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Characterization of MBE-Grown ZnSe Thin Films by Using Photocurrent Spectroscopy
Myunghoon Jung,Jiho Chang,Dongcheol Oh,고항주,Hongseung Kim,Junsuk Song,Kwanghee Kim,Seunghwan Park,Takafumi Yao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
High-quality ZnSe thin films were grown on GaAs substrates by using molecular beam epitaxy (MBE). Low-temperature and temperature-dependent photoluminescence (PL) measurements revealed the high crystal quality of the sample. However, photocurrent spectroscopy showed the existence of defects originating from the interface. Insertion of a buffer layer at a low growth temperature is suggested for improving the crystallinity further.
Monetary Policy Shocks and Exchange Rate Changes in Korea
Jung, Heonyong,Han, Myunghoon The International Promotion Agency of Culture Tech 2019 International Journal of Advanced Culture Technolo Vol.7 No.1
This paper examines whether the exchange rate respond differently to monetary policy shocks in Korea using regression model. We find an asymmetric response of the monetary policy shocks to the monetary policy shocks in the context of Korea. Over the whole period sample, we do not find the effect of an actual interest rate on exchange rate. But we find that the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant. In the period of monetary policy easing, the estimated coefficient on the expected and unexpected change in the policy rate are negative but not statistically significant. In contrast, the period of monetary policy tightening, the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant.
Monetary Policy Shocks and Exchange Rate Changes in Korea
Heonyong Jung,Myunghoon Han 국제문화기술진흥원 2019 International Journal of Advanced Culture Technolo Vol.7 No.1
This paper examines whether the exchange rate respond differently to monetary policy shocks in Korea using regression model. We find an asymmetric response of the monetary policy shocks to the monetary policy shocks in the context of Korea. Over the whole period sample, we do not find the effect of an actual interest rate on exchange rate. But we find that the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant. In the period of monetary policy easing, the estimated coefficient on the expected and unexpected change in the policy rate are negative but not statistically significant. In contrast, the period of monetary policy tightening, the estimated coefficient on the expected and unexpected change in the policy rate are negative and statistically significant.
Kang, Daesung,Jung, Myunghoon,Choi, Eunsil,Song, Kiyoung,Jeong, Hwanhee,Song, June-O,Kim, Da-Som,Kim, Sun-Kyung,Seong, Tae-Yeon The Electrochemical Society 2016 ECS journal of solid state science and technology Vol.5 No.2
<P>We investigated the effects of in situ GaN and sputtered AlN nucleation layers on the output power of GaN-based blue (445 nm) LEDs on patterned sapphire substrate (PSS) and planar sapphire substrates. Both the PSS LEDs and planar LEDs showed the same operation voltages, but the LEDs with the AlN layer had much lower reverse leakage current at -15 V. The LEDs with the AlN layer showed higher external quantum efficiency (EQE) at low current regions than those with the GaN nucleation layer. However, the AlN nucleation layer LEDs experienced a little more severe efficiency droop than did the GaN layer LEDs. It was shown that the AlN nucleation layer samples contained fewer defects than the GaN nucleation layer samples. The Raman spectral results showed that the AlN nucleation layer samples experienced higher compressive stress than the GaN nucleation layer samples. Simulation results also showed that both the AlN nucleation layer and air voids in the GaN nucleation layer samples hardly affected the light extraction efficiency. Based on the electrical, X-ray diffraction (XRD), cathodoluminescence (CL), and Raman results, the electrical behavior of the PSS and planar LEDs are described and discussed. (C) The Author(s) 2015. Published by ECS.All rights reserved.</P>
Eun-Ho Yu,Myunghoon Moon,Ji-Hong Min,Hye-Kyung Kim,신용일,고현윤,So Jung Kim,고성화 대한연하장애학회 2020 대한연하장애학회지 Vol.10 No.1
Objective: This study examined the correlation between dysarthria and aspiration to determine if dysarthria canpredict aspiration in stroke patients. Methods: The medical records of 176 patients with first stroke, who underwent a videofluoroscopic swallowing study(VFSS) and Urimal test of articulation and phonology (U-TAP) at the same time between January 2012 and December2015 in the authors’ hospital, were reviewed retrospectively. The correlation between the penetration aspirationscale (PAS) score and U-TAP score was analyzed in all patients. The mean PAS score and frequency of each PAS scorein the dysarthria group and non-dysarthria group were compared. In addition, the aspiration was analyzed based onthe severity of dysarthria in the dysphagia group. All statistical analyses were performed using SPSS software. Results: The correlation between the PAS score and U-TAP score was not statistically significant in all the subjects. The mean PAS score was 3.46±5.52 and 3.07±5.49 in the dysphagia and non-dysphagia group, respectively. The meanPAS score of the dysphagia group was higher than that of the non-dysphagia group. On the other hand, it was notstatistically significant. In addition, there was no significant difference in the frequency of the PAS scores betweenthe two groups. The aspiration was compared with the severity of dysarthria according to the U-TAP score; therewas no statistically significant difference. Conclusion: No correlation was observed between dysarthria and aspiration in stroke patients. In addition, there wasno difference in the frequency of aspiration with or without dysarthria. According to the results of this study, aspirationcannot be predicted by dysarthria in stroke patients. Therefore, each diagnostic test and assessment shouldbe performed for each symptom.
Kim, Joonhui,Choi, MyungHoon,Jung, Goo-Eun,Ferhan, Abdul Rahim,Cho, Nam-Joon,Cho, Sang-Joon Institute of Pure and Applied Physics 2016 Japanese Journal of Applied Physics Vol. No.
<P>The range of scanning probe microscopy (SPM) applications for atomic force microscopy (AFM) is expanding in the biological sciences field, reflecting an increasing demand for tools that can improve our fundamental understanding of the physics behind biological systems. However, the complexity associated with applying SPM techniques in biomedical research hampers the full exploitation of its capabilities. Recently, the development of scanning ion conductance microscopy (SICM) has overcome these limitations and enabled contact-free, high resolution imaging of live biological specimens. In this work, we demonstrate the limitation of AFM for imaging biological samples in liquid due to artifacts arising from AFM tip-sample interaction, and how SICM imaging is able to overcome those limitations with contact-free scanning. We also demonstrate that SICM measurements, when compared to AFM, show better fit to the actual dimensions of the biological samples. Our results highlight the superiority of SICM imaging, enabling it to be widely adopted as a general and versatile research tool for biological studies in the nanoscale. (C) 2016 The Japan Society of Applied Physics</P>