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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.
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.
정재우(Jeong Jae-Woo),이영수(Lee Young-Soo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The current Korea society, same as other advanced countries, has become a more aging society. The aging society will be a trend-actually it is a trend now, and be spreaded more in future. Since the number of aged people is dramatically increased, related facilities, such as special hospitals for the aged people, are needed more than any other times. In addition, the aging society has become urbanization. Different from the past years (when someone retires, he/she usually goes down to their hometowns which are suburban areas.), less aged people go down to the suburban areas; and more aged people stay in urban areas. Therefore, in my thesis, I will describe my research on a special hospital for aged people in urban area. Based on the research, I will design more suitable hospital for aged people in urban area.
Temporal logic을 이용한 concurrent system의 modeling과 자동 검증에 관한 연구
정재우(Jae Woo Jeong),최영근(Young Keun Choi) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.2
본 논문에서는 temporal logic을 이용하여 concurrent system의 행위를 기술한 사양(specification)들로 부터 상태 전이 그래프 모델(finite state transition model)을 구성한다. 또한 이 모델을 이용하여 concurrent system들이 만족해야 하는 특성들, 즉 termination, partial correctness, deadlock free, mutual exclusion등과 같은 liveness 및 safety에 관한 여러 특성을 자동 검증할 수 있는 시스템을 구현하는 데 목적이 있다.
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.