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P-N junction Photodiode from IGZO/p-Si Heterostructure
Yeri Heo,Gunhoo Woo,Donghyeon Lee,Won Jae Lee,Taesung Kim,Hocheon Yoo 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
P-N junction heterostructure photodiodes obtained by combing different energy bandgap structures materials provide promising photo-sensing behaviors. Here, we demonstrated an indium gallium zinc oxide (IGZO)/p-Si heterostructure photodiode which shows clear difference along to light intensity and wavelength without gate. Through this study, we obtained a gateless photo-sensing behavior according to wavelength of light. As a result, we obtained considerably a high on/off current ratio as high as 52.71 A/A.
Yeri Jeong,Sanggu Kang,Boeun Kim,Yong Jin Gil,Seung-sik Hwang,Sung-il Cho The Korean Society for Preventive Medicine 2023 예방의학회지 Vol.56 No.4
Objectives: Korea and Japan have managed the spread of coronavirus disease 2019 (COVID-19) using markedly different policies, referred to as the "3T" and "3C" strategies, respectively. This study examined these differences to assess the roles of active testing and contact tracing as non-pharmaceutical interventions (NPIs). We compared the proportion of unlinked cases (UCs) and test positivity rate (TPR) as indicators of tracing and testing capacities. Methods: We outlined the evolution of NPI policies and investigated temporal trends in their correlations with UCs, confirmed cases, and TPR prior to the Omicron peak. Spearman correlation coefficients were reported between the proportion of UCs, confirmed cases, and TPR. The Fisher r-to-z transformation was employed to examine the significance of differences between correlation coefficients. Results: The proportion of UCs was significantly correlated with confirmed cases (r=0.995, p<0.001) and TPR (r=0.659, p<0.001) in Korea and with confirmed cases (r=0.437, p<0.001) and TPR (r=0.429, p<0.001) in Japan. The Fisher r-to-z test revealed significant differences in correlation coefficients between the proportion of UCs and confirmed cases (z=16.07, p<0.001) and between the proportion of UCs and TPR (z=2.12, p=0.034) in Korea and Japan. Conclusions: Higher UCs were associated with increases in confirmed cases and TPR, indicating the importance of combining testing and contact tracing in controlling COVID-19. The implementation of stricter policies led to stronger correlations between these indicators. The proportion of UCs and TPR effectively indicated the effectiveness of NPIs. If the proportion of UCs shows an upward trend, more testing and contact tracing may be required.