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Quenching effect of the exciton emission induced by an electric field in needle-like CdS rods
Hyeoncheol Kim,T.S. Jeong,T. S. Kim 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
In this paper, we studied the influence of electric fields on the exciton emissions of the needle-shaped CdS rod by using thecombined photocurrent/photoluminescence (PC/PL) spectroscopies. We observed that the exciton emission strongly dependedon the electric field while the defect-related emission weakly depended on the electric field. Intensity quenching and peak-shifteffects of the exciton spectrum were observed as the electric field increased. To explain these effects, combined PC/PLmeasurements were introduced and they showed that excitons readily interact with the PC carriers of the photocreatedelectrons and holes. This interaction reduced the number of carriers participating in recombination, and the cause of theintensity decrease was attributed to the reduced recombination of free excitons. Thus, the shift of the exciton peaks was relatedto Stark effect induced by electric field. Consequently, we extracted out that exciton–electron scattering in emission spectrawere the result of an interaction induced by the external electric field.
Raman Spectroscopy and Photocurrent of GaAsN/GaAs Multiple Quantum Wells
Hyeoncheol Kim,Kyu-Hwan Shim,Tae Soo Jeong,Sukill Kang,Taek Sung Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
The Raman and photocurrent of the GaAsN/GaAs multiple quantum wells (MQWs) was studied. The Raman spectra areobserved to be dominated by the GaAs longitudinal optical (LO) phonon mode as the strongest peaks show up around287–292 cm -1 . Moreover, the weak and broad spectral features in the range of 265–270 cm -1 originate from the peaks associatedwith the GaAs transverse optical (TO) phonon mode. And, the peaks observed in the photoluminescence and thephotocurrent spectra were preliminarily assigned to electron–heavy hole (e 1 –hh) and electron–light hole (e 1 –lh) fundamentaltransitions. Two additional transitions related to MQWs region are observed other than transitions involving the ground state. The structural properties of GaAsN/GaAs MQWs were investigated by using high-resolution X-ray diff raction (HRXRD).
초해상도 모델 경량화를 위한 특징 영역에서의 대조 손실 기반 지식 증류 기법
문현철(HyeonCheol Moon),김명균(MyeongKyun Kim),정진우(JinWoo Jeong),김성제(SungJei Kim) 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2
CNN 의 등장으로 단일 이미지 초해상도 분야에서 뛰어난 성능을 보여주고 있으나, 성능이 높아짐에 따라 모델의 복잡도가 크게 증가하였다. 이에 모바일 및 엣지 디바이스 같은 저전력 디바이스에 인공신경망 모델이 추론되기 위해서는 모델의 경량화의 필요성이 증가하고 있다. 본 논문에서는 초해상도 모델 중 하나인 EDSR(Enhanced Deep Residual Network)에 특징 영역에서의 대조 손실기반 지식 증류를 적용한 모델 경량화 기법을 제안한다. 실험 결과 제안한 지식 증류 기법이 기존의 다른 특징 영역에서의 지식 증류 기법보다 성능이 향상되는 것을 확인하였다.
Kim, Kyungsun,Jeong, Hyeoncheol korean Academy of Physical Therapy Rehabilitation 2020 Physical therapy rehabilitation science Vol.9 No.4
Objective: The reason why it is important to look at the benefits of exercise-music experience perceived by the elderly is that the satisfaction of life in old age is a meaningful reflection of the subjective perception of the life of the elderly. This is because it must be understood as the center. Design: A qualitative study. Methods: Participants are senior citizens attending senior citizens' college located in Eumseong city. Those who have taken an exercise-music song program for at least one semester served as the participants. Individual interviews were conducted by selecting 10 people through purposeful sampling. The collected data were analyzed by applying Colaizzi's method among phenomenological methods. The exercise-music program was conducted for 12 weeks, for a total of 50 minutes for each time (10 minutes for introduction, 35 minutes for music, 5 minutes for finishing). Results: As a result of the study, the experience of the exercise-music program was derived into 6 categories and 13 subjects. These 6 main categories are 'Changes from the developmental crisis', 'Freedom from the confines of others', 'Positive emotions found through songs', 'Feeling of peer and fellowship relationships', 'Changes in self-awareness', It appeared as a 'Change in the way of life'. Conclusions: In conclusion, the experience of the exercise-music program brought about a positive changes in life of doing one's best by improving confidence and confirming presence. Therefore, this study suggests activation of senior college programs to find a sense of presence for each level by using exercise-music programs with good accessibility.
디지털교과서 링크드 오픈 데이터(Linked Open Data) 구축 모델 연구
정의석 ( Euisuk Jeong ),김현철 ( Hyeoncheol Kim ) 한국컴퓨터교육학회 2016 한국컴퓨터교육학회 학술발표대회논문집 Vol.20 No.2
현재의 디지털교과서는 교과 간, 출처 간 교육 자원들이 서로 단절되어 관련 교육 자원의 통합 제공에많은 제약점이 존재하고 있다. 링크드데이터 기술을 이용해 디지털교과서 자원들을 의미적으로 연결해 제공해 줌으로써 학습자는 문제를 보다 종합적인 관점에서 보게 되고 복잡한 문제를 이해하고 창의적인 해결 방안을 창출할 수 있다. 본 논문에서는 시멘틱 웹 기술 기반한 디지털교과서 링크드 오픈 데이터 구축 모델을설계하였다.