, especially the Malays. Since its foundation, Malaysia, a multi-ethnic country, has been advocating unity and striving to remove division, but conflict between Chinese and Malay ethnic groups are ongoing due to the May 13 Incident, New Economic Policy, and a series of religious disputes. In particular, the government’s pro-Islamic policy since the COVID-19 pandemic is intensifying tensions, as with the case of Ebit Lew. Chinese Christians have mainly been evangelizing non Malay people in Malaysia. Now they need to become good neighbors with Malays. In addition, Chinese churches should be more actively involved in the interests of the state and society, based on Public Theology.
COMMUNICATING WITH MUSLIMS: THE HUI IN CHINA
정재우(Jae Woo Jeong) 횃불트리니티신학대학원대학교 한국이슬람연구소 2020 Muslim - Christian Encounter Vol.13 No.1
Earlier Christian response to Islam was essentially polemic and defensive. Christian workers from the West did not understand the local culture and people, delivering the Christian message to Muslims without contextualization methods such as the inference model in communication. As such, there is a need to change the manner of communication from a source-oriented to a person and context-oriented method in which communicators and recipients can truly understand. This article examines effective communication with the Hui, a Muslim people group, who are resistant to the gospel, by employing two methodological perspectives: communication theories and the Hui in China. This study strives to approach the human elements beneath the surface level of Islam. Understanding the Hui’s culture and people and meeting their felt needs in order to open the lines of communication are the appropriate methods for mission among the Hui in China.